Add patches for v6.4

Derived from latest v6.3 patches. No functional changes.

Links:
 - kernel: https://github.com/linux-surface/kernel/commit/55b2108daafc94083ee73333390f3e118c3baa6b
 - tree-devel: https://github.com/linux-surface/kernel/tree/v6.4-surface-devel
 - tree-patches: https://github.com/linux-surface/kernel/tree/v6.4-surface

configs/surface-6.4.config

@@ -0,0 +1,77 @@
+##
+## Surface Aggregator Module
+##
+CONFIG_SURFACE_AGGREGATOR=m
+# CONFIG_SURFACE_AGGREGATOR_ERROR_INJECTION is not set
+CONFIG_SURFACE_AGGREGATOR_BUS=y
+CONFIG_SURFACE_AGGREGATOR_CDEV=m
+CONFIG_SURFACE_AGGREGATOR_HUB=m
+CONFIG_SURFACE_AGGREGATOR_REGISTRY=m
+CONFIG_SURFACE_AGGREGATOR_TABLET_SWITCH=m
+
+CONFIG_SURFACE_ACPI_NOTIFY=m
+CONFIG_SURFACE_DTX=m
+CONFIG_SURFACE_PLATFORM_PROFILE=m
+
+CONFIG_SURFACE_HID=m
+CONFIG_SURFACE_KBD=m
+
+CONFIG_BATTERY_SURFACE=m
+CONFIG_CHARGER_SURFACE=m
+
+##
+## Surface Hotplug
+##
+CONFIG_SURFACE_HOTPLUG=m
+
+##
+## IPTS and ITHC touchscreen
+##
+## This only enables the user interface for IPTS/ITHC data.
+## For the touchscreen to work, you need to install iptsd.
+##
+CONFIG_HID_IPTS=m
+CONFIG_HID_ITHC=m
+
+##
+## Cameras: IPU3
+##
+CONFIG_VIDEO_DW9719=m
+CONFIG_VIDEO_IPU3_IMGU=m
+CONFIG_VIDEO_IPU3_CIO2=m
+CONFIG_CIO2_BRIDGE=y
+CONFIG_INTEL_SKL_INT3472=m
+CONFIG_REGULATOR_TPS68470=m
+CONFIG_COMMON_CLK_TPS68470=m
+CONFIG_LEDS_TPS68470=m
+
+##
+## Cameras: Sensor drivers
+##
+CONFIG_VIDEO_OV5693=m
+CONFIG_VIDEO_OV7251=m
+CONFIG_VIDEO_OV8865=m
+
+##
+## Surface 3: atomisp causes problems (see issue #1095). Disable it for now.
+##
+# CONFIG_INTEL_ATOMISP is not set
+
+##
+## ALS Sensor for Surface Book 3, Surface Laptop 3, Surface Pro 7
+##
+CONFIG_APDS9960=m
+
+##
+## For Intel Thread Director (Alder-Lake)
+##
+CONFIG_IPC_CLASSES=y
+
+##
+## Other Drivers
+##
+CONFIG_INPUT_SOC_BUTTON_ARRAY=m
+CONFIG_SURFACE_3_POWER_OPREGION=m
+CONFIG_SURFACE_PRO3_BUTTON=m
+CONFIG_SURFACE_GPE=m
+CONFIG_SURFACE_BOOK1_DGPU_SWITCH=m

patches/6.4/0001-surface3-oemb.patch

@@ -0,0 +1,101 @@
+From 5e58b7ceec0d77a42fd35878e419e77a930e8dbf Mon Sep 17 00:00:00 2001
+From: Tsuchiya Yuto <kitakar@gmail.com>
+Date: Sun, 18 Oct 2020 16:42:44 +0900
+Subject: [PATCH] (surface3-oemb) add DMI matches for Surface 3 with broken DMI
+ table
+
+On some Surface 3, the DMI table gets corrupted for unknown reasons
+and breaks existing DMI matching used for device-specific quirks.
+
+This commit adds the (broken) DMI data into dmi_system_id tables used
+for quirks so that each driver can enable quirks even on the affected
+systems.
+
+On affected systems, DMI data will look like this:
+    $ grep . /sys/devices/virtual/dmi/id/{bios_vendor,board_name,board_vendor,\
+    chassis_vendor,product_name,sys_vendor}
+    /sys/devices/virtual/dmi/id/bios_vendor:American Megatrends Inc.
+    /sys/devices/virtual/dmi/id/board_name:OEMB
+    /sys/devices/virtual/dmi/id/board_vendor:OEMB
+    /sys/devices/virtual/dmi/id/chassis_vendor:OEMB
+    /sys/devices/virtual/dmi/id/product_name:OEMB
+    /sys/devices/virtual/dmi/id/sys_vendor:OEMB
+
+Expected:
+    $ grep . /sys/devices/virtual/dmi/id/{bios_vendor,board_name,board_vendor,\
+    chassis_vendor,product_name,sys_vendor}
+    /sys/devices/virtual/dmi/id/bios_vendor:American Megatrends Inc.
+    /sys/devices/virtual/dmi/id/board_name:Surface 3
+    /sys/devices/virtual/dmi/id/board_vendor:Microsoft Corporation
+    /sys/devices/virtual/dmi/id/chassis_vendor:Microsoft Corporation
+    /sys/devices/virtual/dmi/id/product_name:Surface 3
+    /sys/devices/virtual/dmi/id/sys_vendor:Microsoft Corporation
+
+Signed-off-by: Tsuchiya Yuto <kitakar@gmail.com>
+Patchset: surface3-oemb
+---
+ drivers/platform/surface/surface3-wmi.c           | 7 +++++++
+ sound/soc/codecs/rt5645.c                         | 9 +++++++++
+ sound/soc/intel/common/soc-acpi-intel-cht-match.c | 8 ++++++++
+ 3 files changed, 24 insertions(+)
+
+diff --git a/drivers/platform/surface/surface3-wmi.c b/drivers/platform/surface/surface3-wmi.c
+index ca4602bcc7de..490b9731068a 100644
+--- a/drivers/platform/surface/surface3-wmi.c
++++ b/drivers/platform/surface/surface3-wmi.c
+@@ -37,6 +37,13 @@ static const struct dmi_system_id surface3_dmi_table[] = {
+ 			DMI_MATCH(DMI_PRODUCT_NAME, "Surface 3"),
+ 		},
+ 	},
++	{
++		.matches = {
++			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
++			DMI_MATCH(DMI_SYS_VENDOR, "OEMB"),
++			DMI_MATCH(DMI_PRODUCT_NAME, "OEMB"),
++		},
++	},
+ #endif
+ 	{ }
+ };
+diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c
+index 7c7cbb6362ea..81a8ff40e86e 100644
+--- a/sound/soc/codecs/rt5645.c
++++ b/sound/soc/codecs/rt5645.c
+@@ -3717,6 +3717,15 @@ static const struct dmi_system_id dmi_platform_data[] = {
+ 		},
+ 		.driver_data = (void *)&intel_braswell_platform_data,
+ 	},
++	{
++		.ident = "Microsoft Surface 3",
++		.matches = {
++			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
++			DMI_MATCH(DMI_SYS_VENDOR, "OEMB"),
++			DMI_MATCH(DMI_PRODUCT_NAME, "OEMB"),
++		},
++		.driver_data = (void *)&intel_braswell_platform_data,
++	},
+ 	{
+ 		/*
+ 		 * Match for the GPDwin which unfortunately uses somewhat
+diff --git a/sound/soc/intel/common/soc-acpi-intel-cht-match.c b/sound/soc/intel/common/soc-acpi-intel-cht-match.c
+index cdcbf04b8832..958305779b12 100644
+--- a/sound/soc/intel/common/soc-acpi-intel-cht-match.c
++++ b/sound/soc/intel/common/soc-acpi-intel-cht-match.c
+@@ -27,6 +27,14 @@ static const struct dmi_system_id cht_table[] = {
+ 			DMI_MATCH(DMI_PRODUCT_NAME, "Surface 3"),
+ 		},
+ 	},
++	{
++		.callback = cht_surface_quirk_cb,
++		.matches = {
++			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
++			DMI_MATCH(DMI_SYS_VENDOR, "OEMB"),
++			DMI_MATCH(DMI_PRODUCT_NAME, "OEMB"),
++		},
++	},
+ 	{ }
+ };
+ 
+-- 
+2.41.0
+

patches/6.4/0002-mwifiex.patch

@@ -0,0 +1,400 @@
+From c22ce98320199831b7c142f943f51323c9127a1f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jonas=20Dre=C3=9Fler?= <verdre@v0yd.nl>
+Date: Tue, 3 Nov 2020 13:28:04 +0100
+Subject: [PATCH] mwifiex: Add quirk resetting the PCI bridge on MS Surface
+ devices
+
+The most recent firmware of the 88W8897 card reports a hardcoded LTR
+value to the system during initialization, probably as an (unsuccessful)
+attempt of the developers to fix firmware crashes. This LTR value
+prevents most of the Microsoft Surface devices from entering deep
+powersaving states (either platform C-State 10 or S0ix state), because
+the exit latency of that state would be higher than what the card can
+tolerate.
+
+Turns out the card works just the same (including the firmware crashes)
+no matter if that hardcoded LTR value is reported or not, so it's kind
+of useless and only prevents us from saving power.
+
+To get rid of those hardcoded LTR reports, it's possible to reset the
+PCI bridge device after initializing the cards firmware. I'm not exactly
+sure why that works, maybe the power management subsystem of the PCH
+resets its stored LTR values when doing a function level reset of the
+bridge device. Doing the reset once after starting the wifi firmware
+works very well, probably because the firmware only reports that LTR
+value a single time during firmware startup.
+
+Patchset: mwifiex
+---
+ drivers/net/wireless/marvell/mwifiex/pcie.c   | 12 +++++++++
+ .../wireless/marvell/mwifiex/pcie_quirks.c    | 26 +++++++++++++------
+ .../wireless/marvell/mwifiex/pcie_quirks.h    |  1 +
+ 3 files changed, 31 insertions(+), 8 deletions(-)
+
+diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
+index 9a698a16a8f3..14687342bc81 100644
+--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
++++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
+@@ -1762,9 +1762,21 @@ mwifiex_pcie_send_boot_cmd(struct mwifiex_adapter *adapter, struct sk_buff *skb)
+ static int mwifiex_pcie_init_fw_port(struct mwifiex_adapter *adapter)
+ {
+ 	struct pcie_service_card *card = adapter->card;
++	struct pci_dev *pdev = card->dev;
++	struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
+ 	const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
+ 	int tx_wrap = card->txbd_wrptr & reg->tx_wrap_mask;
+ 
++	/* Trigger a function level reset of the PCI bridge device, this makes
++	 * the firmware of PCIe 88W8897 cards stop reporting a fixed LTR value
++	 * that prevents the system from entering package C10 and S0ix powersaving
++	 * states.
++	 * We need to do it here because it must happen after firmware
++	 * initialization and this function is called after that is done.
++	 */
++	if (card->quirks & QUIRK_DO_FLR_ON_BRIDGE)
++		pci_reset_function(parent_pdev);
++
+ 	/* Write the RX ring read pointer in to reg->rx_rdptr */
+ 	if (mwifiex_write_reg(adapter, reg->rx_rdptr, card->rxbd_rdptr |
+ 			      tx_wrap)) {
+diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
+index dd6d21f1dbfd..f46b06f8d643 100644
+--- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
++++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
+@@ -13,7 +13,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{
+ 		.ident = "Surface Pro 5",
+@@ -22,7 +23,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{
+ 		.ident = "Surface Pro 5 (LTE)",
+@@ -31,7 +33,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{
+ 		.ident = "Surface Pro 6",
+@@ -39,7 +42,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{
+ 		.ident = "Surface Book 1",
+@@ -47,7 +51,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{
+ 		.ident = "Surface Book 2",
+@@ -55,7 +60,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{
+ 		.ident = "Surface Laptop 1",
+@@ -63,7 +69,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{
+ 		.ident = "Surface Laptop 2",
+@@ -71,7 +78,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"),
+ 		},
+-		.driver_data = (void *)QUIRK_FW_RST_D3COLD,
++		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
++					QUIRK_DO_FLR_ON_BRIDGE),
+ 	},
+ 	{}
+ };
+@@ -89,6 +97,8 @@ void mwifiex_initialize_quirks(struct pcie_service_card *card)
+ 		dev_info(&pdev->dev, "no quirks enabled\n");
+ 	if (card->quirks & QUIRK_FW_RST_D3COLD)
+ 		dev_info(&pdev->dev, "quirk reset_d3cold enabled\n");
++	if (card->quirks & QUIRK_DO_FLR_ON_BRIDGE)
++		dev_info(&pdev->dev, "quirk do_flr_on_bridge enabled\n");
+ }
+ 
+ static void mwifiex_pcie_set_power_d3cold(struct pci_dev *pdev)
+diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h
+index d6ff964aec5b..5d30ae39d65e 100644
+--- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h
++++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h
+@@ -4,6 +4,7 @@
+ #include "pcie.h"
+ 
+ #define QUIRK_FW_RST_D3COLD	BIT(0)
++#define QUIRK_DO_FLR_ON_BRIDGE	BIT(1)
+ 
+ void mwifiex_initialize_quirks(struct pcie_service_card *card);
+ int mwifiex_pcie_reset_d3cold_quirk(struct pci_dev *pdev);
+-- 
+2.41.0
+
+From ed60891bbb1bd8b719c37e4d6798bdb89d359ed3 Mon Sep 17 00:00:00 2001
+From: Tsuchiya Yuto <kitakar@gmail.com>
+Date: Sun, 4 Oct 2020 00:11:49 +0900
+Subject: [PATCH] mwifiex: pcie: disable bridge_d3 for Surface gen4+
+
+Currently, mwifiex fw will crash after suspend on recent kernel series.
+On Windows, it seems that the root port of wifi will never enter D3 state
+(stay on D0 state). And on Linux, disabling the D3 state for the
+bridge fixes fw crashing after suspend.
+
+This commit disables the D3 state of root port on driver initialization
+and fixes fw crashing after suspend.
+
+Signed-off-by: Tsuchiya Yuto <kitakar@gmail.com>
+Patchset: mwifiex
+---
+ drivers/net/wireless/marvell/mwifiex/pcie.c   |  7 +++++
+ .../wireless/marvell/mwifiex/pcie_quirks.c    | 27 +++++++++++++------
+ .../wireless/marvell/mwifiex/pcie_quirks.h    |  1 +
+ 3 files changed, 27 insertions(+), 8 deletions(-)
+
+diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
+index 14687342bc81..5e1a341f63df 100644
+--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
++++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
+@@ -368,6 +368,7 @@ static int mwifiex_pcie_probe(struct pci_dev *pdev,
+ 					const struct pci_device_id *ent)
+ {
+ 	struct pcie_service_card *card;
++	struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
+ 	int ret;
+ 
+ 	pr_debug("info: vendor=0x%4.04X device=0x%4.04X rev=%d\n",
+@@ -409,6 +410,12 @@ static int mwifiex_pcie_probe(struct pci_dev *pdev,
+ 		return -1;
+ 	}
+ 
++	/* disable bridge_d3 for Surface gen4+ devices to fix fw crashing
++	 * after suspend
++	 */
++	if (card->quirks & QUIRK_NO_BRIDGE_D3)
++		parent_pdev->bridge_d3 = false;
++
+ 	return 0;
+ }
+ 
+diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
+index f46b06f8d643..99b024ecbade 100644
+--- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
++++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
+@@ -14,7 +14,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{
+ 		.ident = "Surface Pro 5",
+@@ -24,7 +25,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{
+ 		.ident = "Surface Pro 5 (LTE)",
+@@ -34,7 +36,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{
+ 		.ident = "Surface Pro 6",
+@@ -43,7 +46,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{
+ 		.ident = "Surface Book 1",
+@@ -52,7 +56,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{
+ 		.ident = "Surface Book 2",
+@@ -61,7 +66,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{
+ 		.ident = "Surface Laptop 1",
+@@ -70,7 +76,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{
+ 		.ident = "Surface Laptop 2",
+@@ -79,7 +86,8 @@ static const struct dmi_system_id mwifiex_quirk_table[] = {
+ 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"),
+ 		},
+ 		.driver_data = (void *)(QUIRK_FW_RST_D3COLD |
+-					QUIRK_DO_FLR_ON_BRIDGE),
++					QUIRK_DO_FLR_ON_BRIDGE |
++					QUIRK_NO_BRIDGE_D3),
+ 	},
+ 	{}
+ };
+@@ -99,6 +107,9 @@ void mwifiex_initialize_quirks(struct pcie_service_card *card)
+ 		dev_info(&pdev->dev, "quirk reset_d3cold enabled\n");
+ 	if (card->quirks & QUIRK_DO_FLR_ON_BRIDGE)
+ 		dev_info(&pdev->dev, "quirk do_flr_on_bridge enabled\n");
++	if (card->quirks & QUIRK_NO_BRIDGE_D3)
++		dev_info(&pdev->dev,
++			 "quirk no_brigde_d3 enabled\n");
+ }
+ 
+ static void mwifiex_pcie_set_power_d3cold(struct pci_dev *pdev)
+diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h
+index 5d30ae39d65e..c14eb56eb911 100644
+--- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h
++++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h
+@@ -5,6 +5,7 @@
+ 
+ #define QUIRK_FW_RST_D3COLD	BIT(0)
+ #define QUIRK_DO_FLR_ON_BRIDGE	BIT(1)
++#define QUIRK_NO_BRIDGE_D3	BIT(2)
+ 
+ void mwifiex_initialize_quirks(struct pcie_service_card *card);
+ int mwifiex_pcie_reset_d3cold_quirk(struct pci_dev *pdev);
+-- 
+2.41.0
+
+From d93a6c751f60fabf280f377732f7084635e1c1ee Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jonas=20Dre=C3=9Fler?= <verdre@v0yd.nl>
+Date: Thu, 25 Mar 2021 11:33:02 +0100
+Subject: [PATCH] Bluetooth: btusb: Lower passive lescan interval on Marvell
+ 88W8897
+
+The Marvell 88W8897 combined wifi and bluetooth card (pcie+usb version)
+is used in a lot of Microsoft Surface devices, and all those devices
+suffer from very low 2.4GHz wifi connection speeds while bluetooth is
+enabled. The reason for that is that the default passive scanning
+interval for Bluetooth Low Energy devices is quite high in Linux
+(interval of 60 msec and scan window of 30 msec, see hci_core.c), and
+the Marvell chip is known for its bad bt+wifi coexisting performance.
+
+So decrease that passive scan interval and make the scan window shorter
+on this particular device to allow for spending more time transmitting
+wifi signals: The new scan interval is 250 msec (0x190 * 0.625 msec) and
+the new scan window is 6.25 msec (0xa * 0,625 msec).
+
+This change has a very large impact on the 2.4GHz wifi speeds and gets
+it up to performance comparable with the Windows driver, which seems to
+apply a similar quirk.
+
+The interval and window length were tested and found to work very well
+with a lot of Bluetooth Low Energy devices, including the Surface Pen, a
+Bluetooth Speaker and two modern Bluetooth headphones. All devices were
+discovered immediately after turning them on. Even lower values were
+also tested, but they introduced longer delays until devices get
+discovered.
+
+Patchset: mwifiex
+---
+ drivers/bluetooth/btusb.c | 15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
+index 2a8e2bb038f5..91d15e7c2898 100644
+--- a/drivers/bluetooth/btusb.c
++++ b/drivers/bluetooth/btusb.c
+@@ -65,6 +65,7 @@ static struct usb_driver btusb_driver;
+ #define BTUSB_INTEL_BROKEN_INITIAL_NCMD BIT(25)
+ #define BTUSB_INTEL_NO_WBS_SUPPORT	BIT(26)
+ #define BTUSB_ACTIONS_SEMI		BIT(27)
++#define BTUSB_LOWER_LESCAN_INTERVAL	BIT(28)
+ 
+ static const struct usb_device_id btusb_table[] = {
+ 	/* Generic Bluetooth USB device */
+@@ -468,6 +469,7 @@ static const struct usb_device_id blacklist_table[] = {
+ 	{ USB_DEVICE(0x1286, 0x2044), .driver_info = BTUSB_MARVELL },
+ 	{ USB_DEVICE(0x1286, 0x2046), .driver_info = BTUSB_MARVELL },
+ 	{ USB_DEVICE(0x1286, 0x204e), .driver_info = BTUSB_MARVELL },
++	{ USB_DEVICE(0x1286, 0x204c), .driver_info = BTUSB_LOWER_LESCAN_INTERVAL },
+ 
+ 	/* Intel Bluetooth devices */
+ 	{ USB_DEVICE(0x8087, 0x0025), .driver_info = BTUSB_INTEL_COMBINED },
+@@ -4296,6 +4298,19 @@ static int btusb_probe(struct usb_interface *intf,
+ 	if (id->driver_info & BTUSB_MARVELL)
+ 		hdev->set_bdaddr = btusb_set_bdaddr_marvell;
+ 
++	/* The Marvell 88W8897 combined wifi and bluetooth card is known for
++	 * very bad bt+wifi coexisting performance.
++	 *
++	 * Decrease the passive BT Low Energy scan interval a bit
++	 * (0x0190 * 0.625 msec = 250 msec) and make the scan window shorter
++	 * (0x000a * 0,625 msec = 6.25 msec). This allows for significantly
++	 * higher wifi throughput while passively scanning for BT LE devices.
++	 */
++	if (id->driver_info & BTUSB_LOWER_LESCAN_INTERVAL) {
++		hdev->le_scan_interval = 0x0190;
++		hdev->le_scan_window = 0x000a;
++	}
++
+ 	if (IS_ENABLED(CONFIG_BT_HCIBTUSB_MTK) &&
+ 	    (id->driver_info & BTUSB_MEDIATEK)) {
+ 		hdev->setup = btusb_mtk_setup;
+-- 
+2.41.0
+

patches/6.4/0003-ath10k.patch

@@ -0,0 +1,121 @@
+From eece4cc3f8900799baed625fa8e82ceef9355858 Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Sat, 27 Feb 2021 00:45:52 +0100
+Subject: [PATCH] ath10k: Add module parameters to override board files
+
+Some Surface devices, specifically the Surface Go and AMD version of the
+Surface Laptop 3 (wich both come with QCA6174 WiFi chips), work better
+with a different board file, as it seems that the firmeware included
+upstream is buggy.
+
+As it is generally not a good idea to randomly overwrite files, let
+alone doing so via packages, we add module parameters to override those
+file names in the driver. This allows us to package/deploy the override
+via a modprobe.d config.
+
+Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
+Patchset: ath10k
+---
+ drivers/net/wireless/ath/ath10k/core.c | 58 ++++++++++++++++++++++++++
+ 1 file changed, 58 insertions(+)
+
+diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
+index 5eb131ab916f..67f074a126d1 100644
+--- a/drivers/net/wireless/ath/ath10k/core.c
++++ b/drivers/net/wireless/ath/ath10k/core.c
+@@ -38,6 +38,9 @@ static bool fw_diag_log;
+ /* frame mode values are mapped as per enum ath10k_hw_txrx_mode */
+ unsigned int ath10k_frame_mode = ATH10K_HW_TXRX_NATIVE_WIFI;
+ 
++static char *override_board = "";
++static char *override_board2 = "";
++
+ unsigned long ath10k_coredump_mask = BIT(ATH10K_FW_CRASH_DUMP_REGISTERS) |
+ 				     BIT(ATH10K_FW_CRASH_DUMP_CE_DATA);
+ 
+@@ -50,6 +53,9 @@ module_param(fw_diag_log, bool, 0644);
+ module_param_named(frame_mode, ath10k_frame_mode, uint, 0644);
+ module_param_named(coredump_mask, ath10k_coredump_mask, ulong, 0444);
+ 
++module_param(override_board, charp, 0644);
++module_param(override_board2, charp, 0644);
++
+ MODULE_PARM_DESC(debug_mask, "Debugging mask");
+ MODULE_PARM_DESC(uart_print, "Uart target debugging");
+ MODULE_PARM_DESC(skip_otp, "Skip otp failure for calibration in testmode");
+@@ -59,6 +65,9 @@ MODULE_PARM_DESC(frame_mode,
+ MODULE_PARM_DESC(coredump_mask, "Bitfield of what to include in firmware crash file");
+ MODULE_PARM_DESC(fw_diag_log, "Diag based fw log debugging");
+ 
++MODULE_PARM_DESC(override_board, "Override for board.bin file");
++MODULE_PARM_DESC(override_board2, "Override for board-2.bin file");
++
+ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
+ 	{
+ 		.id = QCA988X_HW_2_0_VERSION,
+@@ -911,6 +920,42 @@ static int ath10k_init_configure_target(struct ath10k *ar)
+ 	return 0;
+ }
+ 
++static const char *ath10k_override_board_fw_file(struct ath10k *ar,
++						 const char *file)
++{
++	if (strcmp(file, "board.bin") == 0) {
++		if (strcmp(override_board, "") == 0)
++			return file;
++
++		if (strcmp(override_board, "none") == 0) {
++			dev_info(ar->dev, "firmware override: pretending 'board.bin' does not exist\n");
++			return NULL;
++		}
++
++		dev_info(ar->dev, "firmware override: replacing 'board.bin' with '%s'\n",
++			 override_board);
++
++		return override_board;
++	}
++
++	if (strcmp(file, "board-2.bin") == 0) {
++		if (strcmp(override_board2, "") == 0)
++			return file;
++
++		if (strcmp(override_board2, "none") == 0) {
++			dev_info(ar->dev, "firmware override: pretending 'board-2.bin' does not exist\n");
++			return NULL;
++		}
++
++		dev_info(ar->dev, "firmware override: replacing 'board-2.bin' with '%s'\n",
++			 override_board2);
++
++		return override_board2;
++	}
++
++	return file;
++}
++
+ static const struct firmware *ath10k_fetch_fw_file(struct ath10k *ar,
+ 						   const char *dir,
+ 						   const char *file)
+@@ -925,6 +970,19 @@ static const struct firmware *ath10k_fetch_fw_file(struct ath10k *ar,
+ 	if (dir == NULL)
+ 		dir = ".";
+ 
++	/* HACK: Override board.bin and board-2.bin files if specified.
++	 *
++	 * Some Surface devices perform better with a different board
++	 * configuration. To this end, one would need to replace the board.bin
++	 * file with the modified config and remove the board-2.bin file.
++	 * Unfortunately, that's not a solution that we can easily package. So
++	 * we add module options to perform these overrides here.
++	 */
++
++	file = ath10k_override_board_fw_file(ar, file);
++	if (!file)
++		return ERR_PTR(-ENOENT);
++
+ 	snprintf(filename, sizeof(filename), "%s/%s", dir, file);
+ 	ret = firmware_request_nowarn(&fw, filename, ar->dev);
+ 	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot fw request '%s': %d\n",
+-- 
+2.41.0
+

patches/6.4/0004-ipts.patch

@@ -0,0 +1,3180 @@
+From da61f0e02b93d0495ce8563c51b7480f35a6bafd Mon Sep 17 00:00:00 2001
+From: Dorian Stoll <dorian.stoll@tmsp.io>
+Date: Thu, 30 Jul 2020 13:21:53 +0200
+Subject: [PATCH] misc: mei: Add missing IPTS device IDs
+
+Patchset: ipts
+---
+ drivers/misc/mei/hw-me-regs.h | 1 +
+ drivers/misc/mei/pci-me.c     | 1 +
+ 2 files changed, 2 insertions(+)
+
+diff --git a/drivers/misc/mei/hw-me-regs.h b/drivers/misc/mei/hw-me-regs.h
+index bdc65d50b945..08723c01d727 100644
+--- a/drivers/misc/mei/hw-me-regs.h
++++ b/drivers/misc/mei/hw-me-regs.h
+@@ -92,6 +92,7 @@
+ #define MEI_DEV_ID_CDF        0x18D3  /* Cedar Fork */
+ 
+ #define MEI_DEV_ID_ICP_LP     0x34E0  /* Ice Lake Point LP */
++#define MEI_DEV_ID_ICP_LP_3   0x34E4  /* Ice Lake Point LP 3 (iTouch) */
+ #define MEI_DEV_ID_ICP_N      0x38E0  /* Ice Lake Point N */
+ 
+ #define MEI_DEV_ID_JSP_N      0x4DE0  /* Jasper Lake Point N */
+diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
+index 676d566f38dd..6b37dd1f8b2a 100644
+--- a/drivers/misc/mei/pci-me.c
++++ b/drivers/misc/mei/pci-me.c
+@@ -97,6 +97,7 @@ static const struct pci_device_id mei_me_pci_tbl[] = {
+ 	{MEI_PCI_DEVICE(MEI_DEV_ID_CMP_H_3, MEI_ME_PCH8_ITOUCH_CFG)},
+ 
+ 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICP_LP, MEI_ME_PCH12_CFG)},
++	{MEI_PCI_DEVICE(MEI_DEV_ID_ICP_LP_3, MEI_ME_PCH12_CFG)},
+ 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICP_N, MEI_ME_PCH12_CFG)},
+ 
+ 	{MEI_PCI_DEVICE(MEI_DEV_ID_TGP_LP, MEI_ME_PCH15_CFG)},
+-- 
+2.41.0
+
+From fd9081bd15f1a9daa1d7256112501378ee499321 Mon Sep 17 00:00:00 2001
+From: Liban Hannan <liban.p@gmail.com>
+Date: Tue, 12 Apr 2022 23:31:12 +0100
+Subject: [PATCH] iommu: ipts: use IOMMU passthrough mode for IPTS
+
+Adds a quirk so that IOMMU uses passthrough mode for the IPTS device.
+Otherwise, when IOMMU is enabled, IPTS produces DMAR errors like:
+
+DMAR: [DMA Read NO_PASID] Request device [00:16.4] fault addr
+0x104ea3000 [fault reason 0x06] PTE Read access is not set
+
+This is very similar to the bug described at:
+https://bugs.launchpad.net/bugs/1958004
+
+Fixed with the following patch which this patch basically copies:
+https://launchpadlibrarian.net/586396847/43255ca.diff
+Patchset: ipts
+---
+ drivers/iommu/intel/iommu.c | 24 ++++++++++++++++++++++++
+ 1 file changed, 24 insertions(+)
+
+diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
+index b871a6afd803..0d4542b7365d 100644
+--- a/drivers/iommu/intel/iommu.c
++++ b/drivers/iommu/intel/iommu.c
+@@ -37,6 +37,8 @@
+ #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
+ #define IS_USB_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_SERIAL_USB)
+ #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
++#define IS_IPTS(pdev) ((pdev)->vendor == PCI_VENDOR_ID_INTEL &&	\
++			    ((pdev)->device == 0x9d3e))
+ #define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e)
+ 
+ #define IOAPIC_RANGE_START	(0xfee00000)
+@@ -287,12 +289,14 @@ int intel_iommu_enabled = 0;
+ EXPORT_SYMBOL_GPL(intel_iommu_enabled);
+ 
+ static int dmar_map_gfx = 1;
++static int dmar_map_ipts = 1;
+ static int intel_iommu_superpage = 1;
+ static int iommu_identity_mapping;
+ static int iommu_skip_te_disable;
+ 
+ #define IDENTMAP_GFX		2
+ #define IDENTMAP_AZALIA		4
++#define IDENTMAP_IPTS		16
+ 
+ const struct iommu_ops intel_iommu_ops;
+ 
+@@ -2560,6 +2564,9 @@ static int device_def_domain_type(struct device *dev)
+ 
+ 		if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev))
+ 			return IOMMU_DOMAIN_IDENTITY;
++
++		if ((iommu_identity_mapping & IDENTMAP_IPTS) && IS_IPTS(pdev))
++			return IOMMU_DOMAIN_IDENTITY;
+ 	}
+ 
+ 	return 0;
+@@ -2867,6 +2874,9 @@ static int __init init_dmars(void)
+ 	if (!dmar_map_gfx)
+ 		iommu_identity_mapping |= IDENTMAP_GFX;
+ 
++	if (!dmar_map_ipts)
++		iommu_identity_mapping |= IDENTMAP_IPTS;
++
+ 	check_tylersburg_isoch();
+ 
+ 	ret = si_domain_init(hw_pass_through);
+@@ -4778,6 +4788,17 @@ static void quirk_iommu_igfx(struct pci_dev *dev)
+ 	dmar_map_gfx = 0;
+ }
+ 
++static void quirk_iommu_ipts(struct pci_dev *dev)
++{
++	if (!IS_IPTS(dev))
++		return;
++
++	if (risky_device(dev))
++		return;
++
++	pci_info(dev, "Passthrough IOMMU for IPTS\n");
++	dmar_map_ipts = 0;
++}
+ /* G4x/GM45 integrated gfx dmar support is totally busted. */
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_igfx);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e00, quirk_iommu_igfx);
+@@ -4813,6 +4834,9 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x1632, quirk_iommu_igfx);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x163A, quirk_iommu_igfx);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x163D, quirk_iommu_igfx);
+ 
++/* disable IPTS dmar support */
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9D3E, quirk_iommu_ipts);
++
+ static void quirk_iommu_rwbf(struct pci_dev *dev)
+ {
+ 	if (risky_device(dev))
+-- 
+2.41.0
+
+From ea8c3ec733d9726343e164157404b5b1b2a0619a Mon Sep 17 00:00:00 2001
+From: Dorian Stoll <dorian.stoll@tmsp.io>
+Date: Sun, 11 Dec 2022 12:00:59 +0100
+Subject: [PATCH] hid: Add support for Intel Precise Touch and Stylus
+
+Based on linux-surface/intel-precise-touch@8abe268
+
+Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>
+Patchset: ipts
+---
+ drivers/hid/Kconfig            |   2 +
+ drivers/hid/Makefile           |   2 +
+ drivers/hid/ipts/Kconfig       |  14 +
+ drivers/hid/ipts/Makefile      |  14 +
+ drivers/hid/ipts/cmd.c         |  62 +++++
+ drivers/hid/ipts/cmd.h         |  61 ++++
+ drivers/hid/ipts/context.h     |  51 ++++
+ drivers/hid/ipts/control.c     | 495 +++++++++++++++++++++++++++++++++
+ drivers/hid/ipts/control.h     | 127 +++++++++
+ drivers/hid/ipts/desc.h        |  81 ++++++
+ drivers/hid/ipts/hid.c         | 348 +++++++++++++++++++++++
+ drivers/hid/ipts/hid.h         |  22 ++
+ drivers/hid/ipts/main.c        | 127 +++++++++
+ drivers/hid/ipts/mei.c         | 189 +++++++++++++
+ drivers/hid/ipts/mei.h         |  67 +++++
+ drivers/hid/ipts/receiver.c    | 249 +++++++++++++++++
+ drivers/hid/ipts/receiver.h    |  17 ++
+ drivers/hid/ipts/resources.c   | 108 +++++++
+ drivers/hid/ipts/resources.h   |  39 +++
+ drivers/hid/ipts/spec-data.h   | 100 +++++++
+ drivers/hid/ipts/spec-device.h | 285 +++++++++++++++++++
+ drivers/hid/ipts/spec-hid.h    |  35 +++
+ drivers/hid/ipts/thread.c      |  85 ++++++
+ drivers/hid/ipts/thread.h      |  60 ++++
+ 24 files changed, 2640 insertions(+)
+ create mode 100644 drivers/hid/ipts/Kconfig
+ create mode 100644 drivers/hid/ipts/Makefile
+ create mode 100644 drivers/hid/ipts/cmd.c
+ create mode 100644 drivers/hid/ipts/cmd.h
+ create mode 100644 drivers/hid/ipts/context.h
+ create mode 100644 drivers/hid/ipts/control.c
+ create mode 100644 drivers/hid/ipts/control.h
+ create mode 100644 drivers/hid/ipts/desc.h
+ create mode 100644 drivers/hid/ipts/hid.c
+ create mode 100644 drivers/hid/ipts/hid.h
+ create mode 100644 drivers/hid/ipts/main.c
+ create mode 100644 drivers/hid/ipts/mei.c
+ create mode 100644 drivers/hid/ipts/mei.h
+ create mode 100644 drivers/hid/ipts/receiver.c
+ create mode 100644 drivers/hid/ipts/receiver.h
+ create mode 100644 drivers/hid/ipts/resources.c
+ create mode 100644 drivers/hid/ipts/resources.h
+ create mode 100644 drivers/hid/ipts/spec-data.h
+ create mode 100644 drivers/hid/ipts/spec-device.h
+ create mode 100644 drivers/hid/ipts/spec-hid.h
+ create mode 100644 drivers/hid/ipts/thread.c
+ create mode 100644 drivers/hid/ipts/thread.h
+
+diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
+index 4ce012f83253..7945cb57f531 100644
+--- a/drivers/hid/Kconfig
++++ b/drivers/hid/Kconfig
+@@ -1316,4 +1316,6 @@ source "drivers/hid/amd-sfh-hid/Kconfig"
+ 
+ source "drivers/hid/surface-hid/Kconfig"
+ 
++source "drivers/hid/ipts/Kconfig"
++
+ endif # HID_SUPPORT
+diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
+index 5d37cacbde33..285e12d95b0e 100644
+--- a/drivers/hid/Makefile
++++ b/drivers/hid/Makefile
+@@ -167,3 +167,5 @@ obj-$(INTEL_ISH_FIRMWARE_DOWNLOADER)	+= intel-ish-hid/
+ obj-$(CONFIG_AMD_SFH_HID)       += amd-sfh-hid/
+ 
+ obj-$(CONFIG_SURFACE_HID_CORE)  += surface-hid/
++
++obj-$(CONFIG_HID_IPTS)          += ipts/
+diff --git a/drivers/hid/ipts/Kconfig b/drivers/hid/ipts/Kconfig
+new file mode 100644
+index 000000000000..297401bd388d
+--- /dev/null
++++ b/drivers/hid/ipts/Kconfig
+@@ -0,0 +1,14 @@
++# SPDX-License-Identifier: GPL-2.0-or-later
++
++config HID_IPTS
++	tristate "Intel Precise Touch & Stylus"
++	depends on INTEL_MEI
++	depends on HID
++	help
++	  Say Y here if your system has a touchscreen using Intels
++	  Precise Touch & Stylus (IPTS) technology.
++
++	  If unsure say N.
++
++	  To compile this driver as a module, choose M here: the
++	  module will be called ipts.
+diff --git a/drivers/hid/ipts/Makefile b/drivers/hid/ipts/Makefile
+new file mode 100644
+index 000000000000..0fe655bccdc0
+--- /dev/null
++++ b/drivers/hid/ipts/Makefile
+@@ -0,0 +1,14 @@
++# SPDX-License-Identifier: GPL-2.0-or-later
++#
++# Makefile for the IPTS touchscreen driver
++#
++
++obj-$(CONFIG_HID_IPTS) += ipts.o
++ipts-objs := cmd.o
++ipts-objs += control.o
++ipts-objs += hid.o
++ipts-objs += main.o
++ipts-objs += mei.o
++ipts-objs += receiver.o
++ipts-objs += resources.o
++ipts-objs += thread.o
+diff --git a/drivers/hid/ipts/cmd.c b/drivers/hid/ipts/cmd.c
+new file mode 100644
+index 000000000000..7fd69271ccd5
+--- /dev/null
++++ b/drivers/hid/ipts/cmd.c
+@@ -0,0 +1,62 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/errno.h>
++#include <linux/types.h>
++
++#include "cmd.h"
++#include "context.h"
++#include "mei.h"
++#include "spec-device.h"
++
++int ipts_cmd_recv_timeout(struct ipts_context *ipts, enum ipts_command_code code,
++			  struct ipts_response *rsp, u64 timeout)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!rsp)
++		return -EFAULT;
++
++	/*
++	 * In a response, the command code will have the most significant bit flipped to 1.
++	 * If code is passed to ipts_mei_recv as is, no messages will be received.
++	 */
++	ret = ipts_mei_recv(&ipts->mei, code | IPTS_RSP_BIT, rsp, timeout);
++	if (ret < 0)
++		return ret;
++
++	dev_dbg(ipts->dev, "Received 0x%02X with status 0x%02X\n", code, rsp->status);
++
++	/*
++	 * Some devices will always return this error.
++	 * It is allowed to ignore it and to try continuing.
++	 */
++	if (rsp->status == IPTS_STATUS_COMPAT_CHECK_FAIL)
++		rsp->status = IPTS_STATUS_SUCCESS;
++
++	return 0;
++}
++
++int ipts_cmd_send(struct ipts_context *ipts, enum ipts_command_code code, void *data, size_t size)
++{
++	struct ipts_command cmd = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	cmd.cmd = code;
++
++	if (data && size > 0)
++		memcpy(cmd.payload, data, size);
++
++	dev_dbg(ipts->dev, "Sending 0x%02X with %ld bytes payload\n", code, size);
++	return ipts_mei_send(&ipts->mei, &cmd, sizeof(cmd.cmd) + size);
++}
+diff --git a/drivers/hid/ipts/cmd.h b/drivers/hid/ipts/cmd.h
+new file mode 100644
+index 000000000000..924758ffee67
+--- /dev/null
++++ b/drivers/hid/ipts/cmd.h
+@@ -0,0 +1,61 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_CMD_H
++#define IPTS_CMD_H
++
++#include <linux/types.h>
++
++#include "context.h"
++#include "spec-device.h"
++
++/*
++ * The default timeout for receiving responses
++ */
++#define IPTS_CMD_DEFAULT_TIMEOUT 1000
++
++/*
++ * ipts_cmd_recv_timeout() - Receives a response to a command.
++ * @ipts: The IPTS driver context.
++ * @code: The type of the command / response.
++ * @rsp: The address that the received response will be copied to.
++ * @timeout: How many milliseconds the function will wait at most.
++ *
++ * A negative timeout means to wait forever.
++ *
++ * Returns: 0 on success, <0 on error, -EAGAIN if no response has been received.
++ */
++int ipts_cmd_recv_timeout(struct ipts_context *ipts, enum ipts_command_code code,
++			  struct ipts_response *rsp, u64 timeout);
++
++/*
++ * ipts_cmd_recv() - Receives a response to a command.
++ * @ipts: The IPTS driver context.
++ * @code: The type of the command / response.
++ * @rsp: The address that the received response will be copied to.
++ *
++ * Returns: 0 on success, <0 on error, -EAGAIN if no response has been received.
++ */
++static inline int ipts_cmd_recv(struct ipts_context *ipts, enum ipts_command_code code,
++				struct ipts_response *rsp)
++{
++	return ipts_cmd_recv_timeout(ipts, code, rsp, IPTS_CMD_DEFAULT_TIMEOUT);
++}
++
++/*
++ * ipts_cmd_send() - Executes a command on the device.
++ * @ipts: The IPTS driver context.
++ * @code: The type of the command to execute.
++ * @data: The payload containing parameters for the command.
++ * @size: The size of the payload.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_cmd_send(struct ipts_context *ipts, enum ipts_command_code code, void *data, size_t size);
++
++#endif /* IPTS_CMD_H */
+diff --git a/drivers/hid/ipts/context.h b/drivers/hid/ipts/context.h
+new file mode 100644
+index 000000000000..3450a95e66ee
+--- /dev/null
++++ b/drivers/hid/ipts/context.h
+@@ -0,0 +1,51 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_CONTEXT_H
++#define IPTS_CONTEXT_H
++
++#include <linux/completion.h>
++#include <linux/device.h>
++#include <linux/hid.h>
++#include <linux/mei_cl_bus.h>
++#include <linux/mutex.h>
++#include <linux/sched.h>
++#include <linux/types.h>
++
++#include "mei.h"
++#include "resources.h"
++#include "spec-device.h"
++#include "thread.h"
++
++struct ipts_context {
++	struct device *dev;
++	struct ipts_mei mei;
++
++	enum ipts_mode mode;
++
++	/*
++	 * Prevents concurrent GET_FEATURE reports.
++	 */
++	struct mutex feature_lock;
++	struct completion feature_event;
++
++	/*
++	 * These are not inside of struct ipts_resources
++	 * because they don't own the memory they point to.
++	 */
++	struct ipts_buffer feature_report;
++	struct ipts_buffer descriptor;
++
++	struct hid_device *hid;
++	struct ipts_device_info info;
++	struct ipts_resources resources;
++
++	struct ipts_thread receiver_loop;
++};
++
++#endif /* IPTS_CONTEXT_H */
+diff --git a/drivers/hid/ipts/control.c b/drivers/hid/ipts/control.c
+new file mode 100644
+index 000000000000..2f61500b5119
+--- /dev/null
++++ b/drivers/hid/ipts/control.c
+@@ -0,0 +1,495 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/delay.h>
++#include <linux/dev_printk.h>
++#include <linux/errno.h>
++#include <linux/kernel.h>
++#include <linux/kthread.h>
++#include <linux/types.h>
++
++#include "cmd.h"
++#include "context.h"
++#include "control.h"
++#include "desc.h"
++#include "hid.h"
++#include "receiver.h"
++#include "resources.h"
++#include "spec-data.h"
++#include "spec-device.h"
++
++static int ipts_control_get_device_info(struct ipts_context *ipts, struct ipts_device_info *info)
++{
++	int ret = 0;
++	struct ipts_response rsp = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!info)
++		return -EFAULT;
++
++	ret = ipts_cmd_send(ipts, IPTS_CMD_GET_DEVICE_INFO, NULL, 0);
++	if (ret) {
++		dev_err(ipts->dev, "GET_DEVICE_INFO: send failed: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_cmd_recv(ipts, IPTS_CMD_GET_DEVICE_INFO, &rsp);
++	if (ret) {
++		dev_err(ipts->dev, "GET_DEVICE_INFO: recv failed: %d\n", ret);
++		return ret;
++	}
++
++	if (rsp.status != IPTS_STATUS_SUCCESS) {
++		dev_err(ipts->dev, "GET_DEVICE_INFO: cmd failed: %d\n", rsp.status);
++		return -EBADR;
++	}
++
++	memcpy(info, rsp.payload, sizeof(*info));
++	return 0;
++}
++
++static int ipts_control_set_mode(struct ipts_context *ipts, enum ipts_mode mode)
++{
++	int ret = 0;
++	struct ipts_set_mode cmd = { 0 };
++	struct ipts_response rsp = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	cmd.mode = mode;
++
++	ret = ipts_cmd_send(ipts, IPTS_CMD_SET_MODE, &cmd, sizeof(cmd));
++	if (ret) {
++		dev_err(ipts->dev, "SET_MODE: send failed: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_cmd_recv(ipts, IPTS_CMD_SET_MODE, &rsp);
++	if (ret) {
++		dev_err(ipts->dev, "SET_MODE: recv failed: %d\n", ret);
++		return ret;
++	}
++
++	if (rsp.status != IPTS_STATUS_SUCCESS) {
++		dev_err(ipts->dev, "SET_MODE: cmd failed: %d\n", rsp.status);
++		return -EBADR;
++	}
++
++	return 0;
++}
++
++static int ipts_control_set_mem_window(struct ipts_context *ipts, struct ipts_resources *res)
++{
++	int ret = 0;
++	struct ipts_mem_window cmd = { 0 };
++	struct ipts_response rsp = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!res)
++		return -EFAULT;
++
++	for (int i = 0; i < IPTS_BUFFERS; i++) {
++		cmd.data_addr_lower[i] = lower_32_bits(res->data[i].dma_address);
++		cmd.data_addr_upper[i] = upper_32_bits(res->data[i].dma_address);
++		cmd.feedback_addr_lower[i] = lower_32_bits(res->feedback[i].dma_address);
++		cmd.feedback_addr_upper[i] = upper_32_bits(res->feedback[i].dma_address);
++	}
++
++	cmd.workqueue_addr_lower = lower_32_bits(res->workqueue.dma_address);
++	cmd.workqueue_addr_upper = upper_32_bits(res->workqueue.dma_address);
++
++	cmd.doorbell_addr_lower = lower_32_bits(res->doorbell.dma_address);
++	cmd.doorbell_addr_upper = upper_32_bits(res->doorbell.dma_address);
++
++	cmd.hid2me_addr_lower = lower_32_bits(res->hid2me.dma_address);
++	cmd.hid2me_addr_upper = upper_32_bits(res->hid2me.dma_address);
++
++	cmd.workqueue_size = IPTS_WORKQUEUE_SIZE;
++	cmd.workqueue_item_size = IPTS_WORKQUEUE_ITEM_SIZE;
++
++	ret = ipts_cmd_send(ipts, IPTS_CMD_SET_MEM_WINDOW, &cmd, sizeof(cmd));
++	if (ret) {
++		dev_err(ipts->dev, "SET_MEM_WINDOW: send failed: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_cmd_recv(ipts, IPTS_CMD_SET_MEM_WINDOW, &rsp);
++	if (ret) {
++		dev_err(ipts->dev, "SET_MEM_WINDOW: recv failed: %d\n", ret);
++		return ret;
++	}
++
++	if (rsp.status != IPTS_STATUS_SUCCESS) {
++		dev_err(ipts->dev, "SET_MEM_WINDOW: cmd failed: %d\n", rsp.status);
++		return -EBADR;
++	}
++
++	return 0;
++}
++
++static int ipts_control_get_descriptor(struct ipts_context *ipts)
++{
++	int ret = 0;
++	struct ipts_data_header *header = NULL;
++	struct ipts_get_descriptor cmd = { 0 };
++	struct ipts_response rsp = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!ipts->resources.descriptor.address)
++		return -EFAULT;
++
++	memset(ipts->resources.descriptor.address, 0, ipts->resources.descriptor.size);
++
++	cmd.addr_lower = lower_32_bits(ipts->resources.descriptor.dma_address);
++	cmd.addr_upper = upper_32_bits(ipts->resources.descriptor.dma_address);
++	cmd.magic = 8;
++
++	ret = ipts_cmd_send(ipts, IPTS_CMD_GET_DESCRIPTOR, &cmd, sizeof(cmd));
++	if (ret) {
++		dev_err(ipts->dev, "GET_DESCRIPTOR: send failed: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_cmd_recv(ipts, IPTS_CMD_GET_DESCRIPTOR, &rsp);
++	if (ret) {
++		dev_err(ipts->dev, "GET_DESCRIPTOR: recv failed: %d\n", ret);
++		return ret;
++	}
++
++	if (rsp.status != IPTS_STATUS_SUCCESS) {
++		dev_err(ipts->dev, "GET_DESCRIPTOR: cmd failed: %d\n", rsp.status);
++		return -EBADR;
++	}
++
++	header = (struct ipts_data_header *)ipts->resources.descriptor.address;
++
++	if (header->type == IPTS_DATA_TYPE_DESCRIPTOR) {
++		ipts->descriptor.address = &header->data[8];
++		ipts->descriptor.size = header->size - 8;
++
++		return 0;
++	}
++
++	return -ENODATA;
++}
++
++int ipts_control_request_flush(struct ipts_context *ipts)
++{
++	int ret = 0;
++	struct ipts_quiesce_io cmd = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	ret = ipts_cmd_send(ipts, IPTS_CMD_QUIESCE_IO, &cmd, sizeof(cmd));
++	if (ret)
++		dev_err(ipts->dev, "QUIESCE_IO: send failed: %d\n", ret);
++
++	return ret;
++}
++
++int ipts_control_wait_flush(struct ipts_context *ipts)
++{
++	int ret = 0;
++	struct ipts_response rsp = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	ret = ipts_cmd_recv(ipts, IPTS_CMD_QUIESCE_IO, &rsp);
++	if (ret) {
++		dev_err(ipts->dev, "QUIESCE_IO: recv failed: %d\n", ret);
++		return ret;
++	}
++
++	if (rsp.status == IPTS_STATUS_TIMEOUT)
++		return -EAGAIN;
++
++	if (rsp.status != IPTS_STATUS_SUCCESS) {
++		dev_err(ipts->dev, "QUIESCE_IO: cmd failed: %d\n", rsp.status);
++		return -EBADR;
++	}
++
++	return 0;
++}
++
++int ipts_control_request_data(struct ipts_context *ipts)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	ret = ipts_cmd_send(ipts, IPTS_CMD_READY_FOR_DATA, NULL, 0);
++	if (ret)
++		dev_err(ipts->dev, "READY_FOR_DATA: send failed: %d\n", ret);
++
++	return ret;
++}
++
++int ipts_control_wait_data(struct ipts_context *ipts, bool shutdown)
++{
++	int ret = 0;
++	struct ipts_response rsp = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!shutdown)
++		ret = ipts_cmd_recv_timeout(ipts, IPTS_CMD_READY_FOR_DATA, &rsp, 0);
++	else
++		ret = ipts_cmd_recv(ipts, IPTS_CMD_READY_FOR_DATA, &rsp);
++
++	if (ret) {
++		if (ret != -EAGAIN)
++			dev_err(ipts->dev, "READY_FOR_DATA: recv failed: %d\n", ret);
++
++		return ret;
++	}
++
++	/*
++	 * During shutdown, it is possible that the sensor has already been disabled.
++	 */
++	if (rsp.status == IPTS_STATUS_SENSOR_DISABLED)
++		return 0;
++
++	if (rsp.status == IPTS_STATUS_TIMEOUT)
++		return -EAGAIN;
++
++	if (rsp.status != IPTS_STATUS_SUCCESS) {
++		dev_err(ipts->dev, "READY_FOR_DATA: cmd failed: %d\n", rsp.status);
++		return -EBADR;
++	}
++
++	return 0;
++}
++
++int ipts_control_send_feedback(struct ipts_context *ipts, u32 buffer)
++{
++	int ret = 0;
++	struct ipts_feedback cmd = { 0 };
++	struct ipts_response rsp = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	cmd.buffer = buffer;
++
++	ret = ipts_cmd_send(ipts, IPTS_CMD_FEEDBACK, &cmd, sizeof(cmd));
++	if (ret) {
++		dev_err(ipts->dev, "FEEDBACK: send failed: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_cmd_recv(ipts, IPTS_CMD_FEEDBACK, &rsp);
++	if (ret) {
++		dev_err(ipts->dev, "FEEDBACK: recv failed: %d\n", ret);
++		return ret;
++	}
++
++	/*
++	 * We don't know what feedback data looks like so we are sending zeros.
++	 * See also ipts_control_refill_buffer.
++	 */
++	if (rsp.status == IPTS_STATUS_INVALID_PARAMS)
++		return 0;
++
++	if (rsp.status != IPTS_STATUS_SUCCESS) {
++		dev_err(ipts->dev, "FEEDBACK: cmd failed: %d\n", rsp.status);
++		return -EBADR;
++	}
++
++	return 0;
++}
++
++int ipts_control_hid2me_feedback(struct ipts_context *ipts, enum ipts_feedback_cmd_type cmd,
++				 enum ipts_feedback_data_type type, void *data, size_t size)
++{
++	struct ipts_feedback_header *header = NULL;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!ipts->resources.hid2me.address)
++		return -EFAULT;
++
++	memset(ipts->resources.hid2me.address, 0, ipts->resources.hid2me.size);
++	header = (struct ipts_feedback_header *)ipts->resources.hid2me.address;
++
++	header->cmd_type = cmd;
++	header->data_type = type;
++	header->size = size;
++	header->buffer = IPTS_HID2ME_BUFFER;
++
++	if (size + sizeof(*header) > ipts->resources.hid2me.size)
++		return -EINVAL;
++
++	if (data && size > 0)
++		memcpy(header->payload, data, size);
++
++	return ipts_control_send_feedback(ipts, IPTS_HID2ME_BUFFER);
++}
++
++static inline int ipts_control_reset_sensor(struct ipts_context *ipts)
++{
++	return ipts_control_hid2me_feedback(ipts, IPTS_FEEDBACK_CMD_TYPE_SOFT_RESET,
++					    IPTS_FEEDBACK_DATA_TYPE_VENDOR, NULL, 0);
++}
++
++int ipts_control_start(struct ipts_context *ipts)
++{
++	int ret = 0;
++	struct ipts_device_info info = { 0 };
++
++	if (!ipts)
++		return -EFAULT;
++
++	dev_info(ipts->dev, "Starting IPTS\n");
++
++	ret = ipts_control_get_device_info(ipts, &info);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to get device info: %d\n", ret);
++		return ret;
++	}
++
++	ipts->info = info;
++
++	ret = ipts_resources_init(&ipts->resources, ipts->dev, info.data_size, info.feedback_size);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to allocate buffers: %d", ret);
++		return ret;
++	}
++
++	dev_info(ipts->dev, "IPTS EDS Version: %d\n", info.intf_eds);
++
++	/*
++	 * Handle newer devices
++	 */
++	if (info.intf_eds > 1) {
++		/*
++		 * Fetching the descriptor will only work on newer devices.
++		 * For older devices, a fallback descriptor will be used.
++		 */
++		ret = ipts_control_get_descriptor(ipts);
++		if (ret) {
++			dev_err(ipts->dev, "Failed to fetch HID descriptor: %d\n", ret);
++			return ret;
++		}
++
++		/*
++		 * Newer devices can be directly initialized in doorbell mode.
++		 */
++		ipts->mode = IPTS_MODE_DOORBELL;
++	}
++
++	ret = ipts_control_set_mode(ipts, ipts->mode);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to set mode: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_control_set_mem_window(ipts, &ipts->resources);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to set memory window: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_receiver_start(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to start receiver: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_control_request_data(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to request data: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_hid_init(ipts, info);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to initialize HID device: %d\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++static int _ipts_control_stop(struct ipts_context *ipts)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	dev_info(ipts->dev, "Stopping IPTS\n");
++
++	ret = ipts_receiver_stop(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to stop receiver: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_control_reset_sensor(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to reset sensor: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_resources_free(&ipts->resources);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to free resources: %d\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++int ipts_control_stop(struct ipts_context *ipts)
++{
++	int ret = 0;
++
++	ret = _ipts_control_stop(ipts);
++	if (ret)
++		return ret;
++
++	ret = ipts_hid_free(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to free HID device: %d\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++int ipts_control_restart(struct ipts_context *ipts)
++{
++	int ret = 0;
++
++	ret = _ipts_control_stop(ipts);
++	if (ret)
++		return ret;
++
++	/*
++	 * Give the sensor some time to come back from resetting
++	 */
++	msleep(1000);
++
++	ret = ipts_control_start(ipts);
++	if (ret)
++		return ret;
++
++	return 0;
++}
+diff --git a/drivers/hid/ipts/control.h b/drivers/hid/ipts/control.h
+new file mode 100644
+index 000000000000..744bb92d682a
+--- /dev/null
++++ b/drivers/hid/ipts/control.h
+@@ -0,0 +1,127 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_CONTROL_H
++#define IPTS_CONTROL_H
++
++#include <linux/types.h>
++
++#include "context.h"
++#include "spec-data.h"
++#include "spec-device.h"
++
++/*
++ * ipts_control_request_flush() - Stop the data flow.
++ * @ipts: The IPTS driver context.
++ *
++ * Runs the command to stop the data flow on the device.
++ * All outstanding data needs to be acknowledged using feedback before the command will return.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_request_flush(struct ipts_context *ipts);
++
++/*
++ * ipts_control_wait_flush() - Wait until data flow has been stopped.
++ * @ipts: The IPTS driver context.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_wait_flush(struct ipts_context *ipts);
++
++/*
++ * ipts_control_wait_flush() - Notify the device that the driver can receive new data.
++ * @ipts: The IPTS driver context.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_request_data(struct ipts_context *ipts);
++
++/*
++ * ipts_control_wait_data() - Wait until new data is available.
++ * @ipts: The IPTS driver context.
++ * @block: Whether to block execution until data is available.
++ *
++ * In doorbell mode, this function will never return while the data flow is active. Instead,
++ * the doorbell will be incremented when new data is available.
++ *
++ * Returns: 0 on success, <0 on error, -EAGAIN if no data is available.
++ */
++int ipts_control_wait_data(struct ipts_context *ipts, bool block);
++
++/*
++ * ipts_control_send_feedback() - Submits a feedback buffer to the device.
++ * @ipts: The IPTS driver context.
++ * @buffer: The ID of the buffer containing feedback data.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_send_feedback(struct ipts_context *ipts, u32 buffer);
++
++/*
++ * ipts_control_hid2me_feedback() - Sends HID2ME feedback, a special type of feedback.
++ * @ipts: The IPTS driver context.
++ * @cmd: The command that will be run on the device.
++ * @type: The type of the payload that is sent to the device.
++ * @data: The payload of the feedback command.
++ * @size: The size of the payload.
++ *
++ * HID2ME feedback is a special type of feedback, because it allows interfacing with
++ * the HID API of the device at any moment, without requiring a buffer that has to
++ * be acknowledged.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_hid2me_feedback(struct ipts_context *ipts, enum ipts_feedback_cmd_type cmd,
++				 enum ipts_feedback_data_type type, void *data, size_t size);
++
++/*
++ * ipts_control_refill_buffer() - Acknowledges that data in a buffer has been processed.
++ * @ipts: The IPTS driver context.
++ * @buffer: The buffer that has been processed and can be refilled.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++static inline int ipts_control_refill_buffer(struct ipts_context *ipts, u32 buffer)
++{
++	/*
++	 * IPTS expects structured data in the feedback buffer matching the buffer that will be
++	 * refilled. We don't know what that data looks like, so we just keep the buffer empty.
++	 * This results in an INVALID_PARAMS error, but the buffer gets refilled without an issue.
++	 * Sending a minimal structure with the buffer ID fixes the error, but breaks refilling
++	 * the buffers on some devices.
++	 */
++
++	return ipts_control_send_feedback(ipts, buffer);
++}
++
++/*
++ * ipts_control_start() - Initialized the device and starts the data flow.
++ * @ipts: The IPTS driver context.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_start(struct ipts_context *ipts);
++
++/*
++ * ipts_control_stop() - Stops the data flow and resets the device.
++ * @ipts: The IPTS driver context.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_stop(struct ipts_context *ipts);
++
++/*
++ * ipts_control_restart() - Stops the device and starts it again.
++ * @ipts: The IPTS driver context.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_control_restart(struct ipts_context *ipts);
++
++#endif /* IPTS_CONTROL_H */
+diff --git a/drivers/hid/ipts/desc.h b/drivers/hid/ipts/desc.h
+new file mode 100644
+index 000000000000..c058974a03a1
+--- /dev/null
++++ b/drivers/hid/ipts/desc.h
+@@ -0,0 +1,81 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2022-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_DESC_H
++#define IPTS_DESC_H
++
++#include <linux/types.h>
++
++#define IPTS_HID_REPORT_SINGLETOUCH 64
++#define IPTS_HID_REPORT_DATA	    65
++#define IPTS_HID_REPORT_SET_MODE    66
++
++#define IPTS_HID_REPORT_DATA_SIZE 7485
++
++/*
++ * HID descriptor for singletouch data.
++ * This descriptor should be present on all IPTS devices.
++ */
++static const u8 ipts_singletouch_descriptor[] = {
++	0x05, 0x0D,	  /*  Usage Page (Digitizer),            */
++	0x09, 0x04,	  /*  Usage (Touchscreen),               */
++	0xA1, 0x01,	  /*  Collection (Application),          */
++	0x85, 0x40,	  /*      Report ID (64),                */
++	0x09, 0x42,	  /*      Usage (Tip Switch),            */
++	0x15, 0x00,	  /*      Logical Minimum (0),           */
++	0x25, 0x01,	  /*      Logical Maximum (1),           */
++	0x75, 0x01,	  /*      Report Size (1),               */
++	0x95, 0x01,	  /*      Report Count (1),              */
++	0x81, 0x02,	  /*      Input (Variable),              */
++	0x95, 0x07,	  /*      Report Count (7),              */
++	0x81, 0x03,	  /*      Input (Constant, Variable),    */
++	0x05, 0x01,	  /*      Usage Page (Desktop),          */
++	0x09, 0x30,	  /*      Usage (X),                     */
++	0x75, 0x10,	  /*      Report Size (16),              */
++	0x95, 0x01,	  /*      Report Count (1),              */
++	0xA4,		  /*      Push,                          */
++	0x55, 0x0E,	  /*      Unit Exponent (14),            */
++	0x65, 0x11,	  /*      Unit (Centimeter),             */
++	0x46, 0x76, 0x0B, /*      Physical Maximum (2934),       */
++	0x26, 0xFF, 0x7F, /*      Logical Maximum (32767),       */
++	0x81, 0x02,	  /*      Input (Variable),              */
++	0x09, 0x31,	  /*      Usage (Y),                     */
++	0x46, 0x74, 0x06, /*      Physical Maximum (1652),       */
++	0x26, 0xFF, 0x7F, /*      Logical Maximum (32767),       */
++	0x81, 0x02,	  /*      Input (Variable),              */
++	0xB4,		  /*      Pop,                           */
++	0xC0,		  /*  End Collection                     */
++};
++
++/*
++ * Fallback HID descriptor for older devices that do not have
++ * the ability to query their HID descriptor.
++ */
++static const u8 ipts_fallback_descriptor[] = {
++	0x05, 0x0D,	  /*  Usage Page (Digitizer),            */
++	0x09, 0x0F,	  /*  Usage (Capacitive Hm Digitizer),   */
++	0xA1, 0x01,	  /*  Collection (Application),          */
++	0x85, 0x41,	  /*      Report ID (65),                */
++	0x09, 0x56,	  /*      Usage (Scan Time),             */
++	0x95, 0x01,	  /*      Report Count (1),              */
++	0x75, 0x10,	  /*      Report Size (16),              */
++	0x81, 0x02,	  /*      Input (Variable),              */
++	0x09, 0x61,	  /*      Usage (Gesture Char Quality),  */
++	0x75, 0x08,	  /*      Report Size (8),               */
++	0x96, 0x3D, 0x1D, /*      Report Count (7485),           */
++	0x81, 0x03,	  /*      Input (Constant, Variable),    */
++	0x85, 0x42,	  /*      Report ID (66),                */
++	0x06, 0x00, 0xFF, /*      Usage Page (FF00h),            */
++	0x09, 0xC8,	  /*      Usage (C8h),                   */
++	0x75, 0x08,	  /*      Report Size (8),               */
++	0x95, 0x01,	  /*      Report Count (1),              */
++	0xB1, 0x02,	  /*      Feature (Variable),            */
++	0xC0,		  /*  End Collection,                    */
++};
++
++#endif /* IPTS_DESC_H */
+diff --git a/drivers/hid/ipts/hid.c b/drivers/hid/ipts/hid.c
+new file mode 100644
+index 000000000000..6782394e8dde
+--- /dev/null
++++ b/drivers/hid/ipts/hid.c
+@@ -0,0 +1,348 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2022-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/completion.h>
++#include <linux/gfp.h>
++#include <linux/hid.h>
++#include <linux/mutex.h>
++#include <linux/slab.h>
++#include <linux/types.h>
++
++#include "context.h"
++#include "control.h"
++#include "desc.h"
++#include "hid.h"
++#include "spec-data.h"
++#include "spec-device.h"
++#include "spec-hid.h"
++
++static int ipts_hid_start(struct hid_device *hid)
++{
++	return 0;
++}
++
++static void ipts_hid_stop(struct hid_device *hid)
++{
++}
++
++static int ipts_hid_switch_mode(struct ipts_context *ipts, enum ipts_mode mode)
++{
++	if (!ipts)
++		return -EFAULT;
++
++	if (ipts->mode == mode)
++		return 0;
++
++	/*
++	 * This is only allowed on older devices.
++	 */
++	if (ipts->info.intf_eds > 1)
++		return 0;
++
++	ipts->mode = mode;
++	return ipts_control_restart(ipts);
++}
++
++static int ipts_hid_parse(struct hid_device *hid)
++{
++	int ret = 0;
++	struct ipts_context *ipts = NULL;
++
++	bool has_native_descriptor = false;
++
++	u8 *buffer = NULL;
++	size_t size = 0;
++
++	if (!hid)
++		return -ENODEV;
++
++	ipts = hid->driver_data;
++
++	if (!ipts)
++		return -EFAULT;
++
++	size = sizeof(ipts_singletouch_descriptor);
++	has_native_descriptor = ipts->descriptor.address && ipts->descriptor.size > 0;
++
++	if (has_native_descriptor)
++		size += ipts->descriptor.size;
++	else
++		size += sizeof(ipts_fallback_descriptor);
++
++	buffer = kzalloc(size, GFP_KERNEL);
++	if (!buffer)
++		return -ENOMEM;
++
++	memcpy(buffer, ipts_singletouch_descriptor, sizeof(ipts_singletouch_descriptor));
++
++	if (has_native_descriptor) {
++		memcpy(&buffer[sizeof(ipts_singletouch_descriptor)], ipts->descriptor.address,
++		       ipts->descriptor.size);
++	} else {
++		memcpy(&buffer[sizeof(ipts_singletouch_descriptor)], ipts_fallback_descriptor,
++		       sizeof(ipts_fallback_descriptor));
++	}
++
++	ret = hid_parse_report(hid, buffer, size);
++	kfree(buffer);
++
++	if (ret) {
++		dev_err(ipts->dev, "Failed to parse HID descriptor: %d\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++static int ipts_hid_get_feature(struct ipts_context *ipts, unsigned char reportnum, __u8 *buf,
++				size_t size, enum ipts_feedback_data_type type)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!buf)
++		return -EFAULT;
++
++	mutex_lock(&ipts->feature_lock);
++
++	memset(buf, 0, size);
++	buf[0] = reportnum;
++
++	memset(&ipts->feature_report, 0, sizeof(ipts->feature_report));
++	reinit_completion(&ipts->feature_event);
++
++	ret = ipts_control_hid2me_feedback(ipts, IPTS_FEEDBACK_CMD_TYPE_NONE, type, buf, size);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to send hid2me feedback: %d\n", ret);
++		goto out;
++	}
++
++	ret = wait_for_completion_timeout(&ipts->feature_event, msecs_to_jiffies(5000));
++	if (ret == 0) {
++		dev_warn(ipts->dev, "GET_FEATURES timed out!\n");
++		ret = -EIO;
++		goto out;
++	}
++
++	if (!ipts->feature_report.address) {
++		ret = -EFAULT;
++		goto out;
++	}
++
++	if (ipts->feature_report.size > size) {
++		ret = -ETOOSMALL;
++		goto out;
++	}
++
++	ret = ipts->feature_report.size;
++	memcpy(buf, ipts->feature_report.address, ipts->feature_report.size);
++
++out:
++	mutex_unlock(&ipts->feature_lock);
++	return ret;
++}
++
++static int ipts_hid_set_feature(struct ipts_context *ipts, unsigned char reportnum, __u8 *buf,
++				size_t size, enum ipts_feedback_data_type type)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!buf)
++		return -EFAULT;
++
++	buf[0] = reportnum;
++
++	ret = ipts_control_hid2me_feedback(ipts, IPTS_FEEDBACK_CMD_TYPE_NONE, type, buf, size);
++	if (ret)
++		dev_err(ipts->dev, "Failed to send hid2me feedback: %d\n", ret);
++
++	return ret;
++}
++
++static int ipts_hid_raw_request(struct hid_device *hid, unsigned char reportnum, __u8 *buf,
++				size_t size, unsigned char rtype, int reqtype)
++{
++	int ret = 0;
++	struct ipts_context *ipts = NULL;
++
++	enum ipts_feedback_data_type type = IPTS_FEEDBACK_DATA_TYPE_VENDOR;
++
++	if (!hid)
++		return -ENODEV;
++
++	ipts = hid->driver_data;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!buf)
++		return -EFAULT;
++
++	if (rtype == HID_OUTPUT_REPORT && reqtype == HID_REQ_SET_REPORT)
++		type = IPTS_FEEDBACK_DATA_TYPE_OUTPUT_REPORT;
++	else if (rtype == HID_FEATURE_REPORT && reqtype == HID_REQ_GET_REPORT)
++		type = IPTS_FEEDBACK_DATA_TYPE_GET_FEATURES;
++	else if (rtype == HID_FEATURE_REPORT && reqtype == HID_REQ_SET_REPORT)
++		type = IPTS_FEEDBACK_DATA_TYPE_SET_FEATURES;
++	else
++		return -EIO;
++
++	// Implemente mode switching report for older devices without native HID support
++	if (type == IPTS_FEEDBACK_DATA_TYPE_SET_FEATURES && reportnum == IPTS_HID_REPORT_SET_MODE) {
++		ret = ipts_hid_switch_mode(ipts, buf[1]);
++		if (ret) {
++			dev_err(ipts->dev, "Failed to switch modes: %d\n", ret);
++			return ret;
++		}
++	}
++
++	if (reqtype == HID_REQ_GET_REPORT)
++		return ipts_hid_get_feature(ipts, reportnum, buf, size, type);
++	else
++		return ipts_hid_set_feature(ipts, reportnum, buf, size, type);
++}
++
++static int ipts_hid_output_report(struct hid_device *hid, __u8 *data, size_t size)
++{
++	struct ipts_context *ipts = NULL;
++
++	if (!hid)
++		return -ENODEV;
++
++	ipts = hid->driver_data;
++
++	return ipts_control_hid2me_feedback(ipts, IPTS_FEEDBACK_CMD_TYPE_NONE,
++					    IPTS_FEEDBACK_DATA_TYPE_OUTPUT_REPORT, data, size);
++}
++
++static struct hid_ll_driver ipts_hid_driver = {
++	.start = ipts_hid_start,
++	.stop = ipts_hid_stop,
++	.open = ipts_hid_start,
++	.close = ipts_hid_stop,
++	.parse = ipts_hid_parse,
++	.raw_request = ipts_hid_raw_request,
++	.output_report = ipts_hid_output_report,
++};
++
++int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer)
++{
++	int ret = 0;
++	u8 *temp = NULL;
++	struct ipts_hid_header *frame = NULL;
++	struct ipts_data_header *header = NULL;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (!ipts->hid)
++		return -ENODEV;
++
++	header = (struct ipts_data_header *)ipts->resources.data[buffer].address;
++
++	if (!header)
++		return -EFAULT;
++
++	if (header->size == 0)
++		return 0;
++
++	if (header->type == IPTS_DATA_TYPE_HID)
++		return hid_input_report(ipts->hid, HID_INPUT_REPORT, header->data, header->size, 1);
++
++	if (header->type == IPTS_DATA_TYPE_GET_FEATURES) {
++		ipts->feature_report.address = header->data;
++		ipts->feature_report.size = header->size;
++
++		complete_all(&ipts->feature_event);
++		return 0;
++	}
++
++	if (header->type != IPTS_DATA_TYPE_FRAME)
++		return 0;
++
++	if (header->size + 3 + sizeof(struct ipts_hid_header) > IPTS_HID_REPORT_DATA_SIZE)
++		return -ERANGE;
++
++	temp = kzalloc(IPTS_HID_REPORT_DATA_SIZE, GFP_KERNEL);
++	if (!temp)
++		return -ENOMEM;
++
++	/*
++	 * Synthesize a HID report matching the devices that natively send HID reports
++	 */
++	temp[0] = IPTS_HID_REPORT_DATA;
++
++	frame = (struct ipts_hid_header *)&temp[3];
++	frame->type = IPTS_HID_FRAME_TYPE_RAW;
++	frame->size = header->size + sizeof(*frame);
++
++	memcpy(frame->data, header->data, header->size);
++
++	ret = hid_input_report(ipts->hid, HID_INPUT_REPORT, temp, IPTS_HID_REPORT_DATA_SIZE, 1);
++	kfree(temp);
++
++	return ret;
++}
++
++int ipts_hid_init(struct ipts_context *ipts, struct ipts_device_info info)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (ipts->hid)
++		return 0;
++
++	ipts->hid = hid_allocate_device();
++	if (IS_ERR(ipts->hid)) {
++		int err = PTR_ERR(ipts->hid);
++
++		dev_err(ipts->dev, "Failed to allocate HID device: %d\n", err);
++		return err;
++	}
++
++	ipts->hid->driver_data = ipts;
++	ipts->hid->dev.parent = ipts->dev;
++	ipts->hid->ll_driver = &ipts_hid_driver;
++
++	ipts->hid->vendor = info.vendor;
++	ipts->hid->product = info.product;
++	ipts->hid->group = HID_GROUP_MULTITOUCH;
++
++	snprintf(ipts->hid->name, sizeof(ipts->hid->name), "IPTS %04X:%04X", info.vendor,
++		 info.product);
++
++	ret = hid_add_device(ipts->hid);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to add HID device: %d\n", ret);
++		ipts_hid_free(ipts);
++		return ret;
++	}
++
++	return 0;
++}
++
++int ipts_hid_free(struct ipts_context *ipts)
++{
++	if (!ipts)
++		return -EFAULT;
++
++	if (!ipts->hid)
++		return 0;
++
++	hid_destroy_device(ipts->hid);
++	ipts->hid = NULL;
++
++	return 0;
++}
+diff --git a/drivers/hid/ipts/hid.h b/drivers/hid/ipts/hid.h
+new file mode 100644
+index 000000000000..62bf3cd48608
+--- /dev/null
++++ b/drivers/hid/ipts/hid.h
+@@ -0,0 +1,22 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2022-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_HID_H
++#define IPTS_HID_H
++
++#include <linux/types.h>
++
++#include "context.h"
++#include "spec-device.h"
++
++int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer);
++
++int ipts_hid_init(struct ipts_context *ipts, struct ipts_device_info info);
++int ipts_hid_free(struct ipts_context *ipts);
++
++#endif /* IPTS_HID_H */
+diff --git a/drivers/hid/ipts/main.c b/drivers/hid/ipts/main.c
+new file mode 100644
+index 000000000000..0f20c6c08c38
+--- /dev/null
++++ b/drivers/hid/ipts/main.c
+@@ -0,0 +1,127 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/completion.h>
++#include <linux/delay.h>
++#include <linux/device.h>
++#include <linux/dma-mapping.h>
++#include <linux/mei_cl_bus.h>
++#include <linux/mod_devicetable.h>
++#include <linux/module.h>
++#include <linux/mutex.h>
++#include <linux/slab.h>
++#include <linux/stddef.h>
++#include <linux/types.h>
++
++#include "context.h"
++#include "control.h"
++#include "mei.h"
++#include "receiver.h"
++#include "spec-device.h"
++
++/*
++ * The MEI client ID for IPTS functionality.
++ */
++#define IPTS_ID UUID_LE(0x3e8d0870, 0x271a, 0x4208, 0x8e, 0xb5, 0x9a, 0xcb, 0x94, 0x02, 0xae, 0x04)
++
++static int ipts_set_dma_mask(struct mei_cl_device *cldev)
++{
++	if (!cldev)
++		return -EFAULT;
++
++	if (!dma_coerce_mask_and_coherent(&cldev->dev, DMA_BIT_MASK(64)))
++		return 0;
++
++	return dma_coerce_mask_and_coherent(&cldev->dev, DMA_BIT_MASK(32));
++}
++
++static int ipts_probe(struct mei_cl_device *cldev, const struct mei_cl_device_id *id)
++{
++	int ret = 0;
++	struct ipts_context *ipts = NULL;
++
++	if (!cldev)
++		return -EFAULT;
++
++	ret = ipts_set_dma_mask(cldev);
++	if (ret) {
++		dev_err(&cldev->dev, "Failed to set DMA mask for IPTS: %d\n", ret);
++		return ret;
++	}
++
++	ret = mei_cldev_enable(cldev);
++	if (ret) {
++		dev_err(&cldev->dev, "Failed to enable MEI device: %d\n", ret);
++		return ret;
++	}
++
++	ipts = devm_kzalloc(&cldev->dev, sizeof(*ipts), GFP_KERNEL);
++	if (!ipts) {
++		mei_cldev_disable(cldev);
++		return -ENOMEM;
++	}
++
++	ret = ipts_mei_init(&ipts->mei, cldev);
++	if (ret) {
++		dev_err(&cldev->dev, "Failed to init MEI bus logic: %d\n", ret);
++		return ret;
++	}
++
++	ipts->dev = &cldev->dev;
++	ipts->mode = IPTS_MODE_EVENT;
++
++	mutex_init(&ipts->feature_lock);
++	init_completion(&ipts->feature_event);
++
++	mei_cldev_set_drvdata(cldev, ipts);
++
++	ret = ipts_control_start(ipts);
++	if (ret) {
++		dev_err(&cldev->dev, "Failed to start IPTS: %d\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++static void ipts_remove(struct mei_cl_device *cldev)
++{
++	int ret = 0;
++	struct ipts_context *ipts = NULL;
++
++	if (!cldev) {
++		pr_err("MEI device is NULL!");
++		return;
++	}
++
++	ipts = mei_cldev_get_drvdata(cldev);
++
++	ret = ipts_control_stop(ipts);
++	if (ret)
++		dev_err(&cldev->dev, "Failed to stop IPTS: %d\n", ret);
++
++	mei_cldev_disable(cldev);
++}
++
++static struct mei_cl_device_id ipts_device_id_table[] = {
++	{ .uuid = IPTS_ID, .version = MEI_CL_VERSION_ANY },
++	{},
++};
++MODULE_DEVICE_TABLE(mei, ipts_device_id_table);
++
++static struct mei_cl_driver ipts_driver = {
++	.id_table = ipts_device_id_table,
++	.name = "ipts",
++	.probe = ipts_probe,
++	.remove = ipts_remove,
++};
++module_mei_cl_driver(ipts_driver);
++
++MODULE_DESCRIPTION("IPTS touchscreen driver");
++MODULE_AUTHOR("Dorian Stoll <dorian.stoll@tmsp.io>");
++MODULE_LICENSE("GPL");
+diff --git a/drivers/hid/ipts/mei.c b/drivers/hid/ipts/mei.c
+new file mode 100644
+index 000000000000..26666fd99b0c
+--- /dev/null
++++ b/drivers/hid/ipts/mei.c
+@@ -0,0 +1,189 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/device.h>
++#include <linux/errno.h>
++#include <linux/jiffies.h>
++#include <linux/list.h>
++#include <linux/mei_cl_bus.h>
++#include <linux/printk.h>
++#include <linux/rwsem.h>
++#include <linux/types.h>
++#include <linux/wait.h>
++
++#include "context.h"
++#include "mei.h"
++
++static void locked_list_add(struct list_head *new, struct list_head *head,
++			    struct rw_semaphore *lock)
++{
++	down_write(lock);
++	list_add(new, head);
++	up_write(lock);
++}
++
++static void locked_list_del(struct list_head *entry, struct rw_semaphore *lock)
++{
++	down_write(lock);
++	list_del(entry);
++	up_write(lock);
++}
++
++static void ipts_mei_incoming(struct mei_cl_device *cldev)
++{
++	ssize_t ret = 0;
++	struct ipts_mei_message *entry = NULL;
++	struct ipts_context *ipts = NULL;
++
++	if (!cldev) {
++		pr_err("MEI device is NULL!");
++		return;
++	}
++
++	ipts = mei_cldev_get_drvdata(cldev);
++	if (!ipts) {
++		pr_err("IPTS driver context is NULL!");
++		return;
++	}
++
++	entry = devm_kzalloc(ipts->dev, sizeof(*entry), GFP_KERNEL);
++	if (!entry)
++		return;
++
++	INIT_LIST_HEAD(&entry->list);
++
++	do {
++		ret = mei_cldev_recv(cldev, (u8 *)&entry->rsp, sizeof(entry->rsp));
++	} while (ret == -EINTR);
++
++	if (ret < 0) {
++		dev_err(ipts->dev, "Error while reading response: %ld\n", ret);
++		return;
++	}
++
++	if (ret == 0) {
++		dev_err(ipts->dev, "Received empty response\n");
++		return;
++	}
++
++	locked_list_add(&entry->list, &ipts->mei.messages, &ipts->mei.message_lock);
++	wake_up_all(&ipts->mei.message_queue);
++}
++
++static int ipts_mei_search(struct ipts_mei *mei, enum ipts_command_code code,
++			   struct ipts_response *rsp)
++{
++	struct ipts_mei_message *entry = NULL;
++
++	if (!mei)
++		return -EFAULT;
++
++	if (!rsp)
++		return -EFAULT;
++
++	down_read(&mei->message_lock);
++
++	/*
++	 * Iterate over the list of received messages, and check if there is one
++	 * matching the requested command code.
++	 */
++	list_for_each_entry(entry, &mei->messages, list) {
++		if (entry->rsp.cmd == code)
++			break;
++	}
++
++	up_read(&mei->message_lock);
++
++	/*
++	 * If entry is not the list head, this means that the loop above has been stopped early,
++	 * and that we found a matching element. We drop the message from the list and return it.
++	 */
++	if (!list_entry_is_head(entry, &mei->messages, list)) {
++		locked_list_del(&entry->list, &mei->message_lock);
++
++		*rsp = entry->rsp;
++		devm_kfree(&mei->cldev->dev, entry);
++
++		return 0;
++	}
++
++	return -EAGAIN;
++}
++
++int ipts_mei_recv(struct ipts_mei *mei, enum ipts_command_code code, struct ipts_response *rsp,
++		  u64 timeout)
++{
++	int ret = 0;
++
++	if (!mei)
++		return -EFAULT;
++
++	/*
++	 * A timeout of 0 means check and return immideately.
++	 */
++	if (timeout == 0)
++		return ipts_mei_search(mei, code, rsp);
++
++	/*
++	 * A timeout of less than 0 means to wait forever.
++	 */
++	if (timeout < 0) {
++		wait_event(mei->message_queue, ipts_mei_search(mei, code, rsp) == 0);
++		return 0;
++	}
++
++	ret = wait_event_timeout(mei->message_queue, ipts_mei_search(mei, code, rsp) == 0,
++				 msecs_to_jiffies(timeout));
++
++	if (ret > 0)
++		return 0;
++
++	return -EAGAIN;
++}
++
++int ipts_mei_send(struct ipts_mei *mei, void *data, size_t length)
++{
++	int ret = 0;
++
++	if (!mei)
++		return -EFAULT;
++
++	if (!mei->cldev)
++		return -EFAULT;
++
++	if (!data)
++		return -EFAULT;
++
++	do {
++		ret = mei_cldev_send(mei->cldev, (u8 *)data, length);
++	} while (ret == -EINTR);
++
++	if (ret < 0)
++		return ret;
++
++	return 0;
++}
++
++int ipts_mei_init(struct ipts_mei *mei, struct mei_cl_device *cldev)
++{
++	if (!mei)
++		return -EFAULT;
++
++	if (!cldev)
++		return -EFAULT;
++
++	mei->cldev = cldev;
++
++	INIT_LIST_HEAD(&mei->messages);
++	init_waitqueue_head(&mei->message_queue);
++	init_rwsem(&mei->message_lock);
++
++	mei_cldev_register_rx_cb(cldev, ipts_mei_incoming);
++
++	return 0;
++}
+diff --git a/drivers/hid/ipts/mei.h b/drivers/hid/ipts/mei.h
+new file mode 100644
+index 000000000000..eadacae54c40
+--- /dev/null
++++ b/drivers/hid/ipts/mei.h
+@@ -0,0 +1,67 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_MEI_H
++#define IPTS_MEI_H
++
++#include <linux/list.h>
++#include <linux/mei_cl_bus.h>
++#include <linux/rwsem.h>
++#include <linux/types.h>
++#include <linux/wait.h>
++
++#include "spec-device.h"
++
++struct ipts_mei_message {
++	struct list_head list;
++	struct ipts_response rsp;
++};
++
++struct ipts_mei {
++	struct mei_cl_device *cldev;
++
++	struct list_head messages;
++
++	wait_queue_head_t message_queue;
++	struct rw_semaphore message_lock;
++};
++
++/*
++ * ipts_mei_recv() - Receive data from a MEI device.
++ * @mei: The IPTS MEI device context.
++ * @code: The IPTS command code to look for.
++ * @rsp: The address that the received data will be copied to.
++ * @timeout: How many milliseconds the function will wait at most.
++ *
++ * A negative timeout means to wait forever.
++ *
++ * Returns: 0 on success, <0 on error, -EAGAIN if no response has been received.
++ */
++int ipts_mei_recv(struct ipts_mei *mei, enum ipts_command_code code, struct ipts_response *rsp,
++		  u64 timeout);
++
++/*
++ * ipts_mei_send() - Send data to a MEI device.
++ * @ipts: The IPTS MEI device context.
++ * @data: The data to send.
++ * @size: The size of the data.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_mei_send(struct ipts_mei *mei, void *data, size_t length);
++
++/*
++ * ipts_mei_init() - Initialize the MEI device context.
++ * @mei: The MEI device context to initialize.
++ * @cldev: The MEI device the context will be bound to.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_mei_init(struct ipts_mei *mei, struct mei_cl_device *cldev);
++
++#endif /* IPTS_MEI_H */
+diff --git a/drivers/hid/ipts/receiver.c b/drivers/hid/ipts/receiver.c
+new file mode 100644
+index 000000000000..77234f9e0e17
+--- /dev/null
++++ b/drivers/hid/ipts/receiver.c
+@@ -0,0 +1,249 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/delay.h>
++#include <linux/err.h>
++#include <linux/kthread.h>
++#include <linux/time64.h>
++#include <linux/timekeeping.h>
++#include <linux/types.h>
++
++#include "cmd.h"
++#include "context.h"
++#include "control.h"
++#include "hid.h"
++#include "resources.h"
++#include "spec-device.h"
++#include "thread.h"
++
++static void ipts_receiver_next_doorbell(struct ipts_context *ipts)
++{
++	u32 *doorbell = (u32 *)ipts->resources.doorbell.address;
++	*doorbell = *doorbell + 1;
++}
++
++static u32 ipts_receiver_current_doorbell(struct ipts_context *ipts)
++{
++	u32 *doorbell = (u32 *)ipts->resources.doorbell.address;
++	return *doorbell;
++}
++
++static void ipts_receiver_backoff(time64_t last, u32 n)
++{
++	/*
++	 * If the last change was less than n seconds ago,
++	 * sleep for a shorter period so that new data can be
++	 * processed quickly. If there was no change for more than
++	 * n seconds, sleep longer to avoid wasting CPU cycles.
++	 */
++	if (last + n > ktime_get_seconds())
++		msleep(20);
++	else
++		msleep(200);
++}
++
++static int ipts_receiver_event_loop(struct ipts_thread *thread)
++{
++	int ret = 0;
++	u32 buffer = 0;
++
++	struct ipts_context *ipts = NULL;
++	time64_t last = ktime_get_seconds();
++
++	if (!thread)
++		return -EFAULT;
++
++	ipts = thread->data;
++
++	if (!ipts)
++		return -EFAULT;
++
++	dev_info(ipts->dev, "IPTS running in event mode\n");
++
++	while (!ipts_thread_should_stop(thread)) {
++		for (int i = 0; i < IPTS_BUFFERS; i++) {
++			ret = ipts_control_wait_data(ipts, false);
++			if (ret == -EAGAIN)
++				break;
++
++			if (ret) {
++				dev_err(ipts->dev, "Failed to wait for data: %d\n", ret);
++				continue;
++			}
++
++			buffer = ipts_receiver_current_doorbell(ipts) % IPTS_BUFFERS;
++			ipts_receiver_next_doorbell(ipts);
++
++			ret = ipts_hid_input_data(ipts, buffer);
++			if (ret)
++				dev_err(ipts->dev, "Failed to process buffer: %d\n", ret);
++
++			ret = ipts_control_refill_buffer(ipts, buffer);
++			if (ret)
++				dev_err(ipts->dev, "Failed to send feedback: %d\n", ret);
++
++			ret = ipts_control_request_data(ipts);
++			if (ret)
++				dev_err(ipts->dev, "Failed to request data: %d\n", ret);
++
++			last = ktime_get_seconds();
++		}
++
++		ipts_receiver_backoff(last, 5);
++	}
++
++	ret = ipts_control_request_flush(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to request flush: %d\n", ret);
++		return ret;
++	}
++
++	ret = ipts_control_wait_data(ipts, true);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to wait for data: %d\n", ret);
++
++		if (ret != -EAGAIN)
++			return ret;
++		else
++			return 0;
++	}
++
++	ret = ipts_control_wait_flush(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to wait for flush: %d\n", ret);
++
++		if (ret != -EAGAIN)
++			return ret;
++		else
++			return 0;
++	}
++
++	return 0;
++}
++
++static int ipts_receiver_doorbell_loop(struct ipts_thread *thread)
++{
++	int ret = 0;
++	u32 buffer = 0;
++
++	u32 doorbell = 0;
++	u32 lastdb = 0;
++
++	struct ipts_context *ipts = NULL;
++	time64_t last = ktime_get_seconds();
++
++	if (!thread)
++		return -EFAULT;
++
++	ipts = thread->data;
++
++	if (!ipts)
++		return -EFAULT;
++
++	dev_info(ipts->dev, "IPTS running in doorbell mode\n");
++
++	while (true) {
++		if (ipts_thread_should_stop(thread)) {
++			ret = ipts_control_request_flush(ipts);
++			if (ret) {
++				dev_err(ipts->dev, "Failed to request flush: %d\n", ret);
++				return ret;
++			}
++		}
++
++		doorbell = ipts_receiver_current_doorbell(ipts);
++
++		/*
++		 * After filling up one of the data buffers, IPTS will increment
++		 * the doorbell. The value of the doorbell stands for the *next*
++		 * buffer that IPTS is going to fill.
++		 */
++		while (lastdb != doorbell) {
++			buffer = lastdb % IPTS_BUFFERS;
++
++			ret = ipts_hid_input_data(ipts, buffer);
++			if (ret)
++				dev_err(ipts->dev, "Failed to process buffer: %d\n", ret);
++
++			ret = ipts_control_refill_buffer(ipts, buffer);
++			if (ret)
++				dev_err(ipts->dev, "Failed to send feedback: %d\n", ret);
++
++			last = ktime_get_seconds();
++			lastdb++;
++		}
++
++		if (ipts_thread_should_stop(thread))
++			break;
++
++		ipts_receiver_backoff(last, 5);
++	}
++
++	ret = ipts_control_wait_data(ipts, true);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to wait for data: %d\n", ret);
++
++		if (ret != -EAGAIN)
++			return ret;
++		else
++			return 0;
++	}
++
++	ret = ipts_control_wait_flush(ipts);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to wait for flush: %d\n", ret);
++
++		if (ret != -EAGAIN)
++			return ret;
++		else
++			return 0;
++	}
++
++	return 0;
++}
++
++int ipts_receiver_start(struct ipts_context *ipts)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	if (ipts->mode == IPTS_MODE_EVENT) {
++		ret = ipts_thread_start(&ipts->receiver_loop, ipts_receiver_event_loop, ipts,
++					"ipts_event");
++	} else if (ipts->mode == IPTS_MODE_DOORBELL) {
++		ret = ipts_thread_start(&ipts->receiver_loop, ipts_receiver_doorbell_loop, ipts,
++					"ipts_doorbell");
++	} else {
++		ret = -EINVAL;
++	}
++
++	if (ret) {
++		dev_err(ipts->dev, "Failed to start receiver loop: %d\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
++
++int ipts_receiver_stop(struct ipts_context *ipts)
++{
++	int ret = 0;
++
++	if (!ipts)
++		return -EFAULT;
++
++	ret = ipts_thread_stop(&ipts->receiver_loop);
++	if (ret) {
++		dev_err(ipts->dev, "Failed to stop receiver loop: %d\n", ret);
++		return ret;
++	}
++
++	return 0;
++}
+diff --git a/drivers/hid/ipts/receiver.h b/drivers/hid/ipts/receiver.h
+new file mode 100644
+index 000000000000..96070f34fbca
+--- /dev/null
++++ b/drivers/hid/ipts/receiver.h
+@@ -0,0 +1,17 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_RECEIVER_H
++#define IPTS_RECEIVER_H
++
++#include "context.h"
++
++int ipts_receiver_start(struct ipts_context *ipts);
++int ipts_receiver_stop(struct ipts_context *ipts);
++
++#endif /* IPTS_RECEIVER_H */
+diff --git a/drivers/hid/ipts/resources.c b/drivers/hid/ipts/resources.c
+new file mode 100644
+index 000000000000..80ba5885bb55
+--- /dev/null
++++ b/drivers/hid/ipts/resources.c
+@@ -0,0 +1,108 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/dma-mapping.h>
++#include <linux/types.h>
++
++#include "resources.h"
++#include "spec-device.h"
++
++static int ipts_resources_alloc_buffer(struct ipts_buffer *buffer, struct device *dev, size_t size)
++{
++	if (!buffer)
++		return -EFAULT;
++
++	if (buffer->address)
++		return 0;
++
++	buffer->address = dma_alloc_coherent(dev, size, &buffer->dma_address, GFP_KERNEL);
++
++	if (!buffer->address)
++		return -ENOMEM;
++
++	buffer->size = size;
++	buffer->device = dev;
++
++	return 0;
++}
++
++static void ipts_resources_free_buffer(struct ipts_buffer *buffer)
++{
++	if (!buffer->address)
++		return;
++
++	dma_free_coherent(buffer->device, buffer->size, buffer->address, buffer->dma_address);
++
++	buffer->address = NULL;
++	buffer->size = 0;
++
++	buffer->dma_address = 0;
++	buffer->device = NULL;
++}
++
++int ipts_resources_init(struct ipts_resources *res, struct device *dev, size_t ds, size_t fs)
++{
++	int ret = 0;
++
++	if (!res)
++		return -EFAULT;
++
++	for (int i = 0; i < IPTS_BUFFERS; i++) {
++		ret = ipts_resources_alloc_buffer(&res->data[i], dev, ds);
++		if (ret)
++			goto err;
++	}
++
++	for (int i = 0; i < IPTS_BUFFERS; i++) {
++		ret = ipts_resources_alloc_buffer(&res->feedback[i], dev, fs);
++		if (ret)
++			goto err;
++	}
++
++	ret = ipts_resources_alloc_buffer(&res->doorbell, dev, sizeof(u32));
++	if (ret)
++		goto err;
++
++	ret = ipts_resources_alloc_buffer(&res->workqueue, dev, sizeof(u32));
++	if (ret)
++		goto err;
++
++	ret = ipts_resources_alloc_buffer(&res->hid2me, dev, fs);
++	if (ret)
++		goto err;
++
++	ret = ipts_resources_alloc_buffer(&res->descriptor, dev, ds + 8);
++	if (ret)
++		goto err;
++
++	return 0;
++
++err:
++
++	ipts_resources_free(res);
++	return ret;
++}
++
++int ipts_resources_free(struct ipts_resources *res)
++{
++	if (!res)
++		return -EFAULT;
++
++	for (int i = 0; i < IPTS_BUFFERS; i++)
++		ipts_resources_free_buffer(&res->data[i]);
++
++	for (int i = 0; i < IPTS_BUFFERS; i++)
++		ipts_resources_free_buffer(&res->feedback[i]);
++
++	ipts_resources_free_buffer(&res->doorbell);
++	ipts_resources_free_buffer(&res->workqueue);
++	ipts_resources_free_buffer(&res->hid2me);
++	ipts_resources_free_buffer(&res->descriptor);
++
++	return 0;
++}
+diff --git a/drivers/hid/ipts/resources.h b/drivers/hid/ipts/resources.h
+new file mode 100644
+index 000000000000..6cbb24a8a054
+--- /dev/null
++++ b/drivers/hid/ipts/resources.h
+@@ -0,0 +1,39 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_RESOURCES_H
++#define IPTS_RESOURCES_H
++
++#include <linux/device.h>
++#include <linux/types.h>
++
++#include "spec-device.h"
++
++struct ipts_buffer {
++	u8 *address;
++	size_t size;
++
++	dma_addr_t dma_address;
++	struct device *device;
++};
++
++struct ipts_resources {
++	struct ipts_buffer data[IPTS_BUFFERS];
++	struct ipts_buffer feedback[IPTS_BUFFERS];
++
++	struct ipts_buffer doorbell;
++	struct ipts_buffer workqueue;
++	struct ipts_buffer hid2me;
++
++	struct ipts_buffer descriptor;
++};
++
++int ipts_resources_init(struct ipts_resources *res, struct device *dev, size_t ds, size_t fs);
++int ipts_resources_free(struct ipts_resources *res);
++
++#endif /* IPTS_RESOURCES_H */
+diff --git a/drivers/hid/ipts/spec-data.h b/drivers/hid/ipts/spec-data.h
+new file mode 100644
+index 000000000000..e8dd98895a7e
+--- /dev/null
++++ b/drivers/hid/ipts/spec-data.h
+@@ -0,0 +1,100 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_SPEC_DATA_H
++#define IPTS_SPEC_DATA_H
++
++#include <linux/build_bug.h>
++#include <linux/types.h>
++
++/**
++ * enum ipts_feedback_cmd_type - Commands that can be executed on the sensor through feedback.
++ */
++enum ipts_feedback_cmd_type {
++	IPTS_FEEDBACK_CMD_TYPE_NONE = 0,
++	IPTS_FEEDBACK_CMD_TYPE_SOFT_RESET = 1,
++	IPTS_FEEDBACK_CMD_TYPE_GOTO_ARMED = 2,
++	IPTS_FEEDBACK_CMD_TYPE_GOTO_SENSING = 3,
++	IPTS_FEEDBACK_CMD_TYPE_GOTO_SLEEP = 4,
++	IPTS_FEEDBACK_CMD_TYPE_GOTO_DOZE = 5,
++	IPTS_FEEDBACK_CMD_TYPE_HARD_RESET = 6,
++};
++
++/**
++ * enum ipts_feedback_data_type - Defines what data a feedback buffer contains.
++ * @IPTS_FEEDBACK_DATA_TYPE_VENDOR:        The buffer contains vendor specific feedback.
++ * @IPTS_FEEDBACK_DATA_TYPE_SET_FEATURES:  The buffer contains a HID set features report.
++ * @IPTS_FEEDBACK_DATA_TYPE_GET_FEATURES:  The buffer contains a HID get features report.
++ * @IPTS_FEEDBACK_DATA_TYPE_OUTPUT_REPORT: The buffer contains a HID output report.
++ * @IPTS_FEEDBACK_DATA_TYPE_STORE_DATA:    The buffer contains calibration data for the sensor.
++ */
++enum ipts_feedback_data_type {
++	IPTS_FEEDBACK_DATA_TYPE_VENDOR = 0,
++	IPTS_FEEDBACK_DATA_TYPE_SET_FEATURES = 1,
++	IPTS_FEEDBACK_DATA_TYPE_GET_FEATURES = 2,
++	IPTS_FEEDBACK_DATA_TYPE_OUTPUT_REPORT = 3,
++	IPTS_FEEDBACK_DATA_TYPE_STORE_DATA = 4,
++};
++
++/**
++ * struct ipts_feedback_header - Header that is prefixed to the data in a feedback buffer.
++ * @cmd_type:   A command that should be executed on the sensor.
++ * @size:       The size of the payload to be written.
++ * @buffer:     The ID of the buffer that contains this feedback data.
++ * @protocol:   The protocol version of the EDS.
++ * @data_type:  The type of data that the buffer contains.
++ * @spi_offset: The offset at which to write the payload data to the sensor.
++ * @payload:    Payload for the feedback command, or 0 if no payload is sent.
++ */
++struct ipts_feedback_header {
++	enum ipts_feedback_cmd_type cmd_type;
++	u32 size;
++	u32 buffer;
++	u32 protocol;
++	enum ipts_feedback_data_type data_type;
++	u32 spi_offset;
++	u8 reserved[40];
++	u8 payload[];
++} __packed;
++
++static_assert(sizeof(struct ipts_feedback_header) == 64);
++
++/**
++ * enum ipts_data_type - Defines what type of data a buffer contains.
++ * @IPTS_DATA_TYPE_FRAME:        Raw data frame.
++ * @IPTS_DATA_TYPE_ERROR:        Error data.
++ * @IPTS_DATA_TYPE_VENDOR:       Vendor specific data.
++ * @IPTS_DATA_TYPE_HID:          A HID report.
++ * @IPTS_DATA_TYPE_GET_FEATURES: The response to a GET_FEATURES HID2ME command.
++ */
++enum ipts_data_type {
++	IPTS_DATA_TYPE_FRAME = 0x00,
++	IPTS_DATA_TYPE_ERROR = 0x01,
++	IPTS_DATA_TYPE_VENDOR = 0x02,
++	IPTS_DATA_TYPE_HID = 0x03,
++	IPTS_DATA_TYPE_GET_FEATURES = 0x04,
++	IPTS_DATA_TYPE_DESCRIPTOR = 0x05,
++};
++
++/**
++ * struct ipts_data_header - Header that is prefixed to the data in a data buffer.
++ * @type: What data the buffer contains.
++ * @size: How much data the buffer contains.
++ * @buffer: Which buffer the data is in.
++ */
++struct ipts_data_header {
++	enum ipts_data_type type;
++	u32 size;
++	u32 buffer;
++	u8 reserved[52];
++	u8 data[];
++} __packed;
++
++static_assert(sizeof(struct ipts_data_header) == 64);
++
++#endif /* IPTS_SPEC_DATA_H */
+diff --git a/drivers/hid/ipts/spec-device.h b/drivers/hid/ipts/spec-device.h
+new file mode 100644
+index 000000000000..93f673d981f7
+--- /dev/null
++++ b/drivers/hid/ipts/spec-device.h
+@@ -0,0 +1,285 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_SPEC_DEVICE_H
++#define IPTS_SPEC_DEVICE_H
++
++#include <linux/build_bug.h>
++#include <linux/types.h>
++
++/*
++ * The amount of buffers that IPTS can use for data transfer.
++ */
++#define IPTS_BUFFERS 16
++
++/*
++ * The buffer ID that is used for HID2ME feedback
++ */
++#define IPTS_HID2ME_BUFFER IPTS_BUFFERS
++
++/**
++ * enum ipts_command - Commands that can be sent to the IPTS hardware.
++ * @IPTS_CMD_GET_DEVICE_INFO:  Retrieves vendor information from the device.
++ * @IPTS_CMD_SET_MODE:         Changes the mode that the device will operate in.
++ * @IPTS_CMD_SET_MEM_WINDOW:   Configures memory buffers for passing data between device and driver.
++ * @IPTS_CMD_QUIESCE_IO:       Stops the data flow from the device to the driver.
++ * @IPTS_CMD_READY_FOR_DATA:   Informs the device that the driver is ready to receive data.
++ * @IPTS_CMD_FEEDBACK:         Informs the device that a buffer was processed and can be refilled.
++ * @IPTS_CMD_CLEAR_MEM_WINDOW: Stops the data flow and clears the buffer addresses on the device.
++ * @IPTS_CMD_RESET_SENSOR:     Resets the sensor to its default state.
++ * @IPTS_CMD_GET_DESCRIPTOR:   Retrieves the HID descriptor of the device.
++ */
++enum ipts_command_code {
++	IPTS_CMD_GET_DEVICE_INFO = 0x01,
++	IPTS_CMD_SET_MODE = 0x02,
++	IPTS_CMD_SET_MEM_WINDOW = 0x03,
++	IPTS_CMD_QUIESCE_IO = 0x04,
++	IPTS_CMD_READY_FOR_DATA = 0x05,
++	IPTS_CMD_FEEDBACK = 0x06,
++	IPTS_CMD_CLEAR_MEM_WINDOW = 0x07,
++	IPTS_CMD_RESET_SENSOR = 0x0B,
++	IPTS_CMD_GET_DESCRIPTOR = 0x0F,
++};
++
++/**
++ * enum ipts_status - Possible status codes returned by the IPTS device.
++ * @IPTS_STATUS_SUCCESS:                 Operation completed successfully.
++ * @IPTS_STATUS_INVALID_PARAMS:          Command contained an invalid payload.
++ * @IPTS_STATUS_ACCESS_DENIED:           ME could not validate a buffer address.
++ * @IPTS_STATUS_CMD_SIZE_ERROR:          Command contains an invalid payload.
++ * @IPTS_STATUS_NOT_READY:               Buffer addresses have not been set.
++ * @IPTS_STATUS_REQUEST_OUTSTANDING:     There is an outstanding command of the same type.
++ * @IPTS_STATUS_NO_SENSOR_FOUND:         No sensor could be found.
++ * @IPTS_STATUS_OUT_OF_MEMORY:           Not enough free memory for requested operation.
++ * @IPTS_STATUS_INTERNAL_ERROR:          An unexpected error occurred.
++ * @IPTS_STATUS_SENSOR_DISABLED:         The sensor has been disabled and must be reinitialized.
++ * @IPTS_STATUS_COMPAT_CHECK_FAIL:       Compatibility revision check between sensor and ME failed.
++ *                                       The host can ignore this error and attempt to continue.
++ * @IPTS_STATUS_SENSOR_EXPECTED_RESET:   The sensor went through a reset initiated by the driver.
++ * @IPTS_STATUS_SENSOR_UNEXPECTED_RESET: The sensor went through an unexpected reset.
++ * @IPTS_STATUS_RESET_FAILED:            Requested sensor reset failed to complete.
++ * @IPTS_STATUS_TIMEOUT:                 The operation timed out.
++ * @IPTS_STATUS_TEST_MODE_FAIL:          Test mode pattern did not match expected values.
++ * @IPTS_STATUS_SENSOR_FAIL_FATAL:       The sensor reported an error during reset sequence.
++ *                                       Further progress is not possible.
++ * @IPTS_STATUS_SENSOR_FAIL_NONFATAL:    The sensor reported an error during reset sequence.
++ *                                       The driver can attempt to continue.
++ * @IPTS_STATUS_INVALID_DEVICE_CAPS:     The device reported invalid capabilities.
++ * @IPTS_STATUS_QUIESCE_IO_IN_PROGRESS:  Command cannot be completed until Quiesce IO is done.
++ */
++enum ipts_status {
++	IPTS_STATUS_SUCCESS = 0x00,
++	IPTS_STATUS_INVALID_PARAMS = 0x01,
++	IPTS_STATUS_ACCESS_DENIED = 0x02,
++	IPTS_STATUS_CMD_SIZE_ERROR = 0x03,
++	IPTS_STATUS_NOT_READY = 0x04,
++	IPTS_STATUS_REQUEST_OUTSTANDING = 0x05,
++	IPTS_STATUS_NO_SENSOR_FOUND = 0x06,
++	IPTS_STATUS_OUT_OF_MEMORY = 0x07,
++	IPTS_STATUS_INTERNAL_ERROR = 0x08,
++	IPTS_STATUS_SENSOR_DISABLED = 0x09,
++	IPTS_STATUS_COMPAT_CHECK_FAIL = 0x0A,
++	IPTS_STATUS_SENSOR_EXPECTED_RESET = 0x0B,
++	IPTS_STATUS_SENSOR_UNEXPECTED_RESET = 0x0C,
++	IPTS_STATUS_RESET_FAILED = 0x0D,
++	IPTS_STATUS_TIMEOUT = 0x0E,
++	IPTS_STATUS_TEST_MODE_FAIL = 0x0F,
++	IPTS_STATUS_SENSOR_FAIL_FATAL = 0x10,
++	IPTS_STATUS_SENSOR_FAIL_NONFATAL = 0x11,
++	IPTS_STATUS_INVALID_DEVICE_CAPS = 0x12,
++	IPTS_STATUS_QUIESCE_IO_IN_PROGRESS = 0x13,
++};
++
++/**
++ * struct ipts_command - Message that is sent to the device for calling a command.
++ * @cmd:     The command that will be called.
++ * @payload: Payload containing parameters for the called command.
++ */
++struct ipts_command {
++	enum ipts_command_code cmd;
++	u8 payload[320];
++} __packed;
++
++static_assert(sizeof(struct ipts_command) == 324);
++
++/**
++ * enum ipts_mode - Configures what data the device produces and how its sent.
++ * @IPTS_MODE_EVENT:    The device will send an event once a buffer was filled.
++ *                      Older devices will return singletouch data in this mode.
++ * @IPTS_MODE_DOORBELL: The device will notify the driver by incrementing the doorbell value.
++ *                      Older devices will return multitouch data in this mode.
++ */
++enum ipts_mode {
++	IPTS_MODE_EVENT = 0x00,
++	IPTS_MODE_DOORBELL = 0x01,
++};
++
++/**
++ * struct ipts_set_mode - Payload for the SET_MODE command.
++ * @mode: Changes the mode that IPTS will operate in.
++ */
++struct ipts_set_mode {
++	enum ipts_mode mode;
++	u8 reserved[12];
++} __packed;
++
++static_assert(sizeof(struct ipts_set_mode) == 16);
++
++#define IPTS_WORKQUEUE_SIZE	 8192
++#define IPTS_WORKQUEUE_ITEM_SIZE 16
++
++/**
++ * struct ipts_mem_window - Payload for the SET_MEM_WINDOW command.
++ * @data_addr_lower:      Lower 32 bits of the data buffer addresses.
++ * @data_addr_upper:      Upper 32 bits of the data buffer addresses.
++ * @workqueue_addr_lower: Lower 32 bits of the workqueue buffer address.
++ * @workqueue_addr_upper: Upper 32 bits of the workqueue buffer address.
++ * @doorbell_addr_lower:  Lower 32 bits of the doorbell buffer address.
++ * @doorbell_addr_upper:  Upper 32 bits of the doorbell buffer address.
++ * @feedbackaddr_lower:   Lower 32 bits of the feedback buffer addresses.
++ * @feedbackaddr_upper:   Upper 32 bits of the feedback buffer addresses.
++ * @hid2me_addr_lower:    Lower 32 bits of the hid2me buffer address.
++ * @hid2me_addr_upper:    Upper 32 bits of the hid2me buffer address.
++ * @hid2me_size:          Size of the hid2me feedback buffer.
++ * @workqueue_item_size:  Magic value. Must be 16.
++ * @workqueue_size:       Magic value. Must be 8192.
++ *
++ * The workqueue related items in this struct are required for using
++ * GuC submission with binary processing firmware. Since this driver does
++ * not use GuC submission and instead exports raw data to userspace, these
++ * items are not actually used, but they need to be allocated and passed
++ * to the device, otherwise initialization will fail.
++ */
++struct ipts_mem_window {
++	u32 data_addr_lower[IPTS_BUFFERS];
++	u32 data_addr_upper[IPTS_BUFFERS];
++	u32 workqueue_addr_lower;
++	u32 workqueue_addr_upper;
++	u32 doorbell_addr_lower;
++	u32 doorbell_addr_upper;
++	u32 feedback_addr_lower[IPTS_BUFFERS];
++	u32 feedback_addr_upper[IPTS_BUFFERS];
++	u32 hid2me_addr_lower;
++	u32 hid2me_addr_upper;
++	u32 hid2me_size;
++	u8 reserved1;
++	u8 workqueue_item_size;
++	u16 workqueue_size;
++	u8 reserved[32];
++} __packed;
++
++static_assert(sizeof(struct ipts_mem_window) == 320);
++
++/**
++ * struct ipts_quiesce_io - Payload for the QUIESCE_IO command.
++ */
++struct ipts_quiesce_io {
++	u8 reserved[12];
++} __packed;
++
++static_assert(sizeof(struct ipts_quiesce_io) == 12);
++
++/**
++ * struct ipts_feedback - Payload for the FEEDBACK command.
++ * @buffer: The buffer that the device should refill.
++ */
++struct ipts_feedback {
++	u32 buffer;
++	u8 reserved[12];
++} __packed;
++
++static_assert(sizeof(struct ipts_feedback) == 16);
++
++/**
++ * enum ipts_reset_type - Possible ways of resetting the device.
++ * @IPTS_RESET_TYPE_HARD: Perform hardware reset using GPIO pin.
++ * @IPTS_RESET_TYPE_SOFT: Perform software reset using SPI command.
++ */
++enum ipts_reset_type {
++	IPTS_RESET_TYPE_HARD = 0x00,
++	IPTS_RESET_TYPE_SOFT = 0x01,
++};
++
++/**
++ * struct ipts_reset - Payload for the RESET_SENSOR command.
++ * @type: How the device should get reset.
++ */
++struct ipts_reset_sensor {
++	enum ipts_reset_type type;
++	u8 reserved[4];
++} __packed;
++
++static_assert(sizeof(struct ipts_reset_sensor) == 8);
++
++/**
++ * struct ipts_get_descriptor - Payload for the GET_DESCRIPTOR command.
++ * @addr_lower: The lower 32 bits of the descriptor buffer address.
++ * @addr_upper: The upper 32 bits of the descriptor buffer address.
++ * @magic:      A magic value. Must be 8.
++ */
++struct ipts_get_descriptor {
++	u32 addr_lower;
++	u32 addr_upper;
++	u32 magic;
++	u8 reserved[12];
++} __packed;
++
++static_assert(sizeof(struct ipts_get_descriptor) == 24);
++
++/*
++ * The type of a response is indicated by a
++ * command code, with the most significant bit flipped to 1.
++ */
++#define IPTS_RSP_BIT BIT(31)
++
++/**
++ * struct ipts_response - Data returned from the device in response to a command.
++ * @cmd:     The command that this response answers (IPTS_RSP_BIT will be 1).
++ * @status:  The return code of the command.
++ * @payload: The data that was produced by the command.
++ */
++struct ipts_response {
++	enum ipts_command_code cmd;
++	enum ipts_status status;
++	u8 payload[80];
++} __packed;
++
++static_assert(sizeof(struct ipts_response) == 88);
++
++/**
++ * struct ipts_device_info - Vendor information of the IPTS device.
++ * @vendor:        Vendor ID of this device.
++ * @product:       Product ID of this device.
++ * @hw_version:    Hardware revision of this device.
++ * @fw_version:    Firmware revision of this device.
++ * @data_size:     Requested size for a data buffer.
++ * @feedback_size: Requested size for a feedback buffer.
++ * @mode:          Mode that the device currently operates in.
++ * @max_contacts:  Maximum amount of concurrent touches the sensor can process.
++ */
++struct ipts_device_info {
++	u16 vendor;
++	u16 product;
++	u32 hw_version;
++	u32 fw_version;
++	u32 data_size;
++	u32 feedback_size;
++	enum ipts_mode mode;
++	u8 max_contacts;
++	u8 reserved1[3];
++	u8 sensor_min_eds;
++	u8 sensor_maj_eds;
++	u8 me_min_eds;
++	u8 me_maj_eds;
++	u8 intf_eds;
++	u8 reserved2[11];
++} __packed;
++
++static_assert(sizeof(struct ipts_device_info) == 44);
++
++#endif /* IPTS_SPEC_DEVICE_H */
+diff --git a/drivers/hid/ipts/spec-hid.h b/drivers/hid/ipts/spec-hid.h
+new file mode 100644
+index 000000000000..ea70f29ff00c
+--- /dev/null
++++ b/drivers/hid/ipts/spec-hid.h
+@@ -0,0 +1,35 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2020-2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_SPEC_HID_H
++#define IPTS_SPEC_HID_H
++
++#include <linux/build_bug.h>
++#include <linux/types.h>
++
++/*
++ * Made-up type for passing raw IPTS data in a HID report.
++ */
++#define IPTS_HID_FRAME_TYPE_RAW 0xEE
++
++/**
++ * struct ipts_hid_frame - Header that is prefixed to raw IPTS data wrapped in a HID report.
++ * @size: Size of the data inside the report, including this header.
++ * @type: What type of data does this report contain.
++ */
++struct ipts_hid_header {
++	u32 size;
++	u8 reserved1;
++	u8 type;
++	u8 reserved2;
++	u8 data[];
++} __packed;
++
++static_assert(sizeof(struct ipts_hid_header) == 7);
++
++#endif /* IPTS_SPEC_HID_H */
+diff --git a/drivers/hid/ipts/thread.c b/drivers/hid/ipts/thread.c
+new file mode 100644
+index 000000000000..8b46f775c107
+--- /dev/null
++++ b/drivers/hid/ipts/thread.c
+@@ -0,0 +1,85 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#include <linux/completion.h>
++#include <linux/err.h>
++#include <linux/kthread.h>
++#include <linux/mutex.h>
++
++#include "thread.h"
++
++bool ipts_thread_should_stop(struct ipts_thread *thread)
++{
++	if (!thread)
++		return false;
++
++	return READ_ONCE(thread->should_stop);
++}
++
++static int ipts_thread_runner(void *data)
++{
++	int ret = 0;
++	struct ipts_thread *thread = data;
++
++	if (!thread)
++		return -EFAULT;
++
++	if (!thread->threadfn)
++		return -EFAULT;
++
++	ret = thread->threadfn(thread);
++	complete_all(&thread->done);
++
++	return ret;
++}
++
++int ipts_thread_start(struct ipts_thread *thread, int (*threadfn)(struct ipts_thread *thread),
++		      void *data, const char *name)
++{
++	if (!thread)
++		return -EFAULT;
++
++	if (!threadfn)
++		return -EFAULT;
++
++	init_completion(&thread->done);
++
++	thread->data = data;
++	thread->should_stop = false;
++	thread->threadfn = threadfn;
++
++	thread->thread = kthread_run(ipts_thread_runner, thread, name);
++	return PTR_ERR_OR_ZERO(thread->thread);
++}
++
++int ipts_thread_stop(struct ipts_thread *thread)
++{
++	int ret = 0;
++
++	if (!thread)
++		return -EFAULT;
++
++	if (!thread->thread)
++		return 0;
++
++	WRITE_ONCE(thread->should_stop, true);
++
++	/*
++	 * Make sure that the write has gone through before waiting.
++	 */
++	wmb();
++
++	wait_for_completion(&thread->done);
++	ret = kthread_stop(thread->thread);
++
++	thread->thread = NULL;
++	thread->data = NULL;
++	thread->threadfn = NULL;
++
++	return ret;
++}
+diff --git a/drivers/hid/ipts/thread.h b/drivers/hid/ipts/thread.h
+new file mode 100644
+index 000000000000..a314843599fc
+--- /dev/null
++++ b/drivers/hid/ipts/thread.h
+@@ -0,0 +1,60 @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++/*
++ * Copyright (c) 2016 Intel Corporation
++ * Copyright (c) 2023 Dorian Stoll
++ *
++ * Linux driver for Intel Precise Touch & Stylus
++ */
++
++#ifndef IPTS_THREAD_H
++#define IPTS_THREAD_H
++
++#include <linux/completion.h>
++#include <linux/mutex.h>
++#include <linux/sched.h>
++
++/*
++ * This wrapper over kthread is necessary, because calling kthread_stop makes it impossible
++ * to issue MEI commands from that thread while it shuts itself down. By using a custom
++ * boolean variable and a completion object, we can call kthread_stop only when the thread
++ * already finished all of its work and has returned.
++ */
++struct ipts_thread {
++	struct task_struct *thread;
++
++	bool should_stop;
++	struct completion done;
++
++	void *data;
++	int (*threadfn)(struct ipts_thread *thread);
++};
++
++/*
++ * ipts_thread_should_stop() - Returns true if the thread is asked to terminate.
++ * @thread: The current thread.
++ *
++ * Returns: true if the thread should stop, false if not.
++ */
++bool ipts_thread_should_stop(struct ipts_thread *thread);
++
++/*
++ * ipts_thread_start() - Starts an IPTS thread.
++ * @thread: The thread to initialize and start.
++ * @threadfn: The function to execute.
++ * @data: An argument that will be passed to threadfn.
++ * @name: The name of the new thread.
++ *
++ * Returns: 0 on success, <0 on error.
++ */
++int ipts_thread_start(struct ipts_thread *thread, int (*threadfn)(struct ipts_thread *thread),
++		      void *data, const char name[]);
++
++/*
++ * ipts_thread_stop() - Asks the thread to terminate and waits until it has finished.
++ * @thread: The thread that should stop.
++ *
++ * Returns: The return value of the thread function.
++ */
++int ipts_thread_stop(struct ipts_thread *thread);
++
++#endif /* IPTS_THREAD_H */
+-- 
+2.41.0
+
+From ebc87e019cb5901338b8db8ec6f191deb9995619 Mon Sep 17 00:00:00 2001
+From: Dorian Stoll <dorian.stoll@tmsp.io>
+Date: Fri, 28 Apr 2023 15:41:12 +0200
+Subject: [PATCH] Update IPTS from module repo
+
+Changes:
+ * Fix redefinition error on AOSP clang
+ * Increase the polling frequency to reduce latency
+ * Don't allocate a new buffer for every HID report
+ * Always use the generic HID driver instead of forcing hid-multitouch
+
+Based on https://github.com/linux-surface/intel-precise-touch/commit/a2b675d72dbde80ebe36a5b6ceaebd596c030314
+
+Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>
+Patchset: ipts
+---
+ drivers/hid/ipts/hid.c       | 15 +++++----------
+ drivers/hid/ipts/receiver.c  |  2 +-
+ drivers/hid/ipts/resources.c | 35 +++++++++++++++++++++++++++++++----
+ drivers/hid/ipts/resources.h |  3 +++
+ 4 files changed, 40 insertions(+), 15 deletions(-)
+
+diff --git a/drivers/hid/ipts/hid.c b/drivers/hid/ipts/hid.c
+index 6782394e8dde..a2471219615b 100644
+--- a/drivers/hid/ipts/hid.c
++++ b/drivers/hid/ipts/hid.c
+@@ -237,7 +237,6 @@ static struct hid_ll_driver ipts_hid_driver = {
+ 
+ int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer)
+ {
+-	int ret = 0;
+ 	u8 *temp = NULL;
+ 	struct ipts_hid_header *frame = NULL;
+ 	struct ipts_data_header *header = NULL;
+@@ -250,6 +249,9 @@ int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer)
+ 
+ 	header = (struct ipts_data_header *)ipts->resources.data[buffer].address;
+ 
++	temp = ipts->resources.report.address;
++	memset(temp, 0, ipts->resources.report.size);
++
+ 	if (!header)
+ 		return -EFAULT;
+ 
+@@ -273,10 +275,6 @@ int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer)
+ 	if (header->size + 3 + sizeof(struct ipts_hid_header) > IPTS_HID_REPORT_DATA_SIZE)
+ 		return -ERANGE;
+ 
+-	temp = kzalloc(IPTS_HID_REPORT_DATA_SIZE, GFP_KERNEL);
+-	if (!temp)
+-		return -ENOMEM;
+-
+ 	/*
+ 	 * Synthesize a HID report matching the devices that natively send HID reports
+ 	 */
+@@ -288,10 +286,7 @@ int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer)
+ 
+ 	memcpy(frame->data, header->data, header->size);
+ 
+-	ret = hid_input_report(ipts->hid, HID_INPUT_REPORT, temp, IPTS_HID_REPORT_DATA_SIZE, 1);
+-	kfree(temp);
+-
+-	return ret;
++	return hid_input_report(ipts->hid, HID_INPUT_REPORT, temp, IPTS_HID_REPORT_DATA_SIZE, 1);
+ }
+ 
+ int ipts_hid_init(struct ipts_context *ipts, struct ipts_device_info info)
+@@ -318,7 +313,7 @@ int ipts_hid_init(struct ipts_context *ipts, struct ipts_device_info info)
+ 
+ 	ipts->hid->vendor = info.vendor;
+ 	ipts->hid->product = info.product;
+-	ipts->hid->group = HID_GROUP_MULTITOUCH;
++	ipts->hid->group = HID_GROUP_GENERIC;
+ 
+ 	snprintf(ipts->hid->name, sizeof(ipts->hid->name), "IPTS %04X:%04X", info.vendor,
+ 		 info.product);
+diff --git a/drivers/hid/ipts/receiver.c b/drivers/hid/ipts/receiver.c
+index 77234f9e0e17..f56e9ed32d57 100644
+--- a/drivers/hid/ipts/receiver.c
++++ b/drivers/hid/ipts/receiver.c
+@@ -42,7 +42,7 @@ static void ipts_receiver_backoff(time64_t last, u32 n)
+ 	 * n seconds, sleep longer to avoid wasting CPU cycles.
+ 	 */
+ 	if (last + n > ktime_get_seconds())
+-		msleep(20);
++		usleep_range(1 * USEC_PER_MSEC, 5 * USEC_PER_MSEC);
+ 	else
+ 		msleep(200);
+ }
+diff --git a/drivers/hid/ipts/resources.c b/drivers/hid/ipts/resources.c
+index 80ba5885bb55..5e924d58c488 100644
+--- a/drivers/hid/ipts/resources.c
++++ b/drivers/hid/ipts/resources.c
+@@ -9,6 +9,7 @@
+ #include <linux/dma-mapping.h>
+ #include <linux/types.h>
+ 
++#include "desc.h"
+ #include "resources.h"
+ #include "spec-device.h"
+ 
+@@ -49,16 +50,22 @@ int ipts_resources_init(struct ipts_resources *res, struct device *dev, size_t d
+ {
+ 	int ret = 0;
+ 
++	/*
++	 * Some compilers (AOSP clang) complain about a redefined
++	 * variable when this is declared inside of the for loop.
++	 */
++	int i = 0;
++
+ 	if (!res)
+ 		return -EFAULT;
+ 
+-	for (int i = 0; i < IPTS_BUFFERS; i++) {
++	for (i = 0; i < IPTS_BUFFERS; i++) {
+ 		ret = ipts_resources_alloc_buffer(&res->data[i], dev, ds);
+ 		if (ret)
+ 			goto err;
+ 	}
+ 
+-	for (int i = 0; i < IPTS_BUFFERS; i++) {
++	for (i = 0; i < IPTS_BUFFERS; i++) {
+ 		ret = ipts_resources_alloc_buffer(&res->feedback[i], dev, fs);
+ 		if (ret)
+ 			goto err;
+@@ -80,6 +87,16 @@ int ipts_resources_init(struct ipts_resources *res, struct device *dev, size_t d
+ 	if (ret)
+ 		goto err;
+ 
++	if (!res->report.address) {
++		res->report.size = IPTS_HID_REPORT_DATA_SIZE;
++		res->report.address = kzalloc(res->report.size, GFP_KERNEL);
++
++		if (!res->report.address) {
++			ret = -ENOMEM;
++			goto err;
++		}
++	}
++
+ 	return 0;
+ 
+ err:
+@@ -90,13 +107,19 @@ int ipts_resources_init(struct ipts_resources *res, struct device *dev, size_t d
+ 
+ int ipts_resources_free(struct ipts_resources *res)
+ {
++	/*
++	 * Some compilers (AOSP clang) complain about a redefined
++	 * variable when this is declared inside of the for loop.
++	 */
++	int i = 0;
++
+ 	if (!res)
+ 		return -EFAULT;
+ 
+-	for (int i = 0; i < IPTS_BUFFERS; i++)
++	for (i = 0; i < IPTS_BUFFERS; i++)
+ 		ipts_resources_free_buffer(&res->data[i]);
+ 
+-	for (int i = 0; i < IPTS_BUFFERS; i++)
++	for (i = 0; i < IPTS_BUFFERS; i++)
+ 		ipts_resources_free_buffer(&res->feedback[i]);
+ 
+ 	ipts_resources_free_buffer(&res->doorbell);
+@@ -104,5 +127,9 @@ int ipts_resources_free(struct ipts_resources *res)
+ 	ipts_resources_free_buffer(&res->hid2me);
+ 	ipts_resources_free_buffer(&res->descriptor);
+ 
++	kfree(res->report.address);
++	res->report.address = NULL;
++	res->report.size = 0;
++
+ 	return 0;
+ }
+diff --git a/drivers/hid/ipts/resources.h b/drivers/hid/ipts/resources.h
+index 6cbb24a8a054..e0c400f420b9 100644
+--- a/drivers/hid/ipts/resources.h
++++ b/drivers/hid/ipts/resources.h
+@@ -31,6 +31,9 @@ struct ipts_resources {
+ 	struct ipts_buffer hid2me;
+ 
+ 	struct ipts_buffer descriptor;
++
++	// Buffer for synthesizing HID reports
++	struct ipts_buffer report;
+ };
+ 
+ int ipts_resources_init(struct ipts_resources *res, struct device *dev, size_t ds, size_t fs);
+-- 
+2.41.0
+

patches/6.4/0005-ithc.patch

@@ -0,0 +1,1433 @@
+From 22887bcb046c16268673c0386fdd9986b0178eee Mon Sep 17 00:00:00 2001
+From: Dorian Stoll <dorian.stoll@tmsp.io>
+Date: Sun, 11 Dec 2022 12:03:38 +0100
+Subject: [PATCH] iommu: intel: Disable source id verification for ITHC
+
+Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>
+Patchset: ithc
+---
+ drivers/iommu/intel/irq_remapping.c | 16 ++++++++++++++++
+ 1 file changed, 16 insertions(+)
+
+diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
+index a1b987335b31..970805409470 100644
+--- a/drivers/iommu/intel/irq_remapping.c
++++ b/drivers/iommu/intel/irq_remapping.c
+@@ -390,6 +390,22 @@ static int set_msi_sid(struct irte *irte, struct pci_dev *dev)
+ 	data.busmatch_count = 0;
+ 	pci_for_each_dma_alias(dev, set_msi_sid_cb, &data);
+ 
++	/*
++	 * The Intel Touch Host Controller is at 00:10.6, but for some reason
++	 * the MSI interrupts have request id 01:05.0.
++	 * Disable id verification to work around this.
++	 * FIXME Find proper fix or turn this into a quirk.
++	 */
++	if (dev->vendor == PCI_VENDOR_ID_INTEL && (dev->class >> 8) == PCI_CLASS_INPUT_PEN) {
++		switch(dev->device) {
++		case 0x98d0: case 0x98d1: // LKF
++		case 0xa0d0: case 0xa0d1: // TGL LP
++		case 0x43d0: case 0x43d1: // TGL H
++			set_irte_sid(irte, SVT_NO_VERIFY, SQ_ALL_16, 0);
++			return 0;
++		}
++	}
++
+ 	/*
+ 	 * DMA alias provides us with a PCI device and alias.  The only case
+ 	 * where the it will return an alias on a different bus than the
+-- 
+2.41.0
+
+From ce2c4a772d587cec136e43e18fab8685700e535b Mon Sep 17 00:00:00 2001
+From: Dorian Stoll <dorian.stoll@tmsp.io>
+Date: Sun, 11 Dec 2022 12:10:54 +0100
+Subject: [PATCH] hid: Add support for Intel Touch Host Controller
+
+Based on quo/ithc-linux@55803a2
+
+Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>
+Patchset: ithc
+---
+ drivers/hid/Kconfig           |   2 +
+ drivers/hid/Makefile          |   1 +
+ drivers/hid/ithc/Kbuild       |   6 +
+ drivers/hid/ithc/Kconfig      |  12 +
+ drivers/hid/ithc/ithc-debug.c |  96 ++++++
+ drivers/hid/ithc/ithc-dma.c   | 258 ++++++++++++++++
+ drivers/hid/ithc/ithc-dma.h   |  67 +++++
+ drivers/hid/ithc/ithc-main.c  | 534 ++++++++++++++++++++++++++++++++++
+ drivers/hid/ithc/ithc-regs.c  |  64 ++++
+ drivers/hid/ithc/ithc-regs.h  | 186 ++++++++++++
+ drivers/hid/ithc/ithc.h       |  60 ++++
+ 11 files changed, 1286 insertions(+)
+ create mode 100644 drivers/hid/ithc/Kbuild
+ create mode 100644 drivers/hid/ithc/Kconfig
+ create mode 100644 drivers/hid/ithc/ithc-debug.c
+ create mode 100644 drivers/hid/ithc/ithc-dma.c
+ create mode 100644 drivers/hid/ithc/ithc-dma.h
+ create mode 100644 drivers/hid/ithc/ithc-main.c
+ create mode 100644 drivers/hid/ithc/ithc-regs.c
+ create mode 100644 drivers/hid/ithc/ithc-regs.h
+ create mode 100644 drivers/hid/ithc/ithc.h
+
+diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
+index 7945cb57f531..91e9e4f58c27 100644
+--- a/drivers/hid/Kconfig
++++ b/drivers/hid/Kconfig
+@@ -1318,4 +1318,6 @@ source "drivers/hid/surface-hid/Kconfig"
+ 
+ source "drivers/hid/ipts/Kconfig"
+ 
++source "drivers/hid/ithc/Kconfig"
++
+ endif # HID_SUPPORT
+diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
+index 285e12d95b0e..a3ff62e922f1 100644
+--- a/drivers/hid/Makefile
++++ b/drivers/hid/Makefile
+@@ -169,3 +169,4 @@ obj-$(CONFIG_AMD_SFH_HID)       += amd-sfh-hid/
+ obj-$(CONFIG_SURFACE_HID_CORE)  += surface-hid/
+ 
+ obj-$(CONFIG_HID_IPTS)          += ipts/
++obj-$(CONFIG_HID_ITHC)          += ithc/
+diff --git a/drivers/hid/ithc/Kbuild b/drivers/hid/ithc/Kbuild
+new file mode 100644
+index 000000000000..aea83f2ac07b
+--- /dev/null
++++ b/drivers/hid/ithc/Kbuild
+@@ -0,0 +1,6 @@
++obj-$(CONFIG_HID_ITHC) := ithc.o
++
++ithc-objs := ithc-main.o ithc-regs.o ithc-dma.o ithc-debug.o
++
++ccflags-y := -std=gnu11 -Wno-declaration-after-statement
++
+diff --git a/drivers/hid/ithc/Kconfig b/drivers/hid/ithc/Kconfig
+new file mode 100644
+index 000000000000..ede713023609
+--- /dev/null
++++ b/drivers/hid/ithc/Kconfig
+@@ -0,0 +1,12 @@
++config HID_ITHC
++	tristate "Intel Touch Host Controller"
++	depends on PCI
++	depends on HID
++	help
++	  Say Y here if your system has a touchscreen using Intels
++	  Touch Host Controller (ITHC / IPTS) technology.
++
++	  If unsure say N.
++
++	  To compile this driver as a module, choose M here: the
++	  module will be called ithc.
+diff --git a/drivers/hid/ithc/ithc-debug.c b/drivers/hid/ithc/ithc-debug.c
+new file mode 100644
+index 000000000000..57bf125c45bd
+--- /dev/null
++++ b/drivers/hid/ithc/ithc-debug.c
+@@ -0,0 +1,96 @@
++#include "ithc.h"
++
++void ithc_log_regs(struct ithc *ithc) {
++	if (!ithc->prev_regs) return;
++	u32 __iomem *cur = (__iomem void*)ithc->regs;
++	u32 *prev = (void*)ithc->prev_regs;
++	for (int i = 1024; i < sizeof *ithc->regs / 4; i++) {
++		u32 x = readl(cur + i);
++		if (x != prev[i]) {
++			pci_info(ithc->pci, "reg %04x: %08x -> %08x\n", i * 4, prev[i], x);
++			prev[i] = x;
++		}
++	}
++}
++
++static ssize_t ithc_debugfs_cmd_write(struct file *f, const char __user *buf, size_t len, loff_t *offset) {
++	struct ithc *ithc = file_inode(f)->i_private;
++	char cmd[256];
++	if (!ithc || !ithc->pci) return -ENODEV;
++	if (!len) return -EINVAL;
++	if (len >= sizeof cmd) return -EINVAL;
++	if (copy_from_user(cmd, buf, len)) return -EFAULT;
++	cmd[len] = 0;
++	if (cmd[len-1] == '\n') cmd[len-1] = 0;
++	pci_info(ithc->pci, "debug command: %s\n", cmd);
++	u32 n = 0;
++	const char *s = cmd + 1;
++	u32 a[32];
++	while (*s && *s != '\n') {
++		if (n >= ARRAY_SIZE(a)) return -EINVAL;
++		if (*s++ != ' ') return -EINVAL;
++		char *e;
++		a[n++] = simple_strtoul(s, &e, 0);
++		if (e == s) return -EINVAL;
++		s = e;
++	}
++	ithc_log_regs(ithc);
++	switch(cmd[0]) {
++	case 'x': // reset
++		ithc_reset(ithc);
++		break;
++	case 'w': // write register: offset mask value
++		if (n != 3 || (a[0] & 3)) return -EINVAL;
++		pci_info(ithc->pci, "debug write 0x%04x = 0x%08x (mask 0x%08x)\n", a[0], a[2], a[1]);
++		bitsl(((__iomem u32 *)ithc->regs) + a[0] / 4, a[1], a[2]);
++		break;
++	case 'r': // read register: offset
++		if (n != 1 || (a[0] & 3)) return -EINVAL;
++		pci_info(ithc->pci, "debug read 0x%04x = 0x%08x\n", a[0], readl(((__iomem u32 *)ithc->regs) + a[0] / 4));
++		break;
++	case 's': // spi command: cmd offset len data...
++		// read config: s 4 0 64 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
++		// set touch cfg: s 6 12 4 XX
++		if (n < 3 || a[2] > (n - 3) * 4) return -EINVAL;
++		pci_info(ithc->pci, "debug spi command %u with %u bytes of data\n", a[0], a[2]);
++		if (!CHECK(ithc_spi_command, ithc, a[0], a[1], a[2], a + 3))
++			for (u32 i = 0; i < (a[2] + 3) / 4; i++) pci_info(ithc->pci, "resp %u = 0x%08x\n", i, a[3+i]);
++		break;
++	case 'd': // dma command: cmd len data...
++		// get report descriptor: d 7 8 0 0
++		// enable multitouch: d 3 2 0x0105
++		if (n < 2 || a[1] > (n - 2) * 4) return -EINVAL;
++		pci_info(ithc->pci, "debug dma command %u with %u bytes of data\n", a[0], a[1]);
++		if (ithc_dma_tx(ithc, a[0], a[1], a + 2)) pci_err(ithc->pci, "dma tx failed\n");
++		break;
++	default:
++		return -EINVAL;
++	}
++	ithc_log_regs(ithc);
++	return len;
++}
++
++static const struct file_operations ithc_debugfops_cmd = {
++	.owner = THIS_MODULE,
++	.write = ithc_debugfs_cmd_write,
++};
++
++static void ithc_debugfs_devres_release(struct device *dev, void *res) {
++	struct dentry **dbgm = res;
++	if (*dbgm) debugfs_remove_recursive(*dbgm);
++}
++
++int ithc_debug_init(struct ithc *ithc) {
++	struct dentry **dbgm = devres_alloc(ithc_debugfs_devres_release, sizeof *dbgm, GFP_KERNEL);
++	if (!dbgm) return -ENOMEM;
++	devres_add(&ithc->pci->dev, dbgm);
++	struct dentry *dbg = debugfs_create_dir(DEVNAME, NULL);
++	if (IS_ERR(dbg)) return PTR_ERR(dbg);
++	*dbgm = dbg;
++
++	struct dentry *cmd = debugfs_create_file("cmd", 0220, dbg, ithc, &ithc_debugfops_cmd);
++	if (IS_ERR(cmd)) return PTR_ERR(cmd);
++
++	return 0;
++}
++
+diff --git a/drivers/hid/ithc/ithc-dma.c b/drivers/hid/ithc/ithc-dma.c
+new file mode 100644
+index 000000000000..7e89b3496918
+--- /dev/null
++++ b/drivers/hid/ithc/ithc-dma.c
+@@ -0,0 +1,258 @@
++#include "ithc.h"
++
++static int ithc_dma_prd_alloc(struct ithc *ithc, struct ithc_dma_prd_buffer *p, unsigned num_buffers, unsigned num_pages, enum dma_data_direction dir) {
++	p->num_pages = num_pages;
++	p->dir = dir;
++	p->size = round_up(num_buffers * num_pages * sizeof(struct ithc_phys_region_desc), PAGE_SIZE);
++	p->addr = dmam_alloc_coherent(&ithc->pci->dev, p->size, &p->dma_addr, GFP_KERNEL);
++	if (!p->addr) return -ENOMEM;
++	if (p->dma_addr & (PAGE_SIZE - 1)) return -EFAULT;
++	return 0;
++}
++
++struct ithc_sg_table {
++	void *addr;
++	struct sg_table sgt;
++	enum dma_data_direction dir;
++};
++static void ithc_dma_sgtable_free(struct sg_table *sgt) {
++	struct scatterlist *sg;
++	int i;
++	for_each_sgtable_sg(sgt, sg, i) {
++		struct page *p = sg_page(sg);
++		if (p) __free_page(p);
++	}
++	sg_free_table(sgt);
++}
++static void ithc_dma_data_devres_release(struct device *dev, void *res) {
++	struct ithc_sg_table *sgt = res;
++	if (sgt->addr) vunmap(sgt->addr);
++	dma_unmap_sgtable(dev, &sgt->sgt, sgt->dir, 0);
++	ithc_dma_sgtable_free(&sgt->sgt);
++}
++
++static int ithc_dma_data_alloc(struct ithc* ithc, struct ithc_dma_prd_buffer *prds, struct ithc_dma_data_buffer *b) {
++	// We don't use dma_alloc_coherent for data buffers, because they don't have to be contiguous (we can use one PRD per page) or coherent (they are unidirectional).
++	// Instead we use an sg_table of individually allocated pages (5.13 has dma_alloc_noncontiguous for this, but we'd like to support 5.10 for now).
++	struct page *pages[16];
++	if (prds->num_pages == 0 || prds->num_pages > ARRAY_SIZE(pages)) return -EINVAL;
++	b->active_idx = -1;
++	struct ithc_sg_table *sgt = devres_alloc(ithc_dma_data_devres_release, sizeof *sgt, GFP_KERNEL);
++	if (!sgt) return -ENOMEM;
++	sgt->dir = prds->dir;
++	if (!sg_alloc_table(&sgt->sgt, prds->num_pages, GFP_KERNEL)) {
++		struct scatterlist *sg;
++		int i;
++		bool ok = true;
++		for_each_sgtable_sg(&sgt->sgt, sg, i) {
++			struct page *p = pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO); // don't need __GFP_DMA for PCI DMA
++			if (!p) { ok = false; break; }
++			sg_set_page(sg, p, PAGE_SIZE, 0);
++		}
++		if (ok && !dma_map_sgtable(&ithc->pci->dev, &sgt->sgt, prds->dir, 0)) {
++			devres_add(&ithc->pci->dev, sgt);
++			b->sgt = &sgt->sgt;
++			b->addr = sgt->addr = vmap(pages, prds->num_pages, 0, PAGE_KERNEL);
++			if (!b->addr) return -ENOMEM;
++			return 0;
++		}
++		ithc_dma_sgtable_free(&sgt->sgt);
++	}
++	devres_free(sgt);
++	return -ENOMEM;
++}
++
++static int ithc_dma_data_buffer_put(struct ithc *ithc, struct ithc_dma_prd_buffer *prds, struct ithc_dma_data_buffer *b, unsigned idx) {
++	struct ithc_phys_region_desc *prd = prds->addr;
++	prd += idx * prds->num_pages;
++	if (b->active_idx >= 0) { pci_err(ithc->pci, "buffer already active\n"); return -EINVAL; }
++	b->active_idx = idx;
++	if (prds->dir == DMA_TO_DEVICE) {
++		if (b->data_size > PAGE_SIZE) return -EINVAL;
++		prd->addr = sg_dma_address(b->sgt->sgl) >> 10;
++		prd->size = b->data_size | PRD_FLAG_END;
++		flush_kernel_vmap_range(b->addr, b->data_size);
++	} else if (prds->dir == DMA_FROM_DEVICE) {
++		struct scatterlist *sg;
++		int i;
++		for_each_sgtable_dma_sg(b->sgt, sg, i) {
++			prd->addr = sg_dma_address(sg) >> 10;
++			prd->size = sg_dma_len(sg);
++			prd++;
++		}
++		prd[-1].size |= PRD_FLAG_END;
++	}
++	dma_wmb(); // for the prds
++	dma_sync_sgtable_for_device(&ithc->pci->dev, b->sgt, prds->dir);
++	return 0;
++}
++
++static int ithc_dma_data_buffer_get(struct ithc *ithc, struct ithc_dma_prd_buffer *prds, struct ithc_dma_data_buffer *b, unsigned idx) {
++	struct ithc_phys_region_desc *prd = prds->addr;
++	prd += idx * prds->num_pages;
++	if (b->active_idx != idx) { pci_err(ithc->pci, "wrong buffer index\n"); return -EINVAL; }
++	b->active_idx = -1;
++	if (prds->dir == DMA_FROM_DEVICE) {
++		dma_rmb(); // for the prds
++		b->data_size = 0;
++		struct scatterlist *sg;
++		int i;
++		for_each_sgtable_dma_sg(b->sgt, sg, i) {
++			unsigned size = prd->size;
++			b->data_size += size & PRD_SIZE_MASK;
++			if (size & PRD_FLAG_END) break;
++			if ((size & PRD_SIZE_MASK) != sg_dma_len(sg)) { pci_err(ithc->pci, "truncated prd\n"); break; }
++			prd++;
++		}
++		invalidate_kernel_vmap_range(b->addr, b->data_size);
++	}
++	dma_sync_sgtable_for_cpu(&ithc->pci->dev, b->sgt, prds->dir);
++	return 0;
++}
++
++int ithc_dma_rx_init(struct ithc *ithc, u8 channel, const char *devname) {
++	struct ithc_dma_rx *rx = &ithc->dma_rx[channel];
++	mutex_init(&rx->mutex);
++	u32 buf_size = DEVCFG_DMA_RX_SIZE(ithc->config.dma_buf_sizes);
++	unsigned num_pages = (buf_size + PAGE_SIZE - 1) / PAGE_SIZE;
++	pci_dbg(ithc->pci, "allocating rx buffers: num = %u, size = %u, pages = %u\n", NUM_RX_BUF, buf_size, num_pages);
++	CHECK_RET(ithc_dma_prd_alloc, ithc, &rx->prds, NUM_RX_BUF, num_pages, DMA_FROM_DEVICE);
++	for (unsigned i = 0; i < NUM_RX_BUF; i++)
++		CHECK_RET(ithc_dma_data_alloc, ithc, &rx->prds, &rx->bufs[i]);
++	writeb(DMA_RX_CONTROL2_RESET, &ithc->regs->dma_rx[channel].control2);
++	lo_hi_writeq(rx->prds.dma_addr, &ithc->regs->dma_rx[channel].addr);
++	writeb(NUM_RX_BUF - 1, &ithc->regs->dma_rx[channel].num_bufs);
++	writeb(num_pages - 1, &ithc->regs->dma_rx[channel].num_prds);
++	u8 head = readb(&ithc->regs->dma_rx[channel].head);
++	if (head) { pci_err(ithc->pci, "head is nonzero (%u)\n", head); return -EIO; }
++	for (unsigned i = 0; i < NUM_RX_BUF; i++)
++		CHECK_RET(ithc_dma_data_buffer_put, ithc, &rx->prds, &rx->bufs[i], i);
++	writeb(head ^ DMA_RX_WRAP_FLAG, &ithc->regs->dma_rx[channel].tail);
++	return 0;
++}
++void ithc_dma_rx_enable(struct ithc *ithc, u8 channel) {
++	bitsb_set(&ithc->regs->dma_rx[channel].control, DMA_RX_CONTROL_ENABLE | DMA_RX_CONTROL_IRQ_ERROR | DMA_RX_CONTROL_IRQ_DATA);
++	CHECK(waitl, ithc, &ithc->regs->dma_rx[1].status, DMA_RX_STATUS_ENABLED, DMA_RX_STATUS_ENABLED);
++}
++
++int ithc_dma_tx_init(struct ithc *ithc) {
++	struct ithc_dma_tx *tx = &ithc->dma_tx;
++	mutex_init(&tx->mutex);
++	tx->max_size = DEVCFG_DMA_TX_SIZE(ithc->config.dma_buf_sizes);
++	unsigned num_pages = (tx->max_size + PAGE_SIZE - 1) / PAGE_SIZE;
++	pci_dbg(ithc->pci, "allocating tx buffers: size = %u, pages = %u\n", tx->max_size, num_pages);
++	CHECK_RET(ithc_dma_prd_alloc, ithc, &tx->prds, 1, num_pages, DMA_TO_DEVICE);
++	CHECK_RET(ithc_dma_data_alloc, ithc, &tx->prds, &tx->buf);
++	lo_hi_writeq(tx->prds.dma_addr, &ithc->regs->dma_tx.addr);
++	writeb(num_pages - 1, &ithc->regs->dma_tx.num_prds);
++	CHECK_RET(ithc_dma_data_buffer_put, ithc, &ithc->dma_tx.prds, &ithc->dma_tx.buf, 0);
++	return 0;
++}
++
++static int ithc_dma_rx_process_buf(struct ithc *ithc, struct ithc_dma_data_buffer *data, u8 channel, u8 buf) {
++	if (buf >= NUM_RX_BUF) {
++		pci_err(ithc->pci, "invalid dma ringbuffer index\n");
++		return -EINVAL;
++	}
++	ithc_set_active(ithc);
++	u32 len = data->data_size;
++	struct ithc_dma_rx_header *hdr = data->addr;
++	u8 *hiddata = (void *)(hdr + 1);
++	if (len >= sizeof *hdr && hdr->code == DMA_RX_CODE_RESET) {
++		CHECK(ithc_reset, ithc);
++	} else if (len < sizeof *hdr || len != sizeof *hdr + hdr->data_size) {
++		if (hdr->code == DMA_RX_CODE_INPUT_REPORT) {
++			// When the CPU enters a low power state during DMA, we can get truncated messages.
++			// Typically this will be a single touch HID report that is only 1 byte, or a multitouch report that is 257 bytes.
++			// See also ithc_set_active().
++		} else {
++			pci_err(ithc->pci, "invalid dma rx data! channel %u, buffer %u, size %u, code %u, data size %u\n", channel, buf, len, hdr->code, hdr->data_size);
++			print_hex_dump_debug(DEVNAME " data: ", DUMP_PREFIX_OFFSET, 32, 1, hdr, min(len, 0x400u), 0);
++		}
++	} else if (hdr->code == DMA_RX_CODE_REPORT_DESCRIPTOR && hdr->data_size > 8) {
++		CHECK(hid_parse_report, ithc->hid, hiddata + 8, hdr->data_size - 8);
++		WRITE_ONCE(ithc->hid_parse_done, true);
++		wake_up(&ithc->wait_hid_parse);
++	} else if (hdr->code == DMA_RX_CODE_INPUT_REPORT) {
++		CHECK(hid_input_report, ithc->hid, HID_INPUT_REPORT, hiddata, hdr->data_size, 1);
++	} else if (hdr->code == DMA_RX_CODE_FEATURE_REPORT) {
++		bool done = false;
++		mutex_lock(&ithc->hid_get_feature_mutex);
++		if (ithc->hid_get_feature_buf) {
++			if (hdr->data_size < ithc->hid_get_feature_size) ithc->hid_get_feature_size = hdr->data_size;
++			memcpy(ithc->hid_get_feature_buf, hiddata, ithc->hid_get_feature_size);
++			ithc->hid_get_feature_buf = NULL;
++			done = true;
++		}
++		mutex_unlock(&ithc->hid_get_feature_mutex);
++		if (done) wake_up(&ithc->wait_hid_get_feature);
++		else CHECK(hid_input_report, ithc->hid, HID_FEATURE_REPORT, hiddata, hdr->data_size, 1);
++	} else {
++		pci_dbg(ithc->pci, "unhandled dma rx data! channel %u, buffer %u, size %u, code %u\n", channel, buf, len, hdr->code);
++		print_hex_dump_debug(DEVNAME " data: ", DUMP_PREFIX_OFFSET, 32, 1, hdr, min(len, 0x400u), 0);
++	}
++	return 0;
++}
++
++static int ithc_dma_rx_unlocked(struct ithc *ithc, u8 channel) {
++	struct ithc_dma_rx *rx = &ithc->dma_rx[channel];
++	unsigned n = rx->num_received;
++	u8 head_wrap = readb(&ithc->regs->dma_rx[channel].head);
++	while (1) {
++		u8 tail = n % NUM_RX_BUF;
++		u8 tail_wrap = tail | ((n / NUM_RX_BUF) & 1 ? 0 : DMA_RX_WRAP_FLAG);
++		writeb(tail_wrap, &ithc->regs->dma_rx[channel].tail);
++		// ringbuffer is full if tail_wrap == head_wrap
++		// ringbuffer is empty if tail_wrap == head_wrap ^ WRAP_FLAG
++		if (tail_wrap == (head_wrap ^ DMA_RX_WRAP_FLAG)) return 0;
++
++		// take the buffer that the device just filled
++		struct ithc_dma_data_buffer *b = &rx->bufs[n % NUM_RX_BUF];
++		CHECK_RET(ithc_dma_data_buffer_get, ithc, &rx->prds, b, tail);
++		rx->num_received = ++n;
++
++		// process data
++		CHECK(ithc_dma_rx_process_buf, ithc, b, channel, tail);
++
++		// give the buffer back to the device
++		CHECK_RET(ithc_dma_data_buffer_put, ithc, &rx->prds, b, tail);
++	}
++}
++int ithc_dma_rx(struct ithc *ithc, u8 channel) {
++	struct ithc_dma_rx *rx = &ithc->dma_rx[channel];
++	mutex_lock(&rx->mutex);
++	int ret = ithc_dma_rx_unlocked(ithc, channel);
++	mutex_unlock(&rx->mutex);
++	return ret;
++}
++
++static int ithc_dma_tx_unlocked(struct ithc *ithc, u32 cmdcode, u32 datasize, void *data) {
++	pci_dbg(ithc->pci, "dma tx command %u, size %u\n", cmdcode, datasize);
++	struct ithc_dma_tx_header *hdr;
++	u8 padding = datasize & 3 ? 4 - (datasize & 3) : 0;
++	unsigned fullsize = sizeof *hdr + datasize + padding;
++	if (fullsize > ithc->dma_tx.max_size || fullsize > PAGE_SIZE) return -EINVAL;
++	CHECK_RET(ithc_dma_data_buffer_get, ithc, &ithc->dma_tx.prds, &ithc->dma_tx.buf, 0);
++
++	ithc->dma_tx.buf.data_size = fullsize;
++	hdr = ithc->dma_tx.buf.addr;
++	hdr->code = cmdcode;
++	hdr->data_size = datasize;
++	u8 *dest = (void *)(hdr + 1);
++	memcpy(dest, data, datasize);
++	dest += datasize;
++	for (u8 p = 0; p < padding; p++) *dest++ = 0;
++	CHECK_RET(ithc_dma_data_buffer_put, ithc, &ithc->dma_tx.prds, &ithc->dma_tx.buf, 0);
++
++	bitsb_set(&ithc->regs->dma_tx.control, DMA_TX_CONTROL_SEND);
++	CHECK_RET(waitb, ithc, &ithc->regs->dma_tx.control, DMA_TX_CONTROL_SEND, 0);
++	writel(DMA_TX_STATUS_DONE, &ithc->regs->dma_tx.status);
++	return 0;
++}
++int ithc_dma_tx(struct ithc *ithc, u32 cmdcode, u32 datasize, void *data) {
++	mutex_lock(&ithc->dma_tx.mutex);
++	int ret = ithc_dma_tx_unlocked(ithc, cmdcode, datasize, data);
++	mutex_unlock(&ithc->dma_tx.mutex);
++	return ret;
++}
++
+diff --git a/drivers/hid/ithc/ithc-dma.h b/drivers/hid/ithc/ithc-dma.h
+new file mode 100644
+index 000000000000..d9f2c19a13f3
+--- /dev/null
++++ b/drivers/hid/ithc/ithc-dma.h
+@@ -0,0 +1,67 @@
++#define PRD_SIZE_MASK            0xffffff
++#define PRD_FLAG_END             0x1000000
++#define PRD_FLAG_SUCCESS         0x2000000
++#define PRD_FLAG_ERROR           0x4000000
++
++struct ithc_phys_region_desc {
++	u64 addr; // physical addr/1024
++	u32 size; // num bytes, PRD_FLAG_END marks last prd for data split over multiple prds
++	u32 unused;
++};
++
++#define DMA_RX_CODE_INPUT_REPORT          3
++#define DMA_RX_CODE_FEATURE_REPORT        4
++#define DMA_RX_CODE_REPORT_DESCRIPTOR     5
++#define DMA_RX_CODE_RESET                 7
++
++struct ithc_dma_rx_header {
++	u32 code;
++	u32 data_size;
++	u32 _unknown[14];
++};
++
++#define DMA_TX_CODE_SET_FEATURE           3
++#define DMA_TX_CODE_GET_FEATURE           4
++#define DMA_TX_CODE_OUTPUT_REPORT         5
++#define DMA_TX_CODE_GET_REPORT_DESCRIPTOR 7
++
++struct ithc_dma_tx_header {
++	u32 code;
++	u32 data_size;
++};
++
++struct ithc_dma_prd_buffer {
++	void *addr;
++	dma_addr_t dma_addr;
++	u32 size;
++	u32 num_pages; // per data buffer
++	enum dma_data_direction dir;
++};
++
++struct ithc_dma_data_buffer {
++	void *addr;
++	struct sg_table *sgt;
++	int active_idx;
++	u32 data_size;
++};
++
++struct ithc_dma_tx {
++	struct mutex mutex;
++	u32 max_size;
++	struct ithc_dma_prd_buffer prds;
++	struct ithc_dma_data_buffer buf;
++};
++
++struct ithc_dma_rx {
++	struct mutex mutex;
++	u32 num_received;
++	struct ithc_dma_prd_buffer prds;
++	struct ithc_dma_data_buffer bufs[NUM_RX_BUF];
++};
++
++int ithc_dma_rx_init(struct ithc *ithc, u8 channel, const char *devname);
++void ithc_dma_rx_enable(struct ithc *ithc, u8 channel);
++int ithc_dma_tx_init(struct ithc *ithc);
++int ithc_dma_rx(struct ithc *ithc, u8 channel);
++int ithc_dma_tx(struct ithc *ithc, u32 cmdcode, u32 datasize, void *cmddata);
++
+diff --git a/drivers/hid/ithc/ithc-main.c b/drivers/hid/ithc/ithc-main.c
+new file mode 100644
+index 000000000000..09512b9cb4d3
+--- /dev/null
++++ b/drivers/hid/ithc/ithc-main.c
+@@ -0,0 +1,534 @@
++#include "ithc.h"
++
++MODULE_DESCRIPTION("Intel Touch Host Controller driver");
++MODULE_LICENSE("Dual BSD/GPL");
++
++// Lakefield
++#define PCI_DEVICE_ID_INTEL_THC_LKF_PORT1    0x98d0
++#define PCI_DEVICE_ID_INTEL_THC_LKF_PORT2    0x98d1
++// Tiger Lake
++#define PCI_DEVICE_ID_INTEL_THC_TGL_LP_PORT1 0xa0d0
++#define PCI_DEVICE_ID_INTEL_THC_TGL_LP_PORT2 0xa0d1
++#define PCI_DEVICE_ID_INTEL_THC_TGL_H_PORT1  0x43d0
++#define PCI_DEVICE_ID_INTEL_THC_TGL_H_PORT2  0x43d1
++// Alder Lake
++#define PCI_DEVICE_ID_INTEL_THC_ADL_S_PORT1  0x7ad8
++#define PCI_DEVICE_ID_INTEL_THC_ADL_S_PORT2  0x7ad9
++#define PCI_DEVICE_ID_INTEL_THC_ADL_P_PORT1  0x51d0
++#define PCI_DEVICE_ID_INTEL_THC_ADL_P_PORT2  0x51d1
++#define PCI_DEVICE_ID_INTEL_THC_ADL_M_PORT1  0x54d0
++#define PCI_DEVICE_ID_INTEL_THC_ADL_M_PORT2  0x54d1
++// Raptor Lake
++#define PCI_DEVICE_ID_INTEL_THC_RPL_S_PORT1  0x7a58
++#define PCI_DEVICE_ID_INTEL_THC_RPL_S_PORT2  0x7a59
++// Meteor Lake
++#define PCI_DEVICE_ID_INTEL_THC_MTL_PORT1    0x7e48
++#define PCI_DEVICE_ID_INTEL_THC_MTL_PORT2    0x7e4a
++
++static const struct pci_device_id ithc_pci_tbl[] = {
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_LKF_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_LKF_PORT2) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_TGL_LP_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_TGL_LP_PORT2) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_TGL_H_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_TGL_H_PORT2) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_ADL_S_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_ADL_S_PORT2) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_ADL_P_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_ADL_P_PORT2) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_ADL_M_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_ADL_M_PORT2) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_RPL_S_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_RPL_S_PORT2) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_MTL_PORT1) },
++	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_THC_MTL_PORT2) },
++	{}
++};
++MODULE_DEVICE_TABLE(pci, ithc_pci_tbl);
++
++// Module parameters
++
++static bool ithc_use_polling = false;
++module_param_named(poll, ithc_use_polling, bool, 0);
++MODULE_PARM_DESC(poll, "Use polling instead of interrupts");
++
++static bool ithc_use_rx0 = false;
++module_param_named(rx0, ithc_use_rx0, bool, 0);
++MODULE_PARM_DESC(rx0, "Use DMA RX channel 0");
++
++static bool ithc_use_rx1 = true;
++module_param_named(rx1, ithc_use_rx1, bool, 0);
++MODULE_PARM_DESC(rx1, "Use DMA RX channel 1");
++
++static bool ithc_log_regs_enabled = false;
++module_param_named(logregs, ithc_log_regs_enabled, bool, 0);
++MODULE_PARM_DESC(logregs, "Log changes in register values (for debugging)");
++
++// Sysfs attributes
++
++static bool ithc_is_config_valid(struct ithc *ithc) {
++	return ithc->config.device_id == DEVCFG_DEVICE_ID_TIC;
++}
++
++static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf) {
++	struct ithc *ithc = dev_get_drvdata(dev);
++	if (!ithc || !ithc_is_config_valid(ithc)) return -ENODEV;
++	return sprintf(buf, "0x%04x", ithc->config.vendor_id);
++}
++static DEVICE_ATTR_RO(vendor);
++static ssize_t product_show(struct device *dev, struct device_attribute *attr, char *buf) {
++	struct ithc *ithc = dev_get_drvdata(dev);
++	if (!ithc || !ithc_is_config_valid(ithc)) return -ENODEV;
++	return sprintf(buf, "0x%04x", ithc->config.product_id);
++}
++static DEVICE_ATTR_RO(product);
++static ssize_t revision_show(struct device *dev, struct device_attribute *attr, char *buf) {
++	struct ithc *ithc = dev_get_drvdata(dev);
++	if (!ithc || !ithc_is_config_valid(ithc)) return -ENODEV;
++	return sprintf(buf, "%u", ithc->config.revision);
++}
++static DEVICE_ATTR_RO(revision);
++static ssize_t fw_version_show(struct device *dev, struct device_attribute *attr, char *buf) {
++	struct ithc *ithc = dev_get_drvdata(dev);
++	if (!ithc || !ithc_is_config_valid(ithc)) return -ENODEV;
++	u32 v = ithc->config.fw_version;
++	return sprintf(buf, "%i.%i.%i.%i", v >> 24, v >> 16 & 0xff, v >> 8 & 0xff, v & 0xff);
++}
++static DEVICE_ATTR_RO(fw_version);
++
++static const struct attribute_group *ithc_attribute_groups[] = {
++	&(const struct attribute_group){
++		.name = DEVNAME,
++		.attrs = (struct attribute *[]){
++			&dev_attr_vendor.attr,
++			&dev_attr_product.attr,
++			&dev_attr_revision.attr,
++			&dev_attr_fw_version.attr,
++			NULL
++		},
++	},
++	NULL
++};
++
++// HID setup
++
++static int ithc_hid_start(struct hid_device *hdev) { return 0; }
++static void ithc_hid_stop(struct hid_device *hdev) { }
++static int ithc_hid_open(struct hid_device *hdev) { return 0; }
++static void ithc_hid_close(struct hid_device *hdev) { }
++
++static int ithc_hid_parse(struct hid_device *hdev) {
++	struct ithc *ithc = hdev->driver_data;
++	u64 val = 0;
++	WRITE_ONCE(ithc->hid_parse_done, false);
++	CHECK_RET(ithc_dma_tx, ithc, DMA_TX_CODE_GET_REPORT_DESCRIPTOR, sizeof val, &val);
++	if (!wait_event_timeout(ithc->wait_hid_parse, READ_ONCE(ithc->hid_parse_done), msecs_to_jiffies(1000))) return -ETIMEDOUT;
++	return 0;
++}
++
++static int ithc_hid_raw_request(struct hid_device *hdev, unsigned char reportnum, __u8 *buf, size_t len, unsigned char rtype, int reqtype) {
++	struct ithc *ithc = hdev->driver_data;
++	if (!buf || !len) return -EINVAL;
++	u32 code;
++	if (rtype == HID_OUTPUT_REPORT && reqtype == HID_REQ_SET_REPORT) code = DMA_TX_CODE_OUTPUT_REPORT;
++	else if (rtype == HID_FEATURE_REPORT && reqtype == HID_REQ_SET_REPORT) code = DMA_TX_CODE_SET_FEATURE;
++	else if (rtype == HID_FEATURE_REPORT && reqtype == HID_REQ_GET_REPORT) code = DMA_TX_CODE_GET_FEATURE;
++	else {
++		pci_err(ithc->pci, "unhandled hid request %i %i for report id %i\n", rtype, reqtype, reportnum);
++		return -EINVAL;
++	}
++	buf[0] = reportnum;
++	if (reqtype == HID_REQ_GET_REPORT) {
++		mutex_lock(&ithc->hid_get_feature_mutex);
++		ithc->hid_get_feature_buf = buf;
++		ithc->hid_get_feature_size = len;
++		mutex_unlock(&ithc->hid_get_feature_mutex);
++		int r = CHECK(ithc_dma_tx, ithc, code, 1, buf);
++		if (!r) {
++			r = wait_event_interruptible_timeout(ithc->wait_hid_get_feature, !ithc->hid_get_feature_buf, msecs_to_jiffies(1000));
++			if (!r) r = -ETIMEDOUT;
++			else if (r < 0) r = -EINTR;
++			else r = 0;
++		}
++		mutex_lock(&ithc->hid_get_feature_mutex);
++		ithc->hid_get_feature_buf = NULL;
++		if (!r) r = ithc->hid_get_feature_size;
++		mutex_unlock(&ithc->hid_get_feature_mutex);
++		return r;
++	}
++	CHECK_RET(ithc_dma_tx, ithc, code, len, buf);
++	return 0;
++}
++
++static struct hid_ll_driver ithc_ll_driver = {
++	.start = ithc_hid_start,
++	.stop = ithc_hid_stop,
++	.open = ithc_hid_open,
++	.close = ithc_hid_close,
++	.parse = ithc_hid_parse,
++	.raw_request = ithc_hid_raw_request,
++};
++
++static void ithc_hid_devres_release(struct device *dev, void *res) {
++	struct hid_device **hidm = res;
++	if (*hidm) hid_destroy_device(*hidm);
++}
++
++static int ithc_hid_init(struct ithc *ithc) {
++	struct hid_device **hidm = devres_alloc(ithc_hid_devres_release, sizeof *hidm, GFP_KERNEL);
++	if (!hidm) return -ENOMEM;
++	devres_add(&ithc->pci->dev, hidm);
++	struct hid_device *hid = hid_allocate_device();
++	if (IS_ERR(hid)) return PTR_ERR(hid);
++	*hidm = hid;
++
++	strscpy(hid->name, DEVFULLNAME, sizeof(hid->name));
++	strscpy(hid->phys, ithc->phys, sizeof(hid->phys));
++	hid->ll_driver = &ithc_ll_driver;
++	hid->bus = BUS_PCI;
++	hid->vendor = ithc->config.vendor_id;
++	hid->product = ithc->config.product_id;
++	hid->version = 0x100;
++	hid->dev.parent = &ithc->pci->dev;
++	hid->driver_data = ithc;
++
++	ithc->hid = hid;
++	return 0;
++}
++
++// Interrupts/polling
++
++static void ithc_activity_timer_callback(struct timer_list *t) {
++	struct ithc *ithc = container_of(t, struct ithc, activity_timer);
++	cpu_latency_qos_update_request(&ithc->activity_qos, PM_QOS_DEFAULT_VALUE);
++}
++
++void ithc_set_active(struct ithc *ithc) {
++	// When CPU usage is very low, the CPU can enter various low power states (C2-C10).
++	// This disrupts DMA, causing truncated DMA messages. ERROR_FLAG_DMA_UNKNOWN_12 will be set when this happens.
++	// The amount of truncated messages can become very high, resulting in user-visible effects (laggy/stuttering cursor).
++	// To avoid this, we use a CPU latency QoS request to prevent the CPU from entering low power states during touch interactions.
++	cpu_latency_qos_update_request(&ithc->activity_qos, 0);
++	mod_timer(&ithc->activity_timer, jiffies + msecs_to_jiffies(1000));
++}
++
++static int ithc_set_device_enabled(struct ithc *ithc, bool enable) {
++	u32 x = ithc->config.touch_cfg = (ithc->config.touch_cfg & ~(u32)DEVCFG_TOUCH_MASK) | DEVCFG_TOUCH_UNKNOWN_2
++		| (enable ? DEVCFG_TOUCH_ENABLE | DEVCFG_TOUCH_UNKNOWN_3 | DEVCFG_TOUCH_UNKNOWN_4 : 0);
++	return ithc_spi_command(ithc, SPI_CMD_CODE_WRITE, offsetof(struct ithc_device_config, touch_cfg), sizeof x, &x);
++}
++
++static void ithc_disable_interrupts(struct ithc *ithc) {
++	writel(0, &ithc->regs->error_control);
++	bitsb(&ithc->regs->spi_cmd.control, SPI_CMD_CONTROL_IRQ, 0);
++	bitsb(&ithc->regs->dma_rx[0].control, DMA_RX_CONTROL_IRQ_UNKNOWN_1 | DMA_RX_CONTROL_IRQ_ERROR | DMA_RX_CONTROL_IRQ_UNKNOWN_4 | DMA_RX_CONTROL_IRQ_DATA, 0);
++	bitsb(&ithc->regs->dma_rx[1].control, DMA_RX_CONTROL_IRQ_UNKNOWN_1 | DMA_RX_CONTROL_IRQ_ERROR | DMA_RX_CONTROL_IRQ_UNKNOWN_4 | DMA_RX_CONTROL_IRQ_DATA, 0);
++	bitsb(&ithc->regs->dma_tx.control, DMA_TX_CONTROL_IRQ, 0);
++}
++
++static void ithc_clear_dma_rx_interrupts(struct ithc *ithc, unsigned channel) {
++	writel(DMA_RX_STATUS_ERROR | DMA_RX_STATUS_UNKNOWN_4 | DMA_RX_STATUS_HAVE_DATA, &ithc->regs->dma_rx[channel].status);
++}
++
++static void ithc_clear_interrupts(struct ithc *ithc) {
++	writel(0xffffffff, &ithc->regs->error_flags);
++	writel(ERROR_STATUS_DMA | ERROR_STATUS_SPI, &ithc->regs->error_status);
++	writel(SPI_CMD_STATUS_DONE | SPI_CMD_STATUS_ERROR, &ithc->regs->spi_cmd.status);
++	ithc_clear_dma_rx_interrupts(ithc, 0);
++	ithc_clear_dma_rx_interrupts(ithc, 1);
++	writel(DMA_TX_STATUS_DONE | DMA_TX_STATUS_ERROR | DMA_TX_STATUS_UNKNOWN_2, &ithc->regs->dma_tx.status);
++}
++
++static void ithc_process(struct ithc *ithc) {
++	ithc_log_regs(ithc);
++
++	// read and clear error bits
++	u32 err = readl(&ithc->regs->error_flags);
++	if (err) {
++		if (err & ~ERROR_FLAG_DMA_UNKNOWN_12) pci_err(ithc->pci, "error flags: 0x%08x\n", err);
++		writel(err, &ithc->regs->error_flags);
++	}
++
++	// process DMA rx
++	if (ithc_use_rx0) {
++		ithc_clear_dma_rx_interrupts(ithc, 0);
++		ithc_dma_rx(ithc, 0);
++	}
++	if (ithc_use_rx1) {
++		ithc_clear_dma_rx_interrupts(ithc, 1);
++		ithc_dma_rx(ithc, 1);
++	}
++
++	ithc_log_regs(ithc);
++}
++
++static irqreturn_t ithc_interrupt_thread(int irq, void *arg) {
++	struct ithc *ithc = arg;
++	pci_dbg(ithc->pci, "IRQ! err=%08x/%08x/%08x, cmd=%02x/%08x, rx0=%02x/%08x, rx1=%02x/%08x, tx=%02x/%08x\n",
++		readl(&ithc->regs->error_control), readl(&ithc->regs->error_status), readl(&ithc->regs->error_flags),
++		readb(&ithc->regs->spi_cmd.control), readl(&ithc->regs->spi_cmd.status),
++		readb(&ithc->regs->dma_rx[0].control), readl(&ithc->regs->dma_rx[0].status),
++		readb(&ithc->regs->dma_rx[1].control), readl(&ithc->regs->dma_rx[1].status),
++		readb(&ithc->regs->dma_tx.control), readl(&ithc->regs->dma_tx.status));
++	ithc_process(ithc);
++	return IRQ_HANDLED;
++}
++
++static int ithc_poll_thread(void *arg) {
++	struct ithc *ithc = arg;
++	unsigned sleep = 100;
++	while (!kthread_should_stop()) {
++		u32 n = ithc->dma_rx[1].num_received;
++		ithc_process(ithc);
++		if (n != ithc->dma_rx[1].num_received) sleep = 20;
++		else sleep = min(200u, sleep + (sleep >> 4) + 1);
++		msleep_interruptible(sleep);
++	}
++	return 0;
++}
++
++// Device initialization and shutdown
++
++static void ithc_disable(struct ithc *ithc) {
++	bitsl_set(&ithc->regs->control_bits, CONTROL_QUIESCE);
++	CHECK(waitl, ithc, &ithc->regs->control_bits, CONTROL_IS_QUIESCED, CONTROL_IS_QUIESCED);
++	bitsl(&ithc->regs->control_bits, CONTROL_NRESET, 0);
++	bitsb(&ithc->regs->spi_cmd.control, SPI_CMD_CONTROL_SEND, 0);
++	bitsb(&ithc->regs->dma_tx.control, DMA_TX_CONTROL_SEND, 0);
++	bitsb(&ithc->regs->dma_rx[0].control, DMA_RX_CONTROL_ENABLE, 0);
++	bitsb(&ithc->regs->dma_rx[1].control, DMA_RX_CONTROL_ENABLE, 0);
++	ithc_disable_interrupts(ithc);
++	ithc_clear_interrupts(ithc);
++}
++
++static int ithc_init_device(struct ithc *ithc) {
++	ithc_log_regs(ithc);
++	bool was_enabled = (readl(&ithc->regs->control_bits) & CONTROL_NRESET) != 0;
++	ithc_disable(ithc);
++	CHECK_RET(waitl, ithc, &ithc->regs->control_bits, CONTROL_READY, CONTROL_READY);
++	ithc_set_spi_config(ithc, 10, 0);
++	bitsl_set(&ithc->regs->dma_rx[0].unknown_init_bits, 0x80000000); // seems to help with reading config
++
++	if (was_enabled) if (msleep_interruptible(100)) return -EINTR;
++	bitsl(&ithc->regs->control_bits, CONTROL_QUIESCE, 0);
++	CHECK_RET(waitl, ithc, &ithc->regs->control_bits, CONTROL_IS_QUIESCED, 0);
++	for (int retries = 0; ; retries++) {
++		ithc_log_regs(ithc);
++		bitsl_set(&ithc->regs->control_bits, CONTROL_NRESET);
++		if (!waitl(ithc, &ithc->regs->state, 0xf, 2)) break;
++		if (retries > 5) {
++			pci_err(ithc->pci, "too many retries, failed to reset device\n");
++			return -ETIMEDOUT;
++		}
++		pci_err(ithc->pci, "invalid state, retrying reset\n");
++		bitsl(&ithc->regs->control_bits, CONTROL_NRESET, 0);
++		if (msleep_interruptible(1000)) return -EINTR;
++	}
++	ithc_log_regs(ithc);
++
++	CHECK(waitl, ithc, &ithc->regs->dma_rx[0].status, DMA_RX_STATUS_UNKNOWN_4, DMA_RX_STATUS_UNKNOWN_4);
++
++	// read config
++	for (int retries = 0; ; retries++) {
++		ithc_log_regs(ithc);
++		memset(&ithc->config, 0, sizeof ithc->config);
++		CHECK_RET(ithc_spi_command, ithc, SPI_CMD_CODE_READ, 0, sizeof ithc->config, &ithc->config);
++		u32 *p = (void *)&ithc->config;
++		pci_info(ithc->pci, "config: %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
++			p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
++		if (ithc_is_config_valid(ithc)) break;
++		if (retries > 10) {
++			pci_err(ithc->pci, "failed to read config, unknown device ID 0x%08x\n", ithc->config.device_id);
++			return -EIO;
++		}
++		pci_err(ithc->pci, "failed to read config, retrying\n");
++		if (msleep_interruptible(100)) return -EINTR;
++	}
++	ithc_log_regs(ithc);
++
++	CHECK_RET(ithc_set_spi_config, ithc, DEVCFG_SPI_MAX_FREQ(ithc->config.spi_config), DEVCFG_SPI_MODE(ithc->config.spi_config));
++	CHECK_RET(ithc_set_device_enabled, ithc, true);
++	ithc_log_regs(ithc);
++	return 0;
++}
++
++int ithc_reset(struct ithc *ithc) {
++	// FIXME This should probably do devres_release_group()+ithc_start(). But because this is called during DMA
++	// processing, that would have to be done asynchronously (schedule_work()?). And with extra locking?
++	pci_err(ithc->pci, "reset\n");
++	CHECK(ithc_init_device, ithc);
++	if (ithc_use_rx0) ithc_dma_rx_enable(ithc, 0);
++	if (ithc_use_rx1) ithc_dma_rx_enable(ithc, 1);
++	ithc_log_regs(ithc);
++	pci_dbg(ithc->pci, "reset completed\n");
++	return 0;
++}
++
++static void ithc_stop(void *res) {
++	struct ithc *ithc = res;
++	pci_dbg(ithc->pci, "stopping\n");
++	ithc_log_regs(ithc);
++	if (ithc->poll_thread) CHECK(kthread_stop, ithc->poll_thread);
++	if (ithc->irq >= 0) disable_irq(ithc->irq);
++	CHECK(ithc_set_device_enabled, ithc, false);
++	ithc_disable(ithc);
++	del_timer_sync(&ithc->activity_timer);
++	cpu_latency_qos_remove_request(&ithc->activity_qos);
++	// clear dma config
++	for(unsigned i = 0; i < 2; i++) {
++		CHECK(waitl, ithc, &ithc->regs->dma_rx[i].status, DMA_RX_STATUS_ENABLED, 0);
++		lo_hi_writeq(0, &ithc->regs->dma_rx[i].addr);
++		writeb(0, &ithc->regs->dma_rx[i].num_bufs);
++		writeb(0, &ithc->regs->dma_rx[i].num_prds);
++	}
++	lo_hi_writeq(0, &ithc->regs->dma_tx.addr);
++	writeb(0, &ithc->regs->dma_tx.num_prds);
++	ithc_log_regs(ithc);
++	pci_dbg(ithc->pci, "stopped\n");
++}
++
++static void ithc_clear_drvdata(void *res) {
++	struct pci_dev *pci = res;
++	pci_set_drvdata(pci, NULL);
++}
++
++static int ithc_start(struct pci_dev *pci) {
++	pci_dbg(pci, "starting\n");
++	if (pci_get_drvdata(pci)) {
++		pci_err(pci, "device already initialized\n");
++		return -EINVAL;
++	}
++	if (!devres_open_group(&pci->dev, ithc_start, GFP_KERNEL)) return -ENOMEM;
++
++	struct ithc *ithc = devm_kzalloc(&pci->dev, sizeof *ithc, GFP_KERNEL);
++	if (!ithc) return -ENOMEM;
++	ithc->irq = -1;
++	ithc->pci = pci;
++	snprintf(ithc->phys, sizeof ithc->phys, "pci-%s/" DEVNAME, pci_name(pci));
++	init_waitqueue_head(&ithc->wait_hid_parse);
++	init_waitqueue_head(&ithc->wait_hid_get_feature);
++	mutex_init(&ithc->hid_get_feature_mutex);
++	pci_set_drvdata(pci, ithc);
++	CHECK_RET(devm_add_action_or_reset, &pci->dev, ithc_clear_drvdata, pci);
++	if (ithc_log_regs_enabled) ithc->prev_regs = devm_kzalloc(&pci->dev, sizeof *ithc->prev_regs, GFP_KERNEL);
++
++	CHECK_RET(pcim_enable_device, pci);
++	pci_set_master(pci);
++	CHECK_RET(pcim_iomap_regions, pci, BIT(0), DEVNAME " regs");
++	CHECK_RET(dma_set_mask_and_coherent, &pci->dev, DMA_BIT_MASK(64));
++	CHECK_RET(pci_set_power_state, pci, PCI_D0);
++	ithc->regs = pcim_iomap_table(pci)[0];
++
++	if (!ithc_use_polling) {
++		CHECK_RET(pci_alloc_irq_vectors, pci, 1, 1, PCI_IRQ_MSI | PCI_IRQ_MSIX);
++		ithc->irq = CHECK(pci_irq_vector, pci, 0);
++		if (ithc->irq < 0) return ithc->irq;
++	}
++
++	CHECK_RET(ithc_init_device, ithc);
++	CHECK(devm_device_add_groups, &pci->dev, ithc_attribute_groups);
++	if (ithc_use_rx0) CHECK_RET(ithc_dma_rx_init, ithc, 0, ithc_use_rx1 ? DEVNAME "0" : DEVNAME);
++	if (ithc_use_rx1) CHECK_RET(ithc_dma_rx_init, ithc, 1, ithc_use_rx0 ? DEVNAME "1" : DEVNAME);
++	CHECK_RET(ithc_dma_tx_init, ithc);
++
++	CHECK_RET(ithc_hid_init, ithc);
++
++	cpu_latency_qos_add_request(&ithc->activity_qos, PM_QOS_DEFAULT_VALUE);
++	timer_setup(&ithc->activity_timer, ithc_activity_timer_callback, 0);
++
++	// add ithc_stop callback AFTER setting up DMA buffers, so that polling/irqs/DMA are disabled BEFORE the buffers are freed
++	CHECK_RET(devm_add_action_or_reset, &pci->dev, ithc_stop, ithc);
++
++	if (ithc_use_polling) {
++		pci_info(pci, "using polling instead of irq\n");
++		// use a thread instead of simple timer because we want to be able to sleep
++		ithc->poll_thread = kthread_run(ithc_poll_thread, ithc, DEVNAME "poll");
++		if (IS_ERR(ithc->poll_thread)) {
++			int err = PTR_ERR(ithc->poll_thread);
++			ithc->poll_thread = NULL;
++			return err;
++		}
++	} else {
++		CHECK_RET(devm_request_threaded_irq, &pci->dev, ithc->irq, NULL, ithc_interrupt_thread, IRQF_TRIGGER_HIGH | IRQF_ONESHOT, DEVNAME, ithc);
++	}
++
++	if (ithc_use_rx0) ithc_dma_rx_enable(ithc, 0);
++	if (ithc_use_rx1) ithc_dma_rx_enable(ithc, 1);
++
++	// hid_add_device can only be called after irq/polling is started and DMA is enabled, because it calls ithc_hid_parse which reads the report descriptor via DMA
++	CHECK_RET(hid_add_device, ithc->hid);
++
++	CHECK(ithc_debug_init, ithc);
++
++	pci_dbg(pci, "started\n");
++	return 0;
++}
++
++static int ithc_probe(struct pci_dev *pci, const struct pci_device_id *id) {
++	pci_dbg(pci, "device probe\n");
++	return ithc_start(pci);
++}
++
++static void ithc_remove(struct pci_dev *pci) {
++	pci_dbg(pci, "device remove\n");
++	// all cleanup is handled by devres
++}
++
++static int ithc_suspend(struct device *dev) {
++	struct pci_dev *pci = to_pci_dev(dev);
++	pci_dbg(pci, "pm suspend\n");
++	devres_release_group(dev, ithc_start);
++	return 0;
++}
++
++static int ithc_resume(struct device *dev) {
++	struct pci_dev *pci = to_pci_dev(dev);
++	pci_dbg(pci, "pm resume\n");
++	return ithc_start(pci);
++}
++
++static int ithc_freeze(struct device *dev) {
++	struct pci_dev *pci = to_pci_dev(dev);
++	pci_dbg(pci, "pm freeze\n");
++	devres_release_group(dev, ithc_start);
++	return 0;
++}
++
++static int ithc_thaw(struct device *dev) {
++	struct pci_dev *pci = to_pci_dev(dev);
++	pci_dbg(pci, "pm thaw\n");
++	return ithc_start(pci);
++}
++
++static int ithc_restore(struct device *dev) {
++	struct pci_dev *pci = to_pci_dev(dev);
++	pci_dbg(pci, "pm restore\n");
++	return ithc_start(pci);
++}
++
++static struct pci_driver ithc_driver = {
++	.name = DEVNAME,
++	.id_table = ithc_pci_tbl,
++	.probe = ithc_probe,
++	.remove = ithc_remove,
++	.driver.pm = &(const struct dev_pm_ops) {
++		.suspend = ithc_suspend,
++		.resume = ithc_resume,
++		.freeze = ithc_freeze,
++		.thaw = ithc_thaw,
++		.restore = ithc_restore,
++	},
++	//.dev_groups = ithc_attribute_groups, // could use this (since 5.14), however the attributes won't have valid values until config has been read anyway
++};
++
++static int __init ithc_init(void) {
++	return pci_register_driver(&ithc_driver);
++}
++
++static void __exit ithc_exit(void) {
++	pci_unregister_driver(&ithc_driver);
++}
++
++module_init(ithc_init);
++module_exit(ithc_exit);
++
+diff --git a/drivers/hid/ithc/ithc-regs.c b/drivers/hid/ithc/ithc-regs.c
+new file mode 100644
+index 000000000000..85d567b05761
+--- /dev/null
++++ b/drivers/hid/ithc/ithc-regs.c
+@@ -0,0 +1,64 @@
++#include "ithc.h"
++
++#define reg_num(r) (0x1fff & (u16)(__force u64)(r))
++
++void bitsl(__iomem u32 *reg, u32 mask, u32 val) {
++	if (val & ~mask) pr_err("register 0x%x: invalid value 0x%x for bitmask 0x%x\n", reg_num(reg), val, mask);
++	writel((readl(reg) & ~mask) | (val & mask), reg);
++}
++
++void bitsb(__iomem u8 *reg, u8 mask, u8 val) {
++	if (val & ~mask) pr_err("register 0x%x: invalid value 0x%x for bitmask 0x%x\n", reg_num(reg), val, mask);
++	writeb((readb(reg) & ~mask) | (val & mask), reg);
++}
++
++int waitl(struct ithc *ithc, __iomem u32 *reg, u32 mask, u32 val) {
++	pci_dbg(ithc->pci, "waiting for reg 0x%04x mask 0x%08x val 0x%08x\n", reg_num(reg), mask, val);
++	u32 x;
++	if (readl_poll_timeout(reg, x, (x & mask) == val, 200, 1000*1000)) {
++		pci_err(ithc->pci, "timed out waiting for reg 0x%04x mask 0x%08x val 0x%08x\n", reg_num(reg), mask, val);
++		return -ETIMEDOUT;
++	}
++	pci_dbg(ithc->pci, "done waiting\n");
++	return 0;
++}
++
++int waitb(struct ithc *ithc, __iomem u8 *reg, u8 mask, u8 val) {
++	pci_dbg(ithc->pci, "waiting for reg 0x%04x mask 0x%02x val 0x%02x\n", reg_num(reg), mask, val);
++	u8 x;
++	if (readb_poll_timeout(reg, x, (x & mask) == val, 200, 1000*1000)) {
++		pci_err(ithc->pci, "timed out waiting for reg 0x%04x mask 0x%02x val 0x%02x\n", reg_num(reg), mask, val);
++		return -ETIMEDOUT;
++	}
++	pci_dbg(ithc->pci, "done waiting\n");
++	return 0;
++}
++
++int ithc_set_spi_config(struct ithc *ithc, u8 speed, u8 mode) {
++	pci_dbg(ithc->pci, "setting SPI speed to %i, mode %i\n", speed, mode);
++	if (mode == 3) mode = 2;
++	bitsl(&ithc->regs->spi_config,
++		SPI_CONFIG_MODE(0xff) | SPI_CONFIG_SPEED(0xff) | SPI_CONFIG_UNKNOWN_18(0xff) | SPI_CONFIG_SPEED2(0xff),
++		SPI_CONFIG_MODE(mode) | SPI_CONFIG_SPEED(speed) | SPI_CONFIG_UNKNOWN_18(0) | SPI_CONFIG_SPEED2(speed));
++	return 0;
++}
++
++int ithc_spi_command(struct ithc *ithc, u8 command, u32 offset, u32 size, void *data) {
++	pci_dbg(ithc->pci, "SPI command %u, size %u, offset %u\n", command, size, offset);
++	if (size > sizeof ithc->regs->spi_cmd.data) return -EINVAL;
++	CHECK_RET(waitl, ithc, &ithc->regs->spi_cmd.status, SPI_CMD_STATUS_BUSY, 0);
++	writel(SPI_CMD_STATUS_DONE | SPI_CMD_STATUS_ERROR, &ithc->regs->spi_cmd.status);
++	writeb(command, &ithc->regs->spi_cmd.code);
++	writew(size, &ithc->regs->spi_cmd.size);
++	writel(offset, &ithc->regs->spi_cmd.offset);
++	u32 *p = data, n = (size + 3) / 4;
++	for (u32 i = 0; i < n; i++) writel(p[i], &ithc->regs->spi_cmd.data[i]);
++	bitsb_set(&ithc->regs->spi_cmd.control, SPI_CMD_CONTROL_SEND);
++	CHECK_RET(waitl, ithc, &ithc->regs->spi_cmd.status, SPI_CMD_STATUS_BUSY, 0);
++	if ((readl(&ithc->regs->spi_cmd.status) & (SPI_CMD_STATUS_DONE | SPI_CMD_STATUS_ERROR)) != SPI_CMD_STATUS_DONE) return -EIO;
++	if (readw(&ithc->regs->spi_cmd.size) != size) return -EMSGSIZE;
++	for (u32 i = 0; i < n; i++) p[i] = readl(&ithc->regs->spi_cmd.data[i]);
++	writel(SPI_CMD_STATUS_DONE | SPI_CMD_STATUS_ERROR, &ithc->regs->spi_cmd.status);
++	return 0;
++}
++
+diff --git a/drivers/hid/ithc/ithc-regs.h b/drivers/hid/ithc/ithc-regs.h
+new file mode 100644
+index 000000000000..1a96092ed7ee
+--- /dev/null
++++ b/drivers/hid/ithc/ithc-regs.h
+@@ -0,0 +1,186 @@
++#define CONTROL_QUIESCE                     BIT(1)
++#define CONTROL_IS_QUIESCED                 BIT(2)
++#define CONTROL_NRESET                      BIT(3)
++#define CONTROL_READY                       BIT(29)
++
++#define SPI_CONFIG_MODE(x)                  (((x) & 3) << 2)
++#define SPI_CONFIG_SPEED(x)                 (((x) & 7) << 4)
++#define SPI_CONFIG_UNKNOWN_18(x)            (((x) & 3) << 18)
++#define SPI_CONFIG_SPEED2(x)                (((x) & 0xf) << 20) // high bit = high speed mode?
++
++#define ERROR_CONTROL_UNKNOWN_0             BIT(0)
++#define ERROR_CONTROL_DISABLE_DMA           BIT(1) // clears DMA_RX_CONTROL_ENABLE when a DMA error occurs
++#define ERROR_CONTROL_UNKNOWN_2             BIT(2)
++#define ERROR_CONTROL_UNKNOWN_3             BIT(3)
++#define ERROR_CONTROL_IRQ_DMA_UNKNOWN_9     BIT(9)
++#define ERROR_CONTROL_IRQ_DMA_UNKNOWN_10    BIT(10)
++#define ERROR_CONTROL_IRQ_DMA_UNKNOWN_12    BIT(12)
++#define ERROR_CONTROL_IRQ_DMA_UNKNOWN_13    BIT(13)
++#define ERROR_CONTROL_UNKNOWN_16(x)         (((x) & 0xff) << 16) // spi error code irq?
++#define ERROR_CONTROL_SET_DMA_STATUS        BIT(29) // sets DMA_RX_STATUS_ERROR when a DMA error occurs
++
++#define ERROR_STATUS_DMA                    BIT(28)
++#define ERROR_STATUS_SPI                    BIT(30)
++
++#define ERROR_FLAG_DMA_UNKNOWN_9            BIT(9)
++#define ERROR_FLAG_DMA_UNKNOWN_10           BIT(10)
++#define ERROR_FLAG_DMA_UNKNOWN_12           BIT(12) // set when we receive a truncated DMA message
++#define ERROR_FLAG_DMA_UNKNOWN_13           BIT(13)
++#define ERROR_FLAG_SPI_BUS_TURNAROUND       BIT(16)
++#define ERROR_FLAG_SPI_RESPONSE_TIMEOUT     BIT(17)
++#define ERROR_FLAG_SPI_INTRA_PACKET_TIMEOUT BIT(18)
++#define ERROR_FLAG_SPI_INVALID_RESPONSE     BIT(19)
++#define ERROR_FLAG_SPI_HS_RX_TIMEOUT        BIT(20)
++#define ERROR_FLAG_SPI_TOUCH_IC_INIT        BIT(21)
++
++#define SPI_CMD_CONTROL_SEND                BIT(0) // cleared by device when sending is complete
++#define SPI_CMD_CONTROL_IRQ                 BIT(1)
++
++#define SPI_CMD_CODE_READ                   4
++#define SPI_CMD_CODE_WRITE                  6
++
++#define SPI_CMD_STATUS_DONE                 BIT(0)
++#define SPI_CMD_STATUS_ERROR                BIT(1)
++#define SPI_CMD_STATUS_BUSY                 BIT(3)
++
++#define DMA_TX_CONTROL_SEND                 BIT(0) // cleared by device when sending is complete
++#define DMA_TX_CONTROL_IRQ                  BIT(3)
++
++#define DMA_TX_STATUS_DONE                  BIT(0)
++#define DMA_TX_STATUS_ERROR                 BIT(1)
++#define DMA_TX_STATUS_UNKNOWN_2             BIT(2)
++#define DMA_TX_STATUS_UNKNOWN_3             BIT(3) // busy?
++
++#define DMA_RX_CONTROL_ENABLE               BIT(0)
++#define DMA_RX_CONTROL_IRQ_UNKNOWN_1        BIT(1) // rx1 only?
++#define DMA_RX_CONTROL_IRQ_ERROR            BIT(3) // rx1 only?
++#define DMA_RX_CONTROL_IRQ_UNKNOWN_4        BIT(4) // rx0 only?
++#define DMA_RX_CONTROL_IRQ_DATA             BIT(5)
++
++#define DMA_RX_CONTROL2_UNKNOWN_5           BIT(5) // rx0 only?
++#define DMA_RX_CONTROL2_RESET               BIT(7) // resets ringbuffer indices
++
++#define DMA_RX_WRAP_FLAG                    BIT(7)
++
++#define DMA_RX_STATUS_ERROR                 BIT(3)
++#define DMA_RX_STATUS_UNKNOWN_4             BIT(4) // set in rx0 after using CONTROL_NRESET when it becomes possible to read config (can take >100ms)
++#define DMA_RX_STATUS_HAVE_DATA             BIT(5)
++#define DMA_RX_STATUS_ENABLED               BIT(8)
++
++#define COUNTER_RESET                       BIT(31)
++
++struct ithc_registers {
++	/* 0000 */ u32 _unknown_0000[1024];
++	/* 1000 */ u32 _unknown_1000;
++	/* 1004 */ u32 _unknown_1004;
++	/* 1008 */ u32 control_bits;
++	/* 100c */ u32 _unknown_100c;
++	/* 1010 */ u32 spi_config;
++	/* 1014 */ u32 _unknown_1014[3];
++	/* 1020 */ u32 error_control;
++	/* 1024 */ u32 error_status; // write to clear
++	/* 1028 */ u32 error_flags; // write to clear
++	/* 102c */ u32 _unknown_102c[5];
++	struct {
++		/* 1040 */ u8 control;
++		/* 1041 */ u8 code;
++		/* 1042 */ u16 size;
++		/* 1044 */ u32 status; // write to clear
++		/* 1048 */ u32 offset;
++		/* 104c */ u32 data[16];
++		/* 108c */ u32 _unknown_108c;
++	} spi_cmd;
++	struct {
++		/* 1090 */ u64 addr; // cannot be written with writeq(), must use lo_hi_writeq()
++		/* 1098 */ u8 control;
++		/* 1099 */ u8 _unknown_1099;
++		/* 109a */ u8 _unknown_109a;
++		/* 109b */ u8 num_prds;
++		/* 109c */ u32 status; // write to clear
++	} dma_tx;
++	/* 10a0 */ u32 _unknown_10a0[7];
++	/* 10bc */ u32 state; // is 0xe0000402 (dev config val 0) after CONTROL_NRESET, 0xe0000461 after first touch, 0xe0000401 after DMA_RX_CODE_RESET
++	/* 10c0 */ u32 _unknown_10c0[8];
++	/* 10e0 */ u32 _unknown_10e0_counters[3];
++	/* 10ec */ u32 _unknown_10ec[5];
++	struct {
++		/* 1100/1200 */ u64 addr; // cannot be written with writeq(), must use lo_hi_writeq()
++		/* 1108/1208 */ u8 num_bufs;
++		/* 1109/1209 */ u8 num_prds;
++		/* 110a/120a */ u16 _unknown_110a;
++		/* 110c/120c */ u8 control;
++		/* 110d/120d */ u8 head;
++		/* 110e/120e */ u8 tail;
++		/* 110f/120f */ u8 control2;
++		/* 1110/1210 */ u32 status; // write to clear
++		/* 1114/1214 */ u32 _unknown_1114;
++		/* 1118/1218 */ u64 _unknown_1118_guc_addr;
++		/* 1120/1220 */ u32 _unknown_1120_guc;
++		/* 1124/1224 */ u32 _unknown_1124_guc;
++		/* 1128/1228 */ u32 unknown_init_bits; // bit 2 = guc related, bit 3 = rx1 related, bit 4 = guc related
++		/* 112c/122c */ u32 _unknown_112c;
++		/* 1130/1230 */ u64 _unknown_1130_guc_addr;
++		/* 1138/1238 */ u32 _unknown_1138_guc;
++		/* 113c/123c */ u32 _unknown_113c;
++		/* 1140/1240 */ u32 _unknown_1140_guc;
++		/* 1144/1244 */ u32 _unknown_1144[23];
++		/* 11a0/12a0 */ u32 _unknown_11a0_counters[6];
++		/* 11b8/12b8 */ u32 _unknown_11b8[18];
++	} dma_rx[2];
++};
++static_assert(sizeof(struct ithc_registers) == 0x1300);
++
++#define DEVCFG_DMA_RX_SIZE(x)          ((((x) & 0x3fff) + 1) << 6)
++#define DEVCFG_DMA_TX_SIZE(x)          (((((x) >> 14) & 0x3ff) + 1) << 6)
++
++#define DEVCFG_TOUCH_MASK              0x3f
++#define DEVCFG_TOUCH_ENABLE            BIT(0)
++#define DEVCFG_TOUCH_UNKNOWN_1         BIT(1)
++#define DEVCFG_TOUCH_UNKNOWN_2         BIT(2)
++#define DEVCFG_TOUCH_UNKNOWN_3         BIT(3)
++#define DEVCFG_TOUCH_UNKNOWN_4         BIT(4)
++#define DEVCFG_TOUCH_UNKNOWN_5         BIT(5)
++#define DEVCFG_TOUCH_UNKNOWN_6         BIT(6)
++
++#define DEVCFG_DEVICE_ID_TIC           0x43495424 // "$TIC"
++
++#define DEVCFG_SPI_MAX_FREQ(x)         (((x) >> 1) & 0xf) // high bit = use high speed mode?
++#define DEVCFG_SPI_MODE(x)             (((x) >> 6) & 3)
++#define DEVCFG_SPI_UNKNOWN_8(x)        (((x) >> 8) & 0x3f)
++#define DEVCFG_SPI_NEEDS_HEARTBEAT     BIT(20)
++#define DEVCFG_SPI_HEARTBEAT_INTERVAL  (((x) >> 21) & 7)
++#define DEVCFG_SPI_UNKNOWN_25          BIT(25)
++#define DEVCFG_SPI_UNKNOWN_26          BIT(26)
++#define DEVCFG_SPI_UNKNOWN_27          BIT(27)
++#define DEVCFG_SPI_DELAY               (((x) >> 28) & 7)
++#define DEVCFG_SPI_USE_EXT_READ_CFG    BIT(31)
++
++struct ithc_device_config {
++	u32 _unknown_00;      // 00 = 0xe0000402 (0xe0000401 after DMA_RX_CODE_RESET)
++	u32 _unknown_04;      // 04 = 0x00000000
++	u32 dma_buf_sizes;    // 08 = 0x000a00ff
++	u32 touch_cfg;        // 0c = 0x0000001c
++	u32 _unknown_10;      // 10 = 0x0000001c
++	u32 device_id;        // 14 = 0x43495424 = "$TIC"
++	u32 spi_config;       // 18 = 0xfda00a2e
++	u16 vendor_id;        // 1c = 0x045e = Microsoft Corp.
++	u16 product_id;       // 1e = 0x0c1a
++	u32 revision;         // 20 = 0x00000001
++	u32 fw_version;       // 24 = 0x05008a8b = 5.0.138.139
++	u32 _unknown_28;      // 28 = 0x00000000
++	u32 fw_mode;          // 2c = 0x00000000
++	u32 _unknown_30;      // 30 = 0x00000000
++	u32 _unknown_34;      // 34 = 0x0404035e (u8,u8,u8,u8 = version?)
++	u32 _unknown_38;      // 38 = 0x000001c0 (0x000001c1 after DMA_RX_CODE_RESET)
++	u32 _unknown_3c;      // 3c = 0x00000002
++};
++
++void bitsl(__iomem u32 *reg, u32 mask, u32 val);
++void bitsb(__iomem u8 *reg, u8 mask, u8 val);
++#define bitsl_set(reg, x) bitsl(reg, x, x)
++#define bitsb_set(reg, x) bitsb(reg, x, x)
++int waitl(struct ithc *ithc, __iomem u32 *reg, u32 mask, u32 val);
++int waitb(struct ithc *ithc, __iomem u8 *reg, u8 mask, u8 val);
++int ithc_set_spi_config(struct ithc *ithc, u8 speed, u8 mode);
++int ithc_spi_command(struct ithc *ithc, u8 command, u32 offset, u32 size, void *data);
++
+diff --git a/drivers/hid/ithc/ithc.h b/drivers/hid/ithc/ithc.h
+new file mode 100644
+index 000000000000..6a9b0d480bc1
+--- /dev/null
++++ b/drivers/hid/ithc/ithc.h
+@@ -0,0 +1,60 @@
++#include <linux/module.h>
++#include <linux/input.h>
++#include <linux/hid.h>
++#include <linux/dma-mapping.h>
++#include <linux/highmem.h>
++#include <linux/pci.h>
++#include <linux/io-64-nonatomic-lo-hi.h>
++#include <linux/iopoll.h>
++#include <linux/delay.h>
++#include <linux/kthread.h>
++#include <linux/miscdevice.h>
++#include <linux/debugfs.h>
++#include <linux/poll.h>
++#include <linux/timer.h>
++#include <linux/pm_qos.h>
++
++#define DEVNAME "ithc"
++#define DEVFULLNAME "Intel Touch Host Controller"
++
++#undef pr_fmt
++#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
++
++#define CHECK(fn, ...) ({ int r = fn(__VA_ARGS__); if (r < 0) pci_err(ithc->pci, "%s: %s failed with %i\n", __func__, #fn, r); r; })
++#define CHECK_RET(...) do { int r = CHECK(__VA_ARGS__); if (r < 0) return r; } while(0)
++
++#define NUM_RX_BUF 16
++
++struct ithc;
++
++#include "ithc-regs.h"
++#include "ithc-dma.h"
++
++struct ithc {
++	char phys[32];
++	struct pci_dev *pci;
++	int irq;
++	struct task_struct *poll_thread;
++	struct pm_qos_request activity_qos;
++	struct timer_list activity_timer;
++
++	struct hid_device *hid;
++	bool hid_parse_done;
++	wait_queue_head_t wait_hid_parse;
++	wait_queue_head_t wait_hid_get_feature;
++	struct mutex hid_get_feature_mutex;
++	void *hid_get_feature_buf;
++	size_t hid_get_feature_size;
++
++	struct ithc_registers __iomem *regs;
++	struct ithc_registers *prev_regs; // for debugging
++	struct ithc_device_config config;
++	struct ithc_dma_rx dma_rx[2];
++	struct ithc_dma_tx dma_tx;
++};
++
++int ithc_reset(struct ithc *ithc);
++void ithc_set_active(struct ithc *ithc);
++int ithc_debug_init(struct ithc *ithc);
++void ithc_log_regs(struct ithc *ithc);
++
+-- 
+2.41.0
+

patches/6.4/0006-surface-sam-over-hid.patch

@@ -0,0 +1,335 @@
+From bbb9ed13e01e4520c4cb5f68ee849d957ddced15 Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Sat, 25 Jul 2020 17:19:53 +0200
+Subject: [PATCH] i2c: acpi: Implement RawBytes read access
+
+Microsoft Surface Pro 4 and Book 1 devices access the MSHW0030 I2C
+device via a generic serial bus operation region and RawBytes read
+access. On the Surface Book 1, this access is required to turn on (and
+off) the discrete GPU.
+
+Multiple things are to note here:
+
+a) The RawBytes access is device/driver dependent. The ACPI
+   specification states:
+
+   > Raw accesses assume that the writer has knowledge of the bus that
+   > the access is made over and the device that is being accessed. The
+   > protocol may only ensure that the buffer is transmitted to the
+   > appropriate driver, but the driver must be able to interpret the
+   > buffer to communicate to a register.
+
+   Thus this implementation may likely not work on other devices
+   accessing I2C via the RawBytes accessor type.
+
+b) The MSHW0030 I2C device is an HID-over-I2C device which seems to
+   serve multiple functions:
+
+   1. It is the main access point for the legacy-type Surface Aggregator
+      Module (also referred to as SAM-over-HID, as opposed to the newer
+      SAM-over-SSH/UART). It has currently not been determined on how
+      support for the legacy SAM should be implemented. Likely via a
+      custom HID driver.
+
+   2. It seems to serve as the HID device for the Integrated Sensor Hub.
+      This might complicate matters with regards to implementing a
+      SAM-over-HID driver required by legacy SAM.
+
+In light of this, the simplest approach has been chosen for now.
+However, it may make more sense regarding breakage and compatibility to
+either provide functionality for replacing or enhancing the default
+operation region handler via some additional API functions, or even to
+completely blacklist MSHW0030 from the I2C core and provide a custom
+driver for it.
+
+Replacing/enhancing the default operation region handler would, however,
+either require some sort of secondary driver and access point for it,
+from which the new API functions would be called and the new handler
+(part) would be installed, or hard-coding them via some sort of
+quirk-like interface into the I2C core.
+
+Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
+Patchset: surface-sam-over-hid
+---
+ drivers/i2c/i2c-core-acpi.c | 35 +++++++++++++++++++++++++++++++++++
+ 1 file changed, 35 insertions(+)
+
+diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
+index d6037a328669..a290ebc77aea 100644
+--- a/drivers/i2c/i2c-core-acpi.c
++++ b/drivers/i2c/i2c-core-acpi.c
+@@ -628,6 +628,28 @@ static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
+ 	return (ret == 1) ? 0 : -EIO;
+ }
+ 
++static int acpi_gsb_i2c_write_raw_bytes(struct i2c_client *client,
++		u8 *data, u8 data_len)
++{
++	struct i2c_msg msgs[1];
++	int ret = AE_OK;
++
++	msgs[0].addr = client->addr;
++	msgs[0].flags = client->flags;
++	msgs[0].len = data_len + 1;
++	msgs[0].buf = data;
++
++	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
++
++	if (ret < 0) {
++		dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
++		return ret;
++	}
++
++	/* 1 transfer must have completed successfully */
++	return (ret == 1) ? 0 : -EIO;
++}
++
+ static acpi_status
+ i2c_acpi_space_handler(u32 function, acpi_physical_address command,
+ 			u32 bits, u64 *value64,
+@@ -729,6 +751,19 @@ i2c_acpi_space_handler(u32 function, acpi_physical_address command,
+ 		}
+ 		break;
+ 
++	case ACPI_GSB_ACCESS_ATTRIB_RAW_BYTES:
++		if (action == ACPI_READ) {
++			dev_warn(&adapter->dev,
++				 "protocol 0x%02x not supported for client 0x%02x\n",
++				 accessor_type, client->addr);
++			ret = AE_BAD_PARAMETER;
++			goto err;
++		} else {
++			status = acpi_gsb_i2c_write_raw_bytes(client,
++					gsb->data, info->access_length);
++		}
++		break;
++
+ 	default:
+ 		dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
+ 			 accessor_type, client->addr);
+-- 
+2.41.0
+
+From f9fa5a1f607e9065c5768aa11575acec40f9062b Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Sat, 13 Feb 2021 16:41:18 +0100
+Subject: [PATCH] platform/surface: Add driver for Surface Book 1 dGPU switch
+
+Add driver exposing the discrete GPU power-switch of the  Microsoft
+Surface Book 1 to user-space.
+
+On the Surface Book 1, the dGPU power is controlled via the Surface
+System Aggregator Module (SAM). The specific SAM-over-HID command for
+this is exposed via ACPI. This module provides a simple driver exposing
+the ACPI call via a sysfs parameter to user-space, so that users can
+easily power-on/-off the dGPU.
+
+Patchset: surface-sam-over-hid
+---
+ drivers/platform/surface/Kconfig              |   7 +
+ drivers/platform/surface/Makefile             |   1 +
+ .../surface/surfacebook1_dgpu_switch.c        | 162 ++++++++++++++++++
+ 3 files changed, 170 insertions(+)
+ create mode 100644 drivers/platform/surface/surfacebook1_dgpu_switch.c
+
+diff --git a/drivers/platform/surface/Kconfig b/drivers/platform/surface/Kconfig
+index b629e82af97c..68656e8f309e 100644
+--- a/drivers/platform/surface/Kconfig
++++ b/drivers/platform/surface/Kconfig
+@@ -149,6 +149,13 @@ config SURFACE_AGGREGATOR_TABLET_SWITCH
+ 	  Select M or Y here, if you want to provide tablet-mode switch input
+ 	  events on the Surface Pro 8, Surface Pro X, and Surface Laptop Studio.
+ 
++config SURFACE_BOOK1_DGPU_SWITCH
++	tristate "Surface Book 1 dGPU Switch Driver"
++	depends on SYSFS
++	help
++	  This driver provides a sysfs switch to set the power-state of the
++	  discrete GPU found on the Microsoft Surface Book 1.
++
+ config SURFACE_DTX
+ 	tristate "Surface DTX (Detachment System) Driver"
+ 	depends on SURFACE_AGGREGATOR
+diff --git a/drivers/platform/surface/Makefile b/drivers/platform/surface/Makefile
+index 53344330939b..7efcd0cdb532 100644
+--- a/drivers/platform/surface/Makefile
++++ b/drivers/platform/surface/Makefile
+@@ -12,6 +12,7 @@ obj-$(CONFIG_SURFACE_AGGREGATOR_CDEV)	+= surface_aggregator_cdev.o
+ obj-$(CONFIG_SURFACE_AGGREGATOR_HUB)	+= surface_aggregator_hub.o
+ obj-$(CONFIG_SURFACE_AGGREGATOR_REGISTRY) += surface_aggregator_registry.o
+ obj-$(CONFIG_SURFACE_AGGREGATOR_TABLET_SWITCH) += surface_aggregator_tabletsw.o
++obj-$(CONFIG_SURFACE_BOOK1_DGPU_SWITCH) += surfacebook1_dgpu_switch.o
+ obj-$(CONFIG_SURFACE_DTX)		+= surface_dtx.o
+ obj-$(CONFIG_SURFACE_GPE)		+= surface_gpe.o
+ obj-$(CONFIG_SURFACE_HOTPLUG)		+= surface_hotplug.o
+diff --git a/drivers/platform/surface/surfacebook1_dgpu_switch.c b/drivers/platform/surface/surfacebook1_dgpu_switch.c
+new file mode 100644
+index 000000000000..8b816ed8f35c
+--- /dev/null
++++ b/drivers/platform/surface/surfacebook1_dgpu_switch.c
+@@ -0,0 +1,162 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/acpi.h>
++#include <linux/platform_device.h>
++
++
++#ifdef pr_fmt
++#undef pr_fmt
++#endif
++#define pr_fmt(fmt) "%s:%s: " fmt, KBUILD_MODNAME, __func__
++
++
++static const guid_t dgpu_sw_guid = GUID_INIT(0x6fd05c69, 0xcde3, 0x49f4,
++	0x95, 0xed, 0xab, 0x16, 0x65, 0x49, 0x80, 0x35);
++
++#define DGPUSW_ACPI_PATH_DSM	"\\_SB_.PCI0.LPCB.EC0_.VGBI"
++#define DGPUSW_ACPI_PATH_HGON	"\\_SB_.PCI0.RP05.HGON"
++#define DGPUSW_ACPI_PATH_HGOF	"\\_SB_.PCI0.RP05.HGOF"
++
++
++static int sb1_dgpu_sw_dsmcall(void)
++{
++	union acpi_object *ret;
++	acpi_handle handle;
++	acpi_status status;
++
++	status = acpi_get_handle(NULL, DGPUSW_ACPI_PATH_DSM, &handle);
++	if (status)
++		return -EINVAL;
++
++	ret = acpi_evaluate_dsm_typed(handle, &dgpu_sw_guid, 1, 1, NULL, ACPI_TYPE_BUFFER);
++	if (!ret)
++		return -EINVAL;
++
++	ACPI_FREE(ret);
++	return 0;
++}
++
++static int sb1_dgpu_sw_hgon(void)
++{
++	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
++	acpi_status status;
++
++	status = acpi_evaluate_object(NULL, DGPUSW_ACPI_PATH_HGON, NULL, &buf);
++	if (status) {
++		pr_err("failed to run HGON: %d\n", status);
++		return -EINVAL;
++	}
++
++	if (buf.pointer)
++		ACPI_FREE(buf.pointer);
++
++	pr_info("turned-on dGPU via HGON\n");
++	return 0;
++}
++
++static int sb1_dgpu_sw_hgof(void)
++{
++	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
++	acpi_status status;
++
++	status = acpi_evaluate_object(NULL, DGPUSW_ACPI_PATH_HGOF, NULL, &buf);
++	if (status) {
++		pr_err("failed to run HGOF: %d\n", status);
++		return -EINVAL;
++	}
++
++	if (buf.pointer)
++		ACPI_FREE(buf.pointer);
++
++	pr_info("turned-off dGPU via HGOF\n");
++	return 0;
++}
++
++
++static ssize_t dgpu_dsmcall_store(struct device *dev, struct device_attribute *attr,
++				  const char *buf, size_t len)
++{
++	int status, value;
++
++	status = kstrtoint(buf, 0, &value);
++	if (status < 0)
++		return status;
++
++	if (value != 1)
++		return -EINVAL;
++
++	status = sb1_dgpu_sw_dsmcall();
++
++	return status < 0 ? status : len;
++}
++
++static ssize_t dgpu_power_store(struct device *dev, struct device_attribute *attr,
++				const char *buf, size_t len)
++{
++	bool power;
++	int status;
++
++	status = kstrtobool(buf, &power);
++	if (status < 0)
++		return status;
++
++	if (power)
++		status = sb1_dgpu_sw_hgon();
++	else
++		status = sb1_dgpu_sw_hgof();
++
++	return status < 0 ? status : len;
++}
++
++static DEVICE_ATTR_WO(dgpu_dsmcall);
++static DEVICE_ATTR_WO(dgpu_power);
++
++static struct attribute *sb1_dgpu_sw_attrs[] = {
++	&dev_attr_dgpu_dsmcall.attr,
++	&dev_attr_dgpu_power.attr,
++	NULL,
++};
++
++static const struct attribute_group sb1_dgpu_sw_attr_group = {
++	.attrs = sb1_dgpu_sw_attrs,
++};
++
++
++static int sb1_dgpu_sw_probe(struct platform_device *pdev)
++{
++	return sysfs_create_group(&pdev->dev.kobj, &sb1_dgpu_sw_attr_group);
++}
++
++static int sb1_dgpu_sw_remove(struct platform_device *pdev)
++{
++	sysfs_remove_group(&pdev->dev.kobj, &sb1_dgpu_sw_attr_group);
++	return 0;
++}
++
++/*
++ * The dGPU power seems to be actually handled by MSHW0040. However, that is
++ * also the power-/volume-button device with a mainline driver. So let's use
++ * MSHW0041 instead for now, which seems to be the LTCH (latch/DTX) device.
++ */
++static const struct acpi_device_id sb1_dgpu_sw_match[] = {
++	{ "MSHW0041", },
++	{ },
++};
++MODULE_DEVICE_TABLE(acpi, sb1_dgpu_sw_match);
++
++static struct platform_driver sb1_dgpu_sw = {
++	.probe = sb1_dgpu_sw_probe,
++	.remove = sb1_dgpu_sw_remove,
++	.driver = {
++		.name = "surfacebook1_dgpu_switch",
++		.acpi_match_table = sb1_dgpu_sw_match,
++		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
++	},
++};
++module_platform_driver(sb1_dgpu_sw);
++
++MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
++MODULE_DESCRIPTION("Discrete GPU Power-Switch for Surface Book 1");
++MODULE_LICENSE("GPL");
+-- 
+2.41.0
+

patches/6.4/0007-surface-button.patch

@@ -0,0 +1,149 @@
+From f5394af6a951c9b197de66203f4ec998b321f2f1 Mon Sep 17 00:00:00 2001
+From: Sachi King <nakato@nakato.io>
+Date: Tue, 5 Oct 2021 00:05:09 +1100
+Subject: [PATCH] Input: soc_button_array - support AMD variant Surface devices
+
+The power button on the AMD variant of the Surface Laptop uses the
+same MSHW0040 device ID as the 5th and later generation of Surface
+devices, however they report 0 for their OEM platform revision.  As the
+_DSM does not exist on the devices requiring special casing, check for
+the existance of the _DSM to determine if soc_button_array should be
+loaded.
+
+Fixes: c394159310d0 ("Input: soc_button_array - add support for newer surface devices")
+Co-developed-by: Maximilian Luz <luzmaximilian@gmail.com>
+
+Signed-off-by: Sachi King <nakato@nakato.io>
+Patchset: surface-button
+---
+ drivers/input/misc/soc_button_array.c | 33 +++++++--------------------
+ 1 file changed, 8 insertions(+), 25 deletions(-)
+
+diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
+index e79f5497948b..2bddbe6e9ea4 100644
+--- a/drivers/input/misc/soc_button_array.c
++++ b/drivers/input/misc/soc_button_array.c
+@@ -537,8 +537,8 @@ static const struct soc_device_data soc_device_MSHW0028 = {
+  * Both, the Surface Pro 4 (surfacepro3_button.c) and the above mentioned
+  * devices use MSHW0040 for power and volume buttons, however the way they
+  * have to be addressed differs. Make sure that we only load this drivers
+- * for the correct devices by checking the OEM Platform Revision provided by
+- * the _DSM method.
++ * for the correct devices by checking if the OEM Platform Revision DSM call
++ * exists.
+  */
+ #define MSHW0040_DSM_REVISION		0x01
+ #define MSHW0040_DSM_GET_OMPR		0x02	// get OEM Platform Revision
+@@ -549,31 +549,14 @@ static const guid_t MSHW0040_DSM_UUID =
+ static int soc_device_check_MSHW0040(struct device *dev)
+ {
+ 	acpi_handle handle = ACPI_HANDLE(dev);
+-	union acpi_object *result;
+-	u64 oem_platform_rev = 0;	// valid revisions are nonzero
+-
+-	// get OEM platform revision
+-	result = acpi_evaluate_dsm_typed(handle, &MSHW0040_DSM_UUID,
+-					 MSHW0040_DSM_REVISION,
+-					 MSHW0040_DSM_GET_OMPR, NULL,
+-					 ACPI_TYPE_INTEGER);
+-
+-	if (result) {
+-		oem_platform_rev = result->integer.value;
+-		ACPI_FREE(result);
+-	}
+-
+-	/*
+-	 * If the revision is zero here, the _DSM evaluation has failed. This
+-	 * indicates that we have a Pro 4 or Book 1 and this driver should not
+-	 * be used.
+-	 */
+-	if (oem_platform_rev == 0)
+-		return -ENODEV;
++	bool exists;
+ 
+-	dev_dbg(dev, "OEM Platform Revision %llu\n", oem_platform_rev);
++	// check if OEM platform revision DSM call exists
++	exists = acpi_check_dsm(handle, &MSHW0040_DSM_UUID,
++				MSHW0040_DSM_REVISION,
++				BIT(MSHW0040_DSM_GET_OMPR));
+ 
+-	return 0;
++	return exists ? 0 : -ENODEV;
+ }
+ 
+ /*
+-- 
+2.41.0
+
+From c17de3502b2666b6d2f33b90a9753dc682870622 Mon Sep 17 00:00:00 2001
+From: Sachi King <nakato@nakato.io>
+Date: Tue, 5 Oct 2021 00:22:57 +1100
+Subject: [PATCH] platform/surface: surfacepro3_button: don't load on amd
+ variant
+
+The AMD variant of the Surface Laptop report 0 for their OEM platform
+revision.  The Surface devices that require the surfacepro3_button
+driver do not have the _DSM that gets the OEM platform revision.  If the
+method does not exist, load surfacepro3_button.
+
+Fixes: 64dd243d7356 ("platform/x86: surfacepro3_button: Fix device check")
+Co-developed-by: Maximilian Luz <luzmaximilian@gmail.com>
+
+Signed-off-by: Sachi King <nakato@nakato.io>
+Patchset: surface-button
+---
+ drivers/platform/surface/surfacepro3_button.c | 30 ++++---------------
+ 1 file changed, 6 insertions(+), 24 deletions(-)
+
+diff --git a/drivers/platform/surface/surfacepro3_button.c b/drivers/platform/surface/surfacepro3_button.c
+index 2755601f979c..4240c98ca226 100644
+--- a/drivers/platform/surface/surfacepro3_button.c
++++ b/drivers/platform/surface/surfacepro3_button.c
+@@ -149,7 +149,8 @@ static int surface_button_resume(struct device *dev)
+ /*
+  * Surface Pro 4 and Surface Book 2 / Surface Pro 2017 use the same device
+  * ID (MSHW0040) for the power/volume buttons. Make sure this is the right
+- * device by checking for the _DSM method and OEM Platform Revision.
++ * device by checking for the _DSM method and OEM Platform Revision DSM
++ * function.
+  *
+  * Returns true if the driver should bind to this device, i.e. the device is
+  * either MSWH0028 (Pro 3) or MSHW0040 on a Pro 4 or Book 1.
+@@ -157,30 +158,11 @@ static int surface_button_resume(struct device *dev)
+ static bool surface_button_check_MSHW0040(struct acpi_device *dev)
+ {
+ 	acpi_handle handle = dev->handle;
+-	union acpi_object *result;
+-	u64 oem_platform_rev = 0;	// valid revisions are nonzero
+-
+-	// get OEM platform revision
+-	result = acpi_evaluate_dsm_typed(handle, &MSHW0040_DSM_UUID,
+-					 MSHW0040_DSM_REVISION,
+-					 MSHW0040_DSM_GET_OMPR,
+-					 NULL, ACPI_TYPE_INTEGER);
+-
+-	/*
+-	 * If evaluating the _DSM fails, the method is not present. This means
+-	 * that we have either MSHW0028 or MSHW0040 on Pro 4 or Book 1, so we
+-	 * should use this driver. We use revision 0 indicating it is
+-	 * unavailable.
+-	 */
+-
+-	if (result) {
+-		oem_platform_rev = result->integer.value;
+-		ACPI_FREE(result);
+-	}
+-
+-	dev_dbg(&dev->dev, "OEM Platform Revision %llu\n", oem_platform_rev);
+ 
+-	return oem_platform_rev == 0;
++	// make sure that OEM platform revision DSM call does not exist
++	return !acpi_check_dsm(handle, &MSHW0040_DSM_UUID,
++			       MSHW0040_DSM_REVISION,
++			       BIT(MSHW0040_DSM_GET_OMPR));
+ }
+ 
+ 
+-- 
+2.41.0
+

patches/6.4/0008-surface-typecover.patch

@@ -0,0 +1,574 @@
+From e1cf975d2d22bdf039dc9c6f108f0239f1da86fe Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Sat, 18 Feb 2023 01:02:49 +0100
+Subject: [PATCH] USB: quirks: Add USB_QUIRK_DELAY_INIT for Surface Go 3
+ Type-Cover
+
+The touchpad on the Type-Cover of the Surface Go 3 is sometimes not
+being initialized properly. Apply USB_QUIRK_DELAY_INIT to fix this
+issue.
+
+More specifically, the device in question is a fairly standard modern
+touchpad with pointer and touchpad input modes. During setup, the device
+needs to be switched from pointer- to touchpad-mode (which is done in
+hid-multitouch) to fully utilize it as intended. Unfortunately, however,
+this seems to occasionally fail silently, leaving the device in
+pointer-mode. Applying USB_QUIRK_DELAY_INIT seems to fix this.
+
+Link: https://github.com/linux-surface/linux-surface/issues/1059
+Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
+Patchset: surface-typecover
+---
+ drivers/usb/core/quirks.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
+index 934b3d997702..2c6604c6e8e1 100644
+--- a/drivers/usb/core/quirks.c
++++ b/drivers/usb/core/quirks.c
+@@ -220,6 +220,9 @@ static const struct usb_device_id usb_quirk_list[] = {
+ 	/* Microsoft Surface Dock Ethernet (RTL8153 GigE) */
+ 	{ USB_DEVICE(0x045e, 0x07c6), .driver_info = USB_QUIRK_NO_LPM },
+ 
++	/* Microsoft Surface Go 3 Type-Cover */
++	{ USB_DEVICE(0x045e, 0x09b5), .driver_info = USB_QUIRK_DELAY_INIT },
++
+ 	/* Cherry Stream G230 2.0 (G85-231) and 3.0 (G85-232) */
+ 	{ USB_DEVICE(0x046a, 0x0023), .driver_info = USB_QUIRK_RESET_RESUME },
+ 
+-- 
+2.41.0
+
+From aafc63f7a71c5fa41f3607d5ab86bfa6e247798c Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jonas=20Dre=C3=9Fler?= <verdre@v0yd.nl>
+Date: Thu, 5 Nov 2020 13:09:45 +0100
+Subject: [PATCH] hid/multitouch: Turn off Type Cover keyboard backlight when
+ suspending
+
+The Type Cover for Microsoft Surface devices supports a special usb
+control request to disable or enable the built-in keyboard backlight.
+On Windows, this request happens when putting the device into suspend or
+resuming it, without it the backlight of the Type Cover will remain
+enabled for some time even though the computer is suspended, which looks
+weird to the user.
+
+So add support for this special usb control request to hid-multitouch,
+which is the driver that's handling the Type Cover.
+
+The reason we have to use a pm_notifier for this instead of the usual
+suspend/resume methods is that those won't get called in case the usb
+device is already autosuspended.
+
+Also, if the device is autosuspended, we have to briefly autoresume it
+in order to send the request. Doing that should be fine, the usb-core
+driver does something similar during suspend inside choose_wakeup().
+
+To make sure we don't send that request to every device but only to
+devices which support it, add a new quirk
+MT_CLS_WIN_8_MS_SURFACE_TYPE_COVER to hid-multitouch. For now this quirk
+is only enabled for the usb id of the Surface Pro 2017 Type Cover, which
+is where I confirmed that it's working.
+
+Patchset: surface-typecover
+---
+ drivers/hid/hid-multitouch.c | 100 ++++++++++++++++++++++++++++++++++-
+ 1 file changed, 98 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
+index e31be0cb8b85..63fd042aba6b 100644
+--- a/drivers/hid/hid-multitouch.c
++++ b/drivers/hid/hid-multitouch.c
+@@ -34,7 +34,10 @@
+ #include <linux/device.h>
+ #include <linux/hid.h>
+ #include <linux/module.h>
++#include <linux/pm_runtime.h>
+ #include <linux/slab.h>
++#include <linux/suspend.h>
++#include <linux/usb.h>
+ #include <linux/input/mt.h>
+ #include <linux/jiffies.h>
+ #include <linux/string.h>
+@@ -47,6 +50,7 @@ MODULE_DESCRIPTION("HID multitouch panels");
+ MODULE_LICENSE("GPL");
+ 
+ #include "hid-ids.h"
++#include "usbhid/usbhid.h"
+ 
+ /* quirks to control the device */
+ #define MT_QUIRK_NOT_SEEN_MEANS_UP	BIT(0)
+@@ -72,12 +76,15 @@ MODULE_LICENSE("GPL");
+ #define MT_QUIRK_FORCE_MULTI_INPUT	BIT(20)
+ #define MT_QUIRK_DISABLE_WAKEUP		BIT(21)
+ #define MT_QUIRK_ORIENTATION_INVERT	BIT(22)
++#define MT_QUIRK_HAS_TYPE_COVER_BACKLIGHT	BIT(23)
+ 
+ #define MT_INPUTMODE_TOUCHSCREEN	0x02
+ #define MT_INPUTMODE_TOUCHPAD		0x03
+ 
+ #define MT_BUTTONTYPE_CLICKPAD		0
+ 
++#define MS_TYPE_COVER_FEATURE_REPORT_USAGE	0xff050086
++
+ enum latency_mode {
+ 	HID_LATENCY_NORMAL = 0,
+ 	HID_LATENCY_HIGH = 1,
+@@ -169,6 +176,8 @@ struct mt_device {
+ 
+ 	struct list_head applications;
+ 	struct list_head reports;
++
++	struct notifier_block pm_notifier;
+ };
+ 
+ static void mt_post_parse_default_settings(struct mt_device *td,
+@@ -213,6 +222,7 @@ static void mt_post_parse(struct mt_device *td, struct mt_application *app);
+ #define MT_CLS_GOOGLE				0x0111
+ #define MT_CLS_RAZER_BLADE_STEALTH		0x0112
+ #define MT_CLS_SMART_TECH			0x0113
++#define MT_CLS_WIN_8_MS_SURFACE_TYPE_COVER	0x0114
+ 
+ #define MT_DEFAULT_MAXCONTACT	10
+ #define MT_MAX_MAXCONTACT	250
+@@ -397,6 +407,16 @@ static const struct mt_class mt_classes[] = {
+ 			MT_QUIRK_CONTACT_CNT_ACCURATE |
+ 			MT_QUIRK_SEPARATE_APP_REPORT,
+ 	},
++	{ .name = MT_CLS_WIN_8_MS_SURFACE_TYPE_COVER,
++		.quirks = MT_QUIRK_HAS_TYPE_COVER_BACKLIGHT |
++			MT_QUIRK_ALWAYS_VALID |
++			MT_QUIRK_IGNORE_DUPLICATES |
++			MT_QUIRK_HOVERING |
++			MT_QUIRK_CONTACT_CNT_ACCURATE |
++			MT_QUIRK_STICKY_FINGERS |
++			MT_QUIRK_WIN8_PTP_BUTTONS,
++		.export_all_inputs = true
++	},
+ 	{ }
+ };
+ 
+@@ -1728,6 +1748,69 @@ static void mt_expired_timeout(struct timer_list *t)
+ 	clear_bit_unlock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
+ }
+ 
++static void get_type_cover_backlight_field(struct hid_device *hdev,
++					   struct hid_field **field)
++{
++	struct hid_report_enum *rep_enum;
++	struct hid_report *rep;
++	struct hid_field *cur_field;
++	int i, j;
++
++	rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
++	list_for_each_entry(rep, &rep_enum->report_list, list) {
++		for (i = 0; i < rep->maxfield; i++) {
++			cur_field = rep->field[i];
++
++			for (j = 0; j < cur_field->maxusage; j++) {
++				if (cur_field->usage[j].hid
++				    == MS_TYPE_COVER_FEATURE_REPORT_USAGE) {
++					*field = cur_field;
++					return;
++				}
++			}
++		}
++	}
++}
++
++static void update_keyboard_backlight(struct hid_device *hdev, bool enabled)
++{
++	struct usb_device *udev = hid_to_usb_dev(hdev);
++	struct hid_field *field = NULL;
++
++	/* Wake up the device in case it's already suspended */
++	pm_runtime_get_sync(&udev->dev);
++
++	get_type_cover_backlight_field(hdev, &field);
++	if (!field) {
++		hid_err(hdev, "couldn't find backlight field\n");
++		goto out;
++	}
++
++	field->value[field->index] = enabled ? 0x01ff00ff : 0x00ff00ff;
++	hid_hw_request(hdev, field->report, HID_REQ_SET_REPORT);
++
++out:
++	pm_runtime_put_sync(&udev->dev);
++}
++
++static int mt_pm_notifier(struct notifier_block *notifier,
++			  unsigned long pm_event,
++			  void *unused)
++{
++	struct mt_device *td =
++		container_of(notifier, struct mt_device, pm_notifier);
++	struct hid_device *hdev = td->hdev;
++
++	if (td->mtclass.quirks & MT_QUIRK_HAS_TYPE_COVER_BACKLIGHT) {
++		if (pm_event == PM_SUSPEND_PREPARE)
++			update_keyboard_backlight(hdev, 0);
++		else if (pm_event == PM_POST_SUSPEND)
++			update_keyboard_backlight(hdev, 1);
++	}
++
++	return NOTIFY_DONE;
++}
++
+ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
+ {
+ 	int ret, i;
+@@ -1751,6 +1834,9 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
+ 	td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
+ 	hid_set_drvdata(hdev, td);
+ 
++	td->pm_notifier.notifier_call = mt_pm_notifier;
++	register_pm_notifier(&td->pm_notifier);
++
+ 	INIT_LIST_HEAD(&td->applications);
+ 	INIT_LIST_HEAD(&td->reports);
+ 
+@@ -1789,15 +1875,19 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
+ 	timer_setup(&td->release_timer, mt_expired_timeout, 0);
+ 
+ 	ret = hid_parse(hdev);
+-	if (ret != 0)
++	if (ret != 0) {
++		unregister_pm_notifier(&td->pm_notifier);
+ 		return ret;
++	}
+ 
+ 	if (mtclass->quirks & MT_QUIRK_FIX_CONST_CONTACT_ID)
+ 		mt_fix_const_fields(hdev, HID_DG_CONTACTID);
+ 
+ 	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+-	if (ret)
++	if (ret) {
++		unregister_pm_notifier(&td->pm_notifier);
+ 		return ret;
++	}
+ 
+ 	ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
+ 	if (ret)
+@@ -1849,6 +1939,7 @@ static void mt_remove(struct hid_device *hdev)
+ {
+ 	struct mt_device *td = hid_get_drvdata(hdev);
+ 
++	unregister_pm_notifier(&td->pm_notifier);
+ 	del_timer_sync(&td->release_timer);
+ 
+ 	sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
+@@ -2226,6 +2317,11 @@ static const struct hid_device_id mt_devices[] = {
+ 		MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
+ 			USB_DEVICE_ID_XIROKU_CSR2) },
+ 
++	/* Microsoft Surface type cover */
++	{ .driver_data = MT_CLS_WIN_8_MS_SURFACE_TYPE_COVER,
++		HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
++			USB_VENDOR_ID_MICROSOFT, 0x09c0) },
++
+ 	/* Google MT devices */
+ 	{ .driver_data = MT_CLS_GOOGLE,
+ 		HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, USB_VENDOR_ID_GOOGLE,
+-- 
+2.41.0
+
+From bcf712f57f658a615c4e0fe7e84110c9d3fa1f91 Mon Sep 17 00:00:00 2001
+From: PJungkamp <p.jungkamp@gmail.com>
+Date: Fri, 25 Feb 2022 12:04:25 +0100
+Subject: [PATCH] hid/multitouch: Add support for surface pro type cover tablet
+ switch
+
+The Surface Pro Type Cover has several non standard HID usages in it's
+hid report descriptor.
+I noticed that, upon folding the typecover back, a vendor specific range
+of 4 32 bit integer hid usages is transmitted.
+Only the first byte of the message seems to convey reliable information
+about the keyboard state.
+
+0x22 => Normal (keys enabled)
+0x33 => Folded back (keys disabled)
+0x53 => Rotated left/right side up (keys disabled)
+0x13 => Cover closed (keys disabled)
+0x43 => Folded back and Tablet upside down (keys disabled)
+This list may not be exhaustive.
+
+The tablet mode switch will be disabled for a value of 0x22 and enabled
+on any other value.
+
+Patchset: surface-typecover
+---
+ drivers/hid/hid-multitouch.c | 148 +++++++++++++++++++++++++++++------
+ 1 file changed, 122 insertions(+), 26 deletions(-)
+
+diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
+index 63fd042aba6b..508a250ff4bf 100644
+--- a/drivers/hid/hid-multitouch.c
++++ b/drivers/hid/hid-multitouch.c
+@@ -77,6 +77,7 @@ MODULE_LICENSE("GPL");
+ #define MT_QUIRK_DISABLE_WAKEUP		BIT(21)
+ #define MT_QUIRK_ORIENTATION_INVERT	BIT(22)
+ #define MT_QUIRK_HAS_TYPE_COVER_BACKLIGHT	BIT(23)
++#define MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH	BIT(24)
+ 
+ #define MT_INPUTMODE_TOUCHSCREEN	0x02
+ #define MT_INPUTMODE_TOUCHPAD		0x03
+@@ -84,6 +85,8 @@ MODULE_LICENSE("GPL");
+ #define MT_BUTTONTYPE_CLICKPAD		0
+ 
+ #define MS_TYPE_COVER_FEATURE_REPORT_USAGE	0xff050086
++#define MS_TYPE_COVER_TABLET_MODE_SWITCH_USAGE	0xff050072
++#define MS_TYPE_COVER_APPLICATION	0xff050050
+ 
+ enum latency_mode {
+ 	HID_LATENCY_NORMAL = 0,
+@@ -409,6 +412,7 @@ static const struct mt_class mt_classes[] = {
+ 	},
+ 	{ .name = MT_CLS_WIN_8_MS_SURFACE_TYPE_COVER,
+ 		.quirks = MT_QUIRK_HAS_TYPE_COVER_BACKLIGHT |
++			MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH |
+ 			MT_QUIRK_ALWAYS_VALID |
+ 			MT_QUIRK_IGNORE_DUPLICATES |
+ 			MT_QUIRK_HOVERING |
+@@ -1390,6 +1394,9 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ 	    field->application != HID_CP_CONSUMER_CONTROL &&
+ 	    field->application != HID_GD_WIRELESS_RADIO_CTLS &&
+ 	    field->application != HID_GD_SYSTEM_MULTIAXIS &&
++	    !(field->application == MS_TYPE_COVER_APPLICATION &&
++	      application->quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH &&
++	      usage->hid == MS_TYPE_COVER_TABLET_MODE_SWITCH_USAGE) &&
+ 	    !(field->application == HID_VD_ASUS_CUSTOM_MEDIA_KEYS &&
+ 	      application->quirks & MT_QUIRK_ASUS_CUSTOM_UP))
+ 		return -1;
+@@ -1417,6 +1424,21 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ 		return 1;
+ 	}
+ 
++	/*
++	 * The Microsoft Surface Pro Typecover has a non-standard HID
++	 * tablet mode switch on a vendor specific usage page with vendor
++	 * specific usage.
++	 */
++	if (field->application == MS_TYPE_COVER_APPLICATION &&
++	    application->quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH &&
++	    usage->hid == MS_TYPE_COVER_TABLET_MODE_SWITCH_USAGE) {
++		usage->type = EV_SW;
++		usage->code = SW_TABLET_MODE;
++		*max = SW_MAX;
++		*bit = hi->input->swbit;
++		return 1;
++	}
++
+ 	if (rdata->is_mt_collection)
+ 		return mt_touch_input_mapping(hdev, hi, field, usage, bit, max,
+ 					      application);
+@@ -1438,6 +1460,7 @@ static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+ {
+ 	struct mt_device *td = hid_get_drvdata(hdev);
+ 	struct mt_report_data *rdata;
++	struct input_dev *input;
+ 
+ 	rdata = mt_find_report_data(td, field->report);
+ 	if (rdata && rdata->is_mt_collection) {
+@@ -1445,6 +1468,19 @@ static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+ 		return -1;
+ 	}
+ 
++	/*
++	 * We own an input device which acts as a tablet mode switch for
++	 * the Surface Pro Typecover.
++	 */
++	if (field->application == MS_TYPE_COVER_APPLICATION &&
++	    rdata->application->quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH &&
++	    usage->hid == MS_TYPE_COVER_TABLET_MODE_SWITCH_USAGE) {
++		input = hi->input;
++		input_set_capability(input, EV_SW, SW_TABLET_MODE);
++		input_report_switch(input, SW_TABLET_MODE, 0);
++		return -1;
++	}
++
+ 	/* let hid-core decide for the others */
+ 	return 0;
+ }
+@@ -1454,11 +1490,21 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
+ {
+ 	struct mt_device *td = hid_get_drvdata(hid);
+ 	struct mt_report_data *rdata;
++	struct input_dev *input;
+ 
+ 	rdata = mt_find_report_data(td, field->report);
+ 	if (rdata && rdata->is_mt_collection)
+ 		return mt_touch_event(hid, field, usage, value);
+ 
++	if (field->application == MS_TYPE_COVER_APPLICATION &&
++	    rdata->application->quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH &&
++	    usage->hid == MS_TYPE_COVER_TABLET_MODE_SWITCH_USAGE) {
++		input = field->hidinput->input;
++		input_report_switch(input, SW_TABLET_MODE, (value & 0xFF) != 0x22);
++		input_sync(input);
++		return 1;
++	}
++
+ 	return 0;
+ }
+ 
+@@ -1611,6 +1657,42 @@ static void mt_post_parse(struct mt_device *td, struct mt_application *app)
+ 		app->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
+ }
+ 
++static int get_type_cover_field(struct hid_report_enum *rep_enum,
++				struct hid_field **field, int usage)
++{
++	struct hid_report *rep;
++	struct hid_field *cur_field;
++	int i, j;
++
++	list_for_each_entry(rep, &rep_enum->report_list, list) {
++		for (i = 0; i < rep->maxfield; i++) {
++			cur_field = rep->field[i];
++			if (cur_field->application != MS_TYPE_COVER_APPLICATION)
++				continue;
++			for (j = 0; j < cur_field->maxusage; j++) {
++				if (cur_field->usage[j].hid == usage) {
++					*field = cur_field;
++					return true;
++				}
++			}
++		}
++	}
++	return false;
++}
++
++static void request_type_cover_tablet_mode_switch(struct hid_device *hdev)
++{
++	struct hid_field *field;
++
++	if (get_type_cover_field(&hdev->report_enum[HID_INPUT_REPORT],
++				 &field,
++				 MS_TYPE_COVER_TABLET_MODE_SWITCH_USAGE)) {
++		hid_hw_request(hdev, field->report, HID_REQ_GET_REPORT);
++	} else {
++		hid_err(hdev, "couldn't find tablet mode field\n");
++	}
++}
++
+ static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
+ {
+ 	struct mt_device *td = hid_get_drvdata(hdev);
+@@ -1660,6 +1742,13 @@ static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
+ 		/* force BTN_STYLUS to allow tablet matching in udev */
+ 		__set_bit(BTN_STYLUS, hi->input->keybit);
+ 		break;
++	case MS_TYPE_COVER_APPLICATION:
++		if (td->mtclass.quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH) {
++			suffix = "Tablet Mode Switch";
++			request_type_cover_tablet_mode_switch(hdev);
++			break;
++		}
++		fallthrough;
+ 	default:
+ 		suffix = "UNKNOWN";
+ 		break;
+@@ -1748,30 +1837,6 @@ static void mt_expired_timeout(struct timer_list *t)
+ 	clear_bit_unlock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
+ }
+ 
+-static void get_type_cover_backlight_field(struct hid_device *hdev,
+-					   struct hid_field **field)
+-{
+-	struct hid_report_enum *rep_enum;
+-	struct hid_report *rep;
+-	struct hid_field *cur_field;
+-	int i, j;
+-
+-	rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
+-	list_for_each_entry(rep, &rep_enum->report_list, list) {
+-		for (i = 0; i < rep->maxfield; i++) {
+-			cur_field = rep->field[i];
+-
+-			for (j = 0; j < cur_field->maxusage; j++) {
+-				if (cur_field->usage[j].hid
+-				    == MS_TYPE_COVER_FEATURE_REPORT_USAGE) {
+-					*field = cur_field;
+-					return;
+-				}
+-			}
+-		}
+-	}
+-}
+-
+ static void update_keyboard_backlight(struct hid_device *hdev, bool enabled)
+ {
+ 	struct usb_device *udev = hid_to_usb_dev(hdev);
+@@ -1780,8 +1845,9 @@ static void update_keyboard_backlight(struct hid_device *hdev, bool enabled)
+ 	/* Wake up the device in case it's already suspended */
+ 	pm_runtime_get_sync(&udev->dev);
+ 
+-	get_type_cover_backlight_field(hdev, &field);
+-	if (!field) {
++	if (!get_type_cover_field(&hdev->report_enum[HID_FEATURE_REPORT],
++				  &field,
++				  MS_TYPE_COVER_FEATURE_REPORT_USAGE)) {
+ 		hid_err(hdev, "couldn't find backlight field\n");
+ 		goto out;
+ 	}
+@@ -1916,13 +1982,24 @@ static int mt_suspend(struct hid_device *hdev, pm_message_t state)
+ 
+ static int mt_reset_resume(struct hid_device *hdev)
+ {
++	struct mt_device *td = hid_get_drvdata(hdev);
++
+ 	mt_release_contacts(hdev);
+ 	mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
++
++	/* Request an update on the typecover folding state on resume
++	 * after reset.
++	 */
++	if (td->mtclass.quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH)
++		request_type_cover_tablet_mode_switch(hdev);
++
+ 	return 0;
+ }
+ 
+ static int mt_resume(struct hid_device *hdev)
+ {
++	struct mt_device *td = hid_get_drvdata(hdev);
++
+ 	/* Some Elan legacy devices require SET_IDLE to be set on resume.
+ 	 * It should be safe to send it to other devices too.
+ 	 * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
+@@ -1931,6 +2008,10 @@ static int mt_resume(struct hid_device *hdev)
+ 
+ 	mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
+ 
++	/* Request an update on the typecover folding state on resume. */
++	if (td->mtclass.quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH)
++		request_type_cover_tablet_mode_switch(hdev);
++
+ 	return 0;
+ }
+ #endif
+@@ -1938,6 +2019,21 @@ static int mt_resume(struct hid_device *hdev)
+ static void mt_remove(struct hid_device *hdev)
+ {
+ 	struct mt_device *td = hid_get_drvdata(hdev);
++	struct hid_field *field;
++	struct input_dev *input;
++
++	/* Reset tablet mode switch on disconnect. */
++	if (td->mtclass.quirks & MT_QUIRK_HAS_TYPE_COVER_TABLET_MODE_SWITCH) {
++		if (get_type_cover_field(&hdev->report_enum[HID_INPUT_REPORT],
++					 &field,
++					 MS_TYPE_COVER_TABLET_MODE_SWITCH_USAGE)) {
++			input = field->hidinput->input;
++			input_report_switch(input, SW_TABLET_MODE, 0);
++			input_sync(input);
++		} else {
++			hid_err(hdev, "couldn't find tablet mode field\n");
++		}
++	}
+ 
+ 	unregister_pm_notifier(&td->pm_notifier);
+ 	del_timer_sync(&td->release_timer);
+-- 
+2.41.0
+

patches/6.4/0009-surface-shutdown.patch

@@ -0,0 +1,97 @@
+From 4e87c419ba748a5074fb14ba10c129a6928b6ba9 Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Sun, 19 Feb 2023 22:12:24 +0100
+Subject: [PATCH] PCI: Add quirk to prevent calling shutdown mehtod
+
+Work around buggy EFI firmware: On some Microsoft Surface devices
+(Surface Pro 9 and Surface Laptop 5) the EFI ResetSystem call with
+EFI_RESET_SHUTDOWN doesn't function properly. Instead of shutting the
+system down, it returns and the system stays on.
+
+It turns out that this only happens after PCI shutdown callbacks ran for
+specific devices. Excluding those devices from the shutdown process
+makes the ResetSystem call work as expected.
+
+TODO: Maybe we can find a better way or the root cause of this?
+
+Not-Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
+Patchset: surface-shutdown
+---
+ drivers/pci/pci-driver.c |  3 +++
+ drivers/pci/quirks.c     | 36 ++++++++++++++++++++++++++++++++++++
+ include/linux/pci.h      |  1 +
+ 3 files changed, 40 insertions(+)
+
+diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
+index ae9baf801681..fdfaec2312a0 100644
+--- a/drivers/pci/pci-driver.c
++++ b/drivers/pci/pci-driver.c
+@@ -507,6 +507,9 @@ static void pci_device_shutdown(struct device *dev)
+ 	struct pci_dev *pci_dev = to_pci_dev(dev);
+ 	struct pci_driver *drv = pci_dev->driver;
+ 
++	if (pci_dev->no_shutdown)
++		return;
++
+ 	pm_runtime_resume(dev);
+ 
+ 	if (drv && drv->shutdown)
+diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
+index c525867760bf..b67d9181a608 100644
+--- a/drivers/pci/quirks.c
++++ b/drivers/pci/quirks.c
+@@ -6041,3 +6041,39 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2d, dpc_log_size);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2f, dpc_log_size);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a31, dpc_log_size);
+ #endif
++
++static const struct dmi_system_id no_shutdown_dmi_table[] = {
++	/*
++	 * Systems on which some devices should not be touched during shutdown.
++	 */
++	{
++		.ident = "Microsoft Surface Pro 9",
++		.matches = {
++			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
++			DMI_MATCH(DMI_PRODUCT_NAME, "Surface Pro 9"),
++		},
++	},
++	{
++		.ident = "Microsoft Surface Laptop 5",
++		.matches = {
++			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
++			DMI_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 5"),
++		},
++	},
++	{}
++};
++
++static void quirk_no_shutdown(struct pci_dev *dev)
++{
++	if (!dmi_check_system(no_shutdown_dmi_table))
++		return;
++
++	dev->no_shutdown = 1;
++	pci_info(dev, "disabling shutdown ops for [%04x:%04x]\n",
++		 dev->vendor, dev->device);
++}
++DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x461e, quirk_no_shutdown);  // Thunderbolt 4 USB Controller
++DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x461f, quirk_no_shutdown);  // Thunderbolt 4 PCI Express Root Port
++DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x462f, quirk_no_shutdown);  // Thunderbolt 4 PCI Express Root Port
++DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x466d, quirk_no_shutdown);  // Thunderbolt 4 NHI
++DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x46a8, quirk_no_shutdown);  // GPU
+diff --git a/include/linux/pci.h b/include/linux/pci.h
+index 60b8772b5bd4..cc07be9c7e37 100644
+--- a/include/linux/pci.h
++++ b/include/linux/pci.h
+@@ -464,6 +464,7 @@ struct pci_dev {
+ 	unsigned int	no_vf_scan:1;		/* Don't scan for VFs after IOV enablement */
+ 	unsigned int	no_command_memory:1;	/* No PCI_COMMAND_MEMORY */
+ 	unsigned int	rom_bar_overlap:1;	/* ROM BAR disable broken */
++	unsigned int	no_shutdown:1;		/* Do not touch device on shutdown */
+ 	pci_dev_flags_t dev_flags;
+ 	atomic_t	enable_cnt;	/* pci_enable_device has been called */
+ 
+-- 
+2.41.0
+

patches/6.4/0010-surface-gpe.patch

@@ -0,0 +1,51 @@
+From f5478c80a7634c142f58479840afc98e61f13816 Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Sun, 12 Mar 2023 01:41:57 +0100
+Subject: [PATCH] platform/surface: gpe: Add support for Surface Pro 9
+
+Add the lid GPE used by the Surface Pro 9.
+
+Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
+Patchset: surface-gpe
+---
+ drivers/platform/surface/surface_gpe.c | 17 +++++++++++++++++
+ 1 file changed, 17 insertions(+)
+
+diff --git a/drivers/platform/surface/surface_gpe.c b/drivers/platform/surface/surface_gpe.c
+index c219b840d491..69c4352e8406 100644
+--- a/drivers/platform/surface/surface_gpe.c
++++ b/drivers/platform/surface/surface_gpe.c
+@@ -41,6 +41,11 @@ static const struct property_entry lid_device_props_l4F[] = {
+ 	{},
+ };
+ 
++static const struct property_entry lid_device_props_l52[] = {
++	PROPERTY_ENTRY_U32("gpe", 0x52),
++	{},
++};
++
+ static const struct property_entry lid_device_props_l57[] = {
+ 	PROPERTY_ENTRY_U32("gpe", 0x57),
+ 	{},
+@@ -107,6 +112,18 @@ static const struct dmi_system_id dmi_lid_device_table[] = {
+ 		},
+ 		.driver_data = (void *)lid_device_props_l4B,
+ 	},
++	{
++		/*
++		 * We match for SKU here due to product name clash with the ARM
++		 * version.
++		 */
++		.ident = "Surface Pro 9",
++		.matches = {
++			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
++			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_9_2038"),
++		},
++		.driver_data = (void *)lid_device_props_l52,
++	},
+ 	{
+ 		.ident = "Surface Book 1",
+ 		.matches = {
+-- 
+2.41.0
+

patches/6.4/0011-cameras.patch

@@ -0,0 +1,1400 @@
+From cf88b8ced271de9d55f8a1c777ce083b1c0cd482 Mon Sep 17 00:00:00 2001
+From: Hans de Goede <hdegoede@redhat.com>
+Date: Sun, 10 Oct 2021 20:56:57 +0200
+Subject: [PATCH] ACPI: delay enumeration of devices with a _DEP pointing to an
+ INT3472 device
+
+The clk and regulator frameworks expect clk/regulator consumer-devices
+to have info about the consumed clks/regulators described in the device's
+fw_node.
+
+To work around cases where this info is not present in the firmware tables,
+which is often the case on x86/ACPI devices, both frameworks allow the
+provider-driver to attach info about consumers to the clks/regulators
+when registering these.
+
+This causes problems with the probe ordering wrt drivers for consumers
+of these clks/regulators. Since the lookups are only registered when the
+provider-driver binds, trying to get these clks/regulators before then
+results in a -ENOENT error for clks and a dummy regulator for regulators.
+
+One case where we hit this issue is camera sensors such as e.g. the OV8865
+sensor found on the Microsoft Surface Go. The sensor uses clks, regulators
+and GPIOs provided by a TPS68470 PMIC which is described in an INT3472
+ACPI device. There is special platform code handling this and setting
+platform_data with the necessary consumer info on the MFD cells
+instantiated for the PMIC under: drivers/platform/x86/intel/int3472.
+
+For this to work properly the ov8865 driver must not bind to the I2C-client
+for the OV8865 sensor until after the TPS68470 PMIC gpio, regulator and
+clk MFD cells have all been fully setup.
+
+The OV8865 on the Microsoft Surface Go is just one example, all X86
+devices using the Intel IPU3 camera block found on recent Intel SoCs
+have similar issues where there is an INT3472 HID ACPI-device, which
+describes the clks and regulators, and the driver for this INT3472 device
+must be fully initialized before the sensor driver (any sensor driver)
+binds for things to work properly.
+
+On these devices the ACPI nodes describing the sensors all have a _DEP
+dependency on the matching INT3472 ACPI device (there is one per sensor).
+
+This allows solving the probe-ordering problem by delaying the enumeration
+(instantiation of the I2C-client in the ov8865 example) of ACPI-devices
+which have a _DEP dependency on an INT3472 device.
+
+The new acpi_dev_ready_for_enumeration() helper used for this is also
+exported because for devices, which have the enumeration_by_parent flag
+set, the parent-driver will do its own scan of child ACPI devices and
+it will try to enumerate those during its probe(). Code doing this such
+as e.g. the i2c-core-acpi.c code must call this new helper to ensure
+that it too delays the enumeration until all the _DEP dependencies are
+met on devices which have the new honor_deps flag set.
+
+Signed-off-by: Hans de Goede <hdegoede@redhat.com>
+Patchset: cameras
+---
+ drivers/acpi/scan.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
+index 0c6f06abe3f4..4fc320f424e8 100644
+--- a/drivers/acpi/scan.c
++++ b/drivers/acpi/scan.c
+@@ -2106,6 +2106,9 @@ static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
+ 
+ static void acpi_default_enumeration(struct acpi_device *device)
+ {
++	if (!acpi_dev_ready_for_enumeration(device))
++		return;
++
+ 	/*
+ 	 * Do not enumerate devices with enumeration_by_parent flag set as
+ 	 * they will be enumerated by their respective parents.
+-- 
+2.41.0
+
+From 502d2d98a73bb12cdb210ae2567891972c4d4931 Mon Sep 17 00:00:00 2001
+From: zouxiaoh <xiaohong.zou@intel.com>
+Date: Fri, 25 Jun 2021 08:52:59 +0800
+Subject: [PATCH] iommu: intel-ipu: use IOMMU passthrough mode for Intel IPUs
+
+Intel IPU(Image Processing Unit) has its own (IO)MMU hardware,
+The IPU driver allocates its own page table that is not mapped
+via the DMA, and thus the Intel IOMMU driver blocks access giving
+this error: DMAR: DRHD: handling fault status reg 3 DMAR:
+[DMA Read] Request device [00:05.0] PASID ffffffff
+fault addr 76406000 [fault reason 06] PTE Read access is not set
+As IPU is not an external facing device which is not risky, so use
+IOMMU passthrough mode for Intel IPUs.
+
+Change-Id: I6dcccdadac308cf42e20a18e1b593381391e3e6b
+Depends-On: Iacd67578e8c6a9b9ac73285f52b4081b72fb68a6
+Tracked-On: #JIITL8-411
+Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
+Signed-off-by: zouxiaoh <xiaohong.zou@intel.com>
+Signed-off-by: Xu Chongyang <chongyang.xu@intel.com>
+Patchset: cameras
+---
+ drivers/iommu/intel/iommu.c | 30 ++++++++++++++++++++++++++++++
+ 1 file changed, 30 insertions(+)
+
+diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
+index 0d4542b7365d..c96a9baea21c 100644
+--- a/drivers/iommu/intel/iommu.c
++++ b/drivers/iommu/intel/iommu.c
+@@ -37,6 +37,12 @@
+ #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
+ #define IS_USB_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_SERIAL_USB)
+ #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
++#define IS_INTEL_IPU(pdev) ((pdev)->vendor == PCI_VENDOR_ID_INTEL &&	\
++			   ((pdev)->device == 0x9a19 ||		\
++			    (pdev)->device == 0x9a39 ||		\
++			    (pdev)->device == 0x4e19 ||		\
++			    (pdev)->device == 0x465d ||		\
++			    (pdev)->device == 0x1919))
+ #define IS_IPTS(pdev) ((pdev)->vendor == PCI_VENDOR_ID_INTEL &&	\
+ 			    ((pdev)->device == 0x9d3e))
+ #define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e)
+@@ -290,12 +296,14 @@ EXPORT_SYMBOL_GPL(intel_iommu_enabled);
+ 
+ static int dmar_map_gfx = 1;
+ static int dmar_map_ipts = 1;
++static int dmar_map_ipu = 1;
+ static int intel_iommu_superpage = 1;
+ static int iommu_identity_mapping;
+ static int iommu_skip_te_disable;
+ 
+ #define IDENTMAP_GFX		2
+ #define IDENTMAP_AZALIA		4
++#define IDENTMAP_IPU		8
+ #define IDENTMAP_IPTS		16
+ 
+ const struct iommu_ops intel_iommu_ops;
+@@ -2565,6 +2573,9 @@ static int device_def_domain_type(struct device *dev)
+ 		if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev))
+ 			return IOMMU_DOMAIN_IDENTITY;
+ 
++		if ((iommu_identity_mapping & IDENTMAP_IPU) && IS_INTEL_IPU(pdev))
++			return IOMMU_DOMAIN_IDENTITY;
++
+ 		if ((iommu_identity_mapping & IDENTMAP_IPTS) && IS_IPTS(pdev))
+ 			return IOMMU_DOMAIN_IDENTITY;
+ 	}
+@@ -2874,6 +2885,9 @@ static int __init init_dmars(void)
+ 	if (!dmar_map_gfx)
+ 		iommu_identity_mapping |= IDENTMAP_GFX;
+ 
++	if (!dmar_map_ipu)
++		iommu_identity_mapping |= IDENTMAP_IPU;
++
+ 	if (!dmar_map_ipts)
+ 		iommu_identity_mapping |= IDENTMAP_IPTS;
+ 
+@@ -4788,6 +4802,18 @@ static void quirk_iommu_igfx(struct pci_dev *dev)
+ 	dmar_map_gfx = 0;
+ }
+ 
++static void quirk_iommu_ipu(struct pci_dev *dev)
++{
++	if (!IS_INTEL_IPU(dev))
++		return;
++
++	if (risky_device(dev))
++		return;
++
++	pci_info(dev, "Passthrough IOMMU for integrated Intel IPU\n");
++	dmar_map_ipu = 0;
++}
++
+ static void quirk_iommu_ipts(struct pci_dev *dev)
+ {
+ 	if (!IS_IPTS(dev))
+@@ -4799,6 +4825,7 @@ static void quirk_iommu_ipts(struct pci_dev *dev)
+ 	pci_info(dev, "Passthrough IOMMU for IPTS\n");
+ 	dmar_map_ipts = 0;
+ }
++
+ /* G4x/GM45 integrated gfx dmar support is totally busted. */
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_igfx);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e00, quirk_iommu_igfx);
+@@ -4834,6 +4861,9 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x1632, quirk_iommu_igfx);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x163A, quirk_iommu_igfx);
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x163D, quirk_iommu_igfx);
+ 
++/* disable IPU dmar support */
++DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, quirk_iommu_ipu);
++
+ /* disable IPTS dmar support */
+ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9D3E, quirk_iommu_ipts);
+ 
+-- 
+2.41.0
+
+From 8e9074cf5e94a47cc001868207c84876ac803fea Mon Sep 17 00:00:00 2001
+From: Daniel Scally <djrscally@gmail.com>
+Date: Sun, 10 Oct 2021 20:57:02 +0200
+Subject: [PATCH] platform/x86: int3472: Enable I2c daisy chain
+
+The TPS68470 PMIC has an I2C passthrough mode through which I2C traffic
+can be forwarded to a device connected to the PMIC as though it were
+connected directly to the system bus. Enable this mode when the chip
+is initialised.
+
+Signed-off-by: Daniel Scally <djrscally@gmail.com>
+Patchset: cameras
+---
+ drivers/platform/x86/intel/int3472/tps68470.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/drivers/platform/x86/intel/int3472/tps68470.c b/drivers/platform/x86/intel/int3472/tps68470.c
+index 5b8d1a9620a5..6a0ff035cf20 100644
+--- a/drivers/platform/x86/intel/int3472/tps68470.c
++++ b/drivers/platform/x86/intel/int3472/tps68470.c
+@@ -46,6 +46,13 @@ static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
+ 		return ret;
+ 	}
+ 
++	/* Enable I2C daisy chain */
++	ret = regmap_write(regmap, TPS68470_REG_S_I2C_CTL, 0x03);
++	if (ret) {
++		dev_err(dev, "Failed to enable i2c daisy chain\n");
++		return ret;
++	}
++
+ 	dev_info(dev, "TPS68470 REVID: 0x%02x\n", version);
+ 
+ 	return 0;
+-- 
+2.41.0
+
+From 2b8b133824f99760a28758e2879c86248a221d8a Mon Sep 17 00:00:00 2001
+From: Daniel Scally <djrscally@gmail.com>
+Date: Wed, 4 May 2022 23:21:45 +0100
+Subject: [PATCH] media: ipu3-cio2: Move functionality from .complete() to
+ .bound()
+
+Creating links and registering subdev nodes during the .complete()
+callback has the unfortunate effect of preventing all cameras that
+connect to a notifier from working if any one of their drivers fails
+to probe. Moving the functionality from .complete() to .bound() allows
+those camera sensor drivers that did probe correctly to work regardless.
+
+Signed-off-by: Daniel Scally <djrscally@gmail.com>
+Patchset: cameras
+---
+ drivers/media/pci/intel/ipu3/ipu3-cio2-main.c | 65 +++++++------------
+ 1 file changed, 23 insertions(+), 42 deletions(-)
+
+diff --git a/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c b/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
+index 3c84cb121632..8ba5f78baf9c 100644
+--- a/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
++++ b/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
+@@ -1384,7 +1384,10 @@ static int cio2_notifier_bound(struct v4l2_async_notifier *notifier,
+ {
+ 	struct cio2_device *cio2 = to_cio2_device(notifier);
+ 	struct sensor_async_subdev *s_asd = to_sensor_asd(asd);
++	struct device *dev = &cio2->pci_dev->dev;
+ 	struct cio2_queue *q;
++	unsigned int pad;
++	int ret;
+ 
+ 	if (cio2->queue[s_asd->csi2.port].sensor)
+ 		return -EBUSY;
+@@ -1395,7 +1398,26 @@ static int cio2_notifier_bound(struct v4l2_async_notifier *notifier,
+ 	q->sensor = sd;
+ 	q->csi_rx_base = cio2->base + CIO2_REG_PIPE_BASE(q->csi2.port);
+ 
+-	return 0;
++	for (pad = 0; pad < q->sensor->entity.num_pads; pad++)
++		if (q->sensor->entity.pads[pad].flags &
++					MEDIA_PAD_FL_SOURCE)
++			break;
++
++	if (pad == q->sensor->entity.num_pads) {
++		dev_err(dev, "failed to find src pad for %s\n",
++			q->sensor->name);
++		return -ENXIO;
++	}
++
++	ret = media_create_pad_link(&q->sensor->entity, pad, &q->subdev.entity,
++				    CIO2_PAD_SINK, 0);
++	if (ret) {
++		dev_err(dev, "failed to create link for %s\n",
++			q->sensor->name);
++		return ret;
++	}
++
++	return v4l2_device_register_subdev_nodes(&cio2->v4l2_dev);
+ }
+ 
+ /* The .unbind callback */
+@@ -1409,50 +1431,9 @@ static void cio2_notifier_unbind(struct v4l2_async_notifier *notifier,
+ 	cio2->queue[s_asd->csi2.port].sensor = NULL;
+ }
+ 
+-/* .complete() is called after all subdevices have been located */
+-static int cio2_notifier_complete(struct v4l2_async_notifier *notifier)
+-{
+-	struct cio2_device *cio2 = to_cio2_device(notifier);
+-	struct device *dev = &cio2->pci_dev->dev;
+-	struct sensor_async_subdev *s_asd;
+-	struct v4l2_async_subdev *asd;
+-	struct cio2_queue *q;
+-	unsigned int pad;
+-	int ret;
+-
+-	list_for_each_entry(asd, &cio2->notifier.asd_list, asd_list) {
+-		s_asd = to_sensor_asd(asd);
+-		q = &cio2->queue[s_asd->csi2.port];
+-
+-		for (pad = 0; pad < q->sensor->entity.num_pads; pad++)
+-			if (q->sensor->entity.pads[pad].flags &
+-						MEDIA_PAD_FL_SOURCE)
+-				break;
+-
+-		if (pad == q->sensor->entity.num_pads) {
+-			dev_err(dev, "failed to find src pad for %s\n",
+-				q->sensor->name);
+-			return -ENXIO;
+-		}
+-
+-		ret = media_create_pad_link(
+-				&q->sensor->entity, pad,
+-				&q->subdev.entity, CIO2_PAD_SINK,
+-				0);
+-		if (ret) {
+-			dev_err(dev, "failed to create link for %s\n",
+-				q->sensor->name);
+-			return ret;
+-		}
+-	}
+-
+-	return v4l2_device_register_subdev_nodes(&cio2->v4l2_dev);
+-}
+-
+ static const struct v4l2_async_notifier_operations cio2_async_ops = {
+ 	.bound = cio2_notifier_bound,
+ 	.unbind = cio2_notifier_unbind,
+-	.complete = cio2_notifier_complete,
+ };
+ 
+ static int cio2_parse_firmware(struct cio2_device *cio2)
+-- 
+2.41.0
+
+From 4459a5f6408147c79442d0a785221fbf1131a6ac Mon Sep 17 00:00:00 2001
+From: Daniel Scally <djrscally@gmail.com>
+Date: Thu, 2 Jun 2022 22:15:56 +0100
+Subject: [PATCH] media: ipu3-cio2: Re-add .complete() to ipu3-cio2
+
+Removing the .complete() callback had some unintended consequences.
+Because the VCM driver is not directly linked to the ipu3-cio2
+driver .bound() never gets called for it, which means its devnode
+is never created if it probes late. Because .complete() waits for
+any sub-notifiers to also be complete it is captured in that call.
+
+Signed-off-by: Daniel Scally <djrscally@gmail.com>
+Patchset: cameras
+---
+ drivers/media/pci/intel/ipu3/ipu3-cio2-main.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c b/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
+index 8ba5f78baf9c..f0b77012641b 100644
+--- a/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
++++ b/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
+@@ -1431,9 +1431,18 @@ static void cio2_notifier_unbind(struct v4l2_async_notifier *notifier,
+ 	cio2->queue[s_asd->csi2.port].sensor = NULL;
+ }
+ 
++/* .complete() is called after all subdevices have been located */
++static int cio2_notifier_complete(struct v4l2_async_notifier *notifier)
++{
++	struct cio2_device *cio2 = to_cio2_device(notifier);
++
++	return v4l2_device_register_subdev_nodes(&cio2->v4l2_dev);
++}
++
+ static const struct v4l2_async_notifier_operations cio2_async_ops = {
+ 	.bound = cio2_notifier_bound,
+ 	.unbind = cio2_notifier_unbind,
++	.complete = cio2_notifier_complete,
+ };
+ 
+ static int cio2_parse_firmware(struct cio2_device *cio2)
+-- 
+2.41.0
+
+From a7797b5b383a07e06c2ced41ec7e9b719e73392e Mon Sep 17 00:00:00 2001
+From: Daniel Scally <djrscally@gmail.com>
+Date: Thu, 28 Oct 2021 21:55:16 +0100
+Subject: [PATCH] media: i2c: Add driver for DW9719 VCM
+
+Add a driver for the DW9719 VCM. The driver creates a v4l2 subdevice
+and registers a control to set the desired focus.
+
+Signed-off-by: Daniel Scally <djrscally@gmail.com>
+Patchset: cameras
+---
+ MAINTAINERS                |   7 +
+ drivers/media/i2c/Kconfig  |  11 +
+ drivers/media/i2c/Makefile |   1 +
+ drivers/media/i2c/dw9719.c | 425 +++++++++++++++++++++++++++++++++++++
+ 4 files changed, 444 insertions(+)
+ create mode 100644 drivers/media/i2c/dw9719.c
+
+diff --git a/MAINTAINERS b/MAINTAINERS
+index 35e19594640d..7e6631f0b55b 100644
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -6262,6 +6262,13 @@ T:	git git://linuxtv.org/media_tree.git
+ F:	Documentation/devicetree/bindings/media/i2c/dongwoon,dw9714.yaml
+ F:	drivers/media/i2c/dw9714.c
+ 
++DONGWOON DW9719 LENS VOICE COIL DRIVER
++M:	Daniel Scally <djrscally@gmail.com>
++L:	linux-media@vger.kernel.org
++S:	Maintained
++T:	git git://linuxtv.org/media_tree.git
++F:	drivers/media/i2c/dw9719.c
++
+ DONGWOON DW9768 LENS VOICE COIL DRIVER
+ M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
+ L:	linux-media@vger.kernel.org
+diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
+index 256d55bb2b1d..c9587f500a88 100644
+--- a/drivers/media/i2c/Kconfig
++++ b/drivers/media/i2c/Kconfig
+@@ -835,6 +835,17 @@ config VIDEO_DW9714
+ 	  capability. This is designed for linear control of
+ 	  voice coil motors, controlled via I2C serial interface.
+ 
++config VIDEO_DW9719
++	tristate "DW9719 lens voice coil support"
++	depends on I2C && VIDEO_V4L2
++	select MEDIA_CONTROLLER
++	select VIDEO_V4L2_SUBDEV_API
++	select V4L2_ASYNC
++	help
++	  This is a driver for the DW9719 camera lens voice coil.
++	  This is designed for linear control of  voice coil motors,
++	  controlled via I2C serial interface.
++
+ config VIDEO_DW9768
+ 	tristate "DW9768 lens voice coil support"
+ 	depends on I2C && VIDEO_DEV
+diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
+index b44dacf935f4..2a68bfb621b0 100644
+--- a/drivers/media/i2c/Makefile
++++ b/drivers/media/i2c/Makefile
+@@ -29,6 +29,7 @@ obj-$(CONFIG_VIDEO_CS5345) += cs5345.o
+ obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o
+ obj-$(CONFIG_VIDEO_CX25840) += cx25840/
+ obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
++obj-$(CONFIG_VIDEO_DW9719) += dw9719.o
+ obj-$(CONFIG_VIDEO_DW9768) += dw9768.o
+ obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
+ obj-$(CONFIG_VIDEO_ET8EK8) += et8ek8/
+diff --git a/drivers/media/i2c/dw9719.c b/drivers/media/i2c/dw9719.c
+new file mode 100644
+index 000000000000..180b04d2a6b3
+--- /dev/null
++++ b/drivers/media/i2c/dw9719.c
+@@ -0,0 +1,425 @@
++// SPDX-License-Identifier: GPL-2.0
++// Copyright (c) 2012 Intel Corporation
++
++/*
++ * Based on linux/modules/camera/drivers/media/i2c/imx/dw9719.c in this repo:
++ * https://github.com/ZenfoneArea/android_kernel_asus_zenfone5
++ */
++
++#include <asm/unaligned.h>
++
++#include <linux/delay.h>
++#include <linux/i2c.h>
++#include <linux/pm_runtime.h>
++#include <linux/regulator/consumer.h>
++#include <linux/types.h>
++
++#include <media/v4l2-common.h>
++#include <media/v4l2-ctrls.h>
++#include <media/v4l2-subdev.h>
++
++#define DW9719_MAX_FOCUS_POS	1023
++#define DW9719_CTRL_STEPS	16
++#define DW9719_CTRL_DELAY_US	1000
++#define DELAY_MAX_PER_STEP_NS	(1000000 * 1023)
++
++#define DW9719_INFO			0
++#define DW9719_ID			0xF1
++#define DW9719_CONTROL			2
++#define DW9719_VCM_CURRENT		3
++
++#define DW9719_MODE			6
++#define DW9719_VCM_FREQ			7
++
++#define DW9719_MODE_SAC3		0x40
++#define DW9719_DEFAULT_VCM_FREQ		0x60
++#define DW9719_ENABLE_RINGING		0x02
++
++#define NUM_REGULATORS			2
++
++#define to_dw9719_device(x) container_of(x, struct dw9719_device, sd)
++
++struct dw9719_device {
++	struct device *dev;
++	struct i2c_client *client;
++	struct regulator_bulk_data regulators[NUM_REGULATORS];
++	struct v4l2_subdev sd;
++
++	struct dw9719_v4l2_ctrls {
++		struct v4l2_ctrl_handler handler;
++		struct v4l2_ctrl *focus;
++	} ctrls;
++};
++
++static int dw9719_i2c_rd8(struct i2c_client *client, u8 reg, u8 *val)
++{
++	struct i2c_msg msg[2];
++	u8 buf[2] = { reg };
++	int ret;
++
++	msg[0].addr = client->addr;
++	msg[0].flags = 0;
++	msg[0].len = 1;
++	msg[0].buf = buf;
++
++	msg[1].addr = client->addr;
++	msg[1].flags = I2C_M_RD;
++	msg[1].len = 1;
++	msg[1].buf = &buf[1];
++	*val = 0;
++
++	ret = i2c_transfer(client->adapter, msg, 2);
++	if (ret < 0)
++		return ret;
++
++	*val = buf[1];
++
++	return 0;
++}
++
++static int dw9719_i2c_wr8(struct i2c_client *client, u8 reg, u8 val)
++{
++	struct i2c_msg msg;
++	int ret;
++
++	u8 buf[2] = { reg, val };
++
++	msg.addr = client->addr;
++	msg.flags = 0;
++	msg.len = sizeof(buf);
++	msg.buf = buf;
++
++	ret = i2c_transfer(client->adapter, &msg, 1);
++
++	return ret < 0 ? ret : 0;
++}
++
++static int dw9719_i2c_wr16(struct i2c_client *client, u8 reg, u16 val)
++{
++	struct i2c_msg msg;
++	u8 buf[3] = { reg };
++	int ret;
++
++	put_unaligned_be16(val, buf + 1);
++
++	msg.addr = client->addr;
++	msg.flags = 0;
++	msg.len = sizeof(buf);
++	msg.buf = buf;
++
++	ret = i2c_transfer(client->adapter, &msg, 1);
++
++	return ret < 0 ? ret : 0;
++}
++
++static int dw9719_detect(struct dw9719_device *dw9719)
++{
++	int ret;
++	u8 val;
++
++	ret = dw9719_i2c_rd8(dw9719->client, DW9719_INFO, &val);
++	if (ret < 0)
++		return ret;
++
++	if (val != DW9719_ID) {
++		dev_err(dw9719->dev, "Failed to detect correct id\n");
++		ret = -ENXIO;
++	}
++
++	return 0;
++}
++
++static int dw9719_power_down(struct dw9719_device *dw9719)
++{
++	return regulator_bulk_disable(NUM_REGULATORS, dw9719->regulators);
++}
++
++static int dw9719_power_up(struct dw9719_device *dw9719)
++{
++	int ret;
++
++	ret = regulator_bulk_enable(NUM_REGULATORS, dw9719->regulators);
++	if (ret)
++		return ret;
++
++	/* Jiggle SCL pin to wake up device */
++	ret = dw9719_i2c_wr8(dw9719->client, DW9719_CONTROL, 1);
++
++	/* Need 100us to transit from SHUTDOWN to STANDBY*/
++	usleep_range(100, 1000);
++
++	ret = dw9719_i2c_wr8(dw9719->client, DW9719_CONTROL,
++			     DW9719_ENABLE_RINGING);
++	if (ret < 0)
++		goto fail_powerdown;
++
++	ret = dw9719_i2c_wr8(dw9719->client, DW9719_MODE, DW9719_MODE_SAC3);
++	if (ret < 0)
++		goto fail_powerdown;
++
++	ret = dw9719_i2c_wr8(dw9719->client, DW9719_VCM_FREQ,
++			     DW9719_DEFAULT_VCM_FREQ);
++	if (ret < 0)
++		goto fail_powerdown;
++
++	return 0;
++
++fail_powerdown:
++	dw9719_power_down(dw9719);
++	return ret;
++}
++
++static int dw9719_t_focus_abs(struct dw9719_device *dw9719, s32 value)
++{
++	int ret;
++
++	value = clamp(value, 0, DW9719_MAX_FOCUS_POS);
++	ret = dw9719_i2c_wr16(dw9719->client, DW9719_VCM_CURRENT, value);
++	if (ret < 0)
++		return ret;
++
++	return 0;
++}
++
++static int dw9719_set_ctrl(struct v4l2_ctrl *ctrl)
++{
++	struct dw9719_device *dw9719 = container_of(ctrl->handler,
++						    struct dw9719_device,
++						    ctrls.handler);
++	int ret;
++
++	/* Only apply changes to the controls if the device is powered up */
++	if (!pm_runtime_get_if_in_use(dw9719->dev))
++		return 0;
++
++	switch (ctrl->id) {
++	case V4L2_CID_FOCUS_ABSOLUTE:
++		ret = dw9719_t_focus_abs(dw9719, ctrl->val);
++		break;
++	default:
++		ret = -EINVAL;
++	}
++
++	pm_runtime_put(dw9719->dev);
++
++	return ret;
++}
++
++static const struct v4l2_ctrl_ops dw9719_ctrl_ops = {
++	.s_ctrl = dw9719_set_ctrl,
++};
++
++static int __maybe_unused dw9719_suspend(struct device *dev)
++{
++	struct v4l2_subdev *sd = dev_get_drvdata(dev);
++	struct dw9719_device *dw9719 = to_dw9719_device(sd);
++	int ret;
++	int val;
++
++	for (val = dw9719->ctrls.focus->val; val >= 0;
++	     val -= DW9719_CTRL_STEPS) {
++		ret = dw9719_t_focus_abs(dw9719, val);
++		if (ret)
++			return ret;
++
++		usleep_range(DW9719_CTRL_DELAY_US, DW9719_CTRL_DELAY_US + 10);
++	}
++
++	return dw9719_power_down(dw9719);
++}
++
++static int __maybe_unused dw9719_resume(struct device *dev)
++{
++	struct v4l2_subdev *sd = dev_get_drvdata(dev);
++	struct dw9719_device *dw9719 = to_dw9719_device(sd);
++	int current_focus = dw9719->ctrls.focus->val;
++	int ret;
++	int val;
++
++	ret = dw9719_power_up(dw9719);
++	if (ret)
++		return ret;
++
++	for (val = current_focus % DW9719_CTRL_STEPS; val < current_focus;
++	     val += DW9719_CTRL_STEPS) {
++		ret = dw9719_t_focus_abs(dw9719, val);
++		if (ret)
++			goto err_power_down;
++
++		usleep_range(DW9719_CTRL_DELAY_US, DW9719_CTRL_DELAY_US + 10);
++	}
++
++	return 0;
++
++err_power_down:
++	dw9719_power_down(dw9719);
++	return ret;
++}
++
++static int dw9719_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
++{
++	return pm_runtime_resume_and_get(sd->dev);
++}
++
++static int dw9719_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
++{
++	pm_runtime_put(sd->dev);
++
++	return 0;
++}
++
++static const struct v4l2_subdev_internal_ops dw9719_internal_ops = {
++	.open = dw9719_open,
++	.close = dw9719_close,
++};
++
++static int dw9719_init_controls(struct dw9719_device *dw9719)
++{
++	const struct v4l2_ctrl_ops *ops = &dw9719_ctrl_ops;
++	int ret;
++
++	ret = v4l2_ctrl_handler_init(&dw9719->ctrls.handler, 1);
++	if (ret)
++		return ret;
++
++	dw9719->ctrls.focus = v4l2_ctrl_new_std(&dw9719->ctrls.handler, ops,
++						V4L2_CID_FOCUS_ABSOLUTE, 0,
++						DW9719_MAX_FOCUS_POS, 1, 0);
++
++	if (dw9719->ctrls.handler.error) {
++		dev_err(dw9719->dev, "Error initialising v4l2 ctrls\n");
++		ret = dw9719->ctrls.handler.error;
++		goto err_free_handler;
++	}
++
++	dw9719->sd.ctrl_handler = &dw9719->ctrls.handler;
++
++	return ret;
++
++err_free_handler:
++	v4l2_ctrl_handler_free(&dw9719->ctrls.handler);
++	return ret;
++}
++
++static const struct v4l2_subdev_ops dw9719_ops = { };
++
++static int dw9719_probe(struct i2c_client *client)
++{
++	struct dw9719_device *dw9719;
++	int ret;
++
++	dw9719 = devm_kzalloc(&client->dev, sizeof(*dw9719), GFP_KERNEL);
++	if (!dw9719)
++		return -ENOMEM;
++
++	dw9719->client = client;
++	dw9719->dev = &client->dev;
++
++	dw9719->regulators[0].supply = "vdd";
++	/*
++	 * The DW9719 has only the 1 VDD voltage input, but some PMICs such as
++	 * the TPS68470 PMIC have I2C passthrough capability, to disconnect the
++	 * sensor's I2C pins from the I2C bus when the sensors VSIO (Sensor-IO)
++	 * is off, because some sensors then short these pins to ground;
++	 * and the DW9719 might sit behind this passthrough, this it needs to
++	 * enable VSIO as that will also enable the I2C passthrough.
++	 */
++	dw9719->regulators[1].supply = "vsio";
++
++	ret = devm_regulator_bulk_get(&client->dev, NUM_REGULATORS,
++				      dw9719->regulators);
++	if (ret)
++		return dev_err_probe(&client->dev, ret, "getting regulators\n");
++
++	v4l2_i2c_subdev_init(&dw9719->sd, client, &dw9719_ops);
++	dw9719->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
++	dw9719->sd.internal_ops = &dw9719_internal_ops;
++
++	ret = dw9719_init_controls(dw9719);
++	if (ret)
++		return ret;
++
++	ret = media_entity_pads_init(&dw9719->sd.entity, 0, NULL);
++	if (ret < 0)
++		goto err_free_ctrl_handler;
++
++	dw9719->sd.entity.function = MEDIA_ENT_F_LENS;
++
++	/*
++	 * We need the driver to work in the event that pm runtime is disable in
++	 * the kernel, so power up and verify the chip now. In the event that
++	 * runtime pm is disabled this will leave the chip on, so that the lens
++	 * will work.
++	 */
++
++	ret = dw9719_power_up(dw9719);
++	if (ret)
++		goto err_cleanup_media;
++
++	ret = dw9719_detect(dw9719);
++	if (ret)
++		goto err_powerdown;
++
++	pm_runtime_set_active(&client->dev);
++	pm_runtime_get_noresume(&client->dev);
++	pm_runtime_enable(&client->dev);
++
++	ret = v4l2_async_register_subdev(&dw9719->sd);
++	if (ret < 0)
++		goto err_pm_runtime;
++
++	pm_runtime_set_autosuspend_delay(&client->dev, 1000);
++	pm_runtime_use_autosuspend(&client->dev);
++	pm_runtime_put_autosuspend(&client->dev);
++
++	return ret;
++
++err_pm_runtime:
++	pm_runtime_disable(&client->dev);
++	pm_runtime_put_noidle(&client->dev);
++err_powerdown:
++	dw9719_power_down(dw9719);
++err_cleanup_media:
++	media_entity_cleanup(&dw9719->sd.entity);
++err_free_ctrl_handler:
++	v4l2_ctrl_handler_free(&dw9719->ctrls.handler);
++
++	return ret;
++}
++
++static void dw9719_remove(struct i2c_client *client)
++{
++	struct v4l2_subdev *sd = i2c_get_clientdata(client);
++	struct dw9719_device *dw9719 = container_of(sd, struct dw9719_device,
++						    sd);
++
++	pm_runtime_disable(&client->dev);
++	v4l2_async_unregister_subdev(sd);
++	v4l2_ctrl_handler_free(&dw9719->ctrls.handler);
++	media_entity_cleanup(&dw9719->sd.entity);
++}
++
++static const struct i2c_device_id dw9719_id_table[] = {
++	{ "dw9719" },
++	{ }
++};
++MODULE_DEVICE_TABLE(i2c, dw9719_id_table);
++
++static const struct dev_pm_ops dw9719_pm_ops = {
++	SET_RUNTIME_PM_OPS(dw9719_suspend, dw9719_resume, NULL)
++};
++
++static struct i2c_driver dw9719_i2c_driver = {
++	.driver = {
++		.name = "dw9719",
++		.pm = &dw9719_pm_ops,
++	},
++	.probe_new = dw9719_probe,
++	.remove = dw9719_remove,
++	.id_table = dw9719_id_table,
++};
++module_i2c_driver(dw9719_i2c_driver);
++
++MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
++MODULE_DESCRIPTION("DW9719 VCM Driver");
++MODULE_LICENSE("GPL");
+-- 
+2.41.0
+
+From 66226798295760439acb818060adf50ea3704866 Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Fri, 15 Jul 2022 23:48:00 +0200
+Subject: [PATCH] drivers/media/i2c: Fix DW9719 dependencies
+
+It should depend on VIDEO_DEV instead of VIDEO_V4L2.
+
+Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
+Patchset: cameras
+---
+ drivers/media/i2c/Kconfig | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
+index c9587f500a88..0e5a69d5d7ff 100644
+--- a/drivers/media/i2c/Kconfig
++++ b/drivers/media/i2c/Kconfig
+@@ -837,7 +837,7 @@ config VIDEO_DW9714
+ 
+ config VIDEO_DW9719
+ 	tristate "DW9719 lens voice coil support"
+-	depends on I2C && VIDEO_V4L2
++	depends on I2C && VIDEO_DEV
+ 	select MEDIA_CONTROLLER
+ 	select VIDEO_V4L2_SUBDEV_API
+ 	select V4L2_ASYNC
+-- 
+2.41.0
+
+From 2bf3a742b27b978243dcf61508224c49205c66a8 Mon Sep 17 00:00:00 2001
+From: Daniel Scally <dan.scally@ideasonboard.com>
+Date: Thu, 2 Mar 2023 12:59:39 +0000
+Subject: [PATCH] platform/x86: int3472: Remap reset GPIO for INT347E
+
+ACPI _HID INT347E represents the OmniVision 7251 camera sensor. The
+driver for this sensor expects a single pin named "enable", but on
+some Microsoft Surface platforms the sensor is assigned a single
+GPIO who's type flag is INT3472_GPIO_TYPE_RESET.
+
+Remap the GPIO pin's function from "reset" to "enable". This is done
+outside of the existing remap table since it is a more widespread
+discrepancy than that method is designed for. Additionally swap the
+polarity of the pin to match the driver's expectation.
+
+Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
+Patchset: cameras
+---
+ drivers/platform/x86/intel/int3472/discrete.c | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
+index ef020e23e596..d21ef437c2f6 100644
+--- a/drivers/platform/x86/intel/int3472/discrete.c
++++ b/drivers/platform/x86/intel/int3472/discrete.c
+@@ -98,6 +98,9 @@ static int skl_int3472_map_gpio_to_sensor(struct int3472_discrete_device *int347
+ {
+ 	const struct int3472_sensor_config *sensor_config;
+ 	char *path = agpio->resource_source.string_ptr;
++	const struct acpi_device_id ov7251_ids[] = {
++		{ "INT347E" },
++	};
+ 	struct gpiod_lookup *table_entry;
+ 	struct acpi_device *adev;
+ 	acpi_handle handle;
+@@ -120,6 +123,17 @@ static int skl_int3472_map_gpio_to_sensor(struct int3472_discrete_device *int347
+ 		}
+ 	}
+ 
++	/*
++	 * In addition to the function remap table we need to bulk remap the
++	 * "reset" GPIO for the OmniVision 7251 sensor, as the driver for that
++	 * expects its only GPIO pin to be called "enable" (and to have the
++	 * opposite polarity).
++	 */
++	if (!strcmp(func, "reset") && !acpi_match_device_ids(int3472->sensor, ov7251_ids)) {
++		func = "enable";
++		polarity = GPIO_ACTIVE_HIGH;
++	}
++
+ 	/* Functions mapped to NULL should not be mapped to the sensor */
+ 	if (!func)
+ 		return 0;
+-- 
+2.41.0
+
+From f9bda3b580555ebed83e8b9d4a005953f11639a2 Mon Sep 17 00:00:00 2001
+From: Daniel Scally <dan.scally@ideasonboard.com>
+Date: Tue, 21 Mar 2023 13:45:26 +0000
+Subject: [PATCH] media: i2c: Clarify that gain is Analogue gain in OV7251
+
+Update the control ID for the gain control in the ov7251 driver to
+V4L2_CID_ANALOGUE_GAIN.
+
+Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
+Patchset: cameras
+---
+ drivers/media/i2c/ov7251.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/media/i2c/ov7251.c b/drivers/media/i2c/ov7251.c
+index 88e987435285..ff7b2c26da83 100644
+--- a/drivers/media/i2c/ov7251.c
++++ b/drivers/media/i2c/ov7251.c
+@@ -1051,7 +1051,7 @@ static int ov7251_s_ctrl(struct v4l2_ctrl *ctrl)
+ 	case V4L2_CID_EXPOSURE:
+ 		ret = ov7251_set_exposure(ov7251, ctrl->val);
+ 		break;
+-	case V4L2_CID_GAIN:
++	case V4L2_CID_ANALOGUE_GAIN:
+ 		ret = ov7251_set_gain(ov7251, ctrl->val);
+ 		break;
+ 	case V4L2_CID_TEST_PATTERN:
+@@ -1551,7 +1551,7 @@ static int ov7251_init_ctrls(struct ov7251 *ov7251)
+ 	ov7251->exposure = v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
+ 					     V4L2_CID_EXPOSURE, 1, 32, 1, 32);
+ 	ov7251->gain = v4l2_ctrl_new_std(&ov7251->ctrls, &ov7251_ctrl_ops,
+-					 V4L2_CID_GAIN, 16, 1023, 1, 16);
++					 V4L2_CID_ANALOGUE_GAIN, 16, 1023, 1, 16);
+ 	v4l2_ctrl_new_std_menu_items(&ov7251->ctrls, &ov7251_ctrl_ops,
+ 				     V4L2_CID_TEST_PATTERN,
+ 				     ARRAY_SIZE(ov7251_test_pattern_menu) - 1,
+-- 
+2.41.0
+
+From 4de0280de0b911546bdc8f462805da75d5afa9f7 Mon Sep 17 00:00:00 2001
+From: Daniel Scally <dan.scally@ideasonboard.com>
+Date: Wed, 22 Mar 2023 11:01:42 +0000
+Subject: [PATCH] media: v4l2-core: Acquire privacy led in
+ v4l2_async_register_subdev()
+
+The current call to v4l2_subdev_get_privacy_led() is contained in
+v4l2_async_register_subdev_sensor(), but that function isn't used by
+all the sensor drivers. Move the acquisition of the privacy led to
+v4l2_async_register_subdev() instead.
+
+Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
+Patchset: cameras
+---
+ drivers/media/v4l2-core/v4l2-async.c  | 4 ++++
+ drivers/media/v4l2-core/v4l2-fwnode.c | 4 ----
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
+index b16b5f4cb91e..33739a979cbc 100644
+--- a/drivers/media/v4l2-core/v4l2-async.c
++++ b/drivers/media/v4l2-core/v4l2-async.c
+@@ -760,6 +760,10 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
+ 	struct v4l2_async_notifier *notifier;
+ 	int ret;
+ 
++	ret = v4l2_subdev_get_privacy_led(sd);
++	if (ret < 0)
++		return ret;
++
+ 	/*
+ 	 * No reference taken. The reference is held by the device
+ 	 * (struct v4l2_subdev.dev), and async sub-device does not
+diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
+index 049c2f2001ea..f8c3e40b2b71 100644
+--- a/drivers/media/v4l2-core/v4l2-fwnode.c
++++ b/drivers/media/v4l2-core/v4l2-fwnode.c
+@@ -1304,10 +1304,6 @@ int v4l2_async_register_subdev_sensor(struct v4l2_subdev *sd)
+ 
+ 	v4l2_async_nf_init(notifier);
+ 
+-	ret = v4l2_subdev_get_privacy_led(sd);
+-	if (ret < 0)
+-		goto out_cleanup;
+-
+ 	ret = v4l2_async_nf_parse_fwnode_sensor(sd->dev, notifier);
+ 	if (ret < 0)
+ 		goto out_cleanup;
+-- 
+2.41.0
+
+From 39c65419dcb12ee39425ac8231056b2764de9cb0 Mon Sep 17 00:00:00 2001
+From: Kate Hsuan <hpa@redhat.com>
+Date: Tue, 21 Mar 2023 23:37:16 +0800
+Subject: [PATCH] platform: x86: int3472: Add MFD cell for tps68470 LED
+
+Add MFD cell for tps68470-led.
+
+Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
+Signed-off-by: Kate Hsuan <hpa@redhat.com>
+Reviewed-by: Hans de Goede <hdegoede@redhat.com>
+Patchset: cameras
+---
+ drivers/platform/x86/intel/int3472/tps68470.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/platform/x86/intel/int3472/tps68470.c b/drivers/platform/x86/intel/int3472/tps68470.c
+index 6a0ff035cf20..2a7d01d3abc8 100644
+--- a/drivers/platform/x86/intel/int3472/tps68470.c
++++ b/drivers/platform/x86/intel/int3472/tps68470.c
+@@ -17,7 +17,7 @@
+ #define DESIGNED_FOR_CHROMEOS		1
+ #define DESIGNED_FOR_WINDOWS		2
+ 
+-#define TPS68470_WIN_MFD_CELL_COUNT	3
++#define TPS68470_WIN_MFD_CELL_COUNT	4
+ 
+ static const struct mfd_cell tps68470_cros[] = {
+ 	{ .name = "tps68470-gpio" },
+@@ -200,7 +200,8 @@ static int skl_int3472_tps68470_probe(struct i2c_client *client)
+ 		cells[1].name = "tps68470-regulator";
+ 		cells[1].platform_data = (void *)board_data->tps68470_regulator_pdata;
+ 		cells[1].pdata_size = sizeof(struct tps68470_regulator_platform_data);
+-		cells[2].name = "tps68470-gpio";
++		cells[2].name = "tps68470-led";
++		cells[3].name = "tps68470-gpio";
+ 
+ 		for (i = 0; i < board_data->n_gpiod_lookups; i++)
+ 			gpiod_add_lookup_table(board_data->tps68470_gpio_lookup_tables[i]);
+-- 
+2.41.0
+
+From 699ed94263c16719bc0dc36e2eae7a37be89a9f1 Mon Sep 17 00:00:00 2001
+From: Kate Hsuan <hpa@redhat.com>
+Date: Tue, 21 Mar 2023 23:37:17 +0800
+Subject: [PATCH] include: mfd: tps68470: Add masks for LEDA and LEDB
+
+Add flags for both LEDA(TPS68470_ILEDCTL_ENA), LEDB
+(TPS68470_ILEDCTL_ENB), and current control mask for LEDB
+(TPS68470_ILEDCTL_CTRLB)
+
+Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
+Reviewed-by: Hans de Goede <hdegoede@redhat.com>
+Signed-off-by: Kate Hsuan <hpa@redhat.com>
+Patchset: cameras
+---
+ include/linux/mfd/tps68470.h | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/include/linux/mfd/tps68470.h b/include/linux/mfd/tps68470.h
+index 7807fa329db0..2d2abb25b944 100644
+--- a/include/linux/mfd/tps68470.h
++++ b/include/linux/mfd/tps68470.h
+@@ -34,6 +34,7 @@
+ #define TPS68470_REG_SGPO		0x22
+ #define TPS68470_REG_GPDI		0x26
+ #define TPS68470_REG_GPDO		0x27
++#define TPS68470_REG_ILEDCTL		0x28
+ #define TPS68470_REG_VCMVAL		0x3C
+ #define TPS68470_REG_VAUX1VAL		0x3D
+ #define TPS68470_REG_VAUX2VAL		0x3E
+@@ -94,4 +95,8 @@
+ #define TPS68470_GPIO_MODE_OUT_CMOS	2
+ #define TPS68470_GPIO_MODE_OUT_ODRAIN	3
+ 
++#define TPS68470_ILEDCTL_ENA		BIT(2)
++#define TPS68470_ILEDCTL_ENB		BIT(6)
++#define TPS68470_ILEDCTL_CTRLB		GENMASK(5, 4)
++
+ #endif /* __LINUX_MFD_TPS68470_H */
+-- 
+2.41.0
+
+From 77fa5dd16e40d64a5a286a24a24e8d558ac14308 Mon Sep 17 00:00:00 2001
+From: Kate Hsuan <hpa@redhat.com>
+Date: Tue, 21 Mar 2023 23:37:18 +0800
+Subject: [PATCH] leds: tps68470: Add LED control for tps68470
+
+There are two LED controllers, LEDA indicator LED and LEDB flash LED for
+tps68470. LEDA can be enabled by setting TPS68470_ILEDCTL_ENA. Moreover,
+tps68470 provides four levels of power status for LEDB. If the
+properties called "ti,ledb-current" can be found, the current will be
+set according to the property values. These two LEDs can be controlled
+through the LED class of sysfs (tps68470-leda and tps68470-ledb).
+
+Signed-off-by: Kate Hsuan <hpa@redhat.com>
+Reviewed-by: Hans de Goede <hdegoede@redhat.com>
+Patchset: cameras
+---
+ drivers/leds/Kconfig         |  12 +++
+ drivers/leds/Makefile        |   1 +
+ drivers/leds/leds-tps68470.c | 185 +++++++++++++++++++++++++++++++++++
+ 3 files changed, 198 insertions(+)
+ create mode 100644 drivers/leds/leds-tps68470.c
+
+diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
+index 2c5fdf848210..ead139f0df52 100644
+--- a/drivers/leds/Kconfig
++++ b/drivers/leds/Kconfig
+@@ -841,6 +841,18 @@ config LEDS_TPS6105X
+ 	  It is a single boost converter primarily for white LEDs and
+ 	  audio amplifiers.
+ 
++config LEDS_TPS68470
++	tristate "LED support for TI TPS68470"
++	depends on LEDS_CLASS
++	depends on INTEL_SKL_INT3472
++	help
++	  This driver supports TPS68470 PMIC with LED chip.
++	  It provides two LED controllers, with the ability to drive 2
++	  indicator LEDs and 2 flash LEDs.
++
++	  To compile this driver as a module, choose M and it will be
++	  called leds-tps68470
++
+ config LEDS_IP30
+ 	tristate "LED support for SGI Octane machines"
+ 	depends on LEDS_CLASS
+diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
+index c07d1512c745..dd78cb6ef22e 100644
+--- a/drivers/leds/Makefile
++++ b/drivers/leds/Makefile
+@@ -81,6 +81,7 @@ obj-$(CONFIG_LEDS_TCA6507)		+= leds-tca6507.o
+ obj-$(CONFIG_LEDS_TI_LMU_COMMON)	+= leds-ti-lmu-common.o
+ obj-$(CONFIG_LEDS_TLC591XX)		+= leds-tlc591xx.o
+ obj-$(CONFIG_LEDS_TPS6105X)		+= leds-tps6105x.o
++obj-$(CONFIG_LEDS_TPS68470)		+= leds-tps68470.o
+ obj-$(CONFIG_LEDS_TURRIS_OMNIA)		+= leds-turris-omnia.o
+ obj-$(CONFIG_LEDS_WM831X_STATUS)	+= leds-wm831x-status.o
+ obj-$(CONFIG_LEDS_WM8350)		+= leds-wm8350.o
+diff --git a/drivers/leds/leds-tps68470.c b/drivers/leds/leds-tps68470.c
+new file mode 100644
+index 000000000000..35aeb5db89c8
+--- /dev/null
++++ b/drivers/leds/leds-tps68470.c
+@@ -0,0 +1,185 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * LED driver for TPS68470 PMIC
++ *
++ * Copyright (C) 2023 Red Hat
++ *
++ * Authors:
++ *	Kate Hsuan <hpa@redhat.com>
++ */
++
++#include <linux/leds.h>
++#include <linux/mfd/tps68470.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/property.h>
++#include <linux/regmap.h>
++
++
++#define lcdev_to_led(led_cdev) \
++	container_of(led_cdev, struct tps68470_led, lcdev)
++
++#define led_to_tps68470(led, index) \
++	container_of(led, struct tps68470_device, leds[index])
++
++enum tps68470_led_ids {
++	TPS68470_ILED_A,
++	TPS68470_ILED_B,
++	TPS68470_NUM_LEDS
++};
++
++static const char *tps68470_led_names[] = {
++	[TPS68470_ILED_A] = "tps68470-iled_a",
++	[TPS68470_ILED_B] = "tps68470-iled_b",
++};
++
++struct tps68470_led {
++	unsigned int led_id;
++	struct led_classdev lcdev;
++};
++
++struct tps68470_device {
++	struct device *dev;
++	struct regmap *regmap;
++	struct tps68470_led leds[TPS68470_NUM_LEDS];
++};
++
++enum ctrlb_current {
++	CTRLB_2MA	= 0,
++	CTRLB_4MA	= 1,
++	CTRLB_8MA	= 2,
++	CTRLB_16MA	= 3,
++};
++
++static int tps68470_brightness_set(struct led_classdev *led_cdev, enum led_brightness brightness)
++{
++	struct tps68470_led *led = lcdev_to_led(led_cdev);
++	struct tps68470_device *tps68470 = led_to_tps68470(led, led->led_id);
++	struct regmap *regmap = tps68470->regmap;
++
++	switch (led->led_id) {
++	case TPS68470_ILED_A:
++		return regmap_update_bits(regmap, TPS68470_REG_ILEDCTL, TPS68470_ILEDCTL_ENA,
++					  brightness ? TPS68470_ILEDCTL_ENA : 0);
++	case TPS68470_ILED_B:
++		return regmap_update_bits(regmap, TPS68470_REG_ILEDCTL, TPS68470_ILEDCTL_ENB,
++					  brightness ? TPS68470_ILEDCTL_ENB : 0);
++	}
++	return -EINVAL;
++}
++
++static enum led_brightness tps68470_brightness_get(struct led_classdev *led_cdev)
++{
++	struct tps68470_led *led = lcdev_to_led(led_cdev);
++	struct tps68470_device *tps68470 = led_to_tps68470(led, led->led_id);
++	struct regmap *regmap = tps68470->regmap;
++	int ret = 0;
++	int value = 0;
++
++	ret =  regmap_read(regmap, TPS68470_REG_ILEDCTL, &value);
++	if (ret)
++		return dev_err_probe(led_cdev->dev, -EINVAL, "failed on reading register\n");
++
++	switch (led->led_id) {
++	case TPS68470_ILED_A:
++		value = value & TPS68470_ILEDCTL_ENA;
++		break;
++	case TPS68470_ILED_B:
++		value = value & TPS68470_ILEDCTL_ENB;
++		break;
++	}
++
++	return value ? LED_ON : LED_OFF;
++}
++
++
++static int tps68470_ledb_current_init(struct platform_device *pdev,
++				      struct tps68470_device *tps68470)
++{
++	int ret = 0;
++	unsigned int curr;
++
++	/* configure LEDB current if the properties can be got */
++	if (!device_property_read_u32(&pdev->dev, "ti,ledb-current", &curr)) {
++		if (curr > CTRLB_16MA) {
++			dev_err(&pdev->dev,
++				"Invalid LEDB current value: %d\n",
++				curr);
++			return -EINVAL;
++		}
++		ret = regmap_update_bits(tps68470->regmap, TPS68470_REG_ILEDCTL,
++					 TPS68470_ILEDCTL_CTRLB, curr);
++	}
++	return ret;
++}
++
++static int tps68470_leds_probe(struct platform_device *pdev)
++{
++	int i = 0;
++	int ret = 0;
++	struct tps68470_device *tps68470;
++	struct tps68470_led *led;
++	struct led_classdev *lcdev;
++
++	tps68470 = devm_kzalloc(&pdev->dev, sizeof(struct tps68470_device),
++				GFP_KERNEL);
++	if (!tps68470)
++		return -ENOMEM;
++
++	tps68470->dev = &pdev->dev;
++	tps68470->regmap = dev_get_drvdata(pdev->dev.parent);
++
++	for (i = 0; i < TPS68470_NUM_LEDS; i++) {
++		led = &tps68470->leds[i];
++		lcdev = &led->lcdev;
++
++		led->led_id = i;
++
++		lcdev->name = devm_kasprintf(tps68470->dev, GFP_KERNEL, "%s::%s",
++					     tps68470_led_names[i], LED_FUNCTION_INDICATOR);
++		if (!lcdev->name)
++			return -ENOMEM;
++
++		lcdev->max_brightness = 1;
++		lcdev->brightness = 0;
++		lcdev->brightness_set_blocking = tps68470_brightness_set;
++		lcdev->brightness_get = tps68470_brightness_get;
++		lcdev->dev = &pdev->dev;
++
++		ret = devm_led_classdev_register(tps68470->dev, lcdev);
++		if (ret) {
++			dev_err_probe(tps68470->dev, ret,
++				      "error registering led\n");
++			goto err_exit;
++		}
++
++		if (i == TPS68470_ILED_B) {
++			ret = tps68470_ledb_current_init(pdev, tps68470);
++			if (ret)
++				goto err_exit;
++		}
++	}
++
++err_exit:
++	if (ret) {
++		for (i = 0; i < TPS68470_NUM_LEDS; i++) {
++			if (tps68470->leds[i].lcdev.name)
++				devm_led_classdev_unregister(&pdev->dev,
++							     &tps68470->leds[i].lcdev);
++		}
++	}
++
++	return ret;
++}
++static struct platform_driver tps68470_led_driver = {
++	.driver = {
++		   .name = "tps68470-led",
++	},
++	.probe = tps68470_leds_probe,
++};
++
++module_platform_driver(tps68470_led_driver);
++
++MODULE_ALIAS("platform:tps68470-led");
++MODULE_DESCRIPTION("LED driver for TPS68470 PMIC");
++MODULE_LICENSE("GPL v2");
+-- 
+2.41.0
+

patches/6.4/0012-amd-gpio.patch

@@ -0,0 +1,109 @@
+From 35e92db3bbc48f7ed21a12176cc735cac34d0640 Mon Sep 17 00:00:00 2001
+From: Sachi King <nakato@nakato.io>
+Date: Sat, 29 May 2021 17:47:38 +1000
+Subject: [PATCH] ACPI: Add quirk for Surface Laptop 4 AMD missing irq 7
+ override
+
+This patch is the work of Thomas Gleixner <tglx@linutronix.de> and is
+copied from:
+https://lore.kernel.org/lkml/87lf8ddjqx.ffs@nanos.tec.linutronix.de/
+
+This patch adds a quirk to the ACPI setup to patch in the the irq 7 pin
+setup that is missing in the laptops ACPI table.
+
+This patch was used for validation of the issue, and is not a proper
+fix, but is probably a better temporary hack than continuing to probe
+the Legacy PIC and run with the PIC in an unknown state.
+
+Patchset: amd-gpio
+---
+ arch/x86/kernel/acpi/boot.c | 17 +++++++++++++++++
+ 1 file changed, 17 insertions(+)
+
+diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
+index 21b542a6866c..fdd602e640b5 100644
+--- a/arch/x86/kernel/acpi/boot.c
++++ b/arch/x86/kernel/acpi/boot.c
+@@ -22,6 +22,7 @@
+ #include <linux/efi-bgrt.h>
+ #include <linux/serial_core.h>
+ #include <linux/pgtable.h>
++#include <linux/dmi.h>
+ 
+ #include <asm/e820/api.h>
+ #include <asm/irqdomain.h>
+@@ -1252,6 +1253,17 @@ static void __init mp_config_acpi_legacy_irqs(void)
+ 	}
+ }
+ 
++static const struct dmi_system_id surface_quirk[] __initconst = {
++	{
++		.ident = "Microsoft Surface Laptop 4 (AMD)",
++		.matches = {
++			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
++			DMI_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_4_1952:1953")
++		},
++	},
++	{}
++};
++
+ /*
+  * Parse IOAPIC related entries in MADT
+  * returns 0 on success, < 0 on error
+@@ -1307,6 +1319,11 @@ static int __init acpi_parse_madt_ioapic_entries(void)
+ 		acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
+ 				      acpi_gbl_FADT.sci_interrupt);
+ 
++	if (dmi_check_system(surface_quirk)) {
++		pr_warn("Surface hack: Override irq 7\n");
++		mp_override_legacy_irq(7, 3, 3, 7);
++	}
++
+ 	/* Fill in identity legacy mappings where no override */
+ 	mp_config_acpi_legacy_irqs();
+ 
+-- 
+2.41.0
+
+From af8bc8ccc9017671ae0240ddf1602981b0828fd6 Mon Sep 17 00:00:00 2001
+From: Maximilian Luz <luzmaximilian@gmail.com>
+Date: Thu, 3 Jun 2021 14:04:26 +0200
+Subject: [PATCH] ACPI: Add AMD 13" Surface Laptop 4 model to irq 7 override
+ quirk
+
+The 13" version of the Surface Laptop 4 has the same problem as the 15"
+version, but uses a different SKU. Add that SKU to the quirk as well.
+
+Patchset: amd-gpio
+---
+ arch/x86/kernel/acpi/boot.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
+index fdd602e640b5..4e94eed20088 100644
+--- a/arch/x86/kernel/acpi/boot.c
++++ b/arch/x86/kernel/acpi/boot.c
+@@ -1255,12 +1255,19 @@ static void __init mp_config_acpi_legacy_irqs(void)
+ 
+ static const struct dmi_system_id surface_quirk[] __initconst = {
+ 	{
+-		.ident = "Microsoft Surface Laptop 4 (AMD)",
++		.ident = "Microsoft Surface Laptop 4 (AMD 15\")",
+ 		.matches = {
+ 			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
+ 			DMI_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_4_1952:1953")
+ 		},
+ 	},
++	{
++		.ident = "Microsoft Surface Laptop 4 (AMD 13\")",
++		.matches = {
++			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
++			DMI_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_4_1958:1959")
++		},
++	},
+ 	{}
+ };
+ 
+-- 
+2.41.0
+

patches/6.4/0013-rtc.patch

@@ -0,0 +1,109 @@
+From bb78b890618ace48326df941db557d54bb5d641f Mon Sep 17 00:00:00 2001
+From: "Bart Groeneveld | GPX Solutions B.V" <bart@gpxbv.nl>
+Date: Mon, 5 Dec 2022 16:08:46 +0100
+Subject: [PATCH] acpi: allow usage of acpi_tad on HW-reduced platforms
+
+The specification [1] allows so-called HW-reduced platforms,
+which do not implement everything, especially the wakeup related stuff.
+
+In that case, it is still usable as a RTC. This is helpful for [2]
+and [3], which is about a device with no other working RTC,
+but it does have an HW-reduced TAD, which can be used as a RTC instead.
+
+[1]: https://uefi.org/specs/ACPI/6.5/09_ACPI_Defined_Devices_and_Device_Specific_Objects.html#time-and-alarm-device
+[2]: https://bugzilla.kernel.org/show_bug.cgi?id=212313
+[3]: https://github.com/linux-surface/linux-surface/issues/415
+
+Signed-off-by: Bart Groeneveld | GPX Solutions B.V. <bart@gpxbv.nl>
+Patchset: rtc
+---
+ drivers/acpi/acpi_tad.c | 35 ++++++++++++++++++++++++-----------
+ 1 file changed, 24 insertions(+), 11 deletions(-)
+
+diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
+index e9b8e8305e23..944276934e7e 100644
+--- a/drivers/acpi/acpi_tad.c
++++ b/drivers/acpi/acpi_tad.c
+@@ -432,6 +432,14 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
+ 
+ static DEVICE_ATTR_RO(caps);
+ 
++static struct attribute *acpi_tad_attrs[] = {
++	&dev_attr_caps.attr,
++	NULL,
++};
++static const struct attribute_group acpi_tad_attr_group = {
++	.attrs	= acpi_tad_attrs,
++};
++
+ static ssize_t ac_alarm_store(struct device *dev, struct device_attribute *attr,
+ 			      const char *buf, size_t count)
+ {
+@@ -480,15 +488,14 @@ static ssize_t ac_status_show(struct device *dev, struct device_attribute *attr,
+ 
+ static DEVICE_ATTR_RW(ac_status);
+ 
+-static struct attribute *acpi_tad_attrs[] = {
+-	&dev_attr_caps.attr,
++static struct attribute *acpi_tad_ac_attrs[] = {
+ 	&dev_attr_ac_alarm.attr,
+ 	&dev_attr_ac_policy.attr,
+ 	&dev_attr_ac_status.attr,
+ 	NULL,
+ };
+-static const struct attribute_group acpi_tad_attr_group = {
+-	.attrs	= acpi_tad_attrs,
++static const struct attribute_group acpi_tad_ac_attr_group = {
++	.attrs	= acpi_tad_ac_attrs,
+ };
+ 
+ static ssize_t dc_alarm_store(struct device *dev, struct device_attribute *attr,
+@@ -563,13 +570,18 @@ static int acpi_tad_remove(struct platform_device *pdev)
+ 
+ 	pm_runtime_get_sync(dev);
+ 
++	if (dd->capabilities & ACPI_TAD_AC_WAKE)
++		sysfs_remove_group(&dev->kobj, &acpi_tad_ac_attr_group);
++
+ 	if (dd->capabilities & ACPI_TAD_DC_WAKE)
+ 		sysfs_remove_group(&dev->kobj, &acpi_tad_dc_attr_group);
+ 
+ 	sysfs_remove_group(&dev->kobj, &acpi_tad_attr_group);
+ 
+-	acpi_tad_disable_timer(dev, ACPI_TAD_AC_TIMER);
+-	acpi_tad_clear_status(dev, ACPI_TAD_AC_TIMER);
++	if (dd->capabilities & ACPI_TAD_AC_WAKE) {
++		acpi_tad_disable_timer(dev, ACPI_TAD_AC_TIMER);
++		acpi_tad_clear_status(dev, ACPI_TAD_AC_TIMER);
++	}
+ 	if (dd->capabilities & ACPI_TAD_DC_WAKE) {
+ 		acpi_tad_disable_timer(dev, ACPI_TAD_DC_TIMER);
+ 		acpi_tad_clear_status(dev, ACPI_TAD_DC_TIMER);
+@@ -604,11 +616,6 @@ static int acpi_tad_probe(struct platform_device *pdev)
+ 		return -ENODEV;
+ 	}
+ 
+-	if (!acpi_has_method(handle, "_PRW")) {
+-		dev_info(dev, "Missing _PRW\n");
+-		return -ENODEV;
+-	}
+-
+ 	dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
+ 	if (!dd)
+ 		return -ENOMEM;
+@@ -637,6 +644,12 @@ static int acpi_tad_probe(struct platform_device *pdev)
+ 	if (ret)
+ 		goto fail;
+ 
++	if (caps & ACPI_TAD_AC_WAKE) {
++		ret = sysfs_create_group(&dev->kobj, &acpi_tad_ac_attr_group);
++		if (ret)
++			goto fail;
++	}
++
+ 	if (caps & ACPI_TAD_DC_WAKE) {
+ 		ret = sysfs_create_group(&dev->kobj, &acpi_tad_dc_attr_group);
+ 		if (ret)
+-- 
+2.41.0
+