adding module for surface book 2 and pro 2017 buttons

patches/4.17/buttons.patch

@@ -0,0 +1,272 @@
+diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
+index 081105a9cfca..a4388b4da98f 100644
+--- a/drivers/platform/x86/Kconfig
++++ b/drivers/platform/x86/Kconfig
+@@ -1158,6 +1158,11 @@ config SURFACE_3_BUTTON
+ 	---help---
+ 	  This driver handles the power/home/volume buttons on the Microsoft Surface 3 tablet.
+ 
++config SURFACEBOOK2_BUTTON
++	tristate "Power/home/volume buttons driver for Microsoft Surface Book 2/ Surface Pro (2017) tablet"
++	---help---
++	  This driver handles the power and volume buttons on the Microsoft Surface Book 2/ Surface Pro (2017) tablet.
++
+ config ACPI_SURFACE
+ 	tristate "Microsoft Surface Extras"
+ 	depends on ACPI
+diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
+index 8fd5b93bb20d..28c4cede2d91 100644
+--- a/drivers/platform/x86/Makefile
++++ b/drivers/platform/x86/Makefile
+@@ -81,6 +81,7 @@ obj-$(CONFIG_INTEL_PMC_IPC)	+= intel_pmc_ipc.o
+ obj-$(CONFIG_SILEAD_DMI)	+= silead_dmi.o
+ obj-$(CONFIG_SURFACE_PRO3_BUTTON)	+= surfacepro3_button.o
+ obj-$(CONFIG_SURFACE_3_BUTTON)	+= surface3_button.o
++obj-$(CONFIG_SURFACEBOOK2_BUTTON) += surfacebook2_button.o
+ obj-$(CONFIG_ACPI_SURFACE)	+= surface_acpi.o
+ obj-$(CONFIG_ACPI_SURFACE)	+= surface_i2c.o
+ obj-$(CONFIG_ACPI_SURFACE)	+= surface_platform.o
+diff --git a/drivers/platform/x86/surfacebook2_button.c b/drivers/platform/x86/surfacebook2_button.c
+new file mode 100644
+index 000000000000..8dc48435b5f4
+--- /dev/null
++++ b/drivers/platform/x86/surfacebook2_button.c
+@@ -0,0 +1,238 @@
++/*
++ * Supports for Surface Book 2 and Surface Pro (2017) power and volume
++ * buttons.
++ *
++ * Based on soc_button_array.c:
++ *
++ * (C) Copyright 2014 Intel Corporation
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; version 2
++ * of the License.
++ */
++
++#include <linux/module.h>
++#include <linux/input.h>
++#include <linux/init.h>
++#include <linux/kernel.h>
++#include <linux/acpi.h>
++#include <linux/gpio/consumer.h>
++#include <linux/gpio_keys.h>
++#include <linux/gpio.h>
++#include <linux/platform_device.h>
++
++struct soc_button_info {
++	const char *name;
++	int acpi_index;
++	unsigned int event_type;
++	unsigned int event_code;
++	bool autorepeat;
++	bool wakeup;
++};
++
++/*
++ * Some of the buttons like volume up/down are auto repeat, while others
++ * are not. To support both, we register two platform devices, and put
++ * buttons into them based on whether the key should be auto repeat.
++ */
++#define BUTTON_TYPES	2
++
++struct soc_button_data {
++	struct platform_device *children[BUTTON_TYPES];
++};
++
++/*
++ * Get the Nth GPIO number from the ACPI object.
++ */
++static int soc_button_lookup_gpio(struct device *dev, int acpi_index)
++{
++	struct gpio_desc *desc;
++	int gpio;
++
++	desc = gpiod_get_index(dev, NULL, acpi_index, GPIOD_ASIS);
++	if (IS_ERR(desc))
++		return PTR_ERR(desc);
++
++	gpio = desc_to_gpio(desc);
++
++	gpiod_put(desc);
++
++	return gpio;
++}
++
++static struct platform_device *
++soc_button_device_create(struct platform_device *pdev,
++			 const struct soc_button_info *button_info,
++			 bool autorepeat)
++{
++	const struct soc_button_info *info;
++	struct platform_device *pd;
++	struct gpio_keys_button *gpio_keys;
++	struct gpio_keys_platform_data *gpio_keys_pdata;
++	int n_buttons = 0;
++	int gpio;
++	int error;
++
++	for (info = button_info; info->name; info++)
++		if (info->autorepeat == autorepeat)
++			n_buttons++;
++
++	gpio_keys_pdata = devm_kzalloc(&pdev->dev,
++				       sizeof(*gpio_keys_pdata) +
++					sizeof(*gpio_keys) * n_buttons,
++				       GFP_KERNEL);
++	if (!gpio_keys_pdata)
++		return ERR_PTR(-ENOMEM);
++
++	gpio_keys = (void *)(gpio_keys_pdata + 1);
++	n_buttons = 0;
++
++	for (info = button_info; info->name; info++) {
++		if (info->autorepeat != autorepeat)
++			continue;
++
++		gpio = soc_button_lookup_gpio(&pdev->dev, info->acpi_index);
++		if (!gpio_is_valid(gpio))
++			continue;
++
++		gpio_keys[n_buttons].type = info->event_type;
++		gpio_keys[n_buttons].code = info->event_code;
++		gpio_keys[n_buttons].gpio = gpio;
++		gpio_keys[n_buttons].active_low = 1;
++		gpio_keys[n_buttons].desc = info->name;
++		gpio_keys[n_buttons].wakeup = info->wakeup;
++		/* These devices often use cheap buttons, use 50 ms debounce */
++		gpio_keys[n_buttons].debounce_interval = 50;
++		n_buttons++;
++	}
++
++	if (n_buttons == 0) {
++		error = -ENODEV;
++		goto err_free_mem;
++	}
++
++	gpio_keys_pdata->buttons = gpio_keys;
++	gpio_keys_pdata->nbuttons = n_buttons;
++	gpio_keys_pdata->rep = autorepeat;
++
++	pd = platform_device_alloc("gpio-keys", PLATFORM_DEVID_AUTO);
++	if (!pd) {
++		error = -ENOMEM;
++		goto err_free_mem;
++	}
++
++	error = platform_device_add_data(pd, gpio_keys_pdata,
++					 sizeof(*gpio_keys_pdata));
++	if (error)
++		goto err_free_pdev;
++
++	error = platform_device_add(pd);
++	if (error)
++		goto err_free_pdev;
++
++	return pd;
++
++err_free_pdev:
++	platform_device_put(pd);
++err_free_mem:
++	devm_kfree(&pdev->dev, gpio_keys_pdata);
++	return ERR_PTR(error);
++}
++
++static int soc_button_remove(struct platform_device *pdev)
++{
++	struct soc_button_data *priv = platform_get_drvdata(pdev);
++
++	int i;
++
++	for (i = 0; i < BUTTON_TYPES; i++)
++		if (priv->children[i])
++			platform_device_unregister(priv->children[i]);
++
++	return 0;
++}
++
++static int soc_button_probe(struct platform_device *pdev)
++{
++	struct device *dev = &pdev->dev;
++	const struct acpi_device_id *id;
++	struct soc_button_info *button_info;
++	struct soc_button_data *priv;
++	struct platform_device *pd;
++	int i;
++	int error;
++
++	id = acpi_match_device(dev->driver->acpi_match_table, dev);
++	if (!id)
++		return -ENODEV;
++
++	button_info = (struct soc_button_info *)id->driver_data;
++
++	error = gpiod_count(dev, NULL);
++	if (error < 0) {
++		dev_dbg(dev, "no GPIO attached, ignoring...\n");
++		return -ENODEV;
++	}
++
++	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
++	if (!priv)
++		return -ENOMEM;
++
++	platform_set_drvdata(pdev, priv);
++
++	for (i = 0; i < BUTTON_TYPES; i++) {
++		pd = soc_button_device_create(pdev, button_info, i == 0);
++		if (IS_ERR(pd)) {
++			error = PTR_ERR(pd);
++			if (error != -ENODEV) {
++				soc_button_remove(pdev);
++				return error;
++			}
++			continue;
++		}
++
++		priv->children[i] = pd;
++	}
++
++	if (!priv->children[0] && !priv->children[1])
++		return -ENODEV;
++
++	if (!id->driver_data)
++		devm_kfree(dev, button_info);
++
++	return 0;
++}
++
++/*
++ * Definition of buttons on the tablet. The ACPI index of each button
++ * is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC
++ * Platforms"
++ */
++static struct soc_button_info soc_button_MSHW0040[] = {
++	{ "power",       0, EV_KEY, KEY_POWER,      false, true  },
++	{ "volume_up",   2, EV_KEY, KEY_VOLUMEUP,   true,  false },
++	{ "volume_down", 4, EV_KEY, KEY_VOLUMEDOWN, true,  false },
++	{ }
++};
++
++static const struct acpi_device_id soc_button_acpi_match[] = {
++	{ "MSHW0040", (unsigned long)soc_button_MSHW0040 },
++	{ }
++};
++
++MODULE_DEVICE_TABLE(acpi, soc_button_acpi_match);
++
++static struct platform_driver soc_button_driver_sb2 = {
++	.probe          = soc_button_probe,
++	.remove		= soc_button_remove,
++	.driver		= {
++		.name = "surfacebook2_button",
++		.acpi_match_table = ACPI_PTR(soc_button_acpi_match),
++	},
++};
++module_platform_driver(soc_button_driver_sb2);
++
++MODULE_AUTHOR("Maximilian Luz");
++MODULE_DESCRIPTION("Surface Book 2/Surface Pro (2017) Button Driver");
++MODULE_LICENSE("GPL v2");