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Kernel: Allow remapping Caps Lock to Control (#6883)

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We use a global setting to determine if Caps Lock should be remapped to
Control because we don't care how keyboard events come in, just that they
should be massaged into different scan codes.

The `proc` filesystem is able to manipulate this global variable using
the `sysctl` utility like so:

```
# sysctl caps_lock_to_ctrl=1
```
This commit is contained in:
Spencer Dixon 2021-05-05 17:10:56 -04:00 committed by GitHub
parent 18d344609f
commit 0f89e47a1a
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GPG key ID: 4AEE18F83AFDEB23
Notes: sideshowbarker 2024-07-18 18:39:36 +09:00 
Author: https://github.com/SpencerCDixon
Commit: https://github.com/SerenityOS/serenity/commit/0f89e47a1a7
Pull-request: https://github.com/SerenityOS/serenity/pull/6883
Reviewed-by: https://github.com/awesomekling
5 changed files with 18 additions and 1 deletions
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1
Kernel/Devices/HID/HIDManagement.cpp
View file

@ -12,6 +12,7 @@
namespace Kernel {
Atomic<bool> g_caps_lock_remapped_to_ctrl;
static AK::Singleton<HIDManagement> s_the;
// clang-format off

3
Kernel/Devices/HID/HIDManagement.h
View file

@ -6,6 +6,7 @@
#pragma once
#include <AK/Atomic.h>
#include <AK/CircularQueue.h>
#include <AK/NonnullRefPtrVector.h>
#include <AK/RefPtr.h>
@ -20,6 +21,8 @@
namespace Kernel {
extern Atomic<bool> g_caps_lock_remapped_to_ctrl;
class HIDDevice;
class I8042Controller;
class MouseDevice;

8
Kernel/Devices/HID/KeyboardDevice.cpp
View file

@ -234,9 +234,15 @@ void KeyboardDevice::key_state_changed(u8 scan_code, bool pressed)
}
}
if (key == Key_CapsLock && pressed)
if (!g_caps_lock_remapped_to_ctrl && key == Key_CapsLock && pressed)
m_caps_lock_on = !m_caps_lock_on;
if (g_caps_lock_remapped_to_ctrl && key == Key_CapsLock)
m_caps_lock_to_ctrl_pressed = pressed;
if (g_caps_lock_remapped_to_ctrl)
update_modifier(Mod_Ctrl, m_caps_lock_to_ctrl_pressed);
Event event;
event.key = key;
event.scancode = m_has_e0_prefix ? 0xe000 + scan_code : scan_code;

1
Kernel/Devices/HID/KeyboardDevice.h
View file

@ -53,6 +53,7 @@ protected:
virtual const char* class_name() const override { return "KeyboardDevice"; }
u8 m_modifiers { 0 };
bool m_caps_lock_to_ctrl_pressed { false };
bool m_caps_lock_on { false };
bool m_num_lock_on { false };
bool m_has_e0_prefix { false };

6
Kernel/FileSystem/ProcFS.cpp
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Spencer Dixon <spencercdixon@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -970,6 +971,7 @@ bool ProcFS::initialize()
{
static Lockable<bool>* kmalloc_stack_helper;
static Lockable<bool>* ubsan_deadly_helper;
static Lockable<bool>* caps_lock_to_ctrl_helper;
if (kmalloc_stack_helper == nullptr) {
kmalloc_stack_helper = new Lockable<bool>();
@ -982,6 +984,10 @@ bool ProcFS::initialize()
ProcFS::add_sys_bool("ubsan_is_deadly", *ubsan_deadly_helper, [] {
UBSanitizer::g_ubsan_is_deadly = ubsan_deadly_helper->resource();
});
caps_lock_to_ctrl_helper = new Lockable<bool>();
ProcFS::add_sys_bool("caps_lock_to_ctrl", *caps_lock_to_ctrl_helper, [] {
Kernel::g_caps_lock_remapped_to_ctrl.exchange(caps_lock_to_ctrl_helper->resource());
});
}
return true;
}