https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 6d796c50f84ca79f1722bb131799e5a5710c4700 authored by Linus Torvalds on 29 January 2023, 21:59:43 UTC
Linux 6.2-rc6
Linux 6.2-rc6
Tip revision: 6d796c5
fakekey.c
// SPDX-License-Identifier: GPL-2.0+
/* fakekey.c
* Functions for simulating key presses.
*
* Copyright (C) 2010 the Speakup Team
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/preempt.h>
#include <linux/percpu.h>
#include <linux/input.h>
#include "speakup.h"
#define PRESSED 1
#define RELEASED 0
static DEFINE_PER_CPU(int, reporting_keystroke);
static struct input_dev *virt_keyboard;
int speakup_add_virtual_keyboard(void)
{
int err;
virt_keyboard = input_allocate_device();
if (!virt_keyboard)
return -ENOMEM;
virt_keyboard->name = "Speakup";
virt_keyboard->id.bustype = BUS_VIRTUAL;
virt_keyboard->phys = "speakup/input0";
virt_keyboard->dev.parent = NULL;
__set_bit(EV_KEY, virt_keyboard->evbit);
__set_bit(KEY_DOWN, virt_keyboard->keybit);
err = input_register_device(virt_keyboard);
if (err) {
input_free_device(virt_keyboard);
virt_keyboard = NULL;
}
return err;
}
void speakup_remove_virtual_keyboard(void)
{
if (virt_keyboard) {
input_unregister_device(virt_keyboard);
virt_keyboard = NULL;
}
}
/*
* Send a simulated down-arrow to the application.
*/
void speakup_fake_down_arrow(void)
{
unsigned long flags;
/* disable keyboard interrupts */
local_irq_save(flags);
/* don't change CPU */
preempt_disable();
__this_cpu_write(reporting_keystroke, true);
input_report_key(virt_keyboard, KEY_DOWN, PRESSED);
input_report_key(virt_keyboard, KEY_DOWN, RELEASED);
input_sync(virt_keyboard);
__this_cpu_write(reporting_keystroke, false);
/* reenable preemption */
preempt_enable();
/* reenable keyboard interrupts */
local_irq_restore(flags);
}
/*
* Are we handling a simulated key press on the current CPU?
* Returns a boolean.
*/
bool speakup_fake_key_pressed(void)
{
return this_cpu_read(reporting_keystroke);
}