// SPDX-License-Identifier: GPL-2.0+
|
/* fakekey.c
|
* Functions for simulating keypresses.
|
*
|
* 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 keypress on the current CPU?
|
* Returns a boolean.
|
*/
|
bool speakup_fake_key_pressed(void)
|
{
|
return this_cpu_read(reporting_keystroke);
|
}
|
