88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/* fakekey.c
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* Functions for simulating key presses.
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*
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* Copyright (C) 2010 the Speakup Team
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/preempt.h>
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#include <linux/percpu.h>
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#include <linux/input.h>
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#include "speakup.h"
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#define PRESSED 1
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#define RELEASED 0
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static DEFINE_PER_CPU(int, reporting_keystroke);
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static struct input_dev *virt_keyboard;
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int speakup_add_virtual_keyboard(void)
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{
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int err;
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virt_keyboard = input_allocate_device();
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if (!virt_keyboard)
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return -ENOMEM;
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virt_keyboard->name = "Speakup";
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virt_keyboard->id.bustype = BUS_VIRTUAL;
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virt_keyboard->phys = "speakup/input0";
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virt_keyboard->dev.parent = NULL;
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__set_bit(EV_KEY, virt_keyboard->evbit);
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__set_bit(KEY_DOWN, virt_keyboard->keybit);
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err = input_register_device(virt_keyboard);
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if (err) {
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input_free_device(virt_keyboard);
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virt_keyboard = NULL;
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}
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return err;
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}
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void speakup_remove_virtual_keyboard(void)
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{
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if (virt_keyboard) {
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input_unregister_device(virt_keyboard);
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virt_keyboard = NULL;
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}
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}
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/*
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* Send a simulated down-arrow to the application.
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*/
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void speakup_fake_down_arrow(void)
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{
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unsigned long flags;
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/* disable keyboard interrupts */
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local_irq_save(flags);
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/* don't change CPU */
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preempt_disable();
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__this_cpu_write(reporting_keystroke, true);
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input_report_key(virt_keyboard, KEY_DOWN, PRESSED);
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input_report_key(virt_keyboard, KEY_DOWN, RELEASED);
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input_sync(virt_keyboard);
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__this_cpu_write(reporting_keystroke, false);
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/* reenable preemption */
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preempt_enable();
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/* reenable keyboard interrupts */
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local_irq_restore(flags);
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}
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/*
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* Are we handling a simulated key press on the current CPU?
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* Returns a boolean.
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*/
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bool speakup_fake_key_pressed(void)
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{
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return this_cpu_read(reporting_keystroke);
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}
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