2010-10-07 12:20:02 -06:00
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/* fakekey.c
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* Functions for simulating keypresses.
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*
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* Copyright (C) 2010 the Speakup Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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DEFINE_PER_CPU(bool, 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 != NULL) {
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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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2010-12-06 10:16:24 -07:00
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__this_cpu_write(reporting_keystroke, true);
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2010-10-07 12:20:02 -06:00
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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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2010-12-06 10:16:24 -07:00
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__this_cpu_write(reporting_keystroke, false);
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2010-10-07 12:20:02 -06:00
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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 keypress 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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2010-12-06 10:16:26 -07:00
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return this_cpu_read(reporting_keystroke);
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2010-10-07 12:20:02 -06:00
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}
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