1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* fakekey.c
* Functions for simulating keypresses.
*
* Copyright (C) 2010 the Speakup Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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 != NULL) {
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);
}
|