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c6e3fd22 WH |
1 | /* fakekey.c |
2 | * Functions for simulating keypresses. | |
3 | * | |
4 | * Copyright (C) 2010 the Speakup Team | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | #include <linux/types.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/preempt.h> | |
23 | #include <linux/percpu.h> | |
24 | #include <linux/input.h> | |
25 | ||
26 | #include "speakup.h" | |
27 | ||
28 | #define PRESSED 1 | |
29 | #define RELEASED 0 | |
30 | ||
d9f54202 | 31 | static DEFINE_PER_CPU(bool, reporting_keystroke); |
c6e3fd22 WH |
32 | |
33 | static struct input_dev *virt_keyboard; | |
34 | ||
35 | int speakup_add_virtual_keyboard(void) | |
36 | { | |
37 | int err; | |
38 | ||
39 | virt_keyboard = input_allocate_device(); | |
40 | ||
41 | if (!virt_keyboard) | |
42 | return -ENOMEM; | |
43 | ||
44 | virt_keyboard->name = "Speakup"; | |
45 | virt_keyboard->id.bustype = BUS_VIRTUAL; | |
46 | virt_keyboard->phys = "speakup/input0"; | |
47 | virt_keyboard->dev.parent = NULL; | |
48 | ||
49 | __set_bit(EV_KEY, virt_keyboard->evbit); | |
50 | __set_bit(KEY_DOWN, virt_keyboard->keybit); | |
51 | ||
52 | err = input_register_device(virt_keyboard); | |
53 | if (err) { | |
54 | input_free_device(virt_keyboard); | |
55 | virt_keyboard = NULL; | |
56 | } | |
57 | ||
58 | return err; | |
59 | } | |
60 | ||
61 | void speakup_remove_virtual_keyboard(void) | |
62 | { | |
63 | if (virt_keyboard != NULL) { | |
64 | input_unregister_device(virt_keyboard); | |
c6e3fd22 WH |
65 | virt_keyboard = NULL; |
66 | } | |
67 | } | |
68 | ||
69 | /* | |
70 | * Send a simulated down-arrow to the application. | |
71 | */ | |
72 | void speakup_fake_down_arrow(void) | |
73 | { | |
74 | unsigned long flags; | |
75 | ||
76 | /* disable keyboard interrupts */ | |
77 | local_irq_save(flags); | |
78 | /* don't change CPU */ | |
79 | preempt_disable(); | |
80 | ||
4a6f4fe8 | 81 | __this_cpu_write(reporting_keystroke, true); |
c6e3fd22 WH |
82 | input_report_key(virt_keyboard, KEY_DOWN, PRESSED); |
83 | input_report_key(virt_keyboard, KEY_DOWN, RELEASED); | |
4a6f4fe8 | 84 | __this_cpu_write(reporting_keystroke, false); |
c6e3fd22 WH |
85 | |
86 | /* reenable preemption */ | |
87 | preempt_enable(); | |
88 | /* reenable keyboard interrupts */ | |
89 | local_irq_restore(flags); | |
90 | } | |
91 | ||
92 | /* | |
93 | * Are we handling a simulated keypress on the current CPU? | |
94 | * Returns a boolean. | |
95 | */ | |
96 | bool speakup_fake_key_pressed(void) | |
97 | { | |
5309665d | 98 | return this_cpu_read(reporting_keystroke); |
c6e3fd22 | 99 | } |