William Hubbs | c6e3fd2 | 2010-10-07 13:20:02 -0500 | [diff] [blame] | 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 | |
Samuel Thibault | d9f5420 | 2013-01-02 02:36:56 +0100 | [diff] [blame] | 31 | static DEFINE_PER_CPU(bool, reporting_keystroke); |
William Hubbs | c6e3fd2 | 2010-10-07 13:20:02 -0500 | [diff] [blame] | 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); |
William Hubbs | c6e3fd2 | 2010-10-07 13:20:02 -0500 | [diff] [blame] | 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 | |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 81 | __this_cpu_write(reporting_keystroke, true); |
William Hubbs | c6e3fd2 | 2010-10-07 13:20:02 -0500 | [diff] [blame] | 82 | input_report_key(virt_keyboard, KEY_DOWN, PRESSED); |
| 83 | input_report_key(virt_keyboard, KEY_DOWN, RELEASED); |
Christoph Lameter | 4a6f4fe | 2010-12-06 11:16:24 -0600 | [diff] [blame] | 84 | __this_cpu_write(reporting_keystroke, false); |
William Hubbs | c6e3fd2 | 2010-10-07 13:20:02 -0500 | [diff] [blame] | 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 | { |
Christoph Lameter | 5309665 | 2010-12-06 11:16:26 -0600 | [diff] [blame] | 98 | return this_cpu_read(reporting_keystroke); |
William Hubbs | c6e3fd2 | 2010-10-07 13:20:02 -0500 | [diff] [blame] | 99 | } |