1/*
2 *  Key chord input driver
3 *
4 * Copyright (C) 2008 Google, Inc.
5 * Author: Mike Lockwood <lockwood@android.com>
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
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*/
17
18#ifndef _UAPI_LINUX_KEYCHORD_H_
19#define _UAPI_LINUX_KEYCHORD_H_
20
21#include <linux/input.h>
22
23#define KEYCHORD_VERSION		1
24
25/*
26 * One or more input_keychord structs are written to /dev/keychord
27 * at once to specify the list of keychords to monitor.
28 * Reading /dev/keychord returns the id of a keychord when the
29 * keychord combination is pressed.  A keychord is signalled when
30 * all of the keys in the keycode list are in the pressed state.
31 * The order in which the keys are pressed does not matter.
32 * The keychord will not be signalled if keys not in the keycode
33 * list are pressed.
34 * Keychords will not be signalled on key release events.
35 */
36struct input_keychord {
37	/* should be KEYCHORD_VERSION */
38	__u16 version;
39	/*
40	 * client specified ID, returned from read()
41	 * when this keychord is pressed.
42	 */
43	__u16 id;
44
45	/* number of keycodes in this keychord */
46	__u16 count;
47
48	/* variable length array of keycodes */
49	__u16 keycodes[];
50};
51
52#endif	/* _UAPI_LINUX_KEYCHORD_H_ */
53