include/linux/keychord.h

   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 __LINUX_KEYCHORD_H_
  19 #define __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  */
  36 struct 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  /* __LINUX_KEYCHORD_H_ */