diff options
| author | Mike Lockwood <lockwood@android.com> | 2011-12-02 13:59:14 +0800 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2012-02-14 14:27:56 -0800 |
| commit | e2358c8f4eae656da2f93159847fc65914d4e10f (patch) | |
| tree | 0c118338068ac52148aea7429145f887b0a5f768 /include | |
| parent | 9d479cba2871bc6ad9922d0409130ce1b0e0b739 (diff) | |
input: keychord: Add keychord driver
This driver allows userspace to receive notification when client
specified key combinations are pressed.
The client opens /dev/keychord and writes a list of keychords
for the driver to monitor.
The client then reads or polls /dev/keychord for notifications.
A client specified ID for the keychord is returned from read()
when a keychord press is detected.
Signed-off-by: Mike Lockwood <lockwood@android.com>
keychord: fix to build without CONFIG_PREEMPT
Change-Id: I911f13aeda4224b6fa57863bc7e8972fec8837fb
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/keychord.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/keychord.h b/include/linux/keychord.h new file mode 100644 index 00000000000..856a5850217 --- /dev/null +++ b/include/linux/keychord.h @@ -0,0 +1,52 @@ +/* + * Key chord input driver + * + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood <lockwood@android.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * +*/ + +#ifndef __LINUX_KEYCHORD_H_ +#define __LINUX_KEYCHORD_H_ + +#include <linux/input.h> + +#define KEYCHORD_VERSION 1 + +/* + * One or more input_keychord structs are written to /dev/keychord + * at once to specify the list of keychords to monitor. + * Reading /dev/keychord returns the id of a keychord when the + * keychord combination is pressed. A keychord is signalled when + * all of the keys in the keycode list are in the pressed state. + * The order in which the keys are pressed does not matter. + * The keychord will not be signalled if keys not in the keycode + * list are pressed. + * Keychords will not be signalled on key release events. + */ +struct input_keychord { + /* should be KEYCHORD_VERSION */ + __u16 version; + /* + * client specified ID, returned from read() + * when this keychord is pressed. + */ + __u16 id; + + /* number of keycodes in this keychord */ + __u16 count; + + /* variable length array of keycodes */ + __u16 keycodes[]; +}; + +#endif /* __LINUX_KEYCHORD_H_ */ |