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Input: add generic support for sparse keymaps

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More and more devices choose to reimplement support for sparse keymaps
first introduced by wistron driver. Move it into a library module so it
can be easily used by interested parties.

Reviewed-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2009-12-04 10:22:23 -08:00
parent 6a47081c37
commit 36203c4f3d
6 changed files with 347 additions and 12 deletions
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62
include/linux/input/sparse-keymap.h Normal file
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#ifndef _SPARSE_KEYMAP_H
#define _SPARSE_KEYMAP_H
/*
* Copyright (c) 2009 Dmitry Torokhov
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#define KE_END 0 /* Indicates end of keymap */
#define KE_KEY 1 /* Ordinary key/button */
#define KE_SW 2 /* Switch (predetermined value) */
#define KE_VSW 3 /* Switch (value supplied at runtime) */
#define KE_IGNORE 4 /* Known entry that should be ignored */
#define KE_LAST KE_IGNORE
/**
* struct key_entry - keymap entry for use in sparse keymap
* @type: Type of the key entry (KE_KEY, KE_SW, KE_VSW, KE_END);
* drivers are allowed to extend the list with their own
* private definitions.
* @code: Device-specific data identifying the button/switch
* @keycode: KEY_* code assigned to a key/button
* @sw.code: SW_* code assigned to a switch
* @sw.value: Value that should be sent in an input even when KE_SW
* switch is toggled. KE_VSW switches ignore this field and
* expect driver to supply value for the event.
*
* This structure defines an entry in a sparse keymap used by some
* input devices for which traditional table-based approach is not
* suitable.
*/
struct key_entry {
int type; /* See KE_* above */
u32 code;
union {
u16 keycode; /* For KE_KEY */
struct { /* For KE_SW, KE_VSW */
u8 code;
u8 value; /* For KE_SW, ignored by KE_VSW */
} sw;
};
};
struct key_entry *sparse_keymap_entry_from_scancode(struct input_dev *dev,
unsigned int code);
struct key_entry *sparse_keymap_entry_from_keycode(struct input_dev *dev,
unsigned int code);
int sparse_keymap_setup(struct input_dev *dev,
const struct key_entry *keymap,
int (*setup)(struct input_dev *, struct key_entry *));
void sparse_keymap_free(struct input_dev *dev);
void sparse_keymap_report_entry(struct input_dev *dev, const struct key_entry *ke,
unsigned int value, bool autorelease);
bool sparse_keymap_report_event(struct input_dev *dev, unsigned int code,
unsigned int value, bool autorelease);
#endif /* _SPARSE_KEYMAP_H */