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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2007-10-19 02:39:12 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 14:53:33 -0400
commit41ab4396e19fba338baf28044d3e48385744b930 (patch)
treeb817fc991bfef4b3d84e76f4793e1483ed4d4238 /include/linux/keyboard.h
parentc18479fe017b9d3b65b7682f2b9e711389441186 (diff)
Console keyboard events and accessibility
Some blind people use a kernel engine called Speakup which uses hardware synthesis to speak what gets displayed on the screen. They use the PC keyboard to control this engine (start/stop, accelerate, ...) and also need to get keyboard feedback (to make sure to know what they are typing, the caps lock status, etc.) Up to now, the way it was done was very ugly. Below is a patch to add a notifier list for permitting a far better implementation, see ChangeLog above for details. You may wonder why this can't be done at the input layer. The problem is that what people want to monitor is the console keyboard, i.e. all input keyboards that got attached to the console, and with the currently active keymap (i.e. keysyms, not only keycodes). This adds a keyboard notifier that such modules can use to get the keyboard events and possibly eat them, at several stages: - keycodes: even before translation into keysym. - unbound keycodes: when no keysym is bound. - unicode: when the keycode would get translated into a unicode character. - keysym: when the keycode would get translated into a keysym. - post_keysym: after the keysym got interpreted, so as to see the result (caps lock, etc.) This also provides access to k_handler so as to permit simulation of keypresses. [akpm@linux-foundation.org: various fixes] Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/keyboard.h')
-rw-r--r--include/linux/keyboard.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/keyboard.h b/include/linux/keyboard.h
index 33b5c2e325b9..65c2d70853e9 100644
--- a/include/linux/keyboard.h
+++ b/include/linux/keyboard.h
@@ -23,10 +23,21 @@
23#define MAX_NR_OF_USER_KEYMAPS 256 /* should be at least 7 */ 23#define MAX_NR_OF_USER_KEYMAPS 256 /* should be at least 7 */
24 24
25#ifdef __KERNEL__ 25#ifdef __KERNEL__
26struct notifier_block;
26extern const int NR_TYPES; 27extern const int NR_TYPES;
27extern const int max_vals[]; 28extern const int max_vals[];
28extern unsigned short *key_maps[MAX_NR_KEYMAPS]; 29extern unsigned short *key_maps[MAX_NR_KEYMAPS];
29extern unsigned short plain_map[NR_KEYS]; 30extern unsigned short plain_map[NR_KEYS];
31
32struct keyboard_notifier_param {
33 struct vc_data *vc; /* VC on which the keyboard press was done */
34 int down; /* Pressure of the key? */
35 int shift; /* Current shift mask */
36 unsigned int value; /* keycode, unicode value or keysym */
37};
38
39extern int register_keyboard_notifier(struct notifier_block *nb);
40extern int unregister_keyboard_notifier(struct notifier_block *nb);
30#endif 41#endif
31 42
32#define MAX_NR_FUNC 256 /* max nr of strings assigned to keys */ 43#define MAX_NR_FUNC 256 /* max nr of strings assigned to keys */