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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2007-10-18 23:39:12 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:33 -0700
commit41ab4396e19fba338baf28044d3e48385744b930 (patch)
treeb817fc991bfef4b3d84e76f4793e1483ed4d4238 /include
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')
-rw-r--r--include/linux/keyboard.h11
-rw-r--r--include/linux/notifier.h9
2 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/keyboard.h b/include/linux/keyboard.h
index 33b5c2e325b..65c2d70853e 100644
--- a/include/linux/keyboard.h
+++ b/include/linux/keyboard.h
@@ -23,10 +23,21 @@
#define MAX_NR_OF_USER_KEYMAPS 256 /* should be at least 7 */
#ifdef __KERNEL__
+struct notifier_block;
extern const int NR_TYPES;
extern const int max_vals[];
extern unsigned short *key_maps[MAX_NR_KEYMAPS];
extern unsigned short plain_map[NR_KEYS];
+
+struct keyboard_notifier_param {
+ struct vc_data *vc; /* VC on which the keyboard press was done */
+ int down; /* Pressure of the key? */
+ int shift; /* Current shift mask */
+ unsigned int value; /* keycode, unicode value or keysym */
+};
+
+extern int register_keyboard_notifier(struct notifier_block *nb);
+extern int unregister_keyboard_notifier(struct notifier_block *nb);
#endif
#define MAX_NR_FUNC 256 /* max nr of strings assigned to keys */
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index fad7ff17e46..bd3788084fa 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -231,5 +231,14 @@ static inline int notifier_to_errno(int ret)
#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
+/* Console keyboard events.
+ * Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and
+ * KBD_KEYSYM. */
+#define KBD_KEYCODE 0x0001 /* Keyboard keycode, called before any other */
+#define KBD_UNBOUND_KEYCODE 0x0002 /* Keyboard keycode which is not bound to any other */
+#define KBD_UNICODE 0x0003 /* Keyboard unicode */
+#define KBD_KEYSYM 0x0004 /* Keyboard keysym */
+#define KBD_POST_KEYSYM 0x0005 /* Called after keyboard keysym interpretation */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */