Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=41ab4396e19fba338baf28044d3e48385744b930
Commit: 41ab4396e19fba338baf28044d3e48385744b930
Parent: c18479fe017b9d3b65b7682f2b9e711389441186
Author: Samuel Thibault <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 18 23:39:12 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Oct 19 11:53:33 2007 -0700
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.
[EMAIL PROTECTED]: various fixes]
Signed-off-by: Samuel Thibault <[EMAIL PROTECTED]>
Cc: Jiri Kosina <[EMAIL PROTECTED]>
Cc: Dmitry Torokhov <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/char/keyboard.c | 42 ++++++++++++++++++++++++++++++++++++------
include/linux/keyboard.h | 11 +++++++++++
include/linux/notifier.h | 9 +++++++++
3 files changed, 56 insertions(+), 6 deletions(-)
diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 212276a..d54f4a3 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -42,6 +42,7 @@
#include <linux/sysrq.h>
#include <linux/input.h>
#include <linux/reboot.h>
+#include <linux/notifier.h>
extern void ctrl_alt_del(void);
@@ -81,7 +82,8 @@ void compute_shiftstate(void);
typedef void (k_handler_fn)(struct vc_data *vc, unsigned char value,
char up_flag);
static k_handler_fn K_HANDLERS;
-static k_handler_fn *k_handler[16] = { K_HANDLERS };
+k_handler_fn *k_handler[16] = { K_HANDLERS };
+EXPORT_SYMBOL_GPL(k_handler);
#define FN_HANDLERS\
fn_null, fn_enter, fn_show_ptregs, fn_show_mem,\
@@ -160,6 +162,23 @@ static int sysrq_alt_use;
static int sysrq_alt;
/*
+ * Notifier list for console keyboard events
+ */
+static ATOMIC_NOTIFIER_HEAD(keyboard_notifier_list);
+
+int register_keyboard_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&keyboard_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_keyboard_notifier);
+
+int unregister_keyboard_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&keyboard_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_keyboard_notifier);
+
+/*
* Translation of scancodes to keycodes. We set them on only the first
* keyboard in the list that accepts the scancode and keycode.
* Explanation for not choosing the first attached keyboard anymore:
@@ -1130,6 +1149,7 @@ static void kbd_keycode(unsigned int keycode, int down,
int hw_raw)
unsigned char type, raw_mode;
struct tty_struct *tty;
int shift_final;
+ struct keyboard_notifier_param param = { .vc = vc, .value = keycode,
.down = down };
tty = vc->vc_tty;
@@ -1217,10 +1237,11 @@ static void kbd_keycode(unsigned int keycode, int down,
int hw_raw)
return;
}
- shift_final = (shift_state | kbd->slockstate) ^ kbd->lockstate;
+ param.shift = shift_final = (shift_state | kbd->slockstate) ^
kbd->lockstate;
key_map = key_maps[shift_final];
- if (!key_map) {
+ if (atomic_notifier_call_chain(&keyboard_notifier_list, KBD_KEYCODE,
¶m) == NOTIFY_STOP || !key_map) {
+ atomic_notifier_call_chain(&keyboard_notifier_list,
KBD_UNBOUND_KEYCODE, ¶m);
compute_shiftstate();
kbd->slockstate = 0;
return;
@@ -1237,6 +1258,9 @@ static void kbd_keycode(unsigned int keycode, int down,
int hw_raw)
type = KTYP(keysym);
if (type < 0xf0) {
+ param.value = keysym;
+ if (atomic_notifier_call_chain(&keyboard_notifier_list,
KBD_UNICODE, ¶m) == NOTIFY_STOP)
+ return;
if (down && !raw_mode)
to_utf8(vc, keysym);
return;
@@ -1244,9 +1268,6 @@ static void kbd_keycode(unsigned int keycode, int down,
int hw_raw)
type -= 0xf0;
- if (raw_mode && type != KT_SPEC && type != KT_SHIFT)
- return;
-
if (type == KT_LETTER) {
type = KT_LATIN;
if (vc_kbd_led(kbd, VC_CAPSLOCK)) {
@@ -1255,9 +1276,18 @@ static void kbd_keycode(unsigned int keycode, int down,
int hw_raw)
keysym = key_map[keycode];
}
}
+ param.value = keysym;
+
+ if (atomic_notifier_call_chain(&keyboard_notifier_list, KBD_KEYSYM,
¶m) == NOTIFY_STOP)
+ return;
+
+ if (raw_mode && type != KT_SPEC && type != KT_SHIFT)
+ return;
(*k_handler[type])(vc, keysym & 0xff, !down);
+ atomic_notifier_call_chain(&keyboard_notifier_list, KBD_POST_KEYSYM,
¶m);
+
if (type != KT_SLOCK)
kbd->slockstate = 0;
}
diff --git a/include/linux/keyboard.h b/include/linux/keyboard.h
index 33b5c2e..65c2d70 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 fad7ff1..bd37880 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 */
-
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