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authorLinus Torvalds <torvalds@linux-foundation.org>2008-03-18 07:46:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-03-18 07:46:19 -0700
commitfb00f7629bb94ef9189fc3790b95306a144f58c5 (patch)
tree6e73455e0538e3ff6e3303460ab1c7bb9bab1c3e /Documentation
parent992ab12ac390a8b98b45d03f617481e6265811c0 (diff)
parent3c00bb96497a9c1251359a1faf68dddbb8d50a23 (diff)
downloadlinux-fb00f7629bb94ef9189fc3790b95306a144f58c5.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: ALPS - fix forward/back buttons reversed on Acer 5520-5290 Input: ALPS - put secondary device in proper place in sysfs Input: wacom - add support for Bamboo1, BambooFun, and Cintiq 12WX Input: document i8042.noloop Input: add keyboard notifier documentation Input: ads7846 - fix uninitialized var warning Input: i8042 - add SNI RM support Input: i8042 - add Lenovo 3000 N100 to nomux blacklist Input: i8042 - fix warning on non-x86 builds Input: cobalt_btns - assorted fixes
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/input/notifier.txt52
-rw-r--r--Documentation/kernel-parameters.txt2
2 files changed, 54 insertions, 0 deletions
diff --git a/Documentation/input/notifier.txt b/Documentation/input/notifier.txt
new file mode 100644
index 00000000000..95172ca6f3d
--- /dev/null
+++ b/Documentation/input/notifier.txt
@@ -0,0 +1,52 @@
+Keyboard notifier
+
+One can use register_keyboard_notifier to get called back on keyboard
+events (see kbd_keycode() function for details). The passed structure is
+keyboard_notifier_param:
+
+- 'vc' always provide the VC for which the keyboard event applies;
+- 'down' is 1 for a key press event, 0 for a key release;
+- 'shift' is the current modifier state, mask bit indexes are KG_*;
+- 'value' depends on the type of event.
+
+- KBD_KEYCODE events are always sent before other events, value is the keycode.
+- KBD_UNBOUND_KEYCODE events are sent if the keycode is not bound to a keysym.
+ value is the keycode.
+- KBD_UNICODE events are sent if the keycode -> keysym translation produced a
+ unicode character. value is the unicode value.
+- KBD_KEYSYM events are sent if the keycode -> keysym translation produced a
+ non-unicode character. value is the keysym.
+- KBD_POST_KEYSYM events are sent after the treatment of non-unicode keysyms.
+ That permits one to inspect the resulting LEDs for instance.
+
+For each kind of event but the last, the callback may return NOTIFY_STOP in
+order to "eat" the event: the notify loop is stopped and the keyboard event is
+dropped.
+
+In a rough C snippet, we have:
+
+kbd_keycode(keycode) {
+ ...
+ params.value = keycode;
+ if (notifier_call_chain(KBD_KEYCODE,&params) == NOTIFY_STOP)
+ || !bound) {
+ notifier_call_chain(KBD_UNBOUND_KEYCODE,&params);
+ return;
+ }
+
+ if (unicode) {
+ param.value = unicode;
+ if (notifier_call_chain(KBD_UNICODE,&params) == NOTIFY_STOP)
+ return;
+ emit unicode;
+ return;
+ }
+
+ params.value = keysym;
+ if (notifier_call_chain(KBD_KEYSYM,&params) == NOTIFY_STOP)
+ return;
+ apply keysym;
+ notifier_call_chain(KBD_POST_KEYSYM,&params);
+}
+
+NOTE: This notifier is usually called from interrupt context.
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 622f7849edb..650b0d8aa89 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -732,6 +732,8 @@ and is between 256 and 4096 characters. It is defined in the file
(Don't attempt to blink the leds)
i8042.noaux [HW] Don't check for auxiliary (== mouse) port
i8042.nokbd [HW] Don't check/create keyboard port
+ i8042.noloop [HW] Disable the AUX Loopback command while probing
+ for the AUX port
i8042.nomux [HW] Don't check presence of an active multiplexing
controller
i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX