[PATCH] Default keyboard LEDs

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

In many cases, one prefers to have e.g. the NumLock on by default.  In
many cases, one doesn't want to have it by default, e.g. on laptops.

Distributions actually have a very hard time trying to set this
correctly after the kernel boot, and that doesn't work for new consoles
that are created via the openvt(1) command anyway. This hence adds a
keyboard.default_leds boot parameter that permits to configure the
default keyboard LEDs.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

---

Actually, what would be perfect would be to use the configuration that
the BIOS sets at boot by default.  That is device-dependent, however.

--- linux/drivers/char/keyboard.c.orig	2008-01-14 00:26:12.000000000 +0000
+++ linux/drivers/char/keyboard.c	2008-01-14 00:33:03.000000000 +0000
@@ -67,6 +67,9 @@
 
 #define KBD_DEFLOCK 0
 
+unsigned char default_leds = KBD_DEFLEDS;
+module_param(default_leds, byte, S_IRUGO | S_IWUSR);
+
 void compute_shiftstate(void);
 
 /*
@@ -1405,8 +1408,8 @@
 	int error;
 
         for (i = 0; i < MAX_NR_CONSOLES; i++) {
-		kbd_table[i].ledflagstate = KBD_DEFLEDS;
-		kbd_table[i].default_ledflagstate = KBD_DEFLEDS;
+		kbd_table[i].ledflagstate = default_leds;
+		kbd_table[i].default_ledflagstate = default_leds;
 		kbd_table[i].ledmode = LED_SHOW_FLAGS;
 		kbd_table[i].lockstate = KBD_DEFLOCK;
 		kbd_table[i].slockstate = 0;
--- linux/include/linux/kbd_kern.h.orig	2008-01-14 00:32:36.000000000 +0000
+++ linux/include/linux/kbd_kern.h	2008-01-14 00:32:48.000000000 +0000
@@ -13,6 +13,7 @@
 extern char func_buf[];
 extern char *funcbufptr;
 extern int funcbufsize, funcbufleft;
+extern unsigned char default_leds;
 
 /*
  * kbd->xxx contains the VC-local things (flag settings etc..)
--- linux/Documentation/kernel-parameters.txt.orig	2008-01-14 00:38:40.000000000 +0000
+++ linux/Documentation/kernel-parameters.txt	2008-01-14 00:41:21.000000000 +0000
@@ -550,6 +550,15 @@
 			Set system-wide default UTF-8 mode for all tty's.
 			Default is 0 and by setting to 1, it enables UTF-8
 			mode for all newly opened or allocated terminals.
+	
+	keyboard.default_leds=
+			[KEYBOARD]
+			Format=<ledmask>
+			Mask of the leds to activate on consoles by default.
+			ScrollLock: 1
+			NumLock: 2
+			CapsLock: 4
+			KanaLock: 8
 
 	dhash_entries=	[KNL]
 			Set number of hash buckets for dentry cache.