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Message-ID: <alpine.LSU.0.999.0712301230270.3273@be1.lrz>
Date: Sun, 30 Dec 2007 12:38:11 +0100 (CET)
From: Bodo Eggert <7eggert@....de>
To: linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
torvalds@...ux-foundation.org
Subject: [PATCH] Get NUMLOCK from PC BIOS
This patch enables reading the default NUMLOCK status from the BIOS data
area as defined for IBM PCs (1981). Using this area has been a reliable way
to detect (or set) the NUMLOCK status for about 27 years, and it will
continue to work on any IBM-compatible system that might run DOS.
Especially, the NUMLOCK status on Linus' famous laptop should be usable.
---
I'd like some information about how this patch works non non-IBM-compatible
x86 PCs. For now, I've documented the wordt possible outcome I can imagine.
Signed-Off-By: Bodo Eggert <7eggert@....de>
diff -pruN -X dontdiff linux-2.6.23.pure/drivers/char/keyboard.c linux-2.6.23.base/drivers/char/keyboard.c
--- linux-2.6.23.pure/drivers/char/keyboard.c 2007-10-11 14:15:18.000000000 +0200
+++ linux-2.6.23.base/drivers/char/keyboard.c 2007-12-30 12:12:11.000000000 +0100
@@ -24,6 +24,7 @@
* 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
*/
+#include <asm/io.h>
#include <linux/consolemap.h>
#include <linux/module.h>
#include <linux/sched.h>
@@ -57,7 +58,10 @@ extern void ctrl_alt_del(void);
* to be used for numbers.
*/
-#if defined(CONFIG_PARISC) && (defined(CONFIG_KEYBOARD_HIL) || defined(CONFIG_KEYBOARD_HIL_OLD))
+#ifdef CONFIG_KBD_DEFLEDS_PCBIOS
+/* KBD_DEFLEDS is a variable */
+#undef KBD_DEFLEDS
+#elif defined(CONFIG_PARISC) && (defined(CONFIG_KEYBOARD_HIL) || defined(CONFIG_KEYBOARD_HIL_OLD))
#define KBD_DEFLEDS (1 << VC_NUMLOCK)
#else
#define KBD_DEFLEDS 0
@@ -1358,8 +1362,17 @@ int __init kbd_init(void)
{
int i;
int error;
+#ifdef CONFIG_KBD_DEFLEDS_PCBIOS
+ int KBD_DEFLEDS = 0;
+ /* address 0x40:0x17 */
+ char * bios_kbd_status=xlate_dev_mem_ptr(0x417);
+
+ /* Numlock status bit set? */
+ if (*bios_kbd_status & 0x20)
+ KBD_DEFLEDS = 1 << VC_NUMLOCK;
+#endif
- for (i = 0; i < MAX_NR_CONSOLES; i++) {
+ for (i = 0; i < MAX_NR_CONSOLES; i++) {
kbd_table[i].ledflagstate = KBD_DEFLEDS;
kbd_table[i].default_ledflagstate = KBD_DEFLEDS;
kbd_table[i].ledmode = LED_SHOW_FLAGS;
diff -pruN -X dontdiff linux-2.6.23.pure/drivers/input/keyboard/Kconfig linux-2.6.23.base/drivers/input/keyboard/Kconfig
--- linux-2.6.23.pure/drivers/input/keyboard/Kconfig 2007-10-11 14:14:41.000000000 +0200
+++ linux-2.6.23.base/drivers/input/keyboard/Kconfig 2007-12-30 12:11:45.000000000 +0100
@@ -12,6 +12,17 @@ menuconfig INPUT_KEYBOARD
if INPUT_KEYBOARD
+config KBD_DEFLEDS_PCBIOS
+ bool "Enable Num-Lock based on BIOS settings"
+ depends on X86_PC && EXPERIMENTAL
+ help
+ Turns on Numlock depending on the BIOS settings.
+ This works by reading the BIOS data area as defined for IBM PCs (1981).
+
+ If you have an alternative firmware like OpenFirmware or LinuxBios,
+ this flag might not be set correctly, which results in a random state
+ of the Numlock key.
+
config KEYBOARD_ATKBD
tristate "AT keyboard" if EMBEDDED || !X86_PC
default y
--
Top 100 things you don't want the sysadmin to say:
39. It is only a minor upgrade, the system should be back up in
a few hours. ( This is said on a monday afternoon.)
--
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