Patch for initial CapsLock

Patch for initial CapsLock

[Pete Zaitcev]

Hi, Vojtech:

In 2.4.21-pre2, if Caps Lock is on and a USB keyboard is connected,
the LED will not be lit. It mostly affects KVM users like those
of IBM BladeCenter, because they "connect" keyboards all day long.
Would you be so kind to review the attached patch?

-- Pete

diff -ur -X dontdiff linux-2.4.21-pre2/drivers/char/keyboard.c linux-2.4.21-pre2-usb/drivers/char/keyboard.c
--- linux-2.4.21-pre2/drivers/char/keyboard.c	2002-08-02 17:39:43.000000000 -0700
+++ linux-2.4.21-pre2-usb/drivers/char/keyboard.c	2002-12-24 10:40:48.000000000 -0800
@@ -64,6 +64,7 @@
 void (*kbd_ledfunc)(unsigned int led);
 EXPORT_SYMBOL(handle_scancode);
 EXPORT_SYMBOL(kbd_ledfunc);
+EXPORT_SYMBOL(kbd_refresh_leds);
 
 extern void ctrl_alt_del(void);
 
@@ -899,9 +900,9 @@
  * Aside from timing (which isn't really that important for
  * keyboard interrupts as they happen often), using the software
  * interrupt routines for this thing allows us to easily mask
- * this when we don't want any of the above to happen. Not yet
- * used, but this allows for easy and efficient race-condition
- * prevention later on.
+ * this when we don't want any of the above to happen.
+ * This allows for easy and efficient race-condition prevention
+ * for kbd_ledfunc => input_event(dev, EV_LED, ...) => ...
  */
 static void kbd_bh(unsigned long dummy)
 {
@@ -917,6 +918,18 @@
 EXPORT_SYMBOL(keyboard_tasklet);
 DECLARE_TASKLET_DISABLED(keyboard_tasklet, kbd_bh, 0);
 
+/*
+ * This allows a newly plugged keyboard to pick the LED state.
+ * We do it in this seemindly backwards fashion to ensure proper locking.
+ * Built-in keyboard does refresh on its own.
+ */
+void kbd_refresh_leds(void)
+{
+	tasklet_disable(&keyboard_tasklet);
+	if (ledstate != 0xff && kbd_ledfunc != NULL) kbd_ledfunc(ledstate);
+	tasklet_enable(&keyboard_tasklet);
+}
+
 typedef void (pm_kbd_func) (void);
 
 pm_callback pm_kbd_request_override = NULL;
diff -ur -X dontdiff linux-2.4.21-pre2/drivers/input/keybdev.c linux-2.4.21-pre2-usb/drivers/input/keybdev.c
--- linux-2.4.21-pre2/drivers/input/keybdev.c	2001-10-11 09:14:32.000000000 -0700
+++ linux-2.4.21-pre2-usb/drivers/input/keybdev.c	2002-12-23 23:43:53.000000000 -0800
@@ -201,6 +201,7 @@
 	input_open_device(handle);
 
 //	printk(KERN_INFO "keybdev.c: Adding keyboard: input%d\n", dev->number);
+	kbd_refresh_leds();
 
 	return handle;
 }
@@ -222,6 +223,7 @@
 {
 	input_register_handler(&keybdev_handler);
 	kbd_ledfunc = keybdev_ledfunc;
+	kbd_refresh_leds();
 
 	if (jp_kbd_109) {
 		x86_keycodes[0xb5] = 0x73;	/* backslash, underscore */
diff -ur -X dontdiff linux-2.4.21-pre2/include/linux/kbd_kern.h linux-2.4.21-pre2-usb/include/linux/kbd_kern.h
--- linux-2.4.21-pre2/include/linux/kbd_kern.h	2002-12-19 20:22:19.000000000 -0800
+++ linux-2.4.21-pre2-usb/include/linux/kbd_kern.h	2002-12-23 23:43:31.000000000 -0800
@@ -72,6 +72,7 @@
 extern int do_poke_blanked_console;
 
 extern void (*kbd_ledfunc)(unsigned int led);
+extern void kbd_refresh_leds(void);
 
 extern void set_console(int nr);
 extern void schedule_console_callback(void);