Blank now key

[Pavel Machek]

Hi!

This is must-have for machines where backlight eats significant
ammount of power. Please apply,
							Pavel

Index: linux/drivers/char/keyboard.c
===================================================================
--- linux.orig/drivers/char/keyboard.c	2003-03-27 11:10:04.000000000 +0100
+++ linux/drivers/char/keyboard.c	2003-03-16 18:51:05.000000000 +0100
@@ -20,6 +20,7 @@
  * parts by Geert Uytterhoeven, May 1997
  *
  * 27-05-97: Added support for the Magic SysRq Key (Martin Mares)
+ * 29-07-97: Added blank console key (Pavel Machek)
  * 30-07-98: Dead keys redone, [e-mail].
  * 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
  */
@@ -86,7 +87,8 @@
 	fn_show_state,	fn_send_intr, 	fn_lastcons, 	fn_caps_toggle,\
 	fn_num,		fn_hold, 	fn_scroll_forw,	fn_scroll_back,\
 	fn_boot_it, 	fn_caps_on, 	fn_compose,	fn_SAK,\
-	fn_dec_console, fn_inc_console, fn_spawn_con, 	fn_bare_num
+	fn_dec_console, fn_inc_console, fn_spawn_con, 	fn_bare_num, \
+	fn_blank_now
 
 typedef void (fn_handler_fn)(struct vc_data *vc, struct pt_regs *regs);
 static fn_handler_fn FN_HANDLERS;
@@ -320,6 +322,25 @@
 	con_schedule_flip(tty);
 }
 
+static void blank_now_do(unsigned long unused)
+{
+	do_poke_blanked_console = 0;
+	do_blank_screen(0);
+}
+
+static struct timer_list blank_now_timer;
+
+static void fn_blank_now(struct vc_data *vc, struct pt_regs *regs)
+{
+	/* You ask why we have our own timer here? Well, it is because
+           we do not want user's release of keys to unblank
+           immediately. Even if we correctly guessed what is press and
+           what is release, thinkpad's broken bios will turn on
+           backlight for us... <[e-mail]> */
+	blank_now_timer.expires = jiffies + HZ;
+	add_timer(&blank_now_timer);
+}
+
 static void applkey(struct vc_data *vc, int key, char mode)
 {
 	static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
@@ -1215,6 +1258,9 @@
 {
 	int i;
 
+	init_timer(&blank_now_timer);
+	blank_now_timer.function = blank_now_do;
+
         kbd0.ledflagstate = kbd0.default_ledflagstate = KBD_DEFLEDS;
         kbd0.ledmode = LED_SHOW_FLAGS;
         kbd0.lockstate = KBD_DEFLOCK;

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]