leds: convert IDE trigger to common disk trigger

This patch converts the IDE specific LED trigger to a generic disk
activity LED trigger. The libata core is now a trigger source just
like before the IDE disk driver. It's merely a replacement of the
string ide by disk.

The patch is taken from http://dev.gentoo.org/~josejx/ata.patch and is
widely used by any ibook/powerbook owners with great satisfaction.
Likewise, it is very often used successfully on different ARM platforms.

Unlike the original patch, the existing 'ide-disk' trigger is still
available for backward compatibility. That reduce the amount of patches
in affected device trees out of the mainline kernel. For further
development, the new name 'disk-activity' should be used.

Cc: Joseph Jezak <josejx@gentoo.org>
Cc: Jörg Sommer <joerg@alea.gnuu.de>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Stephan Linz <linz@li-pro.net>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>

drivers/leds/trigger/Kconfig

@@ -33,12 +33,12 @@ config LEDS_TRIGGER_ONESHOT
 
 	  If unsure, say Y.
 
-config LEDS_TRIGGER_IDE_DISK
-	bool "LED IDE Disk Trigger"
-	depends on IDE_GD_ATA
+config LEDS_TRIGGER_DISK
+	bool "LED Disk Trigger"
+	depends on IDE_GD_ATA || ATA
 	depends on LEDS_TRIGGERS
 	help
-	  This allows LEDs to be controlled by IDE disk activity.
+	  This allows LEDs to be controlled by disk activity.
 	  If unsure, say Y.
 
 config LEDS_TRIGGER_MTD

drivers/leds/trigger/Makefile

@@ -1,6 +1,6 @@
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o
 obj-$(CONFIG_LEDS_TRIGGER_ONESHOT)	+= ledtrig-oneshot.o
-obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK)	+= ledtrig-ide-disk.o
+obj-$(CONFIG_LEDS_TRIGGER_DISK)		+= ledtrig-disk.o
 obj-$(CONFIG_LEDS_TRIGGER_MTD)		+= ledtrig-mtd.o
 obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT)	+= ledtrig-heartbeat.o
 obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT)	+= ledtrig-backlight.o

drivers/leds/trigger/ledtrig-disk.c

@@ -1,5 +1,5 @@
 /*
- * LED IDE-Disk Activity Trigger
+ * LED Disk Activity Trigger
  *
  * Copyright 2006 Openedhand Ltd.
  *
@@ -17,20 +17,25 @@
 
 #define BLINK_DELAY 30
 
+DEFINE_LED_TRIGGER(ledtrig_disk);
 DEFINE_LED_TRIGGER(ledtrig_ide);
 
-void ledtrig_ide_activity(void)
+void ledtrig_disk_activity(void)
 {
-	unsigned long ide_blink_delay = BLINK_DELAY;
+	unsigned long blink_delay = BLINK_DELAY;
 
+	led_trigger_blink_oneshot(ledtrig_disk,
+				  &blink_delay, &blink_delay, 0);
 	led_trigger_blink_oneshot(ledtrig_ide,
-				  &ide_blink_delay, &ide_blink_delay, 0);
+				  &blink_delay, &blink_delay, 0);
 }
-EXPORT_SYMBOL(ledtrig_ide_activity);
+EXPORT_SYMBOL(ledtrig_disk_activity);
 
-static int __init ledtrig_ide_init(void)
+static int __init ledtrig_disk_init(void)
 {
+	led_trigger_register_simple("disk-activity", &ledtrig_disk);
 	led_trigger_register_simple("ide-disk", &ledtrig_ide);
+
 	return 0;
 }
-device_initcall(ledtrig_ide_init);
+device_initcall(ledtrig_disk_init);