From: Richard Purdie <rpurdie@rpsys.net>

Add an LED trigger for IDE disk activity to the ide-disk driver.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Index: linux-2.6.15/drivers/ide/ide-disk.c
===================================================================
--- linux-2.6.15.orig/drivers/ide/ide-disk.c	2006-03-04 18:04:35.000000000 +0000
+++ linux-2.6.15/drivers/ide/ide-disk.c	2006-03-04 18:05:59.000000000 +0000
@@ -60,6 +60,7 @@
 #include <linux/genhd.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/leds.h>
 
 #define _IDE_DISK
 
@@ -80,6 +81,8 @@
 
 static DECLARE_MUTEX(idedisk_ref_sem);
 
+DEFINE_LED_TRIGGER(ide_led_trigger);
+
 #define to_ide_disk(obj) container_of(obj, struct ide_disk_obj, kref)
 
 #define ide_disk_g(disk) \
@@ -297,6 +300,13 @@
 	}
 }
 
+static int ide_end_rw_disk(ide_drive_t *drive, int uptodate, int nr_sectors)
+{
+	if (blk_fs_request(HWGROUP(drive)->rq))
+		led_trigger_event(ide_led_trigger, LED_OFF);
+	return ide_end_request(drive, uptodate, nr_sectors);
+}
+
 /*
  * 268435455  == 137439 MB or 28bit limit
  * 320173056  == 163929 MB or 48bit addressing
@@ -311,10 +321,12 @@
 
 	if (!blk_fs_request(rq)) {
 		blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command");
-		ide_end_request(drive, 0, 0);
+		ide_end_rw_disk(drive, 0, 0);
 		return ide_stopped;
 	}
 
+	led_trigger_event(ide_led_trigger, LED_FULL);
+
 	pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
 		 drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
 		 block, rq->nr_sectors, (unsigned long)rq->buffer);
@@ -1097,7 +1109,7 @@
 	.media			= ide_disk,
 	.supports_dsc_overlap	= 0,
 	.do_request		= ide_do_rw_disk,
-	.end_request		= ide_end_request,
+	.end_request		= ide_end_rw_disk,
 	.error			= __ide_error,
 	.abort			= __ide_abort,
 	.proc			= idedisk_proc,
@@ -1259,12 +1271,16 @@
 
 static void __exit idedisk_exit (void)
 {
+	led_trigger_unregister_simple(ide_led_trigger);
 	driver_unregister(&idedisk_driver.gen_driver);
 }
 
 static int __init idedisk_init(void)
 {
-	return driver_register(&idedisk_driver.gen_driver);
+	int ret = driver_register(&idedisk_driver.gen_driver);
+	if (ret >= 0)
+		led_trigger_register_simple("ide-disk", &ide_led_trigger);
+	return ret;
 }
 
 module_init(idedisk_init);