[PATCH] ide: enable LED support for PowerMac

From Benjamin Herrenschmidt <benh@kernel.crashing.org>:

This adds the Kconfig option for the PowerMac IDE driver "LED" feature
(using the laptop's front LED as a disk activity indicator).  It also
adds a small bit to ide-probe.c that was missing from Jens patch when he
added the activity function infrastructure.  He did add the hwif field,
but not the code to actually enable it.

drivers/ide/Kconfig

@@ -835,6 +835,13 @@ config BLK_DEV_IDEDMA_PMAC
 	  to transfer data to and from memory.  Saying Y is safe and improves
 	  performance.
 
+config BLK_DEV_IDE_PMAC_BLINK
+	bool "Blink laptop LED on drive activity"
+	depends on BLK_DEV_IDE_PMAC && ADB_PMU
+	help
+	  This option enables the use of the sleep LED as a hard drive
+	  activity LED.
+
 config BLK_DEV_IDEDMA_PMAC_AUTO
 	bool "Use DMA by default"
 	depends on BLK_DEV_IDEDMA_PMAC

drivers/ide/ide-probe.c

@@ -958,6 +958,10 @@ static int ide_init_queue(ide_drive_t *drive)
 	/* needs drive->queue to be set */
 	ide_toggle_bounce(drive, 1);
 
+	/* enable led activity for disk drives only */
+	if (drive->media == ide_disk && hwif->led_act)
+		blk_queue_activity_fn(q, hwif->led_act, drive);
+
 	return 0;
 }