[PATCH] LED: add NAND MTD activity LED trigger

Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/mtd/nand/nand_base.c

@@ -80,6 +80,7 @@
 #include <linux/mtd/compatmac.h>
 #include <linux/interrupt.h>
 #include <linux/bitops.h>
+#include <linux/leds.h>
 #include <asm/io.h>
 
 #ifdef CONFIG_MTD_PARTITIONS
@@ -515,6 +516,8 @@ static int nand_block_checkbad (struct mtd_info *mtd, loff_t ofs, int getchip, i
 	return nand_isbad_bbt (mtd, ofs, allowbbt);
 }
 
+DEFINE_LED_TRIGGER(nand_led_trigger);
+
 /*
  * Wait for the ready pin, after a command
  * The timeout is catched later.
@@ -524,12 +527,14 @@ static void nand_wait_ready(struct mtd_info *mtd)
 	struct nand_chip *this = mtd->priv;
 	unsigned long	timeo = jiffies + 2;
 
+	led_trigger_event(nand_led_trigger, LED_FULL);
 	/* wait until command is processed or timeout occures */
 	do {
 		if (this->dev_ready(mtd))
-			return;
+			break;
 		touch_softlockup_watchdog();
 	} while (time_before(jiffies, timeo));
+	led_trigger_event(nand_led_trigger, LED_OFF);
 }
 
 /**
@@ -817,6 +822,8 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *this, int state)
 	else
 		 timeo += (HZ * 20) / 1000;
 
+	led_trigger_event(nand_led_trigger, LED_FULL);
+
 	/* Apply this short delay always to ensure that we do wait tWB in
 	 * any case on any machine. */
 	ndelay (100);
@@ -840,6 +847,8 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *this, int state)
 		}
 		cond_resched();
 	}
+	led_trigger_event(nand_led_trigger, LED_OFF);
+
 	status = (int) this->read_byte(mtd);
 	return status;
 }
@@ -2724,6 +2733,21 @@ void nand_release (struct mtd_info *mtd)
 EXPORT_SYMBOL_GPL (nand_scan);
 EXPORT_SYMBOL_GPL (nand_release);
 
+
+static int __init nand_base_init(void)
+{
+	led_trigger_register_simple("nand-disk", &nand_led_trigger);
+	return 0;
+}
+
+static void __exit nand_base_exit(void)
+{
+	led_trigger_unregister_simple(nand_led_trigger);
+}
+
+module_init(nand_base_init);
+module_exit(nand_base_exit);
+
 MODULE_LICENSE ("GPL");
 MODULE_AUTHOR ("Steven J. Hill <sjhill@realitydiluted.com>, Thomas Gleixner <tglx@linutronix.de>");
 MODULE_DESCRIPTION ("Generic NAND flash driver code");