linux-kernel - [PATCH 1/2] leds: save the delay values after a successful call to blink

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Date:	Fri,  7 Oct 2011 00:03:30 +0200
From:	Antonio Ospite <ospite@...denti.unina.it>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	Antonio Ospite <ospite@...denti.unina.it>,
	Johannes Berg <johannes.berg@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] leds: save the delay values after a successful call to blink_set()

When calling the hardware blinking function implemented by blink_set(), 
the delay_on and delay_off values are not preserved across calls.

Fix that and make the "timer" trigger work as expected when hardware 
blinking is available.

BEFORE the fix:
  $ cd /sys/class/leds/someled
  $ echo timer > trigger
  $ cat delay_on delay_off
  0
  0
  $ echo 100 > delay_on
  $ cat delay_on delay_off
  0
  0
  $ echo 100 > delay_off
  $ cat delay_on delay_off
  0
  0

AFTER the fix:
  $ cd /sys/class/leds/someled
  $ echo timer > trigger
  $ cat delay_on delay_off
  0
  0
  $ echo 100 > delay_on
  $ cat delay_on delay_off
  100
  0
  $ echo 100 > delay_off
  $ cat delay_on delay_off
  100
  100

Signed-off-by: Antonio Ospite <ospite@...denti.unina.it>
---
 drivers/leds/led-class.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index d5a4ade..939f24a 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -267,8 +267,11 @@ void led_blink_set(struct led_classdev *led_cdev,
 		   unsigned long *delay_off)
 {
 	if (led_cdev->blink_set &&
-	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
+	    !led_cdev->blink_set(led_cdev, delay_on, delay_off)) {
+		led_cdev->blink_delay_on = *delay_on;
+		led_cdev->blink_delay_off = *delay_off;
 		return;
+	}
 
 	/* blink with 1 Hz as default if nothing specified */
 	if (!*delay_on && !*delay_off)
-- 
1.7.6.3

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