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leds: save the delay values after a successful call to blink_set()

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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@studenti.unina.it>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: <stable@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Antonio Ospite 2011-10-31 17:12:19 -07:00 committed by Linus Torvalds
parent dabc69c242
commit 6123b0e274
1 changed files with 4 additions and 1 deletions
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5
drivers/leds/led-class.c
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@ -268,8 +268,11 @@ 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)