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leds: fix brightness changing when software blinking is active

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The following sequence:
echo timer >/sys/class/leds/<name>/trigger
echo 1 >/sys/class/leds/<name>/brightness
should change the ON brightness for blinking.
The function led_set_brightness() was mistakenly initiating the
delayed blink stop procedure, which resulted in no blinking with
the timer trigger still active.

This patch fixes the problem by changing led_set_brightness()
to not initiate the delayed blink stop when brightness is not 0.

CC: Richard Purdie <rpurdie@rpsys.net>
CC: Kyungmin Park <kyungmin.park@samsung.com>
CC: linux-leds@vger.kernel.org
CC: linux-kernel@vger.kernel.org

Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Stas Sergeev 2015-05-14 08:24:02 -07:00 committed by Bryan Wu
parent 7ff6b23251
commit 76931edd54
2 changed files with 8 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/leds/led-class.c
View file

@ -121,6 +121,11 @@ static void led_timer_function(unsigned long data)
brightness = led_get_brightness(led_cdev);
if (!brightness) {
/* Time to switch the LED on. */
if (led_cdev->delayed_set_value) {
led_cdev->blink_brightness =
led_cdev->delayed_set_value;
led_cdev->delayed_set_value = 0;
}
brightness = led_cdev->blink_brightness;
delay = led_cdev->blink_delay_on;
} else {

5
drivers/leds/led-core.c
View file

@ -119,10 +119,11 @@ void led_set_brightness(struct led_classdev *led_cdev,
{
int ret = 0;
/* delay brightness setting if need to stop soft-blink timer */
/* delay brightness if soft-blink is active */
if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
led_cdev->delayed_set_value = brightness;
schedule_work(&led_cdev->set_brightness_work);
if (brightness == LED_OFF)
schedule_work(&led_cdev->set_brightness_work);
return;
}