diff options
| author |   Jacek Anaszewski <j.anaszewski@samsung.com> | 2014-08-20 06:41:55 -0700 |
|---|---|---|
| committer |   Bryan Wu <cooloney@gmail.com> | 2014-09-12 14:01:54 -0700 |
| commit | 3ef7de5304edf60d0b8674dd7cdacc104e15a93c (patch) | |
| tree | 2af483fbfc67853ce5c8b3772fadb93c872b0d35 /drivers/leds/led-core.c | |
| parent | leds: trigger: gpio: fix warning in gpio trigger for gpios whose accessor function may sleep (diff) | |
| download | linux-dev-3ef7de5304edf60d0b8674dd7cdacc104e15a93c.tar.xz linux-dev-3ef7de5304edf60d0b8674dd7cdacc104e15a93c.zip | |
leds: Improve and export led_update_brightness
led_update_brightness helper function used to be exploited only locally
in the led-class.c module, where its result was being passed to the
brightness_show sysfs callback. With the introduction of v4l2-flash
subdevice the same functionality becomes required for reading current
brightness from a LED device. This patch adds checking of return value
of the brightness_get callback and moves the led_update_brightness()
function to the LED subsystem public API.
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds/led-core.c')
| -rw-r--r-- | drivers/leds/led-core.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c index 50b579ad948e..aaa8eba9099f 100644 --- a/drivers/leds/led-core.c +++ b/drivers/leds/led-core.c @@ -127,3 +127,19 @@ void led_set_brightness(struct led_classdev *led_cdev, __led_set_brightness(led_cdev, brightness); } EXPORT_SYMBOL(led_set_brightness); + +int led_update_brightness(struct led_classdev *led_cdev) +{ + int ret = 0; + + if (led_cdev->brightness_get) { + ret = led_cdev->brightness_get(led_cdev); + if (ret >= 0) { + led_cdev->brightness = ret; + return 0; + } + } + + return ret; +} +EXPORT_SYMBOL(led_update_brightness); |