summaryrefslogtreecommitdiff
path: root/drivers/leds/led-core.c
diff options
context:
space:
mode:
authorJacek Anaszewski <j.anaszewski@samsung.com>2014-08-20 17:41:55 +0400
committerBryan Wu <cooloney@gmail.com>2014-09-13 01:01:54 +0400
commit3ef7de5304edf60d0b8674dd7cdacc104e15a93c (patch)
tree2af483fbfc67853ce5c8b3772fadb93c872b0d35 /drivers/leds/led-core.c
parent914ae25a62e77ebbfa0ce7cbc60edd01cc4d1d31 (diff)
downloadlinux-3ef7de5304edf60d0b8674dd7cdacc104e15a93c.tar.xz
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.c16
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);