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authorJacek Anaszewski <j.anaszewski@samsung.com>2014-11-14 13:50:18 +0300
committerBryan Wu <cooloney@gmail.com>2014-11-15 01:29:35 +0300
commit4d71a4a12b130ad033219e6f58c74a64059415eb (patch)
tree5b9560719835c5a204b92f4bb7e44aae6793281c /drivers/leds/leds.h
parentacd899e4f3066b6662f6047da5b795cc762093cb (diff)
downloadlinux-4d71a4a12b130ad033219e6f58c74a64059415eb.tar.xz
leds: Add support for setting brightness in a synchronous way
There are use cases when setting a LED brightness has to have immediate effect (e.g. setting a torch LED brightness). This patch extends LED subsystem to support such operations. The LED subsystem internal API __led_set_brightness is changed to led_set_brightness_async and new led_set_brightness_sync API is added. 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/leds.h')
-rw-r--r--drivers/leds/leds.h20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/leds/leds.h b/drivers/leds/leds.h
index 4c50365344a9..2348dbda5269 100644
--- a/drivers/leds/leds.h
+++ b/drivers/leds/leds.h
@@ -17,16 +17,28 @@
#include <linux/rwsem.h>
#include <linux/leds.h>
-static inline void __led_set_brightness(struct led_classdev *led_cdev,
+static inline void led_set_brightness_async(struct led_classdev *led_cdev,
enum led_brightness value)
{
- if (value > led_cdev->max_brightness)
- value = led_cdev->max_brightness;
- led_cdev->brightness = value;
+ led_cdev->brightness = min(value, led_cdev->max_brightness);
+
if (!(led_cdev->flags & LED_SUSPENDED))
led_cdev->brightness_set(led_cdev, value);
}
+static inline int led_set_brightness_sync(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ int ret = 0;
+
+ led_cdev->brightness = min(value, led_cdev->max_brightness);
+
+ if (!(led_cdev->flags & LED_SUSPENDED))
+ ret = led_cdev->brightness_set_sync(led_cdev,
+ led_cdev->brightness);
+ return ret;
+}
+
static inline int led_get_brightness(struct led_classdev *led_cdev)
{
return led_cdev->brightness;