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>

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;