Merge tag 'renesas-boards-cleanups2-for-v3.19' of git://git.kernel.org/pub/scm/linux...

[firefly-linux-kernel-4.4.55.git] / drivers / leds / led-core.c

diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 71b40d3bf77604e32829f391b6e804bbeefb0cf1..aaa8eba9099f4cf1932bae96a4081cc273214876 100644 (file)
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -12,10 +12,11 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/leds.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/rwsem.h>
-#include <linux/leds.h>
 #include "leds.h"
 
 DECLARE_RWSEM(leds_list_lock);
@@ -126,3 +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);