diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index bddc8b17a4d8..18901b9b1eb4 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -164,6 +164,30 @@ static ssize_t brightness_show(struct device *dev,
 	return sprintf(buf, "%d\n", bd->props.brightness);
 }
 
+int backlight_device_set_brightness(struct backlight_device *bd,
+				    unsigned long brightness)
+{
+	int rc = -ENXIO;
+
+	mutex_lock(&bd->ops_lock);
+	if (bd->ops) {
+		if (brightness > bd->props.max_brightness)
+			rc = -EINVAL;
+		else {
+			pr_debug("set brightness to %lu\n", brightness);
+			bd->props.brightness = brightness;
+			backlight_update_status(bd);
+			rc = 0;
+		}
+	}
+	mutex_unlock(&bd->ops_lock);
+
+	backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS);
+
+	return rc;
+}
+EXPORT_SYMBOL(backlight_device_set_brightness);
+
 static ssize_t brightness_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
@@ -175,24 +199,9 @@ static ssize_t brightness_store(struct device *dev,
 	if (rc)
 		return rc;
 
-	rc = -ENXIO;
+	rc = backlight_device_set_brightness(bd, brightness);
 
-	mutex_lock(&bd->ops_lock);
-	if (bd->ops) {
-		if (brightness > bd->props.max_brightness)
-			rc = -EINVAL;
-		else {
-			pr_debug("set brightness to %lu\n", brightness);
-			bd->props.brightness = brightness;
-			backlight_update_status(bd);
-			rc = count;
-		}
-	}
-	mutex_unlock(&bd->ops_lock);
-
-	backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS);
-
-	return rc;
+	return rc ? rc : count;
 }
 static DEVICE_ATTR_RW(brightness);
 
@@ -380,7 +389,7 @@ struct backlight_device *backlight_device_register(const char *name,
 }
 EXPORT_SYMBOL(backlight_device_register);
 
-bool backlight_device_registered(enum backlight_type type)
+struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
 {
 	bool found = false;
 	struct backlight_device *bd;
@@ -394,7 +403,13 @@ bool backlight_device_registered(enum backlight_type type)
 	}
 	mutex_unlock(&backlight_dev_list_mutex);
 
-	return found;
+	return found ? bd : NULL;
+}
+EXPORT_SYMBOL(backlight_device_get_by_type);
+
+bool backlight_device_registered(enum backlight_type type)
+{
+	return backlight_device_get_by_type(type) ? true : false;
 }
 EXPORT_SYMBOL(backlight_device_registered);
 
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 1e7a69adbe6f..f46b88fa4a09 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -144,6 +144,8 @@ extern void backlight_force_update(struct backlight_device *bd,
 extern bool backlight_device_registered(enum backlight_type type);
 extern int backlight_register_notifier(struct notifier_block *nb);
 extern int backlight_unregister_notifier(struct notifier_block *nb);
+extern struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
+extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned long brightness);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)