1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index ace825e2ca2d..ddc9bade4fb2 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -162,6 +162,16 @@ static inline int backlight_disable(struct backlight_device *bd)
         return backlight_update_status(bd);
 }
 
+/**
+ * backlight_put - Drop backlight reference
+ * @bd: the backlight device to put
+ */
+static inline void backlight_put(struct backlight_device *bd)
+{
+        if (bd)
+                put_device(&bd->dev);
+}
+
 extern struct backlight_device *backlight_device_register(const char *name,
         struct device *dev, void *devdata, const struct backlight_ops *ops,
         const struct backlight_properties *props);
@@ -205,4 +215,13 @@ of_find_backlight_by_node(struct device_node *node)
 }
 #endif
 
+#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
+struct backlight_device *of_find_backlight(struct device *dev);
+#else
+static inline struct backlight_device *of_find_backlight(struct device *dev)
+{
+        return NULL;
+}
+#endif
+
 #endif