From c2adda27d202fa8f70a5d6e8b0c12b449c8868b8 Mon Sep 17 00:00:00 2001 From: Meghana Madhyastha Date: Wed, 24 Jan 2018 16:35:30 +0000 Subject: video: backlight: Add of_find_backlight helper in backlight.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add of_find_backlight, a helper function which is a generic version of tinydrm_of_find_backlight that can be used by other drivers to avoid repetition of code and simplify things. Acked-by: Daniel Thompson Reviewed-by: Noralf Trønnes Reviewed-by: Sean Paul Reviewed-by: Thierry Reding Signed-off-by: Meghana Madhyastha Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/116d160ba78be2e6dcbdcb6855622bce67da9472.1516810725.git.meghana.madhyastha@gmail.com --- include/linux/backlight.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'include/linux') 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 -- cgit