diff options
Diffstat (limited to 'include/linux/backlight.h')
-rw-r--r-- | include/linux/backlight.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/include/linux/backlight.h b/include/linux/backlight.h index af7003548593..2baab6f3861d 100644 --- a/include/linux/backlight.h +++ b/include/linux/backlight.h @@ -130,6 +130,48 @@ static inline int backlight_update_status(struct backlight_device *bd) return ret; } +/** + * backlight_enable - Enable backlight + * @bd: the backlight device to enable + */ +static inline int backlight_enable(struct backlight_device *bd) +{ + if (!bd) + return 0; + + bd->props.power = FB_BLANK_UNBLANK; + bd->props.fb_blank = FB_BLANK_UNBLANK; + bd->props.state &= ~BL_CORE_FBBLANK; + + return backlight_update_status(bd); +} + +/** + * backlight_disable - Disable backlight + * @bd: the backlight device to disable + */ +static inline int backlight_disable(struct backlight_device *bd) +{ + if (!bd) + return 0; + + bd->props.power = FB_BLANK_POWERDOWN; + bd->props.fb_blank = FB_BLANK_POWERDOWN; + bd->props.state |= BL_CORE_FBBLANK; + + 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); @@ -173,4 +215,20 @@ 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); +struct backlight_device *devm_of_find_backlight(struct device *dev); +#else +static inline struct backlight_device *of_find_backlight(struct device *dev) +{ + return NULL; +} + +static inline struct backlight_device * +devm_of_find_backlight(struct device *dev) +{ + return NULL; +} +#endif + #endif |