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| author | Meghana Madhyastha <meghana.madhyastha@gmail.com> | 2018-01-24 19:35:30 +0300 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2018-01-29 18:34:53 +0300 |
| commit | c2adda27d202fa8f70a5d6e8b0c12b449c8868b8 (patch) | |
| tree | 4dae2ef4d28ae0b0e73022cae120a78d174f3aca /include/linux/backlight.h | |
| parent | 5b698be0497d8be986e2050e9b1c145b2e0603c2 (diff) | |
| download | linux-c2adda27d202fa8f70a5d6e8b0c12b449c8868b8.tar.xz | |
video: backlight: Add of_find_backlight helper in backlight.c
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 <daniel.thompson@linaro.org>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Meghana Madhyastha <meghana.madhyastha@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/116d160ba78be2e6dcbdcb6855622bce67da9472.1516810725.git.meghana.madhyastha@gmail.com
Diffstat (limited to 'include/linux/backlight.h')
| -rw-r--r-- | include/linux/backlight.h | 19 |
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 |