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video: backlight: Add of_find_backlight helper in backlight.c

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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
This commit is contained in:
Meghana Madhyastha
2018-01-24 16:35:30 +00:00
committed by Sean Paul
parent 5b698be049
commit c2adda27d2
2 changed files with 62 additions and 0 deletions
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19
include/linux/backlight.h
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@@ -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