diff options
| author | Meghana Madhyastha <meghana.madhyastha@gmail.com> | 2018-01-24 16:37:23 +0000 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2018-01-29 10:34:53 -0500 |
| commit | 2e4ef3347b4a4eb65c4fd950d94bbd75fed4d798 (patch) | |
| tree | 8288bb24e81e40104fa471aa51e4ea59d4267827 | |
| parent | c2adda27d202fa8f70a5d6e8b0c12b449c8868b8 (diff) | |
video: backlight: Add devres versions of of_find_backlighttopic/backlight_for_lag-2018-01-29
Add devm_of_find_backlight and the corresponding release
function because some drivers use devres versions of functions
for acquiring device resources.
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Meghana Madhyastha <meghana.madhyastha@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/021f8fecfa3f374dc5dcb70fb07a6f6b019bea7b.1516810725.git.meghana.madhyastha@gmail.com
| -rw-r--r-- | drivers/video/backlight/backlight.c | 30 | ||||
| -rw-r--r-- | include/linux/backlight.h | 7 |
2 files changed, 37 insertions, 0 deletions
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index 553bf5c4807c..deb824bef6e2 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -623,6 +623,36 @@ struct backlight_device *of_find_backlight(struct device *dev) } EXPORT_SYMBOL(of_find_backlight); +static void devm_backlight_release(void *data) +{ + backlight_put(data); +} + +/** + * devm_of_find_backlight - Resource-managed of_find_backlight() + * @dev: Device + * + * Device managed version of of_find_backlight(). + * The reference on the backlight device is automatically + * dropped on driver detach. + */ +struct backlight_device *devm_of_find_backlight(struct device *dev) +{ + struct backlight_device *bd; + int ret; + + bd = of_find_backlight(dev); + if (IS_ERR_OR_NULL(bd)) + return bd; + ret = devm_add_action(dev, devm_backlight_release, bd); + if (ret) { + backlight_put(bd); + return ERR_PTR(ret); + } + return bd; +} +EXPORT_SYMBOL(devm_of_find_backlight); + static void __exit backlight_class_exit(void) { class_destroy(backlight_class); diff --git a/include/linux/backlight.h b/include/linux/backlight.h index ddc9bade4fb2..2baab6f3861d 100644 --- a/include/linux/backlight.h +++ b/include/linux/backlight.h @@ -217,11 +217,18 @@ of_find_backlight_by_node(struct device_node *node) #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 |