video: backlight: Add devres versions of of_find_backlight
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
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@ -623,6 +623,36 @@ struct backlight_device *of_find_backlight(struct device *dev)
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}
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EXPORT_SYMBOL(of_find_backlight);
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static void devm_backlight_release(void *data)
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{
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backlight_put(data);
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}
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/**
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* devm_of_find_backlight - Resource-managed of_find_backlight()
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* @dev: Device
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*
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* Device managed version of of_find_backlight().
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* The reference on the backlight device is automatically
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* dropped on driver detach.
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*/
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struct backlight_device *devm_of_find_backlight(struct device *dev)
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{
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struct backlight_device *bd;
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int ret;
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bd = of_find_backlight(dev);
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if (IS_ERR_OR_NULL(bd))
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return bd;
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ret = devm_add_action(dev, devm_backlight_release, bd);
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if (ret) {
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backlight_put(bd);
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return ERR_PTR(ret);
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}
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return bd;
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}
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EXPORT_SYMBOL(devm_of_find_backlight);
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static void __exit backlight_class_exit(void)
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{
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class_destroy(backlight_class);
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@ -217,11 +217,18 @@ of_find_backlight_by_node(struct device_node *node)
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#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
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struct backlight_device *of_find_backlight(struct device *dev);
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struct backlight_device *devm_of_find_backlight(struct device *dev);
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#else
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static inline struct backlight_device *of_find_backlight(struct device *dev)
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{
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return NULL;
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}
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static inline struct backlight_device *
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devm_of_find_backlight(struct device *dev)
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{
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return NULL;
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}
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#endif
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#endif
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