From 2e4ef3347b4a4eb65c4fd950d94bbd75fed4d798 Mon Sep 17 00:00:00 2001 From: Meghana Madhyastha Date: Wed, 24 Jan 2018 16:37:23 +0000 Subject: 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 Reviewed-by: Noralf Trønnes Reviewed-by: Sean Paul Signed-off-by: Meghana Madhyastha Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/021f8fecfa3f374dc5dcb70fb07a6f6b019bea7b.1516810725.git.meghana.madhyastha@gmail.com --- drivers/video/backlight/backlight.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers') 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); -- cgit v1.2.3-55-g7522