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author | Noralf Trønnes <noralf@tronnes.org> | 2020-05-09 16:16:10 +0200 |
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committer | Lee Jones <lee.jones@linaro.org> | 2020-05-11 07:39:16 +0100 |
commit | 479da1f538a2f3547e15f9d5922c611b69ec2fbc (patch) | |
tree | 2ebc2934ac8ba1d0129981f79cd05f257449e4dd /drivers/video/backlight | |
parent | 62a1d3f623ac0338912fdfbdda9bdac4cadcbc75 (diff) | |
download | linux-479da1f538a2f3547e15f9d5922c611b69ec2fbc.tar.gz linux-479da1f538a2f3547e15f9d5922c611b69ec2fbc.tar.bz2 linux-479da1f538a2f3547e15f9d5922c611b69ec2fbc.zip |
backlight: Add backlight_device_get_by_name()
Add a way to lookup a backlight device based on its name.
Will be used by a USB display gadget getting the name from configfs.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/video/backlight')
-rw-r--r-- | drivers/video/backlight/backlight.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index cac3e35d7630..92d80aa0c0ef 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -433,6 +433,27 @@ struct backlight_device *backlight_device_get_by_type(enum backlight_type type) EXPORT_SYMBOL(backlight_device_get_by_type); /** + * backlight_device_get_by_name - Get backlight device by name + * @name: Device name + * + * This function looks up a backlight device by its name. It obtains a reference + * on the backlight device and it is the caller's responsibility to drop the + * reference by calling backlight_put(). + * + * Returns: + * A pointer to the backlight device if found, otherwise NULL. + */ +struct backlight_device *backlight_device_get_by_name(const char *name) +{ + struct device *dev; + + dev = class_find_device_by_name(backlight_class, name); + + return dev ? to_backlight_device(dev) : NULL; +} +EXPORT_SYMBOL(backlight_device_get_by_name); + +/** * backlight_device_unregister - unregisters a backlight device object. * @bd: the backlight device object to be unregistered and freed. * |