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authorJacek Anaszewski <j.anaszewski@samsung.com>2014-09-22 08:21:04 -0700
committerBryan Wu <cooloney@gmail.com>2014-11-14 14:29:35 -0800
commitacd899e4f3066b6662f6047da5b795cc762093cb (patch)
tree8a0cdf6849c1aec46d741ddee463067951a942ed /drivers/leds/trigger
parent3f6e42c808409c40dd0d0f8fe2022d197b27455e (diff)
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leds: implement sysfs interface locking mechanism
Add a mechanism for locking LED subsystem sysfs interface. This patch prepares ground for addition of LED Flash Class extension, whose API will be integrated with V4L2 Flash API. Such a fusion enforces introducing a locking scheme, which will secure consistent access to the LED Flash Class device. The mechanism being introduced allows for disabling LED subsystem sysfs interface by calling led_sysfs_disable function and enabling it by calling led_sysfs_enable. The functions alter the LED_SYSFS_DISABLE flag state and must be called under mutex lock. The state of the lock is checked with use of led_sysfs_is_disabled function. Such a design allows for providing immediate feedback to the user space on whether the LED Flash Class device is available or is under V4L2 Flash sub-device control. Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds/trigger')
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