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author | Jacek Anaszewski <j.anaszewski@samsung.com> | 2014-09-22 08:21:04 -0700 |
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committer | Bryan Wu <cooloney@gmail.com> | 2014-11-14 14:29:35 -0800 |
commit | acd899e4f3066b6662f6047da5b795cc762093cb (patch) | |
tree | 8a0cdf6849c1aec46d741ddee463067951a942ed /drivers/leds/trigger | |
parent | 3f6e42c808409c40dd0d0f8fe2022d197b27455e (diff) | |
download | blackbird-op-linux-acd899e4f3066b6662f6047da5b795cc762093cb.tar.gz blackbird-op-linux-acd899e4f3066b6662f6047da5b795cc762093cb.zip |
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')
0 files changed, 0 insertions, 0 deletions