9c4a8e138c
Add a documentation of LED Flash class specific sysfs attributes. 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>
81 lines
3.0 KiB
Plaintext
81 lines
3.0 KiB
Plaintext
What: /sys/class/leds/<led>/flash_brightness
|
|
Date: March 2015
|
|
KernelVersion: 4.0
|
|
Contact: Jacek Anaszewski <j.anaszewski@samsung.com>
|
|
Description: read/write
|
|
Set the brightness of this LED in the flash strobe mode, in
|
|
microamperes. The file is created only for the flash LED devices
|
|
that support setting flash brightness.
|
|
|
|
The value is between 0 and
|
|
/sys/class/leds/<led>/max_flash_brightness.
|
|
|
|
What: /sys/class/leds/<led>/max_flash_brightness
|
|
Date: March 2015
|
|
KernelVersion: 4.0
|
|
Contact: Jacek Anaszewski <j.anaszewski@samsung.com>
|
|
Description: read only
|
|
Maximum brightness level for this LED in the flash strobe mode,
|
|
in microamperes.
|
|
|
|
What: /sys/class/leds/<led>/flash_timeout
|
|
Date: March 2015
|
|
KernelVersion: 4.0
|
|
Contact: Jacek Anaszewski <j.anaszewski@samsung.com>
|
|
Description: read/write
|
|
Hardware timeout for flash, in microseconds. The flash strobe
|
|
is stopped after this period of time has passed from the start
|
|
of the strobe. The file is created only for the flash LED
|
|
devices that support setting flash timeout.
|
|
|
|
What: /sys/class/leds/<led>/max_flash_timeout
|
|
Date: March 2015
|
|
KernelVersion: 4.0
|
|
Contact: Jacek Anaszewski <j.anaszewski@samsung.com>
|
|
Description: read only
|
|
Maximum flash timeout for this LED, in microseconds.
|
|
|
|
What: /sys/class/leds/<led>/flash_strobe
|
|
Date: March 2015
|
|
KernelVersion: 4.0
|
|
Contact: Jacek Anaszewski <j.anaszewski@samsung.com>
|
|
Description: read/write
|
|
Flash strobe state. When written with 1 it triggers flash strobe
|
|
and when written with 0 it turns the flash off.
|
|
|
|
On read 1 means that flash is currently strobing and 0 means
|
|
that flash is off.
|
|
|
|
What: /sys/class/leds/<led>/flash_fault
|
|
Date: March 2015
|
|
KernelVersion: 4.0
|
|
Contact: Jacek Anaszewski <j.anaszewski@samsung.com>
|
|
Description: read only
|
|
Space separated list of flash faults that may have occurred.
|
|
Flash faults are re-read after strobing the flash. Possible
|
|
flash faults:
|
|
|
|
* led-over-voltage - flash controller voltage to the flash LED
|
|
has exceeded the limit specific to the flash controller
|
|
* flash-timeout-exceeded - the flash strobe was still on when
|
|
the timeout set by the user has expired; not all flash
|
|
controllers may set this in all such conditions
|
|
* controller-over-temperature - the flash controller has
|
|
overheated
|
|
* controller-short-circuit - the short circuit protection
|
|
of the flash controller has been triggered
|
|
* led-power-supply-over-current - current in the LED power
|
|
supply has exceeded the limit specific to the flash
|
|
controller
|
|
* indicator-led-fault - the flash controller has detected
|
|
a short or open circuit condition on the indicator LED
|
|
* led-under-voltage - flash controller voltage to the flash
|
|
LED has been below the minimum limit specific to
|
|
the flash
|
|
* controller-under-voltage - the input voltage of the flash
|
|
controller is below the limit under which strobing the
|
|
flash at full current will not be possible;
|
|
the condition persists until this flag is no longer set
|
|
* led-over-temperature - the temperature of the LED has exceeded
|
|
its allowed upper limit
|