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Documentation: leds: Add description of LED Flash class extension

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The documentation being added contains overall description of the
LED Flash Class and the related sysfs attributes.

Signed-off-by: Jacek Anaszewski <[email protected]>
Acked-by: Kyungmin Park <[email protected]>
Cc: Richard Purdie <[email protected]>
Signed-off-by: Bryan Wu <[email protected]>
This commit is contained in:
Jacek Anaszewski 2015-03-04 08:14:24 -08:00 • committed by Bryan Wu
commit f6ad395bad
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Documentation/leds/leds-class-flash.txt Normal file
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Flash LED handling under Linux
==============================
Some LED devices provide two modes - torch and flash. In the LED subsystem
those modes are supported by LED class (see Documentation/leds/leds-class.txt)
and LED Flash class respectively. The torch mode related features are enabled
by default and the flash ones only if a driver declares it by setting
LED_DEV_CAP_FLASH flag.
In order to enable the support for flash LEDs CONFIG_LEDS_CLASS_FLASH symbol
must be defined in the kernel config. A LED Flash class driver must be
registered in the LED subsystem with led_classdev_flash_register function.
Following sysfs attributes are exposed for controlling flash LED devices:
(see Documentation/ABI/testing/sysfs-class-led-flash)
- flash_brightness
- max_flash_brightness
- flash_timeout
- max_flash_timeout
- flash_strobe
- flash_fault