f6ad395bad
The documentation being added contains overall description of the LED Flash Class and the related 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>
23 lines
856 B
Plaintext
23 lines
856 B
Plaintext
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Flash LED handling under Linux
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Some LED devices provide two modes - torch and flash. In the LED subsystem
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those modes are supported by LED class (see Documentation/leds/leds-class.txt)
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and LED Flash class respectively. The torch mode related features are enabled
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by default and the flash ones only if a driver declares it by setting
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LED_DEV_CAP_FLASH flag.
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In order to enable the support for flash LEDs CONFIG_LEDS_CLASS_FLASH symbol
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must be defined in the kernel config. A LED Flash class driver must be
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registered in the LED subsystem with led_classdev_flash_register function.
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Following sysfs attributes are exposed for controlling flash LED devices:
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(see Documentation/ABI/testing/sysfs-class-led-flash)
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- flash_brightness
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- max_flash_brightness
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- flash_timeout
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- max_flash_timeout
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- flash_strobe
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- flash_fault
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