mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-21 18:14:48 +08:00
23 lines
856 B
Plaintext
23 lines
856 B
Plaintext
|
|
||
|
|
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
|