| |
| 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 |
