• Jacek Anaszewski's avatar
    leds: Add LED Flash class extension to the LED subsystem · 7aea8389
    Jacek Anaszewski authored
    Some LED devices support two operation modes - torch and flash.
    This patch provides support for flash LED devices in the LED subsystem
    by introducing new sysfs attributes and kernel internal interface.
    The attributes being introduced are: flash_brightness, flash_strobe,
    flash_timeout, max_flash_timeout, max_flash_brightness, flash_fault,
    flash_sync_strobe and available_sync_leds. All the flash related
    features are placed in a separate module.
    
    The modifications aim to be compatible with V4L2 framework requirements
    related to the flash devices management. The design assumes that V4L2
    sub-device can take of the LED class device control and communicate
    with it through the kernel internal interface. When V4L2 Flash sub-device
    file is opened, the LED class device sysfs interface is made
    unavailable.
    Signed-off-by: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
    Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
    Cc: Richard Purdie <rpurdie@rpsys.net>
    Acked-by: default avatarPavel Machek <pavel@ucw.cz>
    Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
    7aea8389
led-class-flash.c 11.9 KB