V4L2_CTRL_FLAG_DISABLED
V4L2_CTRL_FLAG_GRABBED
V4L2_CTRL_FLAG_READ_ONLY
V4L2_CTRL_FLAG_UPDATE
V4L2_CTRL_FLAG_INACTIVE
V4L2_CTRL_FLAG_SLIDER
V4L2_CTRL_FLAG_WRITE_ONLY
V4L2_CTRL_FLAG_VOLATILE