V4L2_CTRL_WHICH_REQUEST_VAL
if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL)
is_request = (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL);
if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL)
if (cs->which == V4L2_CTRL_WHICH_REQUEST_VAL)
case V4L2_CTRL_WHICH_REQUEST_VAL: