VIDIOC_G_PARM
v4l2_disable_ioctl(vfd, VIDIOC_G_PARM);
v4l2_disable_ioctl(vfd, VIDIOC_G_PARM);
v4l2_disable_ioctl(&video->video, VIDIOC_G_PARM);
SET_VALID_IOCTL(ops, VIDIOC_G_PARM, vidioc_g_parm);
__set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
IOCTL_INFO(VIDIOC_G_PARM, v4l_g_parm, v4l_print_streamparm, INFO_FL_CLEAR(v4l2_streamparm, type)),