VIDIOC_G_STD
v4l2_disable_ioctl(&dev->vid_cap_dev, VIDIOC_G_STD);
v4l2_disable_ioctl(&dev->vid_out_dev, VIDIOC_G_STD);
v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_G_STD);
v4l2_disable_ioctl(vdev, VIDIOC_G_STD);
SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std);
IOCTL_INFO(VIDIOC_G_STD, v4l_stub_g_std, v4l_print_std, 0),