vidioc_g_jpegcomp
.vidioc_g_jpegcomp = vidioc_g_jpegcomp,
.vidioc_g_jpegcomp = vidioc_g_jpegcomp,
SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp);
int (*vidioc_g_jpegcomp)(struct file *file, void *priv,