devt
struct devt *fow; /* new device map list */
drm_dp_aux_dev_get_by_minor(MINOR(dev->devt));
(long)old_encode_dev(file->minor->kdev->devt),
(long)old_encode_dev(file_priv->minor->kdev->devt),
(long)old_encode_dev(file_priv->minor->kdev->devt),
(long)old_encode_dev(file_priv->minor->kdev->devt),
usbioctl(dev_t devt, u_long cmd, caddr_t data, int flag, struct proc *p)
int unit = minor(devt);