USB_MAJOR
MKDEV(USB_MAJOR, minor), class_driver,
device_destroy(&usbmisc_class, MKDEV(USB_MAJOR, intf->minor));
error = register_chrdev(USB_MAJOR, "usb", &usb_fops);
USB_MAJOR);
unregister_chrdev(USB_MAJOR, "usb");
(intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
USB_MAJOR, dev->minor);