centos man page for usb_register_dev

USB_REGISTER_DEV(9)						   USB Core APIs					       USB_REGISTER_DEV(9)

NAME
       usb_register_dev - register a USB device, and ask for a minor number

SYNOPSIS
       int usb_register_dev(struct usb_interface * intf, struct usb_class_driver * class_driver);

ARGUMENTS
       intf
	   pointer to the usb_interface that is being registered

       class_driver
	   pointer to the usb_class_driver for this device

DESCRIPTION
       This should be called by all USB drivers that use the USB major number. If CONFIG_USB_DYNAMIC_MINORS is enabled, the minor number will be
       dynamically allocated out of the list of available ones. If it is not enabled, the minor number will be based on the next available free
       minor, starting at the class_driver->minor_base.

       This function also creates a usb class device in the sysfs tree.

       usb_deregister_dev must be called when the driver is done with the minor numbers given out by this function.

RETURN
       -EINVAL if something bad happens with trying to register a device, and 0 on success.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       USB_REGISTER_DEV(9)