centos man page for usb_ep_enable

USB_EP_ENABLE(9)					      Kernel Mode Gadget API						  USB_EP_ENABLE(9)

NAME
       usb_ep_enable - configure endpoint, making it usable

SYNOPSIS
       int usb_ep_enable(struct usb_ep * ep);

ARGUMENTS
       ep
	   the endpoint being configured. may not be the endpoint named "ep0". drivers discover endpoints through the ep_list of a usb_gadget.

DESCRIPTION
       When configurations are set, or when interface settings change, the driver will enable or disable the relevant endpoints. while it is
       enabled, an endpoint may be used for i/o until the driver receives a disconnect from the host or until the endpoint is disabled.

       the ep0 implementation (which calls this routine) must ensure that the hardware capabilities of each endpoint match the descriptor provided
       for it. for example, an endpoint named "ep2in-bulk" would be usable for interrupt transfers as well as bulk, but it likely couldn't be used
       for iso transfers or for endpoint 14. some endpoints are fully configurable, with more generic names like "ep-a". (remember that for USB,
       "in" means "towards the USB master".)

       returns zero, or a negative error code.

AUTHOR
       David Brownell <dbrownell@users.sourceforge.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							  USB_EP_ENABLE(9)