centos man page for usb_ep_clear_halt

USB_EP_CLEAR_HALT(9)					      Kernel Mode Gadget API					      USB_EP_CLEAR_HALT(9)

NAME
       usb_ep_clear_halt - clears endpoint halt, and resets toggle

SYNOPSIS
       int usb_ep_clear_halt(struct usb_ep * ep);

ARGUMENTS
       ep
	   the bulk or interrupt endpoint being reset

DESCRIPTION
       Use this when responding to the standard usb "set interface" request, for endpoints that aren't reconfigured, after clearing any other
       state in the endpoint's i/o queue.

       Returns zero, or a negative error code. On success, this call clears the underlying hardware state reflecting endpoint halt and data
       toggle. Note that some hardware can't support this request (like pxa2xx_udc), and accordingly can't correctly implement interface
       altsettings.

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

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						      USB_EP_CLEAR_HALT(9)