Man page 9 : usb_ep_clear_halt

usb_ep_clear_halt - clears endpoint halt, and resets toggle

int usb_ep_clear_halt(struct usb_ep *  ep );

ep
    the bulk or interrupt endpoint being reset

Use this when responding to the standard usb « set interface » request, for endpoints that arenAqt reconfigured, after clearing any other state in the endpointAqs 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 canAqt support this request (like pxa2xx_udc), and accordingly canAqt correctly implement interface altsettings.

David Brownell <>
    Author.