host_unr.c
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/*HEADER******************************************************************
**************************************************************************
***
*** Copyright (c) 2001-2002 ARC International.
*** All rights reserved
***
*** This software embodies materials and concepts which are
*** confidential to ARC International and is made
*** available solely pursuant to the terms of a written license
*** agreement with ARC International
***
*** File: hostapi.c
***
*** Comments:
*** This file contains the USB Host API specific functions.
***
**************************************************************************
*END*********************************************************************/
#ifdef __USB_OS_MQX__
#include "mqx.h"
#include "bsp.h"
#else
#include "types.h"
#include "vusb11.h"
#include "usb.h"
#include "hostapi.h"
#endif
#include "usbprv.h"
#include "usbhprv.h"
/*FUNCTION*----------------------------------------------------------------
*
* Function Name : _usb_host_unregister_service
* Returned Value : USB_OK or error code
* Comments :
* Unregisters a callback routine for a specified event or endpoint.
*
*END*--------------------------------------------------------------------*/
uint_8 _usb_host_unregister_service
(
/* [IN] Handle to the USB device */
_usb_host_handle handle,
/* [IN] type of event or endpoint number to service */
uint_8 type
)
{ /* Body */
USB_HOST_STATE_STRUCT_PTR usb_host_ptr;
USB_SERVICE_STRUCT_PTR service_ptr;
USB_SERVICE_STRUCT_PTR _PTR_ search_ptr;
usb_host_ptr = (USB_HOST_STATE_STRUCT_PTR)handle;
/* Needs mutual exclusion */
USB_lock();
/* Search for an existing entry for type */
for (search_ptr = &usb_host_ptr->SERVICE_HEAD_PTR;
*search_ptr;
search_ptr = &(*search_ptr)->NEXT)
{
if ((*search_ptr)->TYPE == type) {
/* Found an existing entry - delete it */
break;
} /* Endif */
} /* Endfor */
/* No existing entry found */
if (!*search_ptr) {
USB_unlock();
return USBERR_CLOSED_SERVICE;
} /* Endif */
service_ptr = *search_ptr;
*search_ptr = service_ptr->NEXT;
USB_unlock();
USB_memfree(service_ptr);
return USB_OK;
} /* EndBody */
/* EOF */