/* LIBUSB-WIN32, Generic Windows USB Library * Copyright (c) 2002-2005 Stephan Meyer <ste_meyer@web.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */#include "libusb_driver.h"NTSTATUS set_interface(libusb_device_t *dev, int interface, int altsetting,                       int timeout){  NTSTATUS status = STATUS_SUCCESS;  URB *urb;  int i, config_size, tmp_size;  USB_CONFIGURATION_DESCRIPTOR *configuration_descriptor = NULL;  USB_INTERFACE_DESCRIPTOR *interface_descriptor = NULL;  USBD_INTERFACE_INFORMATION *interface_information = NULL;  DEBUG_PRINT_NL();  DEBUG_MESSAGE("set_interface(): interface %d", interface);  DEBUG_MESSAGE("set_interface(): altsetting %d", altsetting);  DEBUG_MESSAGE("set_interface(): timeout %d", timeout);  if(!dev->config.value)    {      DEBUG_ERROR("release_interface(): device is not configured");       return STATUS_INVALID_DEVICE_STATE;    }  configuration_descriptor = get_config_descriptor(dev, dev->config.value,                                                    &config_size);  if(!configuration_descriptor)    {      DEBUG_ERROR("set_interface(): memory_allocation error");      return STATUS_NO_MEMORY;    }  interface_descriptor =    find_interface_desc(configuration_descriptor, config_size,                         interface, altsetting);  if(!interface_descriptor)    {      DEBUG_ERROR("set_interface(): interface %d or altsetting %d invalid",                   interface, altsetting);      ExFreePool(configuration_descriptor);      return STATUS_UNSUCCESSFUL;    }    tmp_size = sizeof(struct _URB_SELECT_INTERFACE)    + interface_descriptor->bNumEndpoints    * sizeof(USBD_PIPE_INFORMATION);  urb = ExAllocatePool(NonPagedPool, tmp_size);  if(!urb)    {      DEBUG_ERROR("set_interface(): memory_allocation error");      ExFreePool(configuration_descriptor);      return STATUS_NO_MEMORY;    }  memset(urb, 0, tmp_size);  urb->UrbHeader.Function = URB_FUNCTION_SELECT_INTERFACE;  urb->UrbHeader.Length = (USHORT)tmp_size;  urb->UrbSelectInterface.ConfigurationHandle = dev->config.handle;  urb->UrbSelectInterface.Interface.Length =    sizeof(struct _USBD_INTERFACE_INFORMATION);  urb->UrbSelectInterface.Interface.NumberOfPipes =     interface_descriptor->bNumEndpoints;  urb->UrbSelectInterface.Interface.Length +=    interface_descriptor->bNumEndpoints     * sizeof(struct _USBD_PIPE_INFORMATION);  urb->UrbSelectInterface.Interface.InterfaceNumber = (UCHAR)interface;  urb->UrbSelectInterface.Interface.AlternateSetting = (UCHAR)altsetting;  interface_information = &urb->UrbSelectInterface.Interface;  for(i = 0; i < interface_descriptor->bNumEndpoints; i++)    {      interface_information->Pipes[i].MaximumTransferSize         = LIBUSB_MAX_READ_WRITE;    }  status = call_usbd(dev, urb, IOCTL_INTERNAL_USB_SUBMIT_URB, timeout);  if(!NT_SUCCESS(status) || !USBD_SUCCESS(urb->UrbHeader.Status))    {      DEBUG_ERROR("set_interface(): setting interface failed: status: 0x%x, "                  "urb-status: 0x%x", status, urb->UrbHeader.Status);      ExFreePool(configuration_descriptor);      ExFreePool(urb);      return STATUS_UNSUCCESSFUL;    }  update_pipe_info(dev, interface_information);  ExFreePool(configuration_descriptor);  ExFreePool(urb);  return status;}