internal_ioctl.c

一个在Windows环境下允许用户程序访问USB设备的接口库的源代码.

/* LIBUSB-WIN32, Generic Windows USB Driver
 * Copyright (C) 2002-2003 Stephan Meyer, <[e-mail]>
 *
 * 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_filter.h"


NTSTATUS on_internal_ioctl_complete(DEVICE_OBJECT *device_object, IRP *irp,
				    void *context)
{
  libusb_device_extension *device_extension 
    = (libusb_device_extension *)device_object->DeviceExtension;
  IO_STACK_LOCATION *stack_location = IoGetCurrentIrpStackLocation(irp);
  URB *urb = (URB *)stack_location->Parameters.Others.Argument1;
  USB_CONFIGURATION_DESCRIPTOR *configuration_descriptor = NULL;
  USBD_INTERFACE_INFORMATION *interface_info = NULL; 
  int i;

  if(irp->PendingReturned) 
    {
      IoMarkIrpPending(irp);
    }
    
  if(urb)
    {
      if(!USBD_SUCCESS(urb->UrbHeader.Status))
	{ 
	  return STATUS_SUCCESS;
	}

      switch(urb->UrbHeader.Function)
	{
	case URB_FUNCTION_SELECT_CONFIGURATION:
	  debug_print_nl();
	  debug_printf(DEBUG_MSG, "on_internal_ioctl_complete(): "
		       "URB_FUNCTION_SELECT_CONFIGURATION");
	  configuration_descriptor 
	    = urb->UrbSelectConfiguration.ConfigurationDescriptor;
	  device_extension->configuration_handle =
	    urb->UrbSelectConfiguration.ConfigurationHandle;

	  if(configuration_descriptor)
	    {
	      device_extension->current_configuration = 
		configuration_descriptor->bConfigurationValue;
	      interface_info = &(urb->UrbSelectConfiguration.Interface);
	    }
	  else
	    {
	      device_extension->current_configuration = 0;
	      interface_info = NULL;
	    }
	  
	  if(interface_info)
	    {
	      clear_pipe_info(device_extension);

	      for(i = 0; i < configuration_descriptor->bNumInterfaces; i++)
		{
		  update_pipe_info(device_extension, i, interface_info);
		  interface_info =  (USBD_INTERFACE_INFORMATION *)(((char *)interface_info) 
		    + interface_info->Length); 
		}
	    }
	     
	  debug_printf(DEBUG_MSG, "on_internal_ioctl_complete(): "
		       "current configuration is %d", 
		       device_extension->current_configuration);

	  break;

	case URB_FUNCTION_SELECT_INTERFACE:
	  debug_print_nl();
	  debug_printf(DEBUG_MSG, "on_internal_ioctl_complete(): "
		       "URB_FUNCTION_SELECT_INTERFACE");

	  interface_info = &(urb->UrbSelectInterface.Interface);

	  if(interface_info)
	    {
	      debug_printf(DEBUG_MSG, "on_internal_ioctl_complete(): "
			   "current alternate setting of interface %d is %d",
			   interface_info->InterfaceNumber,
			   interface_info->AlternateSetting);
	    }

	  update_pipe_info(device_extension, interface_info->InterfaceNumber, 
			   interface_info);
	  break;

	default:
	  ;
	}
    }

  return STATUS_SUCCESS;
}