control.cpp

来自「Programming the Microsoft Windows driver」· C++ 代码 · 共 60 行

// Control.cpp -- IOCTL handlers for usb42 driver
// Copyright (C) 1999 by Walter Oney
// All rights reserved

#include "stddcls.h"
#include "driver.h"
#include "ioctls.h"

///////////////////////////////////////////////////////////////////////////////

#pragma PAGEDCODE

NTSTATUS DispatchControl(PDEVICE_OBJECT fdo, PIRP Irp)
	{							// DispatchControl
	PAGED_CODE();
	PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension;

	NTSTATUS status = IoAcquireRemoveLock(&pdx->RemoveLock, Irp);
	if (!NT_SUCCESS(status))
		return CompleteRequest(Irp, status, 0);
	ULONG info = 0;

	PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp);
	ULONG cbin = stack->Parameters.DeviceIoControl.InputBufferLength;
	ULONG cbout = stack->Parameters.DeviceIoControl.OutputBufferLength;
	ULONG code = stack->Parameters.DeviceIoControl.IoControlCode;

	switch (code)
		{						// process request

	case IOCTL_USB42_READ:
		{						// IOCTL_USB42_READ
		if (cbout != 64)
			{
			status = STATUS_INVALID_PARAMETER;
			break;
			}

		URB urb;
		UsbBuildInterruptOrBulkTransferRequest(&urb, sizeof(_URB_BULK_OR_INTERRUPT_TRANSFER),
			pdx->hpipe, Irp->AssociatedIrp.SystemBuffer, NULL, cbout, USBD_TRANSFER_DIRECTION_IN | USBD_SHORT_TRANSFER_OK, NULL);
		status = SendAwaitUrb(fdo, &urb);
		if (!NT_SUCCESS(status))
			KdPrint(("USB42 - Error %X (USBD status code %X) trying to read endpoint\n", status, urb.UrbHeader.Status));
		else
			info = cbout;
		break;
		}						// IOCTL_USB42_READ

	default:
		status = STATUS_INVALID_DEVICE_REQUEST;
		break;

		}						// process request

	IoReleaseRemoveLock(&pdx->RemoveLock, Irp);
	return CompleteRequest(Irp, status, info);
	}							// DispatchControl