/************************************************************************
* 文件名稱:HelloWDM.cpp                                                 
* 作    者:張帆
* 完成日期:2007-11-1
*************************************************************************/
#include "HelloWDM.h"

/************************************************************************
* 函數名稱:DriverEntry
* 功能描述:初始化驅動程序，定位和申請硬件資源，創建內核對象
* 參數列表:
      pDriverObject:從I/O管理器中傳進來的驅動對象
      pRegistryPath:驅動程序在注冊表的中的路徑
* 返回 值:返回初始化驅動狀態
*************************************************************************/
#pragma INITCODE 
extern "C" NTSTATUS DriverEntry(IN PDRIVER_OBJECT pDriverObject,
								IN PUNICODE_STRING pRegistryPath)
{
	KdPrint(("Enter DriverEntry\n"));

	pDriverObject->DriverExtension->AddDevice = HelloWDMAddDevice;
	pDriverObject->MajorFunction[IRP_MJ_PNP] = HelloWDMPnp;
	pDriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = 
	pDriverObject->MajorFunction[IRP_MJ_CREATE] = 
	pDriverObject->MajorFunction[IRP_MJ_READ] = 
	pDriverObject->MajorFunction[IRP_MJ_WRITE] = HelloWDMDispatchRoutine;
	pDriverObject->DriverUnload = HelloWDMUnload;

	KdPrint(("Leave DriverEntry\n"));
	return STATUS_SUCCESS;
}

/************************************************************************
* 函數名稱:HelloWDMAddDevice
* 功能描述:添加新設備
* 參數列表:
      DriverObject:從I/O管理器中傳進來的驅動對象
      PhysicalDeviceObject:從I/O管理器中傳進來的物理設備對象
* 返回 值:返回添加新設備狀態
*************************************************************************/
#pragma PAGEDCODE
NTSTATUS HelloWDMAddDevice(IN PDRIVER_OBJECT DriverObject,
                           IN PDEVICE_OBJECT PhysicalDeviceObject)
{ 
	PAGED_CODE();
	KdPrint(("Enter HelloWDMAddDevice\n"));

	NTSTATUS status;
	PDEVICE_OBJECT fdo;
	UNICODE_STRING devName;
	RtlInitUnicodeString(&devName,L"\\Device\\MyWDMDevice");
	status = IoCreateDevice(
		DriverObject,
		sizeof(DEVICE_EXTENSION),
		&(UNICODE_STRING)devName,
		FILE_DEVICE_UNKNOWN,
		0,
		FALSE,
		&fdo);
	if( !NT_SUCCESS(status))
		return status;
	PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION)fdo->DeviceExtension;
	pdx->fdo = fdo;
	pdx->NextStackDevice = IoAttachDeviceToDeviceStack(fdo, PhysicalDeviceObject);
	UNICODE_STRING symLinkName;
	RtlInitUnicodeString(&symLinkName,L"\\DosDevices\\HelloWDM");

	pdx->ustrDeviceName = devName;
	pdx->ustrSymLinkName = symLinkName;
	status = IoCreateSymbolicLink(&(UNICODE_STRING)symLinkName,&(UNICODE_STRING)devName);

	if( !NT_SUCCESS(status))
	{
		IoDeleteSymbolicLink(&pdx->ustrSymLinkName);
		status = IoCreateSymbolicLink(&symLinkName,&devName);
		if( !NT_SUCCESS(status))
		{
			return status;
		}
	}

	fdo->Flags |= DO_BUFFERED_IO | DO_POWER_PAGABLE;
	fdo->Flags &= ~DO_DEVICE_INITIALIZING;

	KdPrint(("Leave HelloWDMAddDevice\n"));
	return STATUS_SUCCESS;
}

/************************************************************************
* 函數名稱:DefaultPnpHandler
* 功能描述:對PNP IRP進行缺省處理
* 參數列表:
      pdx:設備對象的擴展
      Irp:從IO請求包
* 返回 值:返回狀態
*************************************************************************/ 
#pragma PAGEDCODE
NTSTATUS DefaultPnpHandler(PDEVICE_EXTENSION pdx, PIRP Irp)
{
	PAGED_CODE();
	KdPrint(("Enter DefaultPnpHandler\n"));
	IoSkipCurrentIrpStackLocation(Irp);
	KdPrint(("Leave DefaultPnpHandler\n"));
	return IoCallDriver(pdx->NextStackDevice, Irp);
}

/************************************************************************
* 函數名稱:HandleRemoveDevice
* 功能描述:對IRP_MN_REMOVE_DEVICE IRP進行處理
* 參數列表:
      fdo:功能設備對象
      Irp:從IO請求包
* 返回 值:返回狀態
*************************************************************************/
#pragma PAGEDCODE
NTSTATUS HandleRemoveDevice(PDEVICE_EXTENSION pdx, PIRP Irp)
{
	PAGED_CODE();
	KdPrint(("Enter HandleRemoveDevice\n"));

	Irp->IoStatus.Status = STATUS_SUCCESS;
	NTSTATUS status = DefaultPnpHandler(pdx, Irp);
	IoDeleteSymbolicLink(&(UNICODE_STRING)pdx->ustrSymLinkName);

    //調用IoDetachDevice()把fdo從設備棧中脫開：
    if (pdx->NextStackDevice)
        IoDetachDevice(pdx->NextStackDevice);
	
    //刪除fdo：
    IoDeleteDevice(pdx->fdo);
	KdPrint(("Leave HandleRemoveDevice\n"));
	return status;
}

/************************************************************************
* 函數名稱:HelloWDMPnp
* 功能描述:對即插即用IRP進行處理
* 參數列表:
      fdo:功能設備對象
      Irp:從IO請求包
* 返回 值:返回狀態
*************************************************************************/
#pragma PAGEDCODE
NTSTATUS HelloWDMPnp(IN PDEVICE_OBJECT fdo,
                        IN PIRP Irp)
{
	PAGED_CODE();

	KdPrint(("Enter HelloWDMPnp\n"));
	NTSTATUS status = STATUS_SUCCESS;
	PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension;
	PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp);
	static NTSTATUS (*fcntab[])(PDEVICE_EXTENSION pdx, PIRP Irp) = 
	{
		DefaultPnpHandler,		// IRP_MN_START_DEVICE
		DefaultPnpHandler,		// IRP_MN_QUERY_REMOVE_DEVICE
		HandleRemoveDevice,		// IRP_MN_REMOVE_DEVICE
		DefaultPnpHandler,		// IRP_MN_CANCEL_REMOVE_DEVICE
		DefaultPnpHandler,		// IRP_MN_STOP_DEVICE
		DefaultPnpHandler,		// IRP_MN_QUERY_STOP_DEVICE
		DefaultPnpHandler,		// IRP_MN_CANCEL_STOP_DEVICE
		DefaultPnpHandler,		// IRP_MN_QUERY_DEVICE_RELATIONS
		DefaultPnpHandler,		// IRP_MN_QUERY_INTERFACE
		DefaultPnpHandler,		// IRP_MN_QUERY_CAPABILITIES
		DefaultPnpHandler,		// IRP_MN_QUERY_RESOURCES
		DefaultPnpHandler,		// IRP_MN_QUERY_RESOURCE_REQUIREMENTS
		DefaultPnpHandler,		// IRP_MN_QUERY_DEVICE_TEXT
		DefaultPnpHandler,		// IRP_MN_FILTER_RESOURCE_REQUIREMENTS
		DefaultPnpHandler,		// 
		DefaultPnpHandler,		// IRP_MN_READ_CONFIG
		DefaultPnpHandler,		// IRP_MN_WRITE_CONFIG
		DefaultPnpHandler,		// IRP_MN_EJECT
		DefaultPnpHandler,		// IRP_MN_SET_LOCK
		DefaultPnpHandler,		// IRP_MN_QUERY_ID
		DefaultPnpHandler,		// IRP_MN_QUERY_PNP_DEVICE_STATE
		DefaultPnpHandler,		// IRP_MN_QUERY_BUS_INFORMATION
		DefaultPnpHandler,		// IRP_MN_DEVICE_USAGE_NOTIFICATION
		DefaultPnpHandler,		// IRP_MN_SURPRISE_REMOVAL
	};

	ULONG fcn = stack->MinorFunction;
	if (fcn >= arraysize(fcntab))
	{						// unknown function
		status = DefaultPnpHandler(pdx, Irp); // some function we don't know about
		return status;
	}						// unknown function

#if DBG
	static char* fcnname[] = 
	{
		"IRP_MN_START_DEVICE",
		"IRP_MN_QUERY_REMOVE_DEVICE",
		"IRP_MN_REMOVE_DEVICE",
		"IRP_MN_CANCEL_REMOVE_DEVICE",
		"IRP_MN_STOP_DEVICE",
		"IRP_MN_QUERY_STOP_DEVICE",
		"IRP_MN_CANCEL_STOP_DEVICE",
		"IRP_MN_QUERY_DEVICE_RELATIONS",
		"IRP_MN_QUERY_INTERFACE",
		"IRP_MN_QUERY_CAPABILITIES",
		"IRP_MN_QUERY_RESOURCES",
		"IRP_MN_QUERY_RESOURCE_REQUIREMENTS",
		"IRP_MN_QUERY_DEVICE_TEXT",
		"IRP_MN_FILTER_RESOURCE_REQUIREMENTS",
		"",
		"IRP_MN_READ_CONFIG",
		"IRP_MN_WRITE_CONFIG",
		"IRP_MN_EJECT",
		"IRP_MN_SET_LOCK",
		"IRP_MN_QUERY_ID",
		"IRP_MN_QUERY_PNP_DEVICE_STATE",
		"IRP_MN_QUERY_BUS_INFORMATION",
		"IRP_MN_DEVICE_USAGE_NOTIFICATION",
		"IRP_MN_SURPRISE_REMOVAL",
	};

	KdPrint(("PNP Request (%s)\n", fcnname[fcn]));
#endif // DBG

	status = (*fcntab[fcn])(pdx, Irp);
	KdPrint(("Leave HelloWDMPnp\n"));
	return status;
}

/************************************************************************
* 函數名稱:HelloWDMDispatchRoutine
* 功能描述:對缺省IRP進行處理
* 參數列表:
      fdo:功能設備對象
      Irp:從IO請求包
* 返回 值:返回狀態
*************************************************************************/
#pragma PAGEDCODE
NTSTATUS HelloWDMDispatchRoutine(IN PDEVICE_OBJECT fdo,
								 IN PIRP Irp)
{
	PAGED_CODE();
	KdPrint(("Enter HelloWDMDispatchRoutine\n"));
	Irp->IoStatus.Status = STATUS_SUCCESS;
	Irp->IoStatus.Information = 0;	// no bytes xfered
	IoCompleteRequest( Irp, IO_NO_INCREMENT );
	KdPrint(("Leave HelloWDMDispatchRoutine\n"));
	return STATUS_SUCCESS;
}

/************************************************************************
* 函數名稱:HelloWDMUnload
* 功能描述:負責驅動程序的卸載操作
* 參數列表:
      DriverObject:驅動對象
* 返回 值:返回狀態
*************************************************************************/
#pragma PAGEDCODE
void HelloWDMUnload(IN PDRIVER_OBJECT DriverObject)
{
	PAGED_CODE();
	KdPrint(("Enter HelloWDMUnload\n"));
	KdPrint(("Leave HelloWDMUnload\n"));
}