/*++ Copyright (c) 1998 SCM Microsystems, Inc. Module Name: StcUsbNT.c Abstract: Main Driver Module - WDM Version Revision History: PP 1.01 01/19/1998 Initial Version PP 1.00 12/18/1998 Initial Version --*/ #include #include #include #include #include #include #include #include #include #include #include #pragma alloc_text(INIT, DriverEntry) #pragma alloc_text(PAGEABLE, StcUsbAddDevice) #pragma alloc_text(PAGEABLE, StcUsbCreateDevice) #pragma alloc_text(PAGEABLE, StcUsbStartDevice) #pragma alloc_text(PAGEABLE, StcUsbUnloadDriver) #pragma alloc_text(PAGEABLE, StcUsbCreateClose) extern const STC_REGISTER STCInitialize[]; extern const STC_REGISTER STCClose[]; NTSTATUS DriverEntry( PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath ) /*++ DriverEntry: entry function of the driver. setup the callbacks for the OS and try to initialize a device object for every device in the system Arguments: DriverObject context of the driver RegistryPath path to the registry entry for the driver Return Value: STATUS_SUCCESS STATUS_UNSUCCESSFUL --*/ { // SmartcardSetDebugLevel( DEBUG_DRIVER | DEBUG_TRACE ); SmartcardDebug( DEBUG_DRIVER, ("------------------------------------------------------------------\n" ) ); SmartcardDebug( DEBUG_DRIVER, ("%s!DriverEntry: Enter - %s %s\n", DRIVER_NAME, __DATE__, __TIME__)); SmartcardDebug( DEBUG_DRIVER, ("------------------------------------------------------------------\n" ) ); // tell the system our entry points DriverObject->MajorFunction[IRP_MJ_CREATE] = StcUsbCreateClose; DriverObject->MajorFunction[IRP_MJ_CLOSE] = StcUsbCreateClose; DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = StcUsbDeviceIoControl; DriverObject->MajorFunction[IRP_MJ_SYSTEM_CONTROL] = StcUsbSystemControl; DriverObject->MajorFunction[IRP_MJ_CLEANUP] = StcUsbCleanup; DriverObject->MajorFunction[IRP_MJ_PNP] = StcUsbPnP; DriverObject->MajorFunction[IRP_MJ_POWER] = StcUsbPower; DriverObject->DriverExtension->AddDevice = StcUsbAddDevice; DriverObject->DriverUnload = StcUsbUnloadDriver; SmartcardDebug( DEBUG_TRACE, ("%s!DriverEntry: Exit\n", DRIVER_NAME)); return STATUS_SUCCESS;; } NTSTATUS StcUsbAddDevice( IN PDRIVER_OBJECT DriverObject, IN PDEVICE_OBJECT PhysicalDeviceObject) /*++ Routine Description: creates a new device object for the driver, allocates & initializes all neccessary structures (i.e. SmartcardExtension & ReaderExtension). Arguments: DriverObject context of call DeviceObject ptr to the created device object Return Value: STATUS_SUCCESS STATUS_INSUFFICIENT_RESOURCES status returned by smclib.sys --*/ { NTSTATUS status; UNICODE_STRING DriverID; PDEVICE_OBJECT DeviceObject = NULL; PDEVICE_EXTENSION DeviceExtension = NULL; PREADER_EXTENSION ReaderExtension = NULL; PSMARTCARD_EXTENSION SmartcardExtension = NULL; UNICODE_STRING vendorNameU, ifdTypeU; ANSI_STRING vendorNameA, ifdTypeA; HANDLE regKey = NULL; DWORD ReadPriority = -1; // this is a list of our supported data rates static ULONG dataRatesSupported[] = { 9600, 19200, 38400, 55800, 76800, 115200, 153600 }; PAGED_CODE(); SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbAddDevice: Enter\n", DRIVER_NAME)); try { ULONG deviceInstance; RTL_QUERY_REGISTRY_TABLE parameters[4]; RtlZeroMemory(parameters, sizeof(parameters)); RtlZeroMemory(&vendorNameU, sizeof(vendorNameU)); RtlZeroMemory(&ifdTypeU, sizeof(ifdTypeU)); RtlZeroMemory(&vendorNameA, sizeof(vendorNameA)); RtlZeroMemory(&ifdTypeA, sizeof(ifdTypeA)); // Create the device object status = IoCreateDevice( DriverObject, sizeof(DEVICE_EXTENSION), NULL, FILE_DEVICE_SMARTCARD, 0, TRUE, &DeviceObject); if (status != STATUS_SUCCESS) { SmartcardLogError( DriverObject, STCUSB_INSUFFICIENT_RESOURCES, NULL, 0); __leave; } // set up the device extension. DeviceExtension = DeviceObject->DeviceExtension; SmartcardExtension = &DeviceExtension->SmartcardExtension; SmartcardExtension->VendorAttr.UnitNo = MAXULONG; for (deviceInstance = 0; deviceInstance < MAXULONG; deviceInstance++) { PDEVICE_OBJECT devObj; for (devObj = DeviceObject; devObj != NULL; devObj = devObj->NextDevice) { PDEVICE_EXTENSION devExt = devObj->DeviceExtension; PSMARTCARD_EXTENSION smcExt = &devExt->SmartcardExtension; if (deviceInstance == smcExt->VendorAttr.UnitNo) { break; } } if (devObj == NULL) { SmartcardExtension->VendorAttr.UnitNo = deviceInstance; SmartcardExtension->ReaderCapabilities.Channel = deviceInstance; break; } } // Used to synchonize the smartcard detection polling // with the the IO Control routine KeInitializeMutex( &DeviceExtension->hMutex, 1); // Used for stop / start notification KeInitializeEvent( &DeviceExtension->ReaderStarted, NotificationEvent, FALSE); // Used to control the poll thread KeInitializeEvent( &DeviceExtension->FinishPollThread, NotificationEvent, FALSE ); KeInitializeEvent( &DeviceExtension->PollThreadStopped, NotificationEvent, TRUE); DeviceExtension->PollWorkItem = IoAllocateWorkItem( DeviceObject ); if( DeviceExtension->PollWorkItem == NULL ) { status = STATUS_INSUFFICIENT_RESOURCES; __leave; } // allocate the reader extension ReaderExtension = ExAllocatePool(NonPagedPool, sizeof( READER_EXTENSION )); if( ReaderExtension == NULL ) { SmartcardLogError( DriverObject, STCUSB_INSUFFICIENT_RESOURCES, NULL, 0); status = STATUS_INSUFFICIENT_RESOURCES; __leave; } RtlZeroMemory( ReaderExtension, sizeof( READER_EXTENSION )); SmartcardExtension->ReaderExtension = ReaderExtension; SmartcardExtension->ReaderExtension->DeviceObject = DeviceObject; // allocate the extension buffer CB_09/02/01 SmartcardExtension->ReaderExtension->pExtBuffer = ExAllocatePool(NonPagedPool, MIN_BUFFER_SIZE); if (NULL == SmartcardExtension->ReaderExtension->pExtBuffer) { SmartcardLogError( DriverObject, STCUSB_INSUFFICIENT_RESOURCES, NULL, 0); status = STATUS_INSUFFICIENT_RESOURCES; __leave; } // allocate the URB CB_09/02/01 SmartcardExtension->ReaderExtension->pUrb = ExAllocatePool(NonPagedPool, sizeof( struct _URB_BULK_OR_INTERRUPT_TRANSFER )); if (NULL == SmartcardExtension->ReaderExtension->pUrb) { SmartcardLogError( DriverObject, STCUSB_INSUFFICIENT_RESOURCES, NULL, 0); status = STATUS_INSUFFICIENT_RESOURCES; __leave; } // setup smartcard extension - callback's SmartcardExtension->ReaderFunction[RDF_CARD_POWER] = CBCardPower; SmartcardExtension->ReaderFunction[RDF_TRANSMIT] = CBTransmit; SmartcardExtension->ReaderFunction[RDF_CARD_TRACKING] = CBCardTracking; SmartcardExtension->ReaderFunction[RDF_SET_PROTOCOL] = CBSetProtocol; // setup smartcard extension - vendor attribute RtlCopyMemory( SmartcardExtension->VendorAttr.VendorName.Buffer, STCUSB_VENDOR_NAME, sizeof( STCUSB_VENDOR_NAME )); SmartcardExtension->VendorAttr.VendorName.Length = sizeof( STCUSB_VENDOR_NAME ); RtlCopyMemory( SmartcardExtension->VendorAttr.IfdType.Buffer, STCUSB_PRODUCT_NAME, sizeof( STCUSB_PRODUCT_NAME )); SmartcardExtension->VendorAttr.IfdType.Length = sizeof( STCUSB_PRODUCT_NAME ); SmartcardExtension->VendorAttr.IfdVersion.BuildNumber = 0; // store firmware revision in ifd version SmartcardExtension->VendorAttr.IfdVersion.VersionMajor = ReaderExtension->FirmwareMajor; SmartcardExtension->VendorAttr.IfdVersion.VersionMinor = ReaderExtension->FirmwareMinor; SmartcardExtension->VendorAttr.IfdSerialNo.Length = 0; // setup smartcard extension - reader capabilities SmartcardExtension->ReaderCapabilities.SupportedProtocols = SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1; SmartcardExtension->ReaderCapabilities.ReaderType = SCARD_READER_TYPE_USB; SmartcardExtension->ReaderCapabilities.MechProperties = 0; // Clk frequency in KHz encoded as little endian integer SmartcardExtension->ReaderCapabilities.CLKFrequency.Default = 3571; SmartcardExtension->ReaderCapabilities.CLKFrequency.Max = 3571; // reader could support higher data rates SmartcardExtension->ReaderCapabilities.DataRatesSupported.List = dataRatesSupported; SmartcardExtension->ReaderCapabilities.DataRatesSupported.Entries = sizeof(dataRatesSupported) / sizeof(dataRatesSupported[0]); SmartcardExtension->ReaderCapabilities.DataRate.Default =dataRatesSupported[0]; SmartcardExtension->ReaderCapabilities.DataRate.Max = dataRatesSupported[SmartcardExtension->ReaderCapabilities.DataRatesSupported.Entries -1]; // enter correct version of the lib SmartcardExtension->Version = SMCLIB_VERSION; SmartcardExtension->SmartcardRequest.BufferSize = MIN_BUFFER_SIZE; SmartcardExtension->SmartcardReply.BufferSize = MIN_BUFFER_SIZE; SmartcardExtension->ReaderCapabilities.MaxIFSD = 252; SmartcardExtension->ReaderExtension->ReaderPowerState = PowerReaderWorking; status = SmartcardInitialize(SmartcardExtension); if (status != STATUS_SUCCESS) { SmartcardLogError( DriverObject, STCUSB_INSUFFICIENT_RESOURCES, NULL, 0); __leave; } // tell the lib our device object SmartcardExtension->OsData->DeviceObject = DeviceObject; DeviceExtension->AttachedPDO = IoAttachDeviceToDeviceStack( DeviceObject, PhysicalDeviceObject); ASSERT(DeviceExtension->AttachedPDO != NULL); if (DeviceExtension->AttachedPDO == NULL) { status = STATUS_UNSUCCESSFUL; __leave; } // register our new device status = IoRegisterDeviceInterface( PhysicalDeviceObject, &SmartCardReaderGuid, NULL, &DeviceExtension->DeviceName); ASSERT(status == STATUS_SUCCESS); DeviceObject->Flags |= DO_BUFFERED_IO; DeviceObject->Flags |= DO_POWER_PAGABLE; DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING; // // try to read the reader name from the registry // if that does not work, we will use the default // (hardcoded) name // if (IoOpenDeviceRegistryKey( PhysicalDeviceObject, PLUGPLAY_REGKEY_DEVICE, KEY_READ, ®Key ) != STATUS_SUCCESS) { __leave; } parameters[0].Flags = RTL_QUERY_REGISTRY_DIRECT; parameters[0].Name = L"VendorName"; parameters[0].EntryContext = &vendorNameU; parameters[0].DefaultType = REG_SZ; parameters[0].DefaultData = &vendorNameU; parameters[0].DefaultLength = 0; parameters[1].Flags = RTL_QUERY_REGISTRY_DIRECT; parameters[1].Name = L"IfdType"; parameters[1].EntryContext = &ifdTypeU; parameters[1].DefaultType = REG_SZ; parameters[1].DefaultData = &ifdTypeU; parameters[1].DefaultLength = 0; parameters[2].Flags = RTL_QUERY_REGISTRY_DIRECT; parameters[2].Name = L"ReadPriorityBoost"; parameters[2].EntryContext = &ReadPriority; parameters[2].DefaultType = REG_DWORD; parameters[2].DefaultData = 0; parameters[2].DefaultLength = 0; if (RtlQueryRegistryValues( RTL_REGISTRY_HANDLE, (PWSTR) regKey, parameters, NULL, NULL ) != STATUS_SUCCESS) { __leave; } if (ReadPriority > 0) { SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbAddDevice: Setting priority: 0x%x\n", DRIVER_NAME, ReadPriority)); SmartcardExtension->ReaderExtension->Chosen_Priority = (LONG) ReadPriority; } else { SmartcardExtension->ReaderExtension->Chosen_Priority = -1; SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbAddDevice: Leaving priority: 0x%x\n", DRIVER_NAME, ReadPriority)); } if (RtlUnicodeStringToAnsiString( &vendorNameA, &vendorNameU, TRUE ) != STATUS_SUCCESS) { __leave; } if (RtlUnicodeStringToAnsiString( &ifdTypeA, &ifdTypeU, TRUE ) != STATUS_SUCCESS) { __leave; } if (vendorNameA.Length == 0 || vendorNameA.Length > MAXIMUM_ATTR_STRING_LENGTH || ifdTypeA.Length == 0 || ifdTypeA.Length > MAXIMUM_ATTR_STRING_LENGTH) { __leave; } RtlCopyMemory( SmartcardExtension->VendorAttr.VendorName.Buffer, vendorNameA.Buffer, vendorNameA.Length ); SmartcardExtension->VendorAttr.VendorName.Length = vendorNameA.Length; RtlCopyMemory( SmartcardExtension->VendorAttr.IfdType.Buffer, ifdTypeA.Buffer, ifdTypeA.Length ); SmartcardExtension->VendorAttr.IfdType.Length = ifdTypeA.Length; } __finally { if (vendorNameU.Buffer) { RtlFreeUnicodeString(&vendorNameU); } if (ifdTypeU.Buffer) { RtlFreeUnicodeString(&ifdTypeU); } if (vendorNameA.Buffer) { RtlFreeAnsiString(&vendorNameA); } if (ifdTypeA.Buffer) { RtlFreeAnsiString(&ifdTypeA); } if (regKey != NULL) { ZwClose(regKey); } if (status != STATUS_SUCCESS) { StcUsbUnloadDevice(DeviceObject); } SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbAddDevice: Exit %x\n", DRIVER_NAME, status )); } return status; } NTSTATUS StcUsbStartDevice( PDEVICE_OBJECT DeviceObject ) /*++ Routine Description: get the actual configuration from the USB communication layer and initializes the reader hardware Arguments: DeviceObject context of call Return Value: STATUS_SUCCESS status returned by LowLevel routines --*/ { PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension; PSMARTCARD_EXTENSION SmartcardExtension = &DeviceExtension->SmartcardExtension; PREADER_EXTENSION ReaderExtension = SmartcardExtension->ReaderExtension; NTSTATUS NtStatus = STATUS_NO_MEMORY; PURB pUrb = NULL; SmartcardDebug( DEBUG_TRACE, ("%s!StcUsbStartDevice: Enter\n", DRIVER_NAME)); __try { // Initialize the USB interface pUrb = ExAllocatePool( NonPagedPool, sizeof(struct _URB_CONTROL_DESCRIPTOR_REQUEST) ); if(pUrb == NULL) { __leave; } DeviceExtension->DeviceDescriptor = ExAllocatePool( NonPagedPool, sizeof(USB_DEVICE_DESCRIPTOR) ); if(DeviceExtension->DeviceDescriptor == NULL) { __leave; } UsbBuildGetDescriptorRequest( pUrb, sizeof(struct _URB_CONTROL_DESCRIPTOR_REQUEST), USB_DEVICE_DESCRIPTOR_TYPE, 0, 0, DeviceExtension->DeviceDescriptor, NULL, sizeof(USB_DEVICE_DESCRIPTOR), NULL ); // Send the urb to the USB driver NtStatus = UsbCallUSBD(DeviceObject, pUrb); if(NtStatus != STATUS_SUCCESS) { __leave; } NtStatus = UsbConfigureDevice(DeviceObject); if (!NT_SUCCESS(NtStatus)) { __leave; } ReaderExtension->ulReadBufferLen = 0; // setup the STC registers NtStatus = STCConfigureSTC( SmartcardExtension->ReaderExtension, ( PSTC_REGISTER ) STCInitialize ); if (NtStatus != STATUS_SUCCESS) { SmartcardLogError( DeviceObject, STCUSB_CANT_INITIALIZE_READER, NULL, 0); __leave; } UsbGetFirmwareRevision(SmartcardExtension->ReaderExtension); // store firmware revision in ifd version SmartcardExtension->VendorAttr.IfdVersion.VersionMajor = ReaderExtension->FirmwareMajor; SmartcardExtension->VendorAttr.IfdVersion.VersionMinor = ReaderExtension->FirmwareMinor; // CBUpdateCardState(SmartcardExtension ); NtStatus = IoSetDeviceInterfaceState( &DeviceExtension->DeviceName, TRUE ); if (NtStatus == STATUS_OBJECT_NAME_EXISTS) { // We tried to re-enable the device which is ok // This can happen after a stop - start sequence NtStatus = STATUS_SUCCESS; } // signal that the reader has been started KeSetEvent(&DeviceExtension->ReaderStarted, 0, FALSE); // start polling the device for card movement detection StcUsbStartPollThread( DeviceExtension ); ASSERT(NtStatus == STATUS_SUCCESS); } finally { if (pUrb != NULL) { ExFreePool(pUrb); } if (NtStatus != STATUS_SUCCESS) { StcUsbStopDevice(DeviceObject); } SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbStartDevice: Exit %x\n", DRIVER_NAME, NtStatus )); } return NtStatus; } VOID StcUsbStopDevice( PDEVICE_OBJECT DeviceObject) /*++ Routine Description: Finishes card tracking requests and closes the connection to the Usb port. --*/ { PDEVICE_EXTENSION DeviceExtension; NTSTATUS status; LARGE_INTEGER delayPeriod; if (DeviceObject == NULL) { return; } SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbStopDevice: Enter\n", DRIVER_NAME)); DeviceExtension = DeviceObject->DeviceExtension; KeClearEvent(&DeviceExtension->ReaderStarted); // stop polling the reader StcUsbStopPollThread( DeviceExtension ); if (DeviceExtension->DeviceDescriptor) { ExFreePool(DeviceExtension->DeviceDescriptor); DeviceExtension->DeviceDescriptor = NULL; } if (DeviceExtension->Interface) { ExFreePool(DeviceExtension->Interface); DeviceExtension->Interface = NULL; } SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbStopDevice: Exit\n", DRIVER_NAME)); } NTSTATUS StcUsbSystemControl( PDEVICE_OBJECT DeviceObject, PIRP Irp ) { PDEVICE_EXTENSION DeviceExtension; NTSTATUS status = STATUS_SUCCESS; DeviceExtension = DeviceObject->DeviceExtension; IoSkipCurrentIrpStackLocation(Irp); status = IoCallDriver(DeviceExtension->AttachedPDO, Irp); return status; } NTSTATUS StcUsbDeviceIoControl( PDEVICE_OBJECT DeviceObject, PIRP Irp) /*++ StcUsbDeviceIoControl: all IRP's requiring IO are queued to the StartIo routine, other requests are served immediately --*/ { PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension; NTSTATUS status; KIRQL irql; LARGE_INTEGER timeout; PSMARTCARD_EXTENSION SmartcardExtension = &deviceExtension->SmartcardExtension; PREADER_EXTENSION ReaderExtension= SmartcardExtension->ReaderExtension; KeAcquireSpinLock(&deviceExtension->SpinLock, &irql); if (deviceExtension->IoCount < 0) { KeReleaseSpinLock(&deviceExtension->SpinLock, irql); status = KeWaitForSingleObject( &deviceExtension->ReaderStarted, Executive, KernelMode, FALSE, NULL); KeAcquireSpinLock(&deviceExtension->SpinLock, &irql); } ASSERT(deviceExtension->IoCount >= 0); deviceExtension->IoCount++; KeReleaseSpinLock(&deviceExtension->SpinLock, irql); status = SmartcardAcquireRemoveLock(&deviceExtension->SmartcardExtension); if (status != STATUS_SUCCESS) { // the device has been removed. Fail the call Irp->IoStatus.Information = 0; Irp->IoStatus.Status = STATUS_DEVICE_REMOVED; IoCompleteRequest(Irp, IO_NO_INCREMENT); return STATUS_DEVICE_REMOVED; } KeWaitForMutexObject( &deviceExtension->hMutex, Executive, KernelMode, FALSE, NULL); status = SmartcardDeviceControl( &(deviceExtension->SmartcardExtension), Irp); KeReleaseMutex( &deviceExtension->hMutex, FALSE); SmartcardReleaseRemoveLock(&deviceExtension->SmartcardExtension); KeAcquireSpinLock(&deviceExtension->SpinLock, &irql); deviceExtension->IoCount--; ASSERT(deviceExtension->IoCount >= 0); KeReleaseSpinLock(&deviceExtension->SpinLock, irql); return status; } NTSTATUS StcUsbCallComplete ( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN PKEVENT Event) /*++ Routine Description: Completion routine for an Irp sent to the Usb driver. The event will be set to notify that the Usb driver is done. The routine will not 'complete' the Irp, so the caller of CallUsbDriver can continue. --*/ { UNREFERENCED_PARAMETER (DeviceObject); if (Irp->Cancel) { Irp->IoStatus.Status = STATUS_CANCELLED; } KeSetEvent (Event, 0, FALSE); return STATUS_MORE_PROCESSING_REQUIRED; } NTSTATUS StcUsbCallUsbDriver( IN PDEVICE_OBJECT AttachedPDO, IN PIRP Irp) /*++ Routine Description: Send an Irp to the Usb driver. --*/ { NTSTATUS NtStatus = STATUS_SUCCESS; KEVENT Event; // Copy our stack location to the next. IoCopyCurrentIrpStackLocationToNext(Irp); // // initialize an event for process synchronization. the event is passed // to our completion routine and will be set if the pcmcia driver is done // KeInitializeEvent( &Event, NotificationEvent, FALSE); // Our IoCompletionRoutine sets only our event IoSetCompletionRoutine ( Irp, StcUsbCallComplete, &Event, TRUE, TRUE, TRUE); if (IoGetCurrentIrpStackLocation(Irp)->MajorFunction == IRP_MJ_POWER) { NtStatus = PoCallDriver(AttachedPDO, Irp); } else { NtStatus = IoCallDriver(AttachedPDO, Irp); } // Wait until the usb driver has processed the Irp if (NtStatus == STATUS_PENDING) { NtStatus = KeWaitForSingleObject( &Event, Executive, KernelMode, FALSE, NULL); if (NtStatus == STATUS_SUCCESS) { NtStatus = Irp->IoStatus.Status; } } return(NtStatus); } NTSTATUS StcUsbPnP( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) /*++ Routine Description: driver callback for pnp manager All other requests will be passed to the usb driver to ensure correct processing. --*/ { NTSTATUS status = STATUS_SUCCESS; PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension; PSMARTCARD_EXTENSION SmartcardExtension = &DeviceExtension->SmartcardExtension; PIO_STACK_LOCATION IrpStack; PDEVICE_OBJECT AttachedPDO; BOOLEAN deviceRemoved = FALSE; KIRQL irql; PAGED_CODE(); SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbPnP: Enter\n", DRIVER_NAME)); status = SmartcardAcquireRemoveLock(SmartcardExtension); if (status != STATUS_SUCCESS) { Irp->IoStatus.Information = 0; Irp->IoStatus.Status = status; IoCompleteRequest(Irp, IO_NO_INCREMENT); return status; } AttachedPDO = DeviceExtension->AttachedPDO; // Irp->IoStatus.Information = 0; IrpStack = IoGetCurrentIrpStackLocation(Irp); // Now look what the PnP manager wants... switch(IrpStack->MinorFunction) { case IRP_MN_START_DEVICE: // Now we should connect to our resources (Irql, Io etc.) SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_START_DEVICE\n", DRIVER_NAME)); // We have to call the underlying driver first status = StcUsbCallUsbDriver(AttachedPDO, Irp); if (NT_SUCCESS(status)) { status = StcUsbStartDevice(DeviceObject); } break; case IRP_MN_QUERY_STOP_DEVICE: SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_QUERY_STOP_DEVICE\n", DRIVER_NAME)); KeAcquireSpinLock(&DeviceExtension->SpinLock, &irql); if (DeviceExtension->IoCount > 0) { // we refuse to stop if we have pending io KeReleaseSpinLock(&DeviceExtension->SpinLock, irql); status = STATUS_DEVICE_BUSY; } else { // stop processing requests DeviceExtension->IoCount = -1; KeClearEvent(&DeviceExtension->ReaderStarted); KeReleaseSpinLock(&DeviceExtension->SpinLock, irql); status = StcUsbCallUsbDriver(AttachedPDO, Irp); } break; case IRP_MN_CANCEL_STOP_DEVICE: SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_CANCEL_STOP_DEVICE\n", DRIVER_NAME)); status = StcUsbCallUsbDriver(AttachedPDO, Irp); // we can continue to process requests DeviceExtension->IoCount = 0; KeSetEvent(&DeviceExtension->ReaderStarted, 0, FALSE); break; case IRP_MN_STOP_DEVICE: SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_STOP_DEVICE\n", DRIVER_NAME)); StcUsbStopDevice(DeviceObject); status = StcUsbCallUsbDriver(AttachedPDO, Irp); break; case IRP_MN_QUERY_REMOVE_DEVICE: // Remove our device SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_QUERY_REMOVE_DEVICE\n", DRIVER_NAME)); // disable the reader status = IoSetDeviceInterfaceState( &DeviceExtension->DeviceName, FALSE); ASSERT(status == STATUS_SUCCESS); if (status != STATUS_SUCCESS) { break; } // check if the reader has been opened if (DeviceExtension->ReaderOpen) { // someone is connected, enable the reader and fail the call IoSetDeviceInterfaceState( &DeviceExtension->DeviceName, TRUE); status = STATUS_UNSUCCESSFUL; break; } // pass the call to the next driver in the stack status = StcUsbCallUsbDriver(AttachedPDO, Irp); break; case IRP_MN_CANCEL_REMOVE_DEVICE: // Removal of device has been cancelled SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_CANCEL_REMOVE_DEVICE\n", DRIVER_NAME)); // pass the call to the next driver in the stack status = StcUsbCallUsbDriver(AttachedPDO, Irp); if (status == STATUS_SUCCESS) { status = IoSetDeviceInterfaceState( &DeviceExtension->DeviceName, TRUE); } break; case IRP_MN_REMOVE_DEVICE: // Remove our device SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_REMOVE_DEVICE\n", DRIVER_NAME)); StcUsbStopDevice(DeviceObject); StcUsbUnloadDevice(DeviceObject); status = StcUsbCallUsbDriver(AttachedPDO, Irp); deviceRemoved = TRUE; break; default: SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPnP: IRP_MN_...%lx\n", DRIVER_NAME, IrpStack->MinorFunction)); // This is an Irp that is only useful for underlying drivers status = StcUsbCallUsbDriver(AttachedPDO, Irp); break; } Irp->IoStatus.Status = status; IoCompleteRequest( Irp, IO_NO_INCREMENT); if (deviceRemoved == FALSE) { SmartcardReleaseRemoveLock(&DeviceExtension->SmartcardExtension); } SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbPnP: Exit %x\n", DRIVER_NAME, status)); return status; } VOID StcUsbSystemPowerCompletion( IN PDEVICE_OBJECT DeviceObject, IN UCHAR MinorFunction, IN POWER_STATE PowerState, IN PKEVENT Event, IN PIO_STATUS_BLOCK IoStatus ) /*++ Routine Description: This function is called when the underlying stacks completed the power transition. --*/ { UNREFERENCED_PARAMETER (DeviceObject); UNREFERENCED_PARAMETER (MinorFunction); UNREFERENCED_PARAMETER (PowerState); UNREFERENCED_PARAMETER (IoStatus); KeSetEvent(Event, 0, FALSE); } NTSTATUS StcUsbDevicePowerCompletion ( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN PSMARTCARD_EXTENSION SmartcardExtension) /*++ Routine Description: This routine is called after the underlying stack powered UP the Usb port, so it can be used again. --*/ { PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension; PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp); NTSTATUS status; UCHAR state; BOOLEAN CardPresent; // // setup the STC registers // status = STCConfigureSTC( SmartcardExtension->ReaderExtension, ( PSTC_REGISTER ) STCInitialize ); // get the current state of the card CBUpdateCardState(SmartcardExtension); // save the current power state of the reader SmartcardExtension->ReaderExtension->ReaderPowerState = PowerReaderWorking; SmartcardReleaseRemoveLock(SmartcardExtension); // inform the power manager of our state. PoSetPowerState ( DeviceObject, DevicePowerState, irpStack->Parameters.Power.State); PoStartNextPowerIrp(Irp); KeSetEvent(&deviceExtension->ReaderStarted, 0, FALSE); // restart the polling thread StcUsbStartPollThread( deviceExtension ); return STATUS_SUCCESS; } typedef enum _ACTION { Undefined = 0, SkipRequest, WaitForCompletion, CompleteRequest, MarkPending } ACTION; NTSTATUS StcUsbPower ( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) /*++ Routine Description: The power dispatch routine. This driver is the power policy owner of the device stack, because this driver knows about the connected reader. Therefor this driver will translate system power states to device power states. Arguments: DeviceObject - pointer to a device object. Irp - pointer to an I/O Request Packet. Return Value: NT status code --*/ { NTSTATUS status = STATUS_SUCCESS; PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp); PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension; PSMARTCARD_EXTENSION smartcardExtension = &deviceExtension->SmartcardExtension; ACTION action; POWER_STATE powerState; KEVENT event; KIRQL irql; PAGED_CODE(); SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPower: Enter\n", DRIVER_NAME)); status = SmartcardAcquireRemoveLock(smartcardExtension); if (!NT_SUCCESS(status)) { PoStartNextPowerIrp(Irp); Irp->IoStatus.Status = status; IoCompleteRequest(Irp, IO_NO_INCREMENT); return status; } switch (irpStack->Parameters.Power.Type) { case DevicePowerState: if (irpStack->MinorFunction == IRP_MN_SET_POWER) { switch (irpStack->Parameters.Power.State.DeviceState) { case PowerDeviceD0: // Turn on the reader SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPower: PowerDevice D0\n", DRIVER_NAME)); // // First, we send down the request to the bus, in order // to power on the port. When the request completes, // we turn on the reader // IoCopyCurrentIrpStackLocationToNext(Irp); IoSetCompletionRoutine ( Irp, StcUsbDevicePowerCompletion, smartcardExtension, TRUE, TRUE, TRUE); action = WaitForCompletion; break; case PowerDeviceD3: // Turn off the reader SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPower: PowerDevice D3\n", DRIVER_NAME)); KeClearEvent(&deviceExtension->ReaderStarted); StcUsbStopPollThread( deviceExtension ); PoSetPowerState ( DeviceObject, DevicePowerState, irpStack->Parameters.Power.State); // save the current card state KeAcquireSpinLock(&smartcardExtension->OsData->SpinLock, &irql); smartcardExtension->ReaderExtension->CardPresent = smartcardExtension->ReaderCapabilities.CurrentState > SCARD_ABSENT; // power down the card if (smartcardExtension->ReaderCapabilities.CurrentState > SCARD_ABSENT ) { KeReleaseSpinLock(&smartcardExtension->OsData->SpinLock, irql); smartcardExtension->MinorIoControlCode = SCARD_POWER_DOWN; status = CBCardPower(smartcardExtension); // // This will trigger the card monitor, since we do not really // know if the user will remove / re-insert a card while the // system is asleep // } else { KeReleaseSpinLock(&smartcardExtension->OsData->SpinLock, irql); } status = STCConfigureSTC( smartcardExtension->ReaderExtension, ( PSTC_REGISTER ) STCClose ); // save the current power state of the reader smartcardExtension->ReaderExtension->ReaderPowerState = PowerReaderOff; action = SkipRequest; break; default: action = SkipRequest; break; } } else { action = SkipRequest; } break; case SystemPowerState: { // // The system wants to change the power state. // We need to translate the system power state to // a corresponding device power state. // POWER_STATE_TYPE powerType = DevicePowerState; ASSERT(smartcardExtension->ReaderExtension->ReaderPowerState != PowerReaderUnspecified); switch (irpStack->MinorFunction) { case IRP_MN_QUERY_POWER: SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPower: Query Power\n", DRIVER_NAME)); // // By default we succeed and pass down // action = SkipRequest; Irp->IoStatus.Status = STATUS_SUCCESS; switch (irpStack->Parameters.Power.State.SystemState) { case PowerSystemMaximum: case PowerSystemWorking: break; case PowerSystemSleeping1: case PowerSystemSleeping2: case PowerSystemSleeping3: case PowerSystemHibernate: case PowerSystemShutdown: KeAcquireSpinLock(&deviceExtension->SpinLock, &irql); if (deviceExtension->IoCount == 0) { // Block any further ioctls // KeClearEvent(&deviceExtension->ReaderStarted); } else { // can't go to sleep mode since the reader is busy. status = STATUS_DEVICE_BUSY; action = CompleteRequest; } KeReleaseSpinLock(&deviceExtension->SpinLock, irql); break; } break; case IRP_MN_SET_POWER: SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbPower: PowerSystem S%d\n", DRIVER_NAME, irpStack->Parameters.Power.State.SystemState - 1)); switch (irpStack->Parameters.Power.State.SystemState) { case PowerSystemMaximum: case PowerSystemWorking: if (smartcardExtension->ReaderExtension->ReaderPowerState == PowerReaderWorking) { // We're already in the right state KeSetEvent(&deviceExtension->ReaderStarted, 0, FALSE); action = SkipRequest; break; } powerState.DeviceState = PowerDeviceD0; action = MarkPending; break; case PowerSystemSleeping1: case PowerSystemSleeping2: case PowerSystemSleeping3: case PowerSystemHibernate: case PowerSystemShutdown: if (smartcardExtension->ReaderExtension->ReaderPowerState == PowerReaderOff) { // We're already in the right state action = SkipRequest; break; } powerState.DeviceState = PowerDeviceD3; // first, inform the power manager of our new state. PoSetPowerState ( DeviceObject, SystemPowerState, powerState); action = MarkPending; break; default: action = SkipRequest; break; } break; default: action = SkipRequest; break; } } break; default: action = SkipRequest; break; } switch (action) { case CompleteRequest: Irp->IoStatus.Status = status; Irp->IoStatus.Information = 0; SmartcardReleaseRemoveLock(smartcardExtension); PoStartNextPowerIrp(Irp); IoCompleteRequest(Irp, IO_NO_INCREMENT); break; case MarkPending: // initialize the event we need in the completion function KeInitializeEvent( &event, NotificationEvent, FALSE ); // request the device power irp status = PoRequestPowerIrp ( DeviceObject, IRP_MN_SET_POWER, powerState, StcUsbSystemPowerCompletion, &event, NULL ); if (status == STATUS_PENDING) { // wait until the device power irp completed status = KeWaitForSingleObject( &event, Executive, KernelMode, FALSE, NULL ); SmartcardReleaseRemoveLock(smartcardExtension); if (powerState.SystemState == PowerSystemWorking) { PoSetPowerState ( DeviceObject, SystemPowerState, powerState ); } PoStartNextPowerIrp(Irp); IoSkipCurrentIrpStackLocation(Irp); status = PoCallDriver(deviceExtension->AttachedPDO, Irp); } else { SmartcardReleaseRemoveLock(smartcardExtension); Irp->IoStatus.Status = status; IoCompleteRequest(Irp, IO_NO_INCREMENT); } break; case SkipRequest: SmartcardReleaseRemoveLock(smartcardExtension); PoStartNextPowerIrp(Irp); IoSkipCurrentIrpStackLocation(Irp); status = PoCallDriver(deviceExtension->AttachedPDO, Irp); break; case WaitForCompletion: status = PoCallDriver(deviceExtension->AttachedPDO, Irp); break; default: break; } return status; } NTSTATUS StcUsbCreateClose( PDEVICE_OBJECT DeviceObject, PIRP Irp ) /*++ Routine Description: This routine is called by the I/O system when the device is opened or closed. Arguments: DeviceObject context of device Irp context of call Return Value: STATUS_SUCCESS STATUS_DEVICE_BUSY --*/ { PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension; PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp); NTSTATUS status = STATUS_SUCCESS; SmartcardDebug( DEBUG_DRIVER, ("%s!StcCreateClose: Enter\n", DRIVER_NAME)); __try { if (irpStack->MajorFunction == IRP_MJ_CREATE) { status = SmartcardAcquireRemoveLockWithTag( &deviceExtension->SmartcardExtension, 'lCrC' ); if (status != STATUS_SUCCESS) { status = STATUS_DEVICE_REMOVED; __leave; } // test if the device has been opened already if (InterlockedCompareExchange( &deviceExtension->ReaderOpen, TRUE, FALSE) == FALSE) { SmartcardDebug( DEBUG_DRIVER, ("%s!StcCreateClose: Open\n", DRIVER_NAME) ); } else { // the device is already in use status = STATUS_UNSUCCESSFUL; // release the lock SmartcardReleaseRemoveLockWithTag( &deviceExtension->SmartcardExtension, 'lCrC' ); } } else { SmartcardDebug( DEBUG_DRIVER, ("%s!StcCreateClose: Close\n", DRIVER_NAME) ); SmartcardReleaseRemoveLockWithTag( &deviceExtension->SmartcardExtension, 'lCrC' ); deviceExtension->ReaderOpen = FALSE; } } __finally { Irp->IoStatus.Status = status; Irp->IoStatus.Information = 0; IoCompleteRequest(Irp, IO_NO_INCREMENT); } SmartcardDebug( DEBUG_DRIVER, ("%s!StcCreateClose: Exit (%lx)\n", DRIVER_NAME, status)); return status; } NTSTATUS StcUsbCancel( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp ) /*++ Routine Description: This routine is called by the I/O system when the irp should be cancelled Arguments: DeviceObject - Pointer to device object for this miniport Irp - IRP involved. Return Value: STATUS_CANCELLED --*/ { PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension; PSMARTCARD_EXTENSION smartcardExtension = &deviceExtension->SmartcardExtension; SmartcardDebug( DEBUG_TRACE, ("%s!StcUsbCancel: Enter\n", DRIVER_NAME)); ASSERT(Irp == smartcardExtension->OsData->NotificationIrp); Irp->IoStatus.Information = 0; Irp->IoStatus.Status = STATUS_CANCELLED; smartcardExtension->OsData->NotificationIrp = NULL; IoReleaseCancelSpinLock( Irp->CancelIrql); IoCompleteRequest( Irp, IO_NO_INCREMENT); SmartcardDebug( DEBUG_TRACE, ("%s!StcUsbCancel: Exit\n", DRIVER_NAME)); return STATUS_CANCELLED; } NTSTATUS StcUsbCleanup( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp ) /*++ Routine Description: This routine is called by the I/O system when the calling thread terminates Arguments: DeviceObject - Pointer to device object for this miniport Irp - IRP involved. Return Value: STATUS_CANCELLED --*/ { PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension; PSMARTCARD_EXTENSION smartcardExtension = &deviceExtension->SmartcardExtension; NTSTATUS status = STATUS_SUCCESS; KIRQL CancelIrql; SmartcardDebug( DEBUG_TRACE, ("%s!StcUsbCleanup: Enter\n", DRIVER_NAME)); IoAcquireCancelSpinLock(&CancelIrql); // cancel pending notification irps if( smartcardExtension->OsData->NotificationIrp ) { // reset the cancel function so that it won't be called anymore IoSetCancelRoutine( smartcardExtension->OsData->NotificationIrp, NULL ); smartcardExtension->OsData->NotificationIrp->CancelIrql = CancelIrql; StcUsbCancel( DeviceObject, smartcardExtension->OsData->NotificationIrp); } else { IoReleaseCancelSpinLock(CancelIrql); } SmartcardDebug( DEBUG_DRIVER, ("%s!StcUsbCleanup: Completing IRP %lx\n", DRIVER_NAME, Irp)); Irp->IoStatus.Information = 0; Irp->IoStatus.Status = STATUS_SUCCESS; IoCompleteRequest( Irp, IO_NO_INCREMENT); SmartcardDebug( DEBUG_TRACE, ("%s!StcUsbCleanup: Exit\n", DRIVER_NAME)); return STATUS_SUCCESS; } VOID StcUsbUnloadDevice( PDEVICE_OBJECT DeviceObject ) /*++ Routine Description: close connections to smclib.sys and the usb driver, delete symbolic link and mark the slot as unused. Arguments: DeviceObject device to unload Return Value: void --*/ { PDEVICE_EXTENSION DeviceExtension; PSMARTCARD_EXTENSION SmartcardExtension; NTSTATUS status; if (DeviceObject == NULL) { return; } DeviceExtension= DeviceObject->DeviceExtension; SmartcardExtension = &DeviceExtension->SmartcardExtension; SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbUnloadDevice: Enter\n", DRIVER_NAME)); KeWaitForMutexObject( &DeviceExtension->hMutex, Executive, KernelMode, FALSE, NULL); KeReleaseMutex( &DeviceExtension->hMutex, FALSE); // free polling resources if( DeviceExtension->PollWorkItem != NULL ) { IoFreeWorkItem( DeviceExtension->PollWorkItem ); DeviceExtension->PollWorkItem = NULL; } // disable our device so no one can open it IoSetDeviceInterfaceState( &DeviceExtension->DeviceName, FALSE); // report to the lib that the device will be unloaded if(SmartcardExtension->OsData != NULL) { ASSERT(SmartcardExtension->OsData->NotificationIrp == NULL); SmartcardReleaseRemoveLockAndWait(SmartcardExtension); } // delete the symbolic link if( DeviceExtension->DeviceName.Buffer != NULL ) { RtlFreeUnicodeString(&DeviceExtension->DeviceName); DeviceExtension->DeviceName.Buffer = NULL; } if( SmartcardExtension->OsData != NULL ) { SmartcardExit( SmartcardExtension ); } // free extension buffer CB_09/02/01 if (NULL != SmartcardExtension->ReaderExtension->pExtBuffer) { ExFreePool(SmartcardExtension->ReaderExtension->pExtBuffer); SmartcardExtension->ReaderExtension->pExtBuffer = NULL; } if (NULL != SmartcardExtension->ReaderExtension->pUrb) { ExFreePool(SmartcardExtension->ReaderExtension->pUrb); SmartcardExtension->ReaderExtension->pUrb = NULL; } if (DeviceExtension->SmartcardExtension.ReaderExtension != NULL) { ExFreePool(DeviceExtension->SmartcardExtension.ReaderExtension); DeviceExtension->SmartcardExtension.ReaderExtension = NULL; } // Detach from the usb driver if (DeviceExtension->AttachedPDO) { IoDetachDevice(DeviceExtension->AttachedPDO); DeviceExtension->AttachedPDO = NULL; } // delete the device object IoDeleteDevice(DeviceObject); SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbUnloadDevice: Exit\n", DRIVER_NAME)); } VOID StcUsbUnloadDriver( PDRIVER_OBJECT DriverObject) /*++ Description: unloads all devices for a given driver object Arguments: DriverObject context of driver --*/ { SmartcardDebug( DEBUG_TRACE, ( "%s!StcUsbUnloadDriver\n", DRIVER_NAME)); } void SysDelay( ULONG Timeout ) /*++ SysDelay: performs a required delay. Arguments: Timeout delay in milli seconds Return Value: void --*/ { LARGE_INTEGER SysTimeout; SysTimeout.QuadPart = (LONGLONG)-10 * 1000 * Timeout; // KeDelayExecutionThread: counted in 100 ns KeDelayExecutionThread( KernelMode, FALSE, &SysTimeout ); } VOID StcUsbCardDetectionThread( PDEVICE_OBJECT DeviceObject, PDEVICE_EXTENSION DeviceExtension) /*++ StcUsbCardDetectionThread: create the card detection thread Arguments: SmartcardExtension context of call Return Value: - --*/ { NTSTATUS NTStatus = STATUS_SUCCESS; PSMARTCARD_EXTENSION SmartcardExtension = &DeviceExtension->SmartcardExtension; LARGE_INTEGER Timeout; SmartcardDebug( DEBUG_TRACE, ("%s!StcUsbCardDetectionThread\n", DRIVER_NAME)); __try { if (!KeReadStateEvent(&DeviceExtension->ReaderStarted)) { __leave; } NTStatus = SmartcardAcquireRemoveLock(SmartcardExtension); if( NTStatus == STATUS_DELETE_PENDING ) __leave; // wait for the mutex shared with the deviceiocontrol routine NTStatus = KeWaitForMutexObject( &DeviceExtension->hMutex, Executive, KernelMode, FALSE, NULL); if( NTStatus != STATUS_SUCCESS ) __leave; CBUpdateCardState(SmartcardExtension); KeReleaseMutex( &DeviceExtension->hMutex, FALSE ); SmartcardReleaseRemoveLock(SmartcardExtension); Timeout.QuadPart = -10000 * POLLING_PERIOD; NTStatus = KeWaitForSingleObject( &DeviceExtension->FinishPollThread, Executive, KernelMode, FALSE, &Timeout ); // thread stopped? if( NTStatus == STATUS_SUCCESS ) __leave; // queue the work item again IoQueueWorkItem( DeviceExtension->PollWorkItem, StcUsbCardDetectionThread, DelayedWorkQueue, DeviceExtension ); } __finally { if( NTStatus != STATUS_TIMEOUT ) { SmartcardDebug( DEBUG_TRACE, ("%s!StcUsbCardDetectionThread Terminate polling thread\n", DRIVER_NAME)); KeSetEvent( &DeviceExtension->PollThreadStopped, 0, FALSE); } } return; } NTSTATUS StcUsbStartPollThread( PDEVICE_EXTENSION DeviceExtension ) { NTSTATUS NTStatus = STATUS_SUCCESS; KeClearEvent( &DeviceExtension->FinishPollThread ); KeClearEvent( &DeviceExtension->PollThreadStopped ); // queue the work item again IoQueueWorkItem( DeviceExtension->PollWorkItem, StcUsbCardDetectionThread, DelayedWorkQueue, DeviceExtension ); return( NTStatus ); } VOID StcUsbStopPollThread( PDEVICE_EXTENSION DeviceExtension ) { NTSTATUS NTStatus = STATUS_SUCCESS; if( DeviceExtension->PollWorkItem ) { // notify the card detection thread to finish. This will kick the thread out of the wait KeSetEvent( &DeviceExtension->FinishPollThread, 0, FALSE ); KeWaitForSingleObject( &DeviceExtension->PollThreadStopped, Executive, KernelMode, FALSE, 0 ); } return; }