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windows-nt/Source/XPSP1/NT/drivers/parallel/parvdm/parvdm.c

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2020-09-26 03:20:57 -05:00
/*++
Copyright (C) Microsoft Corporation, 1993 - 1999
Module Name:
parvdm.c
Abstract:
This module contains the code for a simple parallel class driver.
Unload and Cleanup are supported. The model for grabing and
releasing the parallel port is embodied in the code for IRP_MJ_READ.
Other IRP requests could be implemented similarly.
Basically, every READ requests that comes in gets
passed down to the port driver as a parallel port allocate
request. This IRP will return to this driver when the driver
Environment:
Kernel mode
Revision History :
--*/
#include "ntosp.h"
#include "parallel.h"
#include "ntddvdm.h"
#include "parvdm.h"
#include "parlog.h"
static const PHYSICAL_ADDRESS PhysicalZero = {0};
NTSTATUS
DriverEntry(
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath
);
BOOLEAN
ParMakeNames(
IN ULONG ParallelPortNumber,
OUT PUNICODE_STRING PortName,
OUT PUNICODE_STRING ClassName,
OUT PUNICODE_STRING LinkName
);
VOID
ParInitializeDeviceObject(
IN PDRIVER_OBJECT DriverObject,
IN ULONG ParallelPortNumber
);
NTSTATUS
ParGetPortInfoFromPortDevice(
IN OUT PDEVICE_EXTENSION Extension
);
VOID
ParReleasePortInfoToPortDevice(
IN OUT PDEVICE_EXTENSION Extension
);
NTSTATUS
ParAllocPort(
IN PDEVICE_EXTENSION Extension,
IN PIRP Irp
);
VOID
ParLogError(
IN PDRIVER_OBJECT DriverObject,
IN PDEVICE_OBJECT DeviceObject OPTIONAL,
IN PHYSICAL_ADDRESS P1,
IN PHYSICAL_ADDRESS P2,
IN ULONG SequenceNumber,
IN UCHAR MajorFunctionCode,
IN UCHAR RetryCount,
IN ULONG UniqueErrorValue,
IN NTSTATUS FinalStatus,
IN NTSTATUS SpecificIOStatus
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(INIT,DriverEntry)
#pragma alloc_text(INIT,ParInitializeDeviceObject)
#pragma alloc_text(INIT,ParMakeNames)
#endif
//
// Keep track of OPEN and CLOSE.
//
ULONG OpenCloseReferenceCount = 1;
PFAST_MUTEX OpenCloseMutex = NULL;
#define ParClaimDriver() \
ExAcquireFastMutex(OpenCloseMutex); \
if(++OpenCloseReferenceCount == 1) { \
MmResetDriverPaging(DriverEntry); \
} \
ExReleaseFastMutex(OpenCloseMutex); \
#define ParReleaseDriver() \
ExAcquireFastMutex(OpenCloseMutex); \
if(--OpenCloseReferenceCount == 0) { \
MmPageEntireDriver(DriverEntry); \
} \
ExReleaseFastMutex(OpenCloseMutex); \
NTSTATUS
DriverEntry(
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath
)
/*++
Routine Description:
This routine is called at system initialization time to initialize
this driver.
Arguments:
DriverObject - Supplies the driver object.
RegistryPath - Supplies the registry path for this driver.
Return Value:
STATUS_SUCCESS - We could initialize at least one device.
STATUS_NO_SUCH_DEVICE - We could not initialize even one device.
--*/
{
ULONG i;
PAGED_CODE();
//
// allocate the mutex to protect driver reference count
//
OpenCloseMutex = ExAllocatePool(NonPagedPool, sizeof(FAST_MUTEX));
if (!OpenCloseMutex) {
//
// NOTE - we could probably do without bailing here and just
// leave a note for ourselves to never page out, but since we
// don't have enough memory to allocate a mutex we should probably
// avoid leaving the driver paged in at all times
//
return STATUS_INSUFFICIENT_RESOURCES;
}
ExInitializeFastMutex(OpenCloseMutex);
for (i = 0; i < IoGetConfigurationInformation()->ParallelCount; i++) {
ParInitializeDeviceObject(DriverObject, i);
}
if (!DriverObject->DeviceObject) {
if( OpenCloseMutex ) {
ExFreePool( OpenCloseMutex );
OpenCloseMutex = NULL;
}
return STATUS_NO_SUCH_DEVICE;
}
//
// Initialize the Driver Object with driver's entry points
//
DriverObject->MajorFunction[IRP_MJ_CREATE] = ParCreateOpen;
DriverObject->MajorFunction[IRP_MJ_CLOSE] = ParClose;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = ParDeviceControl;
DriverObject->DriverUnload = ParUnload;
//
// page out the driver if we can
//
ParReleaseDriver();
return STATUS_SUCCESS;
}
NTSTATUS
ParOpenFileAgainstParport(PDEVICE_EXTENSION extension)
{
NTSTATUS status;
status = IoGetDeviceObjectPointer(&extension->ParPortName, FILE_READ_ATTRIBUTES,
&extension->ParPortFileObject,
&extension->PortDeviceObject);
return status;
}
VOID
ParCloseFileAgainstParport(PDEVICE_EXTENSION extension)
{
if( extension->ParPortFileObject ) {
ObDereferenceObject( extension->ParPortFileObject );
extension->ParPortFileObject = NULL;
}
}
VOID
ParLogError(
IN PDRIVER_OBJECT DriverObject,
IN PDEVICE_OBJECT DeviceObject OPTIONAL,
IN PHYSICAL_ADDRESS P1,
IN PHYSICAL_ADDRESS P2,
IN ULONG SequenceNumber,
IN UCHAR MajorFunctionCode,
IN UCHAR RetryCount,
IN ULONG UniqueErrorValue,
IN NTSTATUS FinalStatus,
IN NTSTATUS SpecificIOStatus
)
/*++
Routine Description:
This routine allocates an error log entry, copies the supplied data
to it, and requests that it be written to the error log file.
Arguments:
DriverObject - Supplies a pointer to the driver object for the
device.
DeviceObject - Supplies a pointer to the device object associated
with the device that had the error, early in
initialization, one may not yet exist.
P1,P2 - Supplies the physical addresses for the controller
ports involved with the error if they are available
and puts them through as dump data.
SequenceNumber - Supplies a ulong value that is unique to an IRP over
the life of the irp in this driver - 0 generally
means an error not associated with an irp.
MajorFunctionCode - Supplies the major function code of the irp if there
is an error associated with it.
RetryCount - Supplies the number of times a particular operation
has been retried.
UniqueErrorValue - Supplies a unique long word that identifies the
particular call to this function.
FinalStatus - Supplies the final status given to the irp that was
associated with this error. If this log entry is
being made during one of the retries this value
will be STATUS_SUCCESS.
SpecificIOStatus - Supplies the IO status for this particular error.
Return Value:
None.
--*/
{
PIO_ERROR_LOG_PACKET errorLogEntry;
PVOID objectToUse;
SHORT dumpToAllocate;
if (ARGUMENT_PRESENT(DeviceObject)) {
objectToUse = DeviceObject;
} else {
objectToUse = DriverObject;
}
dumpToAllocate = 0;
if (P1.LowPart != 0 || P1.HighPart != 0) {
dumpToAllocate = (SHORT) sizeof(PHYSICAL_ADDRESS);
}
if (P2.LowPart != 0 || P2.HighPart != 0) {
dumpToAllocate += (SHORT) sizeof(PHYSICAL_ADDRESS);
}
errorLogEntry = IoAllocateErrorLogEntry(objectToUse,
(UCHAR) (sizeof(IO_ERROR_LOG_PACKET) + dumpToAllocate));
if (!errorLogEntry) {
return;
}
errorLogEntry->ErrorCode = SpecificIOStatus;
errorLogEntry->SequenceNumber = SequenceNumber;
errorLogEntry->MajorFunctionCode = MajorFunctionCode;
errorLogEntry->RetryCount = RetryCount;
errorLogEntry->UniqueErrorValue = UniqueErrorValue;
errorLogEntry->FinalStatus = FinalStatus;
errorLogEntry->DumpDataSize = dumpToAllocate;
if (dumpToAllocate) {
RtlCopyMemory(errorLogEntry->DumpData, &P1, sizeof(PHYSICAL_ADDRESS));
if (dumpToAllocate > sizeof(PHYSICAL_ADDRESS)) {
RtlCopyMemory(((PUCHAR) errorLogEntry->DumpData) +
sizeof(PHYSICAL_ADDRESS), &P2,
sizeof(PHYSICAL_ADDRESS));
}
}
IoWriteErrorLogEntry(errorLogEntry);
}
VOID
ParInitializeDeviceObject(
IN PDRIVER_OBJECT DriverObject,
IN ULONG ParallelPortNumber
)
/*++
Routine Description:
This routine is called for every parallel port in the system. It
will create a class device upon connecting to the port device
corresponding to it.
Arguments:
DriverObject - Supplies the driver object.
ParallelPortNumber - Supplies the number for this port.
Return Value:
None.
--*/
{
UNICODE_STRING portName, className, linkName;
NTSTATUS status;
PDEVICE_OBJECT deviceObject;
PDEVICE_EXTENSION extension;
PFILE_OBJECT fileObject;
PAGED_CODE();
// Cobble together the port and class device names.
if (!ParMakeNames(ParallelPortNumber, &portName, &className, &linkName)) {
ParLogError(DriverObject, NULL, PhysicalZero, PhysicalZero, 0, 0, 0, 1,
STATUS_SUCCESS, PAR_INSUFFICIENT_RESOURCES);
return;
}
// Create the device object.
status = IoCreateDevice(DriverObject, sizeof(DEVICE_EXTENSION),
&className, FILE_DEVICE_PARALLEL_PORT, 0, FALSE,
&deviceObject);
if (!NT_SUCCESS(status)) {
ParLogError(DriverObject, NULL, PhysicalZero, PhysicalZero, 0, 0, 0, 2,
STATUS_SUCCESS, PAR_INSUFFICIENT_RESOURCES);
ExFreePool(linkName.Buffer);
ExFreePool(portName.Buffer);
ExFreePool(className.Buffer);
return;
}
// Now that the device has been created,
// set up the device extension.
extension = deviceObject->DeviceExtension;
RtlZeroMemory(extension, sizeof(DEVICE_EXTENSION));
extension->DeviceObject = deviceObject;
deviceObject->Flags |= DO_BUFFERED_IO;
status = IoGetDeviceObjectPointer(&portName, FILE_READ_ATTRIBUTES,
&fileObject,
&extension->PortDeviceObject);
if (!NT_SUCCESS(status)) {
ParLogError(DriverObject, deviceObject, PhysicalZero, PhysicalZero,
0, 0, 0, 3, STATUS_SUCCESS, PAR_CANT_FIND_PORT_DRIVER);
IoDeleteDevice(deviceObject);
ExFreePool(linkName.Buffer);
ExFreePool(portName.Buffer);
ExFreePool(className.Buffer);
return;
}
ObDereferenceObject(fileObject);
extension->DeviceObject->StackSize =
extension->PortDeviceObject->StackSize + 1;
// We don't own parallel ports initially
extension->PortOwned = FALSE;
// Get the port information from the port device object.
status = ParGetPortInfoFromPortDevice(extension);
if (!NT_SUCCESS(status)) {
ParLogError(DriverObject, deviceObject, PhysicalZero, PhysicalZero,
0, 0, 0, 4, STATUS_SUCCESS, PAR_CANT_FIND_PORT_DRIVER);
IoDeleteDevice(deviceObject);
ExFreePool(linkName.Buffer);
ExFreePool(portName.Buffer);
ExFreePool(className.Buffer);
return;
}
// Set up the symbolic link for windows apps.
status = IoCreateUnprotectedSymbolicLink(&linkName, &className);
if (!NT_SUCCESS(status)) {
ParLogError(DriverObject, deviceObject, extension->OriginalController,
PhysicalZero, 0, 0, 0, 5, STATUS_SUCCESS,
PAR_NO_SYMLINK_CREATED);
extension->CreatedSymbolicLink = FALSE;
ExFreePool(linkName.Buffer);
goto Cleanup;
}
// We were able to create the symbolic link, so record this
// value in the extension for cleanup at unload time.
extension->CreatedSymbolicLink = TRUE;
extension->SymbolicLinkName = linkName;
Cleanup:
// release the port info so the port driver can be paged out
ParReleasePortInfoToPortDevice(extension);
// ExFreePool(portName.Buffer); - save this in extension for
// future CreateFiles against parport
if( portName.Buffer ) {
RtlInitUnicodeString( &extension->ParPortName, portName.Buffer );
}
ExFreePool(className.Buffer);
}
BOOLEAN
ParMakeNames(
IN ULONG ParallelPortNumber,
OUT PUNICODE_STRING PortName,
OUT PUNICODE_STRING ClassName,
OUT PUNICODE_STRING LinkName
)
/*++
Routine Description:
This routine generates the names \Device\ParallelPortN and
\Device\ParallelVdmN, \DosDevices\PARVDMN.
Arguments:
ParallelPortNumber - Supplies the port number.
PortName - Returns the port name.
ClassName - Returns the class name.
LinkName - Returns the symbolic link name.
Return Value:
FALSE - Failure.
TRUE - Success.
--*/
{
UNICODE_STRING prefix, digits, linkPrefix, linkDigits;
WCHAR digitsBuffer[10], linkDigitsBuffer[10];
UNICODE_STRING portSuffix, classSuffix, linkSuffix;
NTSTATUS status;
// Put together local variables for constructing names.
RtlInitUnicodeString(&prefix, L"\\Device\\");
RtlInitUnicodeString(&linkPrefix, L"\\DosDevices\\");
RtlInitUnicodeString(&portSuffix, DD_PARALLEL_PORT_BASE_NAME_U);
RtlInitUnicodeString(&classSuffix, L"ParallelVdm");
RtlInitUnicodeString(&linkSuffix, L"$VDMLPT");
digits.Length = 0;
digits.MaximumLength = 20;
digits.Buffer = digitsBuffer;
linkDigits.Length = 0;
linkDigits.MaximumLength = 20;
linkDigits.Buffer = linkDigitsBuffer;
status = RtlIntegerToUnicodeString(ParallelPortNumber, 10, &digits);
if (!NT_SUCCESS(status)) {
return FALSE;
}
status = RtlIntegerToUnicodeString(ParallelPortNumber + 1, 10, &linkDigits);
if (!NT_SUCCESS(status)) {
return FALSE;
}
// Make the port name.
PortName->Length = 0;
PortName->MaximumLength = prefix.Length + portSuffix.Length +
digits.Length + sizeof(WCHAR);
PortName->Buffer = ExAllocatePool(PagedPool, PortName->MaximumLength);
if (!PortName->Buffer) {
return FALSE;
}
RtlZeroMemory(PortName->Buffer, PortName->MaximumLength);
RtlAppendUnicodeStringToString(PortName, &prefix);
RtlAppendUnicodeStringToString(PortName, &portSuffix);
RtlAppendUnicodeStringToString(PortName, &digits);
// Make the class name.
ClassName->Length = 0;
ClassName->MaximumLength = prefix.Length + classSuffix.Length +
digits.Length + sizeof(WCHAR);
ClassName->Buffer = ExAllocatePool(PagedPool, ClassName->MaximumLength);
if (!ClassName->Buffer) {
ExFreePool(PortName->Buffer);
return FALSE;
}
RtlZeroMemory(ClassName->Buffer, ClassName->MaximumLength);
RtlAppendUnicodeStringToString(ClassName, &prefix);
RtlAppendUnicodeStringToString(ClassName, &classSuffix);
RtlAppendUnicodeStringToString(ClassName, &digits);
// Make the link name.
LinkName->Length = 0;
LinkName->MaximumLength = linkPrefix.Length + linkSuffix.Length +
linkDigits.Length + sizeof(WCHAR);
LinkName->Buffer = ExAllocatePool(PagedPool, LinkName->MaximumLength);
if (!LinkName->Buffer) {
ExFreePool(PortName->Buffer);
ExFreePool(ClassName->Buffer);
return FALSE;
}
RtlZeroMemory(LinkName->Buffer, LinkName->MaximumLength);
RtlAppendUnicodeStringToString(LinkName, &linkPrefix);
RtlAppendUnicodeStringToString(LinkName, &linkSuffix);
RtlAppendUnicodeStringToString(LinkName, &linkDigits);
return TRUE;
}
VOID
ParReleasePortInfoToPortDevice(
IN PDEVICE_EXTENSION Extension
)
/*++
Routine Description:
This routine will release the port information back to the port driver.
Arguments:
Extension - Supplies the device extension.
Return Value:
None.
--*/
{
KEVENT event;
PIRP irp;
IO_STATUS_BLOCK ioStatus;
NTSTATUS status;
KeInitializeEvent(&event, NotificationEvent, FALSE);
irp = IoBuildDeviceIoControlRequest(IOCTL_INTERNAL_RELEASE_PARALLEL_PORT_INFO,
Extension->PortDeviceObject,
NULL, 0, NULL, 0,
TRUE, &event, &ioStatus);
if (!irp) {
return;
}
status = IoCallDriver(Extension->PortDeviceObject, irp);
if (!NT_SUCCESS(status)) {
return;
}
KeWaitForSingleObject(&event, Executive, KernelMode, FALSE, NULL);
}
NTSTATUS
ParGetPortInfoFromPortDevice(
IN OUT PDEVICE_EXTENSION Extension
)
/*++
Routine Description:
This routine will request the port information from the port driver
and fill it in the device extension.
Arguments:
Extension - Supplies the device extension.
Return Value:
STATUS_SUCCESS - Success.
!STATUS_SUCCESS - Failure.
--*/
{
KEVENT event;
PIRP irp;
PARALLEL_PORT_INFORMATION portInfo;
IO_STATUS_BLOCK ioStatus;
NTSTATUS status;
KeInitializeEvent(&event, NotificationEvent, FALSE);
irp = IoBuildDeviceIoControlRequest(IOCTL_INTERNAL_GET_PARALLEL_PORT_INFO,
Extension->PortDeviceObject,
NULL, 0, &portInfo,
sizeof(PARALLEL_PORT_INFORMATION),
TRUE, &event, &ioStatus);
if (!irp) {
return STATUS_INSUFFICIENT_RESOURCES;
}
status = IoCallDriver(Extension->PortDeviceObject, irp);
if (!NT_SUCCESS(status)) {
return status;
}
status = KeWaitForSingleObject(&event, Executive, KernelMode, FALSE, NULL);
if (!NT_SUCCESS(status)) {
return status;
}
Extension->OriginalController = portInfo.OriginalController;
Extension->Controller = portInfo.Controller;
Extension->SpanOfController = portInfo.SpanOfController;
Extension->FreePort = portInfo.FreePort;
Extension->FreePortContext = portInfo.Context;
if (Extension->SpanOfController < PARALLEL_REGISTER_SPAN) {
return STATUS_INSUFFICIENT_RESOURCES;
}
return status;
}
VOID
ParCompleteRequest(
IN PDEVICE_EXTENSION Extension,
IN PIRP Irp
)
/*++
Routine Description:
This routine completes the 'CurrentIrp' after it was returned
from the port driver.
Arguments:
Extension - Supplies the device extension.
Return Value:
None.
--*/
{
// DbgPrint("ParVDMCompleteRequest: Enter with irp = %#08x\n", Irp);
//
// If the allocate failed, then fail this request
//
if (!NT_SUCCESS(Irp->IoStatus.Status)) {
// failed to allocate port, release port info back to port driver
// and paged ourselves out.
ParReleasePortInfoToPortDevice(Extension);
ParReleaseDriver();
IoCompleteRequest(Irp, IO_NO_INCREMENT);
Extension->CreateOpenLock = 0;
return;
}
//
// This is where the driver specific stuff should go. The driver
// has exclusive access to the parallel port in this space.
//
// DbgPrint("ParVDMCompleteRequest: We own the port\n");
Extension->PortOwned = TRUE;
//
// Complete the IRP, free the port, and start up the next IRP in
// the queue.
//
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_PARALLEL_INCREMENT);
return;
}
VOID
ParCancel(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This is the cancel routine for this driver.
Arguments:
DeviceObject - Supplies the device object.
Irp - Supplies the I/O request packet.
Return Value:
None.
--*/
{
RemoveEntryList(&Irp->Tail.Overlay.ListEntry);
IoReleaseCancelSpinLock(Irp->CancelIrql);
Irp->IoStatus.Information = 0;
Irp->IoStatus.Status = STATUS_CANCELLED;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
}
NTSTATUS
ParCreateOpen(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine is the dispatch for create requests.
Arguments:
DeviceObject - Supplies the device object.
Irp - Supplies the I/O request packet.
Return Value:
STATUS_SUCCESS - Success.
STATUS_NOT_A_DIRECTORY - This device is not a directory.
--*/
{
PIO_STACK_LOCATION irpSp;
NTSTATUS status;
PDEVICE_EXTENSION extension = DeviceObject->DeviceExtension;
//
// Enforce exclusive access to this device
//
if( InterlockedExchange( &extension->CreateOpenLock, 1 ) ) {
Irp->IoStatus.Status = STATUS_ACCESS_DENIED;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_ACCESS_DENIED;
}
if(extension->PortOwned) {
//
// Do an early exit if we can detect that another client has
// already acquired the port for exclusive use.
//
Irp->IoStatus.Status = STATUS_ACCESS_DENIED;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
extension->CreateOpenLock = 0;
return STATUS_ACCESS_DENIED;
}
irpSp = IoGetCurrentIrpStackLocation(Irp);
if (irpSp->MajorFunction == IRP_MJ_CREATE &&
irpSp->Parameters.Create.Options & FILE_DIRECTORY_FILE) {
//
// Bail out if client thinks that we are a directory.
//
Irp->IoStatus.Status = STATUS_NOT_A_DIRECTORY;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
extension->CreateOpenLock = 0;
return STATUS_NOT_A_DIRECTORY;
}
// DVDF - open FILE against parport device
status = ParOpenFileAgainstParport( extension );
if( !NT_SUCCESS( status ) ) {
//
// We couldn't open a handle to the parport device - bail out
//
Irp->IoStatus.Status = STATUS_ACCESS_DENIED;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
extension->CreateOpenLock = 0;
return STATUS_ACCESS_DENIED;
}
//Lock in driver code
ParClaimDriver();
// lock in ParPort driver
ParGetPortInfoFromPortDevice(extension);
// try to allocate the port for our exclusive use
status = ParAllocPort(extension, Irp);
// DbgPrint("ParVDMDeviceControl: ParAllocPort returned %#08lx\n");
if( !NT_SUCCESS( status ) ) {
extension->CreateOpenLock = 0;
}
return status;
}
NTSTATUS
ParClose(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine is the dispatch for a close requests.
Arguments:
DeviceObject - Supplies the device object.
Irp - Supplies the I/O request packet.
Return Value:
STATUS_SUCCESS - Success.
--*/
{
PDEVICE_EXTENSION extension;
NTSTATUS statusOfWait;
extension = DeviceObject->DeviceExtension;
if (!extension->PortOwned)
return STATUS_ACCESS_DENIED;
// free the port for other uses
extension->FreePort(extension->FreePortContext);
extension->PortOwned = FALSE;
// Allow the port driver to be paged.
ParReleasePortInfoToPortDevice(extension);
IoCompleteRequest(Irp, IO_NO_INCREMENT);
// DVDF - close our FILE
ParCloseFileAgainstParport(extension);
// Unlock the code that was locked during the open.
ParReleaseDriver();
// DbgPrint("ParVDMClose: Close device, we no longer own the port\n");
extension->CreateOpenLock = 0;
return STATUS_SUCCESS;
}
NTSTATUS
ParAllocateCompletionRoutine(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Extension
)
/*++
Routine Description:
This is the completion routine for the device control request.
This driver has exclusive access to the parallel port in this
routine.
Arguments:
DeviceObject - Supplies the device object.
Irp - Supplies the I/O request packet.
Extension - Supplies the device extension.
Return Value:
STATUS_MORE_PROCESSING_REQUIRED
--*/
{
KIRQL oldIrql;
LONG irpRef;
if( Irp->PendingReturned ) {
IoMarkIrpPending( Irp );
}
ParCompleteRequest(Extension, Irp);
// If the IRP was completed. It was completed with 'IoCompleteRequest'.
return STATUS_MORE_PROCESSING_REQUIRED;
}
NTSTATUS
ParAllocPort(
IN PDEVICE_EXTENSION Extension,
IN PIRP Irp
)
/*++
Routine Description:
This routine takes the 'CurrentIrp' and sends it down to the
port driver as an allocate parallel port request.
Arguments:
Extension - Supplies the device extension.
Return Value:
None.
--*/
{
PIO_STACK_LOCATION nextSp;
// DbgPrint("ParVDMAllocPort: Entry\n");
nextSp = IoGetNextIrpStackLocation(Irp);
nextSp->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
nextSp->Parameters.DeviceIoControl.IoControlCode =
IOCTL_INTERNAL_PARALLEL_PORT_ALLOCATE;
IoSetCompletionRoutine(Irp,
ParAllocateCompletionRoutine,
Extension, TRUE, TRUE, TRUE);
// DbgPrint("ParVDMAllocPort: Sending Request and exiting\n");
return IoCallDriver(Extension->PortDeviceObject, Irp);
}
NTSTATUS
ParDeviceControl(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine is the dispatch for device control requests.
Arguments:
DeviceObject - Supplies the device object.
Irp - Supplies the I/O request packet.
Return Value:
STATUS_PENDING - Request pending.
--*/
{
PDEVICE_EXTENSION extension;
PIO_STACK_LOCATION currentStack;
NTSTATUS status = STATUS_INVALID_PARAMETER;
extension = DeviceObject->DeviceExtension;
currentStack = IoGetCurrentIrpStackLocation(Irp);
switch(currentStack->Parameters.DeviceIoControl.IoControlCode) {
case IOCTL_VDM_PAR_WRITE_DATA_PORT: {
// DbgPrint("ParVDMDeviceControl: IOCTL_VDM_PAR_WRITE_DATA_PORT\n");
if(extension->PortOwned) {
UCHAR *data = (PUCHAR) Irp->AssociatedIrp.SystemBuffer;
ULONG length = currentStack->Parameters.DeviceIoControl.InputBufferLength;
Irp->IoStatus.Information = 0;
if (length == 1) {
WRITE_PORT_UCHAR(extension->Controller +
PARALLEL_DATA_OFFSET,
*data);
} else {
for(; length != 0; length--, data++) {
WRITE_PORT_UCHAR(extension->Controller +
PARALLEL_DATA_OFFSET,
*data);
// KeStallExecutionProcessor(1);
}
}
status = STATUS_SUCCESS;
} else {
status = STATUS_ACCESS_DENIED;
}
break;
}
case IOCTL_VDM_PAR_READ_STATUS_PORT: {
// DbgPrint("ParVDMDeviceControl: IOCTL_VDM_PAR_READ_STATUS_PORT\n");
if (extension->PortOwned) {
if(currentStack->Parameters.DeviceIoControl.OutputBufferLength >= sizeof(UCHAR)) {
*(PUCHAR)(Irp->AssociatedIrp.SystemBuffer) =
READ_PORT_UCHAR(extension->Controller +
PARALLEL_STATUS_OFFSET);
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(UCHAR);
} else {
status = STATUS_INVALID_PARAMETER;
}
} else {
status = STATUS_ACCESS_DENIED;
}
break;
}
case IOCTL_VDM_PAR_WRITE_CONTROL_PORT: {
// DbgPrint("ParVDMDeviceControl: IOCTL_VDM_PAR_WRITE_CONTROL_PORT\n");
if(extension->PortOwned) {
if(currentStack->Parameters.DeviceIoControl.OutputBufferLength >= sizeof(UCHAR)) {
WRITE_PORT_UCHAR(
extension->Controller + PARALLEL_CONTROL_OFFSET,
*(PUCHAR)(Irp->AssociatedIrp.SystemBuffer)
);
status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(UCHAR);
} else {
status = STATUS_INVALID_PARAMETER;
}
} else {
status = STATUS_ACCESS_DENIED;
}
break;
}
default: {
// DbgPrint("ParVDMDeviceControl: Unknown IOCTL\n");
status = STATUS_INVALID_PARAMETER;
break;
}
}
// DbgPrint("ParVDMDeviceControl: Exit with status %#08lx\n", status);
Irp->IoStatus.Status = status;
IoCompleteRequest(Irp, IO_PARALLEL_INCREMENT);
return status;
}
VOID
ParUnload(
IN PDRIVER_OBJECT DriverObject
)
/*++
Routine Description:
This routine loops through the device list and cleans up after
each of the devices.
Arguments:
DriverObject - Supplies the driver object.
Return Value:
None.
--*/
{
PDEVICE_OBJECT currentDevice;
PDEVICE_EXTENSION extension;
KEVENT event;
PARALLEL_INTERRUPT_SERVICE_ROUTINE interruptService;
PIRP irp;
IO_STATUS_BLOCK ioStatus;
while (currentDevice = DriverObject->DeviceObject) {
extension = currentDevice->DeviceExtension;
if (extension->CreatedSymbolicLink) {
IoDeleteSymbolicLink(&extension->SymbolicLinkName);
ExFreePool(extension->SymbolicLinkName.Buffer);
}
if( extension->ParPortName.Buffer ) {
RtlFreeUnicodeString( &extension->ParPortName );
}
IoDeleteDevice(currentDevice);
}
if( OpenCloseMutex ) {
ExFreePool( OpenCloseMutex );
OpenCloseMutex = NULL;
}
}
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