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windows-server-2003/drivers/wdm/usb/driver/usbser/utils.c

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/***************************************************************************
Copyright (c) 1998 Microsoft Corporation
Module Name:
UTILS.C
Abstract:
Routines that don't fit anywhere else.
Environment:
kernel mode only
Notes:
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
PURPOSE.
Copyright (c) 1998 Microsoft Corporation. All Rights Reserved.
Revision History:
12/23/97 : created
Authors:
Tom Green
****************************************************************************/
#include <wdm.h>
#include <ntddser.h>
#include <stdio.h>
#include <stdlib.h>
#include <usb.h>
#include <usbdrivr.h>
#include <usbdlib.h>
#include <usbcomm.h>
#ifdef WMI_SUPPORT
#include <wmilib.h>
#include <wmidata.h>
#include <wmistr.h>
#endif
#include "usbser.h"
#include "usbserpw.h"
#include "serioctl.h"
#include "utils.h"
#include "debugwdm.h"
#ifdef ALLOC_PRAGMA
#if DBG
#pragma alloc_text(PAGEUBS0, UsbSerLockPagableCodeSection)
#endif
#pragma alloc_text(PAGEUBS0, UsbSerGetRegistryKeyValue)
#pragma alloc_text(PAGEUBS0, UsbSerUndoExternalNaming)
#pragma alloc_text(PAGEUBS0, UsbSerDoExternalNaming)
#pragma alloc_text(PAGEUBS0, StopDevice)
#pragma alloc_text(PAGEUBS0, StartPerfTimer)
#pragma alloc_text(PAGEUBS0, StopPerfTimer)
#pragma alloc_text(PAGEUBS0, BytesPerSecond)
#pragma alloc_text(PAGEUBS0, CallUSBD)
#pragma alloc_text(PAGEUBS0, ConfigureDevice)
#pragma alloc_text(PAGEUBS0, BuildRequest)
// #pragma alloc_text(PAGEUBS0, BuildReadRequest) -- called from restartnotify
#pragma alloc_text(PAGEUBS0, ClassVendorCommand)
#pragma alloc_text(PAGEUBS0, StartRead)
#pragma alloc_text(PAGEUBS0, StartNotifyRead)
#pragma alloc_text(PAGEUBS0, UsbSerRestoreModemSettings)
#pragma alloc_text(PAGEUBS0, StartDevice)
#pragma alloc_text(PAGEUBS0, DeleteObjectAndLink)
#pragma alloc_text(PAGEUBS0, RemoveDevice)
// #pragma alloc_text(PAGEUSBS, CancelPendingWaitMasks) -- called from STOP
#pragma alloc_text(PAGEUSBS, UsbSerTryToCompleteCurrent)
#pragma alloc_text(PAGEUSBS, UsbSerGetNextIrp)
#pragma alloc_text(PAGEUSBS, UsbSerStartOrQueue)
#pragma alloc_text(PAGEUSBS, UsbSerCancelQueued)
#pragma alloc_text(PAGEUSBS, UsbSerKillAllReadsOrWrites)
#pragma alloc_text(PAGEUSBS, UsbSerKillPendingIrps)
#pragma alloc_text(PAGEUSBS, UsbSerCompletePendingWaitMasks)
#pragma alloc_text(PAGEUSBS, UsbSerProcessEmptyTransmit)
#pragma alloc_text(PAGEUSBS, UsbSerCancelWaitOnMask)
#endif // ALLOC_PRAGMA
// we will support 256 devices, keep track of open slots here
#define NUM_DEVICE_SLOTS 256
LOCAL BOOLEAN Slots[NUM_DEVICE_SLOTS];
LOCAL ULONG NumDevices;
LOCAL PDEVICE_OBJECT GlobDeviceObject;
USHORT RxBuffSize = RX_BUFF_SIZE;
/************************************************************************/
/* UsbSerGetRegistryValues */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Gets values from the registry */
/* */
/* Arguments: */
/* */
/* Handle Handle to the opened registry key */
/* */
/* PKeyNameString ANSI string to the desired key */
/* */
/* KeyNameStringLength Length of the KeyNameString */
/* */
/* PData Buffer to place the key value in */
/* */
/* DataLength Length of the data buffer */
/* */
/* PDevExt - pointer to the device extension */
/* */
/* Return Value: */
/* */
/* STATUS_SUCCESS if all works, otherwise status of system call that */
/* went wrong. */
/* */
/************************************************************************/
NTSTATUS
UsbSerGetRegistryKeyValue(IN HANDLE Handle, IN PWCHAR PKeyNameString,
IN ULONG KeyNameStringLength, IN PVOID PData,
IN ULONG DataLength)
{
UNICODE_STRING keyName;
ULONG length;
PKEY_VALUE_FULL_INFORMATION pFullInfo;
NTSTATUS status = STATUS_INSUFFICIENT_RESOURCES;
PAGED_CODE();
DEBUG_LOG_PATH("enter UsbSerGetRegistryKeyValue");
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerGetRegistryKeyValue\n"));
RtlInitUnicodeString(&keyName, PKeyNameString);
length = sizeof(KEY_VALUE_FULL_INFORMATION) + KeyNameStringLength
+ DataLength;
pFullInfo = DEBUG_MEMALLOC(PagedPool, length);
if (pFullInfo) {
status = ZwQueryValueKey(Handle, &keyName,
KeyValueFullInformation, pFullInfo,
length, &length);
if (NT_SUCCESS(status)) {
//
// If there is enough room in the data buffer,
// copy the output
//
if (DataLength >= pFullInfo->DataLength) {
RtlCopyMemory(PData, ((PUCHAR)pFullInfo)
+ pFullInfo->DataOffset,
pFullInfo->DataLength);
}
}
DEBUG_MEMFREE(pFullInfo);
}
DEBUG_LOG_ERROR(status);
DEBUG_LOG_PATH("exit UsbSerGetRegistryKeyValue");
DEBUG_TRACE3(("status (%08X)\n", status));
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerGetRegistryKeyValue %08X\n",
status));
return status;
} // UsbSerGetRegistryKeyValue
/************************************************************************/
/* UsbSerUndoExternalNaming */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Remove any and all external namespace interfaces we exposed */
/* */
/* Arguments: */
/* */
/* PDevExt - pointer to the device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
UsbSerUndoExternalNaming(IN PDEVICE_EXTENSION PDevExt)
{
PAGED_CODE();
DEBUG_LOG_PATH("enter UsbSerUndoExternalNaming");
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerUndoExternalNaming\n"));
if (PDevExt->SymbolicLinkName.Buffer && PDevExt->CreatedSymbolicLink) {
IoDeleteSymbolicLink(&PDevExt->SymbolicLinkName);
}
if (PDevExt->SymbolicLinkName.Buffer != NULL) {
DEBUG_MEMFREE(PDevExt->SymbolicLinkName.Buffer);
RtlInitUnicodeString(&PDevExt->SymbolicLinkName, NULL);
}
if (PDevExt->DosName.Buffer != NULL) {
DEBUG_MEMFREE(PDevExt->DosName.Buffer);
RtlInitUnicodeString(&PDevExt->DosName, NULL);
}
if (PDevExt->DeviceName.Buffer != NULL) {
RtlDeleteRegistryValue(RTL_REGISTRY_DEVICEMAP, SERIAL_DEVICE_MAP,
PDevExt->DeviceName.Buffer);
DEBUG_MEMFREE(PDevExt->DeviceName.Buffer);
RtlInitUnicodeString(&PDevExt->DeviceName, NULL);
}
#ifdef WMI_SUPPORT
if (PDevExt->WmiIdentifier.Buffer)
{
DEBUG_MEMFREE(PDevExt->WmiIdentifier.Buffer);
PDevExt->WmiIdentifier.MaximumLength
= PDevExt->WmiIdentifier.Length = 0;
PDevExt->WmiIdentifier.Buffer = NULL;
}
#endif
DEBUG_LOG_PATH("exit UsbSerUndoExternalNaming");
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerUndoExternalNaming\n"));
} // UsbSerUndoExternalNaming
/************************************************************************/
/* UsbSerDoExternalNaming */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Exposes interfaces in external namespace */
/* */
/* Arguments: */
/* */
/* PDevExt - pointer to the device extension */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
UsbSerDoExternalNaming(IN PDEVICE_EXTENSION PDevExt)
{
NTSTATUS status;
HANDLE keyHandle;
WCHAR *pRegName = NULL;
UNICODE_STRING linkName;
PAGED_CODE();
DEBUG_LOG_PATH("enter UsbSerDoExternalNaming");
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerDoExternalNaming\n"));
RtlZeroMemory(&linkName, sizeof(UNICODE_STRING));
linkName.MaximumLength = SYMBOLIC_NAME_LENGTH * sizeof(WCHAR);
linkName.Buffer = DEBUG_MEMALLOC(PagedPool, linkName.MaximumLength
+ sizeof(WCHAR));
if (linkName.Buffer == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
goto UsbSerDoExternalNamingError;
}
RtlZeroMemory(linkName.Buffer, linkName.MaximumLength + sizeof(WCHAR));
pRegName = DEBUG_MEMALLOC(PagedPool, SYMBOLIC_NAME_LENGTH * sizeof(WCHAR)
+ sizeof(WCHAR));
if (pRegName == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
goto UsbSerDoExternalNamingError;
}
status = IoOpenDeviceRegistryKey(PDevExt->PhysDeviceObject,
PLUGPLAY_REGKEY_DEVICE,
STANDARD_RIGHTS_READ, &keyHandle);
if (status != STATUS_SUCCESS) {
goto UsbSerDoExternalNamingError;
}
status = UsbSerGetRegistryKeyValue(keyHandle, L"PortName", sizeof(L"PortName"),
pRegName, SYMBOLIC_NAME_LENGTH * sizeof(WCHAR));
if (status != STATUS_SUCCESS) {
status = UsbSerGetRegistryKeyValue(keyHandle, L"Identifier",
sizeof(L"Identifier"), pRegName,
SYMBOLIC_NAME_LENGTH * sizeof(WCHAR));
if (status != STATUS_SUCCESS) {
ZwClose(keyHandle);
goto UsbSerDoExternalNamingError;
}
}
ZwClose(keyHandle);
#ifdef WMI_SUPPORT
{
ULONG bufLen;
bufLen = wcslen(pRegName) * sizeof(WCHAR) + sizeof(UNICODE_NULL);
PDevExt->WmiIdentifier.Buffer = DEBUG_MEMALLOC(PagedPool, bufLen);
if (PDevExt->WmiIdentifier.Buffer == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
goto UsbSerDoExternalNamingError;
}
RtlZeroMemory(PDevExt->WmiIdentifier.Buffer, bufLen);
PDevExt->WmiIdentifier.Length = 0;
PDevExt->WmiIdentifier.MaximumLength = (USHORT)bufLen - sizeof(WCHAR);
RtlAppendUnicodeToString(&PDevExt->WmiIdentifier, pRegName);
}
#endif
//
// Create the "\\DosDevices\\<symbolicname>" string
//
RtlAppendUnicodeToString(&linkName, L"\\");
RtlAppendUnicodeToString(&linkName, DEFAULT_DIRECTORY);
RtlAppendUnicodeToString(&linkName, L"\\");
RtlAppendUnicodeToString(&linkName, pRegName);
//
// Allocate pool and save the symbolic link name in the device extension
//
PDevExt->SymbolicLinkName.MaximumLength = linkName.Length + sizeof(WCHAR);
PDevExt->SymbolicLinkName.Buffer
= DEBUG_MEMALLOC(PagedPool, PDevExt->SymbolicLinkName.MaximumLength);
if (PDevExt->SymbolicLinkName.Buffer == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
goto UsbSerDoExternalNamingError;
}
RtlZeroMemory(PDevExt->SymbolicLinkName.Buffer,
PDevExt->SymbolicLinkName.MaximumLength);
RtlAppendUnicodeStringToString(&PDevExt->SymbolicLinkName, &linkName);
status = IoCreateSymbolicLink(&PDevExt->SymbolicLinkName,
&PDevExt->DeviceName);
if (status != STATUS_SUCCESS) {
goto UsbSerDoExternalNamingError;
}
PDevExt->CreatedSymbolicLink = TRUE;
PDevExt->DosName.Buffer = DEBUG_MEMALLOC(PagedPool, 64 + sizeof(WCHAR));
if (PDevExt->DosName.Buffer == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
goto UsbSerDoExternalNamingError;
}
PDevExt->DosName.MaximumLength = 64 + sizeof(WCHAR);
PDevExt->DosName.Length = 0;
RtlZeroMemory(PDevExt->DosName.Buffer, PDevExt->DosName.MaximumLength);
RtlAppendUnicodeToString(&PDevExt->DosName, pRegName);
RtlZeroMemory(((PUCHAR)(&PDevExt->DosName.Buffer[0]))
+ PDevExt->DosName.Length, sizeof(WCHAR));
status = RtlWriteRegistryValue(RTL_REGISTRY_DEVICEMAP, L"SERIALCOMM",
PDevExt->DeviceName.Buffer, REG_SZ,
PDevExt->DosName.Buffer,
PDevExt->DosName.Length + sizeof(WCHAR));
if (status != STATUS_SUCCESS) {
goto UsbSerDoExternalNamingError;
}
UsbSerDoExternalNamingError:;
//
// Clean up error conditions
//
if (status != STATUS_SUCCESS) {
if (PDevExt->DosName.Buffer != NULL) {
DEBUG_MEMFREE(PDevExt->DosName.Buffer);
PDevExt->DosName.Buffer = NULL;
}
if (PDevExt->CreatedSymbolicLink == TRUE) {
IoDeleteSymbolicLink(&PDevExt->SymbolicLinkName);
PDevExt->CreatedSymbolicLink = FALSE;
}
if (PDevExt->SymbolicLinkName.Buffer != NULL) {
DEBUG_MEMFREE(PDevExt->SymbolicLinkName.Buffer);
PDevExt->SymbolicLinkName.Buffer = NULL;
}
if (PDevExt->DeviceName.Buffer != NULL) {
RtlDeleteRegistryValue(RTL_REGISTRY_DEVICEMAP, SERIAL_DEVICE_MAP,
PDevExt->DeviceName.Buffer);
}
}
//
// Always clean up our temp buffers.
//
if (linkName.Buffer != NULL) {
DEBUG_MEMFREE(linkName.Buffer);
}
if (pRegName != NULL) {
DEBUG_MEMFREE(pRegName);
}
DEBUG_LOG_ERROR(status);
DEBUG_LOG_PATH("exit UsbSerDoExternalNaming");
DEBUG_TRACE3(("status (%08X)\n", status));
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerDoExternalNaming %08X\n", status));
return status;
} // UsbSerDoExternalNaming
NTSTATUS
UsbSerAbortPipes(IN PDEVICE_OBJECT PDevObj)
/*++
Routine Description:
Called as part of sudden device removal handling.
Cancels any pending transfers for all open pipes.
Arguments:
Ptrs to our FDO
Return Value:
NT status code
--*/
{
NTSTATUS ntStatus = STATUS_SUCCESS;
PURB pUrb;
PDEVICE_EXTENSION pDevExt;
ULONG pendingIrps;
DEBUG_TRACE1(("UsbSerAbortPipes\n"));
UsbSerSerialDump(USBSERTRACEOTH | USBSERTRACERD,
(">UsbSerAbortPipes (%08X)\n", PDevObj));
pDevExt = PDevObj->DeviceExtension;
pUrb = DEBUG_MEMALLOC(NonPagedPool, sizeof(struct _URB_PIPE_REQUEST));
if (pUrb != NULL)
{
pUrb->UrbHeader.Length = (USHORT)sizeof(struct _URB_PIPE_REQUEST);
pUrb->UrbHeader.Function = URB_FUNCTION_ABORT_PIPE;
pUrb->UrbPipeRequest.PipeHandle = pDevExt->DataInPipe;
ntStatus = CallUSBD(PDevObj, pUrb);
if (ntStatus != STATUS_SUCCESS) {
goto UsbSerAbortPipesErr;
}
//
// Wait for all the read IRPS to drain
//
UsbSerSerialDump(USBSERTRACERD, ("DataInCountw %08X @ %08X\n",
pDevExt->PendingDataInCount,
&pDevExt->PendingDataInCount));
//
// Decrement for initial value
//
pendingIrps = InterlockedDecrement(&pDevExt->PendingDataInCount);
if (pendingIrps) {
DEBUG_TRACE1(("Abort DataIn Pipe\n"));
UsbSerSerialDump(USBSERTRACEOTH, ("Waiting for DataIn Pipe\n"));
KeWaitForSingleObject(&pDevExt->PendingDataInEvent, Executive,
KernelMode, FALSE, NULL);
}
//
// Reset counter
//
InterlockedIncrement(&pDevExt->PendingDataInCount);
UsbSerSerialDump(USBSERTRACERD, ("DataInCountx %08X @ %08X\n",
pDevExt->PendingDataInCount,
&pDevExt->PendingDataInCount));
pUrb->UrbHeader.Length = (USHORT)sizeof(struct _URB_PIPE_REQUEST);
pUrb->UrbHeader.Function = URB_FUNCTION_ABORT_PIPE;
pUrb->UrbPipeRequest.PipeHandle = pDevExt->DataOutPipe;
ntStatus = CallUSBD(PDevObj, pUrb);
if (ntStatus != STATUS_SUCCESS) {
goto UsbSerAbortPipesErr;
}
//
// Wait for all the write irps to drain
//
//
// Decrement for initial value
//
pendingIrps = InterlockedDecrement(&pDevExt->PendingDataOutCount);
if (pendingIrps) {
UsbSerSerialDump(USBSERTRACEOTH, ("Waiting for DataOut Pipe\n"));
KeWaitForSingleObject(&pDevExt->PendingDataOutEvent, Executive,
KernelMode, FALSE, NULL);
}
//
// Reset counter
//
InterlockedIncrement(&pDevExt->PendingDataOutCount);
pUrb->UrbHeader.Length = (USHORT)sizeof(struct _URB_PIPE_REQUEST);
pUrb->UrbHeader.Function = URB_FUNCTION_ABORT_PIPE;
pUrb->UrbPipeRequest.PipeHandle = pDevExt->NotificationPipe;
ntStatus = CallUSBD(PDevObj, pUrb);
//
// Wait for all the notify irps to drain
//
//
// Decrement for initial value
//
pendingIrps = InterlockedDecrement(&pDevExt->PendingNotifyCount);
if (pendingIrps) {
UsbSerSerialDump(USBSERTRACEOTH, ("Waiting for Notify Pipe\n"));
KeWaitForSingleObject(&pDevExt->PendingNotifyEvent, Executive,
KernelMode, FALSE, NULL);
}
// //
// Die my darling, die.
//
// IoCancelIrp(pDevExt->NotifyIrp);
// Reset counter
//
InterlockedIncrement(&pDevExt->PendingNotifyCount);
UsbSerAbortPipesErr:;
DEBUG_MEMFREE(pUrb);
} else {
ntStatus = STATUS_INSUFFICIENT_RESOURCES;
}
UsbSerSerialDump(USBSERTRACEOTH | USBSERTRACERD,
("<UsbSerAbortPipes %08X\n", ntStatus));
return ntStatus;
}
/************************************************************************/
/* StartDevice */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Take care of processing needed to start device. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* Irp - pointer to an I/O Request Packet */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
StartDevice(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
NTSTATUS NtStatus = STATUS_SUCCESS;
KEVENT Event;
PVOID pPagingHandle;
PAGED_CODE();
DEBUG_LOG_PATH("enter StartDevice");
DEBUG_TRACE1(("StartDevice\n"));
// pass this down to the USB stack first
KeInitializeEvent(&Event, NotificationEvent, FALSE);
//
// Initialize our DPC's
//
KeInitializeDpc(&DeviceExtension->TotalReadTimeoutDpc,
UsbSerReadTimeout, DeviceExtension);
KeInitializeDpc(&DeviceExtension->IntervalReadTimeoutDpc,
UsbSerIntervalReadTimeout, DeviceExtension);
KeInitializeDpc(&DeviceExtension->TotalWriteTimeoutDpc,
UsbSerWriteTimeout, DeviceExtension);
//
// Initialize timers
//
KeInitializeTimer(&DeviceExtension->WriteRequestTotalTimer);
KeInitializeTimer(&DeviceExtension->ReadRequestTotalTimer);
KeInitializeTimer(&DeviceExtension->ReadRequestIntervalTimer);
//
// Store values into the extension for interval timing.
//
//
// If the interval timer is less than a second then come
// in with a short "polling" loop.
//
// For large (> then 2 seconds) use a 1 second poller.
//
DeviceExtension->ShortIntervalAmount.QuadPart = -1;
DeviceExtension->LongIntervalAmount.QuadPart = -10000000;
DeviceExtension->CutOverAmount.QuadPart = 200000000;
KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
IoCopyCurrentIrpStackLocationToNext(Irp);
IoSetCompletionRoutine(Irp, UsbSerSyncCompletion, &Event, TRUE, TRUE,
TRUE);
NtStatus = IoCallDriver(DeviceExtension->StackDeviceObject, Irp);
// wait for Irp to complete if status is pending
if(NtStatus == STATUS_PENDING)
{
KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE,
NULL);
}
NtStatus = Irp->IoStatus.Status;
if (!NT_SUCCESS(NtStatus)) {
goto ExitStartDevice;
}
NtStatus = GetDeviceDescriptor(DeviceObject);
if (!NT_SUCCESS(NtStatus)) {
goto ExitStartDevice;
}
NtStatus = ConfigureDevice(DeviceObject);
if (!NT_SUCCESS(NtStatus)) {
goto ExitStartDevice;
}
//
// Page in and lock necessary code
//
pPagingHandle = UsbSerLockPagableCodeSection(PAGEUSBSER_Function);
// reset device
ResetDevice(NULL, DeviceObject);
// init stuff in device extension
DeviceExtension->HandFlow.ControlHandShake = 0;
DeviceExtension->HandFlow.FlowReplace = SERIAL_RTS_CONTROL;
DeviceExtension->AcceptingRequests = TRUE;
InitializeListHead(&DeviceExtension->ReadQueue);
InitializeListHead(&DeviceExtension->ImmediateReadQueue);
UsbSerDoExternalNaming(DeviceExtension);
// clear DTR and RTS
SetClrDtr(DeviceObject, FALSE);
ClrRts(NULL, DeviceExtension);
// kick off a read
StartRead(DeviceExtension);
// kick off a notification read
StartNotifyRead(DeviceExtension);
UsbSerUnlockPagableImageSection(pPagingHandle);
ExitStartDevice:;
if(NT_SUCCESS(NtStatus))
{
DeviceExtension->DeviceState = DEVICE_STATE_STARTED;
// try and idle the modem
// UsbSerFdoSubmitIdleRequestIrp(DeviceExtension);
}
Irp->IoStatus.Status = NtStatus;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
DEBUG_LOG_PATH("exit StartDevice");
return NtStatus;
} // StartDevice
/************************************************************************/
/* StopDevice */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Take care of processing needed to stop device. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* Irp - pointer to an I/O Request Packet */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
StopDevice(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
NTSTATUS NtStatus = STATUS_SUCCESS;
ULONG Size;
PURB Urb;
PAGED_CODE();
DEBUG_LOG_PATH("enter StopDevice");
DEBUG_TRACE1(("StopDevice\n"));
UsbSerFetchBooleanLocked(&DeviceExtension->AcceptingRequests,
FALSE, &DeviceExtension->ControlLock);
CancelPendingWaitMasks(DeviceExtension);
if(DeviceExtension->DeviceState == DEVICE_STATE_STARTED)
{
DEBUG_TRACE1(("AbortPipes\n"));
UsbSerAbortPipes(DeviceObject);
}
DeviceExtension->DeviceState = DEVICE_STATE_STOPPED;
if(DeviceExtension->PendingIdleIrp)
{
IoCancelIrp(DeviceExtension->PendingIdleIrp);
}
Size = sizeof(struct _URB_SELECT_CONFIGURATION);
Urb = DEBUG_MEMALLOC(NonPagedPool, Size);
if(Urb)
{
UsbBuildSelectConfigurationRequest(Urb, (USHORT) Size, NULL);
NtStatus = CallUSBD(DeviceObject, Urb);
DEBUG_TRACE3(("Device Configuration Closed status = (%08X) "
"USB status = (%08X)\n", NtStatus,
Urb->UrbHeader.Status));
DEBUG_MEMFREE(Urb);
}
else
{
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
}
DEBUG_LOG_PATH("exit StopDevice");
return NtStatus;
} // StopDevice
/************************************************************************/
/* RemoveDevice */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Take care of processing needed to remove device. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* Irp - pointer to an I/O Request Packet */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
RemoveDevice(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
NTSTATUS NtStatus = STATUS_SUCCESS;
PVOID pPagingHandle;
PAGED_CODE();
DEBUG_LOG_PATH("enter RemoveDevice");
DEBUG_TRACE1(("RemoveDevice\n"));
//
// Page in and lock necessary code
//
pPagingHandle = UsbSerLockPagableCodeSection(PAGEUSBSER_Function);
UsbSerFetchBooleanLocked(&DeviceExtension->AcceptingRequests,
FALSE, &DeviceExtension->ControlLock);
CancelPendingWaitMasks(DeviceExtension);
//
// Cancel all pending USB transactions
//
if(DeviceExtension->DeviceState == DEVICE_STATE_STARTED)
{
DEBUG_TRACE1(("AbortPipes\n"));
UsbSerAbortPipes(DeviceObject);
}
//
// Once we set accepting requests to false, we shouldn't
// have any more contention here -- if we do, we're dead
// because we're freeing memory out from under our feet.
//
DEBUG_TRACE1(("Freeing Allocated Memory\n"));
// free allocated notify URB
if(DeviceExtension->NotifyUrb)
{
DEBUG_MEMFREE(DeviceExtension->NotifyUrb);
DeviceExtension->NotifyUrb = NULL;
}
// free allocated Read URB
if(DeviceExtension->ReadUrb)
{
DEBUG_MEMFREE(DeviceExtension->ReadUrb);
DeviceExtension->ReadUrb = NULL;
}
// free allocated device descriptor
if(DeviceExtension->DeviceDescriptor)
{
DEBUG_MEMFREE(DeviceExtension->DeviceDescriptor);
DeviceExtension->DeviceDescriptor = NULL;
}
// free up read buffer
if(DeviceExtension->ReadBuff)
{
DEBUG_MEMFREE(DeviceExtension->ReadBuff);
DeviceExtension->ReadBuff = NULL;
}
if(DeviceExtension->USBReadBuff)
{
DEBUG_MEMFREE(DeviceExtension->USBReadBuff);
DeviceExtension->USBReadBuff = NULL;
}
// free up notification buffer
if(DeviceExtension->NotificationBuff)
{
DEBUG_MEMFREE(DeviceExtension->NotificationBuff);
DeviceExtension->NotificationBuff = NULL;
}
DEBUG_TRACE1(("Undo Serial Name\n"));
UsbSerUndoExternalNaming(DeviceExtension);
//
// Pass this down to the next driver
IoCopyCurrentIrpStackLocationToNext(Irp);
NtStatus = IoCallDriver(DeviceExtension->StackDeviceObject, Irp);
DEBUG_TRACE1(("Detach Device\n"));
// detach device from stack
IoDetachDevice(DeviceExtension->StackDeviceObject);
DEBUG_TRACE1(("DevExt (%08X) DevExt Size (%08X)\n", DeviceExtension, sizeof(DEVICE_EXTENSION)));
DEBUG_TRACE1(("Delete Object and Link\n"));
// delete device object and symbolic link
DeleteObjectAndLink(DeviceObject);
DEBUG_TRACE1(("Done Removing Device\n"));
DEBUG_LOG_PATH("exit RemoveDevice");
UsbSerUnlockPagableImageSection(pPagingHandle);
DeviceExtension->DeviceState = DEVICE_STATE_STOPPED;
return NtStatus;
} // RemoveDevice
/************************************************************************/
/* CreateDeviceObject */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Take care of processing needed to create device obeject for */
/* device. */
/* */
/* Arguments: */
/* */
/* DriverObject - pointer to a driver object */
/* DeviceObject - pointer to a device object pointer */
/* DeviceName - pointer to a base name of device */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
CreateDeviceObject(IN PDRIVER_OBJECT DriverObject,
IN PDEVICE_OBJECT *DeviceObject,
IN PCHAR DeviceName)
{
ANSI_STRING DevName;
ANSI_STRING LinkName;
NTSTATUS NtStatus;
UNICODE_STRING DeviceNameUnicodeString;
UNICODE_STRING LinkNameUnicodeString;
PDEVICE_EXTENSION DeviceExtension;
CHAR DeviceLinkBuffer[NAME_MAX];
CHAR DeviceNameBuffer[NAME_MAX];
ULONG DeviceInstance;
ULONG bufferLen;
KIRQL OldIrql;
DEBUG_LOG_PATH("enter CreateDeviceObject");
DEBUG_TRACE1(("CreateDeviceObject\n"));
KeAcquireSpinLock(&GlobalSpinLock, &OldIrql);
// let's get an instance
for (DeviceInstance = 0; DeviceInstance < NUM_DEVICE_SLOTS;
DeviceInstance++) {
if (Slots[DeviceInstance] == FALSE)
break;
}
KeReleaseSpinLock(&GlobalSpinLock, OldIrql);
// check if we didn't have any empty slots
if (DeviceInstance == NUM_DEVICE_SLOTS)
NtStatus = STATUS_INVALID_DEVICE_REQUEST;
else {
// complete names of links and devices
sprintf(DeviceLinkBuffer, "%s%s%03d", "\\DosDevices\\", DeviceName,
DeviceInstance);
sprintf(DeviceNameBuffer, "%s%s%03d", "\\Device\\", DeviceName,
DeviceInstance);
// init ANSI string with our link and device names
RtlInitAnsiString(&DevName, DeviceNameBuffer);
RtlInitAnsiString(&LinkName, DeviceLinkBuffer);
DeviceNameUnicodeString.Length = 0;
DeviceNameUnicodeString.Buffer = NULL;
LinkNameUnicodeString.Length = 0;
LinkNameUnicodeString.Buffer = NULL;
*DeviceObject = NULL;
// convert to UNICODE string
NtStatus = RtlAnsiStringToUnicodeString(&DeviceNameUnicodeString,
&DevName, TRUE);
if(NT_SUCCESS(NtStatus))
{
NtStatus = RtlAnsiStringToUnicodeString(&LinkNameUnicodeString,
&LinkName, TRUE);
if(NT_SUCCESS(NtStatus))
{
DEBUG_TRACE3(("Create Device (%s)\n", DeviceNameBuffer));
// create the device object
NtStatus = IoCreateDevice(DriverObject, sizeof(DEVICE_EXTENSION),
&DeviceNameUnicodeString,
FILE_DEVICE_MODEM, 0, TRUE,
DeviceObject);
} else {
goto CreateDeviceObjectError;
}
} else {
goto CreateDeviceObjectError;
}
// created the device object O.K., create symbolic links,
// attach device object, and fill in the device extension
if (NT_SUCCESS(NtStatus)) {
// create symbolic links
DEBUG_TRACE3(("Create SymLink (%s)\n", DeviceLinkBuffer));
NtStatus = IoCreateUnprotectedSymbolicLink(&LinkNameUnicodeString,
&DeviceNameUnicodeString);
if (NtStatus != STATUS_SUCCESS) {
goto CreateDeviceObjectError;
}
// get pointer to device extension
DeviceExtension = (PDEVICE_EXTENSION) (*DeviceObject)->DeviceExtension;
// let's zero out device extension
RtlZeroMemory(DeviceExtension, sizeof(DEVICE_EXTENSION));
// save our strings
// save link name
strcpy(DeviceExtension->LinkName, DeviceLinkBuffer);
bufferLen = RtlAnsiStringToUnicodeSize(&DevName);
DeviceExtension->DeviceName.Length = 0;
DeviceExtension->DeviceName.MaximumLength = (USHORT)bufferLen;
DeviceExtension->DeviceName.Buffer = DEBUG_MEMALLOC(PagedPool,
bufferLen);
if (DeviceExtension->DeviceName.Buffer == NULL) {
//
// Skip out. We have worse problems than missing
// the name.
//
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
goto CreateDeviceObjectError;
} else {
RtlAnsiStringToUnicodeString(&DeviceExtension->DeviceName, &DevName,
FALSE);
// save physical device object
DeviceExtension->PhysDeviceObject = *DeviceObject;
DeviceExtension->Instance = DeviceInstance;
// initialize spinlocks
KeInitializeSpinLock(&DeviceExtension->ControlLock);
// mark this device slot as in use and increment number
// of devices
KeAcquireSpinLock(&GlobalSpinLock, &OldIrql);
Slots[DeviceInstance] = TRUE;
NumDevices++;
KeReleaseSpinLock(&GlobalSpinLock, OldIrql);
DeviceExtension->IsDevice = TRUE;
KeInitializeEvent(&DeviceExtension->PendingDataInEvent,
SynchronizationEvent, FALSE);
KeInitializeEvent(&DeviceExtension->PendingDataOutEvent,
SynchronizationEvent, FALSE);
KeInitializeEvent(&DeviceExtension->PendingNotifyEvent,
SynchronizationEvent, FALSE);
KeInitializeEvent(&DeviceExtension->PendingFlushEvent,
SynchronizationEvent, FALSE);
DeviceExtension->PendingDataInCount = 1;
DeviceExtension->PendingDataOutCount = 1;
DeviceExtension->PendingNotifyCount = 1;
DeviceExtension->SanityCheck = SANITY_CHECK;
}
}
CreateDeviceObjectError:;
// free Unicode strings
RtlFreeUnicodeString(&DeviceNameUnicodeString);
RtlFreeUnicodeString(&LinkNameUnicodeString);
//
// Delete the devobj if there was an error
//
if (NtStatus != STATUS_SUCCESS) {
if (*DeviceObject) {
IoDeleteDevice(*DeviceObject);
*DeviceObject = NULL;
}
}
}
// log an error if we got one
DEBUG_LOG_ERROR(NtStatus);
DEBUG_LOG_PATH("exit CreateDeviceObject");
DEBUG_TRACE3(("status (%08X)\n", NtStatus));
return NtStatus;
} // CreateDeviceObject
/************************************************************************/
/* CompleteIO */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Complete IO request and log IRP */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to device object. */
/* Irp - pointer to IRP. */
/* MajorFunction - major function of IRP. */
/* IoBuffer - buffer for data passed in and out of driver. */
/* BufferLen - length of buffer */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
CompleteIO(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN ULONG MajorFunction,
IN PVOID IoBuffer, IN ULONG_PTR BufferLen)
{
PDEVICE_EXTENSION DeviceExtension;
DEBUG_LOG_PATH("enter CompleteIO");
// get pointer to device extension
DeviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
// log IRP count and bytes processed in device extension
DeviceExtension->IRPCount++;
DeviceExtension->ByteCount
= RtlLargeIntegerAdd(DeviceExtension->ByteCount,
RtlConvertUlongToLargeInteger((ULONG)Irp->IoStatus
.Information));
// make entry in IRP history table
DEBUG_LOG_IRP_HIST(DeviceObject, Irp, MajorFunction, IoBuffer,
(ULONG)BufferLen);
// if we got here, must want to complete request on IRP
IoCompleteRequest(Irp, IO_NO_INCREMENT);
DEBUG_LOG_PATH("exit CompleteIO");
} // CompleteIO
/************************************************************************/
/* DeleteObjectAndLink */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Deletes a device object and associated symbolic link */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to device object. */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
DeleteObjectAndLink(IN PDEVICE_OBJECT DeviceObject)
{
PDEVICE_EXTENSION DeviceExtension;
UNICODE_STRING DeviceLinkUnicodeString;
ANSI_STRING DeviceLinkAnsiString;
NTSTATUS NtStatus;
PAGED_CODE();
DEBUG_LOG_PATH("enter DeleteObjectAndLink");
DEBUG_TRACE1(("DeleteObjectAndLink\n"));
// get pointer to device extension, we will get the symbolic link name
// here
DeviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
// get rid of the symbolic link
RtlInitAnsiString(&DeviceLinkAnsiString, DeviceExtension->LinkName);
NtStatus = RtlAnsiStringToUnicodeString(&DeviceLinkUnicodeString,
&DeviceLinkAnsiString, TRUE);
DEBUG_TRACE1(("Delete Symbolic Link\n"));
IoDeleteSymbolicLink(&DeviceLinkUnicodeString);
// clear out slot and decrement number of devices
if(DeviceExtension->Instance < NUM_DEVICE_SLOTS)
{
UsbSerFetchBooleanLocked(&Slots[DeviceExtension->Instance],
FALSE, &GlobalSpinLock);
NumDevices--;
if(!NumDevices)
DEBUG_CHECKMEM();
}
DEBUG_TRACE1(("Delete Device Object\n"));
if(DeviceExtension->SanityCheck != SANITY_CHECK)
{
DEBUG_TRACE1(("Device Extension Scrozzled\n"));
}
// wait to do this till here as this triggers unload routine
IoDeleteDevice(DeviceObject);
DEBUG_TRACE1(("Done Deleting Device Object and Link\n"));
DEBUG_LOG_PATH("exit DeleteObjectAndLink");
return NtStatus;
} // DeleteObjectAndLink
/************************************************************************/
/* StartPerfTimer */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Start perf timer for measuring bytes/second throughput */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to device extension for device */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
StartPerfTimer(IN OUT PDEVICE_EXTENSION DeviceExtension)
{
PAGED_CODE();
// set up perf stuff if perf timing enabled
if(DeviceExtension && DeviceExtension->PerfTimerEnabled)
{
// get current perf counter
DeviceExtension->TimerStart = KeQueryPerformanceCounter(NULL);
}
} // StartPerfTimer
/************************************************************************/
/* StopPerfTimer */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Stop perf timer for measuring bytes/second throughput */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to device extension for device */
/* BytesXfered - number of bytes tranferred this iteration */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
StopPerfTimer(IN OUT PDEVICE_EXTENSION DeviceExtension,
IN ULONG BytesXfered)
{
LARGE_INTEGER BytesThisTransfer;
LARGE_INTEGER CurrentTime;
LARGE_INTEGER TimeThisTransfer;
PAGED_CODE();
if(DeviceExtension && DeviceExtension->PerfTimerEnabled)
{
// get updated time
CurrentTime = KeQueryPerformanceCounter(NULL);
// stop perf timing with system timer
BytesThisTransfer = RtlConvertUlongToLargeInteger(BytesXfered);
DeviceExtension->BytesXfered
= RtlLargeIntegerAdd(DeviceExtension->BytesXfered,
BytesThisTransfer);
// now add the time it took to elapsed time
TimeThisTransfer
= RtlLargeIntegerSubtract(CurrentTime,
DeviceExtension->TimerStart);
DeviceExtension->ElapsedTime
= RtlLargeIntegerAdd(DeviceExtension->ElapsedTime,
TimeThisTransfer);
}
} // StopPerfTimer
/************************************************************************/
/* BytesPerSecond */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Start perf timer for measuring bytes/second throughput */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to device extension for device */
/* */
/* Return Value: */
/* */
/* ULONG - bytes/second for device */
/* */
/************************************************************************/
ULONG
BytesPerSecond(IN OUT PDEVICE_EXTENSION DeviceExtension)
{
ULONG Remainder;
LARGE_INTEGER Result;
LARGE_INTEGER TicksPerSecond;
PAGED_CODE();
// get ticks per second from perf counter
KeQueryPerformanceCounter(&TicksPerSecond);
// scale the bytes xfered
Result = RtlExtendedIntegerMultiply(DeviceExtension->BytesXfered,
TicksPerSecond.LowPart);
// Don't divide by 0
DeviceExtension->ElapsedTime.LowPart
= (DeviceExtension->ElapsedTime.LowPart == 0L) ? 1 :
DeviceExtension->ElapsedTime.LowPart;
// lets get stats here
Result
= RtlExtendedLargeIntegerDivide(Result,
DeviceExtension->ElapsedTime.LowPart,
&Remainder);
return Result.LowPart;
} // BytesPerSecond
/************************************************************************/
/* CallUSBD */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Call USB bus driver. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* Urb - pointer to URB */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
CallUSBD(IN PDEVICE_OBJECT DeviceObject, IN PURB Urb)
{
NTSTATUS NtStatus = STATUS_SUCCESS;
PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
PIRP Irp;
KEVENT Event;
PIO_STACK_LOCATION NextStack;
PAGED_CODE();
DEBUG_LOG_PATH("enter CallUSBD");
// issue a synchronous request
KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
Irp = IoAllocateIrp(DeviceExtension->StackDeviceObject->StackSize, FALSE);
if (Irp == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
// Set the Irp parameters
NextStack = IoGetNextIrpStackLocation(Irp);
NextStack->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
NextStack->Parameters.DeviceIoControl.IoControlCode =
IOCTL_INTERNAL_USB_SUBMIT_URB;
NextStack->Parameters.Others.Argument1 = Urb;
// Set the completion routine, which will signal the event
IoSetCompletionRoutine(Irp,
CallUSBD_SyncCompletionRoutine,
&Event,
TRUE, // InvokeOnSuccess
TRUE, // InvokeOnError
TRUE); // InvokeOnCancel
DEBUG_LOG_PATH("Calling USB driver stack");
NtStatus = IoCallDriver(DeviceExtension->StackDeviceObject, Irp);
DEBUG_LOG_PATH("Returned from calling USB driver stack");
// block on pending request
if(NtStatus == STATUS_PENDING)
{
LARGE_INTEGER timeout;
// Specify a timeout of 30 seconds to wait for this call to complete.
//
timeout.QuadPart = -10000 * 30000;
NtStatus = KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
&timeout);
if(NtStatus == STATUS_TIMEOUT)
{
NtStatus = STATUS_IO_TIMEOUT;
// Cancel the Irp we just sent.
//
IoCancelIrp(Irp);
// And wait until the cancel completes
//
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
}
else
{
NtStatus = Irp->IoStatus.Status;
}
}
IoFreeIrp(Irp);
DEBUG_LOG_PATH("exit CallUSBD");
return NtStatus;
} // CallUSBD
/************************************************************************/
/* CallUSBD_SyncCompletionRoutine */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Completion routine for USB sync request. */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
CallUSBD_SyncCompletionRoutine(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Context)
{
PKEVENT kevent;
kevent = (PKEVENT) Context;
KeSetEvent(kevent, IO_NO_INCREMENT, FALSE);
return STATUS_MORE_PROCESSING_REQUIRED;
} // CallUSBD_SyncCompletionRoutine
/************************************************************************/
/* GetDeviceDescriptor */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Get device descriptor for USB device. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
GetDeviceDescriptor(IN PDEVICE_OBJECT DeviceObject)
{
PDEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
NTSTATUS NtStatus;
PUSB_DEVICE_DESCRIPTOR DeviceDescriptor;
PURB Urb;
ULONG Size;
ULONG UrbCDRSize;
KIRQL OldIrql;
DEBUG_LOG_PATH("enter GetDeviceDescriptor");
UrbCDRSize = sizeof(struct _URB_CONTROL_DESCRIPTOR_REQUEST);
Urb = DEBUG_MEMALLOC(NonPagedPool, UrbCDRSize);
if (Urb) {
Size = sizeof(USB_DEVICE_DESCRIPTOR);
DeviceDescriptor = DEBUG_MEMALLOC(NonPagedPool, Size);
if (DeviceDescriptor) {
UsbBuildGetDescriptorRequest(Urb, (USHORT)UrbCDRSize,
USB_DEVICE_DESCRIPTOR_TYPE, 0, 0,
DeviceDescriptor, NULL, Size, NULL);
NtStatus = CallUSBD(DeviceObject, Urb);
if (NT_SUCCESS(NtStatus)) {
DEBUG_TRACE3(("Device Descriptor (%08X)\n", DeviceDescriptor));
DEBUG_TRACE3(("Length (%08X)\n",
Urb->UrbControlDescriptorRequest
.TransferBufferLength));
DEBUG_TRACE3(("Device Descriptor:\n"));
DEBUG_TRACE3(("-------------------------\n"));
DEBUG_TRACE3(("bLength (%08X)\n",
DeviceDescriptor->bLength));
DEBUG_TRACE3(("bDescriptorType (%08X)\n",
DeviceDescriptor->bDescriptorType));
DEBUG_TRACE3(("bcdUSB (%08X)\n",
DeviceDescriptor->bcdUSB));
DEBUG_TRACE3(("bDeviceClass (%08X)\n",
DeviceDescriptor->bDeviceClass));
DEBUG_TRACE3(("bDeviceSubClass (%08X)\n",
DeviceDescriptor->bDeviceSubClass));
DEBUG_TRACE3(("bDeviceProtocol (%08X)\n",
DeviceDescriptor->bDeviceProtocol));
DEBUG_TRACE3(("bMaxPacketSize0 (%08X)\n",
DeviceDescriptor->bMaxPacketSize0));
DEBUG_TRACE3(("idVendor (%08X)\n",
DeviceDescriptor->idVendor));
DEBUG_TRACE3(("idProduct (%08X)\n",
DeviceDescriptor->idProduct));
DEBUG_TRACE3(("bcdDevice (%08X)\n",
DeviceDescriptor->bcdDevice));
DEBUG_TRACE3(("iManufacturer (%08X)\n",
DeviceDescriptor->iManufacturer));
DEBUG_TRACE3(("iProduct (%08X)\n",
DeviceDescriptor->iProduct));
DEBUG_TRACE3(("iSerialNumber (%08X)\n",
DeviceDescriptor->iSerialNumber));
DEBUG_TRACE3(("bNumConfigurations (%08X)\n",
DeviceDescriptor->bNumConfigurations));
}
} else {
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
}
// save the device descriptor
if (NT_SUCCESS(NtStatus)) {
PVOID pOldDesc = NULL;
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
if (DeviceExtension->DeviceDescriptor) {
pOldDesc = DeviceExtension->DeviceDescriptor;
}
DeviceExtension->DeviceDescriptor = DeviceDescriptor;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
if (pOldDesc != NULL) {
DEBUG_MEMFREE(pOldDesc);
}
} else if (DeviceDescriptor) {
DEBUG_MEMFREE(DeviceDescriptor);
}
DEBUG_MEMFREE(Urb);
} else {
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
}
DEBUG_LOG_PATH("exit GetDeviceDescriptor");
return NtStatus;
} // GetDeviceDescriptor
/************************************************************************/
/* ConfigureDevice */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Initializes USB device and selects configuration. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
ConfigureDevice(IN PDEVICE_OBJECT DeviceObject)
{
PDEVICE_EXTENSION DeviceExtension
= DeviceObject->DeviceExtension;
NTSTATUS NtStatus;
PURB Urb;
ULONG Size;
ULONG UrbCDRSize;
PUSB_CONFIGURATION_DESCRIPTOR ConfigurationDescriptor;
ULONG NumConfigs;
UCHAR Config;
PAGED_CODE();
DEBUG_LOG_PATH("enter ConfigureDevice");
UrbCDRSize = sizeof(struct _URB_CONTROL_DESCRIPTOR_REQUEST);
// first configure the device
Urb = DEBUG_MEMALLOC(NonPagedPool, UrbCDRSize);
if (Urb) {
// there may be problems with the 82930 chip, so make this buffer bigger
// to prevent choking
Size = sizeof(USB_CONFIGURATION_DESCRIPTOR) + 256;
// get the number of configurations
NumConfigs = DeviceExtension->DeviceDescriptor->bNumConfigurations;
// run through all of the configurations looking for a CDC device
for (Config = 0; Config < NumConfigs; Config++) {
// we will probably only do this once, maybe twice
while (TRUE) {
ConfigurationDescriptor = DEBUG_MEMALLOC(NonPagedPool, Size);
if (ConfigurationDescriptor) {
UsbBuildGetDescriptorRequest(Urb, (USHORT)UrbCDRSize,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
Config, 0, ConfigurationDescriptor,
NULL, Size, NULL);
NtStatus = CallUSBD(DeviceObject, Urb);
DEBUG_TRACE3(("Configuration Descriptor (%08X) "
"Length (%08X)\n", ConfigurationDescriptor,
Urb->UrbControlDescriptorRequest
.TransferBufferLength));
} else {
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
break;
}
// see if we got enough data, we may get an error in URB because of
// buffer overrun
if (Urb->UrbControlDescriptorRequest.TransferBufferLength>0 &&
ConfigurationDescriptor->wTotalLength > Size) {
// size of data exceeds current buffer size, so allocate correct
// size
Size = ConfigurationDescriptor->wTotalLength;
DEBUG_MEMFREE(ConfigurationDescriptor);
ConfigurationDescriptor = NULL;
} else {
break;
}
}
if (NT_SUCCESS(NtStatus)) {
NtStatus = SelectInterface(DeviceObject, ConfigurationDescriptor);
DEBUG_MEMFREE(ConfigurationDescriptor);
ConfigurationDescriptor = NULL;
}
else
{
DEBUG_MEMFREE(ConfigurationDescriptor);
ConfigurationDescriptor = NULL;
}
// found a config we like
if (NT_SUCCESS(NtStatus))
break;
}
DEBUG_MEMFREE(Urb);
} else {
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
}
DEBUG_LOG_PATH("exit ConfigureDevice");
return NtStatus;
} // ConfigureDevice
/************************************************************************/
/* SelectInterface */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Select interface for USB device. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* ConfigurationDescriptor - pointer to config descriptor */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
SelectInterface(IN PDEVICE_OBJECT DeviceObject,
IN PUSB_CONFIGURATION_DESCRIPTOR ConfigurationDescriptor)
{
PDEVICE_EXTENSION DeviceExtension
= DeviceObject->DeviceExtension;
NTSTATUS NtStatus;
PURB Urb;
USHORT Size;
ULONG Index;
PUSBD_INTERFACE_INFORMATION Interfaces[2];
PUSBD_INTERFACE_INFORMATION Interface;
PUSB_INTERFACE_DESCRIPTOR InterfaceDescriptor[2];
UCHAR AlternateSetting, InterfaceNumber;
ULONG Pipe;
KIRQL OldIrql;
PUCHAR Temp;
BOOLEAN FoundCommDevice = FALSE;
DEBUG_LOG_PATH("enter SelectInterface");
Urb = USBD_CreateConfigurationRequest(ConfigurationDescriptor, &Size);
if (Urb) {
Temp = (PUCHAR) &Urb->UrbSelectConfiguration.Interface;
for (InterfaceNumber = 0;
InterfaceNumber < ConfigurationDescriptor->bNumInterfaces;
InterfaceNumber++) {
AlternateSetting = 0;
InterfaceDescriptor[InterfaceNumber] =
USBD_ParseConfigurationDescriptor(ConfigurationDescriptor,
InterfaceNumber,
AlternateSetting);
Interfaces[InterfaceNumber] = (PUSBD_INTERFACE_INFORMATION) Temp;
Interfaces[InterfaceNumber]->Length
= GET_USBD_INTERFACE_SIZE(InterfaceDescriptor[InterfaceNumber]
->bNumEndpoints);
Interfaces[InterfaceNumber]->InterfaceNumber
= InterfaceDescriptor[InterfaceNumber]->bInterfaceNumber;
Interfaces[InterfaceNumber]->AlternateSetting
= InterfaceDescriptor[InterfaceNumber]->bAlternateSetting;
for (Index = 0; Index < Interfaces[InterfaceNumber]->NumberOfPipes;
Index++)
{
PUSBD_PIPE_INFORMATION PipeInformation;
PipeInformation = &Interfaces[InterfaceNumber]->Pipes[Index];
if (USB_ENDPOINT_DIRECTION_IN(PipeInformation->EndpointAddress))
{
// check for data in pipe
if (PipeInformation->PipeType == USB_ENDPOINT_TYPE_BULK)
{
// set bulk pipe in max transfer size
PipeInformation->MaximumTransferSize
= USB_RX_BUFF_SIZE;
}
}
else if (USB_ENDPOINT_DIRECTION_OUT(PipeInformation->EndpointAddress))
{
// check for data out pipe
if (PipeInformation->PipeType == USB_ENDPOINT_TYPE_BULK)
{
// set bulk pipe out max transfer size
PipeInformation->MaximumTransferSize
= MAXIMUM_TRANSFER_SIZE;
}
}
}
Temp += Interfaces[InterfaceNumber]->Length;
}
UsbBuildSelectConfigurationRequest(Urb, Size, ConfigurationDescriptor);
NtStatus = CallUSBD(DeviceObject, Urb);
if (NtStatus != STATUS_SUCCESS) {
ExFreePool(Urb);
goto ExitSelectInterface;
}
DEBUG_TRACE3(("Select Config Status (%08X)\n", NtStatus));
DeviceExtension->ConfigurationHandle
= Urb->UrbSelectConfiguration.ConfigurationHandle;
for (InterfaceNumber = 0;
InterfaceNumber < ConfigurationDescriptor->bNumInterfaces;
InterfaceNumber++) {
Interface = Interfaces[InterfaceNumber];
DEBUG_TRACE3(("---------\n"));
DEBUG_TRACE3(("NumberOfPipes (%08X)\n", Interface->NumberOfPipes));
DEBUG_TRACE3(("Length (%08X)\n", Interface->Length));
DEBUG_TRACE3(("Alt Setting (%08X)\n",
Interface->AlternateSetting));
DEBUG_TRACE3(("Interface Number (%08X)\n",
Interface->InterfaceNumber));
DEBUG_TRACE3(("Class (%08X) SubClass (%08X) Protocol (%08X)\n",
Interface->Class,
Interface->SubClass,
Interface->Protocol));
if (Interface->Class == USB_COMM_COMMUNICATION_CLASS_CODE) {
FoundCommDevice = TRUE;
DeviceExtension->CommInterface = Interface->InterfaceNumber;
}
for (Pipe = 0; Pipe < Interface->NumberOfPipes; Pipe++) {
PUSBD_PIPE_INFORMATION PipeInformation;
PipeInformation = &Interface->Pipes[Pipe];
DEBUG_TRACE3(("---------\n"));
DEBUG_TRACE3(("PipeType (%08X)\n",
PipeInformation->PipeType));
DEBUG_TRACE3(("EndpointAddress (%08X)\n",
PipeInformation->EndpointAddress));
DEBUG_TRACE3(("MaxPacketSize (%08X)\n",
PipeInformation->MaximumPacketSize));
DEBUG_TRACE3(("Interval (%08X)\n",
PipeInformation->Interval));
DEBUG_TRACE3(("Handle (%08X)\n",
PipeInformation->PipeHandle));
DEBUG_TRACE3(("MaximumTransferSize (%08X)\n",
PipeInformation->MaximumTransferSize));
// now lets save pipe handles in device extension
if (USB_ENDPOINT_DIRECTION_IN(PipeInformation->EndpointAddress)) {
// check for data in pipe
if (PipeInformation->PipeType == USB_ENDPOINT_TYPE_BULK) {
PVOID pOldNotBuff = NULL;
PVOID pOldReadBuff = NULL;
PVOID pOldUSBReadBuff = NULL;
PVOID pNewNotBuff = NULL;
PVOID pNewReadBuff = NULL;
PVOID pNewUSBReadBuff = NULL;
DeviceExtension->RxMaxPacketSize = RxBuffSize;
if (DeviceExtension->RxMaxPacketSize != 0) {
pNewReadBuff = DEBUG_MEMALLOC(NonPagedPool,
DeviceExtension->RxMaxPacketSize);
}
pNewNotBuff = DEBUG_MEMALLOC(NonPagedPool,
NOTIFICATION_BUFF_SIZE);
pNewUSBReadBuff = DEBUG_MEMALLOC(NonPagedPool,
USB_RX_BUFF_SIZE);
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
DeviceExtension->DataInPipe = PipeInformation->PipeHandle;
if (DeviceExtension->NotificationBuff)
pOldNotBuff = DeviceExtension->NotificationBuff;
if (DeviceExtension->ReadBuff)
pOldReadBuff = DeviceExtension->ReadBuff;
if (DeviceExtension->USBReadBuff)
pOldUSBReadBuff = DeviceExtension->USBReadBuff;
DeviceExtension->RxQueueSize
= DeviceExtension->RxMaxPacketSize;
DeviceExtension->CharsInReadBuff = 0;
DeviceExtension->CurrentReadBuffPtr = 0;
DeviceExtension->ReadBuff = pNewReadBuff;
DeviceExtension->USBReadBuff = pNewUSBReadBuff;
DeviceExtension->NotificationBuff = pNewNotBuff;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
if (pOldNotBuff != NULL) {
DEBUG_MEMFREE(pOldNotBuff);
}
if (pOldReadBuff != NULL) {
DEBUG_MEMFREE(pOldReadBuff);
}
if (pOldUSBReadBuff != NULL) {
DEBUG_MEMFREE(pOldUSBReadBuff);
}
}
// check for notification pipe
else if (PipeInformation->PipeType
== USB_ENDPOINT_TYPE_INTERRUPT)
DeviceExtension->NotificationPipe
= PipeInformation->PipeHandle;
} else {
// check for data out pipe
if (PipeInformation->PipeType == USB_ENDPOINT_TYPE_BULK)
DeviceExtension->DataOutPipe = PipeInformation->PipeHandle;
}
}
DEBUG_TRACE3(("Data Out (%08X) Data In (%08X) Notification (%08X)\n",
DeviceExtension->DataOutPipe,
DeviceExtension->DataInPipe,
DeviceExtension->NotificationPipe));
}
ExFreePool(Urb);
} else {
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
}
if (!FoundCommDevice)
NtStatus = STATUS_NO_SUCH_DEVICE;
ExitSelectInterface:;
DEBUG_LOG_PATH("exit SelectInterface");
return NtStatus;
} // SelectInterface
/************************************************************************/
/* BuildRequest */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Build a Urb for a USB request */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* Irp - pointer to Irp */
/* PipeHandle - USB pipe handle */
/* Read - transfer direction */
/* */
/* Return Value: */
/* */
/* Pointer to URB */
/* */
/************************************************************************/
PURB
BuildRequest(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp,
IN USBD_PIPE_HANDLE PipeHandle, IN BOOLEAN Read)
{
ULONG Size;
ULONG Length;
PURB Urb;
PAGED_CODE();
DEBUG_LOG_PATH("enter BuildRequest");
// length of buffer
Length = MmGetMdlByteCount(Irp->MdlAddress);
// allocate and zero Urb
Size = sizeof(struct _URB_BULK_OR_INTERRUPT_TRANSFER);
Urb = DEBUG_MEMALLOC(NonPagedPool, Size);
if (Urb) {
RtlZeroMemory(Urb, Size);
Urb->UrbBulkOrInterruptTransfer.Hdr.Length = (USHORT) Size;
Urb->UrbBulkOrInterruptTransfer.Hdr.Function =
URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER;
Urb->UrbBulkOrInterruptTransfer.PipeHandle = PipeHandle;
Urb->UrbBulkOrInterruptTransfer.TransferFlags =
Read ? USBD_TRANSFER_DIRECTION_IN : 0;
// use an MDL
Urb->UrbBulkOrInterruptTransfer.TransferBufferMDL = Irp->MdlAddress;
Urb->UrbBulkOrInterruptTransfer.TransferBufferLength = Length;
// short packet is not treated as an error.
Urb->UrbBulkOrInterruptTransfer.TransferFlags |= USBD_SHORT_TRANSFER_OK;
// no linkage for now
Urb->UrbBulkOrInterruptTransfer.UrbLink = NULL;
}
DEBUG_LOG_PATH("exit BuildRequest");
return Urb;
} // BuildRequest
/************************************************************************/
/* BuildReadRequest */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Build a Urb for a USB read request */
/* */
/* Arguments: */
/* */
/* Urb - pointer to URB */
/* Buffer - pointer to data buffer */
/* Length - length of data buffer */
/* PipeHandle - USB pipe handle */
/* Read - transfer direction */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
BuildReadRequest(PURB Urb, PUCHAR Buffer, ULONG Length,
IN USBD_PIPE_HANDLE PipeHandle, IN BOOLEAN Read)
{
ULONG Size;
// PAGED_CODE();
DEBUG_LOG_PATH("enter BuildReadRequest");
Size = sizeof(struct _URB_BULK_OR_INTERRUPT_TRANSFER);
// zero Urb
RtlZeroMemory(Urb, Size);
Urb->UrbBulkOrInterruptTransfer.Hdr.Length = (USHORT) Size;
Urb->UrbBulkOrInterruptTransfer.Hdr.Function =
URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER;
Urb->UrbBulkOrInterruptTransfer.PipeHandle = PipeHandle;
Urb->UrbBulkOrInterruptTransfer.TransferFlags =
Read ? USBD_TRANSFER_DIRECTION_IN : 0;
// we are using a tranfsfer buffer instead of an MDL
Urb->UrbBulkOrInterruptTransfer.TransferBuffer = Buffer;
Urb->UrbBulkOrInterruptTransfer.TransferBufferLength = Length;
Urb->UrbBulkOrInterruptTransfer.TransferBufferMDL = NULL;
// short packet is not treated as an error.
Urb->UrbBulkOrInterruptTransfer.TransferFlags |= USBD_SHORT_TRANSFER_OK;
// no linkage for now
Urb->UrbBulkOrInterruptTransfer.UrbLink = NULL;
DEBUG_LOG_PATH("exit BuildReadRequest");
} // BuildReadRequest
/************************************************************************/
/* ClassVendorCommand */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Issue class or vendor specific command */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* Request - request field of class/vendor specific command */
/* Value - value field of class/vendor specific command */
/* Index - index field of class/vendor specific command */
/* Buffer - pointer to data buffer */
/* BufferLen - data buffer length */
/* Read - data direction flag */
/* Class - True if Class Command, else vendor command */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
ClassVendorCommand(IN PDEVICE_OBJECT DeviceObject, IN UCHAR Request,
IN USHORT Value, IN USHORT Index, IN PVOID Buffer,
IN OUT PULONG BufferLen, IN BOOLEAN Read, IN ULONG ComType)
{
NTSTATUS NtStatus;
PURB Urb;
ULONG Size;
ULONG Length;
PAGED_CODE();
DEBUG_LOG_PATH("enter VendorCommand");
// length of buffer passed in
Length = BufferLen ? *BufferLen : 0;
Size = sizeof(struct _URB_CONTROL_VENDOR_OR_CLASS_REQUEST);
// allocate memory for the Urb
Urb = DEBUG_MEMALLOC(NonPagedPool, Size);
if (Urb) {
UsbBuildVendorRequest(Urb, ComType == USBSER_CLASS_COMMAND
? URB_FUNCTION_CLASS_INTERFACE
: URB_FUNCTION_VENDOR_DEVICE, (USHORT) Size,
Read ? USBD_TRANSFER_DIRECTION_IN
: USBD_TRANSFER_DIRECTION_OUT, 0, Request, Value,
Index, Buffer, NULL, Length, NULL);
NtStatus = CallUSBD(DeviceObject, Urb);
// get length of buffer
if (BufferLen)
*BufferLen = Urb->UrbControlVendorClassRequest.TransferBufferLength;
DEBUG_MEMFREE(Urb);
} else {
NtStatus = STATUS_INSUFFICIENT_RESOURCES;
}
DEBUG_LOG_PATH("exit VendorCommand");
return NtStatus;
} // ClassVendorCommand
/************************************************************************/
/* CancelPendingWaitMasks */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Cancels any wait masks in progress. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to a device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
CancelPendingWaitMasks(IN PDEVICE_EXTENSION DeviceExtension)
{
KIRQL OldIrql;
PIRP CurrentMaskIrp;
DEBUG_LOG_PATH("enter CancelPendingWaitMasks");
UsbSerSerialDump(USBSERTRACEOTH, (">CancelPendingWaitMasks\n"));
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
CurrentMaskIrp = DeviceExtension->CurrentMaskIrp;
// mark current pending wait mask as cancelled
if(CurrentMaskIrp)
{
DeviceExtension->CurrentMaskIrp = NULL;
CurrentMaskIrp->IoStatus.Status = STATUS_CANCELLED;
CurrentMaskIrp->IoStatus.Information = 0;
IoSetCancelRoutine(CurrentMaskIrp, NULL);
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
IoCompleteRequest(CurrentMaskIrp, IO_NO_INCREMENT);
DEBUG_TRACE1(("CancelPendingWaitMask\n"));
} else {
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
}
DEBUG_LOG_PATH("exit CancelPendingWaitMasks");
UsbSerSerialDump(USBSERTRACEOTH, ("<CancelPendingWaitMasks\n"));
} // CancelPendingWaitMasks
/************************************************************************/
/* StartRead */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Kick off a read. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to a device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
StartRead(IN PDEVICE_EXTENSION DeviceExtension)
{
PIRP ReadIrp;
PURB ReadUrb;
CCHAR StackSize;
ULONG Size;
PAGED_CODE();
DEBUG_LOG_PATH("enter StartRead");
UsbSerSerialDump(USBSERTRACERD, (">StartRead\n"));
// get stack size for Irp and allocate one that we will use to keep
// read requests going
StackSize = (CCHAR)(DeviceExtension->StackDeviceObject->StackSize + 1);
ReadIrp = IoAllocateIrp(StackSize, FALSE);
if (ReadIrp) {
// get size of Urb and allocate
Size = sizeof(struct _URB_BULK_OR_INTERRUPT_TRANSFER);
ReadUrb = DEBUG_MEMALLOC(NonPagedPool, Size);
if (ReadUrb) {
KeInitializeEvent(&DeviceExtension->ReadEvent, NotificationEvent,
FALSE);
// save these to be freed when not needed
UsbSerFetchPVoidLocked(&DeviceExtension->ReadIrp, ReadIrp,
&DeviceExtension->ControlLock);
UsbSerFetchPVoidLocked(&DeviceExtension->ReadUrb, ReadUrb,
&DeviceExtension->ControlLock);
RestartRead(DeviceExtension);
}
}
UsbSerSerialDump(USBSERTRACERD, ("<StartRead\n"));
DEBUG_LOG_PATH("exit StartRead");
} // StartRead
/************************************************************************/
/* RestartRead */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Restart read request. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to a device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
RestartRead(IN PDEVICE_EXTENSION DeviceExtension)
{
PIRP ReadIrp;
PURB ReadUrb;
PIO_STACK_LOCATION NextStack;
BOOLEAN StartAnotherRead;
KIRQL OldIrql;
NTSTATUS NtStatus;
DEBUG_LOG_PATH("enter RestartRead");
UsbSerSerialDump(USBSERTRACERD, (">RestartRead\n"));
do
{
StartAnotherRead = FALSE;
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
if(!DeviceExtension->ReadInProgress && DeviceExtension->CharsInReadBuff <= LOW_WATER_MARK
&& DeviceExtension->AcceptingRequests)
{
StartAnotherRead = TRUE;
DeviceExtension->ReadInProgress = TRUE;
DeviceExtension->ReadInterlock = START_READ;
}
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
if(StartAnotherRead)
{
ReadIrp = DeviceExtension->ReadIrp;
ReadUrb = DeviceExtension->ReadUrb;
BuildReadRequest(ReadUrb, DeviceExtension->USBReadBuff,
USB_RX_BUFF_SIZE,
DeviceExtension->DataInPipe, TRUE);
// set Irp up for a submit Urb IOCTL
NextStack = IoGetNextIrpStackLocation(ReadIrp);
NextStack->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
NextStack->Parameters.Others.Argument1 = ReadUrb;
NextStack->Parameters.DeviceIoControl.IoControlCode
= IOCTL_INTERNAL_USB_SUBMIT_URB;
// completion routine will take care of updating buffers and counters
IoSetCompletionRoutine(ReadIrp,ReadCompletion, DeviceExtension, TRUE,
TRUE, TRUE);
DEBUG_TRACE1(("StartRead\n"));
InterlockedIncrement(&DeviceExtension->PendingDataInCount);
UsbSerSerialDump(USBSERTRACERD, ("DataInCounty %08X @ %08X\n",
DeviceExtension->PendingDataInCount,
&DeviceExtension->PendingDataInCount));
NtStatus = IoCallDriver(DeviceExtension->StackDeviceObject, ReadIrp);
DEBUG_TRACE1(("Read Status (%08X)\n", NtStatus));
if(!NT_SUCCESS(NtStatus))
{
if(InterlockedDecrement(&DeviceExtension->PendingDataInCount) == 0)
{
KeSetEvent(&DeviceExtension->PendingDataInEvent, IO_NO_INCREMENT,
FALSE);
UsbSerSerialDump(USBSERTRACERD, ("DataInCountz %08X @ %08X\n",
DeviceExtension->PendingDataInCount,
&DeviceExtension->PendingDataInCount));
}
}
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
if(DeviceExtension->ReadInterlock == IMMEDIATE_READ)
{
StartAnotherRead = TRUE;
}
else
{
StartAnotherRead = FALSE;
}
DeviceExtension->ReadInterlock = END_READ;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
}
}while(StartAnotherRead)
DEBUG_LOG_PATH("exit RestartRead");
UsbSerSerialDump(USBSERTRACERD, ("<RestartRead\n"));
} // RestartRead
/************************************************************************/
/* StartNotifyRead */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Kick off a notify read. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to a device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
StartNotifyRead(IN PDEVICE_EXTENSION DeviceExtension)
{
PIRP NotifyIrp;
PURB NotifyUrb;
CCHAR StackSize;
ULONG Size;
PAGED_CODE();
DEBUG_LOG_PATH("enter StartNotifyRead");
UsbSerSerialDump(USBSERTRACERD, (">StartNotifyRead\n"));
// get stack size for Irp and allocate one that we will use to keep
// notification requests going
StackSize = (CCHAR)(DeviceExtension->StackDeviceObject->StackSize + 1);
NotifyIrp = IoAllocateIrp(StackSize, FALSE);
if (NotifyIrp) {
// get size of Urb and allocate
Size = sizeof(struct _URB_BULK_OR_INTERRUPT_TRANSFER);
NotifyUrb = DEBUG_MEMALLOC(NonPagedPool, Size);
if (NotifyUrb) {
// save these to be freed when not needed
UsbSerFetchPVoidLocked(&DeviceExtension->NotifyIrp, NotifyIrp,
&DeviceExtension->ControlLock);
UsbSerFetchPVoidLocked(&DeviceExtension->NotifyUrb, NotifyUrb,
&DeviceExtension->ControlLock);
RestartNotifyRead(DeviceExtension);
}
}
DEBUG_LOG_PATH("exit StartNotifyRead");
UsbSerSerialDump(USBSERTRACERD, ("<StartNotifyRead\n"));
} // StartNotifyRead
/************************************************************************/
/* RestartNotifyRead */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Kick off a notify read. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to a device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
RestartNotifyRead(IN PDEVICE_EXTENSION DeviceExtension)
{
PIRP NotifyIrp;
PURB NotifyUrb;
PIO_STACK_LOCATION NextStack;
NTSTATUS NtStatus;
DEBUG_LOG_PATH("enter RestartNotifyRead");
UsbSerSerialDump(USBSERTRACERD, (">RestartNotifyRead\n"));
NotifyUrb = DeviceExtension->NotifyUrb;
NotifyIrp = DeviceExtension->NotifyIrp;
if(DeviceExtension->AcceptingRequests)
{
BuildReadRequest(NotifyUrb, DeviceExtension->NotificationBuff,
NOTIFICATION_BUFF_SIZE,
DeviceExtension->NotificationPipe, TRUE);
// set Irp up for a submit Urb IOCTL
NextStack = IoGetNextIrpStackLocation(NotifyIrp);
NextStack->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
NextStack->Parameters.Others.Argument1 = NotifyUrb;
NextStack->Parameters.DeviceIoControl.IoControlCode
= IOCTL_INTERNAL_USB_SUBMIT_URB;
// completion routine will take care of updating buffers and counters
IoSetCompletionRoutine(NotifyIrp, NotifyCompletion, DeviceExtension,
TRUE, TRUE, TRUE);
DEBUG_TRACE1(("Start NotifyRead\n"));
InterlockedIncrement(&DeviceExtension->PendingNotifyCount);
NtStatus = IoCallDriver(DeviceExtension->StackDeviceObject, NotifyIrp);
if (!NT_SUCCESS(NtStatus))
{
if (InterlockedDecrement(&DeviceExtension->PendingNotifyCount) == 0)
{
KeSetEvent(&DeviceExtension->PendingNotifyEvent, IO_NO_INCREMENT, FALSE);
}
}
DEBUG_TRACE1(("Status (%08X)\n", NtStatus));
}
DEBUG_LOG_PATH("exit RestartNotifyRead");
UsbSerSerialDump(USBSERTRACERD, ("<RestartNotifyRead\n"));
} // RestartNotifyRead
/************************************************************************/
/* ReadCompletion */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Read completion routine. */
/* */
/* Arguments: */
/* */
/* DeviceObject - pointer to a device object */
/* Irp - pointer to Irp */
/* Context - pointer to driver defined context */
/* */
/* Return Value: */
/* */
/* NTSTATUS */
/* */
/************************************************************************/
NTSTATUS
ReadCompletion(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp, IN PVOID Context)
{
PDEVICE_EXTENSION DeviceExtension = (PDEVICE_EXTENSION) Context;
PURB Urb;
ULONG Count;
KIRQL OldIrql;
DEBUG_LOG_PATH("enter ReadCompletion");
UsbSerSerialDump(USBSERTRACERD, (">ReadCompletion(%08X)\n", Irp));
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
Urb = DeviceExtension->ReadUrb;
Count = Urb->UrbBulkOrInterruptTransfer.TransferBufferLength;
if (NT_SUCCESS(Irp->IoStatus.Status)
&& (DeviceExtension->CurrentDevicePowerState == PowerDeviceD0))
{
DeviceExtension->HistoryMask |= SERIAL_EV_RXCHAR | SERIAL_EV_RX80FULL;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
//
// Scan for RXFLAG char if needed
//
if(DeviceExtension->IsrWaitMask & SERIAL_EV_RXFLAG)
{
ULONG i;
for(i = 0; i < Count; i++)
{
if(*((PUCHAR)(DeviceExtension->USBReadBuff + i))
== DeviceExtension->SpecialChars.EventChar)
{
DeviceExtension->HistoryMask |= SERIAL_EV_RXFLAG;
break;
}
}
}
PutData(DeviceExtension, Count);
// got some data, let's see if we can satisfy any queued reads
CheckForQueuedReads(DeviceExtension);
DEBUG_TRACE1(("ReadCompletion (%08X)\n", DeviceExtension->CharsInReadBuff));
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
DeviceExtension->ReadInProgress = FALSE;
if(DeviceExtension->ReadInterlock == END_READ)
{
DeviceExtension->ReadInterlock = IMMEDIATE_READ;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
RestartRead(DeviceExtension);
}
else
{
DeviceExtension->ReadInterlock = IMMEDIATE_READ;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
}
}
else
{
//
// the device is not accepting requests, so signal anyone who
// cancelled this or is waiting for it to stop
//
DeviceExtension->ReadInterlock = IMMEDIATE_READ;
DeviceExtension->ReadInProgress = FALSE;
DeviceExtension->AcceptingRequests = FALSE;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
KeSetEvent(&DeviceExtension->ReadEvent, 1, FALSE);
DEBUG_TRACE1(("RC Irp Status (%08X)\n", Irp->IoStatus.Status));
}
//
// Notify everyone if this is the last IRP
//
if (InterlockedDecrement(&DeviceExtension->PendingDataInCount) == 0)
{
UsbSerSerialDump(USBSERTRACEOTH, ("DataIn pipe is empty\n"));
KeSetEvent(&DeviceExtension->PendingDataInEvent, IO_NO_INCREMENT, FALSE);
}
UsbSerSerialDump(USBSERTRACERD, ("DataInCount %08X @ %08X\n",
DeviceExtension->PendingDataInCount,
&DeviceExtension->PendingDataInCount));
DEBUG_LOG_PATH("exit ReadCompletion");
UsbSerSerialDump(USBSERTRACERD, ("<ReadCompletion\n"));
return STATUS_MORE_PROCESSING_REQUIRED;
} // ReadCompletion
/************************************************************************/
/* GetData */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Get data from circular buffer. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to device extension */
/* Buffer - pointer to buffer */
/* BufferLen - size of buffer */
/* */
/* Return Value: */
/* */
/* ULONG */
/* */
/************************************************************************/
ULONG
GetData(IN PDEVICE_EXTENSION DeviceExtension, IN PCHAR Buffer,
IN ULONG BufferLen, IN OUT PULONG_PTR NewCount)
{
ULONG count;
KIRQL OldIrql;
DEBUG_LOG_PATH("enter GetData");
UsbSerSerialDump(USBSERTRACERD, (">GetData\n"));
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
BufferLen = min(DeviceExtension->CharsInReadBuff, BufferLen);
if(BufferLen)
{
count = min(BufferLen, (DeviceExtension->RxMaxPacketSize - DeviceExtension->CurrentReadBuffPtr));
memcpy(Buffer,
&DeviceExtension->ReadBuff[DeviceExtension->CurrentReadBuffPtr],
count);
Buffer += count;
DeviceExtension->CurrentReadBuffPtr += count;
DeviceExtension->CharsInReadBuff -= count;
DeviceExtension->NumberNeededForRead -= count;
BufferLen -= count;
*NewCount += count;
// if there is still something left in the buffer, then we wrapped
if(BufferLen)
{
memcpy(Buffer, DeviceExtension->ReadBuff, BufferLen);
DeviceExtension->CurrentReadBuffPtr = BufferLen;
DeviceExtension->CharsInReadBuff -= BufferLen;
DeviceExtension->NumberNeededForRead -= BufferLen;
*NewCount += BufferLen;
}
}
DEBUG_TRACE2(("Count (%08X) CharsInReadBuff (%08X)\n", count, DeviceExtension->CharsInReadBuff));
#if DBG
if (UsbSerSerialDebugLevel & USBSERDUMPRD) {
ULONG i;
DbgPrint("RD: ");
for (i = 0; i < count; i++) {
DbgPrint("%02x ", Buffer[i] & 0xFF);
}
DbgPrint("\n\n");
}
#endif
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
RestartRead(DeviceExtension);
DEBUG_LOG_PATH("exit GetData");
UsbSerSerialDump(USBSERTRACERD, ("<GetData\n"));
return count;
} // GetData
/************************************************************************/
/* PutData */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Put data in circular buffer. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to device extension */
/* BufferLen - size of buffer */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
PutData(IN PDEVICE_EXTENSION DeviceExtension, IN ULONG BufferLen)
{
KIRQL OldIrql;
ULONG count;
ULONG BuffPtr;
if(BufferLen)
{
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
// get current pointer into circular buffer
BuffPtr = (DeviceExtension->CharsInReadBuff + DeviceExtension->CurrentReadBuffPtr) %
DeviceExtension->RxMaxPacketSize;
// figure out amount to copy into read buffer, in case we would right past end of buffer
count = min(BufferLen, (DeviceExtension->RxMaxPacketSize - BuffPtr));
memcpy(&DeviceExtension->ReadBuff[BuffPtr],
DeviceExtension->USBReadBuff, count);
// update counters
BufferLen -= count;
DeviceExtension->CharsInReadBuff += count;
DeviceExtension->ReadByIsr += count;
// if there is still something left in the buffer, then we wrapped
if(BufferLen)
{
// count still holds the amount copied from buffer on first copy
// and BufferLen holds the amount remaining to copy
memcpy(DeviceExtension->ReadBuff,
&DeviceExtension->USBReadBuff[count], BufferLen);
DeviceExtension->CharsInReadBuff += BufferLen;
DeviceExtension->ReadByIsr += BufferLen;
}
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
}
} // PutData
VOID
UsbSerRundownIrpRefs(IN PIRP *PpCurrentOpIrp, IN PKTIMER IntervalTimer OPTIONAL,
IN PKTIMER TotalTimer OPTIONAL,
IN PDEVICE_EXTENSION PDevExt)
/*++
Routine Description:
This routine runs through the various items that *could*
have a reference to the current read/write. It try's to kill
the reason. If it does succeed in killing the reason it
will decrement the reference count on the irp.
NOTE: This routine assumes that it is called with the cancel
spin lock held.
Arguments:
PpCurrentOpIrp - Pointer to a pointer to current irp for the
particular operation.
IntervalTimer - Pointer to the interval timer for the operation.
NOTE: This could be null.
TotalTimer - Pointer to the total timer for the operation.
NOTE: This could be null.
PDevExt - Pointer to device extension
Return Value:
None.
--*/
{
// PAGED_CODE();
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerRundownIrpRefs(%08X)\n",
*PpCurrentOpIrp));
//
// This routine is called with the cancel spin lock held
// so we know only one thread of execution can be in here
// at one time.
//
//
// First we see if there is still a cancel routine. If
// so then we can decrement the count by one.
//
if ((*PpCurrentOpIrp)->CancelRoutine) {
USBSER_CLEAR_REFERENCE(*PpCurrentOpIrp, USBSER_REF_CANCEL);
IoSetCancelRoutine(*PpCurrentOpIrp, NULL);
}
if (IntervalTimer) {
//
// Try to cancel the operations interval timer. If the operation
// returns true then the timer did have a reference to the
// irp. Since we've canceled this timer that reference is
// no longer valid and we can decrement the reference count.
//
// If the cancel returns false then this means either of two things:
//
// a) The timer has already fired.
//
// b) There never was an interval timer.
//
// In the case of "b" there is no need to decrement the reference
// count since the "timer" never had a reference to it.
//
// In the case of "a", then the timer itself will be coming
// along and decrement it's reference. Note that the caller
// of this routine might actually be the this timer, but it
// has already decremented the reference.
//
if (KeCancelTimer(IntervalTimer)) {
USBSER_CLEAR_REFERENCE(*PpCurrentOpIrp, USBSER_REF_INT_TIMER);
}
}
if (TotalTimer) {
//
// Try to cancel the operations total timer. If the operation
// returns true then the timer did have a reference to the
// irp. Since we've canceled this timer that reference is
// no longer valid and we can decrement the reference count.
//
// If the cancel returns false then this means either of two things:
//
// a) The timer has already fired.
//
// b) There never was an total timer.
//
// In the case of "b" there is no need to decrement the reference
// count since the "timer" never had a reference to it.
// //
// If we have an escape char event pending, we can't overstuff,
// so subtract one from the length
//
// In the case of "a", then the timer itself will be coming
// along and decrement it's reference. Note that the caller
// of this routine might actually be the this timer, but it
// has already decremented the reference.
//
if (KeCancelTimer(TotalTimer)) {
USBSER_CLEAR_REFERENCE(*PpCurrentOpIrp, USBSER_REF_TOTAL_TIMER);
}
}
// USBSER_CLEAR_REFERENCE(*PpCurrentOpIrp, USBSER_REF_RXBUFFER);
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerRundownIrpRefs\n"));
}
VOID
UsbSerTryToCompleteCurrent(IN PDEVICE_EXTENSION PDevExt,
IN KIRQL IrqlForRelease, IN NTSTATUS StatusToUse,
IN PIRP *PpCurrentOpIrp,
IN PLIST_ENTRY PQueue OPTIONAL,
IN PKTIMER PIntervalTimer OPTIONAL,
IN PKTIMER PTotalTimer OPTIONAL,
IN PUSBSER_START_ROUTINE Starter OPTIONAL,
IN PUSBSER_GET_NEXT_ROUTINE PGetNextIrp OPTIONAL,
IN LONG RefType,
IN BOOLEAN Complete)
/*++
Routine Description:
This routine attempts to kill all of the reasons there are
references on the current read/write. If everything can be killed
it will complete this read/write and try to start another.
NOTE: This routine assumes that it is called with the cancel
spinlock held.
Arguments:
Extension - Simply a pointer to the device extension.
SynchRoutine - A routine that will synchronize with the isr
and attempt to remove the knowledge of the
current irp from the isr. NOTE: This pointer
can be null.
IrqlForRelease - This routine is called with the cancel spinlock held.
This is the irql that was current when the cancel
spinlock was acquired.
StatusToUse - The irp's status field will be set to this value, if
this routine can complete the irp.
Return Value:
None.
--*/
{
USBSER_ALWAYS_LOCKED_CODE();
UsbSerSerialDump(USBSERTRACEOTH | USBSERTRACERD | USBSERTRACEWR,
(">UsbSerTryToCompleteCurrent(%08X)\n", *PpCurrentOpIrp));
//
// We can decrement the reference to "remove" the fact
// that the caller no longer will be accessing this irp.
//
USBSER_CLEAR_REFERENCE(*PpCurrentOpIrp, RefType);
//
// Try to run down all other references to this irp.
//
UsbSerRundownIrpRefs(PpCurrentOpIrp, PIntervalTimer, PTotalTimer, PDevExt);
//
// See if the ref count is zero after trying to kill everybody else.
//
if (!USBSER_REFERENCE_COUNT(*PpCurrentOpIrp)) {
PIRP pNewIrp;
//
// The ref count was zero so we should complete this
// request.
//
// The following call will also cause the current irp to be
// completed.
//
(*PpCurrentOpIrp)->IoStatus.Status = StatusToUse;
if (StatusToUse == STATUS_CANCELLED) {
(*PpCurrentOpIrp)->IoStatus.Information = 0;
}
if (PGetNextIrp) {
RELEASE_CANCEL_SPINLOCK(PDevExt, IrqlForRelease);
(*PGetNextIrp)(PpCurrentOpIrp, PQueue, &pNewIrp, Complete, PDevExt);
if (pNewIrp) {
Starter(PDevExt);
}
} else {
PIRP pOldIrp = *PpCurrentOpIrp;
//
// There was no get next routine. We will simply complete
// the irp. We should make sure that we null out the
// pointer to the pointer to this irp.
//
*PpCurrentOpIrp = NULL;
RELEASE_CANCEL_SPINLOCK(PDevExt, IrqlForRelease);
if (Complete) {
IoCompleteRequest(pOldIrp, IO_SERIAL_INCREMENT);
}
}
} else {
RELEASE_CANCEL_SPINLOCK(PDevExt, IrqlForRelease);
UsbSerSerialDump(USBSERTRACEOTH | USBSERTRACERD | USBSERTRACEWR,
("Current IRP still has reference of %08X\n",
((UINT_PTR)((IoGetCurrentIrpStackLocation((*PpCurrentOpIrp))->
Parameters.Others.Argument4)))));
}
UsbSerSerialDump(USBSERTRACEOTH | USBSERTRACERD | USBSERTRACEWR,
("<UsbSerTryToCompleteCurrent\n"));
}
/************************************************************************/
/* CheckForQueuedReads */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* See if we have any queued reads that we can satisfy. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
CheckForQueuedReads(IN PDEVICE_EXTENSION DeviceExtension)
{
ULONG charsRead = 0;
PULONG pWaitMask;
KIRQL oldIrql;
//
// May be paged if we do counter
//
DEBUG_LOG_PATH("enter CheckForQueuedReads");
UsbSerSerialDump(USBSERTRACERD, (">CheckForQueuedReads\n"));
ACQUIRE_CANCEL_SPINLOCK(DeviceExtension, &oldIrql);
if ((DeviceExtension->CurrentReadIrp != NULL)
&& (USBSER_REFERENCE_COUNT(DeviceExtension->CurrentReadIrp)
& USBSER_REF_RXBUFFER))
{
RELEASE_CANCEL_SPINLOCK(DeviceExtension, oldIrql);
DEBUG_TRACE3(("Reading 0x%x\n", DeviceExtension->NumberNeededForRead));
charsRead
= GetData(DeviceExtension,
((PUCHAR)(DeviceExtension->CurrentReadIrp
->AssociatedIrp.SystemBuffer))
+ (IoGetCurrentIrpStackLocation(DeviceExtension
->CurrentReadIrp))
->Parameters.Read.Length
- DeviceExtension->NumberNeededForRead,
DeviceExtension->NumberNeededForRead,
&DeviceExtension->CurrentReadIrp->IoStatus.Information);
ACQUIRE_CANCEL_SPINLOCK(DeviceExtension, &oldIrql);
//
// See if this read is complete
//
if (DeviceExtension->NumberNeededForRead == 0) {
DEBUG_TRACE3(("USBSER: Completing read\n"));
if(DeviceExtension->CurrentReadIrp)
{
DeviceExtension->CurrentReadIrp->IoStatus.Status = STATUS_SUCCESS;
}
//
// Mark the read as completed and try to service the next one
//
DeviceExtension->CountOnLastRead = SERIAL_COMPLETE_READ_COMPLETE;
#if DBG
if (UsbSerSerialDebugLevel & USBSERDUMPRD) {
ULONG i;
ULONG count;
if (DeviceExtension->CurrentReadIrp->IoStatus.Status == STATUS_SUCCESS) {
count = (ULONG)DeviceExtension->CurrentReadIrp->IoStatus.Information;
} else {
count = 0;
}
DbgPrint("RD2: A(%08X) G(%08X) I(%08X)\n",
IoGetCurrentIrpStackLocation(DeviceExtension->CurrentReadIrp)
->Parameters.Read.Length, count, DeviceExtension->CurrentReadIrp);
for (i = 0; i < count; i++) {
DbgPrint("%02x ", *(((PUCHAR)DeviceExtension->CurrentReadIrp
->AssociatedIrp.SystemBuffer) + i) & 0xFF);
}
if (i == 0) {
DbgPrint("NULL (%08X)\n", DeviceExtension->CurrentReadIrp
->IoStatus.Status);
}
DbgPrint("\n\n");
}
#endif
UsbSerTryToCompleteCurrent(DeviceExtension, oldIrql, STATUS_SUCCESS,
&DeviceExtension->CurrentReadIrp,
&DeviceExtension->ReadQueue,
&DeviceExtension->ReadRequestIntervalTimer,
&DeviceExtension->ReadRequestTotalTimer,
UsbSerStartRead, UsbSerGetNextIrp,
USBSER_REF_RXBUFFER,
TRUE);
ACQUIRE_CANCEL_SPINLOCK(DeviceExtension, &oldIrql);
}
}
if (DeviceExtension->IsrWaitMask & SERIAL_EV_RXCHAR) {
DeviceExtension->HistoryMask |= SERIAL_EV_RXCHAR;
}
if (DeviceExtension->CurrentMaskIrp != NULL) {
pWaitMask = (PULONG)DeviceExtension->CurrentMaskIrp->
AssociatedIrp.SystemBuffer;
//
// Process events
//
if (DeviceExtension->IsrWaitMask & DeviceExtension->HistoryMask) {
PIRP pMaskIrp;
DEBUG_TRACE3(("Completing events\n"));
*pWaitMask = DeviceExtension->HistoryMask;
DeviceExtension->HistoryMask = 0;
pMaskIrp = DeviceExtension->CurrentMaskIrp;
pMaskIrp->IoStatus.Information = sizeof(ULONG);
pMaskIrp->IoStatus.Status = STATUS_SUCCESS;
DeviceExtension->CurrentMaskIrp = NULL;
IoSetCancelRoutine(pMaskIrp, NULL);
RELEASE_CANCEL_SPINLOCK(DeviceExtension, oldIrql);
IoCompleteRequest(pMaskIrp, IO_SERIAL_INCREMENT);
}
else
{
RELEASE_CANCEL_SPINLOCK(DeviceExtension, oldIrql);
}
}
else
{
RELEASE_CANCEL_SPINLOCK(DeviceExtension, oldIrql);
}
DEBUG_LOG_PATH("exit CheckForQueuedReads");
UsbSerSerialDump(USBSERTRACERD, ("<CheckForQueuedReads\n"));
} // CheckForQueuedReads
VOID
UsbSerGetNextIrp(IN PIRP *PpCurrentOpIrp, IN PLIST_ENTRY PQueueToProcess,
OUT PIRP *PpNextIrp, IN BOOLEAN CompleteCurrent,
IN PDEVICE_EXTENSION PDevExt)
/*++
Routine Description:
This function gets the next IRP off a queue, marks it as current,
and possibly completes the current IRP.
Arguments:
PpCurrentOpIrp - A pointer to the pointer to the current IRP.
PQueueToProcess - A pointer to the queue to get the next IRP from.
PpNextIrp - A pointer to the pointer to the next IRP to process.
CompleteCurrent - TRUE if we should complete the IRP that is current at
the time we are called.
PDevExt - A pointer to the device extension.
Return Value:
NTSTATUS
--*/
{
KIRQL oldIrql;
PIRP pOldIrp;
USBSER_ALWAYS_LOCKED_CODE();
DEBUG_LOG_PATH("Enter UsbSerGetNextIrp");
UsbSerSerialDump(USBSERTRACEOTH | USBSERTRACERD | USBSERTRACEWR,
(">UsbSerGetNextIrp(%08)\n", *PpCurrentOpIrp));
ACQUIRE_CANCEL_SPINLOCK(PDevExt, &oldIrql);
pOldIrp = *PpCurrentOpIrp;
#if DBG
if (pOldIrp != NULL) {
if (CompleteCurrent) {
ASSERT(pOldIrp->CancelRoutine == NULL);
}
}
#endif
//
// Check to see if there is a new irp to start up
//
if (!IsListEmpty(PQueueToProcess)) {
PLIST_ENTRY pHeadOfList;
pHeadOfList = RemoveHeadList(PQueueToProcess);
*PpCurrentOpIrp = CONTAINING_RECORD(pHeadOfList, IRP,
Tail.Overlay.ListEntry);
IoSetCancelRoutine(*PpCurrentOpIrp, NULL);
} else {
*PpCurrentOpIrp = NULL;
}
*PpNextIrp = *PpCurrentOpIrp;
RELEASE_CANCEL_SPINLOCK(PDevExt, oldIrql);
//
// Complete the current one if so requested
//
if (CompleteCurrent) {
if (pOldIrp != NULL) {
IoCompleteRequest(pOldIrp, IO_SERIAL_INCREMENT);
}
}
DEBUG_LOG_PATH("Exit UsbSerGetNextIrp");
UsbSerSerialDump(USBSERTRACEOTH | USBSERTRACERD | USBSERTRACEWR,
("<UsbSerGetNextIrp\n"));
}
NTSTATUS
UsbSerStartOrQueue(IN PDEVICE_EXTENSION PDevExt, IN PIRP PIrp,
IN PLIST_ENTRY PQueue, IN PIRP *PPCurrentIrp,
IN PUSBSER_START_ROUTINE Starter)
/*++
Routine Description:
This function is used to either start processing an I/O request or to
queue it on the appropriate queue if a request is already pending or
requests may not be started.
Arguments:
PDevExt - A pointer to the DeviceExtension.
PIrp - A pointer to the IRP that is being started or queued.
PQueue - A pointer to the queue to place the IRP on if necessary.
PPCurrentIrp - A pointer to the pointer to the currently active I/O IRP.
Starter - Function to call if we decide to start this IRP.
Return Value:
NTSTATUS
--*/
{
KIRQL oldIrql;
NTSTATUS status;
USBSER_ALWAYS_LOCKED_CODE();
DEBUG_LOG_PATH("Enter UsbSerStartOrQueue");
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerStartOrQueue(%08X)\n", PIrp));
ACQUIRE_CANCEL_SPINLOCK(PDevExt, &oldIrql);
if (IsListEmpty(PQueue) && (*PPCurrentIrp == NULL)) {
//
// Nothing pending -- start the new irp
//
*PPCurrentIrp = PIrp;
RELEASE_CANCEL_SPINLOCK(PDevExt, oldIrql);
status = Starter(PDevExt);
DEBUG_LOG_PATH("Exit UsbSerStartOrQueue(1)");
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerStartOrQueue(1) %08X\n",
status));
return status;
}
//
// We're queueing the irp, so we need a cancel routine -- make sure
// the irp hasn't already been cancelled.
//
if (PIrp->Cancel) {
//
// The IRP was apparently cancelled. Complete it.
//
RELEASE_CANCEL_SPINLOCK(PDevExt, oldIrql);
PIrp->IoStatus.Status = STATUS_CANCELLED;
IoCompleteRequest(PIrp, IO_NO_INCREMENT);
DEBUG_LOG_PATH("Exit UsbSerStartOrQueue(2)");
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerStartOrQueue(2) %08X\n",
STATUS_CANCELLED));
return STATUS_CANCELLED;
}
//
// Mark as pending, attach our cancel routine
//
PIrp->IoStatus.Status = STATUS_PENDING;
IoMarkIrpPending(PIrp);
InsertTailList(PQueue, &PIrp->Tail.Overlay.ListEntry);
IoSetCancelRoutine(PIrp, UsbSerCancelQueued);
RELEASE_CANCEL_SPINLOCK(PDevExt, oldIrql);
DEBUG_LOG_PATH("Exit UsbSerStartOrQueue(3)");
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerStartOrQueue(3) %08X\n",
STATUS_PENDING));
return STATUS_PENDING;
}
VOID
UsbSerCancelQueued(IN PDEVICE_OBJECT PDevObj, IN PIRP PIrp)
/*++
Routine Description:
This function is used as a cancel routine for queued irps. Basically
for us this means read IRPs.
Arguments:
PDevObj - A pointer to the serial device object.
PIrp - A pointer to the IRP that is being cancelled
Return Value:
VOID
--*/
{
PDEVICE_EXTENSION pDevExt = PDevObj->DeviceExtension;
PIO_STACK_LOCATION pIrpSp = IoGetCurrentIrpStackLocation(PIrp);
USBSER_ALWAYS_LOCKED_CODE();
DEBUG_LOG_PATH("Enter UsbSerCancelQueued");
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerCancelQueued(%08X)\n", PIrp));
//
// The irp was cancelled -- remove it from the queue
//
PIrp->IoStatus.Status = STATUS_CANCELLED;
PIrp->IoStatus.Information = 0;
RemoveEntryList(&PIrp->Tail.Overlay.ListEntry);
RELEASE_CANCEL_SPINLOCK(pDevExt, PIrp->CancelIrql);
IoCompleteRequest(PIrp, IO_SERIAL_INCREMENT);
DEBUG_LOG_PATH("Exit UsbSerCancelQueued");
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerCancelQueued\n"));
}
VOID
UsbSerKillAllReadsOrWrites(IN PDEVICE_OBJECT PDevObj,
IN PLIST_ENTRY PQueueToClean,
IN PIRP *PpCurrentOpIrp)
/*++
Routine Description:
This function is used to cancel all queued and the current irps
for reads or for writes.
Arguments:
PDevObj - A pointer to the serial device object.
PQueueToClean - A pointer to the queue which we're going to clean out.
PpCurrentOpIrp - Pointer to a pointer to the current irp.
Return Value:
None.
--*/
{
KIRQL cancelIrql;
PDRIVER_CANCEL cancelRoutine;
PDEVICE_EXTENSION pDevExt = PDevObj->DeviceExtension;
USBSER_ALWAYS_LOCKED_CODE();
UsbSerSerialDump(USBSERTRACERD | USBSERTRACEWR,
(">UsbSerKillAllReadsOrWrites(%08X)\n", *PpCurrentOpIrp));
//
// We acquire the cancel spin lock. This will prevent the
// irps from moving around.
//
ACQUIRE_CANCEL_SPINLOCK(pDevExt, &cancelIrql);
//
// Clean the list from back to front.
//
while (!IsListEmpty(PQueueToClean)) {
PIRP pCurrentLastIrp = CONTAINING_RECORD(PQueueToClean->Blink, IRP,
Tail.Overlay.ListEntry);
RemoveEntryList(PQueueToClean->Blink);
cancelRoutine = pCurrentLastIrp->CancelRoutine;
pCurrentLastIrp->CancelIrql = cancelIrql;
pCurrentLastIrp->CancelRoutine = NULL;
pCurrentLastIrp->Cancel = TRUE;
cancelRoutine(PDevObj, pCurrentLastIrp);
ACQUIRE_CANCEL_SPINLOCK(pDevExt, &cancelIrql);
}
//
// The queue is clean. Now go after the current if
// it's there.
//
if (*PpCurrentOpIrp) {
cancelRoutine = (*PpCurrentOpIrp)->CancelRoutine;
(*PpCurrentOpIrp)->Cancel = TRUE;
//
// If the current irp is not in a cancelable state
// then it *will* try to enter one and the above
// assignment will kill it. If it already is in
// a cancelable state then the following will kill it.
//
if (cancelRoutine) {
(*PpCurrentOpIrp)->CancelRoutine = NULL;
(*PpCurrentOpIrp)->CancelIrql = cancelIrql;
//
// This irp is already in a cancelable state. We simply
// mark it as canceled and call the cancel routine for
// it.
//
cancelRoutine(PDevObj, *PpCurrentOpIrp);
} else {
RELEASE_CANCEL_SPINLOCK(pDevExt, cancelIrql);
}
} else {
RELEASE_CANCEL_SPINLOCK(pDevExt, cancelIrql);
}
UsbSerSerialDump(USBSERTRACERD | USBSERTRACEWR,
("<UsbSerKillAllReadsOrWrites\n"));
}
VOID
UsbSerKillPendingIrps(PDEVICE_OBJECT PDevObj)
/*++
Routine Description:
Kill all IRPs queued in our driver
Arguments:
PDevObj - a pointer to the device object
Return Value:
VOID
--*/
{
PDEVICE_EXTENSION pDevExt = PDevObj->DeviceExtension;
KIRQL cancelIrql;
USBSER_ALWAYS_LOCKED_CODE();
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerKillPendingIrps\n"));
//
// Kill all reads; we do not queue writes
//
UsbSerKillAllReadsOrWrites(PDevObj, &pDevExt->ReadQueue,
&pDevExt->CurrentReadIrp);
//
// Get rid of any pending waitmasks
//
ACQUIRE_CANCEL_SPINLOCK(pDevExt, &cancelIrql);
if (pDevExt->CurrentMaskIrp != NULL) {
PDRIVER_CANCEL cancelRoutine;
cancelRoutine = pDevExt->CurrentMaskIrp->CancelRoutine;
pDevExt->CurrentMaskIrp->Cancel = TRUE;
ASSERT(cancelRoutine);
if (cancelRoutine) {
pDevExt->CurrentMaskIrp->CancelRoutine = NULL;
pDevExt->CurrentMaskIrp->CancelIrql = cancelIrql;
cancelRoutine(PDevObj, pDevExt->CurrentMaskIrp);
} else {
RELEASE_CANCEL_SPINLOCK(pDevExt, cancelIrql);
}
}else {
RELEASE_CANCEL_SPINLOCK(pDevExt, cancelIrql);
}
//
// Cancel any pending wait-wake irps
//
if (pDevExt->PendingWakeIrp != NULL) {
IoCancelIrp(pDevExt->PendingWakeIrp);
pDevExt->PendingWakeIrp = NULL;
}
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerKillPendingIrps\n"));
}
/************************************************************************/
/* CompletePendingWaitMasks */
/************************************************************************/
/* */
/* Routine Description: */
/* */
/* Completes any wait masks in progress with no events set. */
/* */
/* Arguments: */
/* */
/* DeviceExtension - pointer to a device extension */
/* */
/* Return Value: */
/* */
/* VOID */
/* */
/************************************************************************/
VOID
UsbSerCompletePendingWaitMasks(IN PDEVICE_EXTENSION DeviceExtension)
{
KIRQL OldIrql;
PIRP CurrentMaskIrp;
KIRQL cancelIrql;
USBSER_ALWAYS_LOCKED_CODE();
DEBUG_LOG_PATH("enter CompletePendingWaitMasks");
UsbSerSerialDump(USBSERTRACEOTH, (">CompletePendingWaitMasks\n"));
ACQUIRE_CANCEL_SPINLOCK(DeviceExtension, &cancelIrql);
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &OldIrql);
CurrentMaskIrp = DeviceExtension->CurrentMaskIrp;
if (CurrentMaskIrp) {
CurrentMaskIrp->IoStatus.Status = STATUS_SUCCESS;
CurrentMaskIrp->IoStatus.Information = sizeof(ULONG);
*((PULONG)CurrentMaskIrp->AssociatedIrp.SystemBuffer) = 0;
DeviceExtension->CurrentMaskIrp = NULL;
IoSetCancelRoutine(CurrentMaskIrp, NULL);
}
// complete the queued IRP if needed
if (CurrentMaskIrp) {
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
RELEASE_CANCEL_SPINLOCK(DeviceExtension, cancelIrql);
IoCompleteRequest(CurrentMaskIrp, IO_NO_INCREMENT);
DEBUG_TRACE1(("CompletePendingWaitMask\n"));
}
else
{
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, OldIrql);
RELEASE_CANCEL_SPINLOCK(DeviceExtension, cancelIrql);
}
DEBUG_LOG_PATH("exit CompletePendingWaitMasks");
UsbSerSerialDump(USBSERTRACEOTH, ("<CompletePendingWaitMasks\n"));
} // CancelPendingWaitMasks
VOID
UsbSerRestoreModemSettings(PDEVICE_OBJECT PDevObj)
/*++
Routine Description:
Restores the modem's settings upon a powerup.
Arguments:
PDevExt - a pointer to the device extension
Return Value:
VOID
--*/
{
PAGED_CODE();
(void)SetLineControlAndBaud(PDevObj);
}
VOID
UsbSerProcessEmptyTransmit(IN PDEVICE_EXTENSION PDevExt)
/*++
Routine Description:
This function is called whenever our tx queue is empty in order
to set the proper events, etc.
Arguments:
PDevExt - Pointer to DeviceExtension for the device
Return Value:
VOID
--*/
{
KIRQL oldIrql;
PULONG pWaitMask;
USBSER_ALWAYS_LOCKED_CODE();
//
// Set the event if needed
//
PDevExt->HistoryMask |= SERIAL_EV_TXEMPTY;
if (PDevExt->IsrWaitMask & SERIAL_EV_TXEMPTY) {
PIRP pMaskIrp;
DEBUG_TRACE3(("Completing events\n"));
ACQUIRE_CANCEL_SPINLOCK(PDevExt, &oldIrql);
if (PDevExt->CurrentMaskIrp != NULL) {
pWaitMask = (PULONG)PDevExt->CurrentMaskIrp->
AssociatedIrp.SystemBuffer;
*pWaitMask = PDevExt->HistoryMask;
PDevExt->HistoryMask = 0;
pMaskIrp = PDevExt->CurrentMaskIrp;
pMaskIrp->IoStatus.Information = sizeof(ULONG);
pMaskIrp->IoStatus.Status = STATUS_SUCCESS;
PDevExt->CurrentMaskIrp = NULL;
IoSetCancelRoutine(pMaskIrp, NULL);
RELEASE_CANCEL_SPINLOCK(PDevExt, oldIrql);
IoCompleteRequest(pMaskIrp, IO_SERIAL_INCREMENT);
} else {
RELEASE_CANCEL_SPINLOCK(PDevExt, oldIrql);
}
}
}
VOID
UsbSerCancelWaitOnMask(IN PDEVICE_OBJECT PDevObj, IN PIRP PIrp)
/*++
Routine Description:
This function is used as a cancel routine for WaitOnMask IRPs.
Arguments:
PDevObj - Pointer to Device Object
PIrp - Pointer to IRP that is being canceled; must be the same as
the current mask IRP.
Return Value:
VOID
--*/
{
PDEVICE_EXTENSION pDevExt = (PDEVICE_EXTENSION)PDevObj->DeviceExtension;
USBSER_ALWAYS_LOCKED_CODE();
UsbSerSerialDump(USBSERTRACEOTH, (">UsbSerCancelWaitOnMask(%08X)\n", PIrp));
ASSERT(pDevExt->CurrentMaskIrp == PIrp);
PIrp->IoStatus.Status = STATUS_CANCELLED;
PIrp->IoStatus.Information = 0;
pDevExt->CurrentMaskIrp = NULL;
RELEASE_CANCEL_SPINLOCK(pDevExt, PIrp->CancelIrql);
IoCompleteRequest(PIrp, IO_SERIAL_INCREMENT);
UsbSerSerialDump(USBSERTRACEOTH, ("<UsbSerCancelWaitOnMask(%08X)"));
}
NTSTATUS
UsbSerSyncCompletion(IN PDEVICE_OBJECT PDevObj, IN PIRP PIrp,
IN PKEVENT PUsbSerSyncEvent)
/*++
Routine Description:
This function is used to signal an event. It is used as a completion
routine.
Arguments:
PDevObj - Pointer to Device Object
PIrp - Pointer to IRP that is being completed
PUsbSerSyncEvent - Pointer to event that we should set
Return Value:
STATUS_MORE_PROCESSING_REQUIRED
--*/
{
KeSetEvent(PUsbSerSyncEvent, IO_NO_INCREMENT, FALSE);
return STATUS_MORE_PROCESSING_REQUIRED;
}
#if DBG
PVOID
UsbSerLockPagableCodeSection(PVOID SecFunc)
/*++
Routine Description:
This function is used to lockdown code pages and increment a lock counter
for debugging.
Arguments:
SecFunc - Function in code section to be locked down.
Return Value:
PVOID - Handle for locked down section.
--*/
{ PVOID handle;
PAGED_CODE();
handle = MmLockPagableCodeSection(SecFunc);
// can this be paged?
InterlockedIncrement(&PAGEUSBSER_Count);
return handle;
}
#endif
VOID
UsbSerFetchBooleanLocked(PBOOLEAN PDest, BOOLEAN Src, PKSPIN_LOCK PSpinLock)
/*++
Routine Description:
This function is used to assign a BOOLEAN value with spinlock protection.
Arguments:
PDest - A pointer to Lval.
Src - Rval.
PSpinLock - Pointer to the spin lock we should hold.
Return Value:
None.
--*/
{
KIRQL tmpIrql;
KeAcquireSpinLock(PSpinLock, &tmpIrql);
*PDest = Src;
KeReleaseSpinLock(PSpinLock, tmpIrql);
}
VOID
UsbSerFetchPVoidLocked(PVOID *PDest, PVOID Src, PKSPIN_LOCK PSpinLock)
/*++
Routine Description:
This function is used to assign a PVOID value with spinlock protection.
Arguments:
PDest - A pointer to Lval.
Src - Rval.
PSpinLock - Pointer to the spin lock we should hold.
Return Value:
None.
--*/
{
KIRQL tmpIrql;
KeAcquireSpinLock(PSpinLock, &tmpIrql);
*PDest = Src;
KeReleaseSpinLock(PSpinLock, tmpIrql);
}
/*++
Routine Description:
Work item to kick off another notify read
Arguments:
DeviceObject - pointer to the device object
DeviceExtension - context for this call
Return Value:
None.
--*/
VOID
USBSER_RestartNotifyReadWorkItem(IN PDEVICE_OBJECT DeviceObject, IN PDEVICE_EXTENSION DeviceExtension)
{
KIRQL oldIrql;
PIO_WORKITEM ioWorkItem;
ACQUIRE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, &oldIrql);
ioWorkItem = DeviceExtension->IoWorkItem;
DeviceExtension->IoWorkItem = NULL;
RELEASE_SPINLOCK(DeviceExtension, &DeviceExtension->ControlLock, oldIrql);
IoFreeWorkItem(ioWorkItem);
RestartNotifyRead(DeviceExtension);
} // USBER_RestartNotifyReadWorkItem