isopnp.c

WINDDK开发代码

    Irp->IoStatus.Status = STATUS_SUCCESS;
    Irp->IoStatus.Information = 0;

    IoSkipCurrentIrpStackLocation(Irp);
    ntStatus = IoCallDriver(deviceExtension->TopOfStackDeviceObject, Irp);

    IsoUsb_DbgPrint(3, ("HandleSurpriseRemoval - ends\n"));

    return ntStatus;
}

NTSTATUS
HandleRemoveDevice(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP           Irp
    )
/*++
 
Routine Description:

    This routine services Irp of minor type IRP_MN_REMOVE_DEVICE

Arguments:

    DeviceObject - pointer to device object
    Irp - I/O request packet sent by the pnp manager.

Return Value:

    NT status value

--*/
{
    KIRQL             oldIrql;
    KEVENT            event;
    ULONG             requestCount;
    NTSTATUS          ntStatus;
    PDEVICE_EXTENSION deviceExtension;

    IsoUsb_DbgPrint(3, ("HandleRemoveDevice - begins\n"));

    //
    // initialize variables
    //

    deviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;

    //
    // The Plug & Play system has dictated the removal of this device.  We
    // have no choice but to detach and delete the device object.
    // (If we wanted to express an interest in preventing this removal,
    // we should have failed the query remove IRP).
    //

    if(SurpriseRemoved != deviceExtension->DeviceState) {

        //
        // we are here after QUERY_REMOVE
        //

        KeAcquireSpinLock(&deviceExtension->DevStateLock, &oldIrql);

        deviceExtension->QueueState = FailRequests;
        
        KeReleaseSpinLock(&deviceExtension->DevStateLock, oldIrql);

        if(deviceExtension->WaitWakeEnable) {
        
            CancelWaitWake(deviceExtension);
        }

        if(WinXpOrBetter == deviceExtension->WdmVersion) {

            if(deviceExtension->SSEnable) {
                //
                // Cancel the timer so that the DPCs are no longer fired.
                // we do not need DPCs because the device has been removed
                //
                KeCancelTimer(&deviceExtension->Timer);

                deviceExtension->SSEnable = 0;

                //
                // make sure that if a DPC was fired before we called cancel timer,
                // then the DPC and work-time have run to their completion
                //
                KeWaitForSingleObject(&deviceExtension->NoDpcWorkItemPendingEvent, 
                                      Executive, 
                                      KernelMode, 
                                      FALSE, 
                                      NULL);

                //
                // make sure that the selective suspend request has been completed.
                //
                KeWaitForSingleObject(&deviceExtension->NoIdleReqPendEvent, 
                                      Executive, 
                                      KernelMode, 
                                      FALSE, 
                                      NULL);
            }
        }

        ProcessQueuedRequests(deviceExtension);

        ntStatus = IoSetDeviceInterfaceState(&deviceExtension->InterfaceName, 
                                             FALSE);

        if(!NT_SUCCESS(ntStatus)) {

            IsoUsb_DbgPrint(1, ("IoSetDeviceInterfaceState::disable:failed\n"));
        }

        IsoUsb_AbortPipes(DeviceObject);


    }

    KeAcquireSpinLock(&deviceExtension->DevStateLock, &oldIrql);

    SET_NEW_PNP_STATE(deviceExtension, Removed);
    
    KeReleaseSpinLock(&deviceExtension->DevStateLock, oldIrql);
    
    IsoUsb_WmiDeRegistration(deviceExtension);

    //
    // need 2 decrements
    //

    IsoUsb_DbgPrint(3, ("HandleRemoveDevice::"));
    requestCount = IsoUsb_IoDecrement(deviceExtension);

    ASSERT(requestCount > 0);

    IsoUsb_DbgPrint(3, ("HandleRemoveDevice::"));
    requestCount = IsoUsb_IoDecrement(deviceExtension);

    KeWaitForSingleObject(&deviceExtension->RemoveEvent, 
                          Executive, 
                          KernelMode, 
                          FALSE, 
                          NULL);

    ReleaseMemory(DeviceObject);

    //
    // We need to send the remove down the stack before we detach,
    // but we don't need to wait for the completion of this operation
    // (and to register a completion routine).
    //

    Irp->IoStatus.Status = STATUS_SUCCESS;
    Irp->IoStatus.Information = 0;

    IoSkipCurrentIrpStackLocation(Irp);
    ntStatus = IoCallDriver(deviceExtension->TopOfStackDeviceObject, Irp);
    //
    // Detach the FDO from the device stack
    //
    IoDetachDevice(deviceExtension->TopOfStackDeviceObject);
    IoDeleteDevice(DeviceObject);

    IsoUsb_DbgPrint(3, ("HandleRemoveDevice - ends\n"));

    return ntStatus;
}

NTSTATUS
HandleQueryCapabilities(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP           Irp
    )
/*++
 
Routine Description:

    This routine services Irp of minor type IRP_MN_QUERY_CAPABILITIES

Arguments:

    DeviceObject - pointer to device object
    Irp - I/O request packet sent by the pnp manager.

Return Value:

    NT status value  

--*/
{
    ULONG                i;
    KEVENT               event;
    NTSTATUS             ntStatus;
    PDEVICE_EXTENSION    deviceExtension;
    PDEVICE_CAPABILITIES pdc;
    PIO_STACK_LOCATION   irpStack;

    IsoUsb_DbgPrint(3, ("HandleQueryCapabilities - begins\n"));

    //
    // initialize variables
    //

    irpStack = IoGetCurrentIrpStackLocation(Irp);
    deviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
    pdc = irpStack->Parameters.DeviceCapabilities.Capabilities;

    //
    // We will provide here an example of an IRP that is processed
    // both on its way down and on its way up: there might be no need for
    // a function driver process this Irp (the bus driver will do that).
    // The driver will wait for the lower drivers (the bus driver among 
    // them) to process this IRP, then it processes it again.
    //

    if(pdc->Version < 1 || pdc->Size < sizeof(DEVICE_CAPABILITIES)) {
        
        IsoUsb_DbgPrint(1, ("HandleQueryCapabilities::request failed\n"));
        ntStatus = STATUS_UNSUCCESSFUL;
        return ntStatus;
    }

    //
    // Set some values in deviceCapabilities here...
    //
    //.............................................
    //
    //
    // Prepare to pass the IRP down
    //

    //
    // Add in the SurpriseRemovalOK bit before passing it down.
    //
    pdc->SurpriseRemovalOK = TRUE;
    Irp->IoStatus.Status = STATUS_SUCCESS;

    KeInitializeEvent(&event, NotificationEvent, FALSE);
        
    IoCopyCurrentIrpStackLocationToNext(Irp);
    IoSetCompletionRoutine(Irp, 
                           (PIO_COMPLETION_ROUTINE)IrpCompletionRoutine, 
                           (PVOID)&event, 
                           TRUE, 
                           TRUE, 
                           TRUE);
    ntStatus = IoCallDriver(deviceExtension->TopOfStackDeviceObject, Irp);

    if(ntStatus == STATUS_PENDING) {

        KeWaitForSingleObject(&event, 
                              Executive, 
                              KernelMode, 
                              FALSE, 
                              NULL);
        ntStatus = Irp->IoStatus.Status;
    }

    //
    // initialize PowerDownLevel to disabled
    //

    deviceExtension->PowerDownLevel = PowerDeviceUnspecified;

    if(NT_SUCCESS(ntStatus)) {

        deviceExtension->DeviceCapabilities = *pdc;
       
        for(i = PowerSystemSleeping1; i <= PowerSystemSleeping3; i++) {

            if(deviceExtension->DeviceCapabilities.DeviceState[i] < 
                                                            PowerDeviceD3) {

                deviceExtension->PowerDownLevel = 
                    deviceExtension->DeviceCapabilities.DeviceState[i];
            }
        }

        //
        // since its safe to surprise-remove this device, we shall
        // set the SurpriseRemoveOK flag to supress any dialog to 
        // user.
        //

        pdc->SurpriseRemovalOK = 1;
    }

    if(deviceExtension->PowerDownLevel == PowerDeviceUnspecified ||
       deviceExtension->PowerDownLevel <= PowerDeviceD0) {
    
        deviceExtension->PowerDownLevel = PowerDeviceD2;
    }

    IsoUsb_DbgPrint(3, ("HandleQueryCapabilities - ends\n"));

    return ntStatus;
}


VOID
DpcRoutine(
    IN PKDPC Dpc,
    IN PVOID DeferredContext,
    IN PVOID SystemArgument1,
    IN PVOID SystemArgument2
    )
/*++
 
Routine Description:

    DPC routine triggered by the timer to check the idle state
    of the device and submit an idle request for the device.

Arguments:

    DeferredContext - context for the dpc routine.
                      DeviceObject in our case.

Return Value:

    None

--*/
{
    NTSTATUS          ntStatus;
    PDEVICE_OBJECT    deviceObject;
    PDEVICE_EXTENSION deviceExtension;
    PIO_WORKITEM      item;

    IsoUsb_DbgPrint(3, ("DpcRoutine - begins\n"));

    deviceObject = (PDEVICE_OBJECT)DeferredContext;
    deviceExtension = (PDEVICE_EXTENSION)deviceObject->DeviceExtension;

    //
    // Clear this event since a DPC has been fired!
    //
    KeClearEvent(&deviceExtension->NoDpcWorkItemPendingEvent);

    if(CanDeviceSuspend(deviceExtension)) {

        IsoUsb_DbgPrint(3, ("Device is Idle\n"));

        item = IoAllocateWorkItem(deviceObject);

        if(item) {

            IoQueueWorkItem(item, 
                            IdleRequestWorkerRoutine,
                            DelayedWorkQueue, 
                            item);

            ntStatus = STATUS_PENDING;

        }
        else {
        
            IsoUsb_DbgPrint(3, ("Cannot alloc memory for work item\n"));
            
            ntStatus = STATUS_INSUFFICIENT_RESOURCES;

            //
            // signal the NoDpcWorkItemPendingEvent.
            //
            KeSetEvent(&deviceExtension->NoDpcWorkItemPendingEvent,
                       IO_NO_INCREMENT,
                       FALSE);
        }
    }
    else {
        
        IsoUsb_DbgPrint(3, ("Idle event not signaled\n"));

        //
        // signal the NoDpcWorkItemPendingEvent.
        //
        KeSetEvent(&deviceExtension->NoDpcWorkItemPendingEvent,
                   IO_NO_INCREMENT,
                   FALSE);
    }

    IsoUsb_DbgPrint(3, ("DpcRoutine - ends\n"));
}    


VOID
IdleRequestWorkerRoutine(
    IN PDEVICE_OBJECT DeviceObject,
    IN PVOID          Context
    )
/*++
 
Routine Description:

    This is the work item fired from the DPC.
    This workitem checks the idle state of the device
    and submits an idle request.

Arguments:

    DeviceObject - pointer to device object
    Context - context for the work item.

Return Value:

    None

--*/
{
    PIRP                   irp;
    NTSTATUS               ntStatus;
    PDEVICE_EXTENSION      deviceExtension;
    PIO_WORKITEM           workItem;

    IsoUsb_DbgPrint(3, ("IdleRequestWorkerRoutine - begins\n"));

    //
    // initialize variables
    //
    deviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
    workItem = (PIO_WORKITEM) Context;

    if(CanDeviceSuspend(deviceExtension)) {

        IsoUsb_DbgPrint(3, ("Device is idle\n"));

        ntStatus = SubmitIdleRequestIrp(deviceExtension);

        if(!NT_SUCCESS(ntStatus)) {

            IsoUsb_DbgPrint(1, ("SubmitIdleRequestIrp failed\n"));
        }
    }
    else {

        IsoUsb_DbgPrint(3, ("Device is not idle\n"));
    }

    IoFreeWorkItem(workItem);

    //
    // signal the NoDpcWorkItemPendingEvent.
    //
    KeSetEvent(&deviceExtension->NoDpcWorkItemPendingEvent,
               IO_NO_INCREMENT,
               FALSE);

    IsoUsb_DbgPrint(3, ("IdleRequestsWorkerRoutine - ends\n"));
}


VOID
ProcessQueuedRequests(
    IN OUT PDEVICE_EXTENSION DeviceExtension
    )
/*++
 
Routine Description:

    Remove and process the entries in the queue. If this routine is called
    when processing IRP_MN_CANCEL_STOP_DEVICE, IRP_MN_CANCEL_REMOVE_DEVICE
    or IRP_MN_START_DEVICE, the requests are passed to the next lower driver.
    If the routine is called when IRP_MN_REMOVE_DEVICE is received, the IRPs
    are complete with STATUS_DELETE_PENDING

Arguments:

    DeviceExtension - pointer to device extension

Return Value:

    None

--*/
{
    KIRQL       oldIrql;
    PIRP        nextIrp,
                cancelledIrp;
    PVOID       cancelRoutine;
    LIST_ENTRY  cancelledIrpList;
    PLIST_ENTRY listEntry;

    IsoUsb_DbgPrint(3, ("ProcessQueuedRequests - begins\n"));

    //
    // initialize variables
    //

    cancelRoutine = NULL;
    InitializeListHead(&cancelledIrpList);

    //
    // 1.  dequeue the entries in the queue