windows-server-2003/drivers/serveravailability/watchdog/power.cpp

/*++

Copyright (c) 1991 - 2001 Microsoft Corporation

Module Name:

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Abstract:

    This module process all power management IRPs.

Author:

    Wesley Witt (wesw) 1-Oct-2001

Environment:

    Kernel mode only.

Notes:


--*/

#include "internal.h"

#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE,WdPower)
#endif



NTSTATUS
WdPower(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp
    )
/*++

Routine Description:

Arguments:

    DeviceObject - a pointer to the object that represents the device
    that I/O is to be done on.

    Irp - a pointer to the I/O Request Packet for this request.

Return Value:

--*/
{
    NTSTATUS Status = STATUS_SUCCESS;
    PDEVICE_EXTENSION DeviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
    PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
    ULONG TimeoutValue;


    switch (IrpSp->MinorFunction) {
        case IRP_MN_WAIT_WAKE:
        case IRP_MN_POWER_SEQUENCE:
        case IRP_MN_QUERY_POWER:
            Status = STATUS_SUCCESS;
            break;

        case IRP_MN_SET_POWER:
            switch (IrpSp->Parameters.Power.State.SystemState) {
                case PowerSystemSleeping1:
                    //
                    // The system is being suspended
                    //
                    WdHandlerStopTimer( DeviceExtension );
                    break;

                case PowerSystemHibernate:
                    //
                    // The system is hibernating
                    //
                    WdHandlerStopTimer( DeviceExtension );
                    break;

                case PowerSystemWorking:
                    //
                    // The system is waking up from suspend/hibernate
                    //
                    WdHandlerStartTimer( DeviceExtension );
                    break;

                case PowerSystemShutdown:
                    //
                    // The system is shutting down normally
                    //
                    if (ShutdownCountTime > MIN_TIMEOUT_VALUE) {
                        TimeoutValue = ShutdownCountTime;
                    } else {
                        TimeoutValue = (ULONG)DeviceExtension->MaxCount;
                    }
                    WdHandlerSetTimeoutValue( DeviceExtension, TimeoutValue, TRUE );
                    switch (IrpSp->Parameters.Power.ShutdownType) {
                        case PowerActionShutdownOff:
                            TimeoutValue = 1;
                            break;

                        case PowerActionShutdownReset:
                            TimeoutValue = 0;
                            break;
                    }
                    WdHandlerSetTriggerAction( DeviceExtension, TimeoutValue );
                    break;
            }
            Status = STATUS_SUCCESS;
            break;

        default:
            Status = Irp->IoStatus.Status;
            break;
    }

    Irp->IoStatus.Status = Status;
    PoStartNextPowerIrp(Irp);
    IoSkipCurrentIrpStackLocation( Irp );
    return PoCallDriver( DeviceExtension->TargetObject, Irp );
}