windows-xp/Source/XPSP1/NT/net/unimodem/sample/sys/power.c

/*
 * UNIMODEM "Fakemodem" controllerless driver illustrative example
 *
 * (C) 2000 Microsoft Corporation
 * All Rights Reserved
 *
 */

#include "fakemodem.h"

#ifdef FAKEMODEM_POWER
VOID
DevicePowerCompleteRoutine(
    PDEVICE_OBJECT    DeviceObject,
    IN UCHAR MinorFunction,
    IN POWER_STATE PowerState,
    IN PVOID Context,
    IN PIO_STATUS_BLOCK IoStatus
    )

{
    D_POWER(DbgPrint("FAKEMODEM: PoRequestPowerIrp: completion %08lx\n",IoStatus->Status);)

    return;
}
#endif


NTSTATUS
FakeModemPower(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp
    )
{

    PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;
    PIO_STACK_LOCATION irpSp = IoGetCurrentIrpStackLocation(Irp);
    NTSTATUS    status;

    POWER_STATE  PowerState;

    D_POWER(DbgPrint("FAKEMODEM: Power IRP, MN func=%d\n",irpSp->MinorFunction);)

#ifdef FAKEMODEM_POWER
    switch (irpSp->MinorFunction) {

        case IRP_MN_SET_POWER:

            D_POWER(DbgPrint("FAKEMODEM: IRP_MN_SET_POWER, Type=%s, state=%d\n",irpSp->Parameters.Power.Type == SystemPowerState ? "SystemPowerState" : "DevicePowerState",irpSp->Parameters.Power.State.SystemState);)

            if (irpSp->Parameters.Power.Type == SystemPowerState) {
                //
                //  system power state change
                //
                //
                //  request the change in device power state based on systemstate map
                //
                PowerState.DeviceState=deviceExtension->SystemPowerStateMap[irpSp->Parameters.Power.State.SystemState];


                PoRequestPowerIrp( deviceExtension->Pdo, IRP_MN_SET_POWER,
                    PowerState, DevicePowerCompleteRoutine, Irp, NULL);


            }  else {
                //
                //  changing device state
                //
                PoSetPowerState( deviceExtension->Pdo,
                    irpSp->Parameters.Power.Type,
                    irpSp->Parameters.Power.State);

            }

            break;

        case IRP_MN_QUERY_POWER:

            D_POWER(DbgPrint("FAKEMODEM: IRP_MN_QUERY_POWER, Type=%s, state=%d\n",irpSp->Parameters.Power.Type == SystemPowerState ? "SystemPowerState" : "DevicePowerState",irpSp->Parameters.Power.State.DeviceState);)

            Irp->IoStatus.Status = STATUS_SUCCESS;

            break;

        default:

            D_POWER(DbgPrint("FAKEMODEM: Power IRP, MN func=%d\n",irpSp->MinorFunction);)

            break;

    }
#endif



    PoStartNextPowerIrp(Irp);

    IoSkipCurrentIrpStackLocation(Irp);

    status=PoCallDriver(deviceExtension->LowerDevice, Irp);

    return status;
}