197 lines
4.5 KiB
C
197 lines
4.5 KiB
C
/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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power.c
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Abstract: NULL filter driver -- boilerplate code
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Author:
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ervinp
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include <WDM.H>
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#include "filter.h"
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NTSTATUS VA_Power(struct DEVICE_EXTENSION *devExt, PIRP irp)
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/*++
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Routine Description:
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Dispatch routine for Power IRPs (MajorFunction == IRP_MJ_Power)
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Note: We may or may not have set the DO_POWER_PAGABLE bit
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for the filter device object in AddDevice().
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Therefore, we don't know whether or not this function
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can be called at DISPATCH_LEVEL; so the power-handling
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code must be locked.
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Arguments:
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devExt - device extension for targetted device object
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irp - Io Request Packet
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Return Value:
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NT status code
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--*/
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{
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PIO_STACK_LOCATION irpSp;
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NTSTATUS status;
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irpSp = IoGetCurrentIrpStackLocation(irp);
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DBGOUT(("VA_Power, minorFunc = %d ", (ULONG)irpSp->MinorFunction));
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switch (irpSp->MinorFunction){
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case IRP_MN_SET_POWER:
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switch (irpSp->Parameters.Power.Type) {
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case SystemPowerState:
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/*
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* For system power states, just pass the IRP down.
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*/
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break;
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case DevicePowerState:
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switch (irpSp->Parameters.Power.State.DeviceState) {
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case PowerDeviceD0:
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/*
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* Resume from APM Suspend
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*
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* Do nothing here;
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* Send down the read IRPs in the completion
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* routine for this (the power) IRP.
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*/
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break;
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case PowerDeviceD1:
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case PowerDeviceD2:
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case PowerDeviceD3:
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/*
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* Suspend
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*/
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if (devExt->state == STATE_STARTED){
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devExt->state = STATE_SUSPENDED;
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}
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break;
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}
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break;
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}
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break;
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}
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/*
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* Whether we are completing or relaying this power IRP,
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* we must call PoStartNextPowerIrp.
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*/
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PoStartNextPowerIrp(irp);
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/*
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* Send the IRP down the driver stack,
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* using PoCallDriver (not IoCallDriver, as for non-power irps).
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*/
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IoCopyCurrentIrpStackLocationToNext(irp);
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IncrementPendingActionCount(devExt);
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IoSetCompletionRoutine( irp,
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VA_PowerComplete,
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(PVOID)devExt, // context
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TRUE,
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TRUE,
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TRUE);
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status = PoCallDriver(devExt->physicalDevObj, irp);
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return status;
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}
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NTSTATUS VA_PowerComplete(
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IN PDEVICE_OBJECT devObj,
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IN PIRP irp,
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IN PVOID context)
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/*++
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Routine Description:
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Completion routine for Power IRPs (MajorFunction == IRP_MJ_Power)
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Arguments:
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devObj - targetted device object
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irp - Io Request Packet
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context - context value passed to IoSetCompletionRoutine by VA_Power
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Return Value:
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NT status code
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--*/
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{
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PIO_STACK_LOCATION irpSp;
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struct DEVICE_EXTENSION *devExt = (struct DEVICE_EXTENSION *)context;
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ASSERT(devExt);
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ASSERT(devExt->signature == DEVICE_EXTENSION_SIGNATURE);
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irpSp = IoGetCurrentIrpStackLocation(irp);
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ASSERT(irpSp->MajorFunction == IRP_MJ_POWER);
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if (NT_SUCCESS(irp->IoStatus.Status)){
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switch (irpSp->MinorFunction){
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case IRP_MN_SET_POWER:
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switch (irpSp->Parameters.Power.Type){
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case DevicePowerState:
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switch (irpSp->Parameters.Power.State.DeviceState){
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case PowerDeviceD0:
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if (devExt->state == STATE_SUSPENDED){
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devExt->state = STATE_STARTED;
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}
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break;
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}
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break;
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}
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break;
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}
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}
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/*
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* Decrement the pendingActionCount, which we incremented in VA_Power.
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*/
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DecrementPendingActionCount(devExt);
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return STATUS_SUCCESS;
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}
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