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/*++
Copyright (c) 1990 Microsoft Corporation
Module Name:
misc.c
Abstract:
This module implements the power management
Author:
Ken Reneris (kenr) 19-July-1994
Revision History:
--*/
#include "pop.h"
#ifdef ALLOC_PRAGMA
#ifdef _PNP_POWER_
#pragma alloc_text(PAGE,PoInitializeDeviceObject)
#endif
#pragma alloc_text(PAGE,PoSetPowerManagementEnable)
#endif
#ifdef _PNP_POWER_
VOID
PoInitializeDeviceObject (
IN PDEVICE_OBJECT DeviceObject
)
{
PDEVOBJ_EXTENSION DeviceObjectExt;
DeviceObjectExt = DeviceObject->DeviceObjectExtension;
DeviceObjectExt->CurrentPowerState = PowerUp;
DeviceObjectExt->PendingPowerState = PowerUp;
DeviceObjectExt->PowerControlNeeded = TRUE;
DeviceObjectExt->UseAsyncPowerUp = TRUE;
KeInitializeDeviceQueue (&DeviceObjectExt->DeviceHoldingQueue);
PopLockDeviceList (FALSE);
//
// Add to global list of all device objects
//
InsertTailList (&PopDeviceList, &DeviceObjectExt->AllDeviceObjects);
PopUnlockDeviceList ();
}
VOID
PoRunDownDeviceObject (
IN PDEVICE_OBJECT DeviceObject
)
{
KIRQL OldIrql;
PDEVOBJ_EXTENSION DeviceObjectExt;
DeviceObjectExt = (PDEVOBJ_EXTENSION) DeviceObject->DeviceObjectExtension;
//
// Lock power management devicelist and state information
//
PopLockDeviceList (FALSE);
PopLockStateDatabase (&OldIrql);
//
// If in IdleScan list, remove it
//
if (DeviceObjectExt->IdleList.Flink) {
RemoveEntryList (&DeviceObjectExt->IdleList);
}
//
// Verify not busy
//
ASSERT (DeviceObjectExt->CurrentSetPowerIrp == NULL);
ASSERT (IsListEmpty (&DeviceObjectExt->DeviceHoldingQueue.DeviceListHead));
//
// If in PowerState change remove it
//
if (DeviceObjectExt->PowerStateChange.Flink) {
//
// Requent setting state to current state. That will
// remove it from the list.
//
PopRequestPowerChange (
DeviceObjectExt,
DeviceObjectExt->CurrentPowerState,
DeviceObjectExt->CurrentDevicePowerState
);
ASSERT (DeviceObjectExt->PowerStateChange.Flink);
}
//
// Remove from global list of all device objects
//
RemoveEntryList (&DeviceObjectExt->AllDeviceObjects);
//
// Unlock device list and state information
//
PopUnlockStateDatabase (OldIrql);
PopUnlockDeviceList ();
}
VOID
PoSetPowerManagementEnable (
IN BOOLEAN Enable
)
{
PoEnabled = Enable;
if (Enable) {
KeSetTimer (&PopIdleScanTimer, PopIdleScanTime, &PopIdleScanDpc);
}
}
POBJECT_NAME_INFORMATION
PopGetDeviceName (
PDEVICE_OBJECT DeviceObject
)
/*++
Routine Description:
Utility function to lookup the device object's name. If the
device objects name can't be found, then the driver objects
name is looked up.
--*/
{
POBJECT_NAME_INFORMATION ObjectName;
NTSTATUS Status;
ULONG ObjectNameSize, NewSize;
if (KeGetCurrentIrql() >= DISPATCH_LEVEL) {
return NULL;
}
ObjectName = (POBJECT_NAME_INFORMATION)
ExAllocatePool (PagedPool, sizeof (OBJECT_NAME_INFORMATION) + 100);
ObjectNameSize = sizeof (OBJECT_NAME_INFORMATION);
if (!ObjectName) {
return NULL;
}
//
// Get the name of the device object
//
for (; ;) {
NewSize = 0;
Status = ObQueryNameString (
DeviceObject,
ObjectName,
ObjectNameSize,
&NewSize
);
if (NewSize <= ObjectNameSize) {
break;
}
ExFreePool (ObjectName);
ObjectName = (POBJECT_NAME_INFORMATION) ExAllocatePool (PagedPool, NewSize);
ObjectNameSize = NewSize;
if (!ObjectName) {
break;
}
}
//
// If no device object name, get the driver object name
//
if (NT_SUCCESS(Status) && !ObjectName->Name.Length) {
for (; ;) {
NewSize = 0;
Status = ObQueryNameString (
DeviceObject->DriverObject,
ObjectName,
ObjectNameSize,
&NewSize
);
if (NewSize <= ObjectNameSize) {
break;
}
ExFreePool (ObjectName);
ObjectName = (POBJECT_NAME_INFORMATION) ExAllocatePool (PagedPool, NewSize);
ObjectNameSize = NewSize;
if (!ObjectName) {
break;
}
}
}
if (!ObjectName) {
return NULL;
}
if (!NT_SUCCESS(Status) || !ObjectName->Name.Length) {
ExFreePool (ObjectName);
return NULL;
}
return ObjectName;
}
#if DBG
PUCHAR
PopPowerState (
POWER_STATE PowerState
)
{
PUCHAR p;
switch (PowerState) {
case PowerUnspecified: p = "PowerUnspecified"; break;
case PowerUp: p = "PowerUp"; break;
case PowerQuery: p = "PowerQuery"; break;
case PowerStandby: p = "PowerStandby"; break;
case PowerSuspend: p = "PowerSuspend"; break;
case PowerHibernate: p = "PowerHibernate"; break;
case PowerDown: p = "PowerDown"; break;
case PowerDownRemove: p = "PowerDownRemove"; break;
default: p = "INVALID POWER STATE"; break;
}
return p;
}
#endif
#endif // _PNP_POWER_
ULONG
PoQueryPowerSequence (
VOID
)
{
#ifndef _PNP_POWER_
return 1;
#else
ASSERT (PoPowerSequence);
return PoPowerSequence;
#endif
}
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