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////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2012 Microsoft Corporation. All Rights Reserved.
//
// Module Name:
// Framework_PowerStates.cpp
//
// Abstract:
//
// Author:
// Dusty Harper (DHarper)
//
// Revision History:
//
// [ Month ][Day] [Year] - [Revision]-[ Comments ]
// May 01, 2010 - 1.0 - Creation
//
////////////////////////////////////////////////////////////////////////////////////////////////////
#include "Framework_WFPSamplerCalloutDriver.h" /// .
#include "Framework_PowerStates.tmh" /// $(OBJ_PATH)\$(O)\
/**
@framework_function="PowerStateCallback"
Purpose: Callback which handles various power state transitions for the callout driver. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_IRQL_requires_same_
_Function_class_(CALLBACK_FUNCTION)
VOID PowerStateCallback(_In_ VOID* pCallbackContext,
_In_ VOID* pPowerStateEvent,
_In_ VOID* pEventSpecifics)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> PowerStateCallback()\n");
#endif /// DBG
UNREFERENCED_PARAMETER(pCallbackContext);
if(pPowerStateEvent == (VOID*)PO_CB_SYSTEM_STATE_LOCK)
{
NTSTATUS status = STATUS_SUCCESS;
if(pEventSpecifics)
{
/// entering the ON state (S0), so return operation to normal
if(g_calloutsRegistered == FALSE)
{
status = KrnlHlprExposedCalloutsRegister();
HLPR_BAIL_ON_FAILURE(status);
g_calloutsRegistered = TRUE;
}
}
else
{
/// leaving the ON state (S0) to sleep (S1/S2/S3) or hibernate (S4)
/// Unregister the callouts so no more injection will take place. By default, the filters
/// invoking the callouts will return block.
if(g_calloutsRegistered == TRUE)
{
status = KrnlHlprExposedCalloutsUnregister();
HLPR_BAIL_ON_FAILURE(status);
g_calloutsRegistered = FALSE;
}
}
}
HLPR_BAIL_LABEL:
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- PowerStateCallback()\n");
#endif /// DBG
return;
}
/**
@framework_function="RegisterPowerStateChangeCallback"
Purpose: Unregister a callback that handled notifications of power state changes. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/FF545649.aspx <br>
HTTP://MSDN.Microsoft.com/En-US/Library/FF547724.aspx <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(APC_LEVEL)
_IRQL_requires_same_
VOID UnregisterPowerStateChangeCallback(_Inout_ DEVICE_EXTENSION* pDeviceExtension)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> UnregisterPowerStateChangeCallback()\n");
#endif /// DBG
NT_ASSERT(pDeviceExtension);
if(pDeviceExtension->pRegistration)
{
ExUnregisterCallback(pDeviceExtension->pRegistration);
pDeviceExtension->pRegistration = 0;
}
if(pDeviceExtension->pCallbackObject)
{
ObDereferenceObject(pDeviceExtension->pCallbackObject);
pDeviceExtension->pCallbackObject = 0;
}
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- UnregisterPowerStateChangeCallback()\n");
#endif /// DBG
return;
}
/**
@framework_function="RegisterPowerStateChangeCallback"
Purpose: Create and register a callback to handle notifications of power state changes. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/FF544560.aspx <br>
HTTP://MSDN.Microsoft.com/En-US/Library/FF545534.aspx <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(APC_LEVEL)
_IRQL_requires_same_
_Success_(return == STATUS_SUCCESS)
NTSTATUS RegisterPowerStateChangeCallback(_Inout_ DEVICE_EXTENSION* pDeviceExtension)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> RegisterPowerStateChangeCallback()\n");
#endif /// DBG
NT_ASSERT(pDeviceExtension);
NTSTATUS status = STATUS_SUCCESS;
OBJECT_ATTRIBUTES objectAttributes = {0};
UNICODE_STRING unicodeString = {0};
RtlInitUnicodeString(&unicodeString,
L"\\Callback\\PowerState");
InitializeObjectAttributes(&objectAttributes,
&unicodeString,
OBJ_CASE_INSENSITIVE,
0,
0);
status = ExCreateCallback(&(pDeviceExtension->pCallbackObject),
&objectAttributes,
FALSE, /// Do not create as the system should already have done this
TRUE); /// Allow multiple callbacks
if(status != STATUS_SUCCESS)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! RegisterPowerStateChangeCallback : ExCreateCallback() [status: %#x]\n",
status);
HLPR_BAIL;
}
pDeviceExtension->pRegistration = ExRegisterCallback(pDeviceExtension->pCallbackObject,
PowerStateCallback,
pDeviceExtension);
HLPR_BAIL_LABEL:
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- RegisterPowerStateChangeCallback() [status: %#x]\n",
status);
#endif /// DBG
return status;
}
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