//Copyright (C) Microsoft Corporation, All Rights Reserved. // //Abstract: // // This module contains the implementation of WDF callback functions // for sample custom sensor driver. // //Environment: // // Windows User-Mode Driver Framework (UMDF) #include "Device.h" #include "Device.tmh" // Custom sensor unique ID // {A8B27439-C671-401E-B4EF-43D700A5B411} // // TODO: The unique ID below must be set per sensor. A different GUID must be provided for each sensor. Please generate a new GUID. DEFINE_GUID(GUID_CustomSensorDevice_UniqueID, 0xa8b27439, 0xc671, 0x401e, 0xb4, 0xef, 0x43, 0xd7, 0x0, 0xa5, 0xb4, 0x11); // Custom sensor vendor defined type // // The following ID is defined by vendors and is unique to a custom sensor type. Each custom sensor driver should define one unique ID. // // TODO: The ID below identifies the custom sensor CO2 emulation sample driver. Please generate a new GUID for each new type of driver. // // {4025A865-638C-43AA-A688-98580961EEAE} DEFINE_GUID(GUID_CustomSensorDevice_VendorDefinedSubTypeID, 0x4025a865, 0x638c, 0x43aa, 0xa6, 0x88, 0x98, 0x58, 0x9, 0x61, 0xee, 0xae); // Vendor defined property keys // // A property key is defined by vendors for each datafield property a custom sensor driver exposes. Property keys are defined // per custom sensor driver and is unique to each custom sensor type. // // The following property key represents the CO2 level datafield exposed by this driver. // In this example only one key is defined, but other drivers may define more than one key by rev'ing up the property key index. // // TODO: The PROPERTYKEY below identifies the custom sensor CO2 level property key. Please generate a new GUID for each new type of driver. // // {74879888-a3cc-45c6-9ea9-058838256433} 1 DEFINE_PROPERTYKEY(PKEY_CustomSensorSampleData_CO2Level, 0x74879888, 0xa3cc, 0x45c6, 0x9e, 0xa9, 0x5, 0x88, 0x38, 0x25, 0x64, 0x33, 1); //[VT_R4] // This routine initializes the sensor to its default properties NTSTATUS CustomSensorDevice::Initialize( _In_ WDFDEVICE Device, // WDFDEVICE object _In_ SENSOROBJECT SensorInstance // SENSOROBJECT for each sensor instance ) { ULONG Size = 0; WDF_OBJECT_ATTRIBUTES MemoryAttributes; WDFMEMORY MemoryHandle = NULL; FILETIME Time = {}; WDF_OBJECT_ATTRIBUTES TimerAttributes; WDF_TIMER_CONFIG TimerConfig; NTSTATUS Status = STATUS_SUCCESS; SENSOR_FunctionEnter(); // Store device and instance m_FxDevice = Device; m_SensorInstance = SensorInstance; m_Started = FALSE; // Initialize the CO2 simulator HardwareSimulator::Initialize(Device, &m_SimulatorInstance); // Create Lock Status = WdfWaitLockCreate(WDF_NO_OBJECT_ATTRIBUTES, &m_Lock); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! WdfWaitLockCreate failed %!STATUS!", Status); goto Exit; } // Create timer object for polling sensor samples WDF_TIMER_CONFIG_INIT(&TimerConfig, CustomSensorDevice::OnTimerExpire); WDF_OBJECT_ATTRIBUTES_INIT(&TimerAttributes); TimerAttributes.ParentObject = SensorInstance; TimerAttributes.ExecutionLevel = WdfExecutionLevelPassive; Status = WdfTimerCreate(&TimerConfig, &TimerAttributes, &m_Timer); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! WdfTimerCreate failed %!STATUS!", Status); goto Exit; } // Sensor Enumeration Properties Size = SENSOR_COLLECTION_LIST_SIZE(SENSOR_ENUMERATION_PROPERTIES_COUNT); MemoryHandle = NULL; WDF_OBJECT_ATTRIBUTES_INIT(&MemoryAttributes); MemoryAttributes.ParentObject = SensorInstance; Status = WdfMemoryCreate(&MemoryAttributes, PagedPool, SENSORV2_POOL_TAG_CUSTOM_SENSOR, Size, &MemoryHandle, reinterpret_cast(&m_pEnumerationProperties)); if (!NT_SUCCESS(Status) || nullptr == m_pEnumerationProperties) { TraceError("CSTM %!FUNC! WdfMemoryCreate failed %!STATUS!", Status); goto Exit; } SENSOR_COLLECTION_LIST_INIT(m_pEnumerationProperties, Size); m_pEnumerationProperties->Count = SENSOR_ENUMERATION_PROPERTIES_COUNT; // The sensor type must be GUID_SensorType_Custom, the driver must also define and "vendor defined subtype" m_pEnumerationProperties->List[SENSOR_TYPE_GUID].Key = DEVPKEY_Sensor_Type; InitPropVariantFromCLSID(GUID_SensorType_Custom, &(m_pEnumerationProperties->List[SENSOR_TYPE_GUID].Value)); m_pEnumerationProperties->List[SENSOR_MANUFACTURER].Key = DEVPKEY_Sensor_Manufacturer; InitPropVariantFromString(L"Microsoft", &(m_pEnumerationProperties->List[SENSOR_MANUFACTURER].Value)); m_pEnumerationProperties->List[SENSOR_MODEL].Key = DEVPKEY_Sensor_Model; InitPropVariantFromString(L"CO2 based sample Custom sensor V2", &(m_pEnumerationProperties->List[SENSOR_MODEL].Value)); m_pEnumerationProperties->List[SENSOR_PERSISTENT_UNIQUEID].Key = DEVPKEY_Sensor_PersistentUniqueId; InitPropVariantFromCLSID(GUID_CustomSensorDevice_UniqueID, &(m_pEnumerationProperties->List[SENSOR_PERSISTENT_UNIQUEID].Value)); m_pEnumerationProperties->List[SENSOR_CATEGORY].Key = DEVPKEY_Sensor_Category; InitPropVariantFromCLSID(GUID_SensorCategory_Other, &(m_pEnumerationProperties->List[SENSOR_CATEGORY].Value)); m_pEnumerationProperties->List[SENSOR_ISPRIMARY].Key = DEVPKEY_Sensor_IsPrimary; InitPropVariantFromBoolean(FALSE, &(m_pEnumerationProperties->List[SENSOR_ISPRIMARY].Value)); // This value should be set to TRUE if multiple custom sensors // with the same vendor defined type exist on the system and // this sensor is the primary sensor m_pEnumerationProperties->List[SENSOR_VENDOR_DEFINED_TYPE].Key = DEVPKEY_Sensor_VendorDefinedSubType; InitPropVariantFromCLSID(GUID_CustomSensorDevice_VendorDefinedSubTypeID, &(m_pEnumerationProperties->List[SENSOR_VENDOR_DEFINED_TYPE].Value)); // Supported Data-Fields Size = SENSOR_PROPERTY_LIST_SIZE(CSTM_DATA_COUNT); MemoryHandle = NULL; WDF_OBJECT_ATTRIBUTES_INIT(&MemoryAttributes); MemoryAttributes.ParentObject = SensorInstance; Status = WdfMemoryCreate(&MemoryAttributes, PagedPool, SENSORV2_POOL_TAG_CUSTOM_SENSOR, Size, &MemoryHandle, reinterpret_cast(&m_pSupportedDataFields)); if (!NT_SUCCESS(Status) || nullptr == m_pSupportedDataFields) { TraceError("CSTM %!FUNC! WdfMemoryCreate failed %!STATUS!", Status); goto Exit; } SENSOR_PROPERTY_LIST_INIT(m_pSupportedDataFields, Size); m_pSupportedDataFields->Count = CSTM_DATA_COUNT; m_pSupportedDataFields->List[CSTM_DATA_TIMESTAMP] = PKEY_SensorData_Timestamp; m_pSupportedDataFields->List[CSTM_DATA_CO2_LEVEL_PERCENT] = PKEY_CustomSensorSampleData_CO2Level; // Data Size = SENSOR_COLLECTION_LIST_SIZE(CSTM_DATA_COUNT); MemoryHandle = NULL; WDF_OBJECT_ATTRIBUTES_INIT(&MemoryAttributes); MemoryAttributes.ParentObject = SensorInstance; Status = WdfMemoryCreate(&MemoryAttributes, PagedPool, SENSORV2_POOL_TAG_CUSTOM_SENSOR, Size, &MemoryHandle, reinterpret_cast(&m_pData)); if (!NT_SUCCESS(Status) || nullptr == m_pData) { TraceError("CSTM %!FUNC! WdfMemoryCreate failed %!STATUS!", Status); goto Exit; } SENSOR_COLLECTION_LIST_INIT(m_pData, Size); m_pData->Count = CSTM_DATA_COUNT; m_pData->List[CSTM_DATA_TIMESTAMP].Key = PKEY_SensorData_Timestamp; GetSystemTimePreciseAsFileTime(&Time); InitPropVariantFromFileTime(&Time, &(m_pData->List[CSTM_DATA_TIMESTAMP].Value)); // Initialize the sample, at this point of time the sensor is not started yet, // So, initialize the sample to a default value m_pData->List[CSTM_DATA_CO2_LEVEL_PERCENT].Key = PKEY_CustomSensorSampleData_CO2Level; InitPropVariantFromFloat(CustomSensorDevice_Minimum_CO2Level, &(m_pData->List[CSTM_DATA_CO2_LEVEL_PERCENT].Value)); // Sensor Properties m_Interval = Cstm_Default_MinDataInterval_Ms; Size = SENSOR_COLLECTION_LIST_SIZE(SENSOR_COMMON_PROPERTIES_COUNT); MemoryHandle = NULL; WDF_OBJECT_ATTRIBUTES_INIT(&MemoryAttributes); MemoryAttributes.ParentObject = SensorInstance; Status = WdfMemoryCreate(&MemoryAttributes, PagedPool, SENSORV2_POOL_TAG_CUSTOM_SENSOR, Size, &MemoryHandle, reinterpret_cast(&m_pProperties)); if (!NT_SUCCESS(Status) || nullptr == m_pProperties) { TraceError("CSTM %!FUNC! WdfMemoryCreate failed %!STATUS!", Status); goto Exit; } SENSOR_COLLECTION_LIST_INIT(m_pProperties, Size); m_pProperties->Count = SENSOR_COMMON_PROPERTIES_COUNT; m_pProperties->List[SENSOR_PROPERTY_STATE].Key = PKEY_Sensor_State; InitPropVariantFromUInt32(SensorState_Initializing, &(m_pProperties->List[SENSOR_PROPERTY_STATE].Value)); m_pProperties->List[SENSOR_PROPERTY_MIN_INTERVAL].Key = PKEY_Sensor_MinimumDataInterval_Ms; InitPropVariantFromUInt32(Cstm_Default_MinDataInterval_Ms, &(m_pProperties->List[SENSOR_PROPERTY_MIN_INTERVAL].Value)); m_pProperties->List[SENSOR_PROPERTY_MAX_DATAFIELDSIZE].Key = PKEY_Sensor_MaximumDataFieldSize_Bytes; InitPropVariantFromUInt32(CollectionsListGetMarshalledSize(m_pData), &(m_pProperties->List[SENSOR_PROPERTY_MAX_DATAFIELDSIZE].Value)); m_pProperties->List[SENSOR_PROPERTY_SENSOR_TYPE].Key = PKEY_Sensor_Type; InitPropVariantFromCLSID(GUID_SensorType_Custom, &(m_pProperties->List[SENSOR_PROPERTY_SENSOR_TYPE].Value)); // Data filed properties Size = SENSOR_COLLECTION_LIST_SIZE(SENSOR_DATA_FIELD_PROPERTY_COUNT); MemoryHandle = NULL; WDF_OBJECT_ATTRIBUTES_INIT(&MemoryAttributes); MemoryAttributes.ParentObject = SensorInstance; Status = WdfMemoryCreate(&MemoryAttributes, PagedPool, SENSORV2_POOL_TAG_CUSTOM_SENSOR, Size, &MemoryHandle, reinterpret_cast(&m_pDataFieldProperties)); if (!NT_SUCCESS(Status) || nullptr == m_pDataFieldProperties) { TraceError("CSTM %!FUNC! WdfMemoryCreate failed %!STATUS!", Status); goto Exit; } SENSOR_COLLECTION_LIST_INIT(m_pDataFieldProperties, Size); m_pDataFieldProperties->Count = SENSOR_DATA_FIELD_PROPERTY_COUNT; m_pDataFieldProperties->List[SENSOR_RESOLUTION].Key = PKEY_SensorDataField_Resolution; InitPropVariantFromFloat((float)CustomSensorDevice_Resolution, &(m_pDataFieldProperties->List[SENSOR_RESOLUTION].Value)); m_pDataFieldProperties->List[SENSOR_MIN_RANGE].Key = PKEY_SensorDataField_RangeMinimum; InitPropVariantFromFloat(CustomSensorDevice_Minimum_CO2Level, &(m_pDataFieldProperties->List[SENSOR_MIN_RANGE].Value)); m_pDataFieldProperties->List[SENSOR_MAX_RANGE].Key = PKEY_SensorDataField_RangeMaximum; InitPropVariantFromFloat(CustomSensorDevice_Maximum_CO2Level, &(m_pDataFieldProperties->List[SENSOR_MAX_RANGE].Value)); // Reset the FirstSample flag m_FirstSample = TRUE; Exit: SENSOR_FunctionExit(Status); return Status; } // This routine is the AddDevice entry point for the custom sensor client // driver. This routine is called by the framework in response to AddDevice // call from the PnP manager. It will create and initialize the device object // to represent a new instance of the sensor client. NTSTATUS CustomSensorDevice::OnDeviceAdd( _In_ WDFDRIVER /*Driver*/, // Supplies a handle to the driver object created in DriverEntry _Inout_ PWDFDEVICE_INIT pDeviceInit // Supplies a pointer to a framework-allocated WDFDEVICE_INIT structure ) { WDF_PNPPOWER_EVENT_CALLBACKS Callbacks; WDFDEVICE Device = nullptr; WDF_OBJECT_ATTRIBUTES FdoAttributes; ULONG Flag = 0; SENSOR_CONTROLLER_CONFIG SensorConfig; NTSTATUS Status = STATUS_SUCCESS; SENSOR_FunctionEnter(); WDF_OBJECT_ATTRIBUTES_INIT(&FdoAttributes); // Initialize FDO attributes and set up file object with sensor extension Status = SensorsCxDeviceInitConfig(pDeviceInit, &FdoAttributes, Flag); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! SensorsCxDeviceInitConfig failed %!STATUS!", Status); goto Exit; } // Register the PnP callbacks with the framework. WDF_PNPPOWER_EVENT_CALLBACKS_INIT(&Callbacks); Callbacks.EvtDevicePrepareHardware = CustomSensorDevice::OnPrepareHardware; Callbacks.EvtDeviceReleaseHardware = CustomSensorDevice::OnReleaseHardware; Callbacks.EvtDeviceD0Entry = CustomSensorDevice::OnD0Entry; Callbacks.EvtDeviceD0Exit = CustomSensorDevice::OnD0Exit; WdfDeviceInitSetPnpPowerEventCallbacks(pDeviceInit, &Callbacks); // Call the framework to create the device Status = WdfDeviceCreate(&pDeviceInit, &FdoAttributes, &Device); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! WdfDeviceCreate failed %!STATUS!", Status); goto Exit; } // Register CLX callback function pointers SENSOR_CONTROLLER_CONFIG_INIT(&SensorConfig); SensorConfig.DriverIsPowerPolicyOwner = WdfUseDefault; SensorConfig.EvtSensorStart = CustomSensorDevice::OnStart; SensorConfig.EvtSensorStop = CustomSensorDevice::OnStop; SensorConfig.EvtSensorGetSupportedDataFields = CustomSensorDevice::OnGetSupportedDataFields; SensorConfig.EvtSensorGetDataInterval = CustomSensorDevice::OnGetDataInterval; SensorConfig.EvtSensorSetDataInterval = CustomSensorDevice::OnSetDataInterval; SensorConfig.EvtSensorGetDataFieldProperties = CustomSensorDevice::OnGetDataFieldProperties; SensorConfig.EvtSensorGetDataThresholds = CustomSensorDevice::OnGetDataThresholds; SensorConfig.EvtSensorSetDataThresholds = CustomSensorDevice::OnSetDataThresholds; SensorConfig.EvtSensorGetProperties = CustomSensorDevice::OnGetProperties; SensorConfig.EvtSensorDeviceIoControl = CustomSensorDevice::OnIoControl; // Set up power capabilities and IO queues Status = SensorsCxDeviceInitialize(Device, &SensorConfig); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! SensorsCxDeviceInitialize failed %!STATUS!", Status); goto Exit; } Exit: SENSOR_FunctionExit(Status); return Status; } // This routine is called by the framework when the PnP manager sends an // IRP_MN_START_DEVICE request to the driver stack. This routine is // responsible for performing operations that are necessary to make the // driver's device operational (for e.g. mapping the hardware resources // into memory). NTSTATUS CustomSensorDevice::OnPrepareHardware( _In_ WDFDEVICE Device, // Supplies a handle to the framework device object _In_ WDFCMRESLIST /*ResourcesRaw*/, // Supplies a handle to a collection of framework resource // objects. This collection identifies the raw (bus-relative) hardware // resources that have been assigned to the device. _In_ WDFCMRESLIST /*ResourcesTranslated*/) // Supplies a handle to a collection of framework // resource objects. This collection identifies the translated // (system-physical) hardware resources that have been assigned to the // device. The resources appear from the CPU's point of view. { PCustomSensorDevice pDevice = nullptr; WDF_OBJECT_ATTRIBUTES SensorAttr = {}; SENSOR_CONFIG SensorConfig = {}; SENSOROBJECT SensorInstance = nullptr; NTSTATUS Status = STATUS_SUCCESS; SENSOR_FunctionEnter(); // Construct sensor instance // Create WDFOBJECT for the sensor WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&SensorAttr, CustomSensorDevice); // Register sensor instance with clx Status = SensorsCxSensorCreate(Device, &SensorAttr, &SensorInstance); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! SensorsCxSensorCreate failed %!STATUS!", Status); goto Exit; } pDevice = GetCustomSensorContextFromSensorInstance(SensorInstance); if (nullptr == pDevice) { Status = STATUS_INSUFFICIENT_RESOURCES; TraceError("CSTM %!FUNC! GetCustomSensorContextFromSensorInstance failed %!STATUS!", Status); goto Exit; } // Fill out properties Status = pDevice->Initialize(Device, SensorInstance); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! Initialize device object failed %!STATUS!", Status); goto Exit; } SENSOR_CONFIG_INIT(&SensorConfig); SensorConfig.pEnumerationList = pDevice->m_pEnumerationProperties; Status = SensorsCxSensorInitialize(SensorInstance, &SensorConfig); if (!NT_SUCCESS(Status)) { TraceError("CSTM %!FUNC! SensorsCxSensorInitialize failed %!STATUS!", Status); goto Exit; } Exit: SENSOR_FunctionExit(Status); return Status; } // This routine is called by the framework when the PnP manager is revoking // ownership of our resources. This may be in response to either // IRP_MN_STOP_DEVICE or IRP_MN_REMOVE_DEVICE. This routine is responsible for // performing cleanup of resources allocated in PrepareHardware callback. // This callback is invoked before passing the request down to the lower driver. // This routine will also be invoked by the framework if the prepare hardware // callback returns a failure. NTSTATUS CustomSensorDevice::OnReleaseHardware( _In_ WDFDEVICE Device, // Supplies a handle to the framework device object _In_ WDFCMRESLIST /*ResourcesTranslated*/) // Supplies a handle to a collection of framework // resource objects. This collection identifies the translated // (system-physical) hardware resources that have been assigned to the // device. The resources appear from the CPU's point of view. { PHardwareSimulator pSimulator = nullptr; PCustomSensorDevice pDevice = nullptr; SENSOROBJECT SensorInstance = nullptr; ULONG SensorInstanceCount = 1; // only expect 1 sensor instance NTSTATUS Status = STATUS_SUCCESS; SENSOR_FunctionEnter(); // Get sensor instance Status = SensorsCxDeviceGetSensorList(Device, &SensorInstance, &SensorInstanceCount); if (!NT_SUCCESS(Status) || 0 == SensorInstanceCount || NULL == SensorInstance) { Status = STATUS_INVALID_PARAMETER; TraceError("CSTM %!FUNC! SensorsCxDeviceGetSensorList failed %!STATUS!", Status); goto Exit; } pDevice = GetCustomSensorContextFromSensorInstance(SensorInstance); if (nullptr == pDevice) { Status = STATUS_INVALID_PARAMETER; TraceError("CSTM %!FUNC! GetCustomSensorContextFromSensorInstance failed %!STATUS!", Status); goto Exit; } // Delete lock if (pDevice->m_Lock) { WdfObjectDelete(pDevice->m_Lock); pDevice->m_Lock = NULL; } // Cleanup the CO2 simulator pSimulator = GetHardwareSimulatorContextFromInstance(pDevice->m_SimulatorInstance); if (nullptr == pSimulator) { Status = STATUS_INSUFFICIENT_RESOURCES; TraceError("CSTM %!FUNC! GetHardwareSimulatorContextFromInstance failed %!STATUS!", Status); goto Exit; } pSimulator->Cleanup(); // Delete hardware simulator instance if (NULL != pDevice->m_SimulatorInstance) { WdfObjectDelete(pDevice->m_SimulatorInstance); pDevice->m_SimulatorInstance = NULL; } // Delete sensor instance if (NULL != pDevice->m_SensorInstance) { WdfObjectDelete(pDevice->m_SensorInstance); } Exit: SENSOR_FunctionExit(Status); return Status; } // This routine is invoked by the framework to program the device to goto // D0, which is the working state. The framework invokes callback every // time the hardware needs to be (re-)initialized. This includes after // IRP_MN_START_DEVICE, IRP_MN_CANCEL_STOP_DEVICE, IRP_MN_CANCEL_REMOVE_DEVICE, // and IRP_MN_SET_POWER-D0. NTSTATUS CustomSensorDevice::OnD0Entry( _In_ WDFDEVICE Device, // Supplies a handle to the framework device object _In_ WDF_POWER_DEVICE_STATE /*PreviousState*/) // WDF_POWER_DEVICE_STATE-typed enumerator that identifies // the device power state that the device was in before this transition to D0 { PCustomSensorDevice pDevice; SENSOROBJECT SensorInstance = nullptr; ULONG SensorInstanceCount = 1; NTSTATUS Status = STATUS_SUCCESS; SENSOR_FunctionEnter(); // Get sensor instance Status = SensorsCxDeviceGetSensorList(Device, &SensorInstance, &SensorInstanceCount); if (!NT_SUCCESS(Status) || 0 == SensorInstanceCount || NULL == SensorInstance) { Status = STATUS_INVALID_PARAMETER; TraceError("CSTM %!FUNC! SensorsCxDeviceGetSensorList failed %!STATUS!", Status); goto Exit; } pDevice = GetCustomSensorContextFromSensorInstance(SensorInstance); if (nullptr == pDevice) { Status = STATUS_INVALID_PARAMETER; TraceError("CSTM %!FUNC! GetCustomSensorContextFromSensorInstance failed %!STATUS!", Status); goto Exit; } // Power on sensor pDevice->m_PoweredOn = TRUE; InitPropVariantFromUInt32(SensorState_Idle, &(pDevice->m_pProperties->List[SENSOR_PROPERTY_STATE].Value)); Exit: SENSOR_FunctionExit(Status); return Status; } // This routine is invoked by the framework to program the device to go into // a certain Dx state. The framework invokes callback every the the device is // leaving the D0 state, which happens when the device is stopped, when it is // removed, and when it is powered off. NTSTATUS CustomSensorDevice::OnD0Exit( _In_ WDFDEVICE Device, // Supplies a handle to the framework device object _In_ WDF_POWER_DEVICE_STATE /*TargetState*/) // Supplies the device power state which the device will be put // in once the callback is complete { PCustomSensorDevice pDevice; SENSOROBJECT SensorInstance = nullptr; ULONG SensorInstanceCount = 1; NTSTATUS Status = STATUS_SUCCESS; SENSOR_FunctionEnter(); // Get sensor instance Status = SensorsCxDeviceGetSensorList(Device, &SensorInstance, &SensorInstanceCount); if (!NT_SUCCESS(Status) || 0 == SensorInstanceCount || NULL == SensorInstance) { Status = STATUS_INVALID_PARAMETER; TraceError("CSTM %!FUNC! SensorsCxDeviceGetSensorList failed %!STATUS!", Status); goto Exit; } pDevice = GetCustomSensorContextFromSensorInstance(SensorInstance); if (nullptr == pDevice) { Status = STATUS_INVALID_PARAMETER; TraceError("CSTM %!FUNC! GetCustomSensorContextFromSensorInstance failed %!STATUS!", Status); goto Exit; } // Power off sensor pDevice->m_PoweredOn = FALSE; Exit: SENSOR_FunctionExit(Status); return Status; }