reactos/drivers/wdm/audio/backpln/portcls/power.cpp

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS Kernel Streaming
   4  * FILE:            drivers/wdm/audio/backpln/portcls/power.cpp
   5  * PURPOSE:         Power support functions
   6  * PROGRAMMER:      Johannes Anderwald
   7  */
   8
   9 #include "private.hpp"
  10
  11 NTSTATUS
  12 NTAPI
  13 PcRegisterAdapterPowerManagement(
  14     IN  PUNKNOWN pUnknown,
  15     IN  PVOID pvContext)
  16 {
  17     NTSTATUS Status;
  18     PDEVICE_OBJECT pDeviceObject;
  19     PPCLASS_DEVICE_EXTENSION DeviceExt;
  20     IAdapterPowerManagement * pPower;
  21
  22     DPRINT("PcRegisterAdapterPowerManagement pUnknown %p pvContext %p\n", pUnknown, pvContext);
  23     PC_ASSERT_IRQL_EQUAL(PASSIVE_LEVEL);
  24
  25     if (!pUnknown || !pvContext)
  26         return STATUS_INVALID_PARAMETER;
  27
  28
  29     pDeviceObject = (PDEVICE_OBJECT)pvContext;
  30     DeviceExt = (PPCLASS_DEVICE_EXTENSION)pDeviceObject->DeviceExtension;
  31
  32     Status = pUnknown->QueryInterface(IID_IAdapterPowerManagement, (PVOID*)&pPower);
  33     if (!NT_SUCCESS(Status))
  34     {
  35         DPRINT1("PcRegisterAdapterPowerManagement no IAdapterPowerManagement interface %x\n", Status);
  36         DeviceExt->AdapterPowerManagement = NULL;
  37         return STATUS_SUCCESS;
  38     }
  39
  40     DeviceExt->AdapterPowerManagement = pPower;
  41     DPRINT("PcRegisterAdapterPowerManagement success %x\n", Status);
  42     return STATUS_SUCCESS;
  43 }
  44
  45
  46 static
  47 VOID
  48 NTAPI
  49 PwrCompletionCallback(
  50     IN PDEVICE_OBJECT DeviceObject,
  51     IN UCHAR MinorFunction,
  52     IN POWER_STATE PowerState,
  53     IN PVOID Context,
  54     IN PIO_STATUS_BLOCK IoStatus)
  55 {
  56     KeSetEvent((PRKEVENT)Context, IO_NO_INCREMENT, FALSE);
  57 }
  58
  59 NTSTATUS
  60 NTAPI
  61 PcRequestNewPowerState(
  62     IN  PDEVICE_OBJECT DeviceObject,
  63     IN  DEVICE_POWER_STATE RequestedNewState)
  64 {
  65     KEVENT Event;
  66     NTSTATUS Status;
  67     POWER_STATE PowerState;
  68     PPCLASS_DEVICE_EXTENSION DeviceExt;
  69
  70     PC_ASSERT_IRQL_EQUAL(PASSIVE_LEVEL);
  71
  72     if (!DeviceObject || !RequestedNewState)
  73         return STATUS_INVALID_PARAMETER;
  74
  75     DeviceExt = (PPCLASS_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
  76     KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
  77
  78     PowerState.DeviceState = RequestedNewState;
  79     PowerState.SystemState = PowerSystemUnspecified;
  80
  81     Status = PoRequestPowerIrp(DeviceExt->PhysicalDeviceObject, IRP_MN_SET_POWER, PowerState, PwrCompletionCallback, (PVOID)&Event, NULL);
  82     if (NT_SUCCESS(Status))
  83     {
  84         KeWaitForSingleObject((PVOID)&Event, Executive, KernelMode, FALSE, NULL);
  85     }
  86
  87
  88     return Status;
  89 }
  90