Sample Code

Windows Driver Samples/ Toaster Sample Driver/ C++/ umdf/ func/ Driver.cpp/

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/*++
 
  Copyright (c) Microsoft Corporation, All Rights Reserved
 
  Module Name:
 
    Driver.cpp
 
  Abstract:
 
    This file contains the implementation for the driver object.
 
  Environment:
 
    Windows User-Mode Driver Framework (WUDF)
 
--*/
 
#include "stdafx.h"
#include "Driver.h"
#include "Device.h"
#include "Queue.h"
 
#include "internal.h"
#include "driver.tmh"
 
//Idle setting for the Toaster device
#define IDLEWAKE_TIMEOUT_MSEC 6000
 
 
HRESULT
CDriver::OnDeviceAdd(
     _In_ IWDFDriver* pDriver,
     _In_ IWDFDeviceInitialize* pDeviceInit
    )
/*++
 
Routine Description:
 
    The framework calls this function when a device is being added to
    the driver stack.
 
Arguments:
 
    IWDFDriver           - Framework interface.  The driver uses this
                           interface to create device objects.
    IWDFDeviceInitialize - Framework interface.  The driver uses this
                           interface to set device parameters before
                           creating the device obeject.
 
Return Value:
 
   HRESULT S_OK - Device added successfully
 
--*/
{
    IUnknown    *pDeviceCallback  = NULL;
    IWDFDevice  *pIWDFDevice      = NULL;
    IWDFDevice2 *pIWDFDevice2     = NULL;
    IUnknown    *pIUnkQueue       = NULL;   
     
    //
    // UMDF Toaster is a function driver so set is as the power policy owner (PPO)
    //
       pDeviceInit->SetPowerPolicyOwnership(TRUE);    
 
    //
    // Create our device callback object.
    //
    HRESULT hr = CDevice::CreateInstance(&pDeviceCallback);
     
    //
    // Ask the framework to create a device object for us.
    // We pass in the callback object and device init object
    // as creation parameters.
    //
    if (SUCCEEDED(hr))
    {
        hr = pDriver->CreateDevice(pDeviceInit,
                                   pDeviceCallback,
                                   &pIWDFDevice);
    }
 
    //
    // Create the queue callback object.
    //
 
    if (SUCCEEDED(hr))
    {
        hr = CQueue::CreateInstance(&pIUnkQueue);
    }
 
    //
    // Configure the default queue.  We pass in our queue callback
    // object to inform the framework about the callbacks we want.
    //
 
    if (SUCCEEDED(hr))
    {
        IWDFIoQueue * pDefaultQueue = NULL;
        hr = pIWDFDevice->CreateIoQueue(
                          pIUnkQueue,
                          TRUE,                        // bDefaultQueue
                          WdfIoQueueDispatchParallel,
                          TRUE,                        // bPowerManaged
                          FALSE,                       // bAllowZeroLengthRequests
                          &pDefaultQueue);
        SAFE_RELEASE(pDefaultQueue);
    }
 
    //
    // Enable the device interface.
    //
 
    if (SUCCEEDED(hr))
    {
        hr = pIWDFDevice->CreateDeviceInterface(&GUID_DEVINTERFACE_TOASTER,
                                                NULL);
    }
              
    //
    // IWDFDevice2 interface is an extension of IWDFDevice interface that enables
    // Idle and Wake support.
    //
 
    //
    // Get a pointer to IWDFDevice2 interface
    //
     
    if (SUCCEEDED(hr))
    {
        hr = pIWDFDevice->QueryInterface(__uuidof(IWDFDevice2), (void**) &pIWDFDevice2); 
    }   
 
    //
    // Since this is a virtual device we tell the framework that we cannot wake
    // ourself if we sleep in S0. Only way the device can be brought to D0 is if
    // the device recieves an I/O from the system.
    //
 
    if (SUCCEEDED(hr))
    {
      
       hr = pIWDFDevice2->AssignS0IdleSettings(
                            IdleCannotWakeFromS0,  
                            PowerDeviceD3,          //the lowest-powered device sleeping state
                            IDLEWAKE_TIMEOUT_MSEC,  //idle timeout
                            IdleAllowUserControl,   //user can control the device's idle behavior.
                            WdfTrue);      
       
    }
 
    //
    // TODO: Add the Idle and Wake suupport specific for your hardware
    //
 
    SAFE_RELEASE(pDeviceCallback);
    SAFE_RELEASE(pIWDFDevice);
    SAFE_RELEASE(pIWDFDevice2);
    SAFE_RELEASE(pIUnkQueue);   
 
    return hr;
}
 
VOID
CDriver::OnDeinitialize(
     _In_ IWDFDriver * /* pDriver */
     )
/*++
 
Routine Description:
 
    The framework calls this function just before de-initializing itself. All
    WDF framework resources should be released by driver before returning from this call.
 
Arguments:
 
Return Value:
 
--*/
{
    return ;
}
 
HRESULT
CDriver::OnInitialize(
     _In_ IWDFDriver * /* pDriver */
     )
/*++
 
Routine Description:
 
    The framework calls this function just after loading the driver. The driver can
    perform any global, device independent intialization in this routine.
 
Arguments:
 
Return Value:
 
--*/
{
    return S_OK;
}

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