/******************************************************************************
* This method gets the WpdBaseDriver associated with the UMDF device object.
* The caller should Release *ppWpdBaseDriver when it is done.
*
* When this device was created, we assigned the WpdBaseDriver as the context.
* So, in order to retrieve the correct WpdBaseDriver for this device, we simply
* get the device context.
*****************************************************************************/
HRESULT CQueue::GetWpdBaseDriver(
IWDFDevice* pDevice,
WpdBaseDriver** ppWpdBaseDriver)
{
HRESULT hr = S_OK;
WpdBaseDriver* pContext = NULL;
if((pDevice == NULL) || (ppWpdBaseDriver == NULL))
{
hr = E_POINTER;
CHECK_HR(hr, "Cannot have NULL parameter for pDevice or ppWpdBaseDriver");
}
if(hr == S_OK)
{
hr = pDevice->RetrieveContext((void**)&pContext);
if(hr == S_OK)
{
if(pContext != NULL)
{
pContext->AddRef();
*ppWpdBaseDriver = pContext;
}
else
{
hr = E_UNEXPECTED;
CHECK_HR(hr, "Device context is NULL");
}
}
}
return hr;
}
/******************************************************************************
* This method gets the WpdBaseDriver associated with the UMDF device object.
* The caller should Release *ppWpdBaseDriver when it is done.
*
* When this device was created, we assigned the WpdBaseDriver as the context.
* So, in order to retrieve the correct WpdBaseDriver for this device, we simply
* get the device context.
*****************************************************************************/
HRESULT GetWpdBaseDriver(
_In_ IWDFDevice* pDevice,
_Outptr_result_nullonfailure_ WpdBaseDriver** ppWpdBaseDriver)
{
HRESULT hr = S_OK;
WpdBaseDriver* pContext = NULL;
if((pDevice == NULL) || (ppWpdBaseDriver == NULL))
{
hr = E_POINTER;
CHECK_HR(hr, "Cannot have NULL parameter for pDevice or ppWpdBaseDriver");
}
*ppWpdBaseDriver = NULL;
if(SUCCEEDED(hr))
{
hr = pDevice->RetrieveContext((void**)&pContext);
if(SUCCEEDED(hr))
{
if(pContext != NULL)
{
pContext->AddRef();
*ppWpdBaseDriver = pContext;
}
else
{
hr = E_UNEXPECTED;
CHECK_HR(hr, "Device context is NULL");
}
}
}
return hr;
}
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
--*/
{
HRESULT hr = S_OK;
CComPtr<IUnknown> pDeviceCallback;
if (hr == S_OK)
{
WpdBaseDriver *pWpdBaseDriver = NULL;
//
// Create the WPD driver object that handles all WPD messages for this device
//
pWpdBaseDriver = new WpdBaseDriver();
if(pWpdBaseDriver == NULL)
{
hr = E_OUTOFMEMORY;
}
if(SUCCEEDED(hr))
{
//
// Create device callback object
//
hr = CDevice::CreateInstance(pDeviceInit, pWpdBaseDriver, &pDeviceCallback);
}
//
// This driver has no special power management requirements and so
// we set power policy ownership to UMDF to indicate that UMDF should
// handle powermanagement for us.
//
pDeviceInit->SetPowerPolicyOwnership(FALSE);
//
// Create WDFDevice.
//
CComPtr<IWDFDevice> pIWDFDevice;
if(SUCCEEDED(hr))
{
hr = pDriver->CreateDevice(
pDeviceInit,
pDeviceCallback,
&pIWDFDevice);
}
//
// Assign pWpdBaseDriver to the device object. Each UMDF device requires its own instance of
// a WpdBaseDriver to handle WPD messages.
//
if(SUCCEEDED(hr))
{
hr = pIWDFDevice->AssignContext(this, (void*)pWpdBaseDriver);
if(SUCCEEDED(hr))
{
// AddRef the WpdBaseDriver object since it is not stored with the
// device context.
pWpdBaseDriver->AddRef();
}
}
//
// Create queue callback object
//
CComPtr<IUnknown> pIUnknown;
if(S_OK == hr)
{
hr = CQueue::CreateInstance(&pIUnknown);
}
//
// Configure the default queue.
//
if(S_OK == hr)
{
CComPtr<IWDFIoQueue> pDefaultQueue;
hr = pIWDFDevice->CreateIoQueue(
pIUnknown,
TRUE, // bDefaultQueue
WdfIoQueueDispatchSequential,
TRUE, // bPowerManaged
FALSE, // bAllowZeroLengthRequests
&pDefaultQueue);
}
pDeviceCallback = NULL;
pIWDFDevice = NULL;
//
// It is fine to release the interface on the callback object.
// The framework has its own refcount on this object and will
// provide an interface when calling into the driver.
//
pIUnknown = NULL;
// Release the WpdBaseDriver object. If it was successfully added to the device context,
// it was already addref'd above. Releasing it here ensures it will be destroyed if
// an error occured and it could not be added to the device context.
SAFE_RELEASE(pWpdBaseDriver);
}
return hr;
}