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/*++
Copyright (c) Microsoft Corporation, All Rights Reserved
Module Name:
ControlQueue.cpp
Abstract:
This file implements the I/O queue interface and performs
the ioctl operations.
Environment:
Windows User-Mode Driver Framework (WUDF)
--*/
#include "internal.h"
#include "winioctl.h"
#include "ControlQueue.tmh"
CMyControlQueue::CMyControlQueue(
_In_ PCMyDevice Device
) : CMyQueue(Device)
{
}
HRESULT
STDMETHODCALLTYPE
CMyControlQueue::QueryInterface(
_In_ REFIID InterfaceId,
_Out_ PVOID *Object
)
/*++
Routine Description:
Query Interface
Aruments:
Follows COM specifications
Return Value:
HRESULT indicatin success or failure
--*/
{
HRESULT hr;
if (IsEqualIID(InterfaceId, __uuidof(IQueueCallbackDeviceIoControl)))
{
hr = S_OK;
*Object = QueryIQueueCallbackDeviceIoControl();
}
else
{
hr = CMyQueue::QueryInterface(InterfaceId, Object);
}
return hr;
}
//
// Initialize
//
HRESULT
CMyControlQueue::CreateInstance(
_In_ PCMyDevice Device,
_Out_ PCMyControlQueue *Queue
)
/*++
Routine Description:
CreateInstance creates an instance of the queue object.
Aruments:
ppUkwn - OUT parameter is an IUnknown interface to the queue object
Return Value:
HRESULT indicatin success or failure
--*/
{
PCMyControlQueue queue = NULL;
HRESULT hr = S_OK;
queue = new CMyControlQueue(Device);
if (NULL == queue)
{
hr = E_OUTOFMEMORY;
}
//
// Call the queue callback object to initialize itself. This will create
// its partner queue framework object.
//
if (SUCCEEDED(hr))
{
hr = queue->Initialize();
}
if (SUCCEEDED(hr))
{
*Queue = queue;
}
else
{
SAFE_RELEASE(queue);
}
return hr;
}
HRESULT
CMyControlQueue::Initialize(
VOID
)
{
HRESULT hr;
//
// First initialize the base class. This will create the partner FxIoQueue
// object and setup automatic forwarding of I/O controls.
//
hr = __super::Initialize(WdfIoQueueDispatchSequential,
false,
true);
//
// return the status.
//
return hr;
}
VOID
STDMETHODCALLTYPE
CMyControlQueue::OnDeviceIoControl(
_In_ IWDFIoQueue *FxQueue,
_In_ IWDFIoRequest *FxRequest,
_In_ ULONG ControlCode,
_In_ SIZE_T InputBufferSizeInBytes,
_In_ SIZE_T OutputBufferSizeInBytes
)
/*++
Routine Description:
DeviceIoControl dispatch routine
Aruments:
FxQueue - Framework Queue instance
FxRequest - Framework Request instance
ControlCode - IO Control Code
InputBufferSizeInBytes - Lenth of input buffer
OutputBufferSizeInBytes - Lenth of output buffer
Always succeeds DeviceIoIoctl
Return Value:
VOID
--*/
{
UNREFERENCED_PARAMETER(FxQueue);
UNREFERENCED_PARAMETER(OutputBufferSizeInBytes);
IWDFMemory *memory = NULL;
PVOID buffer;
SIZE_T bigBufferCb;
ULONG information = 0;
bool completeRequest = true;
HRESULT hr = S_OK;
switch (ControlCode)
{
case IOCTL_OSRUSBFX2_SET_BAR_GRAPH_DISPLAY:
{
//
// Make sure the buffer is big enough to hold the input for the
// control transfer.
//
if (InputBufferSizeInBytes < sizeof(BAR_GRAPH_STATE))
{
hr = HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
}
else
{
FxRequest->GetInputMemory(&memory);
}
//
// Get the data buffer and use it to set the bar graph on the
// device.
//
if (SUCCEEDED(hr))
{
buffer = memory->GetDataBuffer(&bigBufferCb);
memory->Release();
hr = m_Device->SetBarGraphDisplay((PBAR_GRAPH_STATE) buffer);
}
break;
}
default:
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
break;
}
}
if (completeRequest)
{
FxRequest->CompleteWithInformation(hr, information);
}
return;
}
|
