VOID
STDMETHODCALLTYPE
CSimdeviceQueue::OnWrite(
_In_ IWDFIoQueue *pWdfQueue,
_In_ IWDFIoRequest *pWdfRequest,
_In_ SIZE_T BytesToWrite
)
/*++
Routine Description:
Write dispatch routine
IQueueCallbackWrite
Arguments:
pWdfQueue - Framework Queue instance
pWdfRequest - Framework Request instance
BytesToWrite - Length of bytes in the write buffer
Allocate and copy data to local buffer
Return Value:
VOID
--*/
{
HRESULT hr;
IWDFMemory* pRequestMemory = NULL;
IWDFIoRequest2 * pWdfRequest2 = NULL;
UNREFERENCED_PARAMETER(pWdfQueue);
//
// Handle Zero length writes.
//
if (!BytesToWrite) {
pWdfRequest->CompleteWithInformation(S_OK, 0);
return;
}
if( BytesToWrite > MAX_WRITE_LENGTH ) {
pWdfRequest->CompleteWithInformation(HRESULT_FROM_WIN32(ERROR_MORE_DATA), 0);
return;
}
// Get memory object
hr = pWdfRequest->QueryInterface(IID_PPV_ARGS(&pWdfRequest2));
if (FAILED(hr)) {
pWdfRequest->Complete(hr);
return;
}
// Release previous buffer if set
if( m_Buffer != NULL ) {
delete [] m_Buffer;
m_Buffer = NULL;
m_Length = 0L;
}
// Allocate Buffer
m_Buffer = new UCHAR[BytesToWrite];
if (m_Buffer == NULL) {
pWdfRequest->Complete(E_OUTOFMEMORY);
m_Length = 0L;
return;
}
hr = pWdfRequest2->RetrieveInputMemory(&pRequestMemory);
if (FAILED(hr)) {
goto Exit;
}
// Copy from memory object to our buffer
hr = pRequestMemory->CopyToBuffer(0, m_Buffer, BytesToWrite);
if (FAILED(hr)) {
goto Exit;
}
//
// Save the information so that we can use it
// to complete the request later.
//
Lock();
m_Length = (ULONG) BytesToWrite;
m_XferredBytes = m_Length;
m_CurrentRequest = pWdfRequest2;
pWdfRequest2 = NULL;
Unlock();
Exit:
if (FAILED(hr)) {
pWdfRequest2->CompleteWithInformation(hr, 0);
delete [] m_Buffer;
m_Buffer = NULL;
}
SAFE_RELEASE(pRequestMemory);
SAFE_RELEASE(pWdfRequest2);
return;
}
VOID
STDMETHODCALLTYPE
CMyQueue::OnDeviceIoControl(
_In_ IWDFIoQueue *pWdfQueue,
_In_ IWDFIoRequest *pWdfRequest,
_In_ ULONG ControlCode,
_In_ SIZE_T InputBufferSizeInBytes,
_In_ SIZE_T OutputBufferSizeInBytes
)
/*++
Routine Description:
DeviceIoControl dispatch routine
Arguments:
pWdfQueue - Framework Queue instance
pWdfRequest - Framework Request instance
ControlCode - IO Control Code
InputBufferSizeInBytes - Length of input buffer
OutputBufferSizeInBytes - Length of output buffer
Always succeeds DeviceIoIoctl
Return Value:
VOID
--*/
{
UNREFERENCED_PARAMETER(OutputBufferSizeInBytes);
UNREFERENCED_PARAMETER(InputBufferSizeInBytes);
UNREFERENCED_PARAMETER(pWdfQueue);
HRESULT hr = S_OK;
SIZE_T reqCompletionInfo = 0;
IWDFMemory *inputMemory = NULL;
IWDFMemory *outputMemory = NULL;
UINT i;
WUDF_TEST_DRIVER_ASSERT(pWdfRequest);
WUDF_TEST_DRIVER_ASSERT(m_Device);
switch (ControlCode)
{
case IOCTL_SERIAL_SET_BAUD_RATE:
{
//
// This is a driver for a virtual serial port. Since there is no
// actual hardware, we just store the baud rate and don't do
// anything with it.
//
SERIAL_BAUD_RATE baudRateBuffer = {0};
pWdfRequest->GetInputMemory(&inputMemory);
if (NULL == inputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
hr = inputMemory->CopyToBuffer(0,
(void*) &baudRateBuffer,
sizeof(SERIAL_BAUD_RATE));
}
if (SUCCEEDED(hr))
{
m_Device->SetBaudRate(baudRateBuffer.BaudRate);
}
break;
}
case IOCTL_SERIAL_GET_BAUD_RATE:
{
SERIAL_BAUD_RATE baudRateBuffer = {0};
baudRateBuffer.BaudRate = m_Device->GetBaudRate();
pWdfRequest->GetOutputMemory(&outputMemory);
if (NULL == outputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
hr = outputMemory->CopyFromBuffer(0,
(void*) &baudRateBuffer,
sizeof(SERIAL_BAUD_RATE));
}
if (SUCCEEDED(hr))
{
reqCompletionInfo = sizeof(SERIAL_BAUD_RATE);
}
break;
}
case IOCTL_SERIAL_SET_MODEM_CONTROL:
{
//
// This is a driver for a virtual serial port. Since there is no
// actual hardware, we just store the modem control register
// configuration and don't do anything with it.
//
ULONG *pModemControlRegister = NULL;
pWdfRequest->GetInputMemory(&inputMemory);
if (NULL == inputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
pModemControlRegister = m_Device->GetModemControlRegisterPtr();
WUDF_TEST_DRIVER_ASSERT(pModemControlRegister);
hr = inputMemory->CopyToBuffer(0,
(void*) pModemControlRegister,
sizeof(ULONG));
}
break;
}
case IOCTL_SERIAL_GET_MODEM_CONTROL:
{
ULONG *pModemControlRegister = NULL;
pWdfRequest->GetOutputMemory(&outputMemory);
if (NULL == outputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
pModemControlRegister = m_Device->GetModemControlRegisterPtr();
WUDF_TEST_DRIVER_ASSERT(pModemControlRegister);
hr = outputMemory->CopyFromBuffer(0,
(void*) pModemControlRegister,
sizeof(ULONG));
}
if (SUCCEEDED(hr))
{
reqCompletionInfo = sizeof(ULONG);
}
break;
}
case IOCTL_SERIAL_SET_FIFO_CONTROL:
{
//
// This is a driver for a virtual serial port. Since there is no
// actual hardware, we just store the FIFO control register
// configuration and don't do anything with it.
//
ULONG *pFifoControlRegister = NULL;
pWdfRequest->GetInputMemory(&inputMemory);
if (NULL == inputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
pFifoControlRegister = m_Device->GetFifoControlRegisterPtr();
hr = inputMemory->CopyToBuffer(0,
(void*) pFifoControlRegister,
sizeof(ULONG));
}
break;
}
case IOCTL_SERIAL_GET_LINE_CONTROL:
{
ULONG *pLineControlRegister = NULL;
SERIAL_LINE_CONTROL lineControl = {0};
ULONG lineControlSnapshot;
pLineControlRegister = m_Device->GetLineControlRegisterPtr();
WUDF_TEST_DRIVER_ASSERT(pLineControlRegister);
//
// Take a snapshot of the line control register variable
//
lineControlSnapshot = *pLineControlRegister;
//
// Decode the word length
//
if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_5_DATA)
{
lineControl.WordLength = 5;
}
else if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_6_DATA)
{
lineControl.WordLength = 6;
}
else if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_7_DATA)
{
lineControl.WordLength = 7;
}
else if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_8_DATA)
{
lineControl.WordLength = 8;
}
//
// Decode the parity
//
if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_NONE_PARITY)
{
lineControl.Parity = NO_PARITY;
}
else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_ODD_PARITY)
{
lineControl.Parity = ODD_PARITY;
}
else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_EVEN_PARITY)
{
lineControl.Parity = EVEN_PARITY;
}
else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_MARK_PARITY)
{
lineControl.Parity = MARK_PARITY;
}
else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_SPACE_PARITY)
{
lineControl.Parity = SPACE_PARITY;
}
//
// Decode the length of the stop bit
//
if (lineControlSnapshot & SERIAL_2_STOP)
{
if (lineControl.WordLength == 5)
{
lineControl.StopBits = STOP_BITS_1_5;
}
else
{
lineControl.StopBits = STOP_BITS_2;
}
}
else
{
lineControl.StopBits = STOP_BIT_1;
}
//
// Copy the information that was decoded to the caller's buffer
//
pWdfRequest->GetOutputMemory(&outputMemory);
if (NULL == outputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
hr = outputMemory->CopyFromBuffer(0,
(void*) &lineControl,
sizeof(SERIAL_LINE_CONTROL));
}
if (SUCCEEDED(hr))
{
reqCompletionInfo = sizeof(SERIAL_LINE_CONTROL);
}
break;
}
case IOCTL_SERIAL_SET_LINE_CONTROL:
{
ULONG *pLineControlRegister = NULL;
SERIAL_LINE_CONTROL lineControl = {0};
UCHAR lineControlData = 0;
UCHAR lineControlStop = 0;
UCHAR lineControlParity = 0;
ULONG lineControlSnapshot;
ULONG lineControlNew;
ULONG lineControlPrevious;
pLineControlRegister = m_Device->GetLineControlRegisterPtr();
WUDF_TEST_DRIVER_ASSERT(pLineControlRegister);
//
// This is a driver for a virtual serial port. Since there is no
// actual hardware, we just store the line control register
// configuration and don't do anything with it.
//
pWdfRequest->GetInputMemory(&inputMemory);
if (NULL == inputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
hr = inputMemory->CopyToBuffer(0,
(void*) &lineControl,
sizeof(SERIAL_LINE_CONTROL));
}
//
// Bits 0 and 1 of the line control register
//
if (SUCCEEDED(hr))
{
switch (lineControl.WordLength)
{
case 5:
lineControlData = SERIAL_5_DATA;
m_Device->SetValidDataMask(0x1f);
break;
case 6:
lineControlData = SERIAL_6_DATA;
m_Device->SetValidDataMask(0x3f);
break;
case 7:
lineControlData = SERIAL_7_DATA;
m_Device->SetValidDataMask(0x7f);
break;
case 8:
lineControlData = SERIAL_8_DATA;
m_Device->SetValidDataMask(0xff);
break;
default:
hr = E_INVALIDARG;
}
}
//
// Bit 2 of the line control register
//
if (SUCCEEDED(hr))
{
switch (lineControl.StopBits)
{
case STOP_BIT_1:
lineControlStop = SERIAL_1_STOP;
break;
case STOP_BITS_1_5:
if (lineControlData != SERIAL_5_DATA)
{
hr = E_INVALIDARG;
break;
}
lineControlStop = SERIAL_1_5_STOP;
break;
case STOP_BITS_2:
if (lineControlData == SERIAL_5_DATA)
{
hr = E_INVALIDARG;
break;
}
lineControlStop = SERIAL_2_STOP;
break;
default:
hr = E_INVALIDARG;
}
}
//
// Bits 3, 4 and 5 of the line control register
//
if (SUCCEEDED(hr))
{
switch (lineControl.Parity)
{
case NO_PARITY:
lineControlParity = SERIAL_NONE_PARITY;
break;
case EVEN_PARITY:
lineControlParity = SERIAL_EVEN_PARITY;
break;
case ODD_PARITY:
lineControlParity = SERIAL_ODD_PARITY;
break;
case SPACE_PARITY:
lineControlParity = SERIAL_SPACE_PARITY;
break;
case MARK_PARITY:
lineControlParity = SERIAL_MARK_PARITY;
break;
default:
hr = E_INVALIDARG;
}
}
//
// Update our line control register variable atomically
//
i=0;
do
{
i++;
if ((i & 0xf) == 0)
{
//
// We've been spinning in a loop for a while trying to
// update the line control register variable atomically.
// Yield the CPU for other threads for a while.
//
SwitchToThread();
}
lineControlSnapshot = *pLineControlRegister;
lineControlNew = (lineControlSnapshot & SERIAL_LCR_BREAK) |
(lineControlData |
lineControlParity |
lineControlStop);
lineControlPrevious = InterlockedCompareExchange((LONG *) pLineControlRegister,
lineControlNew,
lineControlSnapshot);
} while (lineControlPrevious != lineControlSnapshot);
break;
}
case IOCTL_SERIAL_GET_TIMEOUTS:
{
SERIAL_TIMEOUTS timeoutValues = {0};
pWdfRequest->GetOutputMemory(&outputMemory);
if (NULL == outputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
m_Device->GetTimeouts(&timeoutValues);
hr = outputMemory->CopyFromBuffer(0,
(void*) &timeoutValues,
sizeof(timeoutValues));
}
if (SUCCEEDED(hr))
{
reqCompletionInfo = sizeof(SERIAL_TIMEOUTS);
}
break;
}
case IOCTL_SERIAL_SET_TIMEOUTS:
{
SERIAL_TIMEOUTS timeoutValues = {0};
pWdfRequest->GetInputMemory(&inputMemory);
if (NULL == inputMemory)
{
hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
}
if (SUCCEEDED(hr))
{
hr = inputMemory->CopyToBuffer(0,
(void*) &timeoutValues,
sizeof(timeoutValues));
}
if (SUCCEEDED(hr))
{
if ((timeoutValues.ReadIntervalTimeout == MAXULONG) &&
(timeoutValues.ReadTotalTimeoutMultiplier == MAXULONG) &&
(timeoutValues.ReadTotalTimeoutConstant == MAXULONG))
{
hr = E_INVALIDARG;
}
}
if (SUCCEEDED(hr))
{
m_Device->SetTimeouts(timeoutValues);
}
break;
}
case IOCTL_SERIAL_SET_QUEUE_SIZE:
case IOCTL_SERIAL_SET_DTR:
case IOCTL_SERIAL_SET_WAIT_MASK:
case IOCTL_SERIAL_SET_RTS:
case IOCTL_SERIAL_CLR_RTS:
case IOCTL_SERIAL_SET_XON:
case IOCTL_SERIAL_SET_XOFF:
case IOCTL_SERIAL_SET_CHARS:
case IOCTL_SERIAL_GET_CHARS:
case IOCTL_SERIAL_GET_HANDFLOW:
case IOCTL_SERIAL_SET_HANDFLOW:
case IOCTL_SERIAL_RESET_DEVICE:
{
//
// NOTE: The application expects STATUS_SUCCESS for these IOCTLs.
// so don't merge this with default.
//
break;
}
default:
{
hr = E_INVALIDARG;
}
}
//
// clean up
//
if (inputMemory)
{
inputMemory->Release();
}
if (outputMemory)
{
outputMemory->Release();
}
//
// complete the request
//
pWdfRequest->CompleteWithInformation(hr, reqCompletionInfo);
return;
}
