cspi_io.cpp

Microsoft WinCE 6.0 BSP FINAL release source code for use with the i.MX27ADS TO2 WCE600_FINAL_MX27_S

//          [in] Handle to the device context.
//
// Returns:
//      None.
//
//------------------------------------------------------------------------------
void SPI_PowerUp(void)
{
}

//------------------------------------------------------------------------------
//
// Function: SPI_Read
//
// This function reads data from the device identified by the open context.
//
// Parameters:
//      hOpenContext
//          [in] Handle to the open context of the device. The XXX_Open
//          function creates and returns this identifier.
//      pBuffer
//      	[out] Pointer to the buffer that stores the data read from the
//          device. This buffer should be at least Count bytes long.
//      Count
//          [in] Number of bytes to read from the device into pBuffer.
//
// Returns:
//      Returns zero to indicate end-of-file. Returns -1 to indicate an
//      error. Returns the number of bytes read to indicate success.
//
//------------------------------------------------------------------------------
DWORD SPI_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count)
{
    return 0;
}

//------------------------------------------------------------------------------
//
// Function: SPI_Write
//
// This function writes data to the device.
//
// Parameters:
//      hOpenContext
//          [in] Handle to the open context of the device. The XXX_Open
//          function creates and returns this identifier.
//      pBuffer
//      	[out] Pointer to the buffer that contains the data to write.
//      Count
//          [in] Number of bytes to read from the device into pBuffer.
//
// Returns:
//      The number of bytes written indicates success. A value of -1 indicates
//      failure.
//
//------------------------------------------------------------------------------
DWORD SPI_Write(DWORD Handle, LPCVOID pBuffer, DWORD dwNumBytes)
{
    return 0;
}

//------------------------------------------------------------------------------
//
// Function: SPI_Seek
//
// This function moves the data pointer in the device.
//
// Parameters:
//      hOpenContext
//       	[in] Handle to the open context of the device. The XXX_Open
//          function creates and returns this identifier.
//      Amount
//         	[in] Number of bytes to move the data pointer in the device.
//          A positive value moves the data pointer toward the end of the
//          file, and a negative value moves it toward the beginning.
//      Type
//       	[in] Starting point for the data pointer.
//
// Returns:
//      The new data pointer for the device indicates success. A value of -1
//      indicates failure.
//
//------------------------------------------------------------------------------
DWORD SPI_Seek(DWORD hOpenContext, long Amount, WORD Type)
{
    return -1;
}

//------------------------------------------------------------------------------
//
// Function: SPI_IOControl
//
// This function sends a command to a device.
//
// Parameters:
//      hOpenContext
//          [in] Handle to the open context of the device. The XXX_Open
//          function creates and returns this identifier.
//      dwCode
//          [in] I/O control operation to perform. These codes are
//          device-specific and are usually exposed to developers through
//          a header file.
//      pBufIn
//          [in] Pointer to the buffer containing data to transfer to the
//          device.
//      dwLenIn
//         [in] Number of bytes of data in the buffer specified for pBufIn.
//      pBufOut
//          [out] Pointer to the buffer used to transfer the output data
//          from the device.
//      dwLenOut
//          [in] Maximum number of bytes in the buffer specified by pBufOut.
//      pdwActualOut
//        	[out] Pointer to the DWORD buffer that this function uses to
//          return the actual number of bytes received from the device.
//
// Returns:
//      The new data pointer for the device indicates success. A value of -1
//      indicates failure.
//
//------------------------------------------------------------------------------
BOOL SPI_IOControl(DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn,
    DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut)
{
    BOOL bRet = FALSE;
    cspiClass * pCspi=(cspiClass *)hOpenContext;

    DEBUGMSG(ZONE_IOCTL | ZONE_FUNCTION, (TEXT("SPI_IOControl: hOpenContext=0x%x\r\n"),
        hOpenContext));

    if (pCspi) {
        switch (dwCode) {
            case CSPI_IOCTL_EXCHANGE:
                // Enqueue the exchange packet
                bRet = pCspi->CspiEnqueue(*((PCSPI_XCH_PKT_T *)pBufIn));
                DEBUGMSG(!bRet, (TEXT("SPI_IOControl: CSPI_IOCTL_EXCHANGE failed\r\n")));
                break;
                
            case IOCTL_POWER_CAPABILITIES:
                // Tell the power manager about ourselves.
                if (pBufOut != NULL && dwLenOut >= sizeof(POWER_CAPABILITIES) 
                    && pdwActualOut != NULL) {
                    __try {
                        PPOWER_CAPABILITIES ppc = (PPOWER_CAPABILITIES)pBufOut;
                        memset(ppc, 0, sizeof(POWER_CAPABILITIES));              
                        ppc->DeviceDx = DX_MASK(D0) | DX_MASK(D4);
                        *pdwActualOut = sizeof(POWER_CAPABILITIES);
                        bRet = TRUE;
                    } __except(EXCEPTION_EXECUTE_HANDLER) {
                        ERRORMSG(1, (_T("Exception in CSPI IOCTL_POWER_CAPABILITIES\r\n")));
                    }
                }
                break;

            case IOCTL_POWER_SET: 
                if(pBufOut != NULL && dwLenOut == sizeof(CEDEVICE_POWER_STATE) 
                    && pdwActualOut != NULL) {
                    __try {
                        CEDEVICE_POWER_STATE dx = *(PCEDEVICE_POWER_STATE)pBufOut;
                        if (VALID_DX(dx)) {
                            // Any request that is not D0 becomes a D4 request
                            if (dx != D0)
                                dx = D4;

                            *(PCEDEVICE_POWER_STATE)pBufOut = dx;
                            *pdwActualOut = sizeof(CEDEVICE_POWER_STATE);
                           
                            if (dx = D4)    // If we are turning off
                                pCspi->m_bUsePolling = TRUE;
                            else            // Else we are powering on
                                pCspi->m_bUsePolling = FALSE;

                            // Change the current power state
                            g_dxCurrent = dx; 

                            bRet = TRUE;
                        }
                    } __except(EXCEPTION_EXECUTE_HANDLER) {
                        ERRORMSG(1, (_T("Exception in CSPI IOCTL_POWER_CAPABILITIES\r\n")));
                    }
                }
                break;
        
            case IOCTL_POWER_GET: 
                if(pBufOut != NULL && dwLenOut == sizeof(CEDEVICE_POWER_STATE) 
                    && pdwActualOut != NULL) {
                    // Just return our current Dx value
                    __try {
                        *(PCEDEVICE_POWER_STATE)pBufOut = g_dxCurrent;
                        *pdwActualOut = sizeof(CEDEVICE_POWER_STATE);
                        bRet = TRUE;
                    } __except(EXCEPTION_EXECUTE_HANDLER) {
                        ERRORMSG(1, (_T("Exception in CSPI IOCTL_POWER_CAPABILITIES\r\n")));
                    }
                }
                break;

            default:
                break;
        }
    }

    DEBUGMSG(ZONE_IOCTL | ZONE_FUNCTION, (TEXT("SPI_IOControl -\r\n")));
    return bRet;
}

//------------------------------------------------------------------------------
//
// Function: CSPI_DllEntry
//
// This is the entry and exit point for the CSPI module. This function is 
// called when processed and threads attach and detach from this module.
//
// Parameters:
//      hInstDll
//          [in] The handle to this module.
//      dwReason
//			[in] Specifies a flag indicating why the DLL entry-point function
//          is being called.
//      lpvReserved
//          [in] Specifies further aspects of DLL initialization and cleanup.
//
// Returns:
//      TRUE if the everything is OK; FALSE if an error occurred.
//
//------------------------------------------------------------------------------
BOOL WINAPI CSPI_DllEntry(HANDLE hInstDll, DWORD dwReason, LPVOID lpvReserved)
{
    switch (dwReason) {
        case DLL_PROCESS_ATTACH:
            DEBUGMSG(ZONE_FUNCTION, (TEXT("CSPI_DllEntry: DLL_PROCESS_ATTACH lpvReserved(0x%x)\r\n"), 
                lpvReserved));
            DisableThreadLibraryCalls((HMODULE) hInstDll);
            break;

        case DLL_PROCESS_DETACH:
            DEBUGMSG(ZONE_FUNCTION, (TEXT("CSPI_DllEntry: DLL_PROCESS_DETACH lpvReserved(0x%x)\r\n"),
                lpvReserved));
            break;
    }

    return TRUE;    // return TRUE for success
}