pwmmdd.c

freescale i.mx31 BSP CE5.0全部源码

//
// This function restores power to a device.
//
// Parameters:
//      hDeviceContext
//          [in] Handle to the device context.
//
// Returns:
//      None.
//
//------------------------------------------------------------------------------
void PWM_PowerUp(void)
{
   DEBUGMSG(ZONE_FUNCTION, (TEXT("++PWM_PowerUp\r\n")));
   PwmReset();
   DEBUGMSG(ZONE_FUNCTION, (TEXT("--PWM_PowerUp\r\n")));
}


//------------------------------------------------------------------------------
//
// Function: PWM_Read
//
// This function reads contents of 6 PWM registers.
//
// 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 PWM_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count)
{
   DEBUGMSG(ZONE_FUNCTION, (TEXT("++PWM_Read\r\n")));

   if(!PwmReadRegister((UINT32 *)pBuffer, Count))
    return (-1);

   DEBUGMSG(ZONE_FUNCTION, (TEXT("--PWM_Read\r\n")));
   return Count;
}


//------------------------------------------------------------------------------
//
// Function: PWM_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.
//
//      dwNumBytes
//          [in] Number of bytes to write from the pBuffer buffer into the
//          device.
//
// Returns:
//      The number of bytes written indicates success. A value of -1 indicates
//      failure.
//
//------------------------------------------------------------------------------
DWORD PWM_Write(DWORD Handle, LPCVOID pBuffer, DWORD dwNumBytes)
{
   DWORD ret = dwNumBytes;
   DEBUGMSG(ZONE_FUNCTION, (TEXT("++PWM_Write\r\n")));

   // dwNumBytes is the number of pwm samples in the buffer
   if(!PwmPlaySample((LPCVOID)pBuffer, dwNumBytes))
   {
         dwNumBytes = 0;
         return (-1);
   }
   DEBUGMSG(ZONE_FUNCTION, (TEXT("--PWM_Write\r\n")));
   return ret;
}

//------------------------------------------------------------------------------
//
// Function: PWM_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 PWM_IOControl(DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn,
                                      DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut,
                                      PDWORD pdwActualOut)
{
    BOOL bRet = FALSE;

    switch(dwCode)
    {
       case PWM_IOCTL_RESET:
                PwmReset();
                bRet = TRUE;
                DEBUGMSG(ZONE_IOCTL, (TEXT("PWM_IOControl: PWM_IOCTL_RESET occurred\r\n")));
                break;
       case IOCTL_POWER_CAPABILITIES:
                if (!pBufOut || dwLenOut < sizeof(POWER_CAPABILITIES) || !pdwActualOut)
               {
                       SetLastError(ERROR_INVALID_PARAMETER);
                       bRet = FALSE;
                }
                else 
                {
                       PPOWER_CAPABILITIES power = (PPOWER_CAPABILITIES)pBufOut;
                       memset(power, 0, sizeof(POWER_CAPABILITIES));
                       SetPwmPower(power);          // get configurations from PDD layer
                       *pdwActualOut = sizeof(POWER_CAPABILITIES);
                       bRet = TRUE;
                 }
                 break;

    case IOCTL_POWER_GET:
            if(pBufOut != NULL && dwLenOut == sizeof(CEDEVICE_POWER_STATE))
           {
                    *(PCEDEVICE_POWER_STATE)pBufOut = CurrentDx;
                    bRet = TRUE;
            }
            break;
    case IOCTL_POWER_SET:
             if(pBufOut != NULL && dwLenOut == sizeof(CEDEVICE_POWER_STATE))
            {
                     CEDEVICE_POWER_STATE NewDx = *(PCEDEVICE_POWER_STATE)pBufOut;
                     if(VALID_DX(NewDx))
                     {
                            if(NewDx == D1) 
                           {
                                NewDx = D0;
                            }
                            if(NewDx == D3) 
                           {
                                NewDx = D4;    // turn off
                            }
                            if(NewDx == D0) 
                           {
                                if (!BSPPwmSetClockGatingMode(TRUE))
                                {
                                    DEBUGMSG(ZONE_ERROR, (TEXT("Error enabling PWM clock mode.\r\n")));
                                }                        
                            }
                            if(NewDx == D4) 
                           {
                                if (!BSPPwmSetClockGatingMode(FALSE))
                                {
                                    DEBUGMSG(ZONE_ERROR, (TEXT("Error disabling PWM clock mode.\r\n")));
                                }                                 
                            }
                            CurrentDx = NewDx;
                            bRet = TRUE;
                     }
                     else
                     {
                            DEBUGMSG(ZONE_WARN, (TEXT("DUM_IOControl: IOCTL_POWER_SET: invalid state request %u\r\n"), NewDx));
                     }
              }
              break; 
        default:
              DEBUGMSG(ZONE_WARN, (TEXT("PWM_IOControl: No matching IOCTL.\r\n")));
              break;
    }
    return bRet;
}

BOOL WINAPI PWM_DllEntry(HANDLE hInstDll, DWORD dwReason, LPVOID lpvReserved)
{
    switch (dwReason)
    {
         case DLL_PROCESS_ATTACH:
                 //Register Debug Zones
                 DEBUGREGISTER((HINSTANCE) hInstDll);
                 DEBUGMSG(ZONE_INFO, (TEXT("PWM_DllEntry: DLL_PROCESS_ATTACH lpvReserved(0x%x)\r\n"),lpvReserved));
                 DisableThreadLibraryCalls((HMODULE) hInstDll);
                 break;

         case DLL_PROCESS_DETACH:
                  DEBUGMSG(ZONE_INFO, (TEXT("PWM_DllEntry: DLL_PROCESS_DETACH lpvReserved(0x%x)\r\n"),lpvReserved));
                  break;
   }
   // Return TRUE for success
   return TRUE;
}