pvr_bridge_u.c

Lido PXA270平台开发板的最新BSP,包括源代码

/*!****************************************************************************
@File			pvr_bridge_u.c

@Title			WinCE bridging code

@Author			Imagination Technologies

@date   		16 September 2003
 
@Copyright     	Copyright 2003-2004 by Imagination Technologies Limited.
                All rights reserved. No part of this software, either
                material or conceptual may be copied or distributed,
                transmitted, transcribed, stored in a retrieval system
                or translated into any human or computer language in any
                form by any means, electronic, mechanical, manual or
                other-wise, or disclosed to third parties without the
                express written permission of Imagination Technologies
                Limited, Unit 8, HomePark Industrial Estate,
                King's Langley, Hertfordshire, WD4 8LZ, U.K.

@Platform		WinCE

@Description	WinCE bridging code

@DoxygenVer		

******************************************************************************/

/******************************************************************************
Modifications :-

$Log: pvr_bridge_u.c $
*****************************************************************************/

#include <windows.h>
#include "img_defs.h"
#include "services.h"
#include "pvr_bridge.h"
#include "pvr_debug.h"

/*!
*****************************************************************************
 @Function	: OpenServices
    
 @Description	: opens a services connection

 @Input	: szDevicePath - Specifies the device driver to open
 @Output : phServices - handle for connection
		  
 @Return	: PVRSRV_ERROR
*****************************************************************************/
PVRSRV_ERROR OpenServices(IMG_CHAR* szDevicePath, IMG_HANDLE *phServices)
{
	IMG_HANDLE hPVRServices;

	hPVRServices = (IMG_HANDLE) GetDC(NULL);

	if((IMG_INT32)hPVRServices > 0)
	{
		IMG_BOOL bConnecting = IMG_TRUE;

		*phServices = hPVRServices;

		PVRSRVBridgeCall(	hPVRServices, 
							PVRSRV_BRIDGE_CONNECT_SERVICES, 
							IMG_NULL, 
							0, 
							&bConnecting, 
							sizeof(bConnecting));

		return(PVRSRV_OK);
	}
	else
	{
		PVR_DPF((PVR_DBG_ERROR, "Cannot open device driver %s.\n", szDevicePath));
	}

	return PVRSRV_ERROR_INIT_FAILURE;
}



/*!
*****************************************************************************
 @Function	: CloseServices
    
 @Description	: closes a services connection

 @Input : hServices - handle for connection
		  
 @Return	: PVRSRV_ERROR
*****************************************************************************/
PVRSRV_ERROR CloseServices(IMG_HANDLE hServices)
{
	if(hServices)
	{
		IMG_BOOL bConnecting = IMG_FALSE;

		PVRSRVBridgeCall(	hServices, 
							PVRSRV_BRIDGE_CONNECT_SERVICES, 
							IMG_NULL, 
							0, 
							&bConnecting, 
							sizeof(bConnecting));

		if(ReleaseDC(NULL, (HDC)hServices) == 0)
		{
			return PVRSRV_ERROR_GENERIC;
		}
	}
	else
	{
		return PVRSRV_ERROR_INVALID_PARAMS;
	}

	return PVRSRV_OK;
}



/*!
*****************************************************************************
 @Function	: PVRSRVBridgeCall
    
 @Description	: To call a kernel-resident function from user space

 @Input : hServices - handle for connection

 @Input : ui32FunctionID - function index

 @Input : pvParamIn
 @Input : ui32InBufferSize
 @Input : pvParamOut
 @Input : ui32OutBufferSize
		  
 @Return	: IMG_RESULT
*****************************************************************************/
IMG_RESULT PVRSRVBridgeCall(IMG_HANDLE hServices,
							IMG_UINT32 ui32FunctionID,
							IMG_VOID *pvParamIn,
							IMG_UINT32 ui32InBufferSize,
							IMG_VOID *pvParamOut,
							IMG_UINT32	ui32OutBufferSize)
{
	IMG_UINT32	ui32RetVal;

	ui32RetVal = ExtEscape (hServices, 
							ui32FunctionID, 
							ui32InBufferSize, 
							pvParamIn,  
					 		ui32OutBufferSize, 
					 		pvParamOut);
	if (ui32RetVal <  0)
	{
		PVR_DPF((PVR_DBG_ERROR, "ExtEscape failed.\n"));		
	}

	return ui32RetVal;
}