// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// e32\drivers\iic_transaction.cpp

// IIC Transaction API Implementation

//

#include <drivers/iic_transaction.h>

#include <drivers/iic_channel.h>

EXPORT_C void TIicBusSlaveCallback::DfcFunc(TAny* aPtr)

    {

    TIicBusSlaveCallback* pCb = (TIicBusSlaveCallback*) aPtr;

	// pCb can be NULL if a client corrupt it after the dfc has been queued

    __ASSERT_DEBUG(pCb != NULL, Kern::Fault(KIicPanic,__LINE__));

	DIicBusChannelSlave* chan = pCb->iChannel;

	__ASSERT_DEBUG(chan != NULL, Kern::Fault(KIicPanic,__LINE__));

	chan->ProcessData(pCb->iTrigger, pCb); // Call PSL to fill in iReturn, iRxWords and/or iTxWords

	//

	// Only invoke the client's callback (and update the state machine) if asynchronous channel capture has

	// completed, or if one of the requested triggers has occurred or if a bus error has been witnessed

	TInt8 callbackTrig = 0;

	TInt callbackRet = 0;

	TInt nextSteps = chan->UpdateReqTrig(callbackTrig, callbackRet);

	if(nextSteps & DIicBusChannelSlave::EStopTimer)

		{

		chan->StopTimer();

		}

	if(nextSteps & DIicBusChannelSlave::EInvokeCb)

		{

		(pCb->iCallback)(pCb->iChannelId, callbackRet, (TInt)callbackTrig, pCb->iRxWords, pCb->iTxWords, pCb->iParam);

		// Callback now processed, so re-initialise callback object members

		pCb->iTrigger = 0;

		pCb->iReturn = KErrNone;

		pCb->iRxWords = 0;

		pCb->iTxWords = 0;

		}

	if(nextSteps & DIicBusChannelSlave::EStartTimer)

		{

		chan->StartTimerByState();

		}

    }