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

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

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

     5 // which accompanies this distribution, and is available

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

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // e32\drivers\iic_transaction.cpp

    15 // IIC Transaction API Implementation

    16 //

    17 

    18 #include <drivers/iic_transaction.h>

    19 #include <drivers/iic_channel.h>

    20 

    21 EXPORT_C void TIicBusSlaveCallback::DfcFunc(TAny* aPtr)

    22     {

    23     TIicBusSlaveCallback* pCb = (TIicBusSlaveCallback*) aPtr;

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

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

    26 	DIicBusChannelSlave* chan = pCb->iChannel;

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

    28 

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

    30 	//

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

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

    33 	TInt8 callbackTrig = 0;

    34 	TInt callbackRet = 0;

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

    36 	if(nextSteps & DIicBusChannelSlave::EStopTimer)

    37 		{

    38 		chan->StopTimer();

    39 		}

    40 	if(nextSteps & DIicBusChannelSlave::EInvokeCb)

    41 		{

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

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

    44 		pCb->iTrigger = 0;

    45 		pCb->iReturn = KErrNone;

    46 		pCb->iRxWords = 0;

    47 		pCb->iTxWords = 0;

    48 		}

    49 	if(nextSteps & DIicBusChannelSlave::EStartTimer)

    50 		{

    51 		chan->StartTimerByState();

    52 		}

    53     }