diff -r 000000000000 -r a41df078684a kernel/eka/drivers/iic/iic_transaction.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/drivers/iic/iic_transaction.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,53 @@
+// 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();
+		}
+    }