sl@0: // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // e32\drivers\iic_channel.cpp
sl@0: // IIC Channel Platform Independent Layer (PIL)
sl@0: //
sl@0: 
sl@0: #include <drivers/iic_channel.h>
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: #include <drivers/iic_trace.h>
sl@0: #endif
sl@0: 
sl@0: // The timer call back function which calls the PSL's HandleSlaveTimeout()
sl@0: // Note that this assumes that the channel thread has been unblocked - if this
sl@0: // is not the case, the callback will never get to run
sl@0: 
sl@0: TInt DIicBusChannelMaster::DoCreate()
sl@0:     {return KErrNone;}
sl@0: 
sl@0: void DIicBusChannelMaster::Lock()
sl@0:     {NKern::FMWait(&iTransactionQLock);}
sl@0: 
sl@0: void DIicBusChannelMaster::Unlock()
sl@0:     {NKern::FMSignal(&iTransactionQLock);}
sl@0: 
sl@0: TIicBusTransaction* DIicBusChannelMaster::NextTrans(TIicBusTransaction* aTrans)
sl@0:     {
sl@0:     // call multi-transaction call back function to get next transaction
sl@0:     if((aTrans->iFlags&KTransactionWithPreamble)&&(aTrans->iFlags&KTransactionWithMultiTransc))
sl@0:         return ((TIicBusTransactionPreambleExt*)aTrans)->iMultiTransc(aTrans, ((TIicBusTransactionPreambleExt*)aTrans)->iMultiTranscArg);
sl@0:     else if(aTrans->iFlags&KTransactionWithMultiTransc)
sl@0:         return ((TIicBusTransactionMultiTransc*)aTrans)->iMultiTransc(aTrans, ((TIicBusTransactionMultiTransc*)aTrans)->iMultiTranscArg);
sl@0:     else
sl@0:         return NULL;
sl@0:     }
sl@0: 
sl@0: void DIicBusChannelMaster::UnlockAndKick()
sl@0:     {iTransQDfc.Enque(&iTransactionQLock);}
sl@0: 
sl@0: void DIicBusChannelMaster::SlaveTimeoutCallback(TAny* aPtr)
sl@0: 	{
sl@0: 
sl@0: 	DIicBusChannelMaster* aChanMaster=(DIicBusChannelMaster* )aPtr;
sl@0: 	TInt r = aChanMaster->HandleSlaveTimeout();
sl@0: 	aChanMaster->CompleteRequest(r);
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::TransFlow(TIicBusTransaction* aTransaction)
sl@0:     {
sl@0:     if(aTransaction->iHalfDuplexTrans == NULL)
sl@0:         return KErrArgument;
sl@0:     else if(aTransaction->iFullDuplexTrans == NULL)
sl@0:         return DIicBusChannel::EHalfDuplex;
sl@0:     else return DIicBusChannel::EFullDuplex;
sl@0:     }
sl@0: 
sl@0: TInt8 DIicBusChannelMaster::IsMasterBusy()
sl@0:     {
sl@0:     if((iTransCount&~KTransCountMsBit) == 0)
sl@0:         return 0;
sl@0:     else return 1;
sl@0:     }
sl@0: 
sl@0: DIicBusChannelMaster::DIicBusChannelMaster(TBusType aBusType, TChannelDuplex aChanDuplex)
sl@0: 		: DIicBusChannel(DIicBusChannel::EMaster, aBusType, aChanDuplex),
sl@0: 		iTransQDfc(DIicBusChannelMaster::MsgQFunc, this, NULL, 1), iChannelReady(EFalse)
sl@0: 	{
sl@0: 	new(&iTimeoutTimer) NTimer(SlaveTimeoutCallback,this);
sl@0: 	}
sl@0: 
sl@0: DIicBusChannelMaster::~DIicBusChannelMaster()
sl@0: 	{
sl@0: 	delete iSlaveTimeoutDfc;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::Init()
sl@0: 	{
sl@0: 	iSlaveTimeoutDfc = new TDfc(SlaveTimeoutCallback,(TAny*)this, 7);	// Highest Dfc priority
sl@0: 	if(!iSlaveTimeoutDfc)
sl@0: 		return KErrNoMemory;
sl@0: 	else
sl@0: 		return KErrNone;
sl@0: 	}
sl@0: 
sl@0: // Function to used to indicate if the Slave response has exceeded
sl@0: // an expected time
sl@0: TInt DIicBusChannelMaster::StartSlaveTimeOutTimer(TInt aTime)
sl@0: 	{
sl@0: 	TInt r = iTimeoutTimer.OneShot(NKern::TimerTicks(aTime),(*iSlaveTimeoutDfc));
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelMaster::SetDfcQ(TDfcQue* aDfcQue)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::SetDfcQ 0x%x\n",aDfcQue));
sl@0: 	__ASSERT_DEBUG(aDfcQue!=NULL, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 	iDfcQ=aDfcQue;
sl@0: 	iTransQDfc.SetDfcQ(iDfcQ);
sl@0: 	iSlaveTimeoutDfc->SetDfcQ(iDfcQ);
sl@0: 	Lock();
sl@0: 	__ASSERT_DEBUG(!iChannelReady, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 	if (!iTransactionQ.IsEmpty())
sl@0: 		{
sl@0: 		iTransaction=(TIicBusTransaction*)(iTransactionQ.First()->Deque());
sl@0: 		__KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::SetDfcQ got %08x",iTransaction));
sl@0: 		iTransaction->iState=TIicBusTransaction::EAccepted;
sl@0: 		iCurrentTransaction = iTransaction;
sl@0: 		UnlockAndKick();
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		__KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::SetDfcQ"));
sl@0: 		iChannelReady=ETrue;
sl@0: 		iTransaction=NULL;
sl@0: 		iCurrentTransaction = NULL;
sl@0: 		Unlock();
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelMaster::CompleteRequest(TInt aResult)
sl@0: 	{
sl@0: 	TIicBusTransaction* nextTrans=NextTrans(iCurrentTransaction);
sl@0: 
sl@0: 	if((aResult != KErrNone)||(nextTrans == NULL))
sl@0: 		EndTransaction(iTransaction,aResult,iTransaction->iCallback);
sl@0: 	else
sl@0: 		{
sl@0: 		nextTrans->iBusId = iCurrentTransaction->iBusId; // Pass the bus configuration info to the PSL
sl@0: 		iCurrentTransaction = nextTrans;
sl@0: 		DoRequest(nextTrans);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: #ifdef MASTER_MODE
sl@0: 
sl@0: /*
sl@0: For Master-side transaction queuing APIs
sl@0: the Channel implementation sends the transaction as a message to the Channel's message queue,
sl@0: optionally blocking the client thread on the message's semaphore (synchronous APIs).
sl@0: */
sl@0: TInt DIicBusChannelMaster::QueueTransaction(TIicBusTransaction* aTransaction)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::QueueTransaction, aTransaction=0x%x\n",aTransaction));
sl@0: 	// Send the transaction as a message to the Channel's message queue
sl@0: 	// Synchronous API, so block the calling thread during the processing
sl@0: 	TInt r = QueueTransaction(aTransaction, NULL);
sl@0: 	if(r!=KErrNone)
sl@0: 		return r;	// Transaction was not queued - so don't wait for a notification that it completed.
sl@0: 
sl@0: 	__KTRACE_OPT(KIIC, Kern::Printf("<DIicBusChannelMaster::QueueTransaction ret %d",aTransaction->iResult));
sl@0: 	return aTransaction->iResult;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::QueueTransaction(TIicBusTransaction* aTransaction, TIicBusCallback* aCallback)
sl@0: 	{
sl@0: 	__KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::QueueTransaction, aTransaction=0x%x, aCallback=0x%x\n",aTransaction,aCallback));
sl@0: 
sl@0: 	// Check aTransaction is non-NULL (aCallback may be NULL if the synchronous operation is required).
sl@0: 	if(aTransaction == NULL)
sl@0: 		{
sl@0: 		return KErrArgument;
sl@0: 		}
sl@0: 
sl@0: 	// Send the transaction as a message to the Channel's message queue and return
sl@0: 	aTransaction->iCallback = aCallback;
sl@0: 	if(aCallback != NULL)
sl@0: 		{
sl@0: 		aCallback->iTransaction = aTransaction;
sl@0: 		}
sl@0: 
sl@0: 	// Call the PSL implementation to check that the header is valid for this channel
sl@0: 	TInt r = CheckHdr(aTransaction->iHeader);
sl@0: 	if(r!=KErrNone)
sl@0: 		{
sl@0: 		return r;
sl@0: 		}
sl@0: 
sl@0: 	// Duplex operation is indicated in the transaction object
sl@0: 	if((TransFlow((TIicBusTransaction*)aTransaction) == DIicBusChannel::EFullDuplex) &&
sl@0: 	   (ChannelDuplex()                              != DIicBusChannel::EFullDuplex))
sl@0: 		{
sl@0: 		return KErrNotSupported;
sl@0: 		}
sl@0: 
sl@0: 	DThread* pC =& Kern::CurrentThread();
sl@0: 	Lock();
sl@0: 	__ASSERT_DEBUG(aTransaction->iState == TIicBusTransaction::EFree, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 	if(!(iTransCount & KTransCountMsBit))
sl@0: 		{
sl@0: 		if(iTransCount < ~KTransCountMsBit)
sl@0: 			{
sl@0: 			++iTransCount;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			Unlock();
sl@0: 			return KErrOverflow;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	aTransaction->iSyncNotification.iCount = 0;
sl@0: 	aTransaction->iSyncNotification.iOwningThread = &pC->iNThread;
sl@0: 	pC->Open();
sl@0: 	if (iChannelReady)
sl@0: 		{
sl@0: 		aTransaction->iState = TIicBusTransaction::EAccepted;
sl@0: 		iTransaction = aTransaction;
sl@0: 		iCurrentTransaction = aTransaction;
sl@0: 		iChannelReady = EFalse;
sl@0: 		UnlockAndKick();
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		iTransactionQ.Add(aTransaction);
sl@0: 		aTransaction->iState = TIicBusTransaction::EDelivered;
sl@0: 		Unlock();
sl@0: 		}
sl@0: 
sl@0: 	// Wait on a semaphore if called from synchronous version
sl@0: 	if(aCallback == NULL)
sl@0: 		{
sl@0: 		NKern::FSWait(&aTransaction->iSyncNotification);
sl@0: 		}
sl@0: 
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::CancelTransaction(TIicBusTransaction* aTransaction)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::CancelTransaction, aTransaction=0x%x\n",aTransaction));
sl@0: 
sl@0: 	// Check aTransaction is non-NULL
sl@0: 	if(aTransaction == NULL)
sl@0: 		{
sl@0: 		return KErrArgument;
sl@0: 		}
sl@0: 	// If the method is called on a synchronous transaction return KErrNotSupported
sl@0: 	if(aTransaction->iCallback == NULL)
sl@0: 		{
sl@0: 		return KErrNotSupported;
sl@0: 		}
sl@0: 	DThread* pT = NULL;
sl@0: 	Lock();
sl@0: 
sl@0: 	TInt r = KErrNone;
sl@0: 	switch(aTransaction->iState)
sl@0: 		{
sl@0: 		case TIicBusTransaction::EDelivered:
sl@0: 			{
sl@0: 			aTransaction->Deque();
sl@0: 			pT=_LOFF(aTransaction->iSyncNotification.iOwningThread,DThread,iNThread);
sl@0: 			aTransaction->iState=TIicBusTransaction::EFree;
sl@0: 			--iTransCount; // Count must be greater than zero if the transaction is in this state
sl@0: 			r = KErrCancel;
sl@0: 			break;
sl@0: 			}
sl@0: 
sl@0: 		case TIicBusTransaction::EAccepted:
sl@0: 			{
sl@0: 			r = KErrInUse;
sl@0: 			break;
sl@0: 			}
sl@0: 
sl@0: 		case TIicBusTransaction::EFree:
sl@0: 			{
sl@0: 			r = KErrCancel;
sl@0: 			break;
sl@0: 			}
sl@0: 		}
sl@0: 	Unlock();
sl@0: 	if (pT)
sl@0: 		{
sl@0: 		pT->AsyncClose();
sl@0: 		}
sl@0: 
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: #else /*MASTER_MODE*/
sl@0: 
sl@0: TInt DIicBusChannelMaster::QueueTransaction(TIicBusTransaction* /*aTransaction*/)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::QueueTransaction invoked when not in MASTER_MODE!\n"));
sl@0: 	return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::QueueTransaction(TIicBusTransaction* /*aTransaction*/, TIicBusCallback* /*aCallback*/)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::QueueTransaction invoked when not in MASTER_MODE!\n"));
sl@0: 	return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::CancelTransaction(TIicBusTransaction* /*aTransaction*/)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::CancelTransaction invoked when not in MASTER_MODE!\n"));
sl@0: 	return KErrNotSupported;
sl@0: 	}
sl@0: #endif/*MASTER_MODE*/
sl@0: 
sl@0: // Invoked in response to receiving a message
sl@0: // Function argument is a pointer to the required channel object
sl@0: // Invoke the channel's PSL implementation of the DoRequest method with a pointer to the transaction object
sl@0: //
sl@0: void DIicBusChannelMaster::MsgQFunc(TAny* aPtr)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::MsgQFunc, aPtr=0x%x\n",aPtr));
sl@0: 	DIicBusChannelMaster* channel=(DIicBusChannelMaster*)aPtr;
sl@0: 	TIicBusTransaction* trans = channel->iTransaction;
sl@0: 
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: 	IIC_MPROCESSTRANS_START_PIL_TRACE;
sl@0: #endif
sl@0: 
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::MsgQFunc trans->iHeader=0x%x\n",trans->iHeader));
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::MsgQFunc trans->iHalfDuplexTrans=0x%x\n",trans->iHalfDuplexTrans));
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::MsgQFunc trans->iFullDuplexTrans=0x%x\n",trans->iFullDuplexTrans));
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::MsgQFunc trans->iCallback=0x%x\n",trans->iCallback));
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelMaster::MsgQFunc trans->iFlags=0x%x\n",trans->iFlags));
sl@0: 
sl@0: 	TInt r = KErrNone;
sl@0: 	// invoke the preamble callback function supplied by the client of the IIC if there is any
sl@0: 	if(GetTransFlags(trans) & KTransactionWithPreamble)
sl@0: 		{
sl@0: 		TIicBusTransactionPreamble* transPreamble = (TIicBusTransactionPreamble*)trans;
sl@0: 		TIicBusPreamble funcPtr=NULL;
sl@0: 		funcPtr=(GetPreambleFuncPtr(transPreamble));
sl@0: 		funcPtr(transPreamble,GetPreambleFuncArg(transPreamble));
sl@0: 		}
sl@0: 	r = channel->DoRequest(trans);	// Instigate processing in the PSL
sl@0: 	if(r!=KErrNone)
sl@0: 		channel->EndTransaction(trans, r, trans->iCallback);
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelMaster::EndTransaction(TIicBusTransaction* aTrans, TInt aResult, TIicBusCallback* aCb)
sl@0: 	{
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: 	IIC_MPROCESSTRANS_END_PIL_TRACE;
sl@0: #endif
sl@0: 	Complete(aResult,aTrans);
sl@0: 	if(aCb != NULL)
sl@0: 		{
sl@0: 		aCb->iResult = aResult;
sl@0: 		aCb->Enque();
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelMaster::CancelTimeOut()
sl@0: 	{
sl@0: 	iTimeoutTimer.Cancel();
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelMaster::Complete(TInt aResult, TIicBusTransaction* aTransaction) //Completes a kernel message and receive the next one
sl@0: 	{
sl@0: 	__KTRACE_OPT(KIIC, Kern::Printf("MsgB::Complete %08x, %d",this,aResult));
sl@0: 	Lock();
sl@0: 	__ASSERT_DEBUG(aTransaction->iState == TIicBusTransaction::EAccepted, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 	aTransaction->iResult=aResult;
sl@0: 	aTransaction->iState=TIicBusTransaction::EFree;
sl@0: 	--iTransCount;
sl@0: 	DThread* pT=_LOFF(aTransaction->iSyncNotification.iOwningThread,DThread,iNThread);
sl@0: 	__ASSERT_DEBUG(!iChannelReady, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 	if (!iTransactionQ.IsEmpty())
sl@0: 		{
sl@0: 		TIicBusTransaction* pM=(TIicBusTransaction*)iTransactionQ.First()->Deque();
sl@0: 		__KTRACE_OPT(KIIC, Kern::Printf("rxnext: got %08x",pM));
sl@0: 		pM->iState=TIicBusTransaction::EAccepted;
sl@0: 		iTransaction = pM;
sl@0: 		iCurrentTransaction = pM;
sl@0: 		iTransQDfc.Enque();
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		__KTRACE_OPT(KIIC, Kern::Printf("rxnext"));
sl@0: 		iChannelReady=ETrue;
sl@0: 		iTransaction=NULL;
sl@0: 		iCurrentTransaction = NULL;
sl@0: 		}
sl@0: 	NKern::FSSignal(&aTransaction->iSyncNotification,&iTransactionQLock);
sl@0: 	pT->AsyncClose();
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::StaticExtension(TUint /*aFunction*/, TAny* /*aParam1*/, TAny* /*aParam*/)
sl@0:  	{
sl@0:  	return KErrNotSupported;
sl@0:  	}
sl@0: 
sl@0: TInt DIicBusChannelMaster::Spare1(TInt /*aVal*/, TAny* /*aPtr1*/, TAny* /*aPtr2*/)
sl@0: 	{
sl@0: 	return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: #ifdef SLAVE_MODE
sl@0: 
sl@0: TInt DIicBusChannelSlave::CaptureChannel(TDes8* aConfigHdr, TIicBusSlaveCallback* aCallback, TInt& aChannelId, TBool aAsynch)
sl@0: 	{
sl@0: 	// Only one client can have access to the Slave channel at any one time. Any subsequent attempts to capture the
sl@0: 	// same channel should return an error.
sl@0: 	//
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::CaptureChannel\n"));
sl@0: 	if((aConfigHdr == NULL) || (aCallback == NULL))
sl@0: 		{
sl@0: 	    __KTRACE_OPT(KIIC, Kern::Printf("ERROR: non-NULL argument aConfigHdr=0x%x, aCallback=0x%x\n",aConfigHdr,aCallback));
sl@0: 		return KErrArgument;
sl@0: 		}
sl@0: 	//
sl@0: 	// Check the header is valid for the channel
sl@0: 	TInt r = CheckHdr(aConfigHdr);
sl@0: 	if(r == KErrNone)
sl@0: 		{
sl@0: 		// Check Slave channel is available for capture
sl@0: 		// If iChannelInUse is not set, capture should succeed
sl@0: 		// If this Slave channel is part of a MasterSlave channel iChannelInUse will already be set
sl@0: 		// but iClient will still be NULL. In this case, the capture should succeed.
sl@0: 		TInt intState=__SPIN_LOCK_IRQSAVE(iSpinLock);
sl@0: 		DThread* pT=&(Kern::CurrentThread());
sl@0: 		if((iChannelInUse)&&(iClient!=NULL))
sl@0: 			r=KErrInUse;
sl@0: 		else
sl@0: 			{
sl@0: 			iChannelInUse=1;
sl@0: 			iClient=pT;
sl@0: 			}
sl@0: 		__SPIN_UNLOCK_IRQRESTORE(iSpinLock,intState);
sl@0: 
sl@0: 		if(r == KErrNone)
sl@0: 			{
sl@0: 			iClient->Open();
sl@0: 			aCallback->iChannel=this;
sl@0: 			iNotif = aCallback;
sl@0: 			iConfigHeader=aConfigHdr;	// Header alread checked, so just assign it
sl@0: 
sl@0: 			// Invoke the PSL processing
sl@0: 			if(aAsynch)
sl@0: 				{
sl@0: 				aChannelId = 0; // the client should read iChannelId from the callback object.
sl@0: 				r=DoRequest(EAsyncConfigPwrUp);
sl@0: 				}
sl@0: 			else
sl@0: 				r=DoRequest(ESyncConfigPwrUp);
sl@0: 
sl@0: 			if(r == KErrNone)
sl@0: 				{
sl@0: 				if(!aAsynch)	// For asynchronous version there is nothing more to do until the callback is invoked
sl@0: 					{
sl@0: 					SetChannelId(aChannelId);
sl@0: 					iClientTimeoutDfc->SetDfcQ(iNotif->iDfcQ);
sl@0: 					}
sl@0: 				}
sl@0: 			else
sl@0: 				{
sl@0: 				// PSL encountered an error
sl@0: 				ReleaseChannel();
sl@0: 				if(aAsynch)
sl@0: 					CompleteAsynchCapture(r);	// Queue the client callback for execution
sl@0: 				}
sl@0: 			}
sl@0: 		}
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::ReleaseChannel()
sl@0: 	{
sl@0: 	__KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::ReleaseChannel\n"));
sl@0: 	 // Release a previously-captured channel.
sl@0: 	TInt r=KErrNone;;
sl@0: 	// Ensure that only the channel's client may release the channel
sl@0: 	DThread* pT=&(Kern::CurrentThread());
sl@0: 	if(iClient!=pT)			// Direct access since iClient can't be modified while channel is still captured
sl@0: 		return KErrAccessDenied;
sl@0: 
sl@0: 	r=SetNotificationTrigger(0);			// Attempt to clear notification requests
sl@0: 	if((r!=KErrNone)&&(r!=KErrTimedOut))	// KErrTimedOut refers to an earlier transaction, and is for information only
sl@0: 		return r;
sl@0: 	iTimeoutTimer.Cancel();
sl@0: 	r=DoRequest(EPowerDown);
sl@0: 	if(r == KErrNone)
sl@0: 		{
sl@0: 		TInt intState=__SPIN_LOCK_IRQSAVE(iSpinLock);
sl@0: 		iClient=NULL;
sl@0: 		iChannelInUse=0;	// Channel now available for capture by other clients
sl@0: 		__SPIN_UNLOCK_IRQRESTORE(iSpinLock,intState);
sl@0: 		pT->AsyncClose();	// Allow Client thread to close now channel has been released
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		// PSL error when releasing the channel - have to assume the hardware has a problem.
sl@0: 		// The channel is no longer considered "captured" by the controller, i.e. will not accept commands
sl@0: 		// But not having cleared the busy flag means that it can not be used for master channel
sl@0: 		// operations if it is part of a MasterSlave channel
sl@0: 		// Must Fault the Kernel.
sl@0: 		__KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::ReleaseChannel - PSL returned error code %d\n",r));
sl@0: 		__ASSERT_ALWAYS(EFalse, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 		}
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::RegisterRxBuffer(TPtr8 aRxBuffer, TInt8 aBufGranularity, TInt8 aNumWords, TInt8 aOffset)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::RegisterRxBuffer\n"));
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: 	IIC_SREGRXBUF_START_PIL_TRACE;
sl@0: #endif
sl@0: 	TInt r=KErrNone;
sl@0: 	// Ensure that only the channel's client may perform this operation
sl@0: 	DThread* pT=&(Kern::CurrentThread());
sl@0: 	if(iClient!=pT)			// Direct access since iClient can't be modified while channel is still captured
sl@0: 		return KErrAccessDenied;
sl@0: 	//If the buffer pointer is NULL, return KErrArgument
sl@0: 	if(aRxBuffer.Ptr() == NULL)
sl@0: 		return KErrArgument;
sl@0: 	// If a buffer is already registered, a subsequent request to do the same should return KErrAlreadyExists
sl@0: 	// This will be the case if SetNotificationTrigger has been invoked with any of ERxAllBytes, ERxUnderrun or ERxOverrun
sl@0: 	if(iReqTrig&(ERxAllBytes|ERxUnderrun|ERxOverrun))
sl@0: 		r=KErrAlreadyExists;
sl@0: 	else
sl@0: 		{
sl@0: 		iRxBuf=(TInt8*)(aRxBuffer.Ptr());
sl@0: 		iRxGranularity=aBufGranularity;
sl@0: 		iNumRxWords=aNumWords;
sl@0: 		iRxOffset=aOffset;
sl@0: 		}
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: 	IIC_SREGRXBUF_END_PIL_TRACE;
sl@0: #endif
sl@0: 	 return r;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::RegisterTxBuffer(TPtr8 aTxBuffer, TInt8 aBufGranularity, TInt8 aNumWords, TInt8 aOffset)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::RegisterTxBuffer	- default implementation\n"));
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: 	IIC_SREGTXBUF_START_PIL_TRACE;
sl@0: #endif
sl@0: 	TInt r=KErrNone;
sl@0: 	// Ensure that only the channel's client may perform this operation
sl@0: 	DThread* pT=&(Kern::CurrentThread());
sl@0: 	if(iClient!=pT)			// Direct access since iClient can't be modified while channel is still captured
sl@0: 		return KErrAccessDenied;
sl@0: 	//If the buffer pointer is NULL, return KErrArgument
sl@0: 	if(aTxBuffer.Ptr() == NULL)
sl@0: 		return KErrArgument;
sl@0: 	// If a buffer is already registered and a request is pending, a subsequent request to register a buffer should return
sl@0: 	// KErrAlreadyExists
sl@0: 	// This will be the case if SetNotificationTrigger has been invoked with any of ETxAllBytes, ETxUnderrun or ETxOverrun
sl@0: 	if(iReqTrig&(ETxAllBytes|ETxUnderrun|ETxOverrun))
sl@0: 		r=KErrAlreadyExists;
sl@0: 	else
sl@0: 		{
sl@0: 		iTxBuf=(TInt8*)(aTxBuffer.Ptr());
sl@0: 		iTxGranularity=aBufGranularity;
sl@0: 		iNumTxWords=aNumWords;
sl@0: 		iTxOffset=aOffset;
sl@0: 		}
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: 	IIC_SREGTXBUF_END_PIL_TRACE;
sl@0: #endif
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::SetNotificationTrigger(TInt aTrigger)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::SetNotificationTrigger invoked with aTrigger=0x%x\n",aTrigger));
sl@0: 	// Ensure that only the channel's client may perform this operation
sl@0: 	DThread* pT=&(Kern::CurrentThread());
sl@0: 	if(iClient!=pT)			// Direct access since iClient can't be modified while channel is still captured
sl@0: 		return KErrAccessDenied;
sl@0: 
sl@0: 	TInt retVal = KErrNone;
sl@0: 	TInt trigger = aTrigger;
sl@0: 	switch (iTimerState)	// Handle existing timer conditions
sl@0: 		{
sl@0: 		case DIicBusChannelSlave::EInactive:
sl@0: 			{
sl@0: 			// In this state no timers have been started - so no action required
sl@0: 			break;
sl@0: 			}
sl@0: 		case DIicBusChannelSlave::EWaitForClient:
sl@0: 			{
sl@0: 			// Client has responded within the given time period, so stop the timer.
sl@0: 			StopTimer();
sl@0: 			break;
sl@0: 			}
sl@0: 		case DIicBusChannelSlave::EWaitForMaster:
sl@0: 			{
sl@0: 			// If both Rx and Tx events had been requested, and if ERxOverrun had occurred, the Client
sl@0: 			// may have called this function with new requests for Rx notifications, in order to
sl@0: 			// continue reading data sent by the Master. At this point, all Rx request flags in iReqTrig
sl@0: 			// will have been cleared.
sl@0: 			// If both Rx and Tx events had been requested, and if ETxUnderrun had occurred, the Client
sl@0: 			// may have called this function with new requests for Tx notifications, in order to
sl@0: 			// continue sending data to the Master. At this point, all Tx request flags in iReqTrig will
sl@0: 			// have been cleared.
sl@0: 			//
sl@0: 			// To handle the ERxOverrun situation, aTrigger may specify only the new Rx trigger settings,
sl@0: 			// or it may also re-specify the exisiting Tx settings. Similarly for the ETxUnderrun, aTrigger
sl@0: 			// may specify only the new Tx triggers, or both the new Tx triggers and the existing Rx triggers.
sl@0: 			//
sl@0: 			// However, if Rx flags are still set in iReqTrig, a request to change the Rx settings
sl@0: 			// will be rejected (similarly, for Tx).
sl@0: 			//
sl@0: 			// If the requested notification is zero, which would represent an attempt to clear all triggers
sl@0: 			// while the Master may have commenced a transfer, the request will be rejected.
sl@0: 			__ASSERT_DEBUG(iReqTrig != 0, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 			if(trigger == 0)
sl@0: 				{
sl@0: 				return KErrInUse;
sl@0: 				}
sl@0: 			TInt allRxFlags = ERxAllBytes | ERxOverrun | ERxUnderrun;
sl@0: 			TInt allTxFlags = ETxAllBytes | ETxOverrun | ETxUnderrun;
sl@0: 			// Check the Rx flags
sl@0: 			TInt rxTrig = iReqTrig & allRxFlags;
sl@0: 			TInt reqRxTrig = trigger & allRxFlags;
sl@0: 			if(rxTrig == 0)
sl@0: 				{
sl@0: 				rxTrig = reqRxTrig;
sl@0: 				}
sl@0: 			else if(reqRxTrig != 0)
sl@0: 				{
sl@0: 				// New Rx triggers specified - check that Client is not attempting to modify the existing
sl@0: 				// settings
sl@0: 				if(rxTrig ^ reqRxTrig)
sl@0: 					{
sl@0: 					// Attempting to change the trigger settings - so reject the request
sl@0: 					return KErrInUse;
sl@0: 					}
sl@0: 				}
sl@0: 			// Check the Tx flags
sl@0: 			TInt txTrig = iReqTrig & allTxFlags;
sl@0: 			TInt reqTxTrig = trigger & allTxFlags;
sl@0: 			if(txTrig == 0)
sl@0: 				{
sl@0: 				txTrig = reqTxTrig;
sl@0: 				}
sl@0: 			else if(reqTxTrig != 0)
sl@0: 				{
sl@0: 				// New Tx triggers specified - check that Client is not attempting to modify the existing
sl@0: 				// settings
sl@0: 				if(txTrig ^ reqTxTrig)
sl@0: 					{
sl@0: 					// Attempting to change the trigger settings - so reject the request
sl@0: 					return KErrInUse;
sl@0: 					}
sl@0: 				}
sl@0: 			// Udate iReqTrig for the new requested trigger
sl@0: 			// and cancel the timer - since we are now starting a new transfer, we should
sl@0: 			// allow the Master the time to perform it
sl@0: 			trigger = rxTrig | txTrig;
sl@0: 			StopTimer();
sl@0: 			break;
sl@0: 			}
sl@0: 		case DIicBusChannelSlave::EClientTimeout:
sl@0: 			{
sl@0: 			// The Client did not respond within the expected time for the previous transfer. As a result,
sl@0: 			// the transaction will have been terminated for the Client.
sl@0: 			// Set the return value to inform the Client that it previously exceeded the expected response time
sl@0: 			retVal = KErrTimedOut;
sl@0: 			break;
sl@0: 			}
sl@0: 		default:
sl@0: 			{
sl@0: 			__ASSERT_DEBUG(0, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 			break;
sl@0: 			}
sl@0: 		}
sl@0: 	// Ensure that requests for notification of asynchronous capture of channel is removed, since this
sl@0: 	// is not a valid event to request (the channel will already have been captured to get this far).
sl@0: 	// Also ensure that requests for EGeneralBusError are removed, since they are redundant (a notification
sl@0: 	// for a bus error is unconditional) and just represent overhead.
sl@0: 	trigger &= ~(EAsyncCaptChan | EGeneralBusError);
sl@0: 
sl@0: 	iReqTrig = (TInt8)trigger; 				// Not atomic access since only client thread modifies iReqTrig
sl@0: 	iAccumTrig = 0;						// New transfer, so initialise accumulated event record
sl@0: 	TInt reqFlags=0;
sl@0: 	// Overrun and/or underrun may be requested if Client is unsure how much data is to follow,
sl@0: 	// so need to instigate Rx/Tx operation for any such request
sl@0: 	if(iReqTrig & (ERxOverrun|ERxUnderrun|ERxAllBytes))
sl@0: 		{
sl@0: 		reqFlags |= EReceive;
sl@0: 		}
sl@0: 	if(iReqTrig & (ETxOverrun|ETxUnderrun|ETxAllBytes))
sl@0: 		{
sl@0: 		reqFlags |= ETransmit;
sl@0: 		}
sl@0: 	TInt r = DoRequest(reqFlags);
sl@0: 	if(r != KErrNone)
sl@0: 		{
sl@0: 		// PSL encountered an error in intiating the requested trigger. Set the return value accordingly.
sl@0: 		// Assume triggers have been cancelled - if they have not, the client-provided callback will still
sl@0: 		// be invoked, but it will have been warned to expecte erroneous behaviour by the value assigned to retVal.
sl@0: 		iReqTrig = 0;
sl@0: 		retVal = KErrGeneral;
sl@0: 		}
sl@0: 	else	// PSL accepted the request, so update timer and state information
sl@0: 		{
sl@0: 		switch (iTimerState)
sl@0: 			{
sl@0: 			case DIicBusChannelSlave::EInactive:
sl@0: 				{
sl@0: 				// Do not start the timer. Must wait for the Master to access a Slave buffer before considering
sl@0: 				// a transaction as started.
sl@0: 				break;
sl@0: 				}
sl@0: 			case DIicBusChannelSlave::EWaitForClient:
sl@0: 				{
sl@0: 				// Client has responded within the given time period. The next state is
sl@0: 				// dependent on the requested trigger - if set to zero, the Client is explicitly
sl@0: 				// ending the transaction, so the next state is EInactive; otherwise, the
sl@0: 				// Client has indicated the next action expected from the Master and so the
sl@0: 				// timer is started and next state is EWaitForMaster
sl@0: 				if(iReqTrig == 0)
sl@0: 					{
sl@0: 					iTimerState = DIicBusChannelSlave::EInactive;
sl@0: 					}
sl@0: 				else
sl@0: 					{
sl@0: 					iTimerState = DIicBusChannelSlave::EWaitForMaster;
sl@0: 					StartTimerByState();
sl@0: 					}
sl@0: 				break;
sl@0: 				}
sl@0: 			case DIicBusChannelSlave::EClientTimeout:
sl@0: 				{
sl@0: 				// For the previous transfer, the Client failed to respond within the required time - and
sl@0: 				// the PSL will have been instructed to indicate a bus error (so the Master
sl@0: 				// will have been informed). The error code returned by this function will be KErrTimedOut
sl@0: 				// so the Client will be informed of what has happened.
sl@0: 				// A transaction is considered to start when the Slave is addressed by the Master
sl@0: 				// (as indicated by the PSL invoking NotifyClient) - which has not yet happened -
sl@0: 				// so the next state is EInactive.
sl@0: 				iTimerState=DIicBusChannelSlave::EInactive;
sl@0: 				break;
sl@0: 				}
sl@0: 			case DIicBusChannelSlave::EWaitForMaster:
sl@0: 				{
sl@0: 				// In this case we are handling a new requested trigger from the client to handle ERxOverrun or
sl@0: 				// ETxUnderrun. The PSL has accepted the new trigger, so must allow the Master sufficient time
sl@0: 				// to perform the newly-requested transfer; the timer has already been stopped, so just start it again..
sl@0: 				StartTimerByState();
sl@0: 				break;
sl@0: 				}
sl@0: 			default:
sl@0: 				{
sl@0: 				__ASSERT_DEBUG(0, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 				break;
sl@0: 				}
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	return retVal;
sl@0: 	}
sl@0: #else /*SLAVE_MODE*/
sl@0: 
sl@0: TInt DIicBusChannelSlave::CaptureChannel(TDes8* /*aConfigHdr*/, TIicBusSlaveCallback* /*aCallback*/, TInt& /*aChannelId*/, TBool /*aAsynch*/)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::CaptureChannel invoked when not in SLAVE_MODE!\n"));
sl@0: 	 return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::ReleaseChannel()
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::ReleaseChannel invoked when not in SLAVE_MODE!\n"));
sl@0: 	 return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::RegisterRxBuffer(TPtr8 /*aRxBuffer*/, TInt8 /*aBufGranularity*/, TInt8 /*aNumWords*/, TInt8 /*aOffset*/)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::RegisterRxBuffer invoked when not in SLAVE_MODE!\n"));
sl@0: 	 return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::RegisterTxBuffer(TPtr8 /*aTxBuffer*/, TInt8 /*aBufGranularity*/, TInt8 /*aNumWords*/, TInt8 /*aOffset*/)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::RegisterTxBuffer invoked when not in SLAVE_MODE!\n"));
sl@0: 	 return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::SetNotificationTrigger(TInt /*aTrigger*/)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::SetNotificationTrigger invoked when not in SLAVE_MODE!\n"));
sl@0: 	 return KErrNotSupported;
sl@0: 	}
sl@0: #endif/*SLAVE_MODE*/
sl@0: 
sl@0: DIicBusChannelSlave::DIicBusChannelSlave(TBusType aBusType, TChannelDuplex aChanDuplex, TInt16 aChannelId)
sl@0: 	: DIicBusChannel(DIicBusChannel::ESlave, aBusType, aChanDuplex),
sl@0: 	iChannelId(aChannelId), iTimerState(EInactive),
sl@0: 	iMasterWaitTime(KSlaveDefMWaitTime), iClientWaitTime(KSlaveDefCWaitTime),
sl@0: 	iSpinLock(TSpinLock::EOrderGenericIrqLow2)  // Semi-arbitrary, low priority value
sl@0: 	{
sl@0: #ifndef STANDALONE_CHANNEL
sl@0: 	iController = NULL;
sl@0: #endif
sl@0: 	}
sl@0: 
sl@0: DIicBusChannelSlave::~DIicBusChannelSlave()
sl@0:     {
sl@0:     delete iClientTimeoutDfc;
sl@0:     }
sl@0: 
sl@0: void DIicBusChannelSlave::SlaveStaticCB(TAny* aPtr)
sl@0: 	{
sl@0: 	DIicBusChannelSlave* chan = (DIicBusChannelSlave*)aPtr;
sl@0: 	chan->SlaveTimerCallBack();
sl@0: 	return;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::Init()
sl@0: 	{
sl@0: 	iClientTimeoutDfc = new TDfc(SlaveStaticCB,(TAny*)this, 7);	// Highest Dfc priority
sl@0: 	if(!iClientTimeoutDfc)
sl@0: 		return KErrNoMemory;
sl@0: 	else
sl@0: 		return KErrNone;
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelSlave::ChanCaptureCallback(TInt aResult)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("ChanCaptureCallback: aChannel=0x%x, aResult=%d\n",this,aResult));
sl@0: 
sl@0: 	TInt r=aResult;
sl@0: 	TInt channelId = 0;
sl@0: 	if(aResult == KErrNone)
sl@0: 		{
sl@0: 		SetChannelId(channelId);
sl@0: #ifndef STANDALONE_CHANNEL
sl@0: 		__ASSERT_DEBUG(iController, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 		iController->InstallCapturedChannel(channelId, this);
sl@0: #endif
sl@0: 		iClientTimeoutDfc->SetDfcQ(iNotif->iDfcQ);
sl@0: 		r=KErrCompletion;
sl@0: 		}
sl@0: 	else
sl@0: 		ReleaseChannel();
sl@0: 
sl@0: #ifdef IIC_INSTRUMENTATION_MACRO
sl@0: 	IIC_SCAPTCHANASYNC_END_PIL_TRACE;
sl@0: #endif
sl@0: 	CompleteAsynchCapture(r);	// Queue the client callback for execution
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelSlave::SlaveTimerCallBack()
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("SlaveTimerCallBack"));
sl@0: 	if(iTimerState == DIicBusChannelSlave::EWaitForMaster)
sl@0: 		{
sl@0: 		// Master timeout. Consider the transaction terminated - call NotifyClient
sl@0: 		// to inform both the Client and the PSL, and update the state machine
sl@0: 		NotifyClient(EGeneralBusError);
sl@0: 		}
sl@0: 	else if(iTimerState == DIicBusChannelSlave::EWaitForClient)
sl@0: 		{
sl@0: 		// Client timeout. Instigate the PSL-specific bus error indication
sl@0: 		iTimerState=DIicBusChannelSlave::EClientTimeout;
sl@0: 		SendBusErrorAndReturn();
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		__ASSERT_DEBUG(0, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void DIicBusChannelSlave::StartTimerByState()
sl@0: 	{
sl@0: 	if(iTimerState == DIicBusChannelSlave::EWaitForMaster)
sl@0: 		{
sl@0: 		iTimeoutTimer.OneShot(NKern::TimerTicks(iMasterWaitTime),(*iClientTimeoutDfc));
sl@0: 		}
sl@0: 	else if(iTimerState == DIicBusChannelSlave::EWaitForClient)
sl@0: 		{
sl@0: 		iTimeoutTimer.OneShot(NKern::TimerTicks(iClientWaitTime),(*iClientTimeoutDfc));
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		__ASSERT_DEBUG(NULL, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelSlave::StopTimer()
sl@0: 	{
sl@0: 	iTimeoutTimer.Cancel();
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::UpdateReqTrig(TInt8& aCbTrigVal, TInt& aCallbackRet)
sl@0: 	{
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("UpdateReqTrig"));
sl@0: 
sl@0: 	TInt nextSteps = 0;
sl@0: 	iAccumTrig |= iNotif->iTrigger;	// Update the accumulated event history, regardless of if the trigger was requested
sl@0: 
sl@0: 	if(iNotif->iTrigger & EGeneralBusError)
sl@0: 		{
sl@0: 		// In the event of a bus error, always cancel the timer and call the Client callback
sl@0: 		nextSteps |= (EStopTimer | EInvokeCb);
sl@0: 		iTimerState = EInactive;
sl@0: 		aCallbackRet = KErrGeneral;
sl@0: 		}
sl@0: 	else if(iNotif->iTrigger == EAsyncCaptChan)
sl@0: 		{
sl@0: 		// For asynchronous channel capture, no timers are involved - just call the Client callback
sl@0: 		nextSteps |= EInvokeCb;
sl@0: 		aCallbackRet = KErrCompletion;
sl@0: 		}
sl@0: 	else if((iNotif->iTrigger & iReqTrig) != 0)
sl@0: 		{
sl@0: 		// If a requested Rx event has occurred, clear all Rx flags from the requested triggers (similarly for Tx)
sl@0: 		if(iNotif->iTrigger & (ERxAllBytes | ERxUnderrun | ERxOverrun))
sl@0: 			{
sl@0: 			iReqTrig &= ~(ERxAllBytes | ERxUnderrun | ERxOverrun);
sl@0: 			}
sl@0: 		if(iNotif->iTrigger & (ETxAllBytes | ETxUnderrun | ETxOverrun))
sl@0: 			{
sl@0: 			iReqTrig &= ~(ETxAllBytes | ETxUnderrun | ETxOverrun);
sl@0: 			}
sl@0: 
sl@0: 		if(iTimerState == EInactive)
sl@0: 			{
sl@0: 			nextSteps |= (EStartTimer | EInvokeCb);
sl@0: 			// The next state in the state machine depends on if all the requested events have occurred
sl@0: 			if(iReqTrig == 0)
sl@0: 				{
sl@0: 				// All triggers required have occurred, so transition to state EWaitForClient
sl@0: 				iTimerState = EWaitForClient;
sl@0: 				}
sl@0: 			else
sl@0: 				{
sl@0: 				// The Client can request both Rx an Tx triggers; if only one has occurred, must wait for
sl@0: 				// the Master to generate the other
sl@0: 				iTimerState = EWaitForMaster;
sl@0: 				}
sl@0: 			aCallbackRet = KErrNone;
sl@0: 			}
sl@0: 		else if(iTimerState == EWaitForMaster)
sl@0: 			{
sl@0: 			// The next state in the state machine depends on if all the requested events have occurred
sl@0: 			if(iReqTrig == 0)
sl@0: 				{
sl@0: 				// All triggers required have occurred, so transition to state EWaitForClient
sl@0: 				iTimerState = EWaitForClient;
sl@0: 				nextSteps |= (EStopTimer | EInvokeCb | EStartTimer);
sl@0: 				}
sl@0: 			else
sl@0: 				{
sl@0: 				// The Client can request both Rx an Tx triggers; if only one has occurred, must wait for
sl@0: 				// the Master to generate the other - so remain in this state, do not cancel the timer or
sl@0: 				// re-start it with a new timeout period. Still invoke the callback to notify the client
sl@0: 				// that at least one of the requested triggers has occurred.
sl@0: 				nextSteps |= EInvokeCb;
sl@0: 				}
sl@0: 			aCallbackRet = KErrNone;
sl@0: 			}
sl@0: 		else if((iTimerState == EWaitForClient) || (iTimerState == EClientTimeout))
sl@0: 			{
sl@0: 			// No triggers are expected in these states (iReqTrig==0).
sl@0: 			__ASSERT_DEBUG(NULL, Kern::Fault(KIicChannelPanic,__LINE__));
sl@0: 			}
sl@0: 		}
sl@0: 	aCbTrigVal = iAccumTrig;
sl@0: 	return nextSteps;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: void DIicBusChannelSlave::NotifyClient(TInt aTrigger)
sl@0: 	{
sl@0: 	TIicBusSlaveCallback* notif = iNotif;
sl@0: 	notif->iTrigger = aTrigger;	// Ensure ProcessData is provided with the trigger
sl@0: 
sl@0: 	if(NKern::CurrentContext() == NKern::EThread && &(Kern::CurrentThread()) == iClient)
sl@0: 		{
sl@0: 		// PSL will update notif to represent the events that have occurred
sl@0: 		ProcessData(aTrigger, notif);
sl@0: 		// Only invoke the client's callback (and update the state machine) if one of the requested triggers has
sl@0: 		// occurred or if a bus error has been witnessed
sl@0: 		TInt8 callbackTrig=0;
sl@0: 		TInt callbackRet=0;
sl@0: 		TInt nextSteps = UpdateReqTrig(callbackTrig, callbackRet);
sl@0: 		if(nextSteps & EStopTimer)
sl@0: 			{
sl@0: 			iTimeoutTimer.Cancel();
sl@0: 			}
sl@0: 		if(nextSteps & EInvokeCb)
sl@0: 			{
sl@0: 			(notif->iCallback)(notif->iChannelId, (TInt)callbackRet, callbackTrig, notif->iRxWords, notif->iTxWords, notif->iParam);
sl@0: 			// Callback now processed, so re-initialise callback object members
sl@0: 			notif->iTrigger=0;
sl@0: 			notif->iReturn=KErrNone;
sl@0: 			notif->iRxWords=0;
sl@0: 			notif->iTxWords=0;
sl@0: 			iAccumTrig = 0;	// and re-initialise the accumulated history as the transaction is considered terminated
sl@0: 			}
sl@0: 		if(nextSteps & EStartTimer)
sl@0: 			{
sl@0: 			StartTimerByState();
sl@0: 			}
sl@0: 		}
sl@0: 	else if(NKern::CurrentContext() == NKern::EInterrupt)
sl@0: 			notif->Add();
sl@0: 	else
sl@0: 		notif->Enque();
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::SetMasterWaitTime(TInt8 aWaitTime)
sl@0: 	{
sl@0: 	if((aWaitTime<0)||(aWaitTime>KMaxWaitTime))
sl@0: 		return KErrArgument;
sl@0: 	iMasterWaitTime=aWaitTime;
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::SetClientWaitTime(TInt8 aWaitTime)
sl@0: 	{
sl@0: 	if((aWaitTime<0)||(aWaitTime>KMaxWaitTime))
sl@0: 		return KErrArgument;
sl@0: 	iClientWaitTime=aWaitTime;
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelSlave::SendBusErrorAndReturn()
sl@0: 	{
sl@0: 	DoRequest(EAbort);
sl@0: 	}
sl@0: 
sl@0: void DIicBusChannelSlave::SetChannelId(TInt& aChannelId)
sl@0:     {
sl@0:     ++iInstanceCount;
sl@0:     aChannelId = (iInstanceCount<<16);
sl@0:     //
sl@0:     // The PSL-specific channel identifier was stored in this generic class' member iChannelId at registration time
sl@0:     aChannelId |= iChannelId;
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::SetChannelId: iInstanceCount=0x%x, iChannelId=0x%x returned aChannelId=0x%x\n",iInstanceCount,iChannelId,aChannelId));
sl@0:     iNotif->iChannelId=aChannelId;
sl@0:     }
sl@0: 
sl@0: void DIicBusChannelSlave::CompleteAsynchCapture(TInt aResult)
sl@0:     {
sl@0:     __KTRACE_OPT(KIIC, Kern::Printf("DIicBusChannelSlave::CompleteAsynchCapture aResult = %d",aResult));
sl@0:     if(NKern::CurrentContext() == NKern::EThread && &Kern::CurrentThread() == iClient)
sl@0:         {
sl@0:         iNotif->iCallback(iNotif->iChannelId, aResult, EAsyncCaptChan, NULL, NULL, iNotif->iParam);
sl@0:         return;
sl@0:         }
sl@0:     else
sl@0:         {
sl@0:         iNotif->iReturn=aResult;
sl@0:         iNotif->iTrigger=EAsyncCaptChan;
sl@0:         iNotif->iTxWords=NULL;
sl@0:         iNotif->iRxWords=NULL;
sl@0:         }
sl@0:     if(NKern::CurrentContext() == NKern::EInterrupt)
sl@0:         iNotif->Add();
sl@0:     else
sl@0:         iNotif->Enque();
sl@0:     }
sl@0: 
sl@0: TInt DIicBusChannelSlave::StaticExtension(TUint /*aFunction*/, TAny* /*aParam1*/, TAny* /*aParam*/)
sl@0:  	{
sl@0:  	return KErrNotSupported;
sl@0:  	}
sl@0: 
sl@0: TInt DIicBusChannelSlave::Spare1(TInt /*aVal*/, TAny* /*aPtr1*/, TAny* /*aPtr2*/)
sl@0: 	{
sl@0: 	return KErrNotSupported;
sl@0: 	}
sl@0: 
sl@0: TInt DIicBusChannelMasterSlave::QueueTransaction(TIicBusTransaction* aTransaction)
sl@0: 	{
sl@0: 	return QueueTransaction(aTransaction,NULL);
sl@0: 	};
sl@0: 
sl@0: TInt DIicBusChannelMasterSlave::QueueTransaction(TIicBusTransaction* aTransaction, TIicBusCallback* aCallback)
sl@0: 	{
sl@0: 	TInt r=KErrNone;
sl@0: 	iMasterChannel->Lock();
sl@0: 	if(iSlaveChannel->iChannelInUse)
sl@0: 		r=KErrInUse;
sl@0: 	else
sl@0: 		{
sl@0: 		TInt16 count=(TInt16)((iMasterChannel->iTransCount)&~KTransCountMsBit);
sl@0: 		if(count<~KTransCountMsBit)
sl@0: 			{
sl@0: 			++count;
sl@0: 			count|=KTransCountMsBit;
sl@0: 			}
sl@0: 		else
sl@0: 			r=KErrInUse;
sl@0: 		}
sl@0: 	iMasterChannel->Unlock();
sl@0: 	if(r == KErrNone)
sl@0: 		r=(iMasterChannel->QueueTransaction(aTransaction, aCallback));
sl@0: 	return r;
sl@0: 	};
sl@0: 
sl@0: TInt DIicBusChannelMasterSlave::CaptureChannel(TDes8* aConfigHdr, TIicBusSlaveCallback* aCallback, TInt& aChannelId, TBool aAsynch)
sl@0: 	{
sl@0: 	iMasterChannel->Lock();
sl@0: 	TInt r=KErrNone;
sl@0: 	if(iSlaveChannel->iChannelInUse)
sl@0: 		r=KErrInUse;
sl@0: 	else
sl@0: 		{
sl@0: 		if(iMasterChannel->IsMasterBusy())
sl@0: 			r=KErrInUse;
sl@0: 		else
sl@0: 			iSlaveChannel->iChannelInUse = 1;
sl@0: 		}
sl@0: 	iMasterChannel->Unlock();
sl@0: 	if(r == KErrNone)
sl@0: 		r=iSlaveChannel->CaptureChannel(aConfigHdr, aCallback, aChannelId, aAsynch);
sl@0: 	return r;
sl@0: 	};
sl@0: 
sl@0: 
sl@0: TInt DIicBusChannelMasterSlave::ReleaseChannel()
sl@0:     {
sl@0: 	iMasterChannel->Lock();
sl@0: 	TInt r=iSlaveChannel->ReleaseChannel();
sl@0: 	iMasterChannel->Unlock();
sl@0: 	return r;
sl@0: 	};
sl@0: 
sl@0: TInt DIicBusChannelMasterSlave::StaticExtension(TUint /*aFunction*/, TAny* /*aParam1*/, TAny* /*aParam*/)
sl@0:  	{
sl@0:  	return KErrNotSupported;
sl@0:  	}
sl@0: 
sl@0: #ifdef STANDALONE_CHANNEL
sl@0: EXPORT_C DIicBusChannelMasterSlave::DIicBusChannelMasterSlave(TBusType aBusType, TChannelDuplex aChanDuplex, DIicBusChannelMaster* aMasterChan, DIicBusChannelSlave* aSlaveChan)
sl@0:     : DIicBusChannel(DIicBusChannel::EMasterSlave, aBusType, aChanDuplex),
sl@0:     iMasterChannel(aMasterChan),
sl@0:     iSlaveChannel(aSlaveChan)
sl@0:     {
sl@0:     //If in stand-alone channel mode, the client assigns a channel number to the MasterSlave channel it creates.
sl@0:     }
sl@0: #endif
sl@0: