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/*
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Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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All rights reserved.
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This program and the accompanying materials are made available
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under the terms of the Eclipse Public License v1.0 which accompanies
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this distribution, and is available at
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http://www.eclipse.org/legal/epl-v10.html
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Initial Contributors:
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Nokia Corporation - initial contribution.
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Contributors:
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*/
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#include "controltransfersm.h"
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// Bitmap of setup packet
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/*
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Offset 0, bmRequestType, 1 bytes
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1 Bit-Map
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D7 Data Phase Transfer Direction
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0 = Host to Device
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1 = Device to Host
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D6..5 Type
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0 = Standard
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1 = Class
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2 = Vendor
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3 = Reserved
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D4..0 Recipient
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0 = Device
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1 = Interface
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2 = Endpoint
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3 = Other
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4..31 = Reserved
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Offset 1, bRequest
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Offset 6, Count, 2 bytes
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Number of bytes to transfer if there is a data phase
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*/
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#if defined(_DEBUG)
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#define CTSM_ID "ControlTransferSM "
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char* DebugName[] =
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{
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"Setup",
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"Data Out",
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"Status In",
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"Data In",
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"Status Out"
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};
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#endif
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// Static data instance
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TUsbcSetup TSetupPkgParser::iSetupPkt;
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TSetupPkgParser::TSetupPkgParser()
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{
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iSetupPkt.iRequestType = 0;
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iSetupPkt.iRequest = 0;
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iSetupPkt.iValue = 0;
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iSetupPkt.iIndex = 0;
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iSetupPkt.iLength = 0;
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}
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// Code for TSetupPkgParser
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// we do a bitwise copy here.
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void TSetupPkgParser::Set(const TUint8* aSetupBuf)
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{
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// TUint8 index
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iSetupPkt.iRequestType = static_cast<const TUint8*>(aSetupBuf)[0];
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iSetupPkt.iRequest = static_cast<const TUint8*>(aSetupBuf)[1];
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// TUint16 index from here!
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iSetupPkt.iValue = SWAP_BYTES_16((reinterpret_cast<const TUint16*>(aSetupBuf))[1]);
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iSetupPkt.iIndex = SWAP_BYTES_16((reinterpret_cast<const TUint16*>(aSetupBuf))[2]);
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iSetupPkt.iLength = SWAP_BYTES_16((reinterpret_cast<const TUint16*>(aSetupBuf))[3]);
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "TSetupPkgParser::Set"));
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}
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// return the next stage by decoding the setup packet
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// the possible stage followed by a setup packet are:
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// StatusIn (no data stage)
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// DataOut (host sent to peripheral)
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// DataIn (peripheral to host)
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UsbShai::TControlStage TSetupPkgParser::NextStage()
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{
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UsbShai::TControlStage ret = UsbShai::EControlTransferStageMax;
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// Take the data length out, 0 length means no data stage
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if (iSetupPkt.iLength == 0)
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{
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ret = UsbShai::EControlTransferStageStatusIn;
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}
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else if ((iSetupPkt.iRequestType & KUsbRequestType_DirMask) == KUsbRequestType_DirToDev)
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{
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// Dir to device means host will send data out
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ret = UsbShai::EControlTransferStageDataOut;
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}
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else
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{
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// Otherwise, there must be a datain stage follows
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ret = UsbShai::EControlTransferStageDataIn;
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}
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "TSetupPkgParser::NextStage %d", ret));
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return ret;
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}
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// Base class of stage sm
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TControlStageSm::TControlStageSm(DControlTransferManager& aTransferMgr):
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iTransferMgr(aTransferMgr)
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{
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}
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void TControlStageSm::ChangeToStage(UsbShai::TControlStage aToStage)
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "<> TControlStageSm::ChangeToStage: %s",DebugName[aToStage]));
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iTransferMgr.iCurrentStage = aToStage;
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}
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void TControlStageSm::ClearPendingRead()
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{
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iTransferMgr.iReadPending = EFalse;
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}
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// Code for DControlTransferManager
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//
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DControlTransferManager::DControlTransferManager(MControlTransferIf& aCtrTransIf):
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iCtrTransferIf(aCtrTransIf)
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{
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for(int i=0; i<UsbShai::EControlTransferStageMax; i++)
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{
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iState[i] = NULL;
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}
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Reset();
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}
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TInt DControlTransferManager::SetupEndpointZeroRead()
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{
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if(iState[iCurrentStage]->IsRequstAllowed(TControlTransferRequestRead))
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{
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if(!iReadPending)
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{
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iReadPending = ETrue;
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return CtrTransferIf().ProcessSetupEndpointZeroRead();
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}
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else
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{
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// A read operation already on going, ignore this request
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return KErrNone;
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}
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}
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else
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID " !! SetupEndpointZeroRead discard"));
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return KErrNotReady;
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}
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}
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TInt DControlTransferManager::SetupEndpointZeroWrite(const TUint8* aBuffer, TInt aLength, TBool aZlpReqd)
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{
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if(iState[iCurrentStage]->IsRequstAllowed(TControlTransferRequestWrite))
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{
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return CtrTransferIf().ProcessSetupEndpointZeroWrite(aBuffer,aLength,aZlpReqd);
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}
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else
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID " !! SetupEndpointZeroWrite discard"));
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return KErrNotReady;
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}
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}
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TInt DControlTransferManager::SendEp0ZeroByteStatusPacket()
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{
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if(iState[iCurrentStage]->IsRequstAllowed(TControlTransferRequestSendStatus))
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{
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iCurrentStage = UsbShai::EControlTransferStageSetup;
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return CtrTransferIf().ProcessSendEp0ZeroByteStatusPacket();
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}
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else
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID " !! SendEp0ZeroByteStatusPacket discard"));
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return KErrNotReady;
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}
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}
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TInt DControlTransferManager::StallEndpoint(TInt aRealEndpoint)
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{
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// Endpoint is stalled, we need to reset our state machine.
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Reset();
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return CtrTransferIf().ProcessStallEndpoint(aRealEndpoint);
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}
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void DControlTransferManager::Ep0SetupPacketProceed()
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID " !! Missed setup packet processed"));
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CtrTransferIf().ProcessEp0SetupPacketProceed();
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}
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void DControlTransferManager::Ep0DataPacketProceed()
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID " !! Missed data packet processed"));
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CtrTransferIf().ProcessEp0DataPacketProceed();
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}
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void DControlTransferManager::Reset()
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{
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iCurrentStage = UsbShai::EControlTransferStageSetup;
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iReadPending = EFalse;
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}
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void DControlTransferManager::Ep0RequestComplete(TUint8* aBuf,
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TInt aCount,
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TInt aError,
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UsbShai::TControlPacketType aPktType)
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "> DControlTransferManager::Ep0RequestComplete, packet type: %s", DebugName[aPktType]));
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// If a setup packet comes, update our local setup packet buffer first
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if(aPktType == UsbShai::EControlPacketTypeSetup)
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{
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iPacketParser.Set(aBuf);
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// This is the only place this variable to be reset.
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iDataTransfered = 0;
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}
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// RequestComplete will return ETrue if it can not handle a packet
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// And it knows that some other sm can handle it.
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// It will update the state to the one which can hanlde that packet first.
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TBool furtherProcessNeeded = ETrue;
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while(furtherProcessNeeded)
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{
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__KTRACE_OPT(KUSB, Kern::Printf(" We're at Stage: %s", DebugName[iCurrentStage]));
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furtherProcessNeeded = iState[iCurrentStage]->RequestComplete(aCount,aError,aPktType);
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__KTRACE_OPT(KUSB, Kern::Printf(" We're moved to stage: %s", DebugName[iCurrentStage]));
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}
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "< DControlTransferManager::Ep0RequestComplete"));
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}
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// setup the state machine for a state
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void DControlTransferManager::AddState(UsbShai::TControlStage aStage,TControlStageSm& aStageSm)
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{
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if( (aStage >= UsbShai::EControlTransferStageSetup) && (aStage < UsbShai::EControlTransferStageMax))
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID " AddState(), Stage: %s", DebugName[aStage]));
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iState[aStage] = &aStageSm;
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}
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}
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// *************** Code for SETUP state machines **************************************
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//
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DSetupStageSm::DSetupStageSm(DControlTransferManager& aTransferMgr):
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TControlStageSm(aTransferMgr)
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{
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}
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// WE are waiting a SETUP packet
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TBool DSetupStageSm::RequestComplete(TInt aPktSize, TInt aError, UsbShai::TControlPacketType aPktType)
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{
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TBool ret = EFalse;
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "DSetupStageSm::RequestComplete"));
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if(aPktType != UsbShai::EControlPacketTypeSetup)
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{
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// we just discard any non-setup packet
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DSetupStageSm - Non-Setup recieved"));
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return ret;
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}
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// change state to whatever returned from this call.
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ChangeToStage(iTransferMgr.PktParser().NextStage());
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// We're going to complete User's read request, consume the previous
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// read operation
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ClearPendingRead();
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// Setup packet are always need to be processed
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iTransferMgr.CtrTransferIf().ProcessSetupPacket(aPktSize,aError);
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return EFalse;
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}
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TBool DSetupStageSm::IsRequstAllowed(TControlTransferRequest aRequest)
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{
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// Allow user to read, No other operation is allowed
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TBool ret = (aRequest == TControlTransferRequestRead)?ETrue:EFalse;
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if( ! ret)
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "Warning: request %d was blocked at DSetupStageSm",aRequest));
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}
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return ret;
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}
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// *************** Code for DATA IN state machines **************************************
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DDataInStageSm::DDataInStageSm(DControlTransferManager& aTransferMgr):
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TControlStageSm(aTransferMgr)
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{
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}
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// We are waiting for a competion of DATA IN packet
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TBool DDataInStageSm::RequestComplete(TInt aPktSize, TInt aError, UsbShai::TControlPacketType aPktType)
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{
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TInt completionCode = aError;
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TBool furtherRequest = EFalse;
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switch(aPktType)
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{
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case UsbShai::EControlPacketTypeSetup:
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DDataInStageSm - Setup recieved"));
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// Something goes wrong, host is abandoning the unfinished control transfer
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completionCode = KErrGeneral;
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// Force SM restart at setup stage
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ChangeToStage(UsbShai::EControlTransferStageSetup);
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// this packet is partially processed here
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// need another SM to continue
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furtherRequest = ETrue;
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}
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break;
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case UsbShai::EControlPacketTypeDataIn:
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{
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// PSL notifing us that the data had been sent to host
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// next step is to wait for the status from Host
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ChangeToStage(UsbShai::EControlTransferStageStatusOut);
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// In USB spec, a compete control transfer must inclue a status stage
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// which is not case in reality,some PSL/Hardware will swallow the
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// Status out report, so, we just complete client normally.
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}
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break;
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default:
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DDataInStageSm - %s recieved",DebugName[aPktType]));
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// Unexpected packet will be discard, and lead us reset state machine
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// so that we can wait for next SETUP packet.
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// Of course error will be report to any client if any there.
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ChangeToStage(UsbShai::EControlTransferStageSetup);
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completionCode = KErrGeneral;
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}
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break;
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}
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iTransferMgr.CtrTransferIf().ProcessDataInPacket(aPktSize,completionCode);
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return furtherRequest;
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}
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TBool DDataInStageSm::IsRequstAllowed(TControlTransferRequest aRequest)
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{
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// Only write is possible because host is waiting for data from us
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TBool ret = (aRequest == TControlTransferRequestWrite)?ETrue:EFalse;
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if( ! ret)
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "Warning: request %d was blocked at DDataInStageSm",aRequest));
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}
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return ret;
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};
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// *************** Code for STATUS OUT state machines **************************************
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DStatusOutStageSm::DStatusOutStageSm(DControlTransferManager& aTransferMgr):
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TControlStageSm(aTransferMgr)
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{
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}
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// We are waiting for a competion of STATUS OUT or a SETUP packet if PSL or hardware don't
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// complete a status in packet
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TBool DStatusOutStageSm::RequestComplete(TInt aPktSize, TInt aError, UsbShai::TControlPacketType aPktType)
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{
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TBool furtherRequest = EFalse;
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TInt completionCode = aError;
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switch(aPktType)
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{
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case UsbShai::EControlPacketTypeSetup:
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{
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__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DStatusOutStageSm - Setup recieved"));
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// hw or PSL may not send back the status packet for a DATA OUT
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// and we're ok for this, just back to EControlTransferStageSetup stage
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// Force SM restart at setup stage
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ChangeToStage(UsbShai::EControlTransferStageSetup);
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// this packet is partially processed here
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// need another SM to continue
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furtherRequest = ETrue;
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}
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break;
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case UsbShai::EControlPacketTypeStatusOut:
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{
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// Force SM restart at setup stage
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ChangeToStage(UsbShai::EControlTransferStageSetup);
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}
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break;
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default:
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{
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|
421 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DStatusOutStageSm - %s recieved",DebugName[aPktType]));
|
|
422 |
|
|
423 |
// Unexpected packet will be discard, and lead us reset state machine
|
|
424 |
// so that we can wait for next SETUP packet.
|
|
425 |
// Of course error will be report to any client if any there.
|
|
426 |
ChangeToStage(UsbShai::EControlTransferStageSetup);
|
|
427 |
completionCode = KErrGeneral;
|
|
428 |
}
|
|
429 |
break;
|
|
430 |
}
|
|
431 |
|
|
432 |
iTransferMgr.CtrTransferIf().ProcessStatusOutPacket(completionCode);
|
|
433 |
|
|
434 |
return furtherRequest;
|
|
435 |
|
|
436 |
}
|
|
437 |
|
|
438 |
TBool DStatusOutStageSm::IsRequstAllowed(TControlTransferRequest aRequest)
|
|
439 |
{
|
|
440 |
// Read is ok since client don't care the status out stage.
|
|
441 |
// and this lead no hurt to anybody.
|
|
442 |
TBool ret = (aRequest == TControlTransferRequestRead)?ETrue:EFalse;
|
|
443 |
|
|
444 |
if( ! ret)
|
|
445 |
{
|
|
446 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "Warning: request %d was blocked at DStatusOutStageSm",aRequest));
|
|
447 |
}
|
|
448 |
|
|
449 |
return ret;
|
|
450 |
};
|
|
451 |
|
|
452 |
// *************** Code for DATA OUT state machines **************************************
|
|
453 |
//
|
|
454 |
DDataOutStageSm::DDataOutStageSm(DControlTransferManager& aTransferMgr):
|
|
455 |
TControlStageSm(aTransferMgr)
|
|
456 |
{
|
|
457 |
}
|
|
458 |
|
|
459 |
TBool DDataOutStageSm::RequestComplete(TInt aPktSize, TInt aError, UsbShai::TControlPacketType aPktType)
|
|
460 |
{
|
|
461 |
TBool furtherRequest = EFalse;
|
|
462 |
TInt completionCode = aError;
|
|
463 |
|
|
464 |
switch(aPktType)
|
|
465 |
{
|
|
466 |
case UsbShai::EControlPacketTypeSetup:
|
|
467 |
{
|
|
468 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DDataOutStageSm - Setup recieved"));
|
|
469 |
// Host is abandon the previous Transfer
|
|
470 |
completionCode = KErrGeneral;
|
|
471 |
|
|
472 |
// Force SM restart at setup stage
|
|
473 |
ChangeToStage(UsbShai::EControlTransferStageSetup);
|
|
474 |
|
|
475 |
// this packet is partially processed here
|
|
476 |
// need another SM to continue
|
|
477 |
furtherRequest = ETrue;
|
|
478 |
}
|
|
479 |
break;
|
|
480 |
|
|
481 |
case UsbShai::EControlPacketTypeDataOut:
|
|
482 |
{
|
|
483 |
iTransferMgr.DataReceived(aPktSize);
|
|
484 |
|
|
485 |
if(!iTransferMgr.IsMoreBytesNeeded())
|
|
486 |
{
|
|
487 |
// We had recieved enough bytes as indicated by the setup
|
|
488 |
// packet, Data stage is finished. enter STATUS IN state
|
|
489 |
ChangeToStage(UsbShai::EControlTransferStageStatusIn);
|
|
490 |
}
|
|
491 |
}
|
|
492 |
break;
|
|
493 |
|
|
494 |
case UsbShai::EControlPacketTypeStatusIn:
|
|
495 |
{
|
|
496 |
// Status in had been sent to host
|
|
497 |
// return and waiting for new SETUP
|
|
498 |
ChangeToStage(UsbShai::EControlTransferStageSetup);
|
|
499 |
}
|
|
500 |
break;
|
|
501 |
|
|
502 |
default:
|
|
503 |
{
|
|
504 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DDataOutStageSm - %s recieved",DebugName[aPktType]));
|
|
505 |
|
|
506 |
// Unexpected packet will be discard, and lead us reset state machine
|
|
507 |
// so that we can wait for next SETUP packet.
|
|
508 |
// Of course error will be report to any client if any there.
|
|
509 |
ChangeToStage(UsbShai::EControlTransferStageSetup);
|
|
510 |
completionCode = KErrGeneral;
|
|
511 |
}
|
|
512 |
break;
|
|
513 |
}
|
|
514 |
|
|
515 |
ClearPendingRead();
|
|
516 |
iTransferMgr.CtrTransferIf().ProcessDataOutPacket(aPktSize,completionCode);
|
|
517 |
|
|
518 |
return furtherRequest;
|
|
519 |
}
|
|
520 |
|
|
521 |
TBool DDataOutStageSm::IsRequstAllowed(TControlTransferRequest aRequest)
|
|
522 |
{
|
|
523 |
// only read operation is allowed in data out stage.
|
|
524 |
TBool ret = (aRequest == TControlTransferRequestRead)?ETrue:EFalse;
|
|
525 |
|
|
526 |
if( ! ret)
|
|
527 |
{
|
|
528 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "Warning: request %d was blocked at DDataOutStageSm",aRequest));
|
|
529 |
}
|
|
530 |
|
|
531 |
return ret;
|
|
532 |
};
|
|
533 |
|
|
534 |
// *************** Code for DATA OUT state machines **************************************
|
|
535 |
//
|
|
536 |
DStatusInStageSm::DStatusInStageSm(DControlTransferManager& aTransferMgr):
|
|
537 |
TControlStageSm(aTransferMgr)
|
|
538 |
{
|
|
539 |
}
|
|
540 |
|
|
541 |
TBool DStatusInStageSm::RequestComplete(TInt aPktSize, TInt aError, UsbShai::TControlPacketType aPktType)
|
|
542 |
{
|
|
543 |
TBool furtherRequest = EFalse;
|
|
544 |
TInt completionCode = KErrNone;
|
|
545 |
|
|
546 |
switch(aPktType)
|
|
547 |
{
|
|
548 |
case UsbShai::EControlPacketTypeSetup:
|
|
549 |
{
|
|
550 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DStatusInStageSm - Setup recieved"));
|
|
551 |
// Status in is an optional for PSL
|
|
552 |
// If we received a setup packet here, we assume the previous
|
|
553 |
// status in packet had been successfully sent to host.
|
|
554 |
|
|
555 |
// Force SM restart at setup stage
|
|
556 |
ChangeToStage(UsbShai::EControlTransferStageSetup);
|
|
557 |
|
|
558 |
// this packet is partially processed here
|
|
559 |
// need another SM to continue
|
|
560 |
furtherRequest = ETrue;
|
|
561 |
}
|
|
562 |
break;
|
|
563 |
|
|
564 |
case UsbShai::EControlPacketTypeStatusIn:
|
|
565 |
{
|
|
566 |
// Status in had been recieved, monitor setup packet then.
|
|
567 |
ChangeToStage(UsbShai::EControlTransferStageSetup);
|
|
568 |
}
|
|
569 |
break;
|
|
570 |
|
|
571 |
default:
|
|
572 |
{
|
|
573 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "ALERT: DStatusInStageSm - %s recieved",DebugName[aPktType]));
|
|
574 |
|
|
575 |
// Unexpected packet will be discard, and lead us reset state machine
|
|
576 |
// so that we can wait for next SETUP packet.
|
|
577 |
// Of course error will be report to any client if any there.
|
|
578 |
ChangeToStage(UsbShai::EControlTransferStageSetup);
|
|
579 |
completionCode = KErrGeneral;
|
|
580 |
}
|
|
581 |
break;
|
|
582 |
}
|
|
583 |
|
|
584 |
iTransferMgr.CtrTransferIf().ProcessStatusInPacket(completionCode);
|
|
585 |
|
|
586 |
return furtherRequest;
|
|
587 |
}
|
|
588 |
|
|
589 |
TBool DStatusInStageSm::IsRequstAllowed(TControlTransferRequest aRequest)
|
|
590 |
{
|
|
591 |
// Read is ok even we are wait for the client to send a zero status packet
|
|
592 |
TBool ret = ((aRequest == TControlTransferRequestSendStatus) ||
|
|
593 |
(aRequest == TControlTransferRequestRead))?ETrue:EFalse;
|
|
594 |
|
|
595 |
if( ! ret)
|
|
596 |
{
|
|
597 |
__KTRACE_OPT(KUSB, Kern::Printf(CTSM_ID "Warning: request %d was blocked at DStatusInStageSm",aRequest));
|
|
598 |
}
|
|
599 |
|
|
600 |
return ret;
|
|
601 |
}
|
|
602 |
|
|
603 |
// End of file
|
|
604 |
|