systemswstubs/examplecommonisc/IscDriver/inc/IscChannel.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2002-2005 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#ifndef DISCCHANNEL_H
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#define DISCCHANNEL_H
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//  INCLUDES
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#include <kernel.h>
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#include <IscMultiplexerBase.h> // TIscFrameInfo
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// CONSTANTS
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const TInt KMajorVersionNumber = 1;
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const TInt KMinorVersionNumber = 0;
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const TInt KBuildVersionNumber = 1;
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const TUint8 KBehaviormask = 15; //bits 00001111
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// MACROS
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const TInt KIscEmptyMyBuffersDfcPriority( 4 );
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// DATA TYPES
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// FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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// CLASS DECLARATION
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class DIscDevice;
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class DIscQueue;
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class IscChannelContainer;
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/**
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*  Handles all interraction with the user-side
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*
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*  @lib IscDriver.LIB
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*  @since 2.8
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*/
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class DIscChannel : public DLogicalChannel
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    {
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    public:  // Constructors and destructor
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        /**
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        * C++ default constructor.
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        * @param pointer to owner device
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        */
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        IMPORT_C DIscChannel( DLogicalDevice* aDevice );
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        /**
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        * Destructor.
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        */
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        ~DIscChannel();
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    public: // Functions from base classes
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        /**
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        * Secondary initialization of channel.
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        * @since 2.8
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        * @param  TInt aUnit Channel number
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        * @param const TDesC8* anInfo pointer to a descriptor containing extra 
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        *                             information for the device. 
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        * @param const TVersion& aVer reference containing the version being 
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        *                             requested by the thread which is opening this channel 
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        * @return virtual TInt KErrNone if succesful. KErrAlreadyExist if channel already open
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        */
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        virtual TInt DoCreate( TInt aUnit, const TDesC8* anInfo, const TVersion& aVer );
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        /**
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        * Message handling ( kernel server context ).
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        * @since 2.8
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        * @param aMsg Thread message to get parameters from user side
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        * @return void 
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        */
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        virtual void HandleMsg( TMessageBase* aMsg );
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        /**
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        * Message handling ( user thread context ).
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        * @since 2.8
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        * @param aReqNo request number called from IscApi
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        * @param a1 pointer array to get parameters from user side
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        * @param a2 not used in ISC
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        * @return TInt KErrNone if succesful
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        */
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        TInt Request( TInt aReqNo, TAny* a1, TAny* a2 );
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    public: // New functions
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        /**
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        * Function to complete clients pending asynchronous request
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        * @since 2.8
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        * @param  TInt aOperation asynchronous operation to complete
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        * @param TInt aCompleteStatus status of request to be completed
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        * @return void 
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        */
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        void CompleteRequest( TInt aOperation, TInt aCompleteStatus );
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        /**
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        * Stores the incoming frame to channels receive queue
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        * @since 2.8
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        * @param TDesC8* aData pointer to storable frame
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        * @return void 
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        */
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        void StoreFrame( TDesC8* aData );
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        /**
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        * Goes through channel's queue and delivers possible frame to client
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        * @since 2.8
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        * @return void 
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        */
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        void EmptyBuffers();
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        /**
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        * Notify user side client that uplink flow control is on/off
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        * @since 2.8
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        * @param const TInt aFlowControlStatus EIscFlowControlOn / EIscFlowControlOff
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        * @return void 
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        */
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        void NotifyFlowControl( const TInt aFlowControlStatus );
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        /**
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        * Notify user side client that status of connection between Symbian side and the Domestic OS has changed
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        * @since 2.8
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        * @param const TInt aConnectionStatus  EIscConnectionOk / EIscConnectionNotOk
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        * @return void 
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        */
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        void NotifyConnectionStatus( const TInt aConnectionStatus );
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        /**
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        * Check if asynchronous request is active
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        * @since 2.8
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        * @param const TUint16 aReqNumber Number of request
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        * @return TInt KRequestPending if request active. Otherwise KErrNone
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        */
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        TInt IsPending( const TUint16 aReqNumber );
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        /**
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        * Copy data from user buffer to kernel side buffer by multiplexer
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        * @since 2.8
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        * @param aUserBuffer pointer to source descriptor
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        * @param aKernelBuffer pointer to destination descriptor
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        * @param aOffset Offset of the source buffer
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        * @return KErrNone if successful
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        */
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        TInt CopyFromUserBuffer( const TDesC8& aUserBuffer,
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                                 TDes8& aKernelBuffer,
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                                 TInt aOffset );
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        /**
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        * Writes data/frames to clients buffer
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        * @since 2.8
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        * @param aDest pointer to destination descriptor
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        * @param aSrc pointer to source descriptor
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        * @param aOffset Offset on where to start writing to target descriptor
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        * @return TInt 
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        */
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        TInt ThreadWrite( TAny* aDest, const TDesC8* aSrc, TInt aOffset );
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        /**
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        * Delete send frames / receive queue for channel in question
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        * @since 2.8
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        * @return void 
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        */
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        void ResetBuffers();
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        /**
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        * Returns the channel number.
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        * @since 3.0
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        * @return TUint16, the number of the channel.
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        */
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        inline TUint16 GetChannelNumber(){return iChannelNumber;};
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        /**
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        * Returns a reference to user side thread of this channel.
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        * @since 3.0
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        * @param None
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        * @return DThread*, user side thread ownership is not given.
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        */
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        inline DThread* GetDThread()
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        	{
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        	return iThread;	
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        	};
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    protected: 
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		// None
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    private:
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        /**
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        * Call from user side comes to this function
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        * @since 2.8
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        * @param  TInt aFunction request number
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        * @param TAny* a1 pointer to array including info about request
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        * @param TAny* a2 not used
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        * @return TInt KErrNone if succesful
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        */
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        TInt HandleRequest( TInt aFunction, TAny* a1, TAny* a2 );
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        /**
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        * Handles channel destruction.
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        * @since 2.8
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        * @param void
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        * @return void 
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        */        
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        void ChannelDestruction();
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        /**
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        * Handles asynchronous client requests
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        * @since 2.8
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        * @param  TInt aFunction request number
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        * @param TAny* a1 pointer to array including info about request
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        * @return void 
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        */
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        void HandleAsyncRequest( TInt aFunction, TAny* a1 );
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        /**
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        * Handles synchronous client requests
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        * @since 2.8
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        * @param  TInt aFunction
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        * @param TAny* a1 pointer to array including info about request
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        * @return TInt 
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        */
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        TInt HandleSyncRequest( TInt aFunction, TAny* a1 );
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        /**
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        * Cancels active request
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        * @since 2.8
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        * @param  TInt aFunction request number
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        * @param TAny* a1 not used
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        * @return TInt 
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        */
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        TInt HandleCancelRequest( TInt aFunction, TAny* a1 );
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        /**
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        * Copies several data frames to clients buffer if needed before compliting receive request
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        * @since 2.8
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        * @param  TDes8* aPtr pointer to frame
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        * @param TIscFrameInfo& aInfo info needed in frame combining
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        * @return void 
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        */
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        void HandleConcatenatedDataFrame( TDes8* aPtr, TIscFrameInfo& aInfo );
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        /**
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        * Copies several frames to clients buffer if needed before compliting receive request
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        * @since 2.8
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        * @param  TDes8* aPtr pointer to frame
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        * @param TIscFrameInfo& aInfo info needed in frame combining
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        * @return void 
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        */
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        void HandleConcatenatedFrame( TDes8* aPtr, TIscFrameInfo& aInfo );
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        /**
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        * Initialization complete dfc
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        * @since 2.8
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        * @param TAny* aPtr pointer to channel
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        * @return static void.
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        */
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        static void InitializeComplete( TAny* aPtr );
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        /**
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        * Completes the multiplexer initialization
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        * @since 2.8
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        * @return void 
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        */
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        void DoMultiplexerInitialize();
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    private:    // Data
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        TDfc*       iInitializeDfc;
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        TPtr8*      iDataTransmissionIniData;
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        TPtr8*      iMultiplexerIniData;
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        TUint8*     iMultiplexerBuffer;
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        TUint8*     iDataTransmissionBuffer;
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        DIscDevice* iIscDevice;
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        TPtr8*      iIscConnectionStatusPtr;
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        TPtr8*      iIscFlowControlStatusPtr;
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        //Store of Isc requests
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        TRequestStatus* iIscRequests[ EIscAsyncLast ];
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        // Pointers to client message buffers
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        TPtr8*      iReceiveBufPtr;
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        TPtr8*      iDataReceiveBufPtr;
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        TPtr8*      iNeededBufLen;
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        TPtr8*      iNeededDataBufLen;
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        TUint16     iChannelNumber;
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        TBool       iChannelOpen;
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        // Queue for incoming frames
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        TUint32**   iFrameRx;
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        DIscQueue*  iFrameRxQueue;
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        // Queue for incoming data frames
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        TUint32**   iDataFrameRx;
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        DIscQueue*  iDataFrameRxQueue;
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        TInt        iULFlowControlStatus;
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        TInt        iDLFlowControlStatus;
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        // Stores the last notified uplink flowcontrol status.
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        TInt        iLastNotifiedULFlowstatus;
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        TUint16     iIscChannelHighWaterMark;
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        TUint16     iIscChannelLowWaterMark;
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        TBool       iOverFlow;
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        TBool       iClientPanic;
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        TInt        iDataTransmissionErrorCode;
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        DThread*    iThread;
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    };
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#endif      // DISCCHANNEL_H   
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// End of File