--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbdevcon/inc/cstatemachine.h	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,190 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  State machine
+*
+*/
+
+
+#ifndef CSTATEMACHINE_H
+#define CSTATEMACHINE_H
+
+class CRequestsHandler;
+class CEP0Reader;
+class CEP0Writer;
+
+/**
+ *  State machine for the control transfers
+ *  Switches usbdevcon states between Setup-Data-Status
+ *
+ *  @lib usbdevcon.lib
+ *  @since S60 v.5.0 
+ */
+ 
+class CStateMachine : public CBase 
+    {
+
+public:
+
+    /**  States */
+    enum TState
+    {
+        ENoneState,     // State is not defined 
+        ESetupStage,    // ready for getting control setup transaction
+        EDataStage,     // reading data from host, in Data stage        
+        EStatusStage    // waiting for Status transaction, after writing data to host
+    };
+
+     /**
+     * Two-phased constructor.
+     *
+     * @since S60 v.5.0
+     * @param aRequestHandler Handles requests
+     * @param aLdd Link to LDD services
+     * @return Constructed instance
+     */ 
+    static CStateMachine* NewL(CRequestsHandler& aRequestsHandler, RDevUsbcClient& aLdd);
+    
+    /**
+    * Destructor.
+    *
+    * @since S60 v.5.0
+    */
+    virtual ~CStateMachine();
+    
+    /**
+     * Call back from CEP0Reader
+     *
+     * @since S60 v.5.0
+     * @param aBuffer Data read from EP0
+     * @param aStatus status of Read request, completed
+     */
+    void ReadEP0(RBuf8& aBuffer, const TRequestStatus& aStatus);
+    
+    /**
+     * Call back from CEP0Writer
+     *
+     * @since S60 v.5.0
+     * @param aStatus status of Write request, completed
+     */
+    void WroteEP0(const TRequestStatus& aStatus);
+    
+    /**
+     * Starts machine
+     *
+     * @since S60 v.5.0
+     */
+    void Start();
+    
+    /**
+     * Stops machine
+     *
+     * @since S60 v.5.0
+     */
+    void Stop();
+    
+    /**
+     * Machine is started
+     *
+     * @since S60 v.5.0
+     * @return ETrue if state machine is started
+     */
+    TBool IsStarted() const;
+    
+private:
+    
+    /**
+     * Default construction
+     *
+     * @since S60 v.5.0
+     * @param aRequestHandler Handles requests
+     * @param aLdd Link to LDD services
+     */
+    CStateMachine(CRequestsHandler& aRequestsHandler, RDevUsbcClient& aLdd);
+    
+    /**
+     * Two-phased constructor.
+     *
+     * @since S60 v.5.0
+     */
+    void ConstructL();
+    
+    /**
+     * Process setup packet
+     *
+     * @since S60 v.5.0
+     * @param aSetupPacket Will be processed
+     */
+    void ProcessSetupPacket(RBuf8& aSetupPacket);
+    
+    /**
+     * Checks wheather data required to be sent from host to device 
+     *
+     * @since S60 v.5.0
+     * @param aSetupPacket Contains data direction bit, and length of data
+     * @param aDataLength Length of data to be sent
+     * @return ETrue If data stage is required
+     */
+    TBool IsDataFromHostRequired(const RBuf8& aSetupPacket, TUint& aDatalength) const;
+    
+    /**
+     * Checks wheather data required to be sent from device to host
+     *
+     * @since S60 v.5.0
+     * @param aSetupPacket Contains data direction bit, and length of data
+     * @param aDataLength Length of data to be sent
+     * @return ETrue If data stage is required
+     */
+    TBool IsDataFromDeviceRequired(const RBuf8& aSetupPacket, TUint& aDatalength) const;
+    
+private: // data
+    
+    /**
+     * EP0 reader
+     * Own.  
+     */
+    CEP0Reader* iEP0Reader;
+    
+    /**
+     * EP0 writer
+     * Own.  
+     */
+    CEP0Writer* iEP0Writer;
+    
+    /**
+     * Requests handler
+     * Not own.  
+     */
+    CRequestsHandler& iRequestsHandler;
+    
+    /**
+     * LDD
+     * Not own.  
+     */
+    RDevUsbcClient& iLdd;
+    
+    /**
+     * State
+     */
+    TState iState;
+    
+    /**
+     * Buffer to keep request, if needed to receive data from host in Data stage
+     * In case if request require data to be send from device to host,
+     * iBuffer keeps result of that request
+     */
+    RBuf8 iBuffer;
+        
+    };
+
+#endif // CSTATEMACHINE_H