usbengines/usbotgwatcher/inc/cusbotgstateobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:14:30 +0200
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/*
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* Copyright (c) 2008-2009 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:  Observes OTG states
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 *
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*/
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#ifndef C_USBOTGSTATEOBSERVER_H
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#define C_USBOTGSTATEOBSERVER_H
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#include <e32base.h>
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#include <e32property.h>
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#include <usbotgdefs.h>
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/**
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 *  Observer need to implement this interface to get OTG state change notifications
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 */
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NONSHARABLE_CLASS( MUsbOtgStateObserver)
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    {
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public:
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    /**
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     * Local device is A, and get to Idle state
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     */
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    virtual void AIdleL() = 0;
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    /**
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     * Local device is A, and get to Host state
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     */
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    virtual void AHostL() = 0;
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    /**
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     * Local device is A, and get to Peripheral state
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     */
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    virtual void APeripheralL() = 0;
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    /**
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     * Local device is A, and get VBus error
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     */
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    virtual void AVBusErrorL() = 0;
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    /**
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     * Local device is B, and get to Idle state
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     */
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    virtual void BIdleL() = 0;
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    /**
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     * Local device is B, and get to Peripheral state
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     */
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    virtual void BPeripheralL() = 0;
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    /**
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     * Local device is B, and get to Host state
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     */
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    virtual void BHostL() = 0;
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    /**
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     * Error handler
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     * @param aError error code
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     */
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    virtual void OtgStateErrorL(TInt aError) = 0;    
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    };
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/**
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 *  Class observes OTG State property
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 *
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 */
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NONSHARABLE_CLASS( CUsbOtgStateObserver ) : public CActive
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    {
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public:
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    /**
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     * Two-phased constructor.
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     */
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    static CUsbOtgStateObserver* NewL();
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    /**
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     * Destructor.
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     */
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    virtual ~CUsbOtgStateObserver();
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    /**
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     * Gets current OTG state
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     * @return OTG state
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     */
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    TUsbOtgState OtgState();
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    /**
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     * Subscribes for getting notifications
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     * @param aObserver Observer
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     */
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    void SubscribeL(MUsbOtgStateObserver* aObserver);
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    /**
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     * Unsubscribes from getting notifications
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     * @param aObserver Observer
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     */
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    void UnsubscribeL(MUsbOtgStateObserver* aObserver);
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private:
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    // From CActive
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    /**
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     * Called when outstanding request completed
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     *
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     */
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    void RunL();
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    /**
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     * Called when outstanding request is cancelled
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     *
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     */
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    void DoCancel();
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    /**
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     * Called when RunL leaves
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     *
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     * @param errorcode
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     * @return errorcode
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     */
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    TInt RunError(TInt aError);
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private:
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    /**
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     * Default constructor
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     *
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     */
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    CUsbOtgStateObserver();
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    /**
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     * Second phase construction
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     *
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     */
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    void ConstructL();
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private:
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    // data
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    /**
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     * The observer reports state changes to own observers
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     * Owns
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     */
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    RPointerArray<MUsbOtgStateObserver> iObservers;
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    /**
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     * The observer observes property change
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     */
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    RProperty iOtgState;
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    };
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#endif //  C_USBOTGSTATEOBSERVER_H