diff -r 000000000000 -r 1e05558e2206 usbengines/usbotgwatcher/inc/cusbotgstateobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/inc/cusbotgstateobserver.h	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,165 @@
+/*
+* Copyright (c) 2008-2009 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:  Observes OTG states
+ *
+*/
+
+
+#ifndef C_USBOTGSTATEOBSERVER_H
+#define C_USBOTGSTATEOBSERVER_H
+
+#include <e32base.h>
+#include <e32property.h>
+#include <usbotgdefs.h>
+
+/**
+ *  Observer need to implement this interface to get OTG state change notifications
+ */
+NONSHARABLE_CLASS( MUsbOtgStateObserver)
+    {
+public:
+
+    /**
+     * Local device is A, and get to Idle state
+     */
+    virtual void AIdleL() = 0;
+
+    /**
+     * Local device is A, and get to Host state
+     */
+    virtual void AHostL() = 0;
+
+    /**
+     * Local device is A, and get to Peripheral state
+     */
+    virtual void APeripheralL() = 0;
+
+    /**
+     * Local device is A, and get VBus error
+     */
+    virtual void AVBusErrorL() = 0;
+
+    /**
+     * Local device is B, and get to Idle state
+     */
+    virtual void BIdleL() = 0;
+
+    /**
+     * Local device is B, and get to Peripheral state
+     */
+    virtual void BPeripheralL() = 0;
+
+    /**
+     * Local device is B, and get to Host state
+     */
+    virtual void BHostL() = 0;
+    
+    /**
+     * Error handler
+     * @param aError error code
+     */
+    virtual void OtgStateErrorL(TInt aError) = 0;    
+    };
+
+/**
+ *  Class observes OTG State property
+ *
+ */
+NONSHARABLE_CLASS( CUsbOtgStateObserver ) : public CActive
+    {
+
+public:
+
+    /**
+     * Two-phased constructor.
+     */
+    static CUsbOtgStateObserver* NewL();
+
+    /**
+     * Destructor.
+     */
+    virtual ~CUsbOtgStateObserver();
+
+    /**
+     * Gets current OTG state
+     * @return OTG state
+     */
+    TUsbOtgState OtgState();
+
+    /**
+     * Subscribes for getting notifications
+     * @param aObserver Observer
+     */
+    void SubscribeL(MUsbOtgStateObserver* aObserver);
+
+    /**
+     * Unsubscribes from getting notifications
+     * @param aObserver Observer
+     */
+    void UnsubscribeL(MUsbOtgStateObserver* aObserver);
+
+private:
+
+    // From CActive
+    /**
+     * Called when outstanding request completed
+     *
+     */
+    void RunL();
+
+    /**
+     * Called when outstanding request is cancelled
+     *
+     */
+    void DoCancel();
+
+    /**
+     * Called when RunL leaves
+     *
+     * @param errorcode
+     * @return errorcode
+     */
+    TInt RunError(TInt aError);
+
+private:
+
+    /**
+     * Default constructor
+     *
+     */
+    CUsbOtgStateObserver();
+
+    /**
+     * Second phase construction
+     *
+     */
+    void ConstructL();
+
+private:
+    // data
+
+    /**
+     * The observer reports state changes to own observers
+     * Owns
+     */
+    RPointerArray<MUsbOtgStateObserver> iObservers;
+
+    /**
+     * The observer observes property change
+     */
+    RProperty iOtgState;
+
+    };
+
+#endif //  C_USBOTGSTATEOBSERVER_H