--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/inc/cusbvbusobserver.h	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,142 @@
+/*
+* Copyright (c) 2008-2008 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:  Implements VBus observer
+ *
+*/
+
+
+#ifndef C_USBVBUSOBSERVER_H
+#define C_USBVBUSOBSERVER_H
+
+#include <e32base.h>
+#include <e32property.h>
+
+/**
+ * Observers of this class have to implement this interface
+ * to get call back on VBus events
+ */
+NONSHARABLE_CLASS( MUsbVBusObserver)
+    {
+public:
+
+    /**
+     * VBus down event received
+     */
+    virtual void VBusDownL() = 0;
+    /**
+     * VBus up event received
+     */
+    virtual void VBusUpL() = 0;
+    /**
+     * error handler
+     * @param aError error code
+     */   
+    virtual void VBusObserverErrorL(TInt aError)=0;
+
+    };
+
+/**
+ *  Class observes VBUS property
+ *
+ */
+NONSHARABLE_CLASS( CUsbVBusObserver ) : public CActive
+    {
+
+public:
+    enum TState
+        {
+        EVBusDown = 0, EVBusUp = 1
+
+        };
+
+    /**
+     * Two-phased constructor.
+     */
+    static CUsbVBusObserver* NewL();
+
+    /**
+     * Destructor.
+     */
+    virtual ~CUsbVBusObserver();
+
+    /**
+     * VBus state getter
+     * @return VBus state
+     */
+    TState VBus() /* not const. read comment in impl*/;
+
+    /**
+     * Adds observer to a list
+     * @param aObserver observer
+     */
+    void SubscribeL(MUsbVBusObserver* aObserver);
+
+    /**
+     * removes observer from list
+     * @param aObserver observer
+     */
+    void UnsubscribeL(MUsbVBusObserver* aObserver);
+
+private:
+
+    // From CActive
+    /**
+     * Called when request completed
+     *
+     */
+    void RunL();
+
+    /**
+     * Called when request is cancelled
+     *
+     */
+    void DoCancel();
+
+    /**
+     * Called when RunL leaves
+     * @param aError error code
+     * @return error code
+     *
+     */
+    TInt RunError(TInt aError);
+
+private:
+
+    /**
+     * Default constructor
+     */
+    CUsbVBusObserver();
+
+    /**
+     * 2nd phase constructor
+     */
+    void ConstructL();
+
+private:
+    // data
+
+    /**
+     * The observer reports state changes to own observers
+     * Own
+     */
+    RPointerArray<MUsbVBusObserver> iObservers;
+
+    /**
+     * The observer observes property change
+     */
+    RProperty iVBus;
+
+    };
+
+#endif //  C_USBVBUSOBSERVER_H