diff -r 000000000000 -r 1e05558e2206 usbengines/usbotgwatcher/inc/cusbidpinobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/inc/cusbidpinobserver.h	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,142 @@
+/*
+* 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:  Monitors ID pin change
+ *
+*/
+
+
+#ifndef C_USBIDPINOBSERVER_H
+#define C_USBIDPINOBSERVER_H
+
+#include <e32base.h>
+#include <e32property.h>
+
+/**
+ *  Obserber has to implement this interface to get ID Pin change notifications
+ *
+ */
+NONSHARABLE_CLASS( MUsbIdPinObserver)
+    {
+public:
+
+    /**
+     * IdPin disappeared
+     */
+    virtual void IdPinOffL() = 0;
+
+    /**
+     * IdPin appeared
+     */
+    virtual void IdPinOnL() = 0;
+    
+    /**
+     * IdPin error
+     * @param aError error code
+     */
+    virtual void IdPinErrorL(TInt aError) = 0;
+    
+
+    };
+
+/**
+ *  Class observes ID-PIN property
+ *
+ */
+NONSHARABLE_CLASS( CUsbIdPinObserver) : public CActive
+    {
+
+public:
+    enum TState
+        {
+        EIdPinOff = 0, EIdPinOn = 1
+        };
+
+    /**
+     * Two-phased constructor.
+     * @return instance of the objects of this class
+     */
+    static CUsbIdPinObserver* NewL();
+    
+    /**
+     * Destructor.
+     */
+    virtual ~CUsbIdPinObserver();
+
+    /**
+     * Returns current state of the IdPin
+     * @return state
+     */
+    TState IdPin() /*  not const - read comment in cpp*/;
+
+    /**
+     * Add observer
+     * @param aObserver Observer
+     */
+    void SubscribeL(MUsbIdPinObserver* aObserver);
+
+    /**
+     * Remove observer
+     * @param aObserver Observer
+     */
+    void UnsubscribeL(MUsbIdPinObserver* aObserver);
+
+private:
+
+    // From CActive
+    /**
+     * Request completed
+     */
+    void RunL();
+
+    /**
+     * Request cancelled
+     */
+    void DoCancel();
+
+    /**
+     * RunL leaved
+     * @param errorcode from RunL
+     * @return errorcode
+     */
+    TInt RunError(TInt aError);
+
+private:
+
+    /**
+     * Default constructor.
+     */
+    CUsbIdPinObserver();
+
+    /**
+     * 2nd phase constructor.
+     */
+    void ConstructL();
+
+private:
+    // data
+
+    /**
+     *  The observer reports state changes to its own observers
+     * Own
+     */
+    RPointerArray<MUsbIdPinObserver> iObservers;
+
+    /**
+     * The observer observes property change
+     */
+    RProperty iIdPin;
+
+    };
+
+#endif //  C_USBIDPINOBSERVER_H