diff -r 000000000000 -r 1e05558e2206 usbengines/usbotgwatcher/inc/cusbhosteventnotificationobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/inc/cusbhosteventnotificationobserver.h	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,162 @@
+/*
+* 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 host events
+ *
+*/
+
+
+#ifndef C_USBHOSTEVENTNOTIFICATIONOBSERVER_H
+#define C_USBHOSTEVENTNOTIFICATIONOBSERVER_H
+
+#include <e32base.h>
+#include <e32property.h>
+#include <usbotgdefs.h>
+#include <usbhostdefs.h>
+
+class RUsb;
+
+/**
+ *  Observer must implement this interface to get notifications
+ *
+ */
+NONSHARABLE_CLASS( MUsbHostEventNotificationObserver)
+    {
+public:
+
+    /**
+     *  Called when device is attached
+     *  @param aInfo additional information
+     */
+    virtual void DeviceAttachedL(TDeviceEventInformation aInfo) = 0;
+
+    /**
+     *  Called when device is detached
+     *  @param aInfo additional information
+     */
+    virtual void DeviceDetachedL(TDeviceEventInformation aInfo) = 0;
+
+    /**
+     *  Called when drivers are loaded
+     *  @param aInfo additional information
+     */
+    virtual void DriverLoadSuccessL(TDeviceEventInformation aInfo) = 0;
+
+    /**
+     *  Called when drivers are loaded partially
+     *  @param aInfo additional information
+     */
+    virtual void DriverLoadPartialSuccessL(TDeviceEventInformation aInfo) = 0;
+
+    /**
+     *  Called when drivers loading failed
+     *  @param aInfo additional information
+     */
+    virtual void DriverLoadFailureL(TDeviceEventInformation aInfo) = 0;
+    
+    /**
+      *  Called when error happens while observing
+      *  @param aError error code
+      */
+    virtual void HostEventNotificationErrorL(TInt aError) = 0;
+
+    };
+
+/**
+ *  Class observes USB Notifications
+ */
+NONSHARABLE_CLASS( CUsbHostEventNotificationObserver ) : public CActive
+    {
+
+public:
+
+    /**
+     * Two-phased constructor.
+     * @param aUsb usbman
+     * @return this class instance
+     */
+    static CUsbHostEventNotificationObserver* NewL(RUsb* aUsb);
+
+    /**
+     * Destructor.
+     */
+    virtual ~CUsbHostEventNotificationObserver();
+
+    /**
+     * Add observer to list of observers
+     * @param aObserver observer
+     */
+    void SubscribeL(MUsbHostEventNotificationObserver* aObserver);
+
+    /**
+     * Removes observer from list of observers 
+     * @param aObserver Observer
+     */
+    void UnsubscribeL(MUsbHostEventNotificationObserver* aObserver);
+
+private:
+
+    // From CActive
+    /**
+     * Called when request completed
+     */
+    void RunL();
+
+    /**
+     * Called when outstanding request cancelled
+     */
+    void DoCancel();
+
+    /**
+     * Called when RunL leaves
+     * @param aError errorcode from RunL
+     * @return aError errorcode
+     */
+    TInt RunError(TInt aError);
+
+private:
+
+    /**
+     * Default constructor.
+     * @param aUsb usbman
+     */
+    CUsbHostEventNotificationObserver(RUsb* aUsb);
+
+    /**
+     * 2nd phase constructor.
+     */
+    void ConstructL();
+
+private:
+    // data
+
+    /**
+     * The observer reports changes to own observers
+     * Owns
+     */
+    RPointerArray<MUsbHostEventNotificationObserver> iObservers;
+
+    /**
+     * Notifications come from USB
+     * Not own
+     */
+    RUsb* iUsb;
+
+    /**
+     * Info from notification comes to this member
+     */
+    TDeviceEventInformation iEventInfo;
+
+    };
+
+#endif //  C_USBHOSTEVENTNOTIFICATIONOBSERVER_H