--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/inc/cusbbusactivityobserver.h	Fri Jun 04 10:27:39 2010 +0100
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 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:  Monitors USB activity
+ *
+ */
+
+#ifndef C_USBBUSACTIVITYOBSERVER_H
+#define C_USBBUSACTIVITYOBSERVER_H
+
+#include <e32base.h>
+#include <e32property.h>
+
+/**
+ *  This interface has to be implemented by observer
+ *  to receive notifications from USB bus activity property
+ */
+NONSHARABLE_CLASS(MUsbBusActivityObserver)
+    {
+public:
+
+    /**
+     * Called when bus turn to idle
+     */
+    virtual void BusIdleL() = 0;
+
+    /**
+     * Called when when bus is in Idle, and some activity appears on the bus
+     */
+    virtual void BusActiveL() = 0;
+
+    /**
+     * Called when when error happened
+     * @param aError errorcode
+     */
+    virtual void BusActivityErrorL(TInt aError) = 0;
+
+    };
+
+/**
+ *  Class observes USB OTG State property
+ *
+ */
+NONSHARABLE_CLASS(CUsbBusActivityObserver) : public CActive
+    {
+
+public:
+
+    enum TBusActivity
+        {
+        EBusIdle = 0, EBusActive = 1
+        };
+
+    /**
+     * Two-phased constructor.
+     */
+    static CUsbBusActivityObserver* NewL();
+
+    /**
+     * Destructor.
+     */
+    virtual ~CUsbBusActivityObserver();
+
+    /**
+     * Returns bus activity state
+     * @return bus activity
+     */
+    TBusActivity BusActivity();
+
+    /**
+     * Adds subscriber for the notification
+     * @param aObserver Observer
+     */
+    void SubscribeL(MUsbBusActivityObserver& aObserver);
+
+    /**
+     * Removes observer
+     * @param aObserver Observer
+     */
+    void UnsubscribeL(MUsbBusActivityObserver& aObserver);
+
+private:
+
+    // From CActive
+    /**
+     * Called when request on bus activity completed
+     */
+    void RunL();
+
+    /**
+     * Called by framwork, when canceling outstanding request
+     */
+    void DoCancel();
+
+    /**
+     * Called when RunL leaves
+     * @param aError error code
+     */
+    TInt RunError(TInt aError);
+
+private:
+
+    /**
+     * Default constructor
+     */
+    CUsbBusActivityObserver();
+
+    /**
+     * 2nd phase construction
+     */
+    void ConstructL();
+
+private:
+    // data
+
+    /**
+     * The observer reports state changes to own observers
+     * Not owns
+     */
+    RPointerArray<MUsbBusActivityObserver> iObservers;
+
+    /**
+     * The observer observes property change
+     */
+    RProperty iBusActivity;
+
+    };
+
+#endif //  C_USBOTGSTATEOBSERVER_H