diff -r 000000000000 -r 1e05558e2206 usbengines/usbotgwatcher/src/cusbbusactivityobserver.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/src/cusbbusactivityobserver.cpp	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,242 @@
+/*
+* 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:  Implementation
+ *
+*/
+
+
+#include <usbotgdefs.h>
+
+#include "cusbbusactivityobserver.h"
+
+#include "definitions.h"
+#include "debug.h"
+#include "panic.h"
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbBusActivityObserver::CUsbBusActivityObserver() :
+    CActive(EPriorityStandard)
+    {
+    CActiveScheduler::Add(this);
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbBusActivityObserver::ConstructL()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::ConstructL" ) );
+
+    User::LeaveIfError(iBusActivity.Attach(KUidUsbManCategory,
+            KUsbOtgConnectionIdleProperty));
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbBusActivityObserver* CUsbBusActivityObserver::NewL()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::NewL" ) );
+
+    CUsbBusActivityObserver* self = new (ELeave) CUsbBusActivityObserver();
+    CleanupStack::PushL(self);
+    self->ConstructL();
+    CleanupStack::Pop(self);
+    return self;
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbBusActivityObserver::~CUsbBusActivityObserver()
+
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::~CUsbBusActivityObserver" ) );
+
+    Cancel();
+
+    iBusActivity.Close();
+
+    iObservers.Close();
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbBusActivityObserver::TBusActivity CUsbBusActivityObserver::BusActivity()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::BusActivity" ) );
+
+    TInt val(0);
+
+    TInt err = iBusActivity.Get(val);
+
+    if (KErrNone != err)
+        {
+            FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::BusActivity CanNotGetBusActivityProperty" ) );
+        Panic(ECanNotGetBusActivityProperty);
+        }
+
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::State = %d" ), val ));
+
+    return (0 == val ? EBusActive : EBusIdle);
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbBusActivityObserver::SubscribeL(MUsbBusActivityObserver* aObserver)
+    {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::SubscribeL" ) );
+
+    User::LeaveIfError(iObservers.Append(aObserver));
+
+    if (KFirst == iObservers.Count()) // first item
+        {
+        iBusActivity.Subscribe(iStatus);
+        SetActive();
+
+        }
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbBusActivityObserver::UnsubscribeL(MUsbBusActivityObserver* aObserver)
+    {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::UnsubscribeL" ) );
+
+    if (0 == iObservers.Count()) // no items
+        {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::UnsubscribeL No observers" ) );
+        return;
+        }
+        
+    TInt i(0);
+    while (i < iObservers.Count() && aObserver != iObservers[i])
+        ++i;
+
+    if (aObserver == iObservers[i]) // found
+        {
+        iObservers.Remove(i);
+        }
+    else
+        {
+            FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::UnsubscribeL CanNotFindBusActivityObserver " ) );
+        Panic(ECanNotFindBusActivityObserver);
+        }
+
+    if (0 == iObservers.Count()) // no items
+        {
+        // cancel pending request
+        Cancel();
+        }
+    }
+
+// ---------------------------------------------------------------------------
+
+// ---------------------------------------------------------------------------
+//
+void CUsbBusActivityObserver::RunL()
+    {
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::RunL iStatus = %d" ), iStatus.Int()));
+
+    // if error occured, inform observers
+    if(KErrNone != iStatus.Int())
+        {
+        for (TInt i(0); i < iObservers.Count(); ++i)
+                    {
+                    iObservers[i]->BusActivityErrorL(iStatus.Int());
+                    }
+        }
+
+    // re-issue request first
+    iBusActivity.Subscribe(iStatus);
+    SetActive();
+
+    // then process property change
+    TBusActivity state(BusActivity());
+
+    switch (state)
+        {
+        case EBusIdle:
+            {
+                FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::RunL BusIdle" ) );
+
+            for (TInt i(0); i < iObservers.Count(); ++i)
+                {
+                iObservers[i]->BusIdleL();
+                }
+            break;
+            }
+
+        case EBusActive:
+            {
+                FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::RunL BusActive" ) );
+
+            for (TInt i(0); i < iObservers.Count(); ++i)
+                {
+                iObservers[i]->BusActiveL();
+                }
+            break;
+            }
+
+        default:
+            {
+                FLOG( _L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::RunL BusActive WrongBusState" ) );
+            Panic(EWrongBusState);
+            }
+        }
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbBusActivityObserver::DoCancel()
+    {
+    iBusActivity.Cancel();
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+TInt CUsbBusActivityObserver::RunError(TInt aError)
+    {
+
+    FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbBusActivityObserver::RunError aError = %d" ), aError));
+                  
+    // try to continue	
+    return KErrNone;
+
+    }
+