diff -r 000000000000 -r 1e05558e2206 usbengines/usbotgwatcher/src/cusbvbusobserver.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/src/cusbvbusobserver.cpp	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,246 @@
+/*
+* 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 "cusbvbusobserver.h"
+
+#include "definitions.h"
+#include "debug.h"
+#include "panic.h"
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbVBusObserver::CUsbVBusObserver() :
+    CActive(EPriorityStandard)
+    {
+    CActiveScheduler::Add(this);
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbVBusObserver::ConstructL()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::ConstructL" ) );
+
+    User::LeaveIfError(iVBus.Attach(KUidUsbManCategory,
+            KUsbOtgVBusPoweredProperty));
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbVBusObserver* CUsbVBusObserver::NewL()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::NewL" ) );
+
+    CUsbVBusObserver* self = new (ELeave) CUsbVBusObserver();
+    CleanupStack::PushL(self);
+    self->ConstructL();
+    CleanupStack::Pop(self);
+    return self;
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbVBusObserver::~CUsbVBusObserver()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::~CUsbVBusObserver" ) );
+
+    Cancel();
+
+    iVBus.Close();
+
+    iObservers.Close();
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbVBusObserver::TState CUsbVBusObserver::VBus() /* not const, because for some reason RProperty::Get is not const! */
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::VBus" ) );
+
+    TInt val(0);
+
+    TInt err = iVBus.Get(val);
+
+    if (KErrNone != err)
+        {
+            FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::VBus CanNotGetVBusProperty" ) );
+        Panic(ECanNotGetVBusProperty);
+        }
+
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbVBusObserver::VBus = %d" ), val ));
+
+    // not found in docs clear definition of this property. Verification is needed   
+    return (0 == val ? EVBusDown : EVBusUp);
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbVBusObserver::SubscribeL(MUsbVBusObserver* aObserver)
+    {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::SubscribeL" ) );
+
+    User::LeaveIfError(iObservers.Append(aObserver));
+
+    if (KFirst == iObservers.Count()) // first item
+        {
+        iVBus.Subscribe(iStatus);
+        SetActive();
+        }
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbVBusObserver::UnsubscribeL(MUsbVBusObserver* aObserver)
+    {
+    FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::UnsubscribeL" ) );
+    
+    if (0 == iObservers.Count()) // no items
+        {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::UnsubscribeL No observers" ) );
+        return;
+        }
+    
+    TInt i(0);
+    while (i < iObservers.Count() && aObserver != iObservers[i])
+        {
+        ++i;
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbVBusObserver::UnsubscribeL i = %d" ), i ));
+        }
+
+    if (aObserver == iObservers[i]) // found
+        {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::UnsubscribeL Removing item" ) );
+        iObservers.Remove(i);
+        }
+    else
+        {
+            FLOG( _L( "[USBOTGWATCHER]\tCUsbVBusObserver::UnsubscribeL CanNotFindVBusObserver" ) );
+        Panic(ECanNotFindVBusObserver);
+        }
+    
+    if (0 == iObservers.Count()) // no observers anymore
+        {
+        // cancel pending request, if any
+        Cancel();
+        return;
+        }
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+void CUsbVBusObserver::RunL()
+    {
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbVBusObserver::RunL iStatus = %d" ), iStatus.Int()));
+
+        // if error occured, tell to Observers
+        if(KErrNone != iStatus.Int()) 
+            {
+            for (TInt i(0); i < iObservers.Count(); ++i)
+                 {
+                 iObservers[i]->VBusObserverErrorL(iStatus.Int());
+                 }
+            return;
+            }
+
+    // re-issue request first
+    iVBus.Subscribe(iStatus);
+    SetActive();
+
+    // then process property change
+    TState state(VBus());
+
+    // report change   
+    switch (state)
+        {
+        case EVBusUp:
+            {
+                FLOG(_L( "[USBOTGWATCHER]\tCUsbVBusObserver::RunL VBus UP"));
+
+            for (TInt i(0); i < iObservers.Count(); ++i)
+                {
+                iObservers[i]->VBusUpL();
+                }
+            break;
+            }
+            ;
+
+        case EVBusDown:
+            {
+                FLOG(_L( "[USBOTGWATCHER]\tCUsbVBusObserver::RunL VBus DOWN"));
+
+            for (TInt i(0); i < iObservers.Count(); ++i)
+                {
+                iObservers[i]->VBusDownL();
+                }
+            break;
+            }
+            ;
+
+        default:
+            {
+            Panic(EWrongVBusState);
+            }
+        }
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbVBusObserver::DoCancel()
+    {
+    iVBus.Cancel();
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+TInt CUsbVBusObserver::RunError(TInt aError)
+    {
+
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbVBusObserver::RunError aError = %d" ), aError));
+
+    // try to continue	
+    return KErrNone;
+    }