diff -r 000000000000 -r 1e05558e2206 usbengines/usbotgwatcher/src/cusbhosteventnotificationobserver.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usbengines/usbotgwatcher/src/cusbhosteventnotificationobserver.cpp	Thu Dec 17 09:14:30 2009 +0200
@@ -0,0 +1,270 @@
+/*
+* 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 <usbman.h>
+
+#include "cusbhosteventnotificationobserver.h"
+
+#include "definitions.h"
+#include "debug.h"
+#include "panic.h"
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbHostEventNotificationObserver::CUsbHostEventNotificationObserver(
+        RUsb* aUsb) :
+    CActive(EPriorityStandard), iUsb(aUsb)
+    {
+    CActiveScheduler::Add(this);
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbHostEventNotificationObserver::ConstructL()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::ConstructL" ) );
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbHostEventNotificationObserver* CUsbHostEventNotificationObserver::NewL(
+        RUsb* aUsb)
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::NewL" ) );
+
+    CUsbHostEventNotificationObserver* self =
+            new (ELeave) CUsbHostEventNotificationObserver(aUsb);
+    CleanupStack::PushL(self);
+    self->ConstructL();
+    CleanupStack::Pop(self);
+    return self;
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+CUsbHostEventNotificationObserver::~CUsbHostEventNotificationObserver()
+    {
+
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::~CUsbHostEventNotificationObserver" ) );
+
+    Cancel();
+
+    iObservers.Close();
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbHostEventNotificationObserver::SubscribeL(
+        MUsbHostEventNotificationObserver* aObserver)
+    {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::SubscribeL" ) );
+
+    User::LeaveIfError(iObservers.Append(aObserver));
+
+    if (KFirst == iObservers.Count()) // first item
+        {
+        iUsb->HostEventNotification(iStatus, iEventInfo);
+        SetActive();
+
+        }
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbHostEventNotificationObserver::UnsubscribeL(
+        MUsbHostEventNotificationObserver* aObserver)
+    {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::UnsubscribeL" ) );
+    if (0 == iObservers.Count()) // no items
+        {
+        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::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]\tCUsbHostEventNotificationObserver::UnsubscribeL CanNotFindIdPinObserver" ) );
+        Panic(ECanNotFindIdPinObserver);
+        }
+
+    if (0 == iObservers.Count()) // no items
+        {
+        // cancel pending request
+        Cancel();
+        }
+    }
+
+// ---------------------------------------------------------------------------
+//
+// ---------------------------------------------------------------------------
+//
+void CUsbHostEventNotificationObserver::RunL()
+    {
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::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]->HostEventNotificationErrorL(iStatus.Int());
+                 }
+            return;
+            }
+
+    TDeviceEventInformation dei(iEventInfo);
+
+    // re-issue request first
+    iUsb->HostEventNotification(iStatus, iEventInfo);
+    SetActive();
+
+        // Log the event
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL iEventInfo.iDeviceId         = %d" ), dei.iDeviceId));
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL iEventInfo.iEventType        = %d" ), dei.iEventType));
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL iEventInfo.iError            = %d" ), dei.iError));
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL iEventInfo.iDriverLoadStatus = %d" ), dei.iDriverLoadStatus));
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL iEventInfo.iVid              = %d" ), dei.iVid));
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL iEventInfo.iPid              = %d" ), dei.iPid));
+
+    // then process property change
+    switch (dei.iEventType)
+        {
+        case EDeviceAttachment:
+            {
+                FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL DeviceAttachment" ) );
+
+            for (TInt i(0); i < iObservers.Count(); ++i)
+                {
+                iObservers[i]->DeviceAttachedL(dei);
+                }
+            break;
+            }
+
+        case EDeviceDetachment:
+            {
+                FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL DeviceDetachment" ) );
+
+            for (TInt i(0); i < iObservers.Count(); ++i)
+                {
+                iObservers[i]->DeviceDetachedL(dei);
+                }
+            break;
+            }
+
+        case EDriverLoad:
+            {
+            switch (dei.iDriverLoadStatus)
+                {
+                case EDriverLoadSuccess:
+                    {
+                        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL DriverLoadSuccess" ) );
+
+                    for (TInt i(0); i < iObservers.Count(); ++i)
+                        {
+                        iObservers[i]->DriverLoadSuccessL(dei);
+                        }
+
+                    break;
+                    }
+                case EDriverLoadPartialSuccess:
+                    {
+                        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL DriverLoadPartialSuccess" ) );
+
+                    for (TInt i(0); i < iObservers.Count(); ++i)
+                        {
+                        iObservers[i]->DriverLoadPartialSuccessL(dei);
+                        }
+                    break;
+
+                    }
+                case EDriverLoadFailure:
+                    {
+                        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL DriverLoadFailure" ) );
+
+                    for (TInt i(0); i < iObservers.Count(); ++i)
+                        {
+                        iObservers[i]->DriverLoadFailureL(dei);
+                        }
+                    break;
+                    }
+                default:
+                    {
+                        FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL DriverLoadFailure WrongDriverLoadStatus" ) );
+                    Panic(EWrongDriverLoadStatus);
+                    }
+                }
+            break;
+
+            }
+        default:
+            {
+                FLOG( _L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunL WrongHostEventNotification" ) );
+            Panic(EWrongHostEventNotification);
+            }
+
+        }
+
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+void CUsbHostEventNotificationObserver::DoCancel()
+    {
+    iUsb->HostEventNotificationCancel();
+    }
+
+// ---------------------------------------------------------------------------
+// 
+// ---------------------------------------------------------------------------
+//
+TInt CUsbHostEventNotificationObserver::RunError(TInt aError)
+    {
+
+        FTRACE( FPrint(_L( "[USBOTGWATCHER]\tCUsbHostEventNotificationObserver::RunError aError = %d" ), aError));
+
+    // try to recover and continue	
+    return KErrNone;
+
+    }
+