resourcemgmt/hwrmfmtxwatcherplugin/src/hwrmfmtxusbobserver.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 11 May 2010 17:23:24 +0300
branchRCL_3
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parent 7 1fc153c72b60
permissions -rw-r--r--
Revision: 201017 Kit: 201019
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Usb observer implementation for fmtx watcher plugin.
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*
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*/
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#include "hwrmfmtxusbobserver.h"
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#include "trace.h"
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// bitmask for requesting notification of every USB device state change
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const TUint KUsbAllStates = 0xFFFFFFFF;
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// ============================ LOCAL FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// UsbConnected()
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// -----------------------------------------------------------------------------
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//
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static TBool UsbConnected( TUsbDeviceState aDeviceState )
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    {
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    INFO_LOG1( "UsbConnected - %d",  aDeviceState);
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    if ( aDeviceState == EUsbDeviceStateAttached || aDeviceState == EUsbDeviceStatePowered ||
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    		aDeviceState == EUsbDeviceStateUndefined || aDeviceState == EUsbDeviceStateSuspended )
0
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    	{
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    	RDebug::Print(_L("return false "));
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    	return EFalse;
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    	}
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    else
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    	{
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    	RDebug::Print(_L("return true "));
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    	return ETrue;
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		}
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    }
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// ============================ MEMBER FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::NewL()
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// -----------------------------------------------------------------------------
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//
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CHWRMFmtxUsbObserver* CHWRMFmtxUsbObserver::NewL( MHWRMFmtxConnObserverCallback& aObserver )
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    {
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    FUNC_LOG;
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    CHWRMFmtxUsbObserver* self = new( ELeave ) CHWRMFmtxUsbObserver( aObserver );
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    CleanupStack::PushL( self );
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    self->ConstructL();
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    CleanupStack::Pop( self );
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::~CHWRMFmtxUsbObserver()
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// -----------------------------------------------------------------------------
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//
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CHWRMFmtxUsbObserver::~CHWRMFmtxUsbObserver()
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    {
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    FUNC_LOG;
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    Cancel();
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    iUsbMan.Close();
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::GetStatusL
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// -----------------------------------------------------------------------------
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//
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TBool CHWRMFmtxUsbObserver::GetStatusL()
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    {
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    FUNC_LOG;
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    TUsbDeviceState deviceState;
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    TInt err( iUsbMan.GetDeviceState( deviceState ) );
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    LOG_IF_ERROR2( err, "CHWRMFmtxUsbObserver::StartObservingL - err %d, state %d", err, deviceState );
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    User::LeaveIfError( err );    	
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    return UsbConnected( deviceState );
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::StartObservingL
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// -----------------------------------------------------------------------------
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//
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void CHWRMFmtxUsbObserver::StartObservingL()
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    {
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    FUNC_LOG;
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    if( !IsActive() )
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        {
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        OrderUsbNotification();
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        // check the initial status, so that only state change is notified
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        iConnected = GetStatusL();
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        }
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::StopObserving
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// -----------------------------------------------------------------------------
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//
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void CHWRMFmtxUsbObserver::StopObserving()
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    {
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    FUNC_LOG;
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    Cancel();
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::CHWRMFmtxUsbObserver()
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// -----------------------------------------------------------------------------
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//
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CHWRMFmtxUsbObserver::CHWRMFmtxUsbObserver( MHWRMFmtxConnObserverCallback& aObserver ) :
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    CActive( EPriorityStandard ),
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    iDeviceState( EUsbDeviceStateUndefined ),
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    iCallback( aObserver ),
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    iConnected( ETrue )
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    {
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    FUNC_LOG;
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    CActiveScheduler::Add( this );
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::ConstructL
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// -----------------------------------------------------------------------------
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//
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void CHWRMFmtxUsbObserver::ConstructL()
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    {
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    FUNC_LOG;
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    // Connect to usbman
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	TInt err = iUsbMan.Connect();	
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    LOG_IF_ERROR1( err, "CHWRMFmtxUsbObserver::ConstructL - err %d", err );
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    User::LeaveIfError( err );
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::OrderUsbNotification()
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// -----------------------------------------------------------------------------
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//
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void CHWRMFmtxUsbObserver::OrderUsbNotification()
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    {
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    FUNC_LOG;
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    iUsbMan.DeviceStateNotification( KUsbAllStates, iDeviceState, iStatus );
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    SetActive();
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::RunL()
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// -----------------------------------------------------------------------------
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//
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void CHWRMFmtxUsbObserver::RunL( )
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    {
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    FUNC_LOG;
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    TInt status(iStatus.Int());
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    LOG_IF_ERROR1( status, "CHWRMFmtxUsbObserver::RunL error, status=%d", status );
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    TBool connected(UsbConnected( iDeviceState )); // store state before subscribing again
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    // prevent looping due to immediate completion
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    if ( status != KErrCancel && status != KErrServerTerminated )
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        {
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        OrderUsbNotification();    
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        }
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    if ( status == KErrNone )
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        {
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        INFO_LOG2( "CHWRMFmtxUsbObserver::RunL: connected=%d, iConnected=%d", connected, iConnected );
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        if ( connected != iConnected ) // notify only if state has changed
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            {
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            iConnected = connected;    
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            iCallback.HandleConnectionChange( EFmtxWatcherObserverUsb, iConnected );
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            }    
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        }
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    }
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// -----------------------------------------------------------------------------
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// CHWRMFmtxUsbObserver::DoCancel
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// ---------------------------------------------------------------------------
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//
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void CHWRMFmtxUsbObserver::DoCancel()
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    {
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    FUNC_LOG;
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    iUsbMan.DeviceStateNotificationCancel();
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    }
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//  End of File