/*

* 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:  Usb observer implementation for fmtx watcher plugin.

*

*/

#include "hwrmfmtxusbobserver.h"

#include "trace.h"

// bitmask for requesting notification of every USB device state change

const TUint KUsbAllStates = 0xFFFFFFFF;

// ============================ LOCAL FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// UsbConnected()

// -----------------------------------------------------------------------------

//

static TBool UsbConnected( TUsbDeviceState aDeviceState )

    {

    INFO_LOG1( "UsbConnected - %d",  aDeviceState);

    if ( aDeviceState == EUsbDeviceStateAttached || aDeviceState == EUsbDeviceStatePowered ||

    		aDeviceState == EUsbDeviceStateUndefined)

    	{

    	RDebug::Print(_L("return false "));

    	return EFalse;

    	}

    else

    	{

    	RDebug::Print(_L("return true "));

    	return ETrue;

		}

    }

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::NewL()

// -----------------------------------------------------------------------------

//

CHWRMFmtxUsbObserver* CHWRMFmtxUsbObserver::NewL( MHWRMFmtxConnObserverCallback& aObserver )

    {

    FUNC_LOG;

    CHWRMFmtxUsbObserver* self = new( ELeave ) CHWRMFmtxUsbObserver( aObserver );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::~CHWRMFmtxUsbObserver()

// -----------------------------------------------------------------------------

//

CHWRMFmtxUsbObserver::~CHWRMFmtxUsbObserver()

    {

    FUNC_LOG;

    Cancel();

    iUsbMan.Close();

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::GetStatusL

// -----------------------------------------------------------------------------

//

TBool CHWRMFmtxUsbObserver::GetStatusL()

    {

    FUNC_LOG;

    TUsbDeviceState deviceState;

    TInt err( iUsbMan.GetDeviceState( deviceState ) );

    LOG_IF_ERROR2( err, "CHWRMFmtxUsbObserver::StartObservingL - err %d, state %d", err, deviceState );

    User::LeaveIfError( err );    	

    return UsbConnected( deviceState );

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::StartObservingL

// -----------------------------------------------------------------------------

//

void CHWRMFmtxUsbObserver::StartObservingL()

    {

    FUNC_LOG;

    if( !IsActive() )

        {

        OrderUsbNotification();

        // check the initial status, so that only state change is notified

        iConnected = GetStatusL();

        }

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::StopObserving

// -----------------------------------------------------------------------------

//

void CHWRMFmtxUsbObserver::StopObserving()

    {

    FUNC_LOG;

    Cancel();

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::CHWRMFmtxUsbObserver()

// -----------------------------------------------------------------------------

//

CHWRMFmtxUsbObserver::CHWRMFmtxUsbObserver( MHWRMFmtxConnObserverCallback& aObserver ) :

    CActive( EPriorityStandard ),

    iDeviceState( EUsbDeviceStateUndefined ),

    iCallback( aObserver ),

    iConnected( ETrue )

    {

    FUNC_LOG;

    CActiveScheduler::Add( this );

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::ConstructL

// -----------------------------------------------------------------------------

//

void CHWRMFmtxUsbObserver::ConstructL()

    {

    FUNC_LOG;

    // Connect to usbman

	TInt err = iUsbMan.Connect();	

    LOG_IF_ERROR1( err, "CHWRMFmtxUsbObserver::ConstructL - err %d", err );

    User::LeaveIfError( err );

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::OrderUsbNotification()

// -----------------------------------------------------------------------------

//

void CHWRMFmtxUsbObserver::OrderUsbNotification()

    {

    FUNC_LOG;

    iUsbMan.DeviceStateNotification( KUsbAllStates, iDeviceState, iStatus );

    SetActive();

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::RunL()

// -----------------------------------------------------------------------------

//

void CHWRMFmtxUsbObserver::RunL( )

    {

    FUNC_LOG;

    TInt status(iStatus.Int());

    LOG_IF_ERROR1( status, "CHWRMFmtxUsbObserver::RunL error, status=%d", status );

    TBool connected(UsbConnected( iDeviceState )); // store state before subscribing again

    // prevent looping due to immediate completion

    if ( status != KErrCancel && status != KErrServerTerminated )

        {

        OrderUsbNotification();    

        }

    if ( status == KErrNone )

        {

        INFO_LOG2( "CHWRMFmtxUsbObserver::RunL: connected=%d, iConnected=%d", connected, iConnected );

        if ( connected != iConnected ) // notify only if state has changed

            {

            iConnected = connected;    

            iCallback.HandleConnectionChange( EFmtxWatcherObserverUsb, iConnected );

            }    

        }

    }

// -----------------------------------------------------------------------------

// CHWRMFmtxUsbObserver::DoCancel

// ---------------------------------------------------------------------------

//

void CHWRMFmtxUsbObserver::DoCancel()

    {

    FUNC_LOG;

    iUsbMan.DeviceStateNotificationCancel();

    }

//  End of File