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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "genericalssensor.h"
#include <QDebug>
char const * const genericalssensor::id("generic.als");
genericalssensor::genericalssensor(QSensor *sensor)
: QSensorBackend(sensor)
{
lightSensor = new QLightSensor(this);
lightSensor->addFilter(this);
lightSensor->connectToBackend();
setReading<QAmbientLightReading>(&m_reading);
setDataRates(lightSensor);
}
void genericalssensor::start()
{
lightSensor->setDataRate(sensor()->dataRate());
lightSensor->start();
if (!lightSensor->isActive())
sensorStopped();
if (lightSensor->isBusy())
sensorBusy();
}
void genericalssensor::stop()
{
lightSensor->stop();
}
struct lux_limit {
int min;
int max;
};
// Defines the min and max lux values that a given level has.
// These are used to add histeresis to the sensor.
// If the previous level is below a level, the lux must be at or above the minimum.
// If the previous level is above a level, the lux muyt be at or below the maximum.
static lux_limit limits[] = {
{ 0, 0 }, // Undefined (not used)
{ 0, 5 }, // Dark
{ 10, 50 }, // Twilight
{ 100, 200 }, // Light
{ 500, 2000 }, // Bright
{ 5000, 0 } // Sunny
};
#if 0
// Used for debugging
static QString light_level(int level)
{
switch (level) {
case 1:
return QLatin1String("Dark");
case 2:
return QLatin1String("Twilight");
case 3:
return QLatin1String("Light");
case 4:
return QLatin1String("Bright");
case 5:
return QLatin1String("Sunny");
default:
return QLatin1String("Undefined");
}
}
#endif
bool genericalssensor::filter(QLightReading *reading)
{
// It's unweildly dealing with these constants so make some
// local aliases that are shorter. This makes the code below
// much easier to read.
enum {
Undefined = QAmbientLightReading::Undefined,
Dark = QAmbientLightReading::Dark,
Twilight = QAmbientLightReading::Twilight,
Light = QAmbientLightReading::Light,
Bright = QAmbientLightReading::Bright,
Sunny = QAmbientLightReading::Sunny
};
int lightLevel = m_reading.lightLevel();
qreal lux = reading->lux();
// Check for change direction to allow for histeresis
if (lightLevel < Sunny && lux >= limits[Sunny ].min) lightLevel = Sunny;
else if (lightLevel < Bright && lux >= limits[Bright ].min) lightLevel = Bright;
else if (lightLevel < Light && lux >= limits[Light ].min) lightLevel = Light;
else if (lightLevel < Twilight && lux >= limits[Twilight].min) lightLevel = Twilight;
else if (lightLevel < Dark && lux >= limits[Dark ].min) lightLevel = Dark;
else if (lightLevel > Dark && lux <= limits[Dark ].max) lightLevel = Dark;
else if (lightLevel > Twilight && lux <= limits[Twilight].max) lightLevel = Twilight;
else if (lightLevel > Light && lux <= limits[Light ].max) lightLevel = Light;
else if (lightLevel > Bright && lux <= limits[Bright ].max) lightLevel = Bright;
//qDebug() << "lightLevel" << light_level(lightLevel) << "lux" << lux;
if (static_cast<int>(m_reading.lightLevel()) != lightLevel || m_reading.timestamp() == 0) {
m_reading.setTimestamp(reading->timestamp());
m_reading.setLightLevel(static_cast<QAmbientLightReading::LightLevel>(lightLevel));
newReadingAvailable();
}
return false;
}
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