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diff --git a/src/plugins/sensors/generic/genericalssensor.cpp b/src/plugins/sensors/generic/genericalssensor.cpp
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+++ b/src/plugins/sensors/generic/genericalssensor.cpp
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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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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;
+}
+