diff -r 2b40d63a9c3d -r 90517678cc4f qtmobility/plugins/sensors/generic/genericrotationsensor.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qtmobility/plugins/sensors/generic/genericrotationsensor.cpp	Mon May 03 13:18:40 2010 +0300
@@ -0,0 +1,115 @@
+/****************************************************************************
+**
+** 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 "genericrotationsensor.h"
+#include <QDebug>
+#include <qmath.h>
+
+#define RADIANS_TO_DEGREES 57.2957795
+
+const char *genericrotationsensor::id("generic.rotation");
+
+genericrotationsensor::genericrotationsensor(QSensor *sensor)
+    : QSensorBackend(sensor)
+{
+    accelerometer = new QAccelerometer(this);
+    accelerometer->addFilter(this);
+    accelerometer->connectToBackend();
+
+    setReading<QRotationReading>(&m_reading);
+    setDataRates(accelerometer);
+
+    sensor->setProperty("hasZ", false);
+}
+
+void genericrotationsensor::start()
+{
+    accelerometer->setDataRate(sensor()->dataRate());
+    accelerometer->start();
+    if (!accelerometer->isActive())
+        sensorStopped();
+    if (accelerometer->isBusy())
+        sensorBusy();
+}
+
+void genericrotationsensor::stop()
+{
+    accelerometer->stop();
+}
+
+bool genericrotationsensor::filter(QSensorReading *reading)
+{
+    QAccelerometerReading *ar = qobject_cast<QAccelerometerReading*>(reading);
+    qreal pitch = 0;
+    qreal roll = 0;
+
+    qreal x = ar->x();
+    qreal y = ar->y();
+    qreal z = ar->z();
+
+    // Note that the formula used come from this document:
+    // http://www.freescale.com/files/sensors/doc/app_note/AN3461.pdf
+    pitch = qAtan(y / sqrt(x*x + z*z)) * RADIANS_TO_DEGREES;
+    roll = qAtan(x / sqrt(y*y + z*z)) * RADIANS_TO_DEGREES;
+    // Roll is a left-handed rotation but we need right-handed rotation
+    roll = -roll;
+
+    // We need to fix up roll to the (-180,180] range required.
+    // Check for negative theta values and apply an offset as required.
+    // Note that theta is defined as the angle of the Z axis relative
+    // to gravity (see referenced document). It's negative when the
+    // face of the device points downward.
+    qreal theta = qAtan(sqrt(x*x + y*y) / z) * RADIANS_TO_DEGREES;
+    if (theta < 0) {
+        if (roll > 0)
+            roll = 180 - roll;
+        else
+            roll = -180 - roll;
+    }
+
+    m_reading.setTimestamp(ar->timestamp());
+    m_reading.setX(pitch);
+    m_reading.setY(roll);
+    m_reading.setZ(0);
+    newReadingAvailable();
+    return false;
+}
+