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/****************************************************************************
**
** Copyright (C) 2012 Research In Motion
** Contact: http://www.qt-project.org/
**
** This file is part of the QtSensors module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef BBSENSORBACKEND_H
#define BBSENSORBACKEND_H
#include <qsensorbackend.h>
#include <QtCore/QFile>
#include <QtCore/QSocketNotifier>
#include "sensor.h"
class BbSensorBackendBase : public QSensorBackend
{
Q_OBJECT
public:
BbSensorBackendBase(const QString &devicePath, sensor_type_e sensorType, QSensor *sensor);
void initSensorInfo();
void start();
void stop();
protected:
QFile& deviceFile();
sensor_type_e sensorType() const;
// This is called while the device file is open during initalization and gives a subclass
// an opportunity to do additional initalization.
virtual void additionalDeviceInit();
// If true is returned here, initSensorInfo() will read the output range from the OS sensor
// service and pass it to the QtSensor API.
virtual bool addDefaultRange();
// Converts a value from units of the OS sensor service to units needed by the QtSensors API.
// This is used in initSensorInfo(), where the output range is read from the backend and passed
// on to the QtSensors side.
// One example is the magnetometer: The OS sensor service returns units in microtesla, whereas
// QtSensors expects tesla. This function would therefore convert from microtesla to tesla.
virtual qreal convertValue(float bbValue);
virtual void processEvent(const sensor_event_t &sensorEvent) = 0;
virtual bool eventFilter(QObject *object, QEvent *event);
private slots:
void dataAvailable();
void applyAlwaysOnProperty();
void setPaused(bool paused);
private:
QFile m_deviceFile;
QScopedPointer<QSocketNotifier> m_socketNotifier;
sensor_type_e m_sensorType;
};
template<class SensorReading>
class BbSensorBackend : public BbSensorBackendBase
{
public:
BbSensorBackend(const QString &devicePath, sensor_type_e sensorType, QSensor *sensor)
: BbSensorBackendBase(devicePath, sensorType, sensor)
{
setReading(&m_reading);
}
protected:
virtual bool updateReadingFromEvent(const sensor_event_t &sensorEvent, SensorReading *reading) = 0;
private:
void processEvent(const sensor_event_t &sensorEvent)
{
// There may be "non-sensor" event types added later for housekeeping, so we have to check
// if the senor type matches the expected value
if (sensorEvent.type != sensorType())
return;
if (updateReadingFromEvent(sensorEvent, &m_reading)) {
// The OS timestamp is in nanoseconds, QtMobility expects microseconds
m_reading.setTimestamp(sensorEvent.timestamp / 1000);
newReadingAvailable();
}
}
SensorReading m_reading;
};
#endif
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