pressureadaptor.cpp

/**
   @file pressureadaptor.cpp
   @brief Contains PressureAdaptor

   <p>
   Copyright (C) 2016 Canonical,  Ltd.

   @author Lorn Potter <lorn.potter@canonical.com>

   This file is part of Sensorfw.

   Sensord is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License
   version 2.1 as published by the Free Software Foundation.

   Sensord is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with Sensord.  If not, see <http://www.gnu.org/licenses/>.
   </p>
*/

#include "pressureadaptor.h"
#include "config.h"
#include "logging.h"
#include <errno.h>
#include <fcntl.h>
#include <linux/input.h>
#include <unistd.h>
#include <QMap>

#include "datatypes/utils.h"

PressureAdaptor::PressureAdaptor(const QString& id) :
    InputDevAdaptor(id, 1)
{
    pressureBuffer_ = new DeviceAdaptorRingBuffer<TimedUnsigned>(1);
    setAdaptedSensor("pressure", "Pressure values", pressureBuffer_);
    setDescription("Input device pressure adaptor");
    powerStatePath_ = SensorFrameworkConfig::configuration()->value("pressure/powerstate_path").toByteArray();
    introduceAvailableDataRange(DataRange(0, 4095, 1));
    setDefaultInterval(10);
}

PressureAdaptor::~PressureAdaptor()
{
}

void PressureAdaptor::interpretEvent(int src, struct input_event *ev)
{
    Q_UNUSED(src);

    switch (ev->type) {
    case EV_ABS:
        switch (ev->code) {
        case ABS_X:
        case ABS_MISC:
            pressureValue_ = ev->value;
            break;
        }
        break;
    }
}

void PressureAdaptor::interpretSync(int src, struct input_event *ev)
{
    Q_UNUSED(src);
    commitOutput(ev);
}

void PressureAdaptor::commitOutput(struct input_event *ev)
{
    TimedUnsigned* lux = pressureBuffer_->nextSlot();
    lux->value_ = pressureValue_;

    lux->timestamp_ = Utils::getTimeStamp(&(ev->time));

    pressureBuffer_->commit();
    pressureBuffer_->wakeUpReaders();
}

unsigned int PressureAdaptor::evaluateIntervalRequests(int& sessionId) const
{
    unsigned int highestValue = 0;
    int winningSessionId = -1;

    if (m_intervalMap.size() == 0) {
        sessionId = winningSessionId;
        return defaultInterval();
    }

    // Get the smallest positive request, 0 is reserved for HW wakeup
    QMap<int, unsigned int>::const_iterator it;
    it = m_intervalMap.begin();
    highestValue = it.value();
    winningSessionId = it.key();

    for (++it; it != m_intervalMap.constEnd(); ++it) {
        if ((it.value() < highestValue) && (it.value() > 0)) {
            highestValue = it.value();
            winningSessionId = it.key();
        }
    }

    sessionId = winningSessionId;
    return highestValue > 0 ? highestValue : defaultInterval();
}

bool PressureAdaptor::startSensor()
{
    if (!powerStatePath_.isEmpty()) {
        writeToFile(powerStatePath_, "1");
    }
    if (SysfsAdaptor::startSensor()) {
        return true;
    }
    return false;
}

void PressureAdaptor::stopSensor()
{
    if (!powerStatePath_.isEmpty()) {
        writeToFile(powerStatePath_, "0");
    }

    SysfsAdaptor::stopSensor();
}

bool PressureAdaptor::standby()
{
    stopSensor();
    return true;
}

bool PressureAdaptor::resume()
{
    startSensor();
    return true;
}