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#include <eandroidsensordevice.h>
EventReaderThread::EventReaderThread(EAndroidSensorDevice *device) :
m_device(device)
{
}
SensorEventArray* EventReaderThread::lock()
{
m_mutex.lock();
return &m_events;
}
void EventReaderThread::run()
{
static const size_t numEvents = 16;
sensors_event_t buffer[numEvents];
int err = 0;
int n;
do {
n = m_device->m_sensorDevice->poll(m_device->m_sensorDevice, buffer, numEvents);
if (n < 0) {
qWarning("poll() failed (%s)\n", strerror(-err));
break;
}
m_mutex.lock();
for (int i = 0 ; i < n ; i++) {
sensors_event_t& event = buffer[i];
if (event.version != sizeof(sensors_event_t)) {
qWarning("incorrect event version (version=%d, expected=%d",
event.version, sizeof(sensors_event_t));
break;
}
m_events.append(event);
}
m_mutex.unlock();
eventPending();
} while (true);
}
EAndroidSensorDevice::EAndroidSensorDevice()
: m_eventThread(0),
m_sensorModule(0),
m_sensorDevice(0),
m_availableSensorsList(0),
m_initSuccess(true)
{
m_initSuccess = initSensorDevice();
if (m_initSuccess) {
m_eventThread = new EventReaderThread(this);
connect(m_eventThread, SIGNAL(eventPending()), this,
SLOT(processSensorEvents()), Qt::QueuedConnection);
} else {
qWarning("Failed to initialize sensor module. Possibly a missing sensor driver?");
}
}
EAndroidSensorDevice* EAndroidSensorDevice::m_instance = 0;
EAndroidSensorDevice* EAndroidSensorDevice::instance()
{
if (!m_instance)
m_instance = new EAndroidSensorDevice();
return m_instance;
}
void EAndroidSensorDevice::registerListener(int type, EAndroidBaseSensor *sensor, int dataRateHz)
{
bool startReaderThread = m_listenersHash.isEmpty();
bool enableSensor = m_listenersHash[type].isEmpty();
m_listenersHash[type].push_back(sensor);
if (startReaderThread)
m_eventThread->start();
if (enableSensor) {
setActive(type, true);
setDelay(type, dataRateHz);
}
}
void EAndroidSensorDevice::unregisterListener(int type, EAndroidBaseSensor *sensor)
{
m_listenersHash[type].removeOne(sensor);
bool disableSensor = m_listenersHash[type].isEmpty();
if (disableSensor)
m_listenersHash.remove(type);
bool stopReaderThread = m_listenersHash.isEmpty();
if (stopReaderThread)
m_eventThread->quit();
if (disableSensor)
setActive(type, false);
}
int EAndroidSensorDevice::indexForType(int type) const
{
for (int i = 0; i < m_availableSensors; ++i)
if (m_availableSensorsList[i].type == type)
return i;
qWarning() << "invalid sensor type: " << type;
return -1;
}
void EAndroidSensorDevice::setActive(int type, bool enable)
{
for (int i = 0; i < m_availableSensors; i++) {
if (m_availableSensorsList[i].type == type) {
int err = m_sensorDevice->activate(m_sensorDevice,
m_availableSensorsList[i].handle, enable);
if (err != 0)
qWarning("activate() for '%s'failed (%s)\n",
m_availableSensorsList[i].name, strerror(-err));
}
}
}
void EAndroidSensorDevice::setDelay(int type, int dataRateHz) const
{
qint64 ns;
// convert microseconds to nanoseconds
qint32 maxRateNs = maxDataRate(type) * 1000;
if (dataRateHz == 0) {
// if dataRateHz is not set, then we use maxRateNs
ns = maxRateNs;
} else {
// convert Hz to nanoseconds
ns = 1000000000LL / dataRateHz;
if (ns > maxRateNs)
ns = maxRateNs;
}
int index = indexForType(type);
if (index != -1)
m_sensorDevice->setDelay(m_sensorDevice,
m_availableSensorsList[index].handle, ns);
}
qint32 EAndroidSensorDevice::maxDataRate(int type) const
{
// minDelay - minimum delay allowed between events in microseconds
int index = indexForType(type);
if (index != -1)
return m_availableSensorsList[index].minDelay;
return 0;
}
QString EAndroidSensorDevice::description(int type) const
{
int index = indexForType(type);
if (index != -1) {
QString desc;
desc.append(m_availableSensorsList[index].name);
desc.append(QString(" (Vendor:%1) ").arg(m_availableSensorsList[index].vendor));
return desc;
}
return QString();
}
int EAndroidSensorDevice::availableSensors(sensor_t const** list) const
{
if (m_initSuccess)
return m_sensorModule->get_sensors_list(m_sensorModule, list);
return 0;
}
bool EAndroidSensorDevice::initSensorDevice()
{
int err = 0;
err = hw_get_module(SENSORS_HARDWARE_MODULE_ID,
(hw_module_t const**)&m_sensorModule);
if (err != 0 || !m_sensorModule) {
qWarning("hw_get_module() failed (%s)\n", strerror(-err));
return false;
}
err = sensors_open(&m_sensorModule->common, &m_sensorDevice);
if (err != 0 || !m_sensorDevice) {
qWarning("sensors_open() failed (%s)\n", strerror(-err));
return false;
}
m_availableSensors = m_sensorModule->get_sensors_list(m_sensorModule,
&m_availableSensorsList);
return true;
}
void EAndroidSensorDevice::processSensorEvents() const
{
SensorEventArray *eventqueue = m_eventThread->lock();
for (int i = 0; i < eventqueue->size(); i++) {
sensors_event_t event = eventqueue->at(i);
foreach (EAndroidBaseSensor *sensorListener, m_listenersHash[event.type])
sensorListener->processEvent(event);
}
eventqueue->clear();
m_eventThread->unlock();
}
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