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/*
* Copyright (C) 2015 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cutils/log.h>
#include <hardware/sensors.h>
#include <errno.h>
#include "Sensor.hpp"
/* maximum delay: 1000ms */
const int64_t kMaxDelay = 1000000000;
Sensor::Sensor() : acquisitionThread(nullptr), handle(-1), type(-1), delay(kMaxDelay) {}
Sensor::~Sensor() {
if (acquisitionThread != nullptr) {
delete acquisitionThread;
acquisitionThread = nullptr;
}
}
int Sensor::activate(int handle, int enabled) { return 0; }
bool Sensor::readOneEvent(sensors_event_t *event) {
int rc;
if (acquisitionThread == nullptr) {
ALOGE("%s: sensor %d doesn't have an acquisition thread", __func__, handle);
return false;
}
/* read one event from the pipe read endpoint */
rc = read(acquisitionThread->getReadPipeFd(), event, sizeof(sensors_event_t));
if (rc != sizeof(sensors_event_t)) {
return false;
}
return true;
}
int Sensor::activateAcquisitionThread(int handle, int enabled) {
if (enabled) {
/* create/init acquisition thread if necessary */
if (acquisitionThread == nullptr) {
acquisitionThread = new AcquisitionThread(this);
if (!acquisitionThread->init()) {
ALOGE("%s: Cannot initialize acquisition thread for sensor %d",
__func__, handle);
delete acquisitionThread;
acquisitionThread = nullptr;
return -1;
}
} else {
ALOGE("%s: Sensor %d is already enabled", __func__, handle);
}
} else {
/* free acquisition thread resources */
if (acquisitionThread != nullptr) {
delete acquisitionThread;
acquisitionThread = nullptr;
} else {
ALOGE("%s: Sensor %d is already disabled", __func__, handle);
}
}
return 0;
}
int Sensor::setDelay(int handle, int64_t requestedDelay) {
if (requestedDelay < 0) {
return -EINVAL;
}
if (requestedDelay > kMaxDelay) {
requestedDelay = kMaxDelay;
}
this->delay = requestedDelay;
/* wake up thread to immediately change the delay */
if (acquisitionThread != nullptr) {
return acquisitionThread->wakeup();
}
return 0;
}
int Sensor::batch(int handle, int flags,
int64_t period_ns, int64_t timeout) {
/* batching mode is not supported; call setDelay */
return setDelay(handle, period_ns);
}
int Sensor::flush(int handle) {
if (acquisitionThread == nullptr) {
return -EINVAL;
}
/* batching mode is not supported; generate META_DATA_FLUSH_COMPLETE */
if (acquisitionThread->generateFlushCompleteEvent()) {
return 0;
}
return -1;
}
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