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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.
*/
#ifndef ANDROID_SENSOR_DEVICE_UTIL
#define ANDROID_SENSOR_DEVICE_UTIL
#include <android/hidl/manager/1.0/IServiceNotification.h>
#include <hardware/sensors.h>
#include <utils/Log.h>
#include <cmath>
#include <condition_variable>
#include <thread>
using ::android::hardware::hidl_string;
using ::android::hardware::Return;
using ::android::hidl::manager::V1_0::IServiceNotification;
namespace android {
namespace SensorDeviceUtils {
// Quantizes a single value to (a fractional factor of) a sensor's resolution. Typically we
// increase the value of the sensor's nominal resolution to ensure that sensor accuracy
// improvements, like runtime calibration, are not masked during requantization.
inline void quantizeValue(float *value, double resolution, double factor = 0.125) {
if (resolution == 0) {
return;
}
double incRes = factor * resolution;
*value = round(static_cast<double>(*value) / incRes) * incRes;
}
// Ensures a sensor event doesn't provide values finer grained than its sensor resolution allows.
void quantizeSensorEventValues(sensors_event_t *event, float resolution);
// Returns the expected resolution value for the given sensor
float resolutionForSensor(const sensor_t &sensor);
class HidlServiceRegistrationWaiter : public IServiceNotification {
public:
HidlServiceRegistrationWaiter();
Return<void> onRegistration(const hidl_string &fqName,
const hidl_string &name,
bool preexisting) override;
void reset();
/**
* Wait for service restart
*
* @return true if service is restart since last reset(); false otherwise.
*/
bool wait();
protected:
void onFirstRef() override;
private:
bool mRegistered;
std::mutex mLock;
std::condition_variable mCondition;
bool mRestartObserved;
};
} // namespace SensorDeviceUtils
} // namespace android;
#endif // ANDROID_SENSOR_SERVICE_UTIL
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