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84 lines
2.5 KiB
84 lines
2.5 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_SENSOR_DEVICE_UTIL
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#define ANDROID_SENSOR_DEVICE_UTIL
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#include <android/hidl/manager/1.0/IServiceNotification.h>
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#include <hardware/sensors.h>
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#include <utils/Log.h>
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#include <cmath>
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#include <condition_variable>
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#include <thread>
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using ::android::hardware::hidl_string;
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using ::android::hardware::Return;
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using ::android::hidl::manager::V1_0::IServiceNotification;
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namespace android {
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namespace SensorDeviceUtils {
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// Quantizes a single value to (a fractional factor of) a sensor's resolution. Typically we
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// increase the value of the sensor's nominal resolution to ensure that sensor accuracy
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// improvements, like runtime calibration, are not masked during requantization.
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inline void quantizeValue(float *value, double resolution, double factor = 0.125) {
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if (resolution == 0) {
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return;
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}
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double incRes = factor * resolution;
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*value = round(static_cast<double>(*value) / incRes) * incRes;
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}
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// Ensures a sensor event doesn't provide values finer grained than its sensor resolution allows.
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void quantizeSensorEventValues(sensors_event_t *event, float resolution);
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// Returns the expected resolution value for the given sensor
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float resolutionForSensor(const sensor_t &sensor);
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class HidlServiceRegistrationWaiter : public IServiceNotification {
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public:
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HidlServiceRegistrationWaiter();
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Return<void> onRegistration(const hidl_string &fqName,
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const hidl_string &name,
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bool preexisting) override;
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void reset();
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/**
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* Wait for service restart
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*
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* @return true if service is restart since last reset(); false otherwise.
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*/
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bool wait();
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protected:
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void onFirstRef() override;
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private:
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bool mRegistered;
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std::mutex mLock;
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std::condition_variable mCondition;
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bool mRestartObserved;
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};
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} // namespace SensorDeviceUtils
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} // namespace android;
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#endif // ANDROID_SENSOR_SERVICE_UTIL
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