/*
|
* Copyright (C) 2016 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.
|
*/
|
|
#include <algorithm>
|
|
#include "chre/core/sensor_request.h"
|
#include "chre/platform/assert.h"
|
#include "chre/platform/fatal_error.h"
|
|
namespace chre {
|
namespace {
|
|
Nanoseconds getBatchInterval(const SensorRequest& request) {
|
// With capping in SensorRequest constructor, interval + latency < UINT64_MAX.
|
// When the return value is default, request latency (instead of batch
|
// interval) will be used to compute the merged latency.
|
if (request.getInterval() == Nanoseconds(CHRE_SENSOR_INTERVAL_DEFAULT)
|
|| request.getLatency() == Nanoseconds(CHRE_SENSOR_LATENCY_DEFAULT)) {
|
return Nanoseconds(CHRE_SENSOR_BATCH_INTERVAL_DEFAULT);
|
} else {
|
return request.getInterval() + request.getLatency();
|
}
|
}
|
|
} // namespace
|
|
SensorRequest::SensorRequest()
|
: SensorRequest(SensorMode::Off,
|
Nanoseconds(CHRE_SENSOR_INTERVAL_DEFAULT),
|
Nanoseconds(CHRE_SENSOR_LATENCY_DEFAULT)) {}
|
|
SensorRequest::SensorRequest(SensorMode mode, Nanoseconds interval,
|
Nanoseconds latency)
|
: SensorRequest(kInvalidInstanceId, mode, interval, latency) {}
|
|
SensorRequest::SensorRequest(uint32_t instanceId, SensorMode mode,
|
Nanoseconds interval, Nanoseconds latency)
|
: mInstanceId(instanceId), mInterval(interval), mLatency(latency),
|
mMode(mode) {
|
// cap non-default interval/latency to ensure no overflow in CHRE internal
|
// operations.
|
if (interval != Nanoseconds(CHRE_SENSOR_INTERVAL_DEFAULT)) {
|
mInterval = std::min(interval, Nanoseconds(kMaxIntervalLatencyNs));
|
}
|
if (latency != Nanoseconds(CHRE_SENSOR_LATENCY_DEFAULT)) {
|
mLatency = std::min(latency, Nanoseconds(kMaxIntervalLatencyNs));
|
}
|
}
|
|
bool SensorRequest::isEquivalentTo(const SensorRequest& request) const {
|
return (mMode == request.mMode
|
&& mInterval == request.mInterval
|
&& mLatency == request.mLatency);
|
}
|
|
bool SensorRequest::mergeWith(const SensorRequest& request) {
|
bool attributesChanged = false;
|
if (request.mMode != SensorMode::Off) {
|
// Calculate minimum batch interval before mInterval is modified.
|
Nanoseconds batchInterval = std::min(getBatchInterval(*this),
|
getBatchInterval(request));
|
|
if (request.mInterval < mInterval) {
|
mInterval = request.mInterval;
|
attributesChanged = true;
|
}
|
|
if (batchInterval == Nanoseconds(CHRE_SENSOR_BATCH_INTERVAL_DEFAULT)) {
|
// If batchInterval is default, it can't be effectively calculated.
|
// Use request.mLatency for more aggressive latency merging in this case.
|
Nanoseconds latency = request.mLatency;
|
if (latency < mLatency) {
|
mLatency = latency;
|
attributesChanged = true;
|
}
|
} else {
|
Nanoseconds latency = (batchInterval - mInterval);
|
|
// Note that while batchInterval can only shrink after merging, latency
|
// can grow if the merged interval is lower.
|
// Also, it's guaranteed that latency <= kMaxIntervalLatencyNs.
|
if (latency != mLatency) {
|
mLatency = latency;
|
attributesChanged = true;
|
}
|
}
|
|
// Compute the highest priority mode. Active continuous is the highest
|
// priority and passive one-shot is the lowest.
|
SensorMode maximalSensorMode = SensorMode::Off;
|
if (mMode == SensorMode::ActiveContinuous
|
|| request.mMode == SensorMode::ActiveContinuous) {
|
maximalSensorMode = SensorMode::ActiveContinuous;
|
} else if (mMode == SensorMode::ActiveOneShot
|
|| request.mMode == SensorMode::ActiveOneShot) {
|
maximalSensorMode = SensorMode::ActiveOneShot;
|
} else if (mMode == SensorMode::PassiveContinuous
|
|| request.mMode == SensorMode::PassiveContinuous) {
|
maximalSensorMode = SensorMode::PassiveContinuous;
|
} else if (mMode == SensorMode::PassiveOneShot
|
|| request.mMode == SensorMode::PassiveOneShot) {
|
maximalSensorMode = SensorMode::PassiveOneShot;
|
} else {
|
CHRE_ASSERT(false);
|
}
|
|
if (mMode != maximalSensorMode) {
|
mMode = maximalSensorMode;
|
attributesChanged = true;
|
}
|
}
|
|
return attributesChanged;
|
}
|
|
} // namespace chre
|
