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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "ASensorEventQueue.h"
     18 
     19 #include "ALooper.h"
     20 
     21 #define LOG_TAG "libsensorndkbridge"
     22 #include <android-base/logging.h>
     23 
     24 using android::sp;
     25 using android::frameworks::sensorservice::V1_0::Result;
     26 using android::hardware::sensors::V1_0::SensorInfo;
     27 using android::OK;
     28 using android::BAD_VALUE;
     29 using android::Mutex;
     30 using android::hardware::Return;
     31 
     32 ASensorEventQueue::ASensorEventQueue(
     33         ALooper *looper, int ident, ALooper_callbackFunc callback, void *data)
     34     : mLooper(looper),
     35       mIdent(ident),
     36       mCallback(callback),
     37       mData(data) {
     38 }
     39 
     40 void ASensorEventQueue::setImpl(const sp<IEventQueue> &queueImpl) {
     41     mQueueImpl = queueImpl;
     42 }
     43 
     44 int ASensorEventQueue::registerSensor(
     45         ASensorRef sensor,
     46         int32_t samplingPeriodUs,
     47         int64_t maxBatchReportLatencyUs) {
     48     Return<Result> ret = mQueueImpl->enableSensor(
     49             reinterpret_cast<const SensorInfo *>(sensor)->sensorHandle,
     50             samplingPeriodUs,
     51             maxBatchReportLatencyUs);
     52 
     53     if (!ret.isOk()) {
     54         return BAD_VALUE;
     55     }
     56 
     57     return OK;
     58 }
     59 
     60 int ASensorEventQueue::enableSensor(ASensorRef sensor) {
     61     static constexpr int32_t SENSOR_DELAY_NORMAL = 200000;
     62 
     63     return registerSensor(
     64             sensor, SENSOR_DELAY_NORMAL, 0 /* maxBatchReportLatencyUs */);
     65 }
     66 
     67 int ASensorEventQueue::setEventRate(
     68         ASensorRef sensor, int32_t samplingPeriodUs) {
     69     // Technically this is not supposed to enable the sensor but using this
     70     // API without enabling the sensor first is a no-op, so...
     71     return registerSensor(
     72             sensor, samplingPeriodUs, 0 /* maxBatchReportLatencyUs */);
     73 }
     74 
     75 int ASensorEventQueue::disableSensor(ASensorRef sensor) {
     76     Return<Result> ret = mQueueImpl->disableSensor(
     77             reinterpret_cast<const SensorInfo *>(sensor)->sensorHandle);
     78 
     79     return ret.isOk() ? OK : BAD_VALUE;
     80 }
     81 
     82 ssize_t ASensorEventQueue::getEvents(ASensorEvent *events, size_t count) {
     83     // XXX Should this block if there aren't any events in the queue?
     84 
     85     Mutex::Autolock autoLock(mLock);
     86 
     87     static_assert(
     88             sizeof(ASensorEvent) == sizeof(sensors_event_t), "mismatched size");
     89 
     90     size_t copy = std::min(count, mQueue.size());
     91     for (size_t i = 0; i < copy; ++i) {
     92         reinterpret_cast<sensors_event_t *>(events)[i] = mQueue[i];
     93     }
     94     mQueue.erase(mQueue.begin(), mQueue.begin() + copy);
     95 
     96     LOG(VERBOSE) << "ASensorEventQueue::getEvents() returned " << copy << " events.";
     97 
     98     return copy;
     99 }
    100 
    101 int ASensorEventQueue::hasEvents() const {
    102     return mQueue.empty();
    103 }
    104 
    105 Return<void> ASensorEventQueue::onEvent(const Event &event) {
    106     LOG(VERBOSE) << "ASensorEventQueue::onEvent";
    107 
    108     {
    109         Mutex::Autolock autoLock(mLock);
    110 
    111         mQueue.emplace_back();
    112         sensors_event_t *sensorEvent = &mQueue[mQueue.size() - 1];
    113         android::hardware::sensors::V1_0::implementation::convertToSensorEvent(
    114                 event, sensorEvent);
    115     }
    116 
    117     mLooper->signalSensorEvents(this);
    118 
    119     return android::hardware::Void();
    120 }
    121 
    122 void ASensorEventQueue::dispatchCallback() {
    123     if (mCallback != NULL) {
    124         int res = (*mCallback)(-1 /* fd */, ALOOPER_EVENT_INPUT, mData);
    125 
    126         if (res == 0) {
    127             mCallback = NULL;
    128             mData = NULL;
    129         }
    130     }
    131 }
    132 
    133 void ASensorEventQueue::invalidate() {
    134     mLooper->invalidateSensorQueue(this);
    135     setImpl(nullptr);
    136 }
    137 
    138