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      1 /*
      2  * Copyright (C) 2018 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 "chre/platform/shared/platform_sensor_util.h"
     18 
     19 #include <cinttypes>
     20 
     21 #include "chre/core/event_loop_manager.h"
     22 #include "chre/core/sensor.h"
     23 #include "chre/platform/assert.h"
     24 #include "chre/util/memory.h"
     25 
     26 namespace chre {
     27 
     28 void updateLastEvent(SensorType sensorType, const void *eventData) {
     29   CHRE_ASSERT(eventData);
     30 
     31   auto *header = static_cast<const chreSensorDataHeader *>(eventData);
     32   if (header->readingCount != 1) {
     33     // TODO: better error handling when there are more than one samples.
     34     LOGE("%" PRIu16 " samples in an event for on-change sensor %" PRIu8,
     35          header->readingCount, static_cast<uint8_t>(sensorType));
     36   } else {
     37     struct CallbackData {
     38       SensorType sensorType;
     39       const ChreSensorData *event;
     40     };
     41     auto *callbackData = memoryAlloc<CallbackData>();
     42     if (callbackData == nullptr) {
     43       LOG_OOM();
     44     } else {
     45       callbackData->sensorType = sensorType;
     46       callbackData->event = static_cast<const ChreSensorData *>(eventData);
     47 
     48       auto callback = [](uint16_t /* type */, void *data) {
     49         auto *cbData = static_cast<CallbackData *>(data);
     50 
     51         Sensor *sensor = EventLoopManagerSingleton::get()
     52             ->getSensorRequestManager().getSensor(cbData->sensorType);
     53 
     54         // Mark last event as valid only if the sensor is enabled. Event data
     55         // may arrive after sensor is disabled.
     56         if (sensor != nullptr
     57             && sensor->getRequest().getMode() != SensorMode::Off) {
     58           sensor->setLastEvent(cbData->event);
     59         }
     60         memoryFree(cbData);
     61       };
     62 
     63       // Schedule a deferred callback.
     64       EventLoopManagerSingleton::get()->deferCallback(
     65           SystemCallbackType::SensorLastEventUpdate, callbackData, callback);
     66     }
     67   }
     68 }
     69 
     70 }  // namespace chre
     71