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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 #ifndef android_hardware_automotive_vehicle_V2_0_Obd2SensorStore_H_
     18 #define android_hardware_automotive_vehicle_V2_0_Obd2SensorStore_H_
     19 
     20 #include <vector>
     21 
     22 #include <android/hardware/automotive/vehicle/2.0/types.h>
     23 
     24 namespace android {
     25 namespace hardware {
     26 namespace automotive {
     27 namespace vehicle {
     28 namespace V2_0 {
     29 
     30 // This class wraps all the logic required to create an OBD2 frame.
     31 // It allows storing sensor values, setting appropriate bitmasks as needed,
     32 // and returning appropriately laid out storage of sensor values suitable
     33 // for being returned via a VehicleHal implementation.
     34 class Obd2SensorStore {
     35    public:
     36     // Creates a sensor storage with a given number of vendor-specific sensors.
     37     Obd2SensorStore(size_t numVendorIntegerSensors, size_t numVendorFloatSensors);
     38 
     39     // Stores an integer-valued sensor.
     40     StatusCode setIntegerSensor(DiagnosticIntegerSensorIndex index, int32_t value);
     41     // Stores an integer-valued sensor.
     42     StatusCode setIntegerSensor(size_t index, int32_t value);
     43 
     44     // Stores a float-valued sensor.
     45     StatusCode setFloatSensor(DiagnosticFloatSensorIndex index, float value);
     46     // Stores a float-valued sensor.
     47     StatusCode setFloatSensor(size_t index, float value);
     48 
     49     // Returns a vector that contains all integer sensors stored.
     50     const std::vector<int32_t>& getIntegerSensors() const;
     51     // Returns a vector that contains all float sensors stored.
     52     const std::vector<float>& getFloatSensors() const;
     53     // Returns a vector that contains a bitmask for all stored sensors.
     54     const std::vector<uint8_t>& getSensorsBitmask() const;
     55 
     56     // Given a stringValue, fill in a VehiclePropValue
     57     void fillPropValue(const std::string& dtc, VehiclePropValue* propValue) const;
     58 
     59    private:
     60     class BitmaskInVector {
     61        public:
     62         BitmaskInVector(size_t numBits = 0);
     63         void resize(size_t numBits);
     64         bool get(size_t index) const;
     65         void set(size_t index, bool value);
     66 
     67         const std::vector<uint8_t>& getBitmask() const;
     68 
     69        private:
     70         std::vector<uint8_t> mStorage;
     71     };
     72 
     73     std::vector<int32_t> mIntegerSensors;
     74     std::vector<float> mFloatSensors;
     75     BitmaskInVector mSensorsBitmask;
     76 };
     77 
     78 }  // namespace V2_0
     79 }  // namespace vehicle
     80 }  // namespace automotive
     81 }  // namespace hardware
     82 }  // namespace android
     83 
     84 #endif  // android_hardware_automotive_vehicle_V2_0_Obd2SensorStore_H_
     85