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      1 /*
      2  * Copyright (C) 2010 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 <stdint.h>
     18 #include <math.h>
     19 #include <sys/types.h>
     20 
     21 #include <utils/Errors.h>
     22 
     23 #include <hardware/sensors.h>
     24 
     25 #include "LinearAccelerationSensor.h"
     26 #include "SensorDevice.h"
     27 #include "SensorFusion.h"
     28 
     29 namespace android {
     30 // ---------------------------------------------------------------------------
     31 
     32 LinearAccelerationSensor::LinearAccelerationSensor(sensor_t const* list, size_t count)
     33     : mSensorDevice(SensorDevice::getInstance()),
     34       mGravitySensor(list, count)
     35 {
     36 }
     37 
     38 bool LinearAccelerationSensor::process(sensors_event_t* outEvent,
     39         const sensors_event_t& event)
     40 {
     41     bool result = mGravitySensor.process(outEvent, event);
     42     if (result && event.type == SENSOR_TYPE_ACCELEROMETER) {
     43         outEvent->data[0] = event.acceleration.x - outEvent->data[0];
     44         outEvent->data[1] = event.acceleration.y - outEvent->data[1];
     45         outEvent->data[2] = event.acceleration.z - outEvent->data[2];
     46         outEvent->sensor = '_lin';
     47         outEvent->type = SENSOR_TYPE_LINEAR_ACCELERATION;
     48         return true;
     49     }
     50     return false;
     51 }
     52 
     53 status_t LinearAccelerationSensor::activate(void* ident, bool enabled) {
     54     return mGravitySensor.activate(ident, enabled);
     55 }
     56 
     57 status_t LinearAccelerationSensor::setDelay(void* ident, int handle, int64_t ns) {
     58     return mGravitySensor.setDelay(ident, handle, ns);
     59 }
     60 
     61 Sensor LinearAccelerationSensor::getSensor() const {
     62     Sensor gsensor(mGravitySensor.getSensor());
     63     sensor_t hwSensor;
     64     hwSensor.name       = "Linear Acceleration Sensor";
     65     hwSensor.vendor     = "AOSP";
     66     hwSensor.version    = gsensor.getVersion();
     67     hwSensor.handle     = '_lin';
     68     hwSensor.type       = SENSOR_TYPE_LINEAR_ACCELERATION;
     69     hwSensor.maxRange   = gsensor.getMaxValue();
     70     hwSensor.resolution = gsensor.getResolution();
     71     hwSensor.power      = gsensor.getPowerUsage();
     72     hwSensor.minDelay   = gsensor.getMinDelay();
     73     Sensor sensor(&hwSensor);
     74     return sensor;
     75 }
     76 
     77 // ---------------------------------------------------------------------------
     78 }; // namespace android
     79 
     80