1 /*
2  * Copyright (C) 2015 Intel Corporation
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 LSM9DS0A_ACCELEROMETER_HPP
18 #define LSM9DS0A_ACCELEROMETER_HPP
19 
20 #include <hardware/sensors.h>
21 #include "Sensor.hpp"
22 #include "lsm9ds0.h"
23 
24 struct sensors_event_t;
25 
26 /**
27  * LSM9DS0Accelerometer exposes the MLSM9DS0 accelerometer sensor
28  *
29  * Overrides the pollEvents & activate Sensor methods.
30  */
31 class LSM9DS0Accelerometer : public Sensor, public upm::LSM9DS0 {
32   public:
33     /**
34      * LSM9DS0Accelerometer constructor
35      * @param pollFd poll file descriptor
36      * @param bus number of the bus
37      * @param gAddress device address
38      * @param xmAddress device address
39      */
40     LSM9DS0Accelerometer(int pollFd, int bus, uint8_t gAddress, uint8_t xmAddress);
41 
42     /**
43      * LSM9DS0Accelerometer destructor
44      */
45     ~LSM9DS0Accelerometer() override;
46 
47     /**
48      * Poll for events
49      * @param data where to store the events
50      * @param count the number of events returned must be <= to the count
51      * @return number of events returned in data on success and a negative error number otherwise
52      */
53     int pollEvents(sensors_event_t* data, int count) override;
54 
55     /**
56      * Activate the sensor
57      * @param handle sensor identifier
58      * @param enabled 1 for enabling and 0 for disabling
59      * @return 0 on success and a negative error number otherwise
60      */
61     int activate(int handle, int enabled);
62 
63 private:
64     static Sensor * createSensor(int pollFd);
65     static void initModule() __attribute__((constructor
66         (DEFAULT_SENSOR_CONSTRUCTOR_PRIORITY)));
67 
68     int pollFd;
69     static struct sensor_t sensorDescription;
70 };
71 
72 #endif  // LSM9DS0A_ACCELEROMETER_HPP
73