1/*
2 * Copyright (C) 2008 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_SENSOR_BASE_H
18#define ANDROID_SENSOR_BASE_H
19
20#include <stdint.h>
21#include <errno.h>
22#include <sys/cdefs.h>
23#include <sys/types.h>
24
25
26/*****************************************************************************/
27
28struct sensors_event_t;
29
30class SensorBase {
31protected:
32    const char* dev_name;
33    const char* data_name;
34    char        input_name[PATH_MAX];
35    int         dev_fd;
36    int         data_fd;
37
38    int openInput(const char* inputName);
39    static int64_t getTimestamp();
40
41
42    static int64_t timevalToNano(timeval const& t) {
43        return t.tv_sec*1000000000LL + t.tv_usec*1000;
44    }
45
46    int open_device();
47    int close_device();
48	int write_int(char const *path, int value);
49	int write_sys_attribute(
50		char const *path, char const *value, int bytes);
51
52public:
53            SensorBase(
54                    const char* dev_name,
55                    const char* data_name);
56
57    virtual ~SensorBase();
58
59    virtual int readEvents(sensors_event_t* data, int count) = 0;
60    virtual bool hasPendingEvents() const;
61    virtual int getFd() const;
62
63    virtual int setDelay(int32_t handle, int64_t ns);
64    virtual int64_t getDelay(int32_t handle);
65
66	/* When this function is called, increments the reference counter. */
67    virtual int setEnable(int32_t handle, int enabled) = 0;
68	/* It returns the number of reference. */
69    virtual int getEnable(int32_t handle) = 0;
70};
71
72/*****************************************************************************/
73
74#endif  // ANDROID_SENSOR_BASE_H
75