1 /*
2 * Copyright (C) 2014 Invensense, Inc.
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 #if defined ANDROID_JELLYBEAN || defined ANDROID_KITKAT || defined ANDROID_LOLLIPOP
26 //build for Jellybean or KitKat
27 #define LOGV_IF ALOGV_IF
28 #define LOGE_IF ALOGE_IF
29 #define LOGI_IF ALOGI_IF
30 #define LOGI    ALOGI
31 #define LOGE    ALOGE
32 #define LOGV    ALOGV
33 #define LOGW    ALOGW
34 #else
35 //build for ICS or earlier version
36 #endif
37 
38 #define FUNC_LOG \
39             LOGV("%s", __PRETTY_FUNCTION__)
40 #define VFUNC_LOG \
41             LOGV_IF(SensorBase::FUNC_ENTRY, \
42                     "Entering function '%s'", __PRETTY_FUNCTION__)
43 #define VHANDLER_LOG \
44             LOGV_IF(SensorBase::HANDLER_ENTRY, \
45                     "Entering handler '%s'", __PRETTY_FUNCTION__)
46 #define CALL_MEMBER_FN(pobject, ptrToMember) ((pobject)->*(ptrToMember))
47 
48 #define MAX_SYSFS_NAME_LEN  (100)
49 #define IIO_BUFFER_LENGTH   (960)
50 
51 /*****************************************************************************/
52 
53 struct sensors_event_t;
54 
55 class SensorBase {
56 public:
57     /* Log enablers, each of these independent */
58     static bool PROCESS_VERBOSE;   /* process log messages */
59     static bool EXTRA_VERBOSE;     /* verbose log messages */
60     static bool SYSFS_VERBOSE;     /* log sysfs interactions as cat/echo for
61                                       repro purpose on a shell */
62     /* Note that enabling this logs may affect performance */
63     static bool FUNC_ENTRY;        /* log entry in all one-time functions */
64     static bool HANDLER_ENTRY;     /* log entry in all handler functions */
65     static bool ENG_VERBOSE;       /* log a lot more info about the internals */
66     static bool INPUT_DATA;        /* log the data input from the events */
67     static bool HANDLER_DATA;      /* log the data fetched from the handlers */
68     static bool DEBUG_BATCHING;    /* log the data for debugging batching */
69 
70 protected:
71     const char *dev_name;
72     const char *data_name;
73     char input_name[PATH_MAX];
74     int dev_fd;
75     int data_fd;
76 
77     int openInput(const char* inputName);
78     static int64_t getTimestamp();
timevalToNano(timeval const & t)79     static int64_t timevalToNano(timeval const& t) {
80         return t.tv_sec * 1000000000LL + t.tv_usec * 1000;
81     }
82 
83     int open_device();
84     int close_device();
85 
86 public:
87     SensorBase(const char* dev_name, const char* data_name);
88     virtual ~SensorBase();
89 
90     virtual int readEvents(sensors_event_t* data, int count) = 0;
91     int readSample(long *data, int64_t *timestamp);
92     int readRawSample(float *data, int64_t *timestamp);
93     virtual bool hasPendingEvents() const;
94     virtual int getFd() const;
95     virtual int setDelay(int32_t handle, int64_t ns);
96     virtual int enable(int32_t handle, int enabled);
97     virtual int query(int what, int* value);
98     virtual int batch(int handle, int flags, int64_t period_ns, int64_t timeout);
99     virtual int flush(int handle);
100 };
101 
102 /*****************************************************************************/
103 
104 #endif  // ANDROID_SENSOR_BASE_H
105