1 /*
2 * Copyright (C) 2008-2014 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 <dirent.h>
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <linux/input.h>
21 #include <math.h>
22 #include <poll.h>
23 #include <string.h>
24 #include <sys/select.h>
25 #include <unistd.h>
26
27 #include <cutils/log.h>
28
29 #include "SensorBase.h"
30
31 /*****************************************************************************/
32
33 #undef LOG_TAG
34 #define LOG_TAG "CwMcuSensor"
35
SensorBase(const char * dev_name,const char * data_name)36 SensorBase::SensorBase(
37 const char* dev_name,
38 const char* data_name)
39 : dev_name(dev_name)
40 , data_name(data_name)
41 , dev_fd(-1)
42 , data_fd(-1)
43 {
44 }
45
~SensorBase()46 SensorBase::~SensorBase() {
47 if (data_fd >= 0) {
48 close(data_fd);
49 }
50 if (dev_fd >= 0) {
51 close(dev_fd);
52 }
53 }
54
open_device()55 int SensorBase::open_device() {
56 if (dev_fd<0 && dev_name) {
57 dev_fd = open(dev_name, O_RDONLY);
58 ALOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
59 }
60 return 0;
61 }
62
close_device()63 int SensorBase::close_device() {
64 if (dev_fd >= 0) {
65 close(dev_fd);
66 dev_fd = -1;
67 }
68 return 0;
69 }
70
write_sys_attribute(const char * path,const char * value,int bytes)71 int SensorBase::write_sys_attribute(
72 const char *path, const char *value, int bytes)
73 {
74 int fd, amt;
75
76 fd = open(path, O_WRONLY);
77 if (fd < 0) {
78 ALOGE("SensorBase: write_attr failed to open %s (%s)",
79 path, strerror(errno));
80 return -1;
81 }
82
83 amt = write(fd, value, bytes);
84 amt = ((amt == -1) ? -errno : 0);
85 ALOGE_IF(amt < 0, "SensorBase: write_int failed to write %s (%s)",
86 path, strerror(errno));
87 close(fd);
88 return amt;
89 }
90
getFd() const91 int SensorBase::getFd() const {
92 if (!data_name) {
93 return dev_fd;
94 }
95 return data_fd;
96 }
97
setDelay(int32_t,int64_t)98 int SensorBase::setDelay(int32_t, int64_t) {
99 return 0;
100 }
101
getDelay(int32_t)102 int64_t SensorBase::getDelay(int32_t) {
103 return 0;
104 }
105
hasPendingEvents() const106 bool SensorBase::hasPendingEvents() const {
107 return false;
108 }
109
getTimestamp()110 int64_t SensorBase::getTimestamp() {
111 struct timespec t;
112 t.tv_sec = t.tv_nsec = 0;
113 clock_gettime(CLOCK_BOOTTIME, &t);
114 return int64_t(t.tv_sec)*NS_PER_SEC + t.tv_nsec;
115 }
116
117