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 #include <fcntl.h>
18 #include <errno.h>
19 #include <math.h>
20 #include <poll.h>
21 #include <unistd.h>
22 #include <dirent.h>
23 #include <sys/select.h>
24
25 #include <cutils/log.h>
26
27 #include <linux/input.h>
28
29 #include "SensorBase.h"
30
31 /*****************************************************************************/
32
SensorBase(const char * dev_name,const char * data_name)33 SensorBase::SensorBase(
34 const char* dev_name,
35 const char* data_name)
36 : dev_name(dev_name), data_name(data_name),
37 dev_fd(-1), data_fd(-1)
38 {
39 if (data_name) {
40 data_fd = openInput(data_name);
41 }
42 }
43
~SensorBase()44 SensorBase::~SensorBase() {
45 if (data_fd >= 0) {
46 close(data_fd);
47 }
48 if (dev_fd >= 0) {
49 close(dev_fd);
50 }
51 }
52
open_device()53 int SensorBase::open_device() {
54 if (dev_fd<0 && dev_name) {
55 dev_fd = open(dev_name, O_RDONLY);
56 ALOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
57 }
58 return 0;
59 }
60
close_device()61 int SensorBase::close_device() {
62 if (dev_fd >= 0) {
63 close(dev_fd);
64 dev_fd = -1;
65 }
66 return 0;
67 }
68
getFd() const69 int SensorBase::getFd() const {
70 if (!data_name) {
71 return dev_fd;
72 }
73 return data_fd;
74 }
75
setDelay(int32_t handle,int64_t ns)76 int SensorBase::setDelay(int32_t handle, int64_t ns) {
77 return 0;
78 }
79
hasPendingEvents() const80 bool SensorBase::hasPendingEvents() const {
81 return false;
82 }
83
getTimestamp()84 int64_t SensorBase::getTimestamp() {
85 struct timespec t;
86 t.tv_sec = t.tv_nsec = 0;
87 clock_gettime(CLOCK_MONOTONIC, &t);
88 return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec;
89 }
90
openInput(const char * inputName)91 int SensorBase::openInput(const char* inputName) {
92 int fd = -1;
93 const char *dirname = "/dev/input";
94 char devname[PATH_MAX];
95 char *filename;
96 DIR *dir;
97 struct dirent *de;
98 dir = opendir(dirname);
99 if(dir == NULL)
100 return -1;
101 strcpy(devname, dirname);
102 filename = devname + strlen(devname);
103 *filename++ = '/';
104 while((de = readdir(dir))) {
105 if(de->d_name[0] == '.' &&
106 (de->d_name[1] == '\0' ||
107 (de->d_name[1] == '.' && de->d_name[2] == '\0')))
108 continue;
109 strcpy(filename, de->d_name);
110 fd = open(devname, O_RDONLY);
111 if (fd>=0) {
112 char name[80];
113 if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
114 name[0] = '\0';
115 }
116 if (!strcmp(name, inputName)) {
117 strcpy(input_name, filename);
118 break;
119 } else {
120 close(fd);
121 fd = -1;
122 }
123 }
124 }
125 closedir(dir);
126 ALOGE_IF(fd<0, "couldn't find '%s' input device", inputName);
127 return fd;
128 }
129