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 data_fd = openInput(data_name);
40 }
41
~SensorBase()42 SensorBase::~SensorBase() {
43 if (data_fd >= 0) {
44 close(data_fd);
45 }
46 if (dev_fd >= 0) {
47 close(dev_fd);
48 }
49 }
50
open_device()51 int SensorBase::open_device() {
52 if (dev_fd<0 && dev_name) {
53 dev_fd = open(dev_name, O_RDONLY);
54 ALOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
55 }
56 return 0;
57 }
58
close_device()59 int SensorBase::close_device() {
60 if (dev_fd >= 0) {
61 close(dev_fd);
62 dev_fd = -1;
63 }
64 return 0;
65 }
66
getFd() const67 int SensorBase::getFd() const {
68 return data_fd;
69 }
70
setDelay(int32_t handle,int64_t ns)71 int SensorBase::setDelay(int32_t handle, int64_t ns) {
72 return 0;
73 }
74
hasPendingEvents() const75 bool SensorBase::hasPendingEvents() const {
76 return false;
77 }
78
getTimestamp()79 int64_t SensorBase::getTimestamp() {
80 struct timespec t;
81 t.tv_sec = t.tv_nsec = 0;
82 clock_gettime(CLOCK_MONOTONIC, &t);
83 return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec;
84 }
85
openInput(const char * inputName)86 int SensorBase::openInput(const char* inputName) {
87 int fd = -1;
88 const char *dirname = "/dev/input";
89 char devname[PATH_MAX];
90 char *filename;
91 DIR *dir;
92 struct dirent *de;
93 dir = opendir(dirname);
94 if(dir == NULL)
95 return -1;
96 strcpy(devname, dirname);
97 filename = devname + strlen(devname);
98 *filename++ = '/';
99 while((de = readdir(dir))) {
100 if(de->d_name[0] == '.' &&
101 (de->d_name[1] == '\0' ||
102 (de->d_name[1] == '.' && de->d_name[2] == '\0')))
103 continue;
104 strcpy(filename, de->d_name);
105 fd = open(devname, O_RDONLY);
106 if (fd>=0) {
107 char name[80];
108 if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
109 name[0] = '\0';
110 }
111 if (!strcmp(name, inputName)) {
112 break;
113 } else {
114 close(fd);
115 fd = -1;
116 }
117 }
118 }
119 closedir(dir);
120 ALOGE_IF(fd<0, "couldn't find '%s' input device", inputName);
121 return fd;
122 }
123