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
write_sys_attribute(const char * path,const char * value,int bytes)69 int SensorBase::write_sys_attribute(
70 const char *path, const char *value, int bytes)
71 {
72 int fd, amt;
73
74 fd = open(path, O_WRONLY);
75 if (fd < 0) {
76 ALOGE("SensorBase: write_attr failed to open %s (%s)",
77 path, strerror(errno));
78 return -1;
79 }
80
81 amt = write(fd, value, bytes);
82 amt = ((amt == -1) ? -errno : 0);
83 ALOGE_IF(amt < 0, "SensorBase: write_int failed to write %s (%s)",
84 path, strerror(errno));
85 close(fd);
86 return amt;
87 }
88
getFd() const89 int SensorBase::getFd() const {
90 if (!data_name) {
91 return dev_fd;
92 }
93 return data_fd;
94 }
95
setDelay(int32_t handle,int64_t ns)96 int SensorBase::setDelay(int32_t handle, int64_t ns) {
97 return 0;
98 }
99
getDelay(int32_t handle)100 int64_t SensorBase::getDelay(int32_t handle) {
101 return 0;
102 }
103
hasPendingEvents() const104 bool SensorBase::hasPendingEvents() const {
105 return false;
106 }
107
getTimestamp()108 int64_t SensorBase::getTimestamp() {
109 struct timespec t;
110 t.tv_sec = t.tv_nsec = 0;
111 clock_gettime(CLOCK_MONOTONIC, &t);
112 return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec;
113 }
114
openInput(const char * inputName)115 int SensorBase::openInput(const char* inputName) {
116 int fd = -1;
117 const char *dirname = "/dev/input";
118 char devname[PATH_MAX];
119 char *filename;
120 DIR *dir;
121 struct dirent *de;
122 dir = opendir(dirname);
123 if(dir == NULL)
124 return -1;
125 strcpy(devname, dirname);
126 filename = devname + strlen(devname);
127 *filename++ = '/';
128 while((de = readdir(dir))) {
129 if(de->d_name[0] == '.' &&
130 (de->d_name[1] == '\0' ||
131 (de->d_name[1] == '.' && de->d_name[2] == '\0')))
132 continue;
133 strcpy(filename, de->d_name);
134 fd = open(devname, O_RDONLY);
135 if (fd>=0) {
136 char name[80];
137 if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
138 name[0] = '\0';
139 }
140 if (!strcmp(name, inputName)) {
141 strcpy(input_name, filename);
142 break;
143 } else {
144 close(fd);
145 fd = -1;
146 }
147 }
148 }
149 closedir(dir);
150 ALOGE_IF(fd<0, "couldn't find '%s' input device", inputName);
151 return fd;
152 }
153