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 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 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 51 int SensorBase::open_device() { 52 if (dev_fd<0 && dev_name) { 53 dev_fd = open(dev_name, O_RDONLY); 54 LOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno)); 55 } 56 return 0; 57 } 58 59 int SensorBase::close_device() { 60 if (dev_fd >= 0) { 61 close(dev_fd); 62 dev_fd = -1; 63 } 64 return 0; 65 } 66 67 int SensorBase::getFd() const { 68 return data_fd; 69 } 70 71 int SensorBase::setDelay(int32_t handle, int64_t ns) { 72 return 0; 73 } 74 75 bool SensorBase::hasPendingEvents() const { 76 return false; 77 } 78 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 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 LOGE_IF(fd<0, "couldn't find '%s' input device", inputName); 121 return fd; 122 } 123