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 <string.h> 22#include <unistd.h> 23#include <dirent.h> 24#include <sys/select.h> 25 26#include <cutils/log.h> 27 28#include <linux/input.h> 29 30#include "SensorBase.h" 31 32/*****************************************************************************/ 33 34SensorBase::SensorBase( 35 const char* dev_name, 36 const char* data_name) 37 : dev_name(dev_name), data_name(data_name), 38 dev_fd(-1), data_fd(-1) 39{ 40 if (data_name) { 41 data_fd = openInput(data_name); 42 } 43} 44 45SensorBase::~SensorBase() { 46 if (data_fd >= 0) { 47 close(data_fd); 48 } 49 if (dev_fd >= 0) { 50 close(dev_fd); 51 } 52} 53 54int SensorBase::open_device() { 55 if (dev_fd<0 && dev_name) { 56 dev_fd = open(dev_name, O_RDONLY); 57 ALOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno)); 58 } 59 return 0; 60} 61 62int SensorBase::close_device() { 63 if (dev_fd >= 0) { 64 close(dev_fd); 65 dev_fd = -1; 66 } 67 return 0; 68} 69 70int SensorBase::write_sys_attribute( 71 const char *path, const char *value, int bytes) 72{ 73 int fd, amt; 74 75 fd = open(path, O_WRONLY); 76 if (fd < 0) { 77 ALOGE("SensorBase: write_attr failed to open %s (%s)", 78 path, strerror(errno)); 79 return -1; 80 } 81 82 amt = write(fd, value, bytes); 83 amt = ((amt == -1) ? -errno : 0); 84 ALOGE_IF(amt < 0, "SensorBase: write_int failed to write %s (%s)", 85 path, strerror(errno)); 86 close(fd); 87 return amt; 88} 89 90int SensorBase::getFd() const { 91 if (!data_name) { 92 return dev_fd; 93 } 94 return data_fd; 95} 96 97int SensorBase::setDelay(int32_t handle, int64_t ns) { 98 return 0; 99} 100 101int64_t SensorBase::getDelay(int32_t handle) { 102 return 0; 103} 104 105bool SensorBase::hasPendingEvents() const { 106 return false; 107} 108 109int64_t SensorBase::getTimestamp() { 110 struct timespec t; 111 t.tv_sec = t.tv_nsec = 0; 112 clock_gettime(CLOCK_MONOTONIC, &t); 113 return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec; 114} 115 116int SensorBase::openInput(const char* inputName) { 117 int fd = -1; 118 const char *dirname = "/dev/input"; 119 char devname[PATH_MAX]; 120 char *filename; 121 DIR *dir; 122 struct dirent *de; 123 dir = opendir(dirname); 124 if(dir == NULL) 125 return -1; 126 strcpy(devname, dirname); 127 filename = devname + strlen(devname); 128 *filename++ = '/'; 129 while((de = readdir(dir))) { 130 if(de->d_name[0] == '.' && 131 (de->d_name[1] == '\0' || 132 (de->d_name[1] == '.' && de->d_name[2] == '\0'))) 133 continue; 134 strcpy(filename, de->d_name); 135 fd = open(devname, O_RDONLY); 136 if (fd>=0) { 137 char name[80]; 138 if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) { 139 name[0] = '\0'; 140 } 141 if (!strcmp(name, inputName)) { 142 strcpy(input_name, filename); 143 break; 144 } else { 145 close(fd); 146 fd = -1; 147 } 148 } 149 } 150 closedir(dir); 151 ALOGE_IF(fd<0, "couldn't find '%s' input device", inputName); 152 return fd; 153} 154