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 33SensorBase::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 44SensorBase::~SensorBase() { 45 if (data_fd >= 0) { 46 close(data_fd); 47 } 48 if (dev_fd >= 0) { 49 close(dev_fd); 50 } 51} 52 53int 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 61int SensorBase::close_device() { 62 if (dev_fd >= 0) { 63 close(dev_fd); 64 dev_fd = -1; 65 } 66 return 0; 67} 68 69int SensorBase::getFd() const { 70 if (!data_name) { 71 return dev_fd; 72 } 73 return data_fd; 74} 75 76int SensorBase::setDelay(int32_t handle, int64_t ns) { 77 return 0; 78} 79 80bool SensorBase::hasPendingEvents() const { 81 return false; 82} 83 84int64_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 91int 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