/libsensors/SensorBase.cpp
http://github.com/CyanogenMod/android_device_zte_blade · C++ · 122 lines · 92 code · 14 blank · 16 comment · 18 complexity · 84677eb87053299f895707a04705b648 MD5 · raw file
- /*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include <fcntl.h>
- #include <errno.h>
- #include <math.h>
- #include <poll.h>
- #include <unistd.h>
- #include <dirent.h>
- #include <sys/select.h>
- #include <cutils/log.h>
- #include <linux/input.h>
- #include "SensorBase.h"
- /*****************************************************************************/
- SensorBase::SensorBase(
- const char* dev_name,
- const char* data_name)
- : dev_name(dev_name), data_name(data_name),
- dev_fd(-1), data_fd(-1)
- {
- data_fd = openInput(data_name);
- }
- SensorBase::~SensorBase() {
- if (data_fd >= 0) {
- close(data_fd);
- }
- if (dev_fd >= 0) {
- close(dev_fd);
- }
- }
- int SensorBase::open_device() {
- if (dev_fd<0 && dev_name) {
- dev_fd = open(dev_name, O_RDONLY);
- LOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
- }
- return 0;
- }
- int SensorBase::close_device() {
- if (dev_fd >= 0) {
- close(dev_fd);
- dev_fd = -1;
- }
- return 0;
- }
- int SensorBase::getFd() const {
- return data_fd;
- }
- int SensorBase::setDelay(int32_t handle, int64_t ns) {
- return 0;
- }
- bool SensorBase::hasPendingEvents() const {
- return false;
- }
- int64_t SensorBase::getTimestamp() {
- struct timespec t;
- t.tv_sec = t.tv_nsec = 0;
- clock_gettime(CLOCK_MONOTONIC, &t);
- return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec;
- }
- int SensorBase::openInput(const char* inputName) {
- int fd = -1;
- const char *dirname = "/dev/input";
- char devname[PATH_MAX];
- char *filename;
- DIR *dir;
- struct dirent *de;
- dir = opendir(dirname);
- if(dir == NULL)
- return -1;
- strcpy(devname, dirname);
- filename = devname + strlen(devname);
- *filename++ = '/';
- while((de = readdir(dir))) {
- if(de->d_name[0] == '.' &&
- (de->d_name[1] == '\0' ||
- (de->d_name[1] == '.' && de->d_name[2] == '\0')))
- continue;
- strcpy(filename, de->d_name);
- fd = open(devname, O_RDONLY);
- if (fd>=0) {
- char name[80];
- if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
- name[0] = '\0';
- }
- if (!strcmp(name, inputName)) {
- break;
- } else {
- close(fd);
- fd = -1;
- }
- }
- }
- closedir(dir);
- LOGE_IF(fd<0, "couldn't find '%s' input device", inputName);
- return fd;
- }