Home | History | Annotate | Download | only in sensors 
      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