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      1 /*
      2 * Copyright (C) 2012 Invensense, Inc.
      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 <dirent.h>
     22 #include <sys/select.h>
     23 #include <cutils/log.h>
     24 #include <linux/input.h>
     25 
     26 #include "SensorBase.h"
     27 #include "local_log_def.h"
     28 
     29 /*****************************************************************************/
     30 
     31 SensorBase::SensorBase(const char* dev_name,
     32                        const char* data_name) : dev_name(dev_name),
     33                                                 data_name(data_name),
     34                                                 dev_fd(-1),
     35                                                 data_fd(-1)
     36 {
     37     if (data_name) {
     38         data_fd = openInput(data_name);
     39     }
     40 }
     41 
     42 SensorBase::~SensorBase()
     43 {
     44     if (data_fd >= 0) {
     45         close(data_fd);
     46     }
     47     if (dev_fd >= 0) {
     48         close(dev_fd);
     49     }
     50 }
     51 
     52 int SensorBase::open_device()
     53 {
     54     if (dev_fd<0 && dev_name) {
     55         dev_fd = open(dev_name, O_RDONLY);
     56         LOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
     57     }
     58     return 0;
     59 }
     60 
     61 int SensorBase::close_device()
     62 {
     63     if (dev_fd >= 0) {
     64         close(dev_fd);
     65         dev_fd = -1;
     66     }
     67     return 0;
     68 }
     69 
     70 int SensorBase::getFd() const
     71 {
     72     if (!data_name) {
     73         return dev_fd;
     74     }
     75     return data_fd;
     76 }
     77 
     78 int SensorBase::setDelay(int32_t handle, int64_t ns)
     79 {
     80     return 0;
     81 }
     82 
     83 bool SensorBase::hasPendingEvents() const
     84 {
     85     return false;
     86 }
     87 
     88 int SensorBase::openInput(const char *inputName)
     89 {
     90     int fd = -1;
     91     const char *dirname = "/dev/input";
     92     char devname[PATH_MAX];
     93     char *filename;
     94     DIR *dir;
     95     struct dirent *de;
     96     dir = opendir(dirname);
     97     if(dir == NULL)
     98         return -1;
     99     strcpy(devname, dirname);
    100     filename = devname + strlen(devname);
    101     *filename++ = '/';
    102     while((de = readdir(dir))) {
    103         if(de->d_name[0] == '.' &&
    104                 (de->d_name[1] == '\0' ||
    105                         (de->d_name[1] == '.' && de->d_name[2] == '\0')))
    106             continue;
    107         strcpy(filename, de->d_name);
    108         fd = open(devname, O_RDONLY);
    109         LOGV_IF(EXTRA_VERBOSE, "path open %s", devname);
    110         LOGI("path open %s", devname);
    111         if (fd >= 0) {
    112             char name[80];
    113             if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
    114                 name[0] = '\0';
    115             }
    116             LOGV_IF(EXTRA_VERBOSE, "name read %s", name);
    117             if (!strcmp(name, inputName)) {
    118                 strcpy(input_name, filename);
    119                 break;
    120             } else {
    121                 close(fd);
    122                 fd = -1;
    123             }
    124         }
    125     }
    126     closedir(dir);
    127     LOGE_IF(fd < 0, "couldn't find '%s' input device", inputName);
    128     return fd;
    129 }
    130 
    131 int SensorBase::enable(int32_t handle, int enabled)
    132 {
    133     return 0;
    134 }
    135