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      1 /*
      2  * Copyright (C) 2008-2014 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 <dirent.h>
     18 #include <errno.h>
     19 #include <fcntl.h>
     20 #include <linux/input.h>
     21 #include <math.h>
     22 #include <poll.h>
     23 #include <string.h>
     24 #include <sys/select.h>
     25 #include <unistd.h>
     26 
     27 #include <cutils/log.h>
     28 
     29 #include "SensorBase.h"
     30 
     31 /*****************************************************************************/
     32 
     33 #undef LOG_TAG
     34 #define LOG_TAG "CwMcuSensor"
     35 
     36 SensorBase::SensorBase(
     37         const char* dev_name,
     38         const char* data_name)
     39     : dev_name(dev_name)
     40     , data_name(data_name)
     41     , dev_fd(-1)
     42     , data_fd(-1)
     43 {
     44 }
     45 
     46 SensorBase::~SensorBase() {
     47     if (data_fd >= 0) {
     48         close(data_fd);
     49     }
     50     if (dev_fd >= 0) {
     51         close(dev_fd);
     52     }
     53 }
     54 
     55 int SensorBase::open_device() {
     56     if (dev_fd<0 && dev_name) {
     57         dev_fd = open(dev_name, O_RDONLY);
     58         ALOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
     59     }
     60     return 0;
     61 }
     62 
     63 int SensorBase::close_device() {
     64     if (dev_fd >= 0) {
     65         close(dev_fd);
     66         dev_fd = -1;
     67     }
     68     return 0;
     69 }
     70 
     71 int SensorBase::write_sys_attribute(
     72         const char *path, const char *value, int bytes)
     73 {
     74     int fd, amt;
     75 
     76     fd = open(path, O_WRONLY);
     77     if (fd < 0) {
     78         ALOGE("SensorBase: write_attr failed to open %s (%s)",
     79                 path, strerror(errno));
     80         return -1;
     81     }
     82 
     83     amt = write(fd, value, bytes);
     84     amt = ((amt == -1) ? -errno : 0);
     85     ALOGE_IF(amt < 0, "SensorBase: write_int failed to write %s (%s)",
     86                 path, strerror(errno));
     87     close(fd);
     88     return amt;
     89 }
     90 
     91 int SensorBase::getFd() const {
     92     if (!data_name) {
     93         return dev_fd;
     94     }
     95     return data_fd;
     96 }
     97 
     98 int SensorBase::setDelay(int32_t, int64_t) {
     99     return 0;
    100 }
    101 
    102 int64_t SensorBase::getDelay(int32_t) {
    103     return 0;
    104 }
    105 
    106 bool SensorBase::hasPendingEvents() const {
    107     return false;
    108 }
    109 
    110 int64_t SensorBase::getTimestamp() {
    111     struct timespec t;
    112     t.tv_sec = t.tv_nsec = 0;
    113     clock_gettime(CLOCK_BOOTTIME, &t);
    114     return int64_t(t.tv_sec)*NS_PER_SEC + t.tv_nsec;
    115 }
    116 
    117