input.c

   1 /*
   2  * Copyright (C) 2013 Paul Kocialkowski
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <stdint.h>
  21 #include <fcntl.h>
  22 #include <errno.h>
  23 #include <dirent.h>
  24 #include <linux/ioctl.h>
  25 #include <linux/input.h>
  26
  27 #define LOG_TAG "piranha_sensors"
  28 #include <utils/Log.h>
  29
  30 #include "piranha_sensors.h"
  31
  32 int64_t input_timestamp(struct input_event *event)
  33 {
  34         if (event == NULL)
  35                 return -1;
  36
  37         return event->time.tv_sec*1000000000LL + event->time.tv_usec*1000;
  38 }
  39
  40 int input_open(char *name)
  41 {
  42         DIR *d;
  43         struct dirent *di;
  44
  45         char input_name[80] = { 0 };
  46         char path[PATH_MAX];
  47         int fd;
  48         int rc;
  49
  50         if (name == NULL)
  51                 return -EINVAL;
  52
  53         d = opendir("/dev/input");
  54         if (d == NULL)
  55                 return -1;
  56
  57         while ((di = readdir(d))) {
  58                 if (di == NULL || strcmp(di->d_name, ".") == 0 || strcmp(di->d_name, "..") == 0)
  59                         continue;
  60
  61                 snprintf(path, PATH_MAX, "/dev/input/%s", di->d_name);
  62                 fd = open(path, O_RDONLY | O_NONBLOCK);
  63                 if (fd < 0)
  64                         continue;
  65
  66                 rc = ioctl(fd, EVIOCGNAME(sizeof(input_name) - 1), &input_name);
  67                 if (rc < 0)
  68                         continue;
  69
  70                 if (strcmp(input_name, name) == 0)
  71                         return fd;
  72                 else
  73                         close(fd);
  74         }
  75
  76         return -1;
  77 }
  78
  79 int sysfs_path_prefix(char *name, char *path_prefix)
  80 {
  81         DIR *d;
  82         struct dirent *di;
  83
  84         char input_name[80] = { 0 };
  85         char path[PATH_MAX];
  86         int fd;
  87
  88         if (name == NULL || path_prefix == NULL)
  89                 return -EINVAL;
  90
  91         d = opendir("/sys/class/input");
  92         if (d == NULL)
  93                 return -1;
  94
  95         while ((di = readdir(d))) {
  96                 if (di == NULL || strcmp(di->d_name, ".") == 0 || strcmp(di->d_name, "..") == 0)
  97                         continue;
  98
  99                 snprintf(path, PATH_MAX, "/sys/class/input/%s/name", di->d_name);
 100
 101                 fd = open(path, O_RDONLY);
 102                 if (fd < 0)
 103                         continue;
 104
 105                 read(fd, &input_name, sizeof(input_name));
 106                 close(fd);
 107
 108                 if (strncmp(input_name, name, strlen(name)) == 0) {
 109                         snprintf(path_prefix, PATH_MAX, "/sys/class/input/%s", di->d_name);
 110                         return 0;
 111                 }
 112         }
 113
 114         return -1;
 115 }