tools/iio/lsiio.c

   1 /*
   2  * Industrial I/O utilities - lsiio.c
   3  *
   4  * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  */
  10
  11 #include <string.h>
  12 #include <dirent.h>
  13 #include <stdio.h>
  14 #include <errno.h>
  15 #include <stdint.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20 #include <sys/dir.h>
  21 #include "iio_utils.h"
  22
  23 static enum verbosity {
  24         VERBLEVEL_DEFAULT,      /* 0 gives lspci behaviour */
  25         VERBLEVEL_SENSORS,      /* 1 lists sensors */
  26 } verblevel = VERBLEVEL_DEFAULT;
  27
  28 const char *type_device = "iio:device";
  29 const char *type_trigger = "trigger";
  30
  31 static inline int check_prefix(const char *str, const char *prefix)
  32 {
  33         return strlen(str) > strlen(prefix) &&
  34                strncmp(str, prefix, strlen(prefix)) == 0;
  35 }
  36
  37 static inline int check_postfix(const char *str, const char *postfix)
  38 {
  39         return strlen(str) > strlen(postfix) &&
  40                strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
  41 }
  42
  43 static int dump_channels(const char *dev_dir_name)
  44 {
  45         DIR *dp;
  46         const struct dirent *ent;
  47
  48         dp = opendir(dev_dir_name);
  49         if (!dp)
  50                 return -errno;
  51
  52         while (ent = readdir(dp), ent)
  53                 if (check_prefix(ent->d_name, "in_") &&
  54                     check_postfix(ent->d_name, "_raw"))
  55                         printf("   %-10s\n", ent->d_name);
  56
  57         return (closedir(dp) == -1) ? -errno : 0;
  58 }
  59
  60 static int dump_one_device(const char *dev_dir_name)
  61 {
  62         char name[IIO_MAX_NAME_LENGTH];
  63         int dev_idx;
  64         int ret;
  65
  66         ret = sscanf(dev_dir_name + strlen(iio_dir) + strlen(type_device), "%i",
  67                      &dev_idx);
  68         if (ret != 1)
  69                 return -EINVAL;
  70
  71         ret = read_sysfs_string("name", dev_dir_name, name);
  72         if (ret < 0)
  73                 return ret;
  74
  75         printf("Device %03d: %s\n", dev_idx, name);
  76
  77         if (verblevel >= VERBLEVEL_SENSORS)
  78                 return dump_channels(dev_dir_name);
  79
  80         return 0;
  81 }
  82
  83 static int dump_one_trigger(const char *dev_dir_name)
  84 {
  85         char name[IIO_MAX_NAME_LENGTH];
  86         int dev_idx;
  87         int ret;
  88
  89         ret = sscanf(dev_dir_name + strlen(iio_dir) + strlen(type_trigger),
  90                      "%i", &dev_idx);
  91         if (ret != 1)
  92                 return -EINVAL;
  93
  94         ret = read_sysfs_string("name", dev_dir_name, name);
  95         if (ret < 0)
  96                 return ret;
  97
  98         printf("Trigger %03d: %s\n", dev_idx, name);
  99
 100         return 0;
 101 }
 102
 103 static int dump_devices(void)
 104 {
 105         const struct dirent *ent;
 106         int ret;
 107         DIR *dp;
 108
 109         dp = opendir(iio_dir);
 110         if (!dp) {
 111                 fprintf(stderr, "No industrial I/O devices available\n");
 112                 return -ENODEV;
 113         }
 114
 115         while (ent = readdir(dp), ent) {
 116                 if (check_prefix(ent->d_name, type_device)) {
 117                         char *dev_dir_name;
 118
 119                         if (asprintf(&dev_dir_name, "%s%s", iio_dir,
 120                                      ent->d_name) < 0) {
 121                                 ret = -ENOMEM;
 122                                 goto error_close_dir;
 123                         }
 124
 125                         ret = dump_one_device(dev_dir_name);
 126                         if (ret) {
 127                                 free(dev_dir_name);
 128                                 goto error_close_dir;
 129                         }
 130
 131                         free(dev_dir_name);
 132                         if (verblevel >= VERBLEVEL_SENSORS)
 133                                 printf("\n");
 134                 }
 135         }
 136         rewinddir(dp);
 137         while (ent = readdir(dp), ent) {
 138                 if (check_prefix(ent->d_name, type_trigger)) {
 139                         char *dev_dir_name;
 140
 141                         if (asprintf(&dev_dir_name, "%s%s", iio_dir,
 142                                      ent->d_name) < 0) {
 143                                 ret = -ENOMEM;
 144                                 goto error_close_dir;
 145                         }
 146
 147                         ret = dump_one_trigger(dev_dir_name);
 148                         if (ret) {
 149                                 free(dev_dir_name);
 150                                 goto error_close_dir;
 151                         }
 152
 153                         free(dev_dir_name);
 154                 }
 155         }
 156
 157         return (closedir(dp) == -1) ? -errno : 0;
 158
 159 error_close_dir:
 160         if (closedir(dp) == -1)
 161                 perror("dump_devices(): Failed to close directory");
 162
 163         return ret;
 164 }
 165
 166 int main(int argc, char **argv)
 167 {
 168         int c, err = 0;
 169
 170         while ((c = getopt(argc, argv, "v")) != EOF) {
 171                 switch (c) {
 172                 case 'v':
 173                         verblevel++;
 174                         break;
 175
 176                 case '?':
 177                 default:
 178                         err++;
 179                         break;
 180                 }
 181         }
 182         if (err || argc > optind) {
 183                 fprintf(stderr, "Usage: lsiio [options]...\n"
 184                         "List industrial I/O devices\n"
 185                         "  -v  Increase verbosity (may be given multiple times)\n");
 186                 exit(1);
 187         }
 188
 189         return dump_devices();
 190 }