tools/iio/iio_event_monitor.c

   1 /* Industrialio event test code.
   2  *
   3  * Copyright (c) 2011-2012 Lars-Peter Clausen <lars@metafoo.de>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is primarily intended as an example application.
  10  * Reads the current buffer setup from sysfs and starts a short capture
  11  * from the specified device, pretty printing the result after appropriate
  12  * conversion.
  13  *
  14  * Usage:
  15  *      iio_event_monitor <device_name>
  16  */
  17
  18 #include <unistd.h>
  19 #include <stdlib.h>
  20 #include <stdbool.h>
  21 #include <stdio.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <poll.h>
  25 #include <fcntl.h>
  26 #include <sys/ioctl.h>
  27 #include "iio_utils.h"
  28 #include <linux/iio/events.h>
  29 #include <linux/iio/types.h>
  30
  31 static const char * const iio_chan_type_name_spec[] = {
  32         [IIO_VOLTAGE] = "voltage",
  33         [IIO_CURRENT] = "current",
  34         [IIO_POWER] = "power",
  35         [IIO_ACCEL] = "accel",
  36         [IIO_ANGL_VEL] = "anglvel",
  37         [IIO_MAGN] = "magn",
  38         [IIO_LIGHT] = "illuminance",
  39         [IIO_INTENSITY] = "intensity",
  40         [IIO_PROXIMITY] = "proximity",
  41         [IIO_TEMP] = "temp",
  42         [IIO_INCLI] = "incli",
  43         [IIO_ROT] = "rot",
  44         [IIO_ANGL] = "angl",
  45         [IIO_TIMESTAMP] = "timestamp",
  46         [IIO_CAPACITANCE] = "capacitance",
  47         [IIO_ALTVOLTAGE] = "altvoltage",
  48         [IIO_CCT] = "cct",
  49         [IIO_PRESSURE] = "pressure",
  50         [IIO_HUMIDITYRELATIVE] = "humidityrelative",
  51         [IIO_ACTIVITY] = "activity",
  52         [IIO_STEPS] = "steps",
  53         [IIO_ENERGY] = "energy",
  54         [IIO_DISTANCE] = "distance",
  55         [IIO_VELOCITY] = "velocity",
  56 };
  57
  58 static const char * const iio_ev_type_text[] = {
  59         [IIO_EV_TYPE_THRESH] = "thresh",
  60         [IIO_EV_TYPE_MAG] = "mag",
  61         [IIO_EV_TYPE_ROC] = "roc",
  62         [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
  63         [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
  64         [IIO_EV_TYPE_CHANGE] = "change",
  65 };
  66
  67 static const char * const iio_ev_dir_text[] = {
  68         [IIO_EV_DIR_EITHER] = "either",
  69         [IIO_EV_DIR_RISING] = "rising",
  70         [IIO_EV_DIR_FALLING] = "falling"
  71 };
  72
  73 static const char * const iio_modifier_names[] = {
  74         [IIO_MOD_X] = "x",
  75         [IIO_MOD_Y] = "y",
  76         [IIO_MOD_Z] = "z",
  77         [IIO_MOD_X_AND_Y] = "x&y",
  78         [IIO_MOD_X_AND_Z] = "x&z",
  79         [IIO_MOD_Y_AND_Z] = "y&z",
  80         [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
  81         [IIO_MOD_X_OR_Y] = "x|y",
  82         [IIO_MOD_X_OR_Z] = "x|z",
  83         [IIO_MOD_Y_OR_Z] = "y|z",
  84         [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
  85         [IIO_MOD_LIGHT_BOTH] = "both",
  86         [IIO_MOD_LIGHT_IR] = "ir",
  87         [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
  88         [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
  89         [IIO_MOD_LIGHT_CLEAR] = "clear",
  90         [IIO_MOD_LIGHT_RED] = "red",
  91         [IIO_MOD_LIGHT_GREEN] = "green",
  92         [IIO_MOD_LIGHT_BLUE] = "blue",
  93         [IIO_MOD_QUATERNION] = "quaternion",
  94         [IIO_MOD_TEMP_AMBIENT] = "ambient",
  95         [IIO_MOD_TEMP_OBJECT] = "object",
  96         [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
  97         [IIO_MOD_NORTH_TRUE] = "from_north_true",
  98         [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
  99         [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
 100         [IIO_MOD_RUNNING] = "running",
 101         [IIO_MOD_JOGGING] = "jogging",
 102         [IIO_MOD_WALKING] = "walking",
 103         [IIO_MOD_STILL] = "still",
 104         [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
 105 };
 106
 107 static bool event_is_known(struct iio_event_data *event)
 108 {
 109         enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
 110         enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
 111         enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
 112         enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
 113
 114         switch (type) {
 115         case IIO_VOLTAGE:
 116         case IIO_CURRENT:
 117         case IIO_POWER:
 118         case IIO_ACCEL:
 119         case IIO_ANGL_VEL:
 120         case IIO_MAGN:
 121         case IIO_LIGHT:
 122         case IIO_INTENSITY:
 123         case IIO_PROXIMITY:
 124         case IIO_TEMP:
 125         case IIO_INCLI:
 126         case IIO_ROT:
 127         case IIO_ANGL:
 128         case IIO_TIMESTAMP:
 129         case IIO_CAPACITANCE:
 130         case IIO_ALTVOLTAGE:
 131         case IIO_CCT:
 132         case IIO_PRESSURE:
 133         case IIO_HUMIDITYRELATIVE:
 134         case IIO_ACTIVITY:
 135         case IIO_STEPS:
 136         case IIO_ENERGY:
 137         case IIO_DISTANCE:
 138         case IIO_VELOCITY:
 139                 break;
 140         default:
 141                 return false;
 142         }
 143
 144         switch (mod) {
 145         case IIO_NO_MOD:
 146         case IIO_MOD_X:
 147         case IIO_MOD_Y:
 148         case IIO_MOD_Z:
 149         case IIO_MOD_X_AND_Y:
 150         case IIO_MOD_X_AND_Z:
 151         case IIO_MOD_Y_AND_Z:
 152         case IIO_MOD_X_AND_Y_AND_Z:
 153         case IIO_MOD_X_OR_Y:
 154         case IIO_MOD_X_OR_Z:
 155         case IIO_MOD_Y_OR_Z:
 156         case IIO_MOD_X_OR_Y_OR_Z:
 157         case IIO_MOD_LIGHT_BOTH:
 158         case IIO_MOD_LIGHT_IR:
 159         case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
 160         case IIO_MOD_SUM_SQUARED_X_Y_Z:
 161         case IIO_MOD_LIGHT_CLEAR:
 162         case IIO_MOD_LIGHT_RED:
 163         case IIO_MOD_LIGHT_GREEN:
 164         case IIO_MOD_LIGHT_BLUE:
 165         case IIO_MOD_QUATERNION:
 166         case IIO_MOD_TEMP_AMBIENT:
 167         case IIO_MOD_TEMP_OBJECT:
 168         case IIO_MOD_NORTH_MAGN:
 169         case IIO_MOD_NORTH_TRUE:
 170         case IIO_MOD_NORTH_MAGN_TILT_COMP:
 171         case IIO_MOD_NORTH_TRUE_TILT_COMP:
 172         case IIO_MOD_RUNNING:
 173         case IIO_MOD_JOGGING:
 174         case IIO_MOD_WALKING:
 175         case IIO_MOD_STILL:
 176         case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
 177                 break;
 178         default:
 179                 return false;
 180         }
 181
 182         switch (ev_type) {
 183         case IIO_EV_TYPE_THRESH:
 184         case IIO_EV_TYPE_MAG:
 185         case IIO_EV_TYPE_ROC:
 186         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 187         case IIO_EV_TYPE_MAG_ADAPTIVE:
 188         case IIO_EV_TYPE_CHANGE:
 189                 break;
 190         default:
 191                 return false;
 192         }
 193
 194         switch (dir) {
 195         case IIO_EV_DIR_EITHER:
 196         case IIO_EV_DIR_RISING:
 197         case IIO_EV_DIR_FALLING:
 198         case IIO_EV_DIR_NONE:
 199                 break;
 200         default:
 201                 return false;
 202         }
 203
 204         return true;
 205 }
 206
 207 static void print_event(struct iio_event_data *event)
 208 {
 209         enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
 210         enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
 211         enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
 212         enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
 213         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
 214         int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
 215         bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
 216
 217         if (!event_is_known(event)) {
 218                 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
 219                         event->timestamp, event->id);
 220
 221                 return;
 222         }
 223
 224         printf("Event: time: %lld, type: %s", event->timestamp,
 225                iio_chan_type_name_spec[type]);
 226
 227         if (mod != IIO_NO_MOD)
 228                 printf("(%s)", iio_modifier_names[mod]);
 229
 230         if (chan >= 0) {
 231                 printf(", channel: %d", chan);
 232                 if (diff && chan2 >= 0)
 233                         printf("-%d", chan2);
 234         }
 235
 236         printf(", evtype: %s", iio_ev_type_text[ev_type]);
 237
 238         if (dir != IIO_EV_DIR_NONE)
 239                 printf(", direction: %s", iio_ev_dir_text[dir]);
 240
 241         printf("\n");
 242 }
 243
 244 int main(int argc, char **argv)
 245 {
 246         struct iio_event_data event;
 247         const char *device_name;
 248         char *chrdev_name;
 249         int ret;
 250         int dev_num;
 251         int fd, event_fd;
 252
 253         if (argc <= 1) {
 254                 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
 255                 return -1;
 256         }
 257
 258         device_name = argv[1];
 259
 260         dev_num = find_type_by_name(device_name, "iio:device");
 261         if (dev_num >= 0) {
 262                 printf("Found IIO device with name %s with device number %d\n",
 263                        device_name, dev_num);
 264                 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
 265                 if (ret < 0)
 266                         return -ENOMEM;
 267         } else {
 268                 /*
 269                  * If we can't find an IIO device by name assume device_name is
 270                  * an IIO chrdev
 271                  */
 272                 chrdev_name = strdup(device_name);
 273                 if (!chrdev_name)
 274                         return -ENOMEM;
 275         }
 276
 277         fd = open(chrdev_name, 0);
 278         if (fd == -1) {
 279                 ret = -errno;
 280                 fprintf(stderr, "Failed to open %s\n", chrdev_name);
 281                 goto error_free_chrdev_name;
 282         }
 283
 284         ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
 285         if (ret == -1 || event_fd == -1) {
 286                 ret = -errno;
 287                 if (ret == -ENODEV)
 288                         fprintf(stderr,
 289                                 "This device does not support events\n");
 290                 else
 291                         fprintf(stderr, "Failed to retrieve event fd\n");
 292                 if (close(fd) == -1)
 293                         perror("Failed to close character device file");
 294
 295                 goto error_free_chrdev_name;
 296         }
 297
 298         if (close(fd) == -1)  {
 299                 ret = -errno;
 300                 goto error_free_chrdev_name;
 301         }
 302
 303         while (true) {
 304                 ret = read(event_fd, &event, sizeof(event));
 305                 if (ret == -1) {
 306                         if (errno == EAGAIN) {
 307                                 fprintf(stderr, "nothing available\n");
 308                                 continue;
 309                         } else {
 310                                 ret = -errno;
 311                                 perror("Failed to read event from device");
 312                                 break;
 313                         }
 314                 }
 315
 316                 if (ret != sizeof(event)) {
 317                         fprintf(stderr, "Reading event failed!\n");
 318                         ret = -EIO;
 319                         break;
 320                 }
 321
 322                 print_event(&event);
 323         }
 324
 325         if (close(event_fd) == -1)
 326                 perror("Failed to close event file");
 327
 328 error_free_chrdev_name:
 329         free(chrdev_name);
 330
 331         return ret;
 332 }