tools/iio/iio_event_monitor.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Industrialio event test code.
   3  *
   4  * Copyright (c) 2011-2012 Lars-Peter Clausen <lars@metafoo.de>
   5  *
   6  * This program is primarily intended as an example application.
   7  * Reads the current buffer setup from sysfs and starts a short capture
   8  * from the specified device, pretty printing the result after appropriate
   9  * conversion.
  10  *
  11  * Usage:
  12  *      iio_event_monitor <device_name>
  13  */
  14
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <stdbool.h>
  18 #include <stdio.h>
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <poll.h>
  22 #include <fcntl.h>
  23 #include <sys/ioctl.h>
  24 #include "iio_utils.h"
  25 #include <linux/iio/events.h>
  26 #include <linux/iio/types.h>
  27
  28 static const char * const iio_chan_type_name_spec[] = {
  29         [IIO_VOLTAGE] = "voltage",
  30         [IIO_CURRENT] = "current",
  31         [IIO_POWER] = "power",
  32         [IIO_ACCEL] = "accel",
  33         [IIO_ANGL_VEL] = "anglvel",
  34         [IIO_MAGN] = "magn",
  35         [IIO_LIGHT] = "illuminance",
  36         [IIO_INTENSITY] = "intensity",
  37         [IIO_PROXIMITY] = "proximity",
  38         [IIO_TEMP] = "temp",
  39         [IIO_INCLI] = "incli",
  40         [IIO_ROT] = "rot",
  41         [IIO_ANGL] = "angl",
  42         [IIO_TIMESTAMP] = "timestamp",
  43         [IIO_CAPACITANCE] = "capacitance",
  44         [IIO_ALTVOLTAGE] = "altvoltage",
  45         [IIO_CCT] = "cct",
  46         [IIO_PRESSURE] = "pressure",
  47         [IIO_HUMIDITYRELATIVE] = "humidityrelative",
  48         [IIO_ACTIVITY] = "activity",
  49         [IIO_STEPS] = "steps",
  50         [IIO_ENERGY] = "energy",
  51         [IIO_DISTANCE] = "distance",
  52         [IIO_VELOCITY] = "velocity",
  53         [IIO_CONCENTRATION] = "concentration",
  54         [IIO_RESISTANCE] = "resistance",
  55         [IIO_PH] = "ph",
  56         [IIO_UVINDEX] = "uvindex",
  57         [IIO_GRAVITY] = "gravity",
  58         [IIO_POSITIONRELATIVE] = "positionrelative",
  59         [IIO_PHASE] = "phase",
  60         [IIO_MASSCONCENTRATION] = "massconcentration",
  61 };
  62
  63 static const char * const iio_ev_type_text[] = {
  64         [IIO_EV_TYPE_THRESH] = "thresh",
  65         [IIO_EV_TYPE_MAG] = "mag",
  66         [IIO_EV_TYPE_ROC] = "roc",
  67         [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
  68         [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
  69         [IIO_EV_TYPE_CHANGE] = "change",
  70 };
  71
  72 static const char * const iio_ev_dir_text[] = {
  73         [IIO_EV_DIR_EITHER] = "either",
  74         [IIO_EV_DIR_RISING] = "rising",
  75         [IIO_EV_DIR_FALLING] = "falling"
  76 };
  77
  78 static const char * const iio_modifier_names[] = {
  79         [IIO_MOD_X] = "x",
  80         [IIO_MOD_Y] = "y",
  81         [IIO_MOD_Z] = "z",
  82         [IIO_MOD_X_AND_Y] = "x&y",
  83         [IIO_MOD_X_AND_Z] = "x&z",
  84         [IIO_MOD_Y_AND_Z] = "y&z",
  85         [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
  86         [IIO_MOD_X_OR_Y] = "x|y",
  87         [IIO_MOD_X_OR_Z] = "x|z",
  88         [IIO_MOD_Y_OR_Z] = "y|z",
  89         [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
  90         [IIO_MOD_LIGHT_BOTH] = "both",
  91         [IIO_MOD_LIGHT_IR] = "ir",
  92         [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
  93         [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
  94         [IIO_MOD_LIGHT_CLEAR] = "clear",
  95         [IIO_MOD_LIGHT_RED] = "red",
  96         [IIO_MOD_LIGHT_GREEN] = "green",
  97         [IIO_MOD_LIGHT_BLUE] = "blue",
  98         [IIO_MOD_LIGHT_UV] = "uv",
  99         [IIO_MOD_LIGHT_DUV] = "duv",
 100         [IIO_MOD_QUATERNION] = "quaternion",
 101         [IIO_MOD_TEMP_AMBIENT] = "ambient",
 102         [IIO_MOD_TEMP_OBJECT] = "object",
 103         [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
 104         [IIO_MOD_NORTH_TRUE] = "from_north_true",
 105         [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
 106         [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
 107         [IIO_MOD_RUNNING] = "running",
 108         [IIO_MOD_JOGGING] = "jogging",
 109         [IIO_MOD_WALKING] = "walking",
 110         [IIO_MOD_STILL] = "still",
 111         [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
 112         [IIO_MOD_I] = "i",
 113         [IIO_MOD_Q] = "q",
 114         [IIO_MOD_CO2] = "co2",
 115         [IIO_MOD_ETHANOL] = "ethanol",
 116         [IIO_MOD_H2] = "h2",
 117         [IIO_MOD_VOC] = "voc",
 118         [IIO_MOD_PM1] = "pm1",
 119         [IIO_MOD_PM2P5] = "pm2p5",
 120         [IIO_MOD_PM4] = "pm4",
 121         [IIO_MOD_PM10] = "pm10",
 122         [IIO_MOD_O2] = "o2",
 123 };
 124
 125 static bool event_is_known(struct iio_event_data *event)
 126 {
 127         enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
 128         enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
 129         enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
 130         enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
 131
 132         switch (type) {
 133         case IIO_VOLTAGE:
 134         case IIO_CURRENT:
 135         case IIO_POWER:
 136         case IIO_ACCEL:
 137         case IIO_ANGL_VEL:
 138         case IIO_MAGN:
 139         case IIO_LIGHT:
 140         case IIO_INTENSITY:
 141         case IIO_PROXIMITY:
 142         case IIO_TEMP:
 143         case IIO_INCLI:
 144         case IIO_ROT:
 145         case IIO_ANGL:
 146         case IIO_TIMESTAMP:
 147         case IIO_CAPACITANCE:
 148         case IIO_ALTVOLTAGE:
 149         case IIO_CCT:
 150         case IIO_PRESSURE:
 151         case IIO_HUMIDITYRELATIVE:
 152         case IIO_ACTIVITY:
 153         case IIO_STEPS:
 154         case IIO_ENERGY:
 155         case IIO_DISTANCE:
 156         case IIO_VELOCITY:
 157         case IIO_CONCENTRATION:
 158         case IIO_RESISTANCE:
 159         case IIO_PH:
 160         case IIO_UVINDEX:
 161         case IIO_GRAVITY:
 162         case IIO_POSITIONRELATIVE:
 163         case IIO_PHASE:
 164         case IIO_MASSCONCENTRATION:
 165                 break;
 166         default:
 167                 return false;
 168         }
 169
 170         switch (mod) {
 171         case IIO_NO_MOD:
 172         case IIO_MOD_X:
 173         case IIO_MOD_Y:
 174         case IIO_MOD_Z:
 175         case IIO_MOD_X_AND_Y:
 176         case IIO_MOD_X_AND_Z:
 177         case IIO_MOD_Y_AND_Z:
 178         case IIO_MOD_X_AND_Y_AND_Z:
 179         case IIO_MOD_X_OR_Y:
 180         case IIO_MOD_X_OR_Z:
 181         case IIO_MOD_Y_OR_Z:
 182         case IIO_MOD_X_OR_Y_OR_Z:
 183         case IIO_MOD_LIGHT_BOTH:
 184         case IIO_MOD_LIGHT_IR:
 185         case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
 186         case IIO_MOD_SUM_SQUARED_X_Y_Z:
 187         case IIO_MOD_LIGHT_CLEAR:
 188         case IIO_MOD_LIGHT_RED:
 189         case IIO_MOD_LIGHT_GREEN:
 190         case IIO_MOD_LIGHT_BLUE:
 191         case IIO_MOD_LIGHT_UV:
 192         case IIO_MOD_LIGHT_DUV:
 193         case IIO_MOD_QUATERNION:
 194         case IIO_MOD_TEMP_AMBIENT:
 195         case IIO_MOD_TEMP_OBJECT:
 196         case IIO_MOD_NORTH_MAGN:
 197         case IIO_MOD_NORTH_TRUE:
 198         case IIO_MOD_NORTH_MAGN_TILT_COMP:
 199         case IIO_MOD_NORTH_TRUE_TILT_COMP:
 200         case IIO_MOD_RUNNING:
 201         case IIO_MOD_JOGGING:
 202         case IIO_MOD_WALKING:
 203         case IIO_MOD_STILL:
 204         case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
 205         case IIO_MOD_I:
 206         case IIO_MOD_Q:
 207         case IIO_MOD_CO2:
 208         case IIO_MOD_ETHANOL:
 209         case IIO_MOD_H2:
 210         case IIO_MOD_VOC:
 211         case IIO_MOD_PM1:
 212         case IIO_MOD_PM2P5:
 213         case IIO_MOD_PM4:
 214         case IIO_MOD_PM10:
 215         case IIO_MOD_O2:
 216                 break;
 217         default:
 218                 return false;
 219         }
 220
 221         switch (ev_type) {
 222         case IIO_EV_TYPE_THRESH:
 223         case IIO_EV_TYPE_MAG:
 224         case IIO_EV_TYPE_ROC:
 225         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 226         case IIO_EV_TYPE_MAG_ADAPTIVE:
 227         case IIO_EV_TYPE_CHANGE:
 228                 break;
 229         default:
 230                 return false;
 231         }
 232
 233         switch (dir) {
 234         case IIO_EV_DIR_EITHER:
 235         case IIO_EV_DIR_RISING:
 236         case IIO_EV_DIR_FALLING:
 237         case IIO_EV_DIR_NONE:
 238                 break;
 239         default:
 240                 return false;
 241         }
 242
 243         return true;
 244 }
 245
 246 static void print_event(struct iio_event_data *event)
 247 {
 248         enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
 249         enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
 250         enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
 251         enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
 252         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
 253         int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
 254         bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
 255
 256         if (!event_is_known(event)) {
 257                 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
 258                         event->timestamp, event->id);
 259
 260                 return;
 261         }
 262
 263         printf("Event: time: %lld, type: %s", event->timestamp,
 264                iio_chan_type_name_spec[type]);
 265
 266         if (mod != IIO_NO_MOD)
 267                 printf("(%s)", iio_modifier_names[mod]);
 268
 269         if (chan >= 0) {
 270                 printf(", channel: %d", chan);
 271                 if (diff && chan2 >= 0)
 272                         printf("-%d", chan2);
 273         }
 274
 275         printf(", evtype: %s", iio_ev_type_text[ev_type]);
 276
 277         if (dir != IIO_EV_DIR_NONE)
 278                 printf(", direction: %s", iio_ev_dir_text[dir]);
 279
 280         printf("\n");
 281 }
 282
 283 int main(int argc, char **argv)
 284 {
 285         struct iio_event_data event;
 286         const char *device_name;
 287         char *chrdev_name;
 288         int ret;
 289         int dev_num;
 290         int fd, event_fd;
 291
 292         if (argc <= 1) {
 293                 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
 294                 return -1;
 295         }
 296
 297         device_name = argv[1];
 298
 299         dev_num = find_type_by_name(device_name, "iio:device");
 300         if (dev_num >= 0) {
 301                 printf("Found IIO device with name %s with device number %d\n",
 302                        device_name, dev_num);
 303                 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
 304                 if (ret < 0)
 305                         return -ENOMEM;
 306         } else {
 307                 /*
 308                  * If we can't find an IIO device by name assume device_name is
 309                  * an IIO chrdev
 310                  */
 311                 chrdev_name = strdup(device_name);
 312                 if (!chrdev_name)
 313                         return -ENOMEM;
 314         }
 315
 316         fd = open(chrdev_name, 0);
 317         if (fd == -1) {
 318                 ret = -errno;
 319                 fprintf(stderr, "Failed to open %s\n", chrdev_name);
 320                 goto error_free_chrdev_name;
 321         }
 322
 323         ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
 324         if (ret == -1 || event_fd == -1) {
 325                 ret = -errno;
 326                 if (ret == -ENODEV)
 327                         fprintf(stderr,
 328                                 "This device does not support events\n");
 329                 else
 330                         fprintf(stderr, "Failed to retrieve event fd\n");
 331                 if (close(fd) == -1)
 332                         perror("Failed to close character device file");
 333
 334                 goto error_free_chrdev_name;
 335         }
 336
 337         if (close(fd) == -1)  {
 338                 ret = -errno;
 339                 goto error_free_chrdev_name;
 340         }
 341
 342         while (true) {
 343                 ret = read(event_fd, &event, sizeof(event));
 344                 if (ret == -1) {
 345                         if (errno == EAGAIN) {
 346                                 fprintf(stderr, "nothing available\n");
 347                                 continue;
 348                         } else {
 349                                 ret = -errno;
 350                                 perror("Failed to read event from device");
 351                                 break;
 352                         }
 353                 }
 354
 355                 if (ret != sizeof(event)) {
 356                         fprintf(stderr, "Reading event failed!\n");
 357                         ret = -EIO;
 358                         break;
 359                 }
 360
 361                 print_event(&event);
 362         }
 363
 364         if (close(event_fd) == -1)
 365                 perror("Failed to close event file");
 366
 367 error_free_chrdev_name:
 368         free(chrdev_name);
 369
 370         return ret;
 371 }