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         [IIO_CONCENTRATION] = "concentration",
  57         [IIO_RESISTANCE] = "resistance",
  58         [IIO_PH] = "ph",
  59         [IIO_UVINDEX] = "uvindex",
  60         [IIO_GRAVITY] = "gravity",
  61         [IIO_POSITIONRELATIVE] = "positionrelative",
  62         [IIO_PHASE] = "phase",
  63         [IIO_MASSCONCENTRATION] = "massconcentration",
  64 };
  65
  66 static const char * const iio_ev_type_text[] = {
  67         [IIO_EV_TYPE_THRESH] = "thresh",
  68         [IIO_EV_TYPE_MAG] = "mag",
  69         [IIO_EV_TYPE_ROC] = "roc",
  70         [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
  71         [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
  72         [IIO_EV_TYPE_CHANGE] = "change",
  73 };
  74
  75 static const char * const iio_ev_dir_text[] = {
  76         [IIO_EV_DIR_EITHER] = "either",
  77         [IIO_EV_DIR_RISING] = "rising",
  78         [IIO_EV_DIR_FALLING] = "falling"
  79 };
  80
  81 static const char * const iio_modifier_names[] = {
  82         [IIO_MOD_X] = "x",
  83         [IIO_MOD_Y] = "y",
  84         [IIO_MOD_Z] = "z",
  85         [IIO_MOD_X_AND_Y] = "x&y",
  86         [IIO_MOD_X_AND_Z] = "x&z",
  87         [IIO_MOD_Y_AND_Z] = "y&z",
  88         [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
  89         [IIO_MOD_X_OR_Y] = "x|y",
  90         [IIO_MOD_X_OR_Z] = "x|z",
  91         [IIO_MOD_Y_OR_Z] = "y|z",
  92         [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
  93         [IIO_MOD_LIGHT_BOTH] = "both",
  94         [IIO_MOD_LIGHT_IR] = "ir",
  95         [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
  96         [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
  97         [IIO_MOD_LIGHT_CLEAR] = "clear",
  98         [IIO_MOD_LIGHT_RED] = "red",
  99         [IIO_MOD_LIGHT_GREEN] = "green",
 100         [IIO_MOD_LIGHT_BLUE] = "blue",
 101         [IIO_MOD_LIGHT_UV] = "uv",
 102         [IIO_MOD_LIGHT_DUV] = "duv",
 103         [IIO_MOD_QUATERNION] = "quaternion",
 104         [IIO_MOD_TEMP_AMBIENT] = "ambient",
 105         [IIO_MOD_TEMP_OBJECT] = "object",
 106         [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
 107         [IIO_MOD_NORTH_TRUE] = "from_north_true",
 108         [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
 109         [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
 110         [IIO_MOD_RUNNING] = "running",
 111         [IIO_MOD_JOGGING] = "jogging",
 112         [IIO_MOD_WALKING] = "walking",
 113         [IIO_MOD_STILL] = "still",
 114         [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
 115         [IIO_MOD_I] = "i",
 116         [IIO_MOD_Q] = "q",
 117         [IIO_MOD_CO2] = "co2",
 118         [IIO_MOD_ETHANOL] = "ethanol",
 119         [IIO_MOD_H2] = "h2",
 120         [IIO_MOD_VOC] = "voc",
 121         [IIO_MOD_PM1] = "pm1",
 122         [IIO_MOD_PM2P5] = "pm2p5",
 123         [IIO_MOD_PM4] = "pm4",
 124         [IIO_MOD_PM10] = "pm10",
 125 };
 126
 127 static bool event_is_known(struct iio_event_data *event)
 128 {
 129         enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
 130         enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
 131         enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
 132         enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
 133
 134         switch (type) {
 135         case IIO_VOLTAGE:
 136         case IIO_CURRENT:
 137         case IIO_POWER:
 138         case IIO_ACCEL:
 139         case IIO_ANGL_VEL:
 140         case IIO_MAGN:
 141         case IIO_LIGHT:
 142         case IIO_INTENSITY:
 143         case IIO_PROXIMITY:
 144         case IIO_TEMP:
 145         case IIO_INCLI:
 146         case IIO_ROT:
 147         case IIO_ANGL:
 148         case IIO_TIMESTAMP:
 149         case IIO_CAPACITANCE:
 150         case IIO_ALTVOLTAGE:
 151         case IIO_CCT:
 152         case IIO_PRESSURE:
 153         case IIO_HUMIDITYRELATIVE:
 154         case IIO_ACTIVITY:
 155         case IIO_STEPS:
 156         case IIO_ENERGY:
 157         case IIO_DISTANCE:
 158         case IIO_VELOCITY:
 159         case IIO_CONCENTRATION:
 160         case IIO_RESISTANCE:
 161         case IIO_PH:
 162         case IIO_UVINDEX:
 163         case IIO_GRAVITY:
 164         case IIO_POSITIONRELATIVE:
 165         case IIO_PHASE:
 166         case IIO_MASSCONCENTRATION:
 167                 break;
 168         default:
 169                 return false;
 170         }
 171
 172         switch (mod) {
 173         case IIO_NO_MOD:
 174         case IIO_MOD_X:
 175         case IIO_MOD_Y:
 176         case IIO_MOD_Z:
 177         case IIO_MOD_X_AND_Y:
 178         case IIO_MOD_X_AND_Z:
 179         case IIO_MOD_Y_AND_Z:
 180         case IIO_MOD_X_AND_Y_AND_Z:
 181         case IIO_MOD_X_OR_Y:
 182         case IIO_MOD_X_OR_Z:
 183         case IIO_MOD_Y_OR_Z:
 184         case IIO_MOD_X_OR_Y_OR_Z:
 185         case IIO_MOD_LIGHT_BOTH:
 186         case IIO_MOD_LIGHT_IR:
 187         case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
 188         case IIO_MOD_SUM_SQUARED_X_Y_Z:
 189         case IIO_MOD_LIGHT_CLEAR:
 190         case IIO_MOD_LIGHT_RED:
 191         case IIO_MOD_LIGHT_GREEN:
 192         case IIO_MOD_LIGHT_BLUE:
 193         case IIO_MOD_LIGHT_UV:
 194         case IIO_MOD_LIGHT_DUV:
 195         case IIO_MOD_QUATERNION:
 196         case IIO_MOD_TEMP_AMBIENT:
 197         case IIO_MOD_TEMP_OBJECT:
 198         case IIO_MOD_NORTH_MAGN:
 199         case IIO_MOD_NORTH_TRUE:
 200         case IIO_MOD_NORTH_MAGN_TILT_COMP:
 201         case IIO_MOD_NORTH_TRUE_TILT_COMP:
 202         case IIO_MOD_RUNNING:
 203         case IIO_MOD_JOGGING:
 204         case IIO_MOD_WALKING:
 205         case IIO_MOD_STILL:
 206         case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
 207         case IIO_MOD_I:
 208         case IIO_MOD_Q:
 209         case IIO_MOD_CO2:
 210         case IIO_MOD_ETHANOL:
 211         case IIO_MOD_H2:
 212         case IIO_MOD_VOC:
 213         case IIO_MOD_PM1:
 214         case IIO_MOD_PM2P5:
 215         case IIO_MOD_PM4:
 216         case IIO_MOD_PM10:
 217                 break;
 218         default:
 219                 return false;
 220         }
 221
 222         switch (ev_type) {
 223         case IIO_EV_TYPE_THRESH:
 224         case IIO_EV_TYPE_MAG:
 225         case IIO_EV_TYPE_ROC:
 226         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 227         case IIO_EV_TYPE_MAG_ADAPTIVE:
 228         case IIO_EV_TYPE_CHANGE:
 229                 break;
 230         default:
 231                 return false;
 232         }
 233
 234         switch (dir) {
 235         case IIO_EV_DIR_EITHER:
 236         case IIO_EV_DIR_RISING:
 237         case IIO_EV_DIR_FALLING:
 238         case IIO_EV_DIR_NONE:
 239                 break;
 240         default:
 241                 return false;
 242         }
 243
 244         return true;
 245 }
 246
 247 static void print_event(struct iio_event_data *event)
 248 {
 249         enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
 250         enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
 251         enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
 252         enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
 253         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
 254         int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
 255         bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
 256
 257         if (!event_is_known(event)) {
 258                 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
 259                         event->timestamp, event->id);
 260
 261                 return;
 262         }
 263
 264         printf("Event: time: %lld, type: %s", event->timestamp,
 265                iio_chan_type_name_spec[type]);
 266
 267         if (mod != IIO_NO_MOD)
 268                 printf("(%s)", iio_modifier_names[mod]);
 269
 270         if (chan >= 0) {
 271                 printf(", channel: %d", chan);
 272                 if (diff && chan2 >= 0)
 273                         printf("-%d", chan2);
 274         }
 275
 276         printf(", evtype: %s", iio_ev_type_text[ev_type]);
 277
 278         if (dir != IIO_EV_DIR_NONE)
 279                 printf(", direction: %s", iio_ev_dir_text[dir]);
 280
 281         printf("\n");
 282 }
 283
 284 int main(int argc, char **argv)
 285 {
 286         struct iio_event_data event;
 287         const char *device_name;
 288         char *chrdev_name;
 289         int ret;
 290         int dev_num;
 291         int fd, event_fd;
 292
 293         if (argc <= 1) {
 294                 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
 295                 return -1;
 296         }
 297
 298         device_name = argv[1];
 299
 300         dev_num = find_type_by_name(device_name, "iio:device");
 301         if (dev_num >= 0) {
 302                 printf("Found IIO device with name %s with device number %d\n",
 303                        device_name, dev_num);
 304                 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
 305                 if (ret < 0)
 306                         return -ENOMEM;
 307         } else {
 308                 /*
 309                  * If we can't find an IIO device by name assume device_name is
 310                  * an IIO chrdev
 311                  */
 312                 chrdev_name = strdup(device_name);
 313                 if (!chrdev_name)
 314                         return -ENOMEM;
 315         }
 316
 317         fd = open(chrdev_name, 0);
 318         if (fd == -1) {
 319                 ret = -errno;
 320                 fprintf(stderr, "Failed to open %s\n", chrdev_name);
 321                 goto error_free_chrdev_name;
 322         }
 323
 324         ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
 325         if (ret == -1 || event_fd == -1) {
 326                 ret = -errno;
 327                 if (ret == -ENODEV)
 328                         fprintf(stderr,
 329                                 "This device does not support events\n");
 330                 else
 331                         fprintf(stderr, "Failed to retrieve event fd\n");
 332                 if (close(fd) == -1)
 333                         perror("Failed to close character device file");
 334
 335                 goto error_free_chrdev_name;
 336         }
 337
 338         if (close(fd) == -1)  {
 339                 ret = -errno;
 340                 goto error_free_chrdev_name;
 341         }
 342
 343         while (true) {
 344                 ret = read(event_fd, &event, sizeof(event));
 345                 if (ret == -1) {
 346                         if (errno == EAGAIN) {
 347                                 fprintf(stderr, "nothing available\n");
 348                                 continue;
 349                         } else {
 350                                 ret = -errno;
 351                                 perror("Failed to read event from device");
 352                                 break;
 353                         }
 354                 }
 355
 356                 if (ret != sizeof(event)) {
 357                         fprintf(stderr, "Reading event failed!\n");
 358                         ret = -EIO;
 359                         break;
 360                 }
 361
 362                 print_event(&event);
 363         }
 364
 365         if (close(event_fd) == -1)
 366                 perror("Failed to close event file");
 367
 368 error_free_chrdev_name:
 369         free(chrdev_name);
 370
 371         return ret;
 372 }