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