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1// SPDX-License-Identifier: GPL-2.0-only2/* 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 capture8 * from the specified device, pretty printing the result after appropriate9 * conversion.10 *11 * Usage:12 * iio_event_monitor <device_name>13 */14 15#include <unistd.h>16#include <stdlib.h>17#include <dirent.h>18#include <stdbool.h>19#include <stdio.h>20#include <errno.h>21#include <string.h>22#include <poll.h>23#include <fcntl.h>24#include <sys/ioctl.h>25#include "iio_utils.h"26#include <linux/iio/events.h>27#include <linux/iio/types.h>28 29static const char * const iio_chan_type_name_spec[] = {30 [IIO_VOLTAGE] = "voltage",31 [IIO_CURRENT] = "current",32 [IIO_POWER] = "power",33 [IIO_ACCEL] = "accel",34 [IIO_ANGL_VEL] = "anglvel",35 [IIO_MAGN] = "magn",36 [IIO_LIGHT] = "illuminance",37 [IIO_INTENSITY] = "intensity",38 [IIO_PROXIMITY] = "proximity",39 [IIO_TEMP] = "temp",40 [IIO_INCLI] = "incli",41 [IIO_ROT] = "rot",42 [IIO_ANGL] = "angl",43 [IIO_TIMESTAMP] = "timestamp",44 [IIO_CAPACITANCE] = "capacitance",45 [IIO_ALTVOLTAGE] = "altvoltage",46 [IIO_CCT] = "cct",47 [IIO_PRESSURE] = "pressure",48 [IIO_HUMIDITYRELATIVE] = "humidityrelative",49 [IIO_ACTIVITY] = "activity",50 [IIO_STEPS] = "steps",51 [IIO_ENERGY] = "energy",52 [IIO_DISTANCE] = "distance",53 [IIO_VELOCITY] = "velocity",54 [IIO_CONCENTRATION] = "concentration",55 [IIO_RESISTANCE] = "resistance",56 [IIO_PH] = "ph",57 [IIO_UVINDEX] = "uvindex",58 [IIO_GRAVITY] = "gravity",59 [IIO_POSITIONRELATIVE] = "positionrelative",60 [IIO_PHASE] = "phase",61 [IIO_MASSCONCENTRATION] = "massconcentration",62 [IIO_DELTA_ANGL] = "deltaangl",63 [IIO_DELTA_VELOCITY] = "deltavelocity",64 [IIO_COLORTEMP] = "colortemp",65 [IIO_CHROMATICITY] = "chromaticity",66};67 68static const char * const iio_ev_type_text[] = {69 [IIO_EV_TYPE_THRESH] = "thresh",70 [IIO_EV_TYPE_MAG] = "mag",71 [IIO_EV_TYPE_ROC] = "roc",72 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",73 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",74 [IIO_EV_TYPE_CHANGE] = "change",75 [IIO_EV_TYPE_MAG_REFERENCED] = "mag_referenced",76 [IIO_EV_TYPE_GESTURE] = "gesture",77};78 79static const char * const iio_ev_dir_text[] = {80 [IIO_EV_DIR_EITHER] = "either",81 [IIO_EV_DIR_RISING] = "rising",82 [IIO_EV_DIR_FALLING] = "falling",83 [IIO_EV_DIR_SINGLETAP] = "singletap",84 [IIO_EV_DIR_DOUBLETAP] = "doubletap",85};86 87static const char * const iio_modifier_names[] = {88 [IIO_MOD_X] = "x",89 [IIO_MOD_Y] = "y",90 [IIO_MOD_Z] = "z",91 [IIO_MOD_X_AND_Y] = "x&y",92 [IIO_MOD_X_AND_Z] = "x&z",93 [IIO_MOD_Y_AND_Z] = "y&z",94 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",95 [IIO_MOD_X_OR_Y] = "x|y",96 [IIO_MOD_X_OR_Z] = "x|z",97 [IIO_MOD_Y_OR_Z] = "y|z",98 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",99 [IIO_MOD_LIGHT_BOTH] = "both",100 [IIO_MOD_LIGHT_IR] = "ir",101 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",102 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",103 [IIO_MOD_LIGHT_CLEAR] = "clear",104 [IIO_MOD_LIGHT_RED] = "red",105 [IIO_MOD_LIGHT_GREEN] = "green",106 [IIO_MOD_LIGHT_BLUE] = "blue",107 [IIO_MOD_LIGHT_UV] = "uv",108 [IIO_MOD_LIGHT_UVA] = "uva",109 [IIO_MOD_LIGHT_UVB] = "uvb",110 [IIO_MOD_LIGHT_DUV] = "duv",111 [IIO_MOD_QUATERNION] = "quaternion",112 [IIO_MOD_TEMP_AMBIENT] = "ambient",113 [IIO_MOD_TEMP_OBJECT] = "object",114 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",115 [IIO_MOD_NORTH_TRUE] = "from_north_true",116 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",117 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",118 [IIO_MOD_RUNNING] = "running",119 [IIO_MOD_JOGGING] = "jogging",120 [IIO_MOD_WALKING] = "walking",121 [IIO_MOD_STILL] = "still",122 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",123 [IIO_MOD_I] = "i",124 [IIO_MOD_Q] = "q",125 [IIO_MOD_CO2] = "co2",126 [IIO_MOD_ETHANOL] = "ethanol",127 [IIO_MOD_H2] = "h2",128 [IIO_MOD_VOC] = "voc",129 [IIO_MOD_PM1] = "pm1",130 [IIO_MOD_PM2P5] = "pm2p5",131 [IIO_MOD_PM4] = "pm4",132 [IIO_MOD_PM10] = "pm10",133 [IIO_MOD_O2] = "o2",134 [IIO_MOD_LINEAR_X] = "linear_x",135 [IIO_MOD_LINEAR_Y] = "linear_y",136 [IIO_MOD_LINEAR_Z] = "linear_z",137 [IIO_MOD_PITCH] = "pitch",138 [IIO_MOD_YAW] = "yaw",139 [IIO_MOD_ROLL] = "roll",140};141 142static bool event_is_known(struct iio_event_data *event)143{144 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);145 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);146 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);147 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);148 149 switch (type) {150 case IIO_VOLTAGE:151 case IIO_CURRENT:152 case IIO_POWER:153 case IIO_ACCEL:154 case IIO_ANGL_VEL:155 case IIO_MAGN:156 case IIO_LIGHT:157 case IIO_INTENSITY:158 case IIO_PROXIMITY:159 case IIO_TEMP:160 case IIO_INCLI:161 case IIO_ROT:162 case IIO_ANGL:163 case IIO_TIMESTAMP:164 case IIO_CAPACITANCE:165 case IIO_ALTVOLTAGE:166 case IIO_CCT:167 case IIO_PRESSURE:168 case IIO_HUMIDITYRELATIVE:169 case IIO_ACTIVITY:170 case IIO_STEPS:171 case IIO_ENERGY:172 case IIO_DISTANCE:173 case IIO_VELOCITY:174 case IIO_CONCENTRATION:175 case IIO_RESISTANCE:176 case IIO_PH:177 case IIO_UVINDEX:178 case IIO_GRAVITY:179 case IIO_POSITIONRELATIVE:180 case IIO_PHASE:181 case IIO_MASSCONCENTRATION:182 case IIO_DELTA_ANGL:183 case IIO_DELTA_VELOCITY:184 case IIO_COLORTEMP:185 case IIO_CHROMATICITY:186 break;187 default:188 return false;189 }190 191 switch (mod) {192 case IIO_NO_MOD:193 case IIO_MOD_X:194 case IIO_MOD_Y:195 case IIO_MOD_Z:196 case IIO_MOD_X_AND_Y:197 case IIO_MOD_X_AND_Z:198 case IIO_MOD_Y_AND_Z:199 case IIO_MOD_X_AND_Y_AND_Z:200 case IIO_MOD_X_OR_Y:201 case IIO_MOD_X_OR_Z:202 case IIO_MOD_Y_OR_Z:203 case IIO_MOD_X_OR_Y_OR_Z:204 case IIO_MOD_LIGHT_BOTH:205 case IIO_MOD_LIGHT_IR:206 case IIO_MOD_ROOT_SUM_SQUARED_X_Y:207 case IIO_MOD_SUM_SQUARED_X_Y_Z:208 case IIO_MOD_LIGHT_CLEAR:209 case IIO_MOD_LIGHT_RED:210 case IIO_MOD_LIGHT_GREEN:211 case IIO_MOD_LIGHT_BLUE:212 case IIO_MOD_LIGHT_UV:213 case IIO_MOD_LIGHT_DUV:214 case IIO_MOD_QUATERNION:215 case IIO_MOD_TEMP_AMBIENT:216 case IIO_MOD_TEMP_OBJECT:217 case IIO_MOD_NORTH_MAGN:218 case IIO_MOD_NORTH_TRUE:219 case IIO_MOD_NORTH_MAGN_TILT_COMP:220 case IIO_MOD_NORTH_TRUE_TILT_COMP:221 case IIO_MOD_RUNNING:222 case IIO_MOD_JOGGING:223 case IIO_MOD_WALKING:224 case IIO_MOD_STILL:225 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:226 case IIO_MOD_I:227 case IIO_MOD_Q:228 case IIO_MOD_CO2:229 case IIO_MOD_ETHANOL:230 case IIO_MOD_H2:231 case IIO_MOD_VOC:232 case IIO_MOD_PM1:233 case IIO_MOD_PM2P5:234 case IIO_MOD_PM4:235 case IIO_MOD_PM10:236 case IIO_MOD_O2:237 break;238 default:239 return false;240 }241 242 switch (ev_type) {243 case IIO_EV_TYPE_THRESH:244 case IIO_EV_TYPE_MAG:245 case IIO_EV_TYPE_ROC:246 case IIO_EV_TYPE_THRESH_ADAPTIVE:247 case IIO_EV_TYPE_MAG_ADAPTIVE:248 case IIO_EV_TYPE_CHANGE:249 case IIO_EV_TYPE_GESTURE:250 break;251 default:252 return false;253 }254 255 switch (dir) {256 case IIO_EV_DIR_EITHER:257 case IIO_EV_DIR_RISING:258 case IIO_EV_DIR_FALLING:259 case IIO_EV_DIR_SINGLETAP:260 case IIO_EV_DIR_DOUBLETAP:261 case IIO_EV_DIR_NONE:262 break;263 default:264 return false;265 }266 267 return true;268}269 270static void print_event(struct iio_event_data *event)271{272 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);273 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);274 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);275 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);276 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);277 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);278 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);279 280 if (!event_is_known(event)) {281 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",282 event->timestamp, event->id);283 284 return;285 }286 287 printf("Event: time: %lld, type: %s", event->timestamp,288 iio_chan_type_name_spec[type]);289 290 if (mod != IIO_NO_MOD)291 printf("(%s)", iio_modifier_names[mod]);292 293 if (chan >= 0) {294 printf(", channel: %d", chan);295 if (diff && chan2 >= 0)296 printf("-%d", chan2);297 }298 299 printf(", evtype: %s", iio_ev_type_text[ev_type]);300 301 if (dir != IIO_EV_DIR_NONE)302 printf(", direction: %s", iio_ev_dir_text[dir]);303 304 printf("\n");305 fflush(stdout);306}307 308/* Enable or disable events in sysfs if the knob is available */309static void enable_events(char *dev_dir, int enable)310{311 const struct dirent *ent;312 char evdir[256];313 int ret;314 DIR *dp;315 316 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);317 evdir[sizeof(evdir)-1] = '\0';318 319 dp = opendir(evdir);320 if (!dp) {321 fprintf(stderr, "Enabling/disabling events: can't open %s\n",322 evdir);323 return;324 }325 326 while (ent = readdir(dp), ent) {327 if (iioutils_check_suffix(ent->d_name, "_en")) {328 printf("%sabling: %s\n",329 enable ? "En" : "Dis",330 ent->d_name);331 ret = write_sysfs_int(ent->d_name, evdir,332 enable);333 if (ret < 0)334 fprintf(stderr, "Failed to enable/disable %s\n",335 ent->d_name);336 }337 }338 339 if (closedir(dp) == -1) {340 perror("Enabling/disabling channels: "341 "Failed to close directory");342 return;343 }344}345 346int main(int argc, char **argv)347{348 struct iio_event_data event;349 const char *device_name;350 char *dev_dir_name = NULL;351 char *chrdev_name;352 int ret;353 int dev_num;354 int fd, event_fd;355 bool all_events = false;356 357 if (argc == 2) {358 device_name = argv[1];359 } else if (argc == 3) {360 device_name = argv[2];361 if (!strcmp(argv[1], "-a"))362 all_events = true;363 } else {364 fprintf(stderr,365 "Usage: iio_event_monitor [options] <device_name>\n"366 "Listen and display events from IIO devices\n"367 " -a Auto-activate all available events\n");368 return -1;369 }370 371 dev_num = find_type_by_name(device_name, "iio:device");372 if (dev_num >= 0) {373 printf("Found IIO device with name %s with device number %d\n",374 device_name, dev_num);375 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);376 if (ret < 0)377 return -ENOMEM;378 /* Look up sysfs dir as well if we can */379 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);380 if (ret < 0)381 return -ENOMEM;382 } else {383 /*384 * If we can't find an IIO device by name assume device_name is385 * an IIO chrdev386 */387 chrdev_name = strdup(device_name);388 if (!chrdev_name)389 return -ENOMEM;390 }391 392 if (all_events && dev_dir_name)393 enable_events(dev_dir_name, 1);394 395 fd = open(chrdev_name, 0);396 if (fd == -1) {397 ret = -errno;398 fprintf(stderr, "Failed to open %s\n", chrdev_name);399 goto error_free_chrdev_name;400 }401 402 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);403 if (ret == -1 || event_fd == -1) {404 ret = -errno;405 if (ret == -ENODEV)406 fprintf(stderr,407 "This device does not support events\n");408 else409 fprintf(stderr, "Failed to retrieve event fd\n");410 if (close(fd) == -1)411 perror("Failed to close character device file");412 413 goto error_free_chrdev_name;414 }415 416 if (close(fd) == -1) {417 ret = -errno;418 goto error_free_chrdev_name;419 }420 421 while (true) {422 ret = read(event_fd, &event, sizeof(event));423 if (ret == -1) {424 if (errno == EAGAIN) {425 fprintf(stderr, "nothing available\n");426 continue;427 } else {428 ret = -errno;429 perror("Failed to read event from device");430 break;431 }432 }433 434 if (ret != sizeof(event)) {435 fprintf(stderr, "Reading event failed!\n");436 ret = -EIO;437 break;438 }439 440 print_event(&event);441 }442 443 if (close(event_fd) == -1)444 perror("Failed to close event file");445 446error_free_chrdev_name:447 /* Disable events after use */448 if (all_events && dev_dir_name)449 enable_events(dev_dir_name, 0);450 451 free(chrdev_name);452 453 return ret;454}455