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 <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 29 static 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 }; 63 64 static const char * const iio_ev_type_text[] = { 65 [IIO_EV_TYPE_THRESH] = "thresh", 66 [IIO_EV_TYPE_MAG] = "mag", 67 [IIO_EV_TYPE_ROC] = "roc", 68 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 69 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 70 [IIO_EV_TYPE_CHANGE] = "change", 71 [IIO_EV_TYPE_MAG_REFERENCED] = "mag_referenced", 72 }; 73 74 static const char * const iio_ev_dir_text[] = { 75 [IIO_EV_DIR_EITHER] = "either", 76 [IIO_EV_DIR_RISING] = "rising", 77 [IIO_EV_DIR_FALLING] = "falling" 78 }; 79 80 static const char * const iio_modifier_names[] = { 81 [IIO_MOD_X] = "x", 82 [IIO_MOD_Y] = "y", 83 [IIO_MOD_Z] = "z", 84 [IIO_MOD_X_AND_Y] = "x&y", 85 [IIO_MOD_X_AND_Z] = "x&z", 86 [IIO_MOD_Y_AND_Z] = "y&z", 87 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 88 [IIO_MOD_X_OR_Y] = "x|y", 89 [IIO_MOD_X_OR_Z] = "x|z", 90 [IIO_MOD_Y_OR_Z] = "y|z", 91 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 92 [IIO_MOD_LIGHT_BOTH] = "both", 93 [IIO_MOD_LIGHT_IR] = "ir", 94 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 95 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 96 [IIO_MOD_LIGHT_CLEAR] = "clear", 97 [IIO_MOD_LIGHT_RED] = "red", 98 [IIO_MOD_LIGHT_GREEN] = "green", 99 [IIO_MOD_LIGHT_BLUE] = "blue", 100 [IIO_MOD_LIGHT_UV] = "uv", 101 [IIO_MOD_LIGHT_DUV] = "duv", 102 [IIO_MOD_QUATERNION] = "quaternion", 103 [IIO_MOD_TEMP_AMBIENT] = "ambient", 104 [IIO_MOD_TEMP_OBJECT] = "object", 105 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 106 [IIO_MOD_NORTH_TRUE] = "from_north_true", 107 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 108 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 109 [IIO_MOD_RUNNING] = "running", 110 [IIO_MOD_JOGGING] = "jogging", 111 [IIO_MOD_WALKING] = "walking", 112 [IIO_MOD_STILL] = "still", 113 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 114 [IIO_MOD_I] = "i", 115 [IIO_MOD_Q] = "q", 116 [IIO_MOD_CO2] = "co2", 117 [IIO_MOD_ETHANOL] = "ethanol", 118 [IIO_MOD_H2] = "h2", 119 [IIO_MOD_VOC] = "voc", 120 [IIO_MOD_PM1] = "pm1", 121 [IIO_MOD_PM2P5] = "pm2p5", 122 [IIO_MOD_PM4] = "pm4", 123 [IIO_MOD_PM10] = "pm10", 124 [IIO_MOD_O2] = "o2", 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 case IIO_MOD_O2: 218 break; 219 default: 220 return false; 221 } 222 223 switch (ev_type) { 224 case IIO_EV_TYPE_THRESH: 225 case IIO_EV_TYPE_MAG: 226 case IIO_EV_TYPE_ROC: 227 case IIO_EV_TYPE_THRESH_ADAPTIVE: 228 case IIO_EV_TYPE_MAG_ADAPTIVE: 229 case IIO_EV_TYPE_CHANGE: 230 break; 231 default: 232 return false; 233 } 234 235 switch (dir) { 236 case IIO_EV_DIR_EITHER: 237 case IIO_EV_DIR_RISING: 238 case IIO_EV_DIR_FALLING: 239 case IIO_EV_DIR_NONE: 240 break; 241 default: 242 return false; 243 } 244 245 return true; 246 } 247 248 static void print_event(struct iio_event_data *event) 249 { 250 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 251 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 252 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 253 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 254 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id); 255 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id); 256 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id); 257 258 if (!event_is_known(event)) { 259 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n", 260 event->timestamp, event->id); 261 262 return; 263 } 264 265 printf("Event: time: %lld, type: %s", event->timestamp, 266 iio_chan_type_name_spec[type]); 267 268 if (mod != IIO_NO_MOD) 269 printf("(%s)", iio_modifier_names[mod]); 270 271 if (chan >= 0) { 272 printf(", channel: %d", chan); 273 if (diff && chan2 >= 0) 274 printf("-%d", chan2); 275 } 276 277 printf(", evtype: %s", iio_ev_type_text[ev_type]); 278 279 if (dir != IIO_EV_DIR_NONE) 280 printf(", direction: %s", iio_ev_dir_text[dir]); 281 282 printf("\n"); 283 fflush(stdout); 284 } 285 286 /* Enable or disable events in sysfs if the knob is available */ 287 static void enable_events(char *dev_dir, int enable) 288 { 289 const struct dirent *ent; 290 char evdir[256]; 291 int ret; 292 DIR *dp; 293 294 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir); 295 evdir[sizeof(evdir)-1] = '\0'; 296 297 dp = opendir(evdir); 298 if (!dp) { 299 fprintf(stderr, "Enabling/disabling events: can't open %s\n", 300 evdir); 301 return; 302 } 303 304 while (ent = readdir(dp), ent) { 305 if (iioutils_check_suffix(ent->d_name, "_en")) { 306 printf("%sabling: %s\n", 307 enable ? "En" : "Dis", 308 ent->d_name); 309 ret = write_sysfs_int(ent->d_name, evdir, 310 enable); 311 if (ret < 0) 312 fprintf(stderr, "Failed to enable/disable %s\n", 313 ent->d_name); 314 } 315 } 316 317 if (closedir(dp) == -1) { 318 perror("Enabling/disabling channels: " 319 "Failed to close directory"); 320 return; 321 } 322 } 323 324 int main(int argc, char **argv) 325 { 326 struct iio_event_data event; 327 const char *device_name; 328 char *dev_dir_name = NULL; 329 char *chrdev_name; 330 int ret; 331 int dev_num; 332 int fd, event_fd; 333 bool all_events = false; 334 335 if (argc == 2) { 336 device_name = argv[1]; 337 } else if (argc == 3) { 338 device_name = argv[2]; 339 if (!strcmp(argv[1], "-a")) 340 all_events = true; 341 } else { 342 fprintf(stderr, 343 "Usage: iio_event_monitor [options] <device_name>\n" 344 "Listen and display events from IIO devices\n" 345 " -a Auto-activate all available events\n"); 346 return -1; 347 } 348 349 dev_num = find_type_by_name(device_name, "iio:device"); 350 if (dev_num >= 0) { 351 printf("Found IIO device with name %s with device number %d\n", 352 device_name, dev_num); 353 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num); 354 if (ret < 0) 355 return -ENOMEM; 356 /* Look up sysfs dir as well if we can */ 357 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); 358 if (ret < 0) 359 return -ENOMEM; 360 } else { 361 /* 362 * If we can't find an IIO device by name assume device_name is 363 * an IIO chrdev 364 */ 365 chrdev_name = strdup(device_name); 366 if (!chrdev_name) 367 return -ENOMEM; 368 } 369 370 if (all_events && dev_dir_name) 371 enable_events(dev_dir_name, 1); 372 373 fd = open(chrdev_name, 0); 374 if (fd == -1) { 375 ret = -errno; 376 fprintf(stderr, "Failed to open %s\n", chrdev_name); 377 goto error_free_chrdev_name; 378 } 379 380 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd); 381 if (ret == -1 || event_fd == -1) { 382 ret = -errno; 383 if (ret == -ENODEV) 384 fprintf(stderr, 385 "This device does not support events\n"); 386 else 387 fprintf(stderr, "Failed to retrieve event fd\n"); 388 if (close(fd) == -1) 389 perror("Failed to close character device file"); 390 391 goto error_free_chrdev_name; 392 } 393 394 if (close(fd) == -1) { 395 ret = -errno; 396 goto error_free_chrdev_name; 397 } 398 399 while (true) { 400 ret = read(event_fd, &event, sizeof(event)); 401 if (ret == -1) { 402 if (errno == EAGAIN) { 403 fprintf(stderr, "nothing available\n"); 404 continue; 405 } else { 406 ret = -errno; 407 perror("Failed to read event from device"); 408 break; 409 } 410 } 411 412 if (ret != sizeof(event)) { 413 fprintf(stderr, "Reading event failed!\n"); 414 ret = -EIO; 415 break; 416 } 417 418 print_event(&event); 419 } 420 421 if (close(event_fd) == -1) 422 perror("Failed to close event file"); 423 424 error_free_chrdev_name: 425 /* Disable events after use */ 426 if (all_events && dev_dir_name) 427 enable_events(dev_dir_name, 0); 428 429 free(chrdev_name); 430 431 return ret; 432 } 433