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 [IIO_DELTA_ANGL] = "deltaangl", 63 [IIO_DELTA_VELOCITY] = "deltavelocity", 64 [IIO_COLORTEMP] = "colortemp", 65 [IIO_CHROMATICITY] = "chromaticity", 66 [IIO_ATTENTION] = "attention", 67 }; 68 69 static const char * const iio_ev_type_text[] = { 70 [IIO_EV_TYPE_THRESH] = "thresh", 71 [IIO_EV_TYPE_MAG] = "mag", 72 [IIO_EV_TYPE_ROC] = "roc", 73 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 74 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 75 [IIO_EV_TYPE_CHANGE] = "change", 76 [IIO_EV_TYPE_MAG_REFERENCED] = "mag_referenced", 77 [IIO_EV_TYPE_GESTURE] = "gesture", 78 [IIO_EV_TYPE_FAULT] = "fault", 79 }; 80 81 static const char * const iio_ev_dir_text[] = { 82 [IIO_EV_DIR_EITHER] = "either", 83 [IIO_EV_DIR_RISING] = "rising", 84 [IIO_EV_DIR_FALLING] = "falling", 85 [IIO_EV_DIR_SINGLETAP] = "singletap", 86 [IIO_EV_DIR_DOUBLETAP] = "doubletap", 87 [IIO_EV_DIR_FAULT_OPENWIRE] = "openwire", 88 }; 89 90 static const char * const iio_modifier_names[] = { 91 [IIO_MOD_X] = "x", 92 [IIO_MOD_Y] = "y", 93 [IIO_MOD_Z] = "z", 94 [IIO_MOD_X_AND_Y] = "x&y", 95 [IIO_MOD_X_AND_Z] = "x&z", 96 [IIO_MOD_Y_AND_Z] = "y&z", 97 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 98 [IIO_MOD_X_OR_Y] = "x|y", 99 [IIO_MOD_X_OR_Z] = "x|z", 100 [IIO_MOD_Y_OR_Z] = "y|z", 101 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 102 [IIO_MOD_LIGHT_BOTH] = "both", 103 [IIO_MOD_LIGHT_IR] = "ir", 104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 105 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 106 [IIO_MOD_LIGHT_CLEAR] = "clear", 107 [IIO_MOD_LIGHT_RED] = "red", 108 [IIO_MOD_LIGHT_GREEN] = "green", 109 [IIO_MOD_LIGHT_BLUE] = "blue", 110 [IIO_MOD_LIGHT_UV] = "uv", 111 [IIO_MOD_LIGHT_UVA] = "uva", 112 [IIO_MOD_LIGHT_UVB] = "uvb", 113 [IIO_MOD_LIGHT_DUV] = "duv", 114 [IIO_MOD_QUATERNION] = "quaternion", 115 [IIO_MOD_TEMP_AMBIENT] = "ambient", 116 [IIO_MOD_TEMP_OBJECT] = "object", 117 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 118 [IIO_MOD_NORTH_TRUE] = "from_north_true", 119 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 120 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 121 [IIO_MOD_RUNNING] = "running", 122 [IIO_MOD_JOGGING] = "jogging", 123 [IIO_MOD_WALKING] = "walking", 124 [IIO_MOD_STILL] = "still", 125 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 126 [IIO_MOD_I] = "i", 127 [IIO_MOD_Q] = "q", 128 [IIO_MOD_CO2] = "co2", 129 [IIO_MOD_ETHANOL] = "ethanol", 130 [IIO_MOD_H2] = "h2", 131 [IIO_MOD_VOC] = "voc", 132 [IIO_MOD_PM1] = "pm1", 133 [IIO_MOD_PM2P5] = "pm2p5", 134 [IIO_MOD_PM4] = "pm4", 135 [IIO_MOD_PM10] = "pm10", 136 [IIO_MOD_O2] = "o2", 137 [IIO_MOD_LINEAR_X] = "linear_x", 138 [IIO_MOD_LINEAR_Y] = "linear_y", 139 [IIO_MOD_LINEAR_Z] = "linear_z", 140 [IIO_MOD_PITCH] = "pitch", 141 [IIO_MOD_YAW] = "yaw", 142 [IIO_MOD_ROLL] = "roll", 143 }; 144 145 static bool event_is_known(struct iio_event_data *event) 146 { 147 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 148 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 149 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 150 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 151 152 switch (type) { 153 case IIO_VOLTAGE: 154 case IIO_CURRENT: 155 case IIO_POWER: 156 case IIO_ACCEL: 157 case IIO_ANGL_VEL: 158 case IIO_MAGN: 159 case IIO_LIGHT: 160 case IIO_INTENSITY: 161 case IIO_PROXIMITY: 162 case IIO_TEMP: 163 case IIO_INCLI: 164 case IIO_ROT: 165 case IIO_ANGL: 166 case IIO_TIMESTAMP: 167 case IIO_CAPACITANCE: 168 case IIO_ALTVOLTAGE: 169 case IIO_CCT: 170 case IIO_PRESSURE: 171 case IIO_HUMIDITYRELATIVE: 172 case IIO_ACTIVITY: 173 case IIO_STEPS: 174 case IIO_ENERGY: 175 case IIO_DISTANCE: 176 case IIO_VELOCITY: 177 case IIO_CONCENTRATION: 178 case IIO_RESISTANCE: 179 case IIO_PH: 180 case IIO_UVINDEX: 181 case IIO_GRAVITY: 182 case IIO_POSITIONRELATIVE: 183 case IIO_PHASE: 184 case IIO_MASSCONCENTRATION: 185 case IIO_DELTA_ANGL: 186 case IIO_DELTA_VELOCITY: 187 case IIO_COLORTEMP: 188 case IIO_CHROMATICITY: 189 case IIO_ATTENTION: 190 break; 191 default: 192 return false; 193 } 194 195 switch (mod) { 196 case IIO_NO_MOD: 197 case IIO_MOD_X: 198 case IIO_MOD_Y: 199 case IIO_MOD_Z: 200 case IIO_MOD_X_AND_Y: 201 case IIO_MOD_X_AND_Z: 202 case IIO_MOD_Y_AND_Z: 203 case IIO_MOD_X_AND_Y_AND_Z: 204 case IIO_MOD_X_OR_Y: 205 case IIO_MOD_X_OR_Z: 206 case IIO_MOD_Y_OR_Z: 207 case IIO_MOD_X_OR_Y_OR_Z: 208 case IIO_MOD_LIGHT_BOTH: 209 case IIO_MOD_LIGHT_IR: 210 case IIO_MOD_ROOT_SUM_SQUARED_X_Y: 211 case IIO_MOD_SUM_SQUARED_X_Y_Z: 212 case IIO_MOD_LIGHT_CLEAR: 213 case IIO_MOD_LIGHT_RED: 214 case IIO_MOD_LIGHT_GREEN: 215 case IIO_MOD_LIGHT_BLUE: 216 case IIO_MOD_LIGHT_UV: 217 case IIO_MOD_LIGHT_DUV: 218 case IIO_MOD_QUATERNION: 219 case IIO_MOD_TEMP_AMBIENT: 220 case IIO_MOD_TEMP_OBJECT: 221 case IIO_MOD_NORTH_MAGN: 222 case IIO_MOD_NORTH_TRUE: 223 case IIO_MOD_NORTH_MAGN_TILT_COMP: 224 case IIO_MOD_NORTH_TRUE_TILT_COMP: 225 case IIO_MOD_RUNNING: 226 case IIO_MOD_JOGGING: 227 case IIO_MOD_WALKING: 228 case IIO_MOD_STILL: 229 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z: 230 case IIO_MOD_I: 231 case IIO_MOD_Q: 232 case IIO_MOD_CO2: 233 case IIO_MOD_ETHANOL: 234 case IIO_MOD_H2: 235 case IIO_MOD_VOC: 236 case IIO_MOD_PM1: 237 case IIO_MOD_PM2P5: 238 case IIO_MOD_PM4: 239 case IIO_MOD_PM10: 240 case IIO_MOD_O2: 241 break; 242 default: 243 return false; 244 } 245 246 switch (ev_type) { 247 case IIO_EV_TYPE_THRESH: 248 case IIO_EV_TYPE_MAG: 249 case IIO_EV_TYPE_ROC: 250 case IIO_EV_TYPE_THRESH_ADAPTIVE: 251 case IIO_EV_TYPE_MAG_ADAPTIVE: 252 case IIO_EV_TYPE_CHANGE: 253 case IIO_EV_TYPE_GESTURE: 254 case IIO_EV_TYPE_FAULT: 255 break; 256 default: 257 return false; 258 } 259 260 switch (dir) { 261 case IIO_EV_DIR_EITHER: 262 case IIO_EV_DIR_RISING: 263 case IIO_EV_DIR_FALLING: 264 case IIO_EV_DIR_SINGLETAP: 265 case IIO_EV_DIR_DOUBLETAP: 266 case IIO_EV_DIR_FAULT_OPENWIRE: 267 case IIO_EV_DIR_NONE: 268 break; 269 default: 270 return false; 271 } 272 273 return true; 274 } 275 276 static void print_event(struct iio_event_data *event) 277 { 278 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 279 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 280 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 281 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 282 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id); 283 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id); 284 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id); 285 286 if (!event_is_known(event)) { 287 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n", 288 event->timestamp, event->id); 289 290 return; 291 } 292 293 printf("Event: time: %lld, type: %s", event->timestamp, 294 iio_chan_type_name_spec[type]); 295 296 if (mod != IIO_NO_MOD) 297 printf("(%s)", iio_modifier_names[mod]); 298 299 if (chan >= 0) { 300 printf(", channel: %d", chan); 301 if (diff && chan2 >= 0) 302 printf("-%d", chan2); 303 } 304 305 printf(", evtype: %s", iio_ev_type_text[ev_type]); 306 307 if (dir != IIO_EV_DIR_NONE) 308 printf(", direction: %s", iio_ev_dir_text[dir]); 309 310 printf("\n"); 311 fflush(stdout); 312 } 313 314 /* Enable or disable events in sysfs if the knob is available */ 315 static void enable_events(char *dev_dir, int enable) 316 { 317 const struct dirent *ent; 318 char evdir[256]; 319 int ret; 320 DIR *dp; 321 322 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir); 323 evdir[sizeof(evdir)-1] = '\0'; 324 325 dp = opendir(evdir); 326 if (!dp) { 327 fprintf(stderr, "Enabling/disabling events: can't open %s\n", 328 evdir); 329 return; 330 } 331 332 while (ent = readdir(dp), ent) { 333 if (iioutils_check_suffix(ent->d_name, "_en")) { 334 printf("%sabling: %s\n", 335 enable ? "En" : "Dis", 336 ent->d_name); 337 ret = write_sysfs_int(ent->d_name, evdir, 338 enable); 339 if (ret < 0) 340 fprintf(stderr, "Failed to enable/disable %s\n", 341 ent->d_name); 342 } 343 } 344 345 if (closedir(dp) == -1) { 346 perror("Enabling/disabling channels: " 347 "Failed to close directory"); 348 return; 349 } 350 } 351 352 int main(int argc, char **argv) 353 { 354 struct iio_event_data event; 355 const char *device_name; 356 char *dev_dir_name = NULL; 357 char *chrdev_name; 358 int ret; 359 int dev_num; 360 int fd, event_fd; 361 bool all_events = false; 362 363 if (argc == 2) { 364 device_name = argv[1]; 365 } else if (argc == 3) { 366 device_name = argv[2]; 367 if (!strcmp(argv[1], "-a")) 368 all_events = true; 369 } else { 370 fprintf(stderr, 371 "Usage: iio_event_monitor [options] <device_name>\n" 372 "Listen and display events from IIO devices\n" 373 " -a Auto-activate all available events\n"); 374 return -1; 375 } 376 377 dev_num = find_type_by_name(device_name, "iio:device"); 378 if (dev_num >= 0) { 379 printf("Found IIO device with name %s with device number %d\n", 380 device_name, dev_num); 381 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num); 382 if (ret < 0) 383 return -ENOMEM; 384 /* Look up sysfs dir as well if we can */ 385 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); 386 if (ret < 0) 387 return -ENOMEM; 388 } else { 389 /* 390 * If we can't find an IIO device by name assume device_name is 391 * an IIO chrdev 392 */ 393 chrdev_name = strdup(device_name); 394 if (!chrdev_name) 395 return -ENOMEM; 396 } 397 398 if (all_events && dev_dir_name) 399 enable_events(dev_dir_name, 1); 400 401 fd = open(chrdev_name, 0); 402 if (fd == -1) { 403 ret = -errno; 404 fprintf(stderr, "Failed to open %s\n", chrdev_name); 405 goto error_free_chrdev_name; 406 } 407 408 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd); 409 if (ret == -1 || event_fd == -1) { 410 ret = -errno; 411 if (ret == -ENODEV) 412 fprintf(stderr, 413 "This device does not support events\n"); 414 else 415 fprintf(stderr, "Failed to retrieve event fd\n"); 416 if (close(fd) == -1) 417 perror("Failed to close character device file"); 418 419 goto error_free_chrdev_name; 420 } 421 422 if (close(fd) == -1) { 423 ret = -errno; 424 goto error_free_chrdev_name; 425 } 426 427 while (true) { 428 ret = read(event_fd, &event, sizeof(event)); 429 if (ret == -1) { 430 if (errno == EAGAIN) { 431 fprintf(stderr, "nothing available\n"); 432 continue; 433 } else { 434 ret = -errno; 435 perror("Failed to read event from device"); 436 break; 437 } 438 } 439 440 if (ret != sizeof(event)) { 441 fprintf(stderr, "Reading event failed!\n"); 442 ret = -EIO; 443 break; 444 } 445 446 print_event(&event); 447 } 448 449 if (close(event_fd) == -1) 450 perror("Failed to close event file"); 451 452 error_free_chrdev_name: 453 /* Disable events after use */ 454 if (all_events && dev_dir_name) 455 enable_events(dev_dir_name, 0); 456 457 free(chrdev_name); 458 free(dev_dir_name); 459 460 return ret; 461 } 462