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