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 }; 67 68 static 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 79 static 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 87 static 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 }; 141 142 static 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 } 269 270 static 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 */ 309 static 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 } 345 346 int 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 is 385 * an IIO chrdev 386 */ 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 else 409 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"); 445 446 error_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