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