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