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