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 <stdbool.h> 18 #include <stdio.h> 19 #include <errno.h> 20 #include <string.h> 21 #include <poll.h> 22 #include <fcntl.h> 23 #include <sys/ioctl.h> 24 #include "iio_utils.h" 25 #include <linux/iio/events.h> 26 #include <linux/iio/types.h> 27 28 static const char * const iio_chan_type_name_spec[] = { 29 [IIO_VOLTAGE] = "voltage", 30 [IIO_CURRENT] = "current", 31 [IIO_POWER] = "power", 32 [IIO_ACCEL] = "accel", 33 [IIO_ANGL_VEL] = "anglvel", 34 [IIO_MAGN] = "magn", 35 [IIO_LIGHT] = "illuminance", 36 [IIO_INTENSITY] = "intensity", 37 [IIO_PROXIMITY] = "proximity", 38 [IIO_TEMP] = "temp", 39 [IIO_INCLI] = "incli", 40 [IIO_ROT] = "rot", 41 [IIO_ANGL] = "angl", 42 [IIO_TIMESTAMP] = "timestamp", 43 [IIO_CAPACITANCE] = "capacitance", 44 [IIO_ALTVOLTAGE] = "altvoltage", 45 [IIO_CCT] = "cct", 46 [IIO_PRESSURE] = "pressure", 47 [IIO_HUMIDITYRELATIVE] = "humidityrelative", 48 [IIO_ACTIVITY] = "activity", 49 [IIO_STEPS] = "steps", 50 [IIO_ENERGY] = "energy", 51 [IIO_DISTANCE] = "distance", 52 [IIO_VELOCITY] = "velocity", 53 [IIO_CONCENTRATION] = "concentration", 54 [IIO_RESISTANCE] = "resistance", 55 [IIO_PH] = "ph", 56 [IIO_UVINDEX] = "uvindex", 57 [IIO_GRAVITY] = "gravity", 58 [IIO_POSITIONRELATIVE] = "positionrelative", 59 [IIO_PHASE] = "phase", 60 [IIO_MASSCONCENTRATION] = "massconcentration", 61 }; 62 63 static const char * const iio_ev_type_text[] = { 64 [IIO_EV_TYPE_THRESH] = "thresh", 65 [IIO_EV_TYPE_MAG] = "mag", 66 [IIO_EV_TYPE_ROC] = "roc", 67 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 68 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 69 [IIO_EV_TYPE_CHANGE] = "change", 70 }; 71 72 static const char * const iio_ev_dir_text[] = { 73 [IIO_EV_DIR_EITHER] = "either", 74 [IIO_EV_DIR_RISING] = "rising", 75 [IIO_EV_DIR_FALLING] = "falling" 76 }; 77 78 static const char * const iio_modifier_names[] = { 79 [IIO_MOD_X] = "x", 80 [IIO_MOD_Y] = "y", 81 [IIO_MOD_Z] = "z", 82 [IIO_MOD_X_AND_Y] = "x&y", 83 [IIO_MOD_X_AND_Z] = "x&z", 84 [IIO_MOD_Y_AND_Z] = "y&z", 85 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 86 [IIO_MOD_X_OR_Y] = "x|y", 87 [IIO_MOD_X_OR_Z] = "x|z", 88 [IIO_MOD_Y_OR_Z] = "y|z", 89 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 90 [IIO_MOD_LIGHT_BOTH] = "both", 91 [IIO_MOD_LIGHT_IR] = "ir", 92 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 93 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 94 [IIO_MOD_LIGHT_CLEAR] = "clear", 95 [IIO_MOD_LIGHT_RED] = "red", 96 [IIO_MOD_LIGHT_GREEN] = "green", 97 [IIO_MOD_LIGHT_BLUE] = "blue", 98 [IIO_MOD_LIGHT_UV] = "uv", 99 [IIO_MOD_LIGHT_DUV] = "duv", 100 [IIO_MOD_QUATERNION] = "quaternion", 101 [IIO_MOD_TEMP_AMBIENT] = "ambient", 102 [IIO_MOD_TEMP_OBJECT] = "object", 103 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 104 [IIO_MOD_NORTH_TRUE] = "from_north_true", 105 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 106 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 107 [IIO_MOD_RUNNING] = "running", 108 [IIO_MOD_JOGGING] = "jogging", 109 [IIO_MOD_WALKING] = "walking", 110 [IIO_MOD_STILL] = "still", 111 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 112 [IIO_MOD_I] = "i", 113 [IIO_MOD_Q] = "q", 114 [IIO_MOD_CO2] = "co2", 115 [IIO_MOD_ETHANOL] = "ethanol", 116 [IIO_MOD_H2] = "h2", 117 [IIO_MOD_VOC] = "voc", 118 [IIO_MOD_PM1] = "pm1", 119 [IIO_MOD_PM2P5] = "pm2p5", 120 [IIO_MOD_PM4] = "pm4", 121 [IIO_MOD_PM10] = "pm10", 122 [IIO_MOD_O2] = "o2", 123 }; 124 125 static bool event_is_known(struct iio_event_data *event) 126 { 127 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 128 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 129 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 130 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 131 132 switch (type) { 133 case IIO_VOLTAGE: 134 case IIO_CURRENT: 135 case IIO_POWER: 136 case IIO_ACCEL: 137 case IIO_ANGL_VEL: 138 case IIO_MAGN: 139 case IIO_LIGHT: 140 case IIO_INTENSITY: 141 case IIO_PROXIMITY: 142 case IIO_TEMP: 143 case IIO_INCLI: 144 case IIO_ROT: 145 case IIO_ANGL: 146 case IIO_TIMESTAMP: 147 case IIO_CAPACITANCE: 148 case IIO_ALTVOLTAGE: 149 case IIO_CCT: 150 case IIO_PRESSURE: 151 case IIO_HUMIDITYRELATIVE: 152 case IIO_ACTIVITY: 153 case IIO_STEPS: 154 case IIO_ENERGY: 155 case IIO_DISTANCE: 156 case IIO_VELOCITY: 157 case IIO_CONCENTRATION: 158 case IIO_RESISTANCE: 159 case IIO_PH: 160 case IIO_UVINDEX: 161 case IIO_GRAVITY: 162 case IIO_POSITIONRELATIVE: 163 case IIO_PHASE: 164 case IIO_MASSCONCENTRATION: 165 break; 166 default: 167 return false; 168 } 169 170 switch (mod) { 171 case IIO_NO_MOD: 172 case IIO_MOD_X: 173 case IIO_MOD_Y: 174 case IIO_MOD_Z: 175 case IIO_MOD_X_AND_Y: 176 case IIO_MOD_X_AND_Z: 177 case IIO_MOD_Y_AND_Z: 178 case IIO_MOD_X_AND_Y_AND_Z: 179 case IIO_MOD_X_OR_Y: 180 case IIO_MOD_X_OR_Z: 181 case IIO_MOD_Y_OR_Z: 182 case IIO_MOD_X_OR_Y_OR_Z: 183 case IIO_MOD_LIGHT_BOTH: 184 case IIO_MOD_LIGHT_IR: 185 case IIO_MOD_ROOT_SUM_SQUARED_X_Y: 186 case IIO_MOD_SUM_SQUARED_X_Y_Z: 187 case IIO_MOD_LIGHT_CLEAR: 188 case IIO_MOD_LIGHT_RED: 189 case IIO_MOD_LIGHT_GREEN: 190 case IIO_MOD_LIGHT_BLUE: 191 case IIO_MOD_LIGHT_UV: 192 case IIO_MOD_LIGHT_DUV: 193 case IIO_MOD_QUATERNION: 194 case IIO_MOD_TEMP_AMBIENT: 195 case IIO_MOD_TEMP_OBJECT: 196 case IIO_MOD_NORTH_MAGN: 197 case IIO_MOD_NORTH_TRUE: 198 case IIO_MOD_NORTH_MAGN_TILT_COMP: 199 case IIO_MOD_NORTH_TRUE_TILT_COMP: 200 case IIO_MOD_RUNNING: 201 case IIO_MOD_JOGGING: 202 case IIO_MOD_WALKING: 203 case IIO_MOD_STILL: 204 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z: 205 case IIO_MOD_I: 206 case IIO_MOD_Q: 207 case IIO_MOD_CO2: 208 case IIO_MOD_ETHANOL: 209 case IIO_MOD_H2: 210 case IIO_MOD_VOC: 211 case IIO_MOD_PM1: 212 case IIO_MOD_PM2P5: 213 case IIO_MOD_PM4: 214 case IIO_MOD_PM10: 215 case IIO_MOD_O2: 216 break; 217 default: 218 return false; 219 } 220 221 switch (ev_type) { 222 case IIO_EV_TYPE_THRESH: 223 case IIO_EV_TYPE_MAG: 224 case IIO_EV_TYPE_ROC: 225 case IIO_EV_TYPE_THRESH_ADAPTIVE: 226 case IIO_EV_TYPE_MAG_ADAPTIVE: 227 case IIO_EV_TYPE_CHANGE: 228 break; 229 default: 230 return false; 231 } 232 233 switch (dir) { 234 case IIO_EV_DIR_EITHER: 235 case IIO_EV_DIR_RISING: 236 case IIO_EV_DIR_FALLING: 237 case IIO_EV_DIR_NONE: 238 break; 239 default: 240 return false; 241 } 242 243 return true; 244 } 245 246 static void print_event(struct iio_event_data *event) 247 { 248 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 249 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 250 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 251 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 252 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id); 253 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id); 254 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id); 255 256 if (!event_is_known(event)) { 257 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n", 258 event->timestamp, event->id); 259 260 return; 261 } 262 263 printf("Event: time: %lld, type: %s", event->timestamp, 264 iio_chan_type_name_spec[type]); 265 266 if (mod != IIO_NO_MOD) 267 printf("(%s)", iio_modifier_names[mod]); 268 269 if (chan >= 0) { 270 printf(", channel: %d", chan); 271 if (diff && chan2 >= 0) 272 printf("-%d", chan2); 273 } 274 275 printf(", evtype: %s", iio_ev_type_text[ev_type]); 276 277 if (dir != IIO_EV_DIR_NONE) 278 printf(", direction: %s", iio_ev_dir_text[dir]); 279 280 printf("\n"); 281 } 282 283 int main(int argc, char **argv) 284 { 285 struct iio_event_data event; 286 const char *device_name; 287 char *chrdev_name; 288 int ret; 289 int dev_num; 290 int fd, event_fd; 291 292 if (argc <= 1) { 293 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]); 294 return -1; 295 } 296 297 device_name = argv[1]; 298 299 dev_num = find_type_by_name(device_name, "iio:device"); 300 if (dev_num >= 0) { 301 printf("Found IIO device with name %s with device number %d\n", 302 device_name, dev_num); 303 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num); 304 if (ret < 0) 305 return -ENOMEM; 306 } else { 307 /* 308 * If we can't find an IIO device by name assume device_name is 309 * an IIO chrdev 310 */ 311 chrdev_name = strdup(device_name); 312 if (!chrdev_name) 313 return -ENOMEM; 314 } 315 316 fd = open(chrdev_name, 0); 317 if (fd == -1) { 318 ret = -errno; 319 fprintf(stderr, "Failed to open %s\n", chrdev_name); 320 goto error_free_chrdev_name; 321 } 322 323 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd); 324 if (ret == -1 || event_fd == -1) { 325 ret = -errno; 326 if (ret == -ENODEV) 327 fprintf(stderr, 328 "This device does not support events\n"); 329 else 330 fprintf(stderr, "Failed to retrieve event fd\n"); 331 if (close(fd) == -1) 332 perror("Failed to close character device file"); 333 334 goto error_free_chrdev_name; 335 } 336 337 if (close(fd) == -1) { 338 ret = -errno; 339 goto error_free_chrdev_name; 340 } 341 342 while (true) { 343 ret = read(event_fd, &event, sizeof(event)); 344 if (ret == -1) { 345 if (errno == EAGAIN) { 346 fprintf(stderr, "nothing available\n"); 347 continue; 348 } else { 349 ret = -errno; 350 perror("Failed to read event from device"); 351 break; 352 } 353 } 354 355 if (ret != sizeof(event)) { 356 fprintf(stderr, "Reading event failed!\n"); 357 ret = -EIO; 358 break; 359 } 360 361 print_event(&event); 362 } 363 364 if (close(event_fd) == -1) 365 perror("Failed to close event file"); 366 367 error_free_chrdev_name: 368 free(chrdev_name); 369 370 return ret; 371 } 372