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 }; 123 124 static bool event_is_known(struct iio_event_data *event) 125 { 126 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 127 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 128 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 129 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 130 131 switch (type) { 132 case IIO_VOLTAGE: 133 case IIO_CURRENT: 134 case IIO_POWER: 135 case IIO_ACCEL: 136 case IIO_ANGL_VEL: 137 case IIO_MAGN: 138 case IIO_LIGHT: 139 case IIO_INTENSITY: 140 case IIO_PROXIMITY: 141 case IIO_TEMP: 142 case IIO_INCLI: 143 case IIO_ROT: 144 case IIO_ANGL: 145 case IIO_TIMESTAMP: 146 case IIO_CAPACITANCE: 147 case IIO_ALTVOLTAGE: 148 case IIO_CCT: 149 case IIO_PRESSURE: 150 case IIO_HUMIDITYRELATIVE: 151 case IIO_ACTIVITY: 152 case IIO_STEPS: 153 case IIO_ENERGY: 154 case IIO_DISTANCE: 155 case IIO_VELOCITY: 156 case IIO_CONCENTRATION: 157 case IIO_RESISTANCE: 158 case IIO_PH: 159 case IIO_UVINDEX: 160 case IIO_GRAVITY: 161 case IIO_POSITIONRELATIVE: 162 case IIO_PHASE: 163 case IIO_MASSCONCENTRATION: 164 break; 165 default: 166 return false; 167 } 168 169 switch (mod) { 170 case IIO_NO_MOD: 171 case IIO_MOD_X: 172 case IIO_MOD_Y: 173 case IIO_MOD_Z: 174 case IIO_MOD_X_AND_Y: 175 case IIO_MOD_X_AND_Z: 176 case IIO_MOD_Y_AND_Z: 177 case IIO_MOD_X_AND_Y_AND_Z: 178 case IIO_MOD_X_OR_Y: 179 case IIO_MOD_X_OR_Z: 180 case IIO_MOD_Y_OR_Z: 181 case IIO_MOD_X_OR_Y_OR_Z: 182 case IIO_MOD_LIGHT_BOTH: 183 case IIO_MOD_LIGHT_IR: 184 case IIO_MOD_ROOT_SUM_SQUARED_X_Y: 185 case IIO_MOD_SUM_SQUARED_X_Y_Z: 186 case IIO_MOD_LIGHT_CLEAR: 187 case IIO_MOD_LIGHT_RED: 188 case IIO_MOD_LIGHT_GREEN: 189 case IIO_MOD_LIGHT_BLUE: 190 case IIO_MOD_LIGHT_UV: 191 case IIO_MOD_LIGHT_DUV: 192 case IIO_MOD_QUATERNION: 193 case IIO_MOD_TEMP_AMBIENT: 194 case IIO_MOD_TEMP_OBJECT: 195 case IIO_MOD_NORTH_MAGN: 196 case IIO_MOD_NORTH_TRUE: 197 case IIO_MOD_NORTH_MAGN_TILT_COMP: 198 case IIO_MOD_NORTH_TRUE_TILT_COMP: 199 case IIO_MOD_RUNNING: 200 case IIO_MOD_JOGGING: 201 case IIO_MOD_WALKING: 202 case IIO_MOD_STILL: 203 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z: 204 case IIO_MOD_I: 205 case IIO_MOD_Q: 206 case IIO_MOD_CO2: 207 case IIO_MOD_ETHANOL: 208 case IIO_MOD_H2: 209 case IIO_MOD_VOC: 210 case IIO_MOD_PM1: 211 case IIO_MOD_PM2P5: 212 case IIO_MOD_PM4: 213 case IIO_MOD_PM10: 214 break; 215 default: 216 return false; 217 } 218 219 switch (ev_type) { 220 case IIO_EV_TYPE_THRESH: 221 case IIO_EV_TYPE_MAG: 222 case IIO_EV_TYPE_ROC: 223 case IIO_EV_TYPE_THRESH_ADAPTIVE: 224 case IIO_EV_TYPE_MAG_ADAPTIVE: 225 case IIO_EV_TYPE_CHANGE: 226 break; 227 default: 228 return false; 229 } 230 231 switch (dir) { 232 case IIO_EV_DIR_EITHER: 233 case IIO_EV_DIR_RISING: 234 case IIO_EV_DIR_FALLING: 235 case IIO_EV_DIR_NONE: 236 break; 237 default: 238 return false; 239 } 240 241 return true; 242 } 243 244 static void print_event(struct iio_event_data *event) 245 { 246 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 247 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 248 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 249 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 250 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id); 251 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id); 252 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id); 253 254 if (!event_is_known(event)) { 255 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n", 256 event->timestamp, event->id); 257 258 return; 259 } 260 261 printf("Event: time: %lld, type: %s", event->timestamp, 262 iio_chan_type_name_spec[type]); 263 264 if (mod != IIO_NO_MOD) 265 printf("(%s)", iio_modifier_names[mod]); 266 267 if (chan >= 0) { 268 printf(", channel: %d", chan); 269 if (diff && chan2 >= 0) 270 printf("-%d", chan2); 271 } 272 273 printf(", evtype: %s", iio_ev_type_text[ev_type]); 274 275 if (dir != IIO_EV_DIR_NONE) 276 printf(", direction: %s", iio_ev_dir_text[dir]); 277 278 printf("\n"); 279 } 280 281 int main(int argc, char **argv) 282 { 283 struct iio_event_data event; 284 const char *device_name; 285 char *chrdev_name; 286 int ret; 287 int dev_num; 288 int fd, event_fd; 289 290 if (argc <= 1) { 291 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]); 292 return -1; 293 } 294 295 device_name = argv[1]; 296 297 dev_num = find_type_by_name(device_name, "iio:device"); 298 if (dev_num >= 0) { 299 printf("Found IIO device with name %s with device number %d\n", 300 device_name, dev_num); 301 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num); 302 if (ret < 0) 303 return -ENOMEM; 304 } else { 305 /* 306 * If we can't find an IIO device by name assume device_name is 307 * an IIO chrdev 308 */ 309 chrdev_name = strdup(device_name); 310 if (!chrdev_name) 311 return -ENOMEM; 312 } 313 314 fd = open(chrdev_name, 0); 315 if (fd == -1) { 316 ret = -errno; 317 fprintf(stderr, "Failed to open %s\n", chrdev_name); 318 goto error_free_chrdev_name; 319 } 320 321 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd); 322 if (ret == -1 || event_fd == -1) { 323 ret = -errno; 324 if (ret == -ENODEV) 325 fprintf(stderr, 326 "This device does not support events\n"); 327 else 328 fprintf(stderr, "Failed to retrieve event fd\n"); 329 if (close(fd) == -1) 330 perror("Failed to close character device file"); 331 332 goto error_free_chrdev_name; 333 } 334 335 if (close(fd) == -1) { 336 ret = -errno; 337 goto error_free_chrdev_name; 338 } 339 340 while (true) { 341 ret = read(event_fd, &event, sizeof(event)); 342 if (ret == -1) { 343 if (errno == EAGAIN) { 344 fprintf(stderr, "nothing available\n"); 345 continue; 346 } else { 347 ret = -errno; 348 perror("Failed to read event from device"); 349 break; 350 } 351 } 352 353 if (ret != sizeof(event)) { 354 fprintf(stderr, "Reading event failed!\n"); 355 ret = -EIO; 356 break; 357 } 358 359 print_event(&event); 360 } 361 362 if (close(event_fd) == -1) 363 perror("Failed to close event file"); 364 365 error_free_chrdev_name: 366 free(chrdev_name); 367 368 return ret; 369 } 370