1 /* Industrialio event test code. 2 * 3 * Copyright (c) 2011-2012 Lars-Peter Clausen <lars@metafoo.de> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is primarily intended as an example application. 10 * Reads the current buffer setup from sysfs and starts a short capture 11 * from the specified device, pretty printing the result after appropriate 12 * conversion. 13 * 14 * Usage: 15 * iio_event_monitor <device_name> 16 */ 17 18 #include <unistd.h> 19 #include <stdlib.h> 20 #include <stdbool.h> 21 #include <stdio.h> 22 #include <errno.h> 23 #include <string.h> 24 #include <poll.h> 25 #include <fcntl.h> 26 #include <sys/ioctl.h> 27 #include "iio_utils.h" 28 #include <linux/iio/events.h> 29 #include <linux/iio/types.h> 30 31 static const char * const iio_chan_type_name_spec[] = { 32 [IIO_VOLTAGE] = "voltage", 33 [IIO_CURRENT] = "current", 34 [IIO_POWER] = "power", 35 [IIO_ACCEL] = "accel", 36 [IIO_ANGL_VEL] = "anglvel", 37 [IIO_MAGN] = "magn", 38 [IIO_LIGHT] = "illuminance", 39 [IIO_INTENSITY] = "intensity", 40 [IIO_PROXIMITY] = "proximity", 41 [IIO_TEMP] = "temp", 42 [IIO_INCLI] = "incli", 43 [IIO_ROT] = "rot", 44 [IIO_ANGL] = "angl", 45 [IIO_TIMESTAMP] = "timestamp", 46 [IIO_CAPACITANCE] = "capacitance", 47 [IIO_ALTVOLTAGE] = "altvoltage", 48 [IIO_CCT] = "cct", 49 [IIO_PRESSURE] = "pressure", 50 [IIO_HUMIDITYRELATIVE] = "humidityrelative", 51 [IIO_ACTIVITY] = "activity", 52 [IIO_STEPS] = "steps", 53 [IIO_ENERGY] = "energy", 54 [IIO_DISTANCE] = "distance", 55 [IIO_VELOCITY] = "velocity", 56 [IIO_CONCENTRATION] = "concentration", 57 [IIO_RESISTANCE] = "resistance", 58 [IIO_PH] = "ph", 59 [IIO_UVINDEX] = "uvindex", 60 [IIO_GRAVITY] = "gravity", 61 [IIO_POSITIONRELATIVE] = "positionrelative", 62 [IIO_PHASE] = "phase", 63 }; 64 65 static const char * const iio_ev_type_text[] = { 66 [IIO_EV_TYPE_THRESH] = "thresh", 67 [IIO_EV_TYPE_MAG] = "mag", 68 [IIO_EV_TYPE_ROC] = "roc", 69 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 70 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 71 [IIO_EV_TYPE_CHANGE] = "change", 72 }; 73 74 static const char * const iio_ev_dir_text[] = { 75 [IIO_EV_DIR_EITHER] = "either", 76 [IIO_EV_DIR_RISING] = "rising", 77 [IIO_EV_DIR_FALLING] = "falling" 78 }; 79 80 static const char * const iio_modifier_names[] = { 81 [IIO_MOD_X] = "x", 82 [IIO_MOD_Y] = "y", 83 [IIO_MOD_Z] = "z", 84 [IIO_MOD_X_AND_Y] = "x&y", 85 [IIO_MOD_X_AND_Z] = "x&z", 86 [IIO_MOD_Y_AND_Z] = "y&z", 87 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 88 [IIO_MOD_X_OR_Y] = "x|y", 89 [IIO_MOD_X_OR_Z] = "x|z", 90 [IIO_MOD_Y_OR_Z] = "y|z", 91 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 92 [IIO_MOD_LIGHT_BOTH] = "both", 93 [IIO_MOD_LIGHT_IR] = "ir", 94 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 95 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 96 [IIO_MOD_LIGHT_CLEAR] = "clear", 97 [IIO_MOD_LIGHT_RED] = "red", 98 [IIO_MOD_LIGHT_GREEN] = "green", 99 [IIO_MOD_LIGHT_BLUE] = "blue", 100 [IIO_MOD_LIGHT_UV] = "uv", 101 [IIO_MOD_LIGHT_DUV] = "duv", 102 [IIO_MOD_QUATERNION] = "quaternion", 103 [IIO_MOD_TEMP_AMBIENT] = "ambient", 104 [IIO_MOD_TEMP_OBJECT] = "object", 105 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 106 [IIO_MOD_NORTH_TRUE] = "from_north_true", 107 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 108 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 109 [IIO_MOD_RUNNING] = "running", 110 [IIO_MOD_JOGGING] = "jogging", 111 [IIO_MOD_WALKING] = "walking", 112 [IIO_MOD_STILL] = "still", 113 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 114 [IIO_MOD_I] = "i", 115 [IIO_MOD_Q] = "q", 116 [IIO_MOD_CO2] = "co2", 117 [IIO_MOD_VOC] = "voc", 118 }; 119 120 static bool event_is_known(struct iio_event_data *event) 121 { 122 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 123 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 124 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 125 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 126 127 switch (type) { 128 case IIO_VOLTAGE: 129 case IIO_CURRENT: 130 case IIO_POWER: 131 case IIO_ACCEL: 132 case IIO_ANGL_VEL: 133 case IIO_MAGN: 134 case IIO_LIGHT: 135 case IIO_INTENSITY: 136 case IIO_PROXIMITY: 137 case IIO_TEMP: 138 case IIO_INCLI: 139 case IIO_ROT: 140 case IIO_ANGL: 141 case IIO_TIMESTAMP: 142 case IIO_CAPACITANCE: 143 case IIO_ALTVOLTAGE: 144 case IIO_CCT: 145 case IIO_PRESSURE: 146 case IIO_HUMIDITYRELATIVE: 147 case IIO_ACTIVITY: 148 case IIO_STEPS: 149 case IIO_ENERGY: 150 case IIO_DISTANCE: 151 case IIO_VELOCITY: 152 case IIO_CONCENTRATION: 153 case IIO_RESISTANCE: 154 case IIO_PH: 155 case IIO_UVINDEX: 156 case IIO_GRAVITY: 157 case IIO_POSITIONRELATIVE: 158 case IIO_PHASE: 159 break; 160 default: 161 return false; 162 } 163 164 switch (mod) { 165 case IIO_NO_MOD: 166 case IIO_MOD_X: 167 case IIO_MOD_Y: 168 case IIO_MOD_Z: 169 case IIO_MOD_X_AND_Y: 170 case IIO_MOD_X_AND_Z: 171 case IIO_MOD_Y_AND_Z: 172 case IIO_MOD_X_AND_Y_AND_Z: 173 case IIO_MOD_X_OR_Y: 174 case IIO_MOD_X_OR_Z: 175 case IIO_MOD_Y_OR_Z: 176 case IIO_MOD_X_OR_Y_OR_Z: 177 case IIO_MOD_LIGHT_BOTH: 178 case IIO_MOD_LIGHT_IR: 179 case IIO_MOD_ROOT_SUM_SQUARED_X_Y: 180 case IIO_MOD_SUM_SQUARED_X_Y_Z: 181 case IIO_MOD_LIGHT_CLEAR: 182 case IIO_MOD_LIGHT_RED: 183 case IIO_MOD_LIGHT_GREEN: 184 case IIO_MOD_LIGHT_BLUE: 185 case IIO_MOD_LIGHT_UV: 186 case IIO_MOD_LIGHT_DUV: 187 case IIO_MOD_QUATERNION: 188 case IIO_MOD_TEMP_AMBIENT: 189 case IIO_MOD_TEMP_OBJECT: 190 case IIO_MOD_NORTH_MAGN: 191 case IIO_MOD_NORTH_TRUE: 192 case IIO_MOD_NORTH_MAGN_TILT_COMP: 193 case IIO_MOD_NORTH_TRUE_TILT_COMP: 194 case IIO_MOD_RUNNING: 195 case IIO_MOD_JOGGING: 196 case IIO_MOD_WALKING: 197 case IIO_MOD_STILL: 198 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z: 199 case IIO_MOD_I: 200 case IIO_MOD_Q: 201 case IIO_MOD_CO2: 202 case IIO_MOD_VOC: 203 break; 204 default: 205 return false; 206 } 207 208 switch (ev_type) { 209 case IIO_EV_TYPE_THRESH: 210 case IIO_EV_TYPE_MAG: 211 case IIO_EV_TYPE_ROC: 212 case IIO_EV_TYPE_THRESH_ADAPTIVE: 213 case IIO_EV_TYPE_MAG_ADAPTIVE: 214 case IIO_EV_TYPE_CHANGE: 215 break; 216 default: 217 return false; 218 } 219 220 switch (dir) { 221 case IIO_EV_DIR_EITHER: 222 case IIO_EV_DIR_RISING: 223 case IIO_EV_DIR_FALLING: 224 case IIO_EV_DIR_NONE: 225 break; 226 default: 227 return false; 228 } 229 230 return true; 231 } 232 233 static void print_event(struct iio_event_data *event) 234 { 235 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 236 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 237 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 238 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 239 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id); 240 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id); 241 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id); 242 243 if (!event_is_known(event)) { 244 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n", 245 event->timestamp, event->id); 246 247 return; 248 } 249 250 printf("Event: time: %lld, type: %s", event->timestamp, 251 iio_chan_type_name_spec[type]); 252 253 if (mod != IIO_NO_MOD) 254 printf("(%s)", iio_modifier_names[mod]); 255 256 if (chan >= 0) { 257 printf(", channel: %d", chan); 258 if (diff && chan2 >= 0) 259 printf("-%d", chan2); 260 } 261 262 printf(", evtype: %s", iio_ev_type_text[ev_type]); 263 264 if (dir != IIO_EV_DIR_NONE) 265 printf(", direction: %s", iio_ev_dir_text[dir]); 266 267 printf("\n"); 268 } 269 270 int main(int argc, char **argv) 271 { 272 struct iio_event_data event; 273 const char *device_name; 274 char *chrdev_name; 275 int ret; 276 int dev_num; 277 int fd, event_fd; 278 279 if (argc <= 1) { 280 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]); 281 return -1; 282 } 283 284 device_name = argv[1]; 285 286 dev_num = find_type_by_name(device_name, "iio:device"); 287 if (dev_num >= 0) { 288 printf("Found IIO device with name %s with device number %d\n", 289 device_name, dev_num); 290 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num); 291 if (ret < 0) 292 return -ENOMEM; 293 } else { 294 /* 295 * If we can't find an IIO device by name assume device_name is 296 * an IIO chrdev 297 */ 298 chrdev_name = strdup(device_name); 299 if (!chrdev_name) 300 return -ENOMEM; 301 } 302 303 fd = open(chrdev_name, 0); 304 if (fd == -1) { 305 ret = -errno; 306 fprintf(stderr, "Failed to open %s\n", chrdev_name); 307 goto error_free_chrdev_name; 308 } 309 310 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd); 311 if (ret == -1 || event_fd == -1) { 312 ret = -errno; 313 if (ret == -ENODEV) 314 fprintf(stderr, 315 "This device does not support events\n"); 316 else 317 fprintf(stderr, "Failed to retrieve event fd\n"); 318 if (close(fd) == -1) 319 perror("Failed to close character device file"); 320 321 goto error_free_chrdev_name; 322 } 323 324 if (close(fd) == -1) { 325 ret = -errno; 326 goto error_free_chrdev_name; 327 } 328 329 while (true) { 330 ret = read(event_fd, &event, sizeof(event)); 331 if (ret == -1) { 332 if (errno == EAGAIN) { 333 fprintf(stderr, "nothing available\n"); 334 continue; 335 } else { 336 ret = -errno; 337 perror("Failed to read event from device"); 338 break; 339 } 340 } 341 342 if (ret != sizeof(event)) { 343 fprintf(stderr, "Reading event failed!\n"); 344 ret = -EIO; 345 break; 346 } 347 348 print_event(&event); 349 } 350 351 if (close(event_fd) == -1) 352 perror("Failed to close event file"); 353 354 error_free_chrdev_name: 355 free(chrdev_name); 356 357 return ret; 358 } 359