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