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 }; 57 58 static const char * const iio_ev_type_text[] = { 59 [IIO_EV_TYPE_THRESH] = "thresh", 60 [IIO_EV_TYPE_MAG] = "mag", 61 [IIO_EV_TYPE_ROC] = "roc", 62 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 63 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 64 [IIO_EV_TYPE_CHANGE] = "change", 65 }; 66 67 static const char * const iio_ev_dir_text[] = { 68 [IIO_EV_DIR_EITHER] = "either", 69 [IIO_EV_DIR_RISING] = "rising", 70 [IIO_EV_DIR_FALLING] = "falling" 71 }; 72 73 static const char * const iio_modifier_names[] = { 74 [IIO_MOD_X] = "x", 75 [IIO_MOD_Y] = "y", 76 [IIO_MOD_Z] = "z", 77 [IIO_MOD_X_AND_Y] = "x&y", 78 [IIO_MOD_X_AND_Z] = "x&z", 79 [IIO_MOD_Y_AND_Z] = "y&z", 80 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 81 [IIO_MOD_X_OR_Y] = "x|y", 82 [IIO_MOD_X_OR_Z] = "x|z", 83 [IIO_MOD_Y_OR_Z] = "y|z", 84 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 85 [IIO_MOD_LIGHT_BOTH] = "both", 86 [IIO_MOD_LIGHT_IR] = "ir", 87 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 88 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 89 [IIO_MOD_LIGHT_CLEAR] = "clear", 90 [IIO_MOD_LIGHT_RED] = "red", 91 [IIO_MOD_LIGHT_GREEN] = "green", 92 [IIO_MOD_LIGHT_BLUE] = "blue", 93 [IIO_MOD_QUATERNION] = "quaternion", 94 [IIO_MOD_TEMP_AMBIENT] = "ambient", 95 [IIO_MOD_TEMP_OBJECT] = "object", 96 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 97 [IIO_MOD_NORTH_TRUE] = "from_north_true", 98 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 99 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 100 [IIO_MOD_RUNNING] = "running", 101 [IIO_MOD_JOGGING] = "jogging", 102 [IIO_MOD_WALKING] = "walking", 103 [IIO_MOD_STILL] = "still", 104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 105 }; 106 107 static bool event_is_known(struct iio_event_data *event) 108 { 109 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 110 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 111 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 112 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 113 114 switch (type) { 115 case IIO_VOLTAGE: 116 case IIO_CURRENT: 117 case IIO_POWER: 118 case IIO_ACCEL: 119 case IIO_ANGL_VEL: 120 case IIO_MAGN: 121 case IIO_LIGHT: 122 case IIO_INTENSITY: 123 case IIO_PROXIMITY: 124 case IIO_TEMP: 125 case IIO_INCLI: 126 case IIO_ROT: 127 case IIO_ANGL: 128 case IIO_TIMESTAMP: 129 case IIO_CAPACITANCE: 130 case IIO_ALTVOLTAGE: 131 case IIO_CCT: 132 case IIO_PRESSURE: 133 case IIO_HUMIDITYRELATIVE: 134 case IIO_ACTIVITY: 135 case IIO_STEPS: 136 case IIO_ENERGY: 137 case IIO_DISTANCE: 138 case IIO_VELOCITY: 139 break; 140 default: 141 return false; 142 } 143 144 switch (mod) { 145 case IIO_NO_MOD: 146 case IIO_MOD_X: 147 case IIO_MOD_Y: 148 case IIO_MOD_Z: 149 case IIO_MOD_X_AND_Y: 150 case IIO_MOD_X_AND_Z: 151 case IIO_MOD_Y_AND_Z: 152 case IIO_MOD_X_AND_Y_AND_Z: 153 case IIO_MOD_X_OR_Y: 154 case IIO_MOD_X_OR_Z: 155 case IIO_MOD_Y_OR_Z: 156 case IIO_MOD_X_OR_Y_OR_Z: 157 case IIO_MOD_LIGHT_BOTH: 158 case IIO_MOD_LIGHT_IR: 159 case IIO_MOD_ROOT_SUM_SQUARED_X_Y: 160 case IIO_MOD_SUM_SQUARED_X_Y_Z: 161 case IIO_MOD_LIGHT_CLEAR: 162 case IIO_MOD_LIGHT_RED: 163 case IIO_MOD_LIGHT_GREEN: 164 case IIO_MOD_LIGHT_BLUE: 165 case IIO_MOD_QUATERNION: 166 case IIO_MOD_TEMP_AMBIENT: 167 case IIO_MOD_TEMP_OBJECT: 168 case IIO_MOD_NORTH_MAGN: 169 case IIO_MOD_NORTH_TRUE: 170 case IIO_MOD_NORTH_MAGN_TILT_COMP: 171 case IIO_MOD_NORTH_TRUE_TILT_COMP: 172 case IIO_MOD_RUNNING: 173 case IIO_MOD_JOGGING: 174 case IIO_MOD_WALKING: 175 case IIO_MOD_STILL: 176 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z: 177 break; 178 default: 179 return false; 180 } 181 182 switch (ev_type) { 183 case IIO_EV_TYPE_THRESH: 184 case IIO_EV_TYPE_MAG: 185 case IIO_EV_TYPE_ROC: 186 case IIO_EV_TYPE_THRESH_ADAPTIVE: 187 case IIO_EV_TYPE_MAG_ADAPTIVE: 188 case IIO_EV_TYPE_CHANGE: 189 break; 190 default: 191 return false; 192 } 193 194 switch (dir) { 195 case IIO_EV_DIR_EITHER: 196 case IIO_EV_DIR_RISING: 197 case IIO_EV_DIR_FALLING: 198 case IIO_EV_DIR_NONE: 199 break; 200 default: 201 return false; 202 } 203 204 return true; 205 } 206 207 static void print_event(struct iio_event_data *event) 208 { 209 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id); 210 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id); 211 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id); 212 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id); 213 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id); 214 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id); 215 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id); 216 217 if (!event_is_known(event)) { 218 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n", 219 event->timestamp, event->id); 220 221 return; 222 } 223 224 printf("Event: time: %lld, type: %s", event->timestamp, 225 iio_chan_type_name_spec[type]); 226 227 if (mod != IIO_NO_MOD) 228 printf("(%s)", iio_modifier_names[mod]); 229 230 if (chan >= 0) { 231 printf(", channel: %d", chan); 232 if (diff && chan2 >= 0) 233 printf("-%d", chan2); 234 } 235 236 printf(", evtype: %s", iio_ev_type_text[ev_type]); 237 238 if (dir != IIO_EV_DIR_NONE) 239 printf(", direction: %s", iio_ev_dir_text[dir]); 240 241 printf("\n"); 242 } 243 244 int main(int argc, char **argv) 245 { 246 struct iio_event_data event; 247 const char *device_name; 248 char *chrdev_name; 249 int ret; 250 int dev_num; 251 int fd, event_fd; 252 253 if (argc <= 1) { 254 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]); 255 return -1; 256 } 257 258 device_name = argv[1]; 259 260 dev_num = find_type_by_name(device_name, "iio:device"); 261 if (dev_num >= 0) { 262 printf("Found IIO device with name %s with device number %d\n", 263 device_name, dev_num); 264 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num); 265 if (ret < 0) 266 return -ENOMEM; 267 } else { 268 /* 269 * If we can't find an IIO device by name assume device_name is 270 * an IIO chrdev 271 */ 272 chrdev_name = strdup(device_name); 273 if (!chrdev_name) 274 return -ENOMEM; 275 } 276 277 fd = open(chrdev_name, 0); 278 if (fd == -1) { 279 ret = -errno; 280 fprintf(stderr, "Failed to open %s\n", chrdev_name); 281 goto error_free_chrdev_name; 282 } 283 284 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd); 285 if (ret == -1 || event_fd == -1) { 286 ret = -errno; 287 if (ret == -ENODEV) 288 fprintf(stderr, 289 "This device does not support events\n"); 290 else 291 fprintf(stderr, "Failed to retrieve event fd\n"); 292 if (close(fd) == -1) 293 perror("Failed to close character device file"); 294 295 goto error_free_chrdev_name; 296 } 297 298 if (close(fd) == -1) { 299 ret = -errno; 300 goto error_free_chrdev_name; 301 } 302 303 while (true) { 304 ret = read(event_fd, &event, sizeof(event)); 305 if (ret == -1) { 306 if (errno == EAGAIN) { 307 fprintf(stderr, "nothing available\n"); 308 continue; 309 } else { 310 ret = -errno; 311 perror("Failed to read event from device"); 312 break; 313 } 314 } 315 316 if (ret != sizeof(event)) { 317 fprintf(stderr, "Reading event failed!\n"); 318 ret = -EIO; 319 break; 320 } 321 322 print_event(&event); 323 } 324 325 if (close(event_fd) == -1) 326 perror("Failed to close event file"); 327 328 error_free_chrdev_name: 329 free(chrdev_name); 330 331 return ret; 332 } 333