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 <dirent.h>
18 #include <stdbool.h>
19 #include <stdio.h>
20 #include <errno.h>
21 #include <string.h>
22 #include <poll.h>
23 #include <fcntl.h>
24 #include <sys/ioctl.h>
25 #include "iio_utils.h"
26 #include <linux/iio/events.h>
27 #include <linux/iio/types.h>
28
29 static const char * const iio_chan_type_name_spec[] = {
30 [IIO_VOLTAGE] = "voltage",
31 [IIO_CURRENT] = "current",
32 [IIO_POWER] = "power",
33 [IIO_ACCEL] = "accel",
34 [IIO_ANGL_VEL] = "anglvel",
35 [IIO_MAGN] = "magn",
36 [IIO_LIGHT] = "illuminance",
37 [IIO_INTENSITY] = "intensity",
38 [IIO_PROXIMITY] = "proximity",
39 [IIO_TEMP] = "temp",
40 [IIO_INCLI] = "incli",
41 [IIO_ROT] = "rot",
42 [IIO_ANGL] = "angl",
43 [IIO_TIMESTAMP] = "timestamp",
44 [IIO_CAPACITANCE] = "capacitance",
45 [IIO_ALTVOLTAGE] = "altvoltage",
46 [IIO_CCT] = "cct",
47 [IIO_PRESSURE] = "pressure",
48 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
49 [IIO_ACTIVITY] = "activity",
50 [IIO_STEPS] = "steps",
51 [IIO_ENERGY] = "energy",
52 [IIO_DISTANCE] = "distance",
53 [IIO_VELOCITY] = "velocity",
54 [IIO_CONCENTRATION] = "concentration",
55 [IIO_RESISTANCE] = "resistance",
56 [IIO_PH] = "ph",
57 [IIO_UVINDEX] = "uvindex",
58 [IIO_GRAVITY] = "gravity",
59 [IIO_POSITIONRELATIVE] = "positionrelative",
60 [IIO_PHASE] = "phase",
61 [IIO_MASSCONCENTRATION] = "massconcentration",
62 [IIO_DELTA_ANGL] = "deltaangl",
63 [IIO_DELTA_VELOCITY] = "deltavelocity",
64 [IIO_COLORTEMP] = "colortemp",
65 [IIO_CHROMATICITY] = "chromaticity",
66 [IIO_ATTENTION] = "attention",
67 };
68
69 static const char * const iio_ev_type_text[] = {
70 [IIO_EV_TYPE_THRESH] = "thresh",
71 [IIO_EV_TYPE_MAG] = "mag",
72 [IIO_EV_TYPE_ROC] = "roc",
73 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
74 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
75 [IIO_EV_TYPE_CHANGE] = "change",
76 [IIO_EV_TYPE_MAG_REFERENCED] = "mag_referenced",
77 [IIO_EV_TYPE_GESTURE] = "gesture",
78 [IIO_EV_TYPE_FAULT] = "fault",
79 };
80
81 static const char * const iio_ev_dir_text[] = {
82 [IIO_EV_DIR_EITHER] = "either",
83 [IIO_EV_DIR_RISING] = "rising",
84 [IIO_EV_DIR_FALLING] = "falling",
85 [IIO_EV_DIR_SINGLETAP] = "singletap",
86 [IIO_EV_DIR_DOUBLETAP] = "doubletap",
87 [IIO_EV_DIR_FAULT_OPENWIRE] = "openwire",
88 };
89
90 static const char * const iio_modifier_names[] = {
91 [IIO_MOD_X] = "x",
92 [IIO_MOD_Y] = "y",
93 [IIO_MOD_Z] = "z",
94 [IIO_MOD_X_AND_Y] = "x&y",
95 [IIO_MOD_X_AND_Z] = "x&z",
96 [IIO_MOD_Y_AND_Z] = "y&z",
97 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
98 [IIO_MOD_X_OR_Y] = "x|y",
99 [IIO_MOD_X_OR_Z] = "x|z",
100 [IIO_MOD_Y_OR_Z] = "y|z",
101 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
102 [IIO_MOD_LIGHT_BOTH] = "both",
103 [IIO_MOD_LIGHT_IR] = "ir",
104 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
105 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
106 [IIO_MOD_LIGHT_CLEAR] = "clear",
107 [IIO_MOD_LIGHT_RED] = "red",
108 [IIO_MOD_LIGHT_GREEN] = "green",
109 [IIO_MOD_LIGHT_BLUE] = "blue",
110 [IIO_MOD_LIGHT_UV] = "uv",
111 [IIO_MOD_LIGHT_UVA] = "uva",
112 [IIO_MOD_LIGHT_UVB] = "uvb",
113 [IIO_MOD_LIGHT_DUV] = "duv",
114 [IIO_MOD_QUATERNION] = "quaternion",
115 [IIO_MOD_TEMP_AMBIENT] = "ambient",
116 [IIO_MOD_TEMP_OBJECT] = "object",
117 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
118 [IIO_MOD_NORTH_TRUE] = "from_north_true",
119 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
120 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
121 [IIO_MOD_RUNNING] = "running",
122 [IIO_MOD_JOGGING] = "jogging",
123 [IIO_MOD_WALKING] = "walking",
124 [IIO_MOD_STILL] = "still",
125 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
126 [IIO_MOD_I] = "i",
127 [IIO_MOD_Q] = "q",
128 [IIO_MOD_CO2] = "co2",
129 [IIO_MOD_ETHANOL] = "ethanol",
130 [IIO_MOD_H2] = "h2",
131 [IIO_MOD_VOC] = "voc",
132 [IIO_MOD_PM1] = "pm1",
133 [IIO_MOD_PM2P5] = "pm2p5",
134 [IIO_MOD_PM4] = "pm4",
135 [IIO_MOD_PM10] = "pm10",
136 [IIO_MOD_O2] = "o2",
137 [IIO_MOD_LINEAR_X] = "linear_x",
138 [IIO_MOD_LINEAR_Y] = "linear_y",
139 [IIO_MOD_LINEAR_Z] = "linear_z",
140 [IIO_MOD_PITCH] = "pitch",
141 [IIO_MOD_YAW] = "yaw",
142 [IIO_MOD_ROLL] = "roll",
143 };
144
event_is_known(struct iio_event_data * event)145 static bool event_is_known(struct iio_event_data *event)
146 {
147 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
148 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
149 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
150 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
151
152 switch (type) {
153 case IIO_VOLTAGE:
154 case IIO_CURRENT:
155 case IIO_POWER:
156 case IIO_ACCEL:
157 case IIO_ANGL_VEL:
158 case IIO_MAGN:
159 case IIO_LIGHT:
160 case IIO_INTENSITY:
161 case IIO_PROXIMITY:
162 case IIO_TEMP:
163 case IIO_INCLI:
164 case IIO_ROT:
165 case IIO_ANGL:
166 case IIO_TIMESTAMP:
167 case IIO_CAPACITANCE:
168 case IIO_ALTVOLTAGE:
169 case IIO_CCT:
170 case IIO_PRESSURE:
171 case IIO_HUMIDITYRELATIVE:
172 case IIO_ACTIVITY:
173 case IIO_STEPS:
174 case IIO_ENERGY:
175 case IIO_DISTANCE:
176 case IIO_VELOCITY:
177 case IIO_CONCENTRATION:
178 case IIO_RESISTANCE:
179 case IIO_PH:
180 case IIO_UVINDEX:
181 case IIO_GRAVITY:
182 case IIO_POSITIONRELATIVE:
183 case IIO_PHASE:
184 case IIO_MASSCONCENTRATION:
185 case IIO_DELTA_ANGL:
186 case IIO_DELTA_VELOCITY:
187 case IIO_COLORTEMP:
188 case IIO_CHROMATICITY:
189 case IIO_ATTENTION:
190 break;
191 default:
192 return false;
193 }
194
195 switch (mod) {
196 case IIO_NO_MOD:
197 case IIO_MOD_X:
198 case IIO_MOD_Y:
199 case IIO_MOD_Z:
200 case IIO_MOD_X_AND_Y:
201 case IIO_MOD_X_AND_Z:
202 case IIO_MOD_Y_AND_Z:
203 case IIO_MOD_X_AND_Y_AND_Z:
204 case IIO_MOD_X_OR_Y:
205 case IIO_MOD_X_OR_Z:
206 case IIO_MOD_Y_OR_Z:
207 case IIO_MOD_X_OR_Y_OR_Z:
208 case IIO_MOD_LIGHT_BOTH:
209 case IIO_MOD_LIGHT_IR:
210 case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
211 case IIO_MOD_SUM_SQUARED_X_Y_Z:
212 case IIO_MOD_LIGHT_CLEAR:
213 case IIO_MOD_LIGHT_RED:
214 case IIO_MOD_LIGHT_GREEN:
215 case IIO_MOD_LIGHT_BLUE:
216 case IIO_MOD_LIGHT_UV:
217 case IIO_MOD_LIGHT_DUV:
218 case IIO_MOD_QUATERNION:
219 case IIO_MOD_TEMP_AMBIENT:
220 case IIO_MOD_TEMP_OBJECT:
221 case IIO_MOD_NORTH_MAGN:
222 case IIO_MOD_NORTH_TRUE:
223 case IIO_MOD_NORTH_MAGN_TILT_COMP:
224 case IIO_MOD_NORTH_TRUE_TILT_COMP:
225 case IIO_MOD_RUNNING:
226 case IIO_MOD_JOGGING:
227 case IIO_MOD_WALKING:
228 case IIO_MOD_STILL:
229 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
230 case IIO_MOD_I:
231 case IIO_MOD_Q:
232 case IIO_MOD_CO2:
233 case IIO_MOD_ETHANOL:
234 case IIO_MOD_H2:
235 case IIO_MOD_VOC:
236 case IIO_MOD_PM1:
237 case IIO_MOD_PM2P5:
238 case IIO_MOD_PM4:
239 case IIO_MOD_PM10:
240 case IIO_MOD_O2:
241 break;
242 default:
243 return false;
244 }
245
246 switch (ev_type) {
247 case IIO_EV_TYPE_THRESH:
248 case IIO_EV_TYPE_MAG:
249 case IIO_EV_TYPE_ROC:
250 case IIO_EV_TYPE_THRESH_ADAPTIVE:
251 case IIO_EV_TYPE_MAG_ADAPTIVE:
252 case IIO_EV_TYPE_CHANGE:
253 case IIO_EV_TYPE_GESTURE:
254 case IIO_EV_TYPE_FAULT:
255 break;
256 default:
257 return false;
258 }
259
260 switch (dir) {
261 case IIO_EV_DIR_EITHER:
262 case IIO_EV_DIR_RISING:
263 case IIO_EV_DIR_FALLING:
264 case IIO_EV_DIR_SINGLETAP:
265 case IIO_EV_DIR_DOUBLETAP:
266 case IIO_EV_DIR_FAULT_OPENWIRE:
267 case IIO_EV_DIR_NONE:
268 break;
269 default:
270 return false;
271 }
272
273 return true;
274 }
275
print_event(struct iio_event_data * event)276 static void print_event(struct iio_event_data *event)
277 {
278 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
279 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
280 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
281 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
282 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
283 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
284 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
285
286 if (!event_is_known(event)) {
287 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
288 event->timestamp, event->id);
289
290 return;
291 }
292
293 printf("Event: time: %lld, type: %s", event->timestamp,
294 iio_chan_type_name_spec[type]);
295
296 if (mod != IIO_NO_MOD)
297 printf("(%s)", iio_modifier_names[mod]);
298
299 if (chan >= 0) {
300 printf(", channel: %d", chan);
301 if (diff && chan2 >= 0)
302 printf("-%d", chan2);
303 }
304
305 printf(", evtype: %s", iio_ev_type_text[ev_type]);
306
307 if (dir != IIO_EV_DIR_NONE)
308 printf(", direction: %s", iio_ev_dir_text[dir]);
309
310 printf("\n");
311 fflush(stdout);
312 }
313
314 /* Enable or disable events in sysfs if the knob is available */
enable_events(char * dev_dir,int enable)315 static void enable_events(char *dev_dir, int enable)
316 {
317 const struct dirent *ent;
318 char evdir[256];
319 int ret;
320 DIR *dp;
321
322 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);
323 evdir[sizeof(evdir)-1] = '\0';
324
325 dp = opendir(evdir);
326 if (!dp) {
327 fprintf(stderr, "Enabling/disabling events: can't open %s\n",
328 evdir);
329 return;
330 }
331
332 while (ent = readdir(dp), ent) {
333 if (iioutils_check_suffix(ent->d_name, "_en")) {
334 printf("%sabling: %s\n",
335 enable ? "En" : "Dis",
336 ent->d_name);
337 ret = write_sysfs_int(ent->d_name, evdir,
338 enable);
339 if (ret < 0)
340 fprintf(stderr, "Failed to enable/disable %s\n",
341 ent->d_name);
342 }
343 }
344
345 if (closedir(dp) == -1) {
346 perror("Enabling/disabling channels: "
347 "Failed to close directory");
348 return;
349 }
350 }
351
main(int argc,char ** argv)352 int main(int argc, char **argv)
353 {
354 struct iio_event_data event;
355 const char *device_name;
356 char *dev_dir_name = NULL;
357 char *chrdev_name;
358 int ret;
359 int dev_num;
360 int fd, event_fd;
361 bool all_events = false;
362
363 if (argc == 2) {
364 device_name = argv[1];
365 } else if (argc == 3) {
366 device_name = argv[2];
367 if (!strcmp(argv[1], "-a"))
368 all_events = true;
369 } else {
370 fprintf(stderr,
371 "Usage: iio_event_monitor [options] <device_name>\n"
372 "Listen and display events from IIO devices\n"
373 " -a Auto-activate all available events\n");
374 return -1;
375 }
376
377 dev_num = find_type_by_name(device_name, "iio:device");
378 if (dev_num >= 0) {
379 printf("Found IIO device with name %s with device number %d\n",
380 device_name, dev_num);
381 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
382 if (ret < 0)
383 return -ENOMEM;
384 /* Look up sysfs dir as well if we can */
385 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
386 if (ret < 0)
387 return -ENOMEM;
388 } else {
389 /*
390 * If we can't find an IIO device by name assume device_name is
391 * an IIO chrdev
392 */
393 chrdev_name = strdup(device_name);
394 if (!chrdev_name)
395 return -ENOMEM;
396 }
397
398 if (all_events && dev_dir_name)
399 enable_events(dev_dir_name, 1);
400
401 fd = open(chrdev_name, 0);
402 if (fd == -1) {
403 ret = -errno;
404 fprintf(stderr, "Failed to open %s\n", chrdev_name);
405 goto error_free_chrdev_name;
406 }
407
408 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
409 if (ret == -1 || event_fd == -1) {
410 ret = -errno;
411 if (ret == -ENODEV)
412 fprintf(stderr,
413 "This device does not support events\n");
414 else
415 fprintf(stderr, "Failed to retrieve event fd\n");
416 if (close(fd) == -1)
417 perror("Failed to close character device file");
418
419 goto error_free_chrdev_name;
420 }
421
422 if (close(fd) == -1) {
423 ret = -errno;
424 goto error_free_chrdev_name;
425 }
426
427 while (true) {
428 ret = read(event_fd, &event, sizeof(event));
429 if (ret == -1) {
430 if (errno == EAGAIN) {
431 fprintf(stderr, "nothing available\n");
432 continue;
433 } else {
434 ret = -errno;
435 perror("Failed to read event from device");
436 break;
437 }
438 }
439
440 if (ret != sizeof(event)) {
441 fprintf(stderr, "Reading event failed!\n");
442 ret = -EIO;
443 break;
444 }
445
446 print_event(&event);
447 }
448
449 if (close(event_fd) == -1)
450 perror("Failed to close event file");
451
452 error_free_chrdev_name:
453 /* Disable events after use */
454 if (all_events && dev_dir_name)
455 enable_events(dev_dir_name, 0);
456
457 free(chrdev_name);
458 free(dev_dir_name);
459
460 return ret;
461 }
462