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