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
29static 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
68static 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
79static 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
87static 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_DUV] = "duv",
109 [IIO_MOD_QUATERNION] = "quaternion",
110 [IIO_MOD_TEMP_AMBIENT] = "ambient",
111 [IIO_MOD_TEMP_OBJECT] = "object",
112 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
113 [IIO_MOD_NORTH_TRUE] = "from_north_true",
114 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
115 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
116 [IIO_MOD_RUNNING] = "running",
117 [IIO_MOD_JOGGING] = "jogging",
118 [IIO_MOD_WALKING] = "walking",
119 [IIO_MOD_STILL] = "still",
120 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
121 [IIO_MOD_I] = "i",
122 [IIO_MOD_Q] = "q",
123 [IIO_MOD_CO2] = "co2",
124 [IIO_MOD_ETHANOL] = "ethanol",
125 [IIO_MOD_H2] = "h2",
126 [IIO_MOD_VOC] = "voc",
127 [IIO_MOD_PM1] = "pm1",
128 [IIO_MOD_PM2P5] = "pm2p5",
129 [IIO_MOD_PM4] = "pm4",
130 [IIO_MOD_PM10] = "pm10",
131 [IIO_MOD_O2] = "o2",
132 [IIO_MOD_LINEAR_X] = "linear_x",
133 [IIO_MOD_LINEAR_Y] = "linear_y",
134 [IIO_MOD_LINEAR_Z] = "linear_z",
135 [IIO_MOD_PITCH] = "pitch",
136 [IIO_MOD_YAW] = "yaw",
137 [IIO_MOD_ROLL] = "roll",
138};
139
140static bool event_is_known(struct iio_event_data *event)
141{
142 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
143 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
144 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
145 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
146
147 switch (type) {
148 case IIO_VOLTAGE:
149 case IIO_CURRENT:
150 case IIO_POWER:
151 case IIO_ACCEL:
152 case IIO_ANGL_VEL:
153 case IIO_MAGN:
154 case IIO_LIGHT:
155 case IIO_INTENSITY:
156 case IIO_PROXIMITY:
157 case IIO_TEMP:
158 case IIO_INCLI:
159 case IIO_ROT:
160 case IIO_ANGL:
161 case IIO_TIMESTAMP:
162 case IIO_CAPACITANCE:
163 case IIO_ALTVOLTAGE:
164 case IIO_CCT:
165 case IIO_PRESSURE:
166 case IIO_HUMIDITYRELATIVE:
167 case IIO_ACTIVITY:
168 case IIO_STEPS:
169 case IIO_ENERGY:
170 case IIO_DISTANCE:
171 case IIO_VELOCITY:
172 case IIO_CONCENTRATION:
173 case IIO_RESISTANCE:
174 case IIO_PH:
175 case IIO_UVINDEX:
176 case IIO_GRAVITY:
177 case IIO_POSITIONRELATIVE:
178 case IIO_PHASE:
179 case IIO_MASSCONCENTRATION:
180 case IIO_DELTA_ANGL:
181 case IIO_DELTA_VELOCITY:
182 case IIO_COLORTEMP:
183 case IIO_CHROMATICITY:
184 break;
185 default:
186 return false;
187 }
188
189 switch (mod) {
190 case IIO_NO_MOD:
191 case IIO_MOD_X:
192 case IIO_MOD_Y:
193 case IIO_MOD_Z:
194 case IIO_MOD_X_AND_Y:
195 case IIO_MOD_X_AND_Z:
196 case IIO_MOD_Y_AND_Z:
197 case IIO_MOD_X_AND_Y_AND_Z:
198 case IIO_MOD_X_OR_Y:
199 case IIO_MOD_X_OR_Z:
200 case IIO_MOD_Y_OR_Z:
201 case IIO_MOD_X_OR_Y_OR_Z:
202 case IIO_MOD_LIGHT_BOTH:
203 case IIO_MOD_LIGHT_IR:
204 case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
205 case IIO_MOD_SUM_SQUARED_X_Y_Z:
206 case IIO_MOD_LIGHT_CLEAR:
207 case IIO_MOD_LIGHT_RED:
208 case IIO_MOD_LIGHT_GREEN:
209 case IIO_MOD_LIGHT_BLUE:
210 case IIO_MOD_LIGHT_UV:
211 case IIO_MOD_LIGHT_DUV:
212 case IIO_MOD_QUATERNION:
213 case IIO_MOD_TEMP_AMBIENT:
214 case IIO_MOD_TEMP_OBJECT:
215 case IIO_MOD_NORTH_MAGN:
216 case IIO_MOD_NORTH_TRUE:
217 case IIO_MOD_NORTH_MAGN_TILT_COMP:
218 case IIO_MOD_NORTH_TRUE_TILT_COMP:
219 case IIO_MOD_RUNNING:
220 case IIO_MOD_JOGGING:
221 case IIO_MOD_WALKING:
222 case IIO_MOD_STILL:
223 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
224 case IIO_MOD_I:
225 case IIO_MOD_Q:
226 case IIO_MOD_CO2:
227 case IIO_MOD_ETHANOL:
228 case IIO_MOD_H2:
229 case IIO_MOD_VOC:
230 case IIO_MOD_PM1:
231 case IIO_MOD_PM2P5:
232 case IIO_MOD_PM4:
233 case IIO_MOD_PM10:
234 case IIO_MOD_O2:
235 break;
236 default:
237 return false;
238 }
239
240 switch (ev_type) {
241 case IIO_EV_TYPE_THRESH:
242 case IIO_EV_TYPE_MAG:
243 case IIO_EV_TYPE_ROC:
244 case IIO_EV_TYPE_THRESH_ADAPTIVE:
245 case IIO_EV_TYPE_MAG_ADAPTIVE:
246 case IIO_EV_TYPE_CHANGE:
247 case IIO_EV_TYPE_GESTURE:
248 break;
249 default:
250 return false;
251 }
252
253 switch (dir) {
254 case IIO_EV_DIR_EITHER:
255 case IIO_EV_DIR_RISING:
256 case IIO_EV_DIR_FALLING:
257 case IIO_EV_DIR_SINGLETAP:
258 case IIO_EV_DIR_DOUBLETAP:
259 case IIO_EV_DIR_NONE:
260 break;
261 default:
262 return false;
263 }
264
265 return true;
266}
267
268static void print_event(struct iio_event_data *event)
269{
270 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
271 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
272 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
273 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
274 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
275 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
276 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
277
278 if (!event_is_known(event)) {
279 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
280 event->timestamp, event->id);
281
282 return;
283 }
284
285 printf("Event: time: %lld, type: %s", event->timestamp,
286 iio_chan_type_name_spec[type]);
287
288 if (mod != IIO_NO_MOD)
289 printf("(%s)", iio_modifier_names[mod]);
290
291 if (chan >= 0) {
292 printf(", channel: %d", chan);
293 if (diff && chan2 >= 0)
294 printf("-%d", chan2);
295 }
296
297 printf(", evtype: %s", iio_ev_type_text[ev_type]);
298
299 if (dir != IIO_EV_DIR_NONE)
300 printf(", direction: %s", iio_ev_dir_text[dir]);
301
302 printf("\n");
303 fflush(stdout);
304}
305
306/* Enable or disable events in sysfs if the knob is available */
307static void enable_events(char *dev_dir, int enable)
308{
309 const struct dirent *ent;
310 char evdir[256];
311 int ret;
312 DIR *dp;
313
314 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);
315 evdir[sizeof(evdir)-1] = '\0';
316
317 dp = opendir(evdir);
318 if (!dp) {
319 fprintf(stderr, "Enabling/disabling events: can't open %s\n",
320 evdir);
321 return;
322 }
323
324 while (ent = readdir(dp), ent) {
325 if (iioutils_check_suffix(str: ent->d_name, suffix: "_en")) {
326 printf("%sabling: %s\n",
327 enable ? "En" : "Dis",
328 ent->d_name);
329 ret = write_sysfs_int(filename: ent->d_name, basedir: evdir,
330 val: enable);
331 if (ret < 0)
332 fprintf(stderr, "Failed to enable/disable %s\n",
333 ent->d_name);
334 }
335 }
336
337 if (closedir(dp) == -1) {
338 perror("Enabling/disabling channels: "
339 "Failed to close directory");
340 return;
341 }
342}
343
344int main(int argc, char **argv)
345{
346 struct iio_event_data event;
347 const char *device_name;
348 char *dev_dir_name = NULL;
349 char *chrdev_name;
350 int ret;
351 int dev_num;
352 int fd, event_fd;
353 bool all_events = false;
354
355 if (argc == 2) {
356 device_name = argv[1];
357 } else if (argc == 3) {
358 device_name = argv[2];
359 if (!strcmp(argv[1], "-a"))
360 all_events = true;
361 } else {
362 fprintf(stderr,
363 "Usage: iio_event_monitor [options] <device_name>\n"
364 "Listen and display events from IIO devices\n"
365 " -a Auto-activate all available events\n");
366 return -1;
367 }
368
369 dev_num = find_type_by_name(name: device_name, type: "iio:device");
370 if (dev_num >= 0) {
371 printf("Found IIO device with name %s with device number %d\n",
372 device_name, dev_num);
373 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
374 if (ret < 0)
375 return -ENOMEM;
376 /* Look up sysfs dir as well if we can */
377 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
378 if (ret < 0)
379 return -ENOMEM;
380 } else {
381 /*
382 * If we can't find an IIO device by name assume device_name is
383 * an IIO chrdev
384 */
385 chrdev_name = strdup(device_name);
386 if (!chrdev_name)
387 return -ENOMEM;
388 }
389
390 if (all_events && dev_dir_name)
391 enable_events(dev_dir: dev_dir_name, enable: 1);
392
393 fd = open(chrdev_name, 0);
394 if (fd == -1) {
395 ret = -errno;
396 fprintf(stderr, "Failed to open %s\n", chrdev_name);
397 goto error_free_chrdev_name;
398 }
399
400 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
401 if (ret == -1 || event_fd == -1) {
402 ret = -errno;
403 if (ret == -ENODEV)
404 fprintf(stderr,
405 "This device does not support events\n");
406 else
407 fprintf(stderr, "Failed to retrieve event fd\n");
408 if (close(fd) == -1)
409 perror("Failed to close character device file");
410
411 goto error_free_chrdev_name;
412 }
413
414 if (close(fd) == -1) {
415 ret = -errno;
416 goto error_free_chrdev_name;
417 }
418
419 while (true) {
420 ret = read(event_fd, &event, sizeof(event));
421 if (ret == -1) {
422 if (errno == EAGAIN) {
423 fprintf(stderr, "nothing available\n");
424 continue;
425 } else {
426 ret = -errno;
427 perror("Failed to read event from device");
428 break;
429 }
430 }
431
432 if (ret != sizeof(event)) {
433 fprintf(stderr, "Reading event failed!\n");
434 ret = -EIO;
435 break;
436 }
437
438 print_event(event: &event);
439 }
440
441 if (close(event_fd) == -1)
442 perror("Failed to close event file");
443
444error_free_chrdev_name:
445 /* Disable events after use */
446 if (all_events && dev_dir_name)
447 enable_events(dev_dir: dev_dir_name, enable: 0);
448
449 free(chrdev_name);
450
451 return ret;
452}
453

source code of linux/tools/iio/iio_event_monitor.c