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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};
63
64static const char * const iio_ev_type_text[] = {
65 [IIO_EV_TYPE_THRESH] = "thresh",
66 [IIO_EV_TYPE_MAG] = "mag",
67 [IIO_EV_TYPE_ROC] = "roc",
68 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
69 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
70 [IIO_EV_TYPE_CHANGE] = "change",
71};
72
73static const char * const iio_ev_dir_text[] = {
74 [IIO_EV_DIR_EITHER] = "either",
75 [IIO_EV_DIR_RISING] = "rising",
76 [IIO_EV_DIR_FALLING] = "falling"
77};
78
79static const char * const iio_modifier_names[] = {
80 [IIO_MOD_X] = "x",
81 [IIO_MOD_Y] = "y",
82 [IIO_MOD_Z] = "z",
83 [IIO_MOD_X_AND_Y] = "x&y",
84 [IIO_MOD_X_AND_Z] = "x&z",
85 [IIO_MOD_Y_AND_Z] = "y&z",
86 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
87 [IIO_MOD_X_OR_Y] = "x|y",
88 [IIO_MOD_X_OR_Z] = "x|z",
89 [IIO_MOD_Y_OR_Z] = "y|z",
90 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
91 [IIO_MOD_LIGHT_BOTH] = "both",
92 [IIO_MOD_LIGHT_IR] = "ir",
93 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
94 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
95 [IIO_MOD_LIGHT_CLEAR] = "clear",
96 [IIO_MOD_LIGHT_RED] = "red",
97 [IIO_MOD_LIGHT_GREEN] = "green",
98 [IIO_MOD_LIGHT_BLUE] = "blue",
99 [IIO_MOD_LIGHT_UV] = "uv",
100 [IIO_MOD_LIGHT_DUV] = "duv",
101 [IIO_MOD_QUATERNION] = "quaternion",
102 [IIO_MOD_TEMP_AMBIENT] = "ambient",
103 [IIO_MOD_TEMP_OBJECT] = "object",
104 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
105 [IIO_MOD_NORTH_TRUE] = "from_north_true",
106 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
107 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
108 [IIO_MOD_RUNNING] = "running",
109 [IIO_MOD_JOGGING] = "jogging",
110 [IIO_MOD_WALKING] = "walking",
111 [IIO_MOD_STILL] = "still",
112 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
113 [IIO_MOD_I] = "i",
114 [IIO_MOD_Q] = "q",
115 [IIO_MOD_CO2] = "co2",
116 [IIO_MOD_ETHANOL] = "ethanol",
117 [IIO_MOD_H2] = "h2",
118 [IIO_MOD_VOC] = "voc",
119 [IIO_MOD_PM1] = "pm1",
120 [IIO_MOD_PM2P5] = "pm2p5",
121 [IIO_MOD_PM4] = "pm4",
122 [IIO_MOD_PM10] = "pm10",
123 [IIO_MOD_O2] = "o2",
124};
125
126static bool event_is_known(struct iio_event_data *event)
127{
128 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
129 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
130 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
131 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
132
133 switch (type) {
134 case IIO_VOLTAGE:
135 case IIO_CURRENT:
136 case IIO_POWER:
137 case IIO_ACCEL:
138 case IIO_ANGL_VEL:
139 case IIO_MAGN:
140 case IIO_LIGHT:
141 case IIO_INTENSITY:
142 case IIO_PROXIMITY:
143 case IIO_TEMP:
144 case IIO_INCLI:
145 case IIO_ROT:
146 case IIO_ANGL:
147 case IIO_TIMESTAMP:
148 case IIO_CAPACITANCE:
149 case IIO_ALTVOLTAGE:
150 case IIO_CCT:
151 case IIO_PRESSURE:
152 case IIO_HUMIDITYRELATIVE:
153 case IIO_ACTIVITY:
154 case IIO_STEPS:
155 case IIO_ENERGY:
156 case IIO_DISTANCE:
157 case IIO_VELOCITY:
158 case IIO_CONCENTRATION:
159 case IIO_RESISTANCE:
160 case IIO_PH:
161 case IIO_UVINDEX:
162 case IIO_GRAVITY:
163 case IIO_POSITIONRELATIVE:
164 case IIO_PHASE:
165 case IIO_MASSCONCENTRATION:
166 break;
167 default:
168 return false;
169 }
170
171 switch (mod) {
172 case IIO_NO_MOD:
173 case IIO_MOD_X:
174 case IIO_MOD_Y:
175 case IIO_MOD_Z:
176 case IIO_MOD_X_AND_Y:
177 case IIO_MOD_X_AND_Z:
178 case IIO_MOD_Y_AND_Z:
179 case IIO_MOD_X_AND_Y_AND_Z:
180 case IIO_MOD_X_OR_Y:
181 case IIO_MOD_X_OR_Z:
182 case IIO_MOD_Y_OR_Z:
183 case IIO_MOD_X_OR_Y_OR_Z:
184 case IIO_MOD_LIGHT_BOTH:
185 case IIO_MOD_LIGHT_IR:
186 case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
187 case IIO_MOD_SUM_SQUARED_X_Y_Z:
188 case IIO_MOD_LIGHT_CLEAR:
189 case IIO_MOD_LIGHT_RED:
190 case IIO_MOD_LIGHT_GREEN:
191 case IIO_MOD_LIGHT_BLUE:
192 case IIO_MOD_LIGHT_UV:
193 case IIO_MOD_LIGHT_DUV:
194 case IIO_MOD_QUATERNION:
195 case IIO_MOD_TEMP_AMBIENT:
196 case IIO_MOD_TEMP_OBJECT:
197 case IIO_MOD_NORTH_MAGN:
198 case IIO_MOD_NORTH_TRUE:
199 case IIO_MOD_NORTH_MAGN_TILT_COMP:
200 case IIO_MOD_NORTH_TRUE_TILT_COMP:
201 case IIO_MOD_RUNNING:
202 case IIO_MOD_JOGGING:
203 case IIO_MOD_WALKING:
204 case IIO_MOD_STILL:
205 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
206 case IIO_MOD_I:
207 case IIO_MOD_Q:
208 case IIO_MOD_CO2:
209 case IIO_MOD_ETHANOL:
210 case IIO_MOD_H2:
211 case IIO_MOD_VOC:
212 case IIO_MOD_PM1:
213 case IIO_MOD_PM2P5:
214 case IIO_MOD_PM4:
215 case IIO_MOD_PM10:
216 case IIO_MOD_O2:
217 break;
218 default:
219 return false;
220 }
221
222 switch (ev_type) {
223 case IIO_EV_TYPE_THRESH:
224 case IIO_EV_TYPE_MAG:
225 case IIO_EV_TYPE_ROC:
226 case IIO_EV_TYPE_THRESH_ADAPTIVE:
227 case IIO_EV_TYPE_MAG_ADAPTIVE:
228 case IIO_EV_TYPE_CHANGE:
229 break;
230 default:
231 return false;
232 }
233
234 switch (dir) {
235 case IIO_EV_DIR_EITHER:
236 case IIO_EV_DIR_RISING:
237 case IIO_EV_DIR_FALLING:
238 case IIO_EV_DIR_NONE:
239 break;
240 default:
241 return false;
242 }
243
244 return true;
245}
246
247static void print_event(struct iio_event_data *event)
248{
249 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
250 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
251 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
252 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
253 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
254 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
255 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
256
257 if (!event_is_known(event)) {
258 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
259 event->timestamp, event->id);
260
261 return;
262 }
263
264 printf("Event: time: %lld, type: %s", event->timestamp,
265 iio_chan_type_name_spec[type]);
266
267 if (mod != IIO_NO_MOD)
268 printf("(%s)", iio_modifier_names[mod]);
269
270 if (chan >= 0) {
271 printf(", channel: %d", chan);
272 if (diff && chan2 >= 0)
273 printf("-%d", chan2);
274 }
275
276 printf(", evtype: %s", iio_ev_type_text[ev_type]);
277
278 if (dir != IIO_EV_DIR_NONE)
279 printf(", direction: %s", iio_ev_dir_text[dir]);
280
281 printf("\n");
282}
283
284
285static void enable_events(char *dev_dir, int enable)
286{
287 const struct dirent *ent;
288 char evdir[256];
289 int ret;
290 DIR *dp;
291
292 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);
293 evdir[sizeof(evdir)-1] = '\0';
294
295 dp = opendir(evdir);
296 if (!dp) {
297 fprintf(stderr, "Enabling/disabling events: can't open %s\n",
298 evdir);
299 return;
300 }
301
302 while (ent = readdir(dp), ent) {
303 if (iioutils_check_suffix(ent->d_name, "_en")) {
304 printf("%sabling: %s\n",
305 enable ? "En" : "Dis",
306 ent->d_name);
307 ret = write_sysfs_int(ent->d_name, evdir,
308 enable);
309 if (ret < 0)
310 fprintf(stderr, "Failed to enable/disable %s\n",
311 ent->d_name);
312 }
313 }
314
315 if (closedir(dp) == -1) {
316 perror("Enabling/disabling channels: "
317 "Failed to close directory");
318 return;
319 }
320}
321
322int main(int argc, char **argv)
323{
324 struct iio_event_data event;
325 const char *device_name;
326 char *dev_dir_name = NULL;
327 char *chrdev_name;
328 int ret;
329 int dev_num;
330 int fd, event_fd;
331 bool all_events = false;
332
333 if (argc == 2) {
334 device_name = argv[1];
335 } else if (argc == 3) {
336 device_name = argv[2];
337 if (!strcmp(argv[1], "-a"))
338 all_events = true;
339 } else {
340 fprintf(stderr,
341 "Usage: iio_event_monitor [options] <device_name>\n"
342 "Listen and display events from IIO devices\n"
343 " -a Auto-activate all available events\n");
344 return -1;
345 }
346
347 dev_num = find_type_by_name(device_name, "iio:device");
348 if (dev_num >= 0) {
349 printf("Found IIO device with name %s with device number %d\n",
350 device_name, dev_num);
351 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
352 if (ret < 0)
353 return -ENOMEM;
354
355 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
356 if (ret < 0)
357 return -ENOMEM;
358 } else {
359
360
361
362
363 chrdev_name = strdup(device_name);
364 if (!chrdev_name)
365 return -ENOMEM;
366 }
367
368 if (all_events && dev_dir_name)
369 enable_events(dev_dir_name, 1);
370
371 fd = open(chrdev_name, 0);
372 if (fd == -1) {
373 ret = -errno;
374 fprintf(stderr, "Failed to open %s\n", chrdev_name);
375 goto error_free_chrdev_name;
376 }
377
378 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
379 if (ret == -1 || event_fd == -1) {
380 ret = -errno;
381 if (ret == -ENODEV)
382 fprintf(stderr,
383 "This device does not support events\n");
384 else
385 fprintf(stderr, "Failed to retrieve event fd\n");
386 if (close(fd) == -1)
387 perror("Failed to close character device file");
388
389 goto error_free_chrdev_name;
390 }
391
392 if (close(fd) == -1) {
393 ret = -errno;
394 goto error_free_chrdev_name;
395 }
396
397 while (true) {
398 ret = read(event_fd, &event, sizeof(event));
399 if (ret == -1) {
400 if (errno == EAGAIN) {
401 fprintf(stderr, "nothing available\n");
402 continue;
403 } else {
404 ret = -errno;
405 perror("Failed to read event from device");
406 break;
407 }
408 }
409
410 if (ret != sizeof(event)) {
411 fprintf(stderr, "Reading event failed!\n");
412 ret = -EIO;
413 break;
414 }
415
416 print_event(&event);
417 }
418
419 if (close(event_fd) == -1)
420 perror("Failed to close event file");
421
422error_free_chrdev_name:
423
424 if (all_events && dev_dir_name)
425 enable_events(dev_dir_name, 0);
426
427 free(chrdev_name);
428
429 return ret;
430}
431
