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