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 <stdbool.h>
18 #include <stdio.h>
19 #include <errno.h>
20 #include <string.h>
21 #include <poll.h>
22 #include <fcntl.h>
23 #include <sys/ioctl.h>
24 #include "iio_utils.h"
25 #include <linux/iio/events.h>
26 #include <linux/iio/types.h>
27
28 static const char * const iio_chan_type_name_spec[] = {
29 [IIO_VOLTAGE] = "voltage",
30 [IIO_CURRENT] = "current",
31 [IIO_POWER] = "power",
32 [IIO_ACCEL] = "accel",
33 [IIO_ANGL_VEL] = "anglvel",
34 [IIO_MAGN] = "magn",
35 [IIO_LIGHT] = "illuminance",
36 [IIO_INTENSITY] = "intensity",
37 [IIO_PROXIMITY] = "proximity",
38 [IIO_TEMP] = "temp",
39 [IIO_INCLI] = "incli",
40 [IIO_ROT] = "rot",
41 [IIO_ANGL] = "angl",
42 [IIO_TIMESTAMP] = "timestamp",
43 [IIO_CAPACITANCE] = "capacitance",
44 [IIO_ALTVOLTAGE] = "altvoltage",
45 [IIO_CCT] = "cct",
46 [IIO_PRESSURE] = "pressure",
47 [IIO_HUMIDITYRELATIVE] = "humidityrelative",
48 [IIO_ACTIVITY] = "activity",
49 [IIO_STEPS] = "steps",
50 [IIO_ENERGY] = "energy",
51 [IIO_DISTANCE] = "distance",
52 [IIO_VELOCITY] = "velocity",
53 [IIO_CONCENTRATION] = "concentration",
54 [IIO_RESISTANCE] = "resistance",
55 [IIO_PH] = "ph",
56 [IIO_UVINDEX] = "uvindex",
57 [IIO_GRAVITY] = "gravity",
58 [IIO_POSITIONRELATIVE] = "positionrelative",
59 [IIO_PHASE] = "phase",
60 [IIO_MASSCONCENTRATION] = "massconcentration",
61 };
62
63 static const char * const iio_ev_type_text[] = {
64 [IIO_EV_TYPE_THRESH] = "thresh",
65 [IIO_EV_TYPE_MAG] = "mag",
66 [IIO_EV_TYPE_ROC] = "roc",
67 [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
68 [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
69 [IIO_EV_TYPE_CHANGE] = "change",
70 };
71
72 static const char * const iio_ev_dir_text[] = {
73 [IIO_EV_DIR_EITHER] = "either",
74 [IIO_EV_DIR_RISING] = "rising",
75 [IIO_EV_DIR_FALLING] = "falling"
76 };
77
78 static const char * const iio_modifier_names[] = {
79 [IIO_MOD_X] = "x",
80 [IIO_MOD_Y] = "y",
81 [IIO_MOD_Z] = "z",
82 [IIO_MOD_X_AND_Y] = "x&y",
83 [IIO_MOD_X_AND_Z] = "x&z",
84 [IIO_MOD_Y_AND_Z] = "y&z",
85 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
86 [IIO_MOD_X_OR_Y] = "x|y",
87 [IIO_MOD_X_OR_Z] = "x|z",
88 [IIO_MOD_Y_OR_Z] = "y|z",
89 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
90 [IIO_MOD_LIGHT_BOTH] = "both",
91 [IIO_MOD_LIGHT_IR] = "ir",
92 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
93 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
94 [IIO_MOD_LIGHT_CLEAR] = "clear",
95 [IIO_MOD_LIGHT_RED] = "red",
96 [IIO_MOD_LIGHT_GREEN] = "green",
97 [IIO_MOD_LIGHT_BLUE] = "blue",
98 [IIO_MOD_LIGHT_UV] = "uv",
99 [IIO_MOD_LIGHT_DUV] = "duv",
100 [IIO_MOD_QUATERNION] = "quaternion",
101 [IIO_MOD_TEMP_AMBIENT] = "ambient",
102 [IIO_MOD_TEMP_OBJECT] = "object",
103 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
104 [IIO_MOD_NORTH_TRUE] = "from_north_true",
105 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
106 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
107 [IIO_MOD_RUNNING] = "running",
108 [IIO_MOD_JOGGING] = "jogging",
109 [IIO_MOD_WALKING] = "walking",
110 [IIO_MOD_STILL] = "still",
111 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
112 [IIO_MOD_I] = "i",
113 [IIO_MOD_Q] = "q",
114 [IIO_MOD_CO2] = "co2",
115 [IIO_MOD_ETHANOL] = "ethanol",
116 [IIO_MOD_H2] = "h2",
117 [IIO_MOD_VOC] = "voc",
118 [IIO_MOD_PM1] = "pm1",
119 [IIO_MOD_PM2P5] = "pm2p5",
120 [IIO_MOD_PM4] = "pm4",
121 [IIO_MOD_PM10] = "pm10",
122 [IIO_MOD_O2] = "o2",
123 };
124
event_is_known(struct iio_event_data * event)125 static bool event_is_known(struct iio_event_data *event)
126 {
127 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
128 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
129 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
130 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
131
132 switch (type) {
133 case IIO_VOLTAGE:
134 case IIO_CURRENT:
135 case IIO_POWER:
136 case IIO_ACCEL:
137 case IIO_ANGL_VEL:
138 case IIO_MAGN:
139 case IIO_LIGHT:
140 case IIO_INTENSITY:
141 case IIO_PROXIMITY:
142 case IIO_TEMP:
143 case IIO_INCLI:
144 case IIO_ROT:
145 case IIO_ANGL:
146 case IIO_TIMESTAMP:
147 case IIO_CAPACITANCE:
148 case IIO_ALTVOLTAGE:
149 case IIO_CCT:
150 case IIO_PRESSURE:
151 case IIO_HUMIDITYRELATIVE:
152 case IIO_ACTIVITY:
153 case IIO_STEPS:
154 case IIO_ENERGY:
155 case IIO_DISTANCE:
156 case IIO_VELOCITY:
157 case IIO_CONCENTRATION:
158 case IIO_RESISTANCE:
159 case IIO_PH:
160 case IIO_UVINDEX:
161 case IIO_GRAVITY:
162 case IIO_POSITIONRELATIVE:
163 case IIO_PHASE:
164 case IIO_MASSCONCENTRATION:
165 break;
166 default:
167 return false;
168 }
169
170 switch (mod) {
171 case IIO_NO_MOD:
172 case IIO_MOD_X:
173 case IIO_MOD_Y:
174 case IIO_MOD_Z:
175 case IIO_MOD_X_AND_Y:
176 case IIO_MOD_X_AND_Z:
177 case IIO_MOD_Y_AND_Z:
178 case IIO_MOD_X_AND_Y_AND_Z:
179 case IIO_MOD_X_OR_Y:
180 case IIO_MOD_X_OR_Z:
181 case IIO_MOD_Y_OR_Z:
182 case IIO_MOD_X_OR_Y_OR_Z:
183 case IIO_MOD_LIGHT_BOTH:
184 case IIO_MOD_LIGHT_IR:
185 case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
186 case IIO_MOD_SUM_SQUARED_X_Y_Z:
187 case IIO_MOD_LIGHT_CLEAR:
188 case IIO_MOD_LIGHT_RED:
189 case IIO_MOD_LIGHT_GREEN:
190 case IIO_MOD_LIGHT_BLUE:
191 case IIO_MOD_LIGHT_UV:
192 case IIO_MOD_LIGHT_DUV:
193 case IIO_MOD_QUATERNION:
194 case IIO_MOD_TEMP_AMBIENT:
195 case IIO_MOD_TEMP_OBJECT:
196 case IIO_MOD_NORTH_MAGN:
197 case IIO_MOD_NORTH_TRUE:
198 case IIO_MOD_NORTH_MAGN_TILT_COMP:
199 case IIO_MOD_NORTH_TRUE_TILT_COMP:
200 case IIO_MOD_RUNNING:
201 case IIO_MOD_JOGGING:
202 case IIO_MOD_WALKING:
203 case IIO_MOD_STILL:
204 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
205 case IIO_MOD_I:
206 case IIO_MOD_Q:
207 case IIO_MOD_CO2:
208 case IIO_MOD_ETHANOL:
209 case IIO_MOD_H2:
210 case IIO_MOD_VOC:
211 case IIO_MOD_PM1:
212 case IIO_MOD_PM2P5:
213 case IIO_MOD_PM4:
214 case IIO_MOD_PM10:
215 case IIO_MOD_O2:
216 break;
217 default:
218 return false;
219 }
220
221 switch (ev_type) {
222 case IIO_EV_TYPE_THRESH:
223 case IIO_EV_TYPE_MAG:
224 case IIO_EV_TYPE_ROC:
225 case IIO_EV_TYPE_THRESH_ADAPTIVE:
226 case IIO_EV_TYPE_MAG_ADAPTIVE:
227 case IIO_EV_TYPE_CHANGE:
228 break;
229 default:
230 return false;
231 }
232
233 switch (dir) {
234 case IIO_EV_DIR_EITHER:
235 case IIO_EV_DIR_RISING:
236 case IIO_EV_DIR_FALLING:
237 case IIO_EV_DIR_NONE:
238 break;
239 default:
240 return false;
241 }
242
243 return true;
244 }
245
print_event(struct iio_event_data * event)246 static void print_event(struct iio_event_data *event)
247 {
248 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
249 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
250 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
251 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
252 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
253 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
254 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
255
256 if (!event_is_known(event)) {
257 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
258 event->timestamp, event->id);
259
260 return;
261 }
262
263 printf("Event: time: %lld, type: %s", event->timestamp,
264 iio_chan_type_name_spec[type]);
265
266 if (mod != IIO_NO_MOD)
267 printf("(%s)", iio_modifier_names[mod]);
268
269 if (chan >= 0) {
270 printf(", channel: %d", chan);
271 if (diff && chan2 >= 0)
272 printf("-%d", chan2);
273 }
274
275 printf(", evtype: %s", iio_ev_type_text[ev_type]);
276
277 if (dir != IIO_EV_DIR_NONE)
278 printf(", direction: %s", iio_ev_dir_text[dir]);
279
280 printf("\n");
281 }
282
main(int argc,char ** argv)283 int main(int argc, char **argv)
284 {
285 struct iio_event_data event;
286 const char *device_name;
287 char *chrdev_name;
288 int ret;
289 int dev_num;
290 int fd, event_fd;
291
292 if (argc <= 1) {
293 fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
294 return -1;
295 }
296
297 device_name = argv[1];
298
299 dev_num = find_type_by_name(device_name, "iio:device");
300 if (dev_num >= 0) {
301 printf("Found IIO device with name %s with device number %d\n",
302 device_name, dev_num);
303 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
304 if (ret < 0)
305 return -ENOMEM;
306 } else {
307 /*
308 * If we can't find an IIO device by name assume device_name is
309 * an IIO chrdev
310 */
311 chrdev_name = strdup(device_name);
312 if (!chrdev_name)
313 return -ENOMEM;
314 }
315
316 fd = open(chrdev_name, 0);
317 if (fd == -1) {
318 ret = -errno;
319 fprintf(stderr, "Failed to open %s\n", chrdev_name);
320 goto error_free_chrdev_name;
321 }
322
323 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
324 if (ret == -1 || event_fd == -1) {
325 ret = -errno;
326 if (ret == -ENODEV)
327 fprintf(stderr,
328 "This device does not support events\n");
329 else
330 fprintf(stderr, "Failed to retrieve event fd\n");
331 if (close(fd) == -1)
332 perror("Failed to close character device file");
333
334 goto error_free_chrdev_name;
335 }
336
337 if (close(fd) == -1) {
338 ret = -errno;
339 goto error_free_chrdev_name;
340 }
341
342 while (true) {
343 ret = read(event_fd, &event, sizeof(event));
344 if (ret == -1) {
345 if (errno == EAGAIN) {
346 fprintf(stderr, "nothing available\n");
347 continue;
348 } else {
349 ret = -errno;
350 perror("Failed to read event from device");
351 break;
352 }
353 }
354
355 if (ret != sizeof(event)) {
356 fprintf(stderr, "Reading event failed!\n");
357 ret = -EIO;
358 break;
359 }
360
361 print_event(&event);
362 }
363
364 if (close(event_fd) == -1)
365 perror("Failed to close event file");
366
367 error_free_chrdev_name:
368 free(chrdev_name);
369
370 return ret;
371 }
372