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