1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Industrialio event test code.
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
12 * iio_event_monitor <device_name>
24 #include <sys/ioctl.h>
25 #include "iio_utils.h"
26 #include <linux/iio/events.h>
27 #include <linux/iio/types.h>
29 static 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",
36 [IIO_LIGHT] = "illuminance",
37 [IIO_INTENSITY] = "intensity",
38 [IIO_PROXIMITY] = "proximity",
40 [IIO_INCLI] = "incli",
43 [IIO_TIMESTAMP] = "timestamp",
44 [IIO_CAPACITANCE] = "capacitance",
45 [IIO_ALTVOLTAGE] = "altvoltage",
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",
57 [IIO_UVINDEX] = "uvindex",
58 [IIO_GRAVITY] = "gravity",
59 [IIO_POSITIONRELATIVE] = "positionrelative",
60 [IIO_PHASE] = "phase",
61 [IIO_MASSCONCENTRATION] = "massconcentration",
64 static 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",
73 static 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"
79 static const char * const iio_modifier_names[] = {
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)",
115 [IIO_MOD_CO2] = "co2",
116 [IIO_MOD_ETHANOL] = "ethanol",
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",
126 static bool event_is_known(struct iio_event_data *event)
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);
148 case IIO_CAPACITANCE:
152 case IIO_HUMIDITYRELATIVE:
158 case IIO_CONCENTRATION:
163 case IIO_POSITIONRELATIVE:
165 case IIO_MASSCONCENTRATION:
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:
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:
205 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
209 case IIO_MOD_ETHANOL:
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:
235 case IIO_EV_DIR_EITHER:
236 case IIO_EV_DIR_RISING:
237 case IIO_EV_DIR_FALLING:
238 case IIO_EV_DIR_NONE:
247 static void print_event(struct iio_event_data *event)
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);
257 if (!event_is_known(event)) {
258 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
259 event->timestamp, event->id);
264 printf("Event: time: %lld, type: %s", event->timestamp,
265 iio_chan_type_name_spec[type]);
267 if (mod != IIO_NO_MOD)
268 printf("(%s)", iio_modifier_names[mod]);
271 printf(", channel: %d", chan);
272 if (diff && chan2 >= 0)
273 printf("-%d", chan2);
276 printf(", evtype: %s", iio_ev_type_text[ev_type]);
278 if (dir != IIO_EV_DIR_NONE)
279 printf(", direction: %s", iio_ev_dir_text[dir]);
284 /* Enable or disable events in sysfs if the knob is available */
285 static void enable_events(char *dev_dir, int enable)
287 const struct dirent *ent;
292 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);
293 evdir[sizeof(evdir)-1] = '\0';
297 fprintf(stderr, "Enabling/disabling events: can't open %s\n",
302 while (ent = readdir(dp), ent) {
303 if (iioutils_check_suffix(ent->d_name, "_en")) {
304 printf("%sabling: %s\n",
305 enable ? "En" : "Dis",
307 ret = write_sysfs_int(ent->d_name, evdir,
310 fprintf(stderr, "Failed to enable/disable %s\n",
315 if (closedir(dp) == -1) {
316 perror("Enabling/disabling channels: "
317 "Failed to close directory");
322 int main(int argc, char **argv)
324 struct iio_event_data event;
325 const char *device_name;
326 char *dev_dir_name = NULL;
331 bool all_events = false;
334 device_name = argv[1];
335 } else if (argc == 3) {
336 device_name = argv[2];
337 if (!strcmp(argv[1], "-a"))
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");
347 dev_num = find_type_by_name(device_name, "iio:device");
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);
354 /* Look up sysfs dir as well if we can */
355 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
360 * If we can't find an IIO device by name assume device_name is
363 chrdev_name = strdup(device_name);
368 if (all_events && dev_dir_name)
369 enable_events(dev_dir_name, 1);
371 fd = open(chrdev_name, 0);
374 fprintf(stderr, "Failed to open %s\n", chrdev_name);
375 goto error_free_chrdev_name;
378 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
379 if (ret == -1 || event_fd == -1) {
383 "This device does not support events\n");
385 fprintf(stderr, "Failed to retrieve event fd\n");
387 perror("Failed to close character device file");
389 goto error_free_chrdev_name;
392 if (close(fd) == -1) {
394 goto error_free_chrdev_name;
398 ret = read(event_fd, &event, sizeof(event));
400 if (errno == EAGAIN) {
401 fprintf(stderr, "nothing available\n");
405 perror("Failed to read event from device");
410 if (ret != sizeof(event)) {
411 fprintf(stderr, "Reading event failed!\n");
419 if (close(event_fd) == -1)
420 perror("Failed to close event file");
422 error_free_chrdev_name:
423 /* Disable events after use */
424 if (all_events && dev_dir_name)
425 enable_events(dev_dir_name, 0);