1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Industrialio event test code.
4 * Copyright (c) 2011-2012 Lars-Peter Clausen <lars@metafoo.de>
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",
71 [IIO_EV_TYPE_MAG_REFERENCED] = "mag_referenced",
72 [IIO_EV_TYPE_GESTURE] = "gesture",
75 static const char * const iio_ev_dir_text[] = {
76 [IIO_EV_DIR_EITHER] = "either",
77 [IIO_EV_DIR_RISING] = "rising",
78 [IIO_EV_DIR_FALLING] = "falling",
79 [IIO_EV_DIR_SINGLETAP] = "singletap",
80 [IIO_EV_DIR_DOUBLETAP] = "doubletap",
83 static const char * const iio_modifier_names[] = {
87 [IIO_MOD_X_AND_Y] = "x&y",
88 [IIO_MOD_X_AND_Z] = "x&z",
89 [IIO_MOD_Y_AND_Z] = "y&z",
90 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
91 [IIO_MOD_X_OR_Y] = "x|y",
92 [IIO_MOD_X_OR_Z] = "x|z",
93 [IIO_MOD_Y_OR_Z] = "y|z",
94 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
95 [IIO_MOD_LIGHT_BOTH] = "both",
96 [IIO_MOD_LIGHT_IR] = "ir",
97 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
98 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
99 [IIO_MOD_LIGHT_CLEAR] = "clear",
100 [IIO_MOD_LIGHT_RED] = "red",
101 [IIO_MOD_LIGHT_GREEN] = "green",
102 [IIO_MOD_LIGHT_BLUE] = "blue",
103 [IIO_MOD_LIGHT_UV] = "uv",
104 [IIO_MOD_LIGHT_DUV] = "duv",
105 [IIO_MOD_QUATERNION] = "quaternion",
106 [IIO_MOD_TEMP_AMBIENT] = "ambient",
107 [IIO_MOD_TEMP_OBJECT] = "object",
108 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
109 [IIO_MOD_NORTH_TRUE] = "from_north_true",
110 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
111 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
112 [IIO_MOD_RUNNING] = "running",
113 [IIO_MOD_JOGGING] = "jogging",
114 [IIO_MOD_WALKING] = "walking",
115 [IIO_MOD_STILL] = "still",
116 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
119 [IIO_MOD_CO2] = "co2",
120 [IIO_MOD_ETHANOL] = "ethanol",
122 [IIO_MOD_VOC] = "voc",
123 [IIO_MOD_PM1] = "pm1",
124 [IIO_MOD_PM2P5] = "pm2p5",
125 [IIO_MOD_PM4] = "pm4",
126 [IIO_MOD_PM10] = "pm10",
128 [IIO_MOD_LINEAR_X] = "linear_x",
129 [IIO_MOD_LINEAR_Y] = "linear_y",
130 [IIO_MOD_LINEAR_Z] = "linear_z",
131 [IIO_MOD_PITCH] = "pitch",
132 [IIO_MOD_YAW] = "yaw",
133 [IIO_MOD_ROLL] = "roll",
136 static bool event_is_known(struct iio_event_data *event)
138 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
139 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
140 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
141 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
158 case IIO_CAPACITANCE:
162 case IIO_HUMIDITYRELATIVE:
168 case IIO_CONCENTRATION:
173 case IIO_POSITIONRELATIVE:
175 case IIO_MASSCONCENTRATION:
186 case IIO_MOD_X_AND_Y:
187 case IIO_MOD_X_AND_Z:
188 case IIO_MOD_Y_AND_Z:
189 case IIO_MOD_X_AND_Y_AND_Z:
193 case IIO_MOD_X_OR_Y_OR_Z:
194 case IIO_MOD_LIGHT_BOTH:
195 case IIO_MOD_LIGHT_IR:
196 case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
197 case IIO_MOD_SUM_SQUARED_X_Y_Z:
198 case IIO_MOD_LIGHT_CLEAR:
199 case IIO_MOD_LIGHT_RED:
200 case IIO_MOD_LIGHT_GREEN:
201 case IIO_MOD_LIGHT_BLUE:
202 case IIO_MOD_LIGHT_UV:
203 case IIO_MOD_LIGHT_DUV:
204 case IIO_MOD_QUATERNION:
205 case IIO_MOD_TEMP_AMBIENT:
206 case IIO_MOD_TEMP_OBJECT:
207 case IIO_MOD_NORTH_MAGN:
208 case IIO_MOD_NORTH_TRUE:
209 case IIO_MOD_NORTH_MAGN_TILT_COMP:
210 case IIO_MOD_NORTH_TRUE_TILT_COMP:
211 case IIO_MOD_RUNNING:
212 case IIO_MOD_JOGGING:
213 case IIO_MOD_WALKING:
215 case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
219 case IIO_MOD_ETHANOL:
233 case IIO_EV_TYPE_THRESH:
234 case IIO_EV_TYPE_MAG:
235 case IIO_EV_TYPE_ROC:
236 case IIO_EV_TYPE_THRESH_ADAPTIVE:
237 case IIO_EV_TYPE_MAG_ADAPTIVE:
238 case IIO_EV_TYPE_CHANGE:
239 case IIO_EV_TYPE_GESTURE:
246 case IIO_EV_DIR_EITHER:
247 case IIO_EV_DIR_RISING:
248 case IIO_EV_DIR_FALLING:
249 case IIO_EV_DIR_SINGLETAP:
250 case IIO_EV_DIR_DOUBLETAP:
251 case IIO_EV_DIR_NONE:
260 static void print_event(struct iio_event_data *event)
262 enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
263 enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
264 enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
265 enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
266 int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
267 int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
268 bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
270 if (!event_is_known(event)) {
271 fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
272 event->timestamp, event->id);
277 printf("Event: time: %lld, type: %s", event->timestamp,
278 iio_chan_type_name_spec[type]);
280 if (mod != IIO_NO_MOD)
281 printf("(%s)", iio_modifier_names[mod]);
284 printf(", channel: %d", chan);
285 if (diff && chan2 >= 0)
286 printf("-%d", chan2);
289 printf(", evtype: %s", iio_ev_type_text[ev_type]);
291 if (dir != IIO_EV_DIR_NONE)
292 printf(", direction: %s", iio_ev_dir_text[dir]);
298 /* Enable or disable events in sysfs if the knob is available */
299 static void enable_events(char *dev_dir, int enable)
301 const struct dirent *ent;
306 snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);
307 evdir[sizeof(evdir)-1] = '\0';
311 fprintf(stderr, "Enabling/disabling events: can't open %s\n",
316 while (ent = readdir(dp), ent) {
317 if (iioutils_check_suffix(ent->d_name, "_en")) {
318 printf("%sabling: %s\n",
319 enable ? "En" : "Dis",
321 ret = write_sysfs_int(ent->d_name, evdir,
324 fprintf(stderr, "Failed to enable/disable %s\n",
329 if (closedir(dp) == -1) {
330 perror("Enabling/disabling channels: "
331 "Failed to close directory");
336 int main(int argc, char **argv)
338 struct iio_event_data event;
339 const char *device_name;
340 char *dev_dir_name = NULL;
345 bool all_events = false;
348 device_name = argv[1];
349 } else if (argc == 3) {
350 device_name = argv[2];
351 if (!strcmp(argv[1], "-a"))
355 "Usage: iio_event_monitor [options] <device_name>\n"
356 "Listen and display events from IIO devices\n"
357 " -a Auto-activate all available events\n");
361 dev_num = find_type_by_name(device_name, "iio:device");
363 printf("Found IIO device with name %s with device number %d\n",
364 device_name, dev_num);
365 ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
368 /* Look up sysfs dir as well if we can */
369 ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
374 * If we can't find an IIO device by name assume device_name is
377 chrdev_name = strdup(device_name);
382 if (all_events && dev_dir_name)
383 enable_events(dev_dir_name, 1);
385 fd = open(chrdev_name, 0);
388 fprintf(stderr, "Failed to open %s\n", chrdev_name);
389 goto error_free_chrdev_name;
392 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
393 if (ret == -1 || event_fd == -1) {
397 "This device does not support events\n");
399 fprintf(stderr, "Failed to retrieve event fd\n");
401 perror("Failed to close character device file");
403 goto error_free_chrdev_name;
406 if (close(fd) == -1) {
408 goto error_free_chrdev_name;
412 ret = read(event_fd, &event, sizeof(event));
414 if (errno == EAGAIN) {
415 fprintf(stderr, "nothing available\n");
419 perror("Failed to read event from device");
424 if (ret != sizeof(event)) {
425 fprintf(stderr, "Reading event failed!\n");
433 if (close(event_fd) == -1)
434 perror("Failed to close event file");
436 error_free_chrdev_name:
437 /* Disable events after use */
438 if (all_events && dev_dir_name)
439 enable_events(dev_dir_name, 0);