// SPDX-License-Identifier: GPL-2.0-only
/* Industrialio event test code.
*
* Copyright (c) 2011-2012 Lars-Peter Clausen <[email protected]>
*
* This program is primarily intended as an example application.
* Reads the current buffer setup from sysfs and starts a short capture
* from the specified device, pretty printing the result after appropriate
* conversion.
*
* Usage:
* iio_event_monitor <device_name>
*/
#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <poll.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "iio_utils.h"
#include <linux/iio/events.h>
#include <linux/iio/types.h>
static const char * const iio_chan_type_name_spec[] = {
[IIO_VOLTAGE] = "voltage",
[IIO_CURRENT] = "current",
[IIO_POWER] = "power",
[IIO_ACCEL] = "accel",
[IIO_ANGL_VEL] = "anglvel",
[IIO_MAGN] = "magn",
[IIO_LIGHT] = "illuminance",
[IIO_INTENSITY] = "intensity",
[IIO_PROXIMITY] = "proximity",
[IIO_TEMP] = "temp",
[IIO_INCLI] = "incli",
[IIO_ROT] = "rot",
[IIO_ANGL] = "angl",
[IIO_TIMESTAMP] = "timestamp",
[IIO_CAPACITANCE] = "capacitance",
[IIO_ALTVOLTAGE] = "altvoltage",
[IIO_CCT] = "cct",
[IIO_PRESSURE] = "pressure",
[IIO_HUMIDITYRELATIVE] = "humidityrelative",
[IIO_ACTIVITY] = "activity",
[IIO_STEPS] = "steps",
[IIO_ENERGY] = "energy",
[IIO_DISTANCE] = "distance",
[IIO_VELOCITY] = "velocity",
[IIO_CONCENTRATION] = "concentration",
[IIO_RESISTANCE] = "resistance",
[IIO_PH] = "ph",
[IIO_UVINDEX] = "uvindex",
[IIO_GRAVITY] = "gravity",
[IIO_POSITIONRELATIVE] = "positionrelative",
[IIO_PHASE] = "phase",
[IIO_MASSCONCENTRATION] = "massconcentration",
[IIO_DELTA_ANGL] = "deltaangl",
[IIO_DELTA_VELOCITY] = "deltavelocity",
[IIO_COLORTEMP] = "colortemp",
[IIO_CHROMATICITY] = "chromaticity",
};
static const char * const iio_ev_type_text[] = {
[IIO_EV_TYPE_THRESH] = "thresh",
[IIO_EV_TYPE_MAG] = "mag",
[IIO_EV_TYPE_ROC] = "roc",
[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
[IIO_EV_TYPE_CHANGE] = "change",
[IIO_EV_TYPE_MAG_REFERENCED] = "mag_referenced",
[IIO_EV_TYPE_GESTURE] = "gesture",
};
static const char * const iio_ev_dir_text[] = {
[IIO_EV_DIR_EITHER] = "either",
[IIO_EV_DIR_RISING] = "rising",
[IIO_EV_DIR_FALLING] = "falling",
[IIO_EV_DIR_SINGLETAP] = "singletap",
[IIO_EV_DIR_DOUBLETAP] = "doubletap",
};
static const char * const iio_modifier_names[] = {
[IIO_MOD_X] = "x",
[IIO_MOD_Y] = "y",
[IIO_MOD_Z] = "z",
[IIO_MOD_X_AND_Y] = "x&y",
[IIO_MOD_X_AND_Z] = "x&z",
[IIO_MOD_Y_AND_Z] = "y&z",
[IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
[IIO_MOD_X_OR_Y] = "x|y",
[IIO_MOD_X_OR_Z] = "x|z",
[IIO_MOD_Y_OR_Z] = "y|z",
[IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
[IIO_MOD_LIGHT_BOTH] = "both",
[IIO_MOD_LIGHT_IR] = "ir",
[IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
[IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
[IIO_MOD_LIGHT_CLEAR] = "clear",
[IIO_MOD_LIGHT_RED] = "red",
[IIO_MOD_LIGHT_GREEN] = "green",
[IIO_MOD_LIGHT_BLUE] = "blue",
[IIO_MOD_LIGHT_UV] = "uv",
[IIO_MOD_LIGHT_UVA] = "uva",
[IIO_MOD_LIGHT_UVB] = "uvb",
[IIO_MOD_LIGHT_DUV] = "duv",
[IIO_MOD_QUATERNION] = "quaternion",
[IIO_MOD_TEMP_AMBIENT] = "ambient",
[IIO_MOD_TEMP_OBJECT] = "object",
[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
[IIO_MOD_NORTH_TRUE] = "from_north_true",
[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
[IIO_MOD_RUNNING] = "running",
[IIO_MOD_JOGGING] = "jogging",
[IIO_MOD_WALKING] = "walking",
[IIO_MOD_STILL] = "still",
[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
[IIO_MOD_I] = "i",
[IIO_MOD_Q] = "q",
[IIO_MOD_CO2] = "co2",
[IIO_MOD_ETHANOL] = "ethanol",
[IIO_MOD_H2] = "h2",
[IIO_MOD_VOC] = "voc",
[IIO_MOD_PM1] = "pm1",
[IIO_MOD_PM2P5] = "pm2p5",
[IIO_MOD_PM4] = "pm4",
[IIO_MOD_PM10] = "pm10",
[IIO_MOD_O2] = "o2",
[IIO_MOD_LINEAR_X] = "linear_x",
[IIO_MOD_LINEAR_Y] = "linear_y",
[IIO_MOD_LINEAR_Z] = "linear_z",
[IIO_MOD_PITCH] = "pitch",
[IIO_MOD_YAW] = "yaw",
[IIO_MOD_ROLL] = "roll",
};
static bool event_is_known(struct iio_event_data *event)
{
enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
switch (type) {
case IIO_VOLTAGE:
case IIO_CURRENT:
case IIO_POWER:
case IIO_ACCEL:
case IIO_ANGL_VEL:
case IIO_MAGN:
case IIO_LIGHT:
case IIO_INTENSITY:
case IIO_PROXIMITY:
case IIO_TEMP:
case IIO_INCLI:
case IIO_ROT:
case IIO_ANGL:
case IIO_TIMESTAMP:
case IIO_CAPACITANCE:
case IIO_ALTVOLTAGE:
case IIO_CCT:
case IIO_PRESSURE:
case IIO_HUMIDITYRELATIVE:
case IIO_ACTIVITY:
case IIO_STEPS:
case IIO_ENERGY:
case IIO_DISTANCE:
case IIO_VELOCITY:
case IIO_CONCENTRATION:
case IIO_RESISTANCE:
case IIO_PH:
case IIO_UVINDEX:
case IIO_GRAVITY:
case IIO_POSITIONRELATIVE:
case IIO_PHASE:
case IIO_MASSCONCENTRATION:
case IIO_DELTA_ANGL:
case IIO_DELTA_VELOCITY:
case IIO_COLORTEMP:
case IIO_CHROMATICITY:
break;
default:
return false;
}
switch (mod) {
case IIO_NO_MOD:
case IIO_MOD_X:
case IIO_MOD_Y:
case IIO_MOD_Z:
case IIO_MOD_X_AND_Y:
case IIO_MOD_X_AND_Z:
case IIO_MOD_Y_AND_Z:
case IIO_MOD_X_AND_Y_AND_Z:
case IIO_MOD_X_OR_Y:
case IIO_MOD_X_OR_Z:
case IIO_MOD_Y_OR_Z:
case IIO_MOD_X_OR_Y_OR_Z:
case IIO_MOD_LIGHT_BOTH:
case IIO_MOD_LIGHT_IR:
case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
case IIO_MOD_SUM_SQUARED_X_Y_Z:
case IIO_MOD_LIGHT_CLEAR:
case IIO_MOD_LIGHT_RED:
case IIO_MOD_LIGHT_GREEN:
case IIO_MOD_LIGHT_BLUE:
case IIO_MOD_LIGHT_UV:
case IIO_MOD_LIGHT_DUV:
case IIO_MOD_QUATERNION:
case IIO_MOD_TEMP_AMBIENT:
case IIO_MOD_TEMP_OBJECT:
case IIO_MOD_NORTH_MAGN:
case IIO_MOD_NORTH_TRUE:
case IIO_MOD_NORTH_MAGN_TILT_COMP:
case IIO_MOD_NORTH_TRUE_TILT_COMP:
case IIO_MOD_RUNNING:
case IIO_MOD_JOGGING:
case IIO_MOD_WALKING:
case IIO_MOD_STILL:
case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
case IIO_MOD_I:
case IIO_MOD_Q:
case IIO_MOD_CO2:
case IIO_MOD_ETHANOL:
case IIO_MOD_H2:
case IIO_MOD_VOC:
case IIO_MOD_PM1:
case IIO_MOD_PM2P5:
case IIO_MOD_PM4:
case IIO_MOD_PM10:
case IIO_MOD_O2:
break;
default:
return false;
}
switch (ev_type) {
case IIO_EV_TYPE_THRESH:
case IIO_EV_TYPE_MAG:
case IIO_EV_TYPE_ROC:
case IIO_EV_TYPE_THRESH_ADAPTIVE:
case IIO_EV_TYPE_MAG_ADAPTIVE:
case IIO_EV_TYPE_CHANGE:
case IIO_EV_TYPE_GESTURE:
break;
default:
return false;
}
switch (dir) {
case IIO_EV_DIR_EITHER:
case IIO_EV_DIR_RISING:
case IIO_EV_DIR_FALLING:
case IIO_EV_DIR_SINGLETAP:
case IIO_EV_DIR_DOUBLETAP:
case IIO_EV_DIR_NONE:
break;
default:
return false;
}
return true;
}
static void print_event(struct iio_event_data *event)
{
enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
if (!event_is_known(event)) {
fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
event->timestamp, event->id);
return;
}
printf("Event: time: %lld, type: %s", event->timestamp,
iio_chan_type_name_spec[type]);
if (mod != IIO_NO_MOD)
printf("(%s)", iio_modifier_names[mod]);
if (chan >= 0) {
printf(", channel: %d", chan);
if (diff && chan2 >= 0)
printf("-%d", chan2);
}
printf(", evtype: %s", iio_ev_type_text[ev_type]);
if (dir != IIO_EV_DIR_NONE)
printf(", direction: %s", iio_ev_dir_text[dir]);
printf("\n");
fflush(stdout);
}
/* Enable or disable events in sysfs if the knob is available */
static void enable_events(char *dev_dir, int enable)
{
const struct dirent *ent;
char evdir[256];
int ret;
DIR *dp;
snprintf(evdir, sizeof(evdir), FORMAT_EVENTS_DIR, dev_dir);
evdir[sizeof(evdir)-1] = '\0';
dp = opendir(evdir);
if (!dp) {
fprintf(stderr, "Enabling/disabling events: can't open %s\n",
evdir);
return;
}
while (ent = readdir(dp), ent) {
if (iioutils_check_suffix(ent->d_name, "_en")) {
printf("%sabling: %s\n",
enable ? "En" : "Dis",
ent->d_name);
ret = write_sysfs_int(ent->d_name, evdir,
enable);
if (ret < 0)
fprintf(stderr, "Failed to enable/disable %s\n",
ent->d_name);
}
}
if (closedir(dp) == -1) {
perror("Enabling/disabling channels: "
"Failed to close directory");
return;
}
}
int main(int argc, char **argv)
{
struct iio_event_data event;
const char *device_name;
char *dev_dir_name = NULL;
char *chrdev_name;
int ret;
int dev_num;
int fd, event_fd;
bool all_events = false;
if (argc == 2) {
device_name = argv[1];
} else if (argc == 3) {
device_name = argv[2];
if (!strcmp(argv[1], "-a"))
all_events = true;
} else {
fprintf(stderr,
"Usage: iio_event_monitor [options] <device_name>\n"
"Listen and display events from IIO devices\n"
" -a Auto-activate all available events\n");
return -1;
}
dev_num = find_type_by_name(device_name, "iio:device");
if (dev_num >= 0) {
printf("Found IIO device with name %s with device number %d\n",
device_name, dev_num);
ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
if (ret < 0)
return -ENOMEM;
/* Look up sysfs dir as well if we can */
ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
if (ret < 0)
return -ENOMEM;
} else {
/*
* If we can't find an IIO device by name assume device_name is
* an IIO chrdev
*/
chrdev_name = strdup(device_name);
if (!chrdev_name)
return -ENOMEM;
}
if (all_events && dev_dir_name)
enable_events(dev_dir_name, 1);
fd = open(chrdev_name, 0);
if (fd == -1) {
ret = -errno;
fprintf(stderr, "Failed to open %s\n", chrdev_name);
goto error_free_chrdev_name;
}
ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
if (ret == -1 || event_fd == -1) {
ret = -errno;
if (ret == -ENODEV)
fprintf(stderr,
"This device does not support events\n");
else
fprintf(stderr, "Failed to retrieve event fd\n");
if (close(fd) == -1)
perror("Failed to close character device file");
goto error_free_chrdev_name;
}
if (close(fd) == -1) {
ret = -errno;
goto error_free_chrdev_name;
}
while (true) {
ret = read(event_fd, &event, sizeof(event));
if (ret == -1) {
if (errno == EAGAIN) {
fprintf(stderr, "nothing available\n");
continue;
} else {
ret = -errno;
perror("Failed to read event from device");
break;
}
}
if (ret != sizeof(event)) {
fprintf(stderr, "Reading event failed!\n");
ret = -EIO;
break;
}
print_event(&event);
}
if (close(event_fd) == -1)
perror("Failed to close event file");
error_free_chrdev_name:
/* Disable events after use */
if (all_events && dev_dir_name)
enable_events(dev_dir_name, 0);
free(chrdev_name);
return ret;
}
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