tools/iio/iio_event_monitor.c - kernel/msm-4.9 - Gitiles

 /* Industrialio event test code.
  *
  * Copyright (c) 2011-2012 Lars-Peter Clausen <lars@metafoo.de>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  *
  * 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 <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",
 };

 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",
 };

 static const char * const iio_ev_dir_text[] = {
 	[IIO_EV_DIR_EITHER] = "either",
 	[IIO_EV_DIR_RISING] = "rising",
 	[IIO_EV_DIR_FALLING] = "falling"
 };

 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_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)",
 };

 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:
 		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_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:
 		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:
 		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_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");
 }

 int main(int argc, char **argv)
 {
 	struct iio_event_data event;
 	const char *device_name;
 	char *chrdev_name;
 	int ret;
 	int dev_num;
 	int fd, event_fd;

 	if (argc <= 1) {
 		fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
 		return -1;
 	}

 	device_name = argv[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;
 	} 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;
 	}

 	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:
 	free(chrdev_name);

 	return ret;
 }
	/* Industrialio event test code.
	*
	* Copyright (c) 2011-2012 Lars-Peter Clausen <lars@metafoo.de>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	*
	* 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 <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",
	};

	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",
	};

	static const char * const iio_ev_dir_text[] = {
	[IIO_EV_DIR_EITHER] = "either",
	[IIO_EV_DIR_RISING] = "rising",
	[IIO_EV_DIR_FALLING] = "falling"
	};

	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_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)",
	};

	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:
	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_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:
	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:
	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_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");
	}

	int main(int argc, char **argv)
	{
	struct iio_event_data event;
	const char *device_name;
	char *chrdev_name;
	int ret;
	int dev_num;
	int fd, event_fd;

	if (argc <= 1) {
	fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
	return -1;
	}

	device_name = argv[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;
	} 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;
	}

	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:
	free(chrdev_name);

	return ret;
	}