[linux.git] / tools / iio / iio_event_monitor.c

/* Industrialio event test code.
 *
 * Copyright (c) 2011-2012 Lars-Peter Clausen <[email protected]>
 *
 * 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",
};

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",
};

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:
		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:
		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)) {
		printf("Unknown event: time: %lld, id: %llx\n",
				event->timestamp, event->id);
		return;
	}

	printf("Event: time: %lld, ", event->timestamp);

	if (mod != IIO_NO_MOD) {
		printf("type: %s(%s), ",
			iio_chan_type_name_spec[type],
			iio_modifier_names[mod]);
	} else {
		printf("type: %s, ",
			iio_chan_type_name_spec[type]);
	}

	if (diff && chan >= 0 && chan2 >= 0)
		printf("channel: %d-%d, ", chan, chan2);
	else if (chan >= 0)
		printf("channel: %d, ", chan);

	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) {
		printf("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) {
			ret = -ENOMEM;
			goto error_ret;
		}
	} else {
		/* If we can't find a IIO device by name assume device_name is a
		   IIO chrdev */
		chrdev_name = strdup(device_name);
	}

	fd = open(chrdev_name, 0);
	if (fd == -1) {
		ret = -errno;
		fprintf(stdout, "Failed to open %s\n", chrdev_name);
		goto error_free_chrdev_name;
	}

	ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);

	close(fd);

	if (ret == -1 || event_fd == -1) {
		ret = -errno;
		fprintf(stdout, "Failed to retrieve event fd\n");
		goto error_free_chrdev_name;
	}

	while (true) {
		ret = read(event_fd, &event, sizeof(event));
		if (ret == -1) {
			if (errno == EAGAIN) {
				printf("nothing available\n");
				continue;
			} else {
				ret = -errno;
				perror("Failed to read event from device");
				break;
			}
		}

		print_event(&event);
	}

	close(event_fd);
error_free_chrdev_name:
	free(chrdev_name);
error_ret:
	return ret;
}
Commit	Line	Data
7042122f LPC	1	/* Industrialio event test code.
	2	*
	3	* Copyright (c) 2011-2012 Lars-Peter Clausen <[email protected]>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 as published by
	7	* the Free Software Foundation.
	8	*
	9	* This program is primarily intended as an example application.
	10	* Reads the current buffer setup from sysfs and starts a short capture
	11	* from the specified device, pretty printing the result after appropriate
	12	* conversion.
	13	*
	14	* Usage:
	15	* iio_event_monitor <device_name>
	16	*
	17	*/
	18
7042122f	19	#include <unistd.h>
bdcb31d0	20	#include <stdlib.h>
7042122f LPC	21	#include <stdbool.h>
	22	#include <stdio.h>
	23	#include <errno.h>
	24	#include <string.h>
	25	#include <poll.h>
	26	#include <fcntl.h>
	27	#include <sys/ioctl.h>
	28	#include "iio_utils.h"
06458e27	29	#include <linux/iio/events.h>
95763859	30	#include <linux/iio/types.h>
7042122f LPC	31
	32	static const char * const iio_chan_type_name_spec[] = {
	33	[IIO_VOLTAGE] = "voltage",
	34	[IIO_CURRENT] = "current",
	35	[IIO_POWER] = "power",
	36	[IIO_ACCEL] = "accel",
	37	[IIO_ANGL_VEL] = "anglvel",
	38	[IIO_MAGN] = "magn",
	39	[IIO_LIGHT] = "illuminance",
	40	[IIO_INTENSITY] = "intensity",
	41	[IIO_PROXIMITY] = "proximity",
	42	[IIO_TEMP] = "temp",
	43	[IIO_INCLI] = "incli",
	44	[IIO_ROT] = "rot",
	45	[IIO_ANGL] = "angl",
	46	[IIO_TIMESTAMP] = "timestamp",
	47	[IIO_CAPACITANCE] = "capacitance",
a2160146	48	[IIO_ALTVOLTAGE] = "altvoltage",
0378250b PM	49	[IIO_CCT] = "cct",
	50	[IIO_PRESSURE] = "pressure",
	51	[IIO_HUMIDITYRELATIVE] = "humidityrelative",
282a5663 DB	52	[IIO_ACTIVITY] = "activity",
282a5663 DB	53	[IIO_STEPS] = "steps",
7042122f LPC	54	};
	55
	56	static const char * const iio_ev_type_text[] = {
	57	[IIO_EV_TYPE_THRESH] = "thresh",
	58	[IIO_EV_TYPE_MAG] = "mag",
	59	[IIO_EV_TYPE_ROC] = "roc",
	60	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
	61	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
27be8423	62	[IIO_EV_TYPE_CHANGE] = "change",
7042122f LPC	63	};
	64
	65	static const char * const iio_ev_dir_text[] = {
	66	[IIO_EV_DIR_EITHER] = "either",
	67	[IIO_EV_DIR_RISING] = "rising",
	68	[IIO_EV_DIR_FALLING] = "falling"
	69	};
	70
	71	static const char * const iio_modifier_names[] = {
	72	[IIO_MOD_X] = "x",
	73	[IIO_MOD_Y] = "y",
	74	[IIO_MOD_Z] = "z",
0a6e2170 RD	75	[IIO_MOD_X_AND_Y] = "x&y",
	76	[IIO_MOD_X_AND_Z] = "x&z",
	77	[IIO_MOD_Y_AND_Z] = "y&z",
	78	[IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
	79	[IIO_MOD_X_OR_Y] = "x\|y",
	80	[IIO_MOD_X_OR_Z] = "x\|z",
	81	[IIO_MOD_Y_OR_Z] = "y\|z",
	82	[IIO_MOD_X_OR_Y_OR_Z] = "x\|y\|z",
7042122f LPC	83	[IIO_MOD_LIGHT_BOTH] = "both",
7042122f LPC	84	[IIO_MOD_LIGHT_IR] = "ir",
da4db940 PM	85	[IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
	86	[IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
	87	[IIO_MOD_LIGHT_CLEAR] = "clear",
	88	[IIO_MOD_LIGHT_RED] = "red",
	89	[IIO_MOD_LIGHT_GREEN] = "green",
	90	[IIO_MOD_LIGHT_BLUE] = "blue",
0a6e2170 RD	91	[IIO_MOD_QUATERNION] = "quaternion",
	92	[IIO_MOD_TEMP_AMBIENT] = "ambient",
	93	[IIO_MOD_TEMP_OBJECT] = "object",
	94	[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
	95	[IIO_MOD_NORTH_TRUE] = "from_north_true",
	96	[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
	97	[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
282a5663 DB	98	[IIO_MOD_RUNNING] = "running",
	99	[IIO_MOD_JOGGING] = "jogging",
	100	[IIO_MOD_WALKING] = "walking",
	101	[IIO_MOD_STILL] = "still",
7042122f LPC	102	};
	103
	104	static bool event_is_known(struct iio_event_data *event)
	105	{
	106	enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
	107	enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
	108	enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
	109	enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
	110
	111	switch (type) {
	112	case IIO_VOLTAGE:
	113	case IIO_CURRENT:
	114	case IIO_POWER:
	115	case IIO_ACCEL:
	116	case IIO_ANGL_VEL:
	117	case IIO_MAGN:
	118	case IIO_LIGHT:
	119	case IIO_INTENSITY:
	120	case IIO_PROXIMITY:
	121	case IIO_TEMP:
	122	case IIO_INCLI:
	123	case IIO_ROT:
	124	case IIO_ANGL:
	125	case IIO_TIMESTAMP:
	126	case IIO_CAPACITANCE:
a2160146	127	case IIO_ALTVOLTAGE:
0378250b PM	128	case IIO_CCT:
	129	case IIO_PRESSURE:
	130	case IIO_HUMIDITYRELATIVE:
282a5663 DB	131	case IIO_ACTIVITY:
282a5663 DB	132	case IIO_STEPS:
7042122f LPC	133	break;
	134	default:
	135	return false;
	136	}
	137
	138	switch (mod) {
	139	case IIO_NO_MOD:
	140	case IIO_MOD_X:
	141	case IIO_MOD_Y:
	142	case IIO_MOD_Z:
0a6e2170 RD	143	case IIO_MOD_X_AND_Y:
	144	case IIO_MOD_X_AND_Z:
	145	case IIO_MOD_Y_AND_Z:
	146	case IIO_MOD_X_AND_Y_AND_Z:
	147	case IIO_MOD_X_OR_Y:
	148	case IIO_MOD_X_OR_Z:
	149	case IIO_MOD_Y_OR_Z:
	150	case IIO_MOD_X_OR_Y_OR_Z:
7042122f LPC	151	case IIO_MOD_LIGHT_BOTH:
7042122f LPC	152	case IIO_MOD_LIGHT_IR:
da4db940 PM	153	case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
	154	case IIO_MOD_SUM_SQUARED_X_Y_Z:
	155	case IIO_MOD_LIGHT_CLEAR:
	156	case IIO_MOD_LIGHT_RED:
	157	case IIO_MOD_LIGHT_GREEN:
	158	case IIO_MOD_LIGHT_BLUE:
0a6e2170 RD	159	case IIO_MOD_QUATERNION:
	160	case IIO_MOD_TEMP_AMBIENT:
	161	case IIO_MOD_TEMP_OBJECT:
	162	case IIO_MOD_NORTH_MAGN:
	163	case IIO_MOD_NORTH_TRUE:
	164	case IIO_MOD_NORTH_MAGN_TILT_COMP:
	165	case IIO_MOD_NORTH_TRUE_TILT_COMP:
282a5663 DB	166	case IIO_MOD_RUNNING:
	167	case IIO_MOD_JOGGING:
	168	case IIO_MOD_WALKING:
	169	case IIO_MOD_STILL:
7042122f LPC	170	break;
	171	default:
	172	return false;
	173	}
	174
	175	switch (ev_type) {
	176	case IIO_EV_TYPE_THRESH:
	177	case IIO_EV_TYPE_MAG:
	178	case IIO_EV_TYPE_ROC:
	179	case IIO_EV_TYPE_THRESH_ADAPTIVE:
	180	case IIO_EV_TYPE_MAG_ADAPTIVE:
27be8423	181	case IIO_EV_TYPE_CHANGE:
7042122f LPC	182	break;
	183	default:
	184	return false;
	185	}
	186
	187	switch (dir) {
	188	case IIO_EV_DIR_EITHER:
	189	case IIO_EV_DIR_RISING:
	190	case IIO_EV_DIR_FALLING:
282a5663	191	case IIO_EV_DIR_NONE:
7042122f LPC	192	break;
	193	default:
	194	return false;
	195	}
	196
	197	return true;
	198	}
	199
	200	static void print_event(struct iio_event_data *event)
	201	{
	202	enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
	203	enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
	204	enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
	205	enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
	206	int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
	207	int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
	208	bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
	209
	210	if (!event_is_known(event)) {
	211	printf("Unknown event: time: %lld, id: %llx\n",
	212	event->timestamp, event->id);
	213	return;
	214	}
	215
	216	printf("Event: time: %lld, ", event->timestamp);
	217
	218	if (mod != IIO_NO_MOD) {
	219	printf("type: %s(%s), ",
	220	iio_chan_type_name_spec[type],
	221	iio_modifier_names[mod]);
	222	} else {
	223	printf("type: %s, ",
	224	iio_chan_type_name_spec[type]);
	225	}
	226
	227	if (diff && chan >= 0 && chan2 >= 0)
	228	printf("channel: %d-%d, ", chan, chan2);
	229	else if (chan >= 0)
	230	printf("channel: %d, ", chan);
	231
282a5663 DB	232	printf("evtype: %s", iio_ev_type_text[ev_type]);
	233
	234	if (dir != IIO_EV_DIR_NONE)
	235	printf(", direction: %s", iio_ev_dir_text[dir]);
	236	printf("\n");
7042122f LPC	237	}
	238
	239	int main(int argc, char **argv)
	240	{
	241	struct iio_event_data event;
	242	const char *device_name;
	243	char *chrdev_name;
	244	int ret;
	245	int dev_num;
	246	int fd, event_fd;
	247
	248	if (argc <= 1) {
	249	printf("Usage: %s <device_name>\n", argv[0]);
	250	return -1;
	251	}
	252
	253	device_name = argv[1];
	254
	255	dev_num = find_type_by_name(device_name, "iio:device");
	256	if (dev_num >= 0) {
	257	printf("Found IIO device with name %s with device number %d\n",
	258	device_name, dev_num);
	259	ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
	260	if (ret < 0) {
	261	ret = -ENOMEM;
	262	goto error_ret;
	263	}
	264	} else {
	265	/* If we can't find a IIO device by name assume device_name is a
	266	IIO chrdev */
	267	chrdev_name = strdup(device_name);
	268	}
	269
	270	fd = open(chrdev_name, 0);
	271	if (fd == -1) {
7042122f	272	ret = -errno;
2b6a6e67	273	fprintf(stdout, "Failed to open %s\n", chrdev_name);
7042122f LPC	274	goto error_free_chrdev_name;
	275	}
	276
	277	ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
	278
	279	close(fd);
	280
	281	if (ret == -1 \|\| event_fd == -1) {
7042122f	282	ret = -errno;
2b6a6e67	283	fprintf(stdout, "Failed to retrieve event fd\n");
7042122f LPC	284	goto error_free_chrdev_name;
	285	}
	286
	287	while (true) {
	288	ret = read(event_fd, &event, sizeof(event));
	289	if (ret == -1) {
	290	if (errno == EAGAIN) {
	291	printf("nothing available\n");
	292	continue;
	293	} else {
7042122f	294	ret = -errno;
2b6a6e67	295	perror("Failed to read event from device");
7042122f LPC	296	break;
	297	}
	298	}
	299
	300	print_event(&event);
	301	}
	302
	303	close(event_fd);
	304	error_free_chrdev_name:
	305	free(chrdev_name);
	306	error_ret:
	307	return ret;
	308	}