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

/* 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;
}
Commit	Line	Data
7042122f LPC	1	/* Industrialio event test code.
	2	*
	3	* Copyright (c) 2011-2012 Lars-Peter Clausen <lars@metafoo.de>
	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>
7042122f LPC	16	*/
7042122f LPC	17
7042122f	18	#include <unistd.h>
bdcb31d0	19	#include <stdlib.h>
7042122f LPC	20	#include <stdbool.h>
	21	#include <stdio.h>
	22	#include <errno.h>
	23	#include <string.h>
	24	#include <poll.h>
	25	#include <fcntl.h>
	26	#include <sys/ioctl.h>
	27	#include "iio_utils.h"
06458e27	28	#include <linux/iio/events.h>
95763859	29	#include <linux/iio/types.h>
7042122f LPC	30
	31	static const char * const iio_chan_type_name_spec[] = {
	32	[IIO_VOLTAGE] = "voltage",
	33	[IIO_CURRENT] = "current",
	34	[IIO_POWER] = "power",
	35	[IIO_ACCEL] = "accel",
	36	[IIO_ANGL_VEL] = "anglvel",
	37	[IIO_MAGN] = "magn",
	38	[IIO_LIGHT] = "illuminance",
	39	[IIO_INTENSITY] = "intensity",
	40	[IIO_PROXIMITY] = "proximity",
	41	[IIO_TEMP] = "temp",
	42	[IIO_INCLI] = "incli",
	43	[IIO_ROT] = "rot",
	44	[IIO_ANGL] = "angl",
	45	[IIO_TIMESTAMP] = "timestamp",
	46	[IIO_CAPACITANCE] = "capacitance",
a2160146	47	[IIO_ALTVOLTAGE] = "altvoltage",
0378250b PM	48	[IIO_CCT] = "cct",
	49	[IIO_PRESSURE] = "pressure",
	50	[IIO_HUMIDITYRELATIVE] = "humidityrelative",
282a5663 DB	51	[IIO_ACTIVITY] = "activity",
282a5663 DB	52	[IIO_STEPS] = "steps",
30e83267 PM	53	[IIO_ENERGY] = "energy",
	54	[IIO_DISTANCE] = "distance",
	55	[IIO_VELOCITY] = "velocity",
7042122f LPC	56	};
	57
	58	static const char * const iio_ev_type_text[] = {
	59	[IIO_EV_TYPE_THRESH] = "thresh",
	60	[IIO_EV_TYPE_MAG] = "mag",
	61	[IIO_EV_TYPE_ROC] = "roc",
	62	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
	63	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
27be8423	64	[IIO_EV_TYPE_CHANGE] = "change",
7042122f LPC	65	};
	66
	67	static const char * const iio_ev_dir_text[] = {
	68	[IIO_EV_DIR_EITHER] = "either",
	69	[IIO_EV_DIR_RISING] = "rising",
	70	[IIO_EV_DIR_FALLING] = "falling"
	71	};
	72
	73	static const char * const iio_modifier_names[] = {
	74	[IIO_MOD_X] = "x",
	75	[IIO_MOD_Y] = "y",
	76	[IIO_MOD_Z] = "z",
0a6e2170 RD	77	[IIO_MOD_X_AND_Y] = "x&y",
	78	[IIO_MOD_X_AND_Z] = "x&z",
	79	[IIO_MOD_Y_AND_Z] = "y&z",
	80	[IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
	81	[IIO_MOD_X_OR_Y] = "x\|y",
	82	[IIO_MOD_X_OR_Z] = "x\|z",
	83	[IIO_MOD_Y_OR_Z] = "y\|z",
	84	[IIO_MOD_X_OR_Y_OR_Z] = "x\|y\|z",
7042122f LPC	85	[IIO_MOD_LIGHT_BOTH] = "both",
7042122f LPC	86	[IIO_MOD_LIGHT_IR] = "ir",
da4db940 PM	87	[IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
	88	[IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
	89	[IIO_MOD_LIGHT_CLEAR] = "clear",
	90	[IIO_MOD_LIGHT_RED] = "red",
	91	[IIO_MOD_LIGHT_GREEN] = "green",
	92	[IIO_MOD_LIGHT_BLUE] = "blue",
0a6e2170 RD	93	[IIO_MOD_QUATERNION] = "quaternion",
	94	[IIO_MOD_TEMP_AMBIENT] = "ambient",
	95	[IIO_MOD_TEMP_OBJECT] = "object",
	96	[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
	97	[IIO_MOD_NORTH_TRUE] = "from_north_true",
	98	[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
	99	[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
282a5663 DB	100	[IIO_MOD_RUNNING] = "running",
	101	[IIO_MOD_JOGGING] = "jogging",
	102	[IIO_MOD_WALKING] = "walking",
	103	[IIO_MOD_STILL] = "still",
30e83267	104	[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
7042122f LPC	105	};
	106
	107	static bool event_is_known(struct iio_event_data *event)
	108	{
	109	enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
	110	enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
	111	enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
	112	enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
	113
	114	switch (type) {
	115	case IIO_VOLTAGE:
	116	case IIO_CURRENT:
	117	case IIO_POWER:
	118	case IIO_ACCEL:
	119	case IIO_ANGL_VEL:
	120	case IIO_MAGN:
	121	case IIO_LIGHT:
	122	case IIO_INTENSITY:
	123	case IIO_PROXIMITY:
	124	case IIO_TEMP:
	125	case IIO_INCLI:
	126	case IIO_ROT:
	127	case IIO_ANGL:
	128	case IIO_TIMESTAMP:
	129	case IIO_CAPACITANCE:
a2160146	130	case IIO_ALTVOLTAGE:
0378250b PM	131	case IIO_CCT:
	132	case IIO_PRESSURE:
	133	case IIO_HUMIDITYRELATIVE:
282a5663 DB	134	case IIO_ACTIVITY:
282a5663 DB	135	case IIO_STEPS:
30e83267 PM	136	case IIO_ENERGY:
	137	case IIO_DISTANCE:
	138	case IIO_VELOCITY:
7042122f LPC	139	break;
	140	default:
	141	return false;
	142	}
	143
	144	switch (mod) {
	145	case IIO_NO_MOD:
	146	case IIO_MOD_X:
	147	case IIO_MOD_Y:
	148	case IIO_MOD_Z:
0a6e2170 RD	149	case IIO_MOD_X_AND_Y:
	150	case IIO_MOD_X_AND_Z:
	151	case IIO_MOD_Y_AND_Z:
	152	case IIO_MOD_X_AND_Y_AND_Z:
	153	case IIO_MOD_X_OR_Y:
	154	case IIO_MOD_X_OR_Z:
	155	case IIO_MOD_Y_OR_Z:
	156	case IIO_MOD_X_OR_Y_OR_Z:
7042122f LPC	157	case IIO_MOD_LIGHT_BOTH:
7042122f LPC	158	case IIO_MOD_LIGHT_IR:
da4db940 PM	159	case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
	160	case IIO_MOD_SUM_SQUARED_X_Y_Z:
	161	case IIO_MOD_LIGHT_CLEAR:
	162	case IIO_MOD_LIGHT_RED:
	163	case IIO_MOD_LIGHT_GREEN:
	164	case IIO_MOD_LIGHT_BLUE:
0a6e2170 RD	165	case IIO_MOD_QUATERNION:
	166	case IIO_MOD_TEMP_AMBIENT:
	167	case IIO_MOD_TEMP_OBJECT:
	168	case IIO_MOD_NORTH_MAGN:
	169	case IIO_MOD_NORTH_TRUE:
	170	case IIO_MOD_NORTH_MAGN_TILT_COMP:
	171	case IIO_MOD_NORTH_TRUE_TILT_COMP:
282a5663 DB	172	case IIO_MOD_RUNNING:
	173	case IIO_MOD_JOGGING:
	174	case IIO_MOD_WALKING:
	175	case IIO_MOD_STILL:
30e83267	176	case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
7042122f LPC	177	break;
	178	default:
	179	return false;
	180	}
	181
	182	switch (ev_type) {
	183	case IIO_EV_TYPE_THRESH:
	184	case IIO_EV_TYPE_MAG:
	185	case IIO_EV_TYPE_ROC:
	186	case IIO_EV_TYPE_THRESH_ADAPTIVE:
	187	case IIO_EV_TYPE_MAG_ADAPTIVE:
27be8423	188	case IIO_EV_TYPE_CHANGE:
7042122f LPC	189	break;
	190	default:
	191	return false;
	192	}
	193
	194	switch (dir) {
	195	case IIO_EV_DIR_EITHER:
	196	case IIO_EV_DIR_RISING:
	197	case IIO_EV_DIR_FALLING:
282a5663	198	case IIO_EV_DIR_NONE:
7042122f LPC	199	break;
	200	default:
	201	return false;
	202	}
	203
	204	return true;
	205	}
	206
	207	static void print_event(struct iio_event_data *event)
	208	{
	209	enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
	210	enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
	211	enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
	212	enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
	213	int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
	214	int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
	215	bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
	216
	217	if (!event_is_known(event)) {
d9abc615 CO	218	fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
d9abc615 CO	219	event->timestamp, event->id);
7663a4aa	220
7042122f LPC	221	return;
	222	}
	223
916e89e4 HK	224	printf("Event: time: %lld, type: %s", event->timestamp,
916e89e4 HK	225	iio_chan_type_name_spec[type]);
7042122f	226
916e89e4 HK	227	if (mod != IIO_NO_MOD)
916e89e4 HK	228	printf("(%s)", iio_modifier_names[mod]);
7042122f	229
916e89e4 HK	230	if (chan >= 0) {
	231	printf(", channel: %d", chan);
	232	if (diff && chan2 >= 0)
	233	printf("-%d", chan2);
	234	}
7042122f	235
916e89e4	236	printf(", evtype: %s", iio_ev_type_text[ev_type]);
282a5663 DB	237
	238	if (dir != IIO_EV_DIR_NONE)
	239	printf(", direction: %s", iio_ev_dir_text[dir]);
7663a4aa	240
282a5663	241	printf("\n");
7042122f LPC	242	}
	243
	244	int main(int argc, char **argv)
	245	{
	246	struct iio_event_data event;
	247	const char *device_name;
	248	char *chrdev_name;
	249	int ret;
	250	int dev_num;
	251	int fd, event_fd;
	252
	253	if (argc <= 1) {
d9abc615	254	fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
7042122f LPC	255	return -1;
	256	}
	257
	258	device_name = argv[1];
	259
	260	dev_num = find_type_by_name(device_name, "iio:device");
	261	if (dev_num >= 0) {
	262	printf("Found IIO device with name %s with device number %d\n",
7663a4aa	263	device_name, dev_num);
7042122f	264	ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
37d38e2b	265	if (ret < 0)
0e799878	266	return -ENOMEM;
7042122f	267	} else {
7663a4aa HK	268	/*
	269	* If we can't find an IIO device by name assume device_name is
	270	* an IIO chrdev
	271	*/
7042122f	272	chrdev_name = strdup(device_name);
e9e45b43 HK	273	if (!chrdev_name)
e9e45b43 HK	274	return -ENOMEM;
7042122f LPC	275	}
	276
	277	fd = open(chrdev_name, 0);
	278	if (fd == -1) {
7042122f	279	ret = -errno;
d9abc615	280	fprintf(stderr, "Failed to open %s\n", chrdev_name);
7042122f LPC	281	goto error_free_chrdev_name;
	282	}
	283
	284	ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
7042122f	285	if (ret == -1 \|\| event_fd == -1) {
7042122f	286	ret = -errno;
672f93b6 LW	287	if (ret == -ENODEV)
	288	fprintf(stderr,
	289	"This device does not support events\n");
	290	else
	291	fprintf(stderr, "Failed to retrieve event fd\n");
5fdb8c61 HK	292	if (close(fd) == -1)
	293	perror("Failed to close character device file");
	294
7042122f LPC	295	goto error_free_chrdev_name;
	296	}
	297
963f54ce HK	298	if (close(fd) == -1) {
	299	ret = -errno;
	300	goto error_free_chrdev_name;
	301	}
5fdb8c61	302
7042122f LPC	303	while (true) {
	304	ret = read(event_fd, &event, sizeof(event));
	305	if (ret == -1) {
	306	if (errno == EAGAIN) {
d9abc615	307	fprintf(stderr, "nothing available\n");
7042122f LPC	308	continue;
7042122f LPC	309	} else {
7042122f	310	ret = -errno;
2b6a6e67	311	perror("Failed to read event from device");
7042122f LPC	312	break;
	313	}
	314	}
	315
09a33f05	316	if (ret != sizeof(event)) {
d9abc615	317	fprintf(stderr, "Reading event failed!\n");
09a33f05 HK	318	ret = -EIO;
	319	break;
	320	}
	321
7042122f LPC	322	print_event(&event);
	323	}
	324
963f54ce HK	325	if (close(event_fd) == -1)
	326	perror("Failed to close event file");
	327
7042122f LPC	328	error_free_chrdev_name:
7042122f LPC	329	free(chrdev_name);
0e799878	330
7042122f LPC	331	return ret;
7042122f LPC	332	}