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>
 16 */
 17
 18#include <unistd.h>
 19#include <stdlib.h>
 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"
 28#include <linux/iio/events.h>
 29#include <linux/iio/types.h>
 30
 31static 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",
 47	[IIO_ALTVOLTAGE] = "altvoltage",
 48	[IIO_CCT] = "cct",
 49	[IIO_PRESSURE] = "pressure",
 50	[IIO_HUMIDITYRELATIVE] = "humidityrelative",
 51	[IIO_ACTIVITY] = "activity",
 52	[IIO_STEPS] = "steps",
 53	[IIO_ENERGY] = "energy",
 54	[IIO_DISTANCE] = "distance",
 55	[IIO_VELOCITY] = "velocity",
 56	[IIO_CONCENTRATION] = "concentration",
 57	[IIO_RESISTANCE] = "resistance",
 58	[IIO_PH] = "ph",
 59	[IIO_UVINDEX] = "uvindex",
 60};
 61
 62static const char * const iio_ev_type_text[] = {
 63	[IIO_EV_TYPE_THRESH] = "thresh",
 64	[IIO_EV_TYPE_MAG] = "mag",
 65	[IIO_EV_TYPE_ROC] = "roc",
 66	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
 67	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
 68	[IIO_EV_TYPE_CHANGE] = "change",
 69};
 70
 71static const char * const iio_ev_dir_text[] = {
 72	[IIO_EV_DIR_EITHER] = "either",
 73	[IIO_EV_DIR_RISING] = "rising",
 74	[IIO_EV_DIR_FALLING] = "falling"
 75};
 76
 77static const char * const iio_modifier_names[] = {
 78	[IIO_MOD_X] = "x",
 79	[IIO_MOD_Y] = "y",
 80	[IIO_MOD_Z] = "z",
 81	[IIO_MOD_X_AND_Y] = "x&y",
 82	[IIO_MOD_X_AND_Z] = "x&z",
 83	[IIO_MOD_Y_AND_Z] = "y&z",
 84	[IIO_MOD_X_AND_Y_AND_Z] = "x&y&z",
 85	[IIO_MOD_X_OR_Y] = "x|y",
 86	[IIO_MOD_X_OR_Z] = "x|z",
 87	[IIO_MOD_Y_OR_Z] = "y|z",
 88	[IIO_MOD_X_OR_Y_OR_Z] = "x|y|z",
 89	[IIO_MOD_LIGHT_BOTH] = "both",
 90	[IIO_MOD_LIGHT_IR] = "ir",
 91	[IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
 92	[IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
 93	[IIO_MOD_LIGHT_CLEAR] = "clear",
 94	[IIO_MOD_LIGHT_RED] = "red",
 95	[IIO_MOD_LIGHT_GREEN] = "green",
 96	[IIO_MOD_LIGHT_BLUE] = "blue",
 97	[IIO_MOD_LIGHT_UV] = "uv",
 98	[IIO_MOD_QUATERNION] = "quaternion",
 99	[IIO_MOD_TEMP_AMBIENT] = "ambient",
100	[IIO_MOD_TEMP_OBJECT] = "object",
101	[IIO_MOD_NORTH_MAGN] = "from_north_magnetic",
102	[IIO_MOD_NORTH_TRUE] = "from_north_true",
103	[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
104	[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
105	[IIO_MOD_RUNNING] = "running",
106	[IIO_MOD_JOGGING] = "jogging",
107	[IIO_MOD_WALKING] = "walking",
108	[IIO_MOD_STILL] = "still",
109	[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
110	[IIO_MOD_I] = "i",
111	[IIO_MOD_Q] = "q",
112	[IIO_MOD_CO2] = "co2",
113	[IIO_MOD_VOC] = "voc",
114};
115
116static bool event_is_known(struct iio_event_data *event)
117{
118	enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
119	enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
120	enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
121	enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
122
123	switch (type) {
124	case IIO_VOLTAGE:
125	case IIO_CURRENT:
126	case IIO_POWER:
127	case IIO_ACCEL:
128	case IIO_ANGL_VEL:
129	case IIO_MAGN:
130	case IIO_LIGHT:
131	case IIO_INTENSITY:
132	case IIO_PROXIMITY:
133	case IIO_TEMP:
134	case IIO_INCLI:
135	case IIO_ROT:
136	case IIO_ANGL:
137	case IIO_TIMESTAMP:
138	case IIO_CAPACITANCE:
139	case IIO_ALTVOLTAGE:
140	case IIO_CCT:
141	case IIO_PRESSURE:
142	case IIO_HUMIDITYRELATIVE:
143	case IIO_ACTIVITY:
144	case IIO_STEPS:
145	case IIO_ENERGY:
146	case IIO_DISTANCE:
147	case IIO_VELOCITY:
148	case IIO_CONCENTRATION:
149	case IIO_RESISTANCE:
150	case IIO_PH:
151	case IIO_UVINDEX:
152		break;
153	default:
154		return false;
155	}
156
157	switch (mod) {
158	case IIO_NO_MOD:
159	case IIO_MOD_X:
160	case IIO_MOD_Y:
161	case IIO_MOD_Z:
162	case IIO_MOD_X_AND_Y:
163	case IIO_MOD_X_AND_Z:
164	case IIO_MOD_Y_AND_Z:
165	case IIO_MOD_X_AND_Y_AND_Z:
166	case IIO_MOD_X_OR_Y:
167	case IIO_MOD_X_OR_Z:
168	case IIO_MOD_Y_OR_Z:
169	case IIO_MOD_X_OR_Y_OR_Z:
170	case IIO_MOD_LIGHT_BOTH:
171	case IIO_MOD_LIGHT_IR:
172	case IIO_MOD_ROOT_SUM_SQUARED_X_Y:
173	case IIO_MOD_SUM_SQUARED_X_Y_Z:
174	case IIO_MOD_LIGHT_CLEAR:
175	case IIO_MOD_LIGHT_RED:
176	case IIO_MOD_LIGHT_GREEN:
177	case IIO_MOD_LIGHT_BLUE:
178	case IIO_MOD_LIGHT_UV:
179	case IIO_MOD_QUATERNION:
180	case IIO_MOD_TEMP_AMBIENT:
181	case IIO_MOD_TEMP_OBJECT:
182	case IIO_MOD_NORTH_MAGN:
183	case IIO_MOD_NORTH_TRUE:
184	case IIO_MOD_NORTH_MAGN_TILT_COMP:
185	case IIO_MOD_NORTH_TRUE_TILT_COMP:
186	case IIO_MOD_RUNNING:
187	case IIO_MOD_JOGGING:
188	case IIO_MOD_WALKING:
189	case IIO_MOD_STILL:
190	case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
191	case IIO_MOD_I:
192	case IIO_MOD_Q:
193	case IIO_MOD_CO2:
194	case IIO_MOD_VOC:
195		break;
196	default:
197		return false;
198	}
199
200	switch (ev_type) {
201	case IIO_EV_TYPE_THRESH:
202	case IIO_EV_TYPE_MAG:
203	case IIO_EV_TYPE_ROC:
204	case IIO_EV_TYPE_THRESH_ADAPTIVE:
205	case IIO_EV_TYPE_MAG_ADAPTIVE:
206	case IIO_EV_TYPE_CHANGE:
207		break;
208	default:
209		return false;
210	}
211
212	switch (dir) {
213	case IIO_EV_DIR_EITHER:
214	case IIO_EV_DIR_RISING:
215	case IIO_EV_DIR_FALLING:
216	case IIO_EV_DIR_NONE:
217		break;
218	default:
219		return false;
220	}
221
222	return true;
223}
224
225static void print_event(struct iio_event_data *event)
226{
227	enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
228	enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
229	enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
230	enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
231	int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
232	int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
233	bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
234
235	if (!event_is_known(event)) {
236		fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
237			event->timestamp, event->id);
238
239		return;
240	}
241
242	printf("Event: time: %lld, type: %s", event->timestamp,
243	       iio_chan_type_name_spec[type]);
244
245	if (mod != IIO_NO_MOD)
246		printf("(%s)", iio_modifier_names[mod]);
247
248	if (chan >= 0) {
249		printf(", channel: %d", chan);
250		if (diff && chan2 >= 0)
251			printf("-%d", chan2);
252	}
253
254	printf(", evtype: %s", iio_ev_type_text[ev_type]);
255
256	if (dir != IIO_EV_DIR_NONE)
257		printf(", direction: %s", iio_ev_dir_text[dir]);
258
259	printf("\n");
260}
261
262int main(int argc, char **argv)
263{
264	struct iio_event_data event;
265	const char *device_name;
266	char *chrdev_name;
267	int ret;
268	int dev_num;
269	int fd, event_fd;
270
271	if (argc <= 1) {
272		fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
273		return -1;
274	}
275
276	device_name = argv[1];
277
278	dev_num = find_type_by_name(device_name, "iio:device");
279	if (dev_num >= 0) {
280		printf("Found IIO device with name %s with device number %d\n",
281		       device_name, dev_num);
282		ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
283		if (ret < 0)
284			return -ENOMEM;
285	} else {
286		/*
287		 * If we can't find an IIO device by name assume device_name is
288		 * an IIO chrdev
289		 */
290		chrdev_name = strdup(device_name);
291		if (!chrdev_name)
292			return -ENOMEM;
293	}
294
295	fd = open(chrdev_name, 0);
296	if (fd == -1) {
297		ret = -errno;
298		fprintf(stderr, "Failed to open %s\n", chrdev_name);
299		goto error_free_chrdev_name;
300	}
301
302	ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
303	if (ret == -1 || event_fd == -1) {
304		ret = -errno;
305		if (ret == -ENODEV)
306			fprintf(stderr,
307				"This device does not support events\n");
308		else
309			fprintf(stderr, "Failed to retrieve event fd\n");
310		if (close(fd) == -1)
311			perror("Failed to close character device file");
312
313		goto error_free_chrdev_name;
314	}
315
316	if (close(fd) == -1)  {
317		ret = -errno;
318		goto error_free_chrdev_name;
319	}
320
321	while (true) {
322		ret = read(event_fd, &event, sizeof(event));
323		if (ret == -1) {
324			if (errno == EAGAIN) {
325				fprintf(stderr, "nothing available\n");
326				continue;
327			} else {
328				ret = -errno;
329				perror("Failed to read event from device");
330				break;
331			}
332		}
333
334		if (ret != sizeof(event)) {
335			fprintf(stderr, "Reading event failed!\n");
336			ret = -EIO;
337			break;
338		}
339
340		print_event(&event);
341	}
342
343	if (close(event_fd) == -1)
344		perror("Failed to close event file");
345
346error_free_chrdev_name:
347	free(chrdev_name);
348
349	return ret;
350}

  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>
 16 */
 17
 18#include <unistd.h>
 19#include <stdlib.h>
 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"
 28#include <linux/iio/events.h>
 29#include <linux/iio/types.h>
 30
 31static 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",
 47	[IIO_ALTVOLTAGE] = "altvoltage",
 48	[IIO_CCT] = "cct",
 49	[IIO_PRESSURE] = "pressure",
 50	[IIO_HUMIDITYRELATIVE] = "humidityrelative",
 51	[IIO_ACTIVITY] = "activity",
 52	[IIO_STEPS] = "steps",
 53	[IIO_ENERGY] = "energy",
 54	[IIO_DISTANCE] = "distance",
 55	[IIO_VELOCITY] = "velocity",
 
 
 
 
 56};
 57
 58static 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",
 64	[IIO_EV_TYPE_CHANGE] = "change",
 65};
 66
 67static 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
 73static const char * const iio_modifier_names[] = {
 74	[IIO_MOD_X] = "x",
 75	[IIO_MOD_Y] = "y",
 76	[IIO_MOD_Z] = "z",
 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",
 85	[IIO_MOD_LIGHT_BOTH] = "both",
 86	[IIO_MOD_LIGHT_IR] = "ir",
 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",
 
 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",
100	[IIO_MOD_RUNNING] = "running",
101	[IIO_MOD_JOGGING] = "jogging",
102	[IIO_MOD_WALKING] = "walking",
103	[IIO_MOD_STILL] = "still",
104	[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
 
 
 
 
105};
106
107static 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:
130	case IIO_ALTVOLTAGE:
131	case IIO_CCT:
132	case IIO_PRESSURE:
133	case IIO_HUMIDITYRELATIVE:
134	case IIO_ACTIVITY:
135	case IIO_STEPS:
136	case IIO_ENERGY:
137	case IIO_DISTANCE:
138	case IIO_VELOCITY:
 
 
 
 
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:
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:
157	case IIO_MOD_LIGHT_BOTH:
158	case IIO_MOD_LIGHT_IR:
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:
 
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:
172	case IIO_MOD_RUNNING:
173	case IIO_MOD_JOGGING:
174	case IIO_MOD_WALKING:
175	case IIO_MOD_STILL:
176	case IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z:
 
 
 
 
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:
188	case IIO_EV_TYPE_CHANGE:
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:
198	case IIO_EV_DIR_NONE:
199		break;
200	default:
201		return false;
202	}
203
204	return true;
205}
206
207static 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)) {
218		fprintf(stderr, "Unknown event: time: %lld, id: %llx\n",
219			event->timestamp, event->id);
220
221		return;
222	}
223
224	printf("Event: time: %lld, type: %s", event->timestamp,
225	       iio_chan_type_name_spec[type]);
226
227	if (mod != IIO_NO_MOD)
228		printf("(%s)", iio_modifier_names[mod]);
229
230	if (chan >= 0) {
231		printf(", channel: %d", chan);
232		if (diff && chan2 >= 0)
233			printf("-%d", chan2);
234	}
235
236	printf(", evtype: %s", iio_ev_type_text[ev_type]);
237
238	if (dir != IIO_EV_DIR_NONE)
239		printf(", direction: %s", iio_ev_dir_text[dir]);
240
241	printf("\n");
242}
243
244int 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) {
254		fprintf(stderr, "Usage: %s <device_name>\n", argv[0]);
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",
263		       device_name, dev_num);
264		ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
265		if (ret < 0)
266			return -ENOMEM;
267	} else {
268		/*
269		 * If we can't find an IIO device by name assume device_name is
270		 * an IIO chrdev
271		 */
272		chrdev_name = strdup(device_name);
273		if (!chrdev_name)
274			return -ENOMEM;
275	}
276
277	fd = open(chrdev_name, 0);
278	if (fd == -1) {
279		ret = -errno;
280		fprintf(stderr, "Failed to open %s\n", chrdev_name);
281		goto error_free_chrdev_name;
282	}
283
284	ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
285	if (ret == -1 || event_fd == -1) {
286		ret = -errno;
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");
292		if (close(fd) == -1)
293			perror("Failed to close character device file");
294
295		goto error_free_chrdev_name;
296	}
297
298	if (close(fd) == -1)  {
299		ret = -errno;
300		goto error_free_chrdev_name;
301	}
302
303	while (true) {
304		ret = read(event_fd, &event, sizeof(event));
305		if (ret == -1) {
306			if (errno == EAGAIN) {
307				fprintf(stderr, "nothing available\n");
308				continue;
309			} else {
310				ret = -errno;
311				perror("Failed to read event from device");
312				break;
313			}
314		}
315
316		if (ret != sizeof(event)) {
317			fprintf(stderr, "Reading event failed!\n");
318			ret = -EIO;
319			break;
320		}
321
322		print_event(&event);
323	}
324
325	if (close(event_fd) == -1)
326		perror("Failed to close event file");
327
328error_free_chrdev_name:
329	free(chrdev_name);
330
331	return ret;
332}