[mirror_ubuntu-bionic-kernel.git] / tools / iio / iio_generic_buffer.c

/* Industrialio buffer test code.
 *
 * Copyright (c) 2008 Jonathan Cameron
 *
 * 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.
 *
 * Command line parameters
 * generic_buffer -n <device_name> -t <trigger_name>
 * If trigger name is not specified the program assumes you want a dataready
 * trigger associated with the device and goes looking for it.
 *
 */

#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/dir.h>
#include <linux/types.h>
#include <string.h>
#include <poll.h>
#include <endian.h>
#include <getopt.h>
#include <inttypes.h>
#include <stdbool.h>
#include <signal.h>
#include "iio_utils.h"

/**
 * enum autochan - state for the automatic channel enabling mechanism
 */
enum autochan {
	AUTOCHANNELS_DISABLED,
	AUTOCHANNELS_ENABLED,
	AUTOCHANNELS_ACTIVE,
};

/**
 * size_from_channelarray() - calculate the storage size of a scan
 * @channels:		the channel info array
 * @num_channels:	number of channels
 *
 * Has the side effect of filling the channels[i].location values used
 * in processing the buffer output.
 **/
int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
{
	int bytes = 0;
	int i = 0;

	while (i < num_channels) {
		if (bytes % channels[i].bytes == 0)
			channels[i].location = bytes;
		else
			channels[i].location = bytes - bytes % channels[i].bytes
					       + channels[i].bytes;

		bytes = channels[i].location + channels[i].bytes;
		i++;
	}

	return bytes;
}

void print1byte(uint8_t input, struct iio_channel_info *info)
{
	/*
	 * Shift before conversion to avoid sign extension
	 * of left aligned data
	 */
	input >>= info->shift;
	input &= info->mask;
	if (info->is_signed) {
		int8_t val = (int8_t)(input << (8 - info->bits_used)) >>
			     (8 - info->bits_used);
		printf("%05f ", ((float)val + info->offset) * info->scale);
	} else {
		printf("%05f ", ((float)input + info->offset) * info->scale);
	}
}

void print2byte(uint16_t input, struct iio_channel_info *info)
{
	/* First swap if incorrect endian */
	if (info->be)
		input = be16toh(input);
	else
		input = le16toh(input);

	/*
	 * Shift before conversion to avoid sign extension
	 * of left aligned data
	 */
	input >>= info->shift;
	input &= info->mask;
	if (info->is_signed) {
		int16_t val = (int16_t)(input << (16 - info->bits_used)) >>
			      (16 - info->bits_used);
		printf("%05f ", ((float)val + info->offset) * info->scale);
	} else {
		printf("%05f ", ((float)input + info->offset) * info->scale);
	}
}

void print4byte(uint32_t input, struct iio_channel_info *info)
{
	/* First swap if incorrect endian */
	if (info->be)
		input = be32toh(input);
	else
		input = le32toh(input);

	/*
	 * Shift before conversion to avoid sign extension
	 * of left aligned data
	 */
	input >>= info->shift;
	input &= info->mask;
	if (info->is_signed) {
		int32_t val = (int32_t)(input << (32 - info->bits_used)) >>
			      (32 - info->bits_used);
		printf("%05f ", ((float)val + info->offset) * info->scale);
	} else {
		printf("%05f ", ((float)input + info->offset) * info->scale);
	}
}

void print8byte(uint64_t input, struct iio_channel_info *info)
{
	/* First swap if incorrect endian */
	if (info->be)
		input = be64toh(input);
	else
		input = le64toh(input);

	/*
	 * Shift before conversion to avoid sign extension
	 * of left aligned data
	 */
	input >>= info->shift;
	input &= info->mask;
	if (info->is_signed) {
		int64_t val = (int64_t)(input << (64 - info->bits_used)) >>
			      (64 - info->bits_used);
		/* special case for timestamp */
		if (info->scale == 1.0f && info->offset == 0.0f)
			printf("%" PRId64 " ", val);
		else
			printf("%05f ",
			       ((float)val + info->offset) * info->scale);
	} else {
		printf("%05f ", ((float)input + info->offset) * info->scale);
	}
}

/**
 * process_scan() - print out the values in SI units
 * @data:		pointer to the start of the scan
 * @channels:		information about the channels.
 *			Note: size_from_channelarray must have been called first
 *			      to fill the location offsets.
 * @num_channels:	number of channels
 **/
void process_scan(char *data,
		  struct iio_channel_info *channels,
		  int num_channels)
{
	int k;

	for (k = 0; k < num_channels; k++)
		switch (channels[k].bytes) {
			/* only a few cases implemented so far */
		case 1:
			print1byte(*(uint8_t *)(data + channels[k].location),
				   &channels[k]);
			break;
		case 2:
			print2byte(*(uint16_t *)(data + channels[k].location),
				   &channels[k]);
			break;
		case 4:
			print4byte(*(uint32_t *)(data + channels[k].location),
				   &channels[k]);
			break;
		case 8:
			print8byte(*(uint64_t *)(data + channels[k].location),
				   &channels[k]);
			break;
		default:
			break;
		}
	printf("\n");
}

static int enable_disable_all_channels(char *dev_dir_name, int enable)
{
	const struct dirent *ent;
	char scanelemdir[256];
	DIR *dp;
	int ret;

	snprintf(scanelemdir, sizeof(scanelemdir),
		 FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name);
	scanelemdir[sizeof(scanelemdir)-1] = '\0';

	dp = opendir(scanelemdir);
	if (!dp) {
		fprintf(stderr, "Enabling/disabling channels: can't open %s\n",
			scanelemdir);
		return -EIO;
	}

	ret = -ENOENT;
	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, scanelemdir,
					      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 -errno;
	}
	return 0;
}

void print_usage(void)
{
	fprintf(stderr, "Usage: generic_buffer [options]...\n"
		"Capture, convert and output data from IIO device buffer\n"
		"  -a         Auto-activate all available channels\n"
		"  -c <n>     Do n conversions\n"
		"  -e         Disable wait for event (new data)\n"
		"  -g         Use trigger-less mode\n"
		"  -l <n>     Set buffer length to n samples\n"
		"  --device-name -n <name>\n"
		"  --device-num -N <num>\n"
		"        Set device by name or number (mandatory)\n"
		"  --trigger-name -t <name>\n"
		"  --trigger-num -T <num>\n"
		"        Set trigger by name or number\n"
		"  -w <n>     Set delay between reads in us (event-less mode)\n");
}

enum autochan autochannels = AUTOCHANNELS_DISABLED;
char *dev_dir_name = NULL;
char *buf_dir_name = NULL;
bool current_trigger_set = false;

void cleanup(void)
{
	int ret;

	/* Disable trigger */
	if (dev_dir_name && current_trigger_set) {
		/* Disconnect the trigger - just write a dummy name. */
		ret = write_sysfs_string("trigger/current_trigger",
					 dev_dir_name, "NULL");
		if (ret < 0)
			fprintf(stderr, "Failed to disable trigger: %s\n",
				strerror(-ret));
		current_trigger_set = false;
	}

	/* Disable buffer */
	if (buf_dir_name) {
		ret = write_sysfs_int("enable", buf_dir_name, 0);
		if (ret < 0)
			fprintf(stderr, "Failed to disable buffer: %s\n",
				strerror(-ret));
	}

	/* Disable channels if auto-enabled */
	if (dev_dir_name && autochannels == AUTOCHANNELS_ACTIVE) {
		ret = enable_disable_all_channels(dev_dir_name, 0);
		if (ret)
			fprintf(stderr, "Failed to disable all channels\n");
		autochannels = AUTOCHANNELS_DISABLED;
	}
}

void sig_handler(int signum)
{
	fprintf(stderr, "Caught signal %d\n", signum);
	cleanup();
	exit(-signum);
}

void register_cleanup(void)
{
	struct sigaction sa = { .sa_handler = sig_handler };
	const int signums[] = { SIGINT, SIGTERM, SIGABRT };
	int ret, i;

	for (i = 0; i < ARRAY_SIZE(signums); ++i) {
		ret = sigaction(signums[i], &sa, NULL);
		if (ret) {
			perror("Failed to register signal handler");
			exit(-1);
		}
	}
}

static const struct option longopts[] = {
	{ "device-name",	1, 0, 'n' },
	{ "device-num",		1, 0, 'N' },
	{ "trigger-name",	1, 0, 't' },
	{ "trigger-num",	1, 0, 'T' },
	{ },
};

int main(int argc, char **argv)
{
	unsigned long num_loops = 2;
	unsigned long timedelay = 1000000;
	unsigned long buf_len = 128;

	int ret, c, i, j, toread;
	int fp = -1;

	int num_channels = 0;
	char *trigger_name = NULL, *device_name = NULL;

	char *data = NULL;
	ssize_t read_size;
	int dev_num = -1, trig_num = -1;
	char *buffer_access = NULL;
	int scan_size;
	int noevents = 0;
	int notrigger = 0;
	char *dummy;

	struct iio_channel_info *channels = NULL;

	register_cleanup();

	while ((c = getopt_long(argc, argv, "ac:egl:n:N:t:T:w:", longopts, NULL)) != -1) {
		switch (c) {
		case 'a':
			autochannels = AUTOCHANNELS_ENABLED;
			break;
		case 'c':
			errno = 0;
			num_loops = strtoul(optarg, &dummy, 10);
			if (errno) {
				ret = -errno;
				goto error;
			}

			break;
		case 'e':
			noevents = 1;
			break;
		case 'g':
			notrigger = 1;
			break;
		case 'l':
			errno = 0;
			buf_len = strtoul(optarg, &dummy, 10);
			if (errno) {
				ret = -errno;
				goto error;
			}

			break;
		case 'n':
			device_name = strdup(optarg);
			break;
		case 'N':
			errno = 0;
			dev_num = strtoul(optarg, &dummy, 10);
			if (errno) {
				ret = -errno;
				goto error;
			}
			break;
		case 't':
			trigger_name = strdup(optarg);
			break;
		case 'T':
			errno = 0;
			trig_num = strtoul(optarg, &dummy, 10);
			if (errno)
				return -errno;
			break;
		case 'w':
			errno = 0;
			timedelay = strtoul(optarg, &dummy, 10);
			if (errno) {
				ret = -errno;
				goto error;
			}
			break;
		case '?':
			print_usage();
			ret = -1;
			goto error;
		}
	}

	/* Find the device requested */
	if (dev_num < 0 && !device_name) {
		fprintf(stderr, "Device not set\n");
		print_usage();
		ret = -1;
		goto error;
	} else if (dev_num >= 0 && device_name) {
		fprintf(stderr, "Only one of --device-num or --device-name needs to be set\n");
		print_usage();
		ret = -1;
		goto error;
	} else if (dev_num < 0) {
		dev_num = find_type_by_name(device_name, "iio:device");
		if (dev_num < 0) {
			fprintf(stderr, "Failed to find the %s\n", device_name);
			ret = dev_num;
			goto error;
		}
	}
	printf("iio device number being used is %d\n", dev_num);

	ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
	if (ret < 0)
		return -ENOMEM;
	/* Fetch device_name if specified by number */
	if (!device_name) {
		device_name = malloc(IIO_MAX_NAME_LENGTH);
		if (!device_name) {
			ret = -ENOMEM;
			goto error;
		}
		ret = read_sysfs_string("name", dev_dir_name, device_name);
		if (ret < 0) {
			fprintf(stderr, "Failed to read name of device %d\n", dev_num);
			goto error;
		}
	}

	if (notrigger) {
		printf("trigger-less mode selected\n");
	} else if (trig_num >= 0) {
		char *trig_dev_name;
		ret = asprintf(&trig_dev_name, "%strigger%d", iio_dir, trig_num);
		if (ret < 0) {
			return -ENOMEM;
		}
		trigger_name = malloc(IIO_MAX_NAME_LENGTH);
		ret = read_sysfs_string("name", trig_dev_name, trigger_name);
		free(trig_dev_name);
		if (ret < 0) {
			fprintf(stderr, "Failed to read trigger%d name from\n", trig_num);
			return ret;
		}
		printf("iio trigger number being used is %d\n", trig_num);
	} else {
		if (!trigger_name) {
			/*
			 * Build the trigger name. If it is device associated
			 * its name is <device_name>_dev[n] where n matches
			 * the device number found above.
			 */
			ret = asprintf(&trigger_name,
				       "%s-dev%d", device_name, dev_num);
			if (ret < 0) {
				ret = -ENOMEM;
				goto error;
			}
		}

		/* Look for this "-devN" trigger */
		trig_num = find_type_by_name(trigger_name, "trigger");
		if (trig_num < 0) {
			/* OK try the simpler "-trigger" suffix instead */
			free(trigger_name);
			ret = asprintf(&trigger_name,
				       "%s-trigger", device_name);
			if (ret < 0) {
				ret = -ENOMEM;
				goto error;
			}
		}

		trig_num = find_type_by_name(trigger_name, "trigger");
		if (trig_num < 0) {
			fprintf(stderr, "Failed to find the trigger %s\n",
				trigger_name);
			ret = trig_num;
			goto error;
		}

		printf("iio trigger number being used is %d\n", trig_num);
	}

	/*
	 * Parse the files in scan_elements to identify what channels are
	 * present
	 */
	ret = build_channel_array(dev_dir_name, &channels, &num_channels);
	if (ret) {
		fprintf(stderr, "Problem reading scan element information\n"
			"diag %s\n", dev_dir_name);
		goto error;
	}
	if (num_channels && autochannels == AUTOCHANNELS_ENABLED) {
		fprintf(stderr, "Auto-channels selected but some channels "
			"are already activated in sysfs\n");
		fprintf(stderr, "Proceeding without activating any channels\n");
	}

	if (!num_channels && autochannels == AUTOCHANNELS_ENABLED) {
		fprintf(stderr,
			"No channels are enabled, enabling all channels\n");

		ret = enable_disable_all_channels(dev_dir_name, 1);
		if (ret) {
			fprintf(stderr, "Failed to enable all channels\n");
			goto error;
		}

		/* This flags that we need to disable the channels again */
		autochannels = AUTOCHANNELS_ACTIVE;

		ret = build_channel_array(dev_dir_name, &channels,
					  &num_channels);
		if (ret) {
			fprintf(stderr, "Problem reading scan element "
				"information\n"
				"diag %s\n", dev_dir_name);
			goto error;
		}
		if (!num_channels) {
			fprintf(stderr, "Still no channels after "
				"auto-enabling, giving up\n");
			goto error;
		}
	}

	if (!num_channels && autochannels == AUTOCHANNELS_DISABLED) {
		fprintf(stderr,
			"No channels are enabled, we have nothing to scan.\n");
		fprintf(stderr, "Enable channels manually in "
			FORMAT_SCAN_ELEMENTS_DIR
			"/*_en or pass -a to autoenable channels and "
			"try again.\n", dev_dir_name);
		ret = -ENOENT;
		goto error;
	}

	/*
	 * Construct the directory name for the associated buffer.
	 * As we know that the lis3l02dq has only one buffer this may
	 * be built rather than found.
	 */
	ret = asprintf(&buf_dir_name,
		       "%siio:device%d/buffer", iio_dir, dev_num);
	if (ret < 0) {
		ret = -ENOMEM;
		goto error;
	}

	if (!notrigger) {
		printf("%s %s\n", dev_dir_name, trigger_name);
		/*
		 * Set the device trigger to be the data ready trigger found
		 * above
		 */
		ret = write_sysfs_string_and_verify("trigger/current_trigger",
						    dev_dir_name,
						    trigger_name);
		if (ret < 0) {
			fprintf(stderr,
				"Failed to write current_trigger file\n");
			goto error;
		}
	}

	/* Setup ring buffer parameters */
	ret = write_sysfs_int("length", buf_dir_name, buf_len);
	if (ret < 0)
		goto error;

	/* Enable the buffer */
	ret = write_sysfs_int("enable", buf_dir_name, 1);
	if (ret < 0) {
		fprintf(stderr,
			"Failed to enable buffer: %s\n", strerror(-ret));
		goto error;
	}

	scan_size = size_from_channelarray(channels, num_channels);
	data = malloc(scan_size * buf_len);
	if (!data) {
		ret = -ENOMEM;
		goto error;
	}

	ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num);
	if (ret < 0) {
		ret = -ENOMEM;
		goto error;
	}

	/* Attempt to open non blocking the access dev */
	fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
	if (fp == -1) { /* TODO: If it isn't there make the node */
		ret = -errno;
		fprintf(stderr, "Failed to open %s\n", buffer_access);
		goto error;
	}

	for (j = 0; j < num_loops; j++) {
		if (!noevents) {
			struct pollfd pfd = {
				.fd = fp,
				.events = POLLIN,
			};

			ret = poll(&pfd, 1, -1);
			if (ret < 0) {
				ret = -errno;
				goto error;
			} else if (ret == 0) {
				continue;
			}

			toread = buf_len;
		} else {
			usleep(timedelay);
			toread = 64;
		}

		read_size = read(fp, data, toread * scan_size);
		if (read_size < 0) {
			if (errno == EAGAIN) {
				fprintf(stderr, "nothing available\n");
				continue;
			} else {
				break;
			}
		}
		for (i = 0; i < read_size / scan_size; i++)
			process_scan(data + scan_size * i, channels,
				     num_channels);
	}

error:
	cleanup();

	if (fp >= 0 && close(fp) == -1)
		perror("Failed to close buffer");
	free(buffer_access);
	free(data);
	free(buf_dir_name);
	for (i = num_channels - 1; i >= 0; i--) {
		free(channels[i].name);
		free(channels[i].generic_name);
	}
	free(channels);
	free(trigger_name);
	free(device_name);
	free(dev_dir_name);

	return ret;
}
Commit	Line	Data
e58537cc JC	1	/* Industrialio buffer test code.
	2	*
	3	* Copyright (c) 2008 Jonathan Cameron
	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	* Command line parameters
	15	* generic_buffer -n <device_name> -t <trigger_name>
	16	* If trigger name is not specified the program assumes you want a dataready
	17	* trigger associated with the device and goes looking for it.
	18	*
	19	*/
	20
	21	#include <unistd.h>
bdcb31d0	22	#include <stdlib.h>
e58537cc JC	23	#include <dirent.h>
	24	#include <fcntl.h>
	25	#include <stdio.h>
	26	#include <errno.h>
	27	#include <sys/stat.h>
	28	#include <sys/dir.h>
	29	#include <linux/types.h>
30268a3d	30	#include <string.h>
52615d47	31	#include <poll.h>
117cf8b7	32	#include <endian.h>
bb23378c	33	#include <getopt.h>
1bcdfbcf	34	#include <inttypes.h>
4f20d592 CDL	35	#include <stdbool.h>
4f20d592 CDL	36	#include <signal.h>
e58537cc JC	37	#include "iio_utils.h"
e58537cc JC	38
5f991a92 LW	39	/**
	40	* enum autochan - state for the automatic channel enabling mechanism
	41	*/
	42	enum autochan {
	43	AUTOCHANNELS_DISABLED,
	44	AUTOCHANNELS_ENABLED,
	45	AUTOCHANNELS_ACTIVE,
	46	};
	47
e58537cc JC	48	/**
e58537cc JC	49	* size_from_channelarray() - calculate the storage size of a scan
d8da0eee PM	50	* @channels: the channel info array
d8da0eee PM	51	* @num_channels: number of channels
e58537cc JC	52	*
	53	* Has the side effect of filling the channels[i].location values used
	54	* in processing the buffer output.
	55	**/
	56	int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
	57	{
	58	int bytes = 0;
	59	int i = 0;
ff39a252	60
e58537cc JC	61	while (i < num_channels) {
	62	if (bytes % channels[i].bytes == 0)
	63	channels[i].location = bytes;
	64	else
7663a4aa HK	65	channels[i].location = bytes - bytes % channels[i].bytes
	66	+ channels[i].bytes;
	67
e58537cc JC	68	bytes = channels[i].location + channels[i].bytes;
	69	i++;
	70	}
7663a4aa	71
e58537cc JC	72	return bytes;
	73	}
	74
e8d0927a TB	75	void print1byte(uint8_t input, struct iio_channel_info *info)
	76	{
	77	/*
	78	* Shift before conversion to avoid sign extension
	79	* of left aligned data
	80	*/
	81	input >>= info->shift;
	82	input &= info->mask;
	83	if (info->is_signed) {
	84	int8_t val = (int8_t)(input << (8 - info->bits_used)) >>
	85	(8 - info->bits_used);
	86	printf("%05f ", ((float)val + info->offset) * info->scale);
	87	} else {
	88	printf("%05f ", ((float)input + info->offset) * info->scale);
	89	}
	90	}
	91
8e926134	92	void print2byte(uint16_t input, struct iio_channel_info *info)
52615d47	93	{
117cf8b7	94	/* First swap if incorrect endian */
117cf8b7	95	if (info->be)
8e926134	96	input = be16toh(input);
117cf8b7	97	else
8e926134	98	input = le16toh(input);
117cf8b7	99
d8da0eee PM	100	/*
	101	* Shift before conversion to avoid sign extension
	102	* of left aligned data
	103	*/
1525ecfc	104	input >>= info->shift;
8e926134	105	input &= info->mask;
52615d47	106	if (info->is_signed) {
8e926134 HK	107	int16_t val = (int16_t)(input << (16 - info->bits_used)) >>
	108	(16 - info->bits_used);
	109	printf("%05f ", ((float)val + info->offset) * info->scale);
	110	} else {
	111	printf("%05f ", ((float)input + info->offset) * info->scale);
	112	}
	113	}
ff39a252	114
8e926134 HK	115	void print4byte(uint32_t input, struct iio_channel_info *info)
	116	{
	117	/* First swap if incorrect endian */
	118	if (info->be)
	119	input = be32toh(input);
	120	else
	121	input = le32toh(input);
	122
	123	/*
	124	* Shift before conversion to avoid sign extension
	125	* of left aligned data
	126	*/
	127	input >>= info->shift;
	128	input &= info->mask;
	129	if (info->is_signed) {
	130	int32_t val = (int32_t)(input << (32 - info->bits_used)) >>
	131	(32 - info->bits_used);
	132	printf("%05f ", ((float)val + info->offset) * info->scale);
52615d47	133	} else {
8e926134 HK	134	printf("%05f ", ((float)input + info->offset) * info->scale);
	135	}
	136	}
ff39a252	137
8e926134 HK	138	void print8byte(uint64_t input, struct iio_channel_info *info)
	139	{
	140	/* First swap if incorrect endian */
	141	if (info->be)
	142	input = be64toh(input);
	143	else
	144	input = le64toh(input);
	145
	146	/*
	147	* Shift before conversion to avoid sign extension
	148	* of left aligned data
	149	*/
	150	input >>= info->shift;
	151	input &= info->mask;
	152	if (info->is_signed) {
	153	int64_t val = (int64_t)(input << (64 - info->bits_used)) >>
	154	(64 - info->bits_used);
	155	/* special case for timestamp */
	156	if (info->scale == 1.0f && info->offset == 0.0f)
	157	printf("%" PRId64 " ", val);
	158	else
	159	printf("%05f ",
	160	((float)val + info->offset) * info->scale);
	161	} else {
	162	printf("%05f ", ((float)input + info->offset) * info->scale);
52615d47 JC	163	}
52615d47 JC	164	}
8e926134	165
e58537cc JC	166	/**
	167	* process_scan() - print out the values in SI units
	168	* @data: pointer to the start of the scan
7663a4aa HK	169	* @channels: information about the channels.
	170	* Note: size_from_channelarray must have been called first
	171	* to fill the location offsets.
d8da0eee	172	* @num_channels: number of channels
e58537cc JC	173	**/
e58537cc JC	174	void process_scan(char *data,
d8da0eee	175	struct iio_channel_info *channels,
e58537cc JC	176	int num_channels)
	177	{
	178	int k;
ff39a252	179
e58537cc	180	for (k = 0; k < num_channels; k++)
d8da0eee	181	switch (channels[k].bytes) {
e58537cc	182	/* only a few cases implemented so far */
e8d0927a TB	183	case 1:
	184	print1byte((uint8_t )(data + channels[k].location),
	185	&channels[k]);
	186	break;
e58537cc	187	case 2:
d8da0eee PM	188	print2byte((uint16_t )(data + channels[k].location),
d8da0eee PM	189	&channels[k]);
e58537cc	190	break;
6cffc1f8	191	case 4:
8e926134 HK	192	print4byte((uint32_t )(data + channels[k].location),
8e926134 HK	193	&channels[k]);
6cffc1f8	194	break;
e58537cc	195	case 8:
8e926134 HK	196	print8byte((uint64_t )(data + channels[k].location),
8e926134 HK	197	&channels[k]);
e58537cc JC	198	break;
	199	default:
	200	break;
	201	}
	202	printf("\n");
	203	}
	204
5f991a92 LW	205	static int enable_disable_all_channels(char *dev_dir_name, int enable)
	206	{
	207	const struct dirent *ent;
	208	char scanelemdir[256];
	209	DIR *dp;
	210	int ret;
	211
	212	snprintf(scanelemdir, sizeof(scanelemdir),
	213	FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name);
	214	scanelemdir[sizeof(scanelemdir)-1] = '\0';
	215
	216	dp = opendir(scanelemdir);
	217	if (!dp) {
	218	fprintf(stderr, "Enabling/disabling channels: can't open %s\n",
	219	scanelemdir);
	220	return -EIO;
	221	}
	222
	223	ret = -ENOENT;
	224	while (ent = readdir(dp), ent) {
	225	if (iioutils_check_suffix(ent->d_name, "_en")) {
	226	printf("%sabling: %s\n",
	227	enable ? "En" : "Dis",
	228	ent->d_name);
	229	ret = write_sysfs_int(ent->d_name, scanelemdir,
	230	enable);
	231	if (ret < 0)
	232	fprintf(stderr, "Failed to enable/disable %s\n",
	233	ent->d_name);
	234	}
	235	}
	236
	237	if (closedir(dp) == -1) {
	238	perror("Enabling/disabling channels: "
	239	"Failed to close directory");
	240	return -errno;
	241	}
	242	return 0;
	243	}
	244
e06e3d71 HK	245	void print_usage(void)
e06e3d71 HK	246	{
d9abc615 CO	247	fprintf(stderr, "Usage: generic_buffer [options]...\n"
d9abc615 CO	248	"Capture, convert and output data from IIO device buffer\n"
5f991a92	249	" -a Auto-activate all available channels\n"
d9abc615 CO	250	" -c <n> Do n conversions\n"
	251	" -e Disable wait for event (new data)\n"
	252	" -g Use trigger-less mode\n"
	253	" -l <n> Set buffer length to n samples\n"
de397db8 CDL	254	" --device-name -n <name>\n"
	255	" --device-num -N <num>\n"
	256	" Set device by name or number (mandatory)\n"
7c7e9dad CDL	257	" --trigger-name -t <name>\n"
	258	" --trigger-num -T <num>\n"
	259	" Set trigger by name or number\n"
d9abc615	260	" -w <n> Set delay between reads in us (event-less mode)\n");
e06e3d71 HK	261	}
e06e3d71 HK	262
4f20d592 CDL	263	enum autochan autochannels = AUTOCHANNELS_DISABLED;
	264	char *dev_dir_name = NULL;
	265	char *buf_dir_name = NULL;
	266	bool current_trigger_set = false;
	267
	268	void cleanup(void)
	269	{
	270	int ret;
	271
	272	/* Disable trigger */
	273	if (dev_dir_name && current_trigger_set) {
	274	/* Disconnect the trigger - just write a dummy name. */
	275	ret = write_sysfs_string("trigger/current_trigger",
	276	dev_dir_name, "NULL");
	277	if (ret < 0)
	278	fprintf(stderr, "Failed to disable trigger: %s\n",
	279	strerror(-ret));
	280	current_trigger_set = false;
	281	}
	282
	283	/* Disable buffer */
	284	if (buf_dir_name) {
	285	ret = write_sysfs_int("enable", buf_dir_name, 0);
	286	if (ret < 0)
	287	fprintf(stderr, "Failed to disable buffer: %s\n",
	288	strerror(-ret));
	289	}
	290
	291	/* Disable channels if auto-enabled */
	292	if (dev_dir_name && autochannels == AUTOCHANNELS_ACTIVE) {
	293	ret = enable_disable_all_channels(dev_dir_name, 0);
	294	if (ret)
	295	fprintf(stderr, "Failed to disable all channels\n");
	296	autochannels = AUTOCHANNELS_DISABLED;
	297	}
	298	}
	299
	300	void sig_handler(int signum)
	301	{
	302	fprintf(stderr, "Caught signal %d\n", signum);
	303	cleanup();
	304	exit(-signum);
	305	}
	306
	307	void register_cleanup(void)
	308	{
	309	struct sigaction sa = { .sa_handler = sig_handler };
	310	const int signums[] = { SIGINT, SIGTERM, SIGABRT };
	311	int ret, i;
	312
	313	for (i = 0; i < ARRAY_SIZE(signums); ++i) {
	314	ret = sigaction(signums[i], &sa, NULL);
	315	if (ret) {
	316	perror("Failed to register signal handler");
	317	exit(-1);
	318	}
	319	}
	320	}
	321
de397db8 CDL	322	static const struct option longopts[] = {
	323	{ "device-name", 1, 0, 'n' },
	324	{ "device-num", 1, 0, 'N' },
7c7e9dad CDL	325	{ "trigger-name", 1, 0, 't' },
7c7e9dad CDL	326	{ "trigger-num", 1, 0, 'T' },
de397db8 CDL	327	{ },
	328	};
	329
e58537cc JC	330	int main(int argc, char **argv)
e58537cc JC	331	{
96df9799 JC	332	unsigned long num_loops = 2;
	333	unsigned long timedelay = 1000000;
	334	unsigned long buf_len = 128;
	335
e58537cc	336	int ret, c, i, j, toread;
4f20d592	337	int fp = -1;
e58537cc	338
4f20d592	339	int num_channels = 0;
e58537cc	340	char trigger_name = NULL, device_name = NULL;
e58537cc	341
4f20d592	342	char *data = NULL;
c77b3810	343	ssize_t read_size;
deb4d1fd	344	int dev_num = -1, trig_num = -1;
4f20d592	345	char *buffer_access = NULL;
e58537cc	346	int scan_size;
30268a3d	347	int noevents = 0;
b6d5be57	348	int notrigger = 0;
96df9799	349	char *dummy;
e58537cc	350
ddbc719f	351	struct iio_channel_info *channels = NULL;
e58537cc	352
4f20d592 CDL	353	register_cleanup();
4f20d592 CDL	354
7c7e9dad	355	while ((c = getopt_long(argc, argv, "ac:egl:n:N:t:T:w:", longopts, NULL)) != -1) {
e58537cc	356	switch (c) {
5f991a92 LW	357	case 'a':
	358	autochannels = AUTOCHANNELS_ENABLED;
	359	break;
96df9799	360	case 'c':
c8ce9903	361	errno = 0;
96df9799	362	num_loops = strtoul(optarg, &dummy, 10);
4f20d592 CDL	363	if (errno) {
	364	ret = -errno;
	365	goto error;
	366	}
7663a4aa	367
96df9799	368	break;
e06e3d71 HK	369	case 'e':
	370	noevents = 1;
	371	break;
	372	case 'g':
	373	notrigger = 1;
96df9799 JC	374	break;
96df9799 JC	375	case 'l':
c8ce9903	376	errno = 0;
96df9799	377	buf_len = strtoul(optarg, &dummy, 10);
4f20d592 CDL	378	if (errno) {
	379	ret = -errno;
	380	goto error;
	381	}
7663a4aa	382
96df9799	383	break;
e06e3d71	384	case 'n':
de397db8 CDL	385	device_name = strdup(optarg);
	386	break;
	387	case 'N':
	388	errno = 0;
	389	dev_num = strtoul(optarg, &dummy, 10);
	390	if (errno) {
	391	ret = -errno;
	392	goto error;
	393	}
e06e3d71 HK	394	break;
e06e3d71 HK	395	case 't':
4f20d592	396	trigger_name = strdup(optarg);
e06e3d71	397	break;
7c7e9dad CDL	398	case 'T':
	399	errno = 0;
	400	trig_num = strtoul(optarg, &dummy, 10);
	401	if (errno)
	402	return -errno;
	403	break;
e06e3d71 HK	404	case 'w':
	405	errno = 0;
	406	timedelay = strtoul(optarg, &dummy, 10);
4f20d592 CDL	407	if (errno) {
	408	ret = -errno;
	409	goto error;
	410	}
b6d5be57	411	break;
e58537cc	412	case '?':
e06e3d71	413	print_usage();
4f20d592 CDL	414	ret = -1;
4f20d592 CDL	415	goto error;
e58537cc JC	416	}
	417	}
	418
	419	/* Find the device requested */
de397db8 CDL	420	if (dev_num < 0 && !device_name) {
	421	fprintf(stderr, "Device not set\n");
	422	print_usage();
	423	ret = -1;
	424	goto error;
	425	} else if (dev_num >= 0 && device_name) {
	426	fprintf(stderr, "Only one of --device-num or --device-name needs to be set\n");
	427	print_usage();
	428	ret = -1;
4f20d592	429	goto error;
de397db8 CDL	430	} else if (dev_num < 0) {
	431	dev_num = find_type_by_name(device_name, "iio:device");
	432	if (dev_num < 0) {
	433	fprintf(stderr, "Failed to find the %s\n", device_name);
	434	ret = dev_num;
	435	goto error;
	436	}
e58537cc JC	437	}
	438	printf("iio device number being used is %d\n", dev_num);
	439
e9e45b43	440	ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
de397db8 CDL	441	if (ret < 0)
	442	return -ENOMEM;
	443	/* Fetch device_name if specified by number */
	444	if (!device_name) {
	445	device_name = malloc(IIO_MAX_NAME_LENGTH);
	446	if (!device_name) {
	447	ret = -ENOMEM;
	448	goto error;
	449	}
	450	ret = read_sysfs_string("name", dev_dir_name, device_name);
	451	if (ret < 0) {
	452	fprintf(stderr, "Failed to read name of device %d\n", dev_num);
	453	goto error;
	454	}
4f20d592	455	}
b6d5be57	456
7c7e9dad CDL	457	if (notrigger) {
7c7e9dad CDL	458	printf("trigger-less mode selected\n");
f8e81d7e	459	} else if (trig_num >= 0) {
7c7e9dad CDL	460	char *trig_dev_name;
	461	ret = asprintf(&trig_dev_name, "%strigger%d", iio_dir, trig_num);
	462	if (ret < 0) {
	463	return -ENOMEM;
	464	}
	465	trigger_name = malloc(IIO_MAX_NAME_LENGTH);
	466	ret = read_sysfs_string("name", trig_dev_name, trigger_name);
	467	free(trig_dev_name);
	468	if (ret < 0) {
	469	fprintf(stderr, "Failed to read trigger%d name from\n", trig_num);
	470	return ret;
	471	}
	472	printf("iio trigger number being used is %d\n", trig_num);
	473	} else {
ff1ac639	474	if (!trigger_name) {
b6d5be57 KW	475	/*
	476	* Build the trigger name. If it is device associated
	477	* its name is <device_name>_dev[n] where n matches
	478	* the device number found above.
	479	*/
	480	ret = asprintf(&trigger_name,
	481	"%s-dev%d", device_name, dev_num);
	482	if (ret < 0) {
	483	ret = -ENOMEM;
4f20d592	484	goto error;
b6d5be57	485	}
e58537cc	486	}
e58537cc	487
793d6b5e LW	488	/* Look for this "-devN" trigger */
	489	trig_num = find_type_by_name(trigger_name, "trigger");
	490	if (trig_num < 0) {
	491	/* OK try the simpler "-trigger" suffix instead */
	492	free(trigger_name);
	493	ret = asprintf(&trigger_name,
	494	"%s-trigger", device_name);
	495	if (ret < 0) {
	496	ret = -ENOMEM;
4f20d592	497	goto error;
793d6b5e LW	498	}
	499	}
	500
b6d5be57 KW	501	trig_num = find_type_by_name(trigger_name, "trigger");
b6d5be57 KW	502	if (trig_num < 0) {
d9abc615 CO	503	fprintf(stderr, "Failed to find the trigger %s\n",
d9abc615 CO	504	trigger_name);
e83a47cf	505	ret = trig_num;
4f20d592	506	goto error;
b6d5be57	507	}
7663a4aa	508
b6d5be57	509	printf("iio trigger number being used is %d\n", trig_num);
7663a4aa	510	}
e58537cc JC	511
	512	/*
	513	* Parse the files in scan_elements to identify what channels are
	514	* present
	515	*/
d8da0eee	516	ret = build_channel_array(dev_dir_name, &channels, &num_channels);
e58537cc	517	if (ret) {
d9abc615 CO	518	fprintf(stderr, "Problem reading scan element information\n"
d9abc615 CO	519	"diag %s\n", dev_dir_name);
4f20d592	520	goto error;
e58537cc	521	}
5f991a92 LW	522	if (num_channels && autochannels == AUTOCHANNELS_ENABLED) {
	523	fprintf(stderr, "Auto-channels selected but some channels "
	524	"are already activated in sysfs\n");
	525	fprintf(stderr, "Proceeding without activating any channels\n");
	526	}
	527
	528	if (!num_channels && autochannels == AUTOCHANNELS_ENABLED) {
	529	fprintf(stderr,
	530	"No channels are enabled, enabling all channels\n");
	531
	532	ret = enable_disable_all_channels(dev_dir_name, 1);
	533	if (ret) {
	534	fprintf(stderr, "Failed to enable all channels\n");
4f20d592	535	goto error;
5f991a92 LW	536	}
	537
	538	/* This flags that we need to disable the channels again */
	539	autochannels = AUTOCHANNELS_ACTIVE;
	540
	541	ret = build_channel_array(dev_dir_name, &channels,
	542	&num_channels);
	543	if (ret) {
	544	fprintf(stderr, "Problem reading scan element "
	545	"information\n"
	546	"diag %s\n", dev_dir_name);
4f20d592	547	goto error;
5f991a92 LW	548	}
	549	if (!num_channels) {
	550	fprintf(stderr, "Still no channels after "
	551	"auto-enabling, giving up\n");
4f20d592	552	goto error;
5f991a92 LW	553	}
	554	}
	555
	556	if (!num_channels && autochannels == AUTOCHANNELS_DISABLED) {
53dabafe LW	557	fprintf(stderr,
	558	"No channels are enabled, we have nothing to scan.\n");
	559	fprintf(stderr, "Enable channels manually in "
	560	FORMAT_SCAN_ELEMENTS_DIR
5f991a92 LW	561	"/*_en or pass -a to autoenable channels and "
5f991a92 LW	562	"try again.\n", dev_dir_name);
53dabafe	563	ret = -ENOENT;
4f20d592	564	goto error;
53dabafe	565	}
e58537cc JC	566
	567	/*
	568	* Construct the directory name for the associated buffer.
	569	* As we know that the lis3l02dq has only one buffer this may
	570	* be built rather than found.
	571	*/
1aa04278 JC	572	ret = asprintf(&buf_dir_name,
1aa04278 JC	573	"%siio:device%d/buffer", iio_dir, dev_num);
e58537cc JC	574	if (ret < 0) {
e58537cc JC	575	ret = -ENOMEM;
4f20d592	576	goto error;
e58537cc	577	}
b6d5be57 KW	578
	579	if (!notrigger) {
	580	printf("%s %s\n", dev_dir_name, trigger_name);
7663a4aa HK	581	/*
	582	* Set the device trigger to be the data ready trigger found
	583	* above
	584	*/
b6d5be57 KW	585	ret = write_sysfs_string_and_verify("trigger/current_trigger",
	586	dev_dir_name,
	587	trigger_name);
	588	if (ret < 0) {
d9abc615 CO	589	fprintf(stderr,
d9abc615 CO	590	"Failed to write current_trigger file\n");
4f20d592	591	goto error;
b6d5be57	592	}
e58537cc JC	593	}
	594
	595	/* Setup ring buffer parameters */
	596	ret = write_sysfs_int("length", buf_dir_name, buf_len);
	597	if (ret < 0)
4f20d592	598	goto error;
e58537cc JC	599
	600	/* Enable the buffer */
	601	ret = write_sysfs_int("enable", buf_dir_name, 1);
e7231491 IT	602	if (ret < 0) {
	603	fprintf(stderr,
	604	"Failed to enable buffer: %s\n", strerror(-ret));
4f20d592	605	goto error;
e7231491	606	}
7663a4aa	607
d8da0eee	608	scan_size = size_from_channelarray(channels, num_channels);
7663a4aa	609	data = malloc(scan_size * buf_len);
e58537cc JC	610	if (!data) {
e58537cc JC	611	ret = -ENOMEM;
4f20d592	612	goto error;
e58537cc JC	613	}
e58537cc JC	614
1aa04278	615	ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num);
e58537cc JC	616	if (ret < 0) {
e58537cc JC	617	ret = -ENOMEM;
4f20d592	618	goto error;
e58537cc JC	619	}
e58537cc JC	620
e58537cc JC	621	/* Attempt to open non blocking the access dev */
e58537cc JC	622	fp = open(buffer_access, O_RDONLY \| O_NONBLOCK);
7663a4aa	623	if (fp == -1) { /* TODO: If it isn't there make the node */
e58537cc	624	ret = -errno;
d9abc615	625	fprintf(stderr, "Failed to open %s\n", buffer_access);
4f20d592	626	goto error;
e58537cc JC	627	}
e58537cc JC	628
e58537cc	629	for (j = 0; j < num_loops; j++) {
30268a3d	630	if (!noevents) {
52615d47 JC	631	struct pollfd pfd = {
	632	.fd = fp,
	633	.events = POLLIN,
	634	};
	635
6bb7cac8 HK	636	ret = poll(&pfd, 1, -1);
	637	if (ret < 0) {
	638	ret = -errno;
4f20d592	639	goto error;
6bb7cac8 HK	640	} else if (ret == 0) {
	641	continue;
	642	}
	643
52615d47	644	toread = buf_len;
30268a3d	645	} else {
96df9799	646	usleep(timedelay);
30268a3d	647	toread = 64;
e58537cc	648	}
30268a3d	649
7663a4aa	650	read_size = read(fp, data, toread * scan_size);
97b603a4	651	if (read_size < 0) {
8749948a	652	if (errno == EAGAIN) {
d9abc615	653	fprintf(stderr, "nothing available\n");
97b603a4	654	continue;
7663a4aa	655	} else {
97b603a4	656	break;
7663a4aa	657	}
e58537cc	658	}
7663a4aa HK	659	for (i = 0; i < read_size / scan_size; i++)
7663a4aa HK	660	process_scan(data + scan_size * i, channels,
e58537cc JC	661	num_channels);
	662	}
	663
4f20d592 CDL	664	error:
4f20d592 CDL	665	cleanup();
e58537cc	666
4f20d592	667	if (fp >= 0 && close(fp) == -1)
6bb7cac8	668	perror("Failed to close buffer");
e58537cc	669	free(buffer_access);
a71bfb4a	670	free(data);
e58537cc	671	free(buf_dir_name);
63f05c85 HK	672	for (i = num_channels - 1; i >= 0; i--) {
	673	free(channels[i].name);
	674	free(channels[i].generic_name);
	675	}
	676	free(channels);
4f20d592	677	free(trigger_name);
de397db8	678	free(device_name);
d3ccfc41	679	free(dev_dir_name);
0e799878	680
e58537cc JC	681	return ret;
e58537cc JC	682	}