[linux.git] / tools / spi / spidev_test.c

/*
 * SPI testing utility (using spidev driver)
 *
 * Copyright (c) 2007  MontaVista Software, Inc.
 * Copyright (c) 2007  Anton Vorontsov <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
 */

#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/ioctl.h>
#include <sys/stat.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>

#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))

static void pabort(const char *s)
{
	perror(s);
	abort();
}

static const char *device = "/dev/spidev1.1";
static uint32_t mode;
static uint8_t bits = 8;
static char *input_file;
static char *output_file;
static uint32_t speed = 500000;
static uint16_t delay;
static int verbose;

uint8_t default_tx[] = {
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xF0, 0x0D,
};

uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
char *input_tx;

static void hex_dump(const void *src, size_t length, size_t line_size,
		     char *prefix)
{
	int i = 0;
	const unsigned char *address = src;
	const unsigned char *line = address;
	unsigned char c;

	printf("%s | ", prefix);
	while (length-- > 0) {
		printf("%02X ", *address++);
		if (!(++i % line_size) || (length == 0 && i % line_size)) {
			if (length == 0) {
				while (i++ % line_size)
					printf("__ ");
			}
			printf(" | ");  /* right close */
			while (line < address) {
				c = *line++;
				printf("%c", (c < 33 || c == 255) ? 0x2E : c);
			}
			printf("\n");
			if (length > 0)
				printf("%s | ", prefix);
		}
	}
}

/*
 *  Unescape - process hexadecimal escape character
 *      converts shell input "\x23" -> 0x23
 */
static int unescape(char *_dst, char *_src, size_t len)
{
	int ret = 0;
	int match;
	char *src = _src;
	char *dst = _dst;
	unsigned int ch;

	while (*src) {
		if (*src == '\\' && *(src+1) == 'x') {
			match = sscanf(src + 2, "%2x", &ch);
			if (!match)
				pabort("malformed input string");

			src += 4;
			*dst++ = (unsigned char)ch;
		} else {
			*dst++ = *src++;
		}
		ret++;
	}
	return ret;
}

static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
{
	int ret;
	int out_fd;
	struct spi_ioc_transfer tr = {
		.tx_buf = (unsigned long)tx,
		.rx_buf = (unsigned long)rx,
		.len = len,
		.delay_usecs = delay,
		.speed_hz = speed,
		.bits_per_word = bits,
	};

	if (mode & SPI_TX_QUAD)
		tr.tx_nbits = 4;
	else if (mode & SPI_TX_DUAL)
		tr.tx_nbits = 2;
	if (mode & SPI_RX_QUAD)
		tr.rx_nbits = 4;
	else if (mode & SPI_RX_DUAL)
		tr.rx_nbits = 2;
	if (!(mode & SPI_LOOP)) {
		if (mode & (SPI_TX_QUAD | SPI_TX_DUAL))
			tr.rx_buf = 0;
		else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL))
			tr.tx_buf = 0;
	}

	ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
	if (ret < 1)
		pabort("can't send spi message");

	if (verbose)
		hex_dump(tx, len, 32, "TX");

	if (output_file) {
		out_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
		if (out_fd < 0)
			pabort("could not open output file");

		ret = write(out_fd, rx, len);
		if (ret != len)
			pabort("not all bytes written to output file");

		close(out_fd);
	}

	if (verbose || !output_file)
		hex_dump(rx, len, 32, "RX");
}

static void print_usage(const char *prog)
{
	printf("Usage: %s [-DsbdlHOLC3]\n", prog);
	puts("  -D --device   device to use (default /dev/spidev1.1)\n"
	     "  -s --speed    max speed (Hz)\n"
	     "  -d --delay    delay (usec)\n"
	     "  -b --bpw      bits per word\n"
	     "  -i --input    input data from a file (e.g. \"test.bin\")\n"
	     "  -o --output   output data to a file (e.g. \"results.bin\")\n"
	     "  -l --loop     loopback\n"
	     "  -H --cpha     clock phase\n"
	     "  -O --cpol     clock polarity\n"
	     "  -L --lsb      least significant bit first\n"
	     "  -C --cs-high  chip select active high\n"
	     "  -3 --3wire    SI/SO signals shared\n"
	     "  -v --verbose  Verbose (show tx buffer)\n"
	     "  -p            Send data (e.g. \"1234\\xde\\xad\")\n"
	     "  -N --no-cs    no chip select\n"
	     "  -R --ready    slave pulls low to pause\n"
	     "  -2 --dual     dual transfer\n"
	     "  -4 --quad     quad transfer\n");
	exit(1);
}

static void parse_opts(int argc, char *argv[])
{
	while (1) {
		static const struct option lopts[] = {
			{ "device",  1, 0, 'D' },
			{ "speed",   1, 0, 's' },
			{ "delay",   1, 0, 'd' },
			{ "bpw",     1, 0, 'b' },
			{ "input",   1, 0, 'i' },
			{ "output",  1, 0, 'o' },
			{ "loop",    0, 0, 'l' },
			{ "cpha",    0, 0, 'H' },
			{ "cpol",    0, 0, 'O' },
			{ "lsb",     0, 0, 'L' },
			{ "cs-high", 0, 0, 'C' },
			{ "3wire",   0, 0, '3' },
			{ "no-cs",   0, 0, 'N' },
			{ "ready",   0, 0, 'R' },
			{ "dual",    0, 0, '2' },
			{ "verbose", 0, 0, 'v' },
			{ "quad",    0, 0, '4' },
			{ NULL, 0, 0, 0 },
		};
		int c;

		c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:v",
				lopts, NULL);

		if (c == -1)
			break;

		switch (c) {
		case 'D':
			device = optarg;
			break;
		case 's':
			speed = atoi(optarg);
			break;
		case 'd':
			delay = atoi(optarg);
			break;
		case 'b':
			bits = atoi(optarg);
			break;
		case 'i':
			input_file = optarg;
			break;
		case 'o':
			output_file = optarg;
			break;
		case 'l':
			mode |= SPI_LOOP;
			break;
		case 'H':
			mode |= SPI_CPHA;
			break;
		case 'O':
			mode |= SPI_CPOL;
			break;
		case 'L':
			mode |= SPI_LSB_FIRST;
			break;
		case 'C':
			mode |= SPI_CS_HIGH;
			break;
		case '3':
			mode |= SPI_3WIRE;
			break;
		case 'N':
			mode |= SPI_NO_CS;
			break;
		case 'v':
			verbose = 1;
			break;
		case 'R':
			mode |= SPI_READY;
			break;
		case 'p':
			input_tx = optarg;
			break;
		case '2':
			mode |= SPI_TX_DUAL;
			break;
		case '4':
			mode |= SPI_TX_QUAD;
			break;
		default:
			print_usage(argv[0]);
			break;
		}
	}
	if (mode & SPI_LOOP) {
		if (mode & SPI_TX_DUAL)
			mode |= SPI_RX_DUAL;
		if (mode & SPI_TX_QUAD)
			mode |= SPI_RX_QUAD;
	}
}

static void transfer_escaped_string(int fd, char *str)
{
	size_t size = strlen(str);
	uint8_t *tx;
	uint8_t *rx;

	tx = malloc(size);
	if (!tx)
		pabort("can't allocate tx buffer");

	rx = malloc(size);
	if (!rx)
		pabort("can't allocate rx buffer");

	size = unescape((char *)tx, str, size);
	transfer(fd, tx, rx, size);
	free(rx);
	free(tx);
}

static void transfer_file(int fd, char *filename)
{
	ssize_t bytes;
	struct stat sb;
	int tx_fd;
	uint8_t *tx;
	uint8_t *rx;

	if (stat(filename, &sb) == -1)
		pabort("can't stat input file");

	tx_fd = open(filename, O_RDONLY);
	if (tx_fd < 0)
		pabort("can't open input file");

	tx = malloc(sb.st_size);
	if (!tx)
		pabort("can't allocate tx buffer");

	rx = malloc(sb.st_size);
	if (!rx)
		pabort("can't allocate rx buffer");

	bytes = read(tx_fd, tx, sb.st_size);
	if (bytes != sb.st_size)
		pabort("failed to read input file");

	transfer(fd, tx, rx, sb.st_size);
	free(rx);
	free(tx);
	close(tx_fd);
}

int main(int argc, char *argv[])
{
	int ret = 0;
	int fd;

	parse_opts(argc, argv);

	fd = open(device, O_RDWR);
	if (fd < 0)
		pabort("can't open device");

	/*
	 * spi mode
	 */
	ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
	if (ret == -1)
		pabort("can't set spi mode");

	ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
	if (ret == -1)
		pabort("can't get spi mode");

	/*
	 * bits per word
	 */
	ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
	if (ret == -1)
		pabort("can't set bits per word");

	ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
	if (ret == -1)
		pabort("can't get bits per word");

	/*
	 * max speed hz
	 */
	ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
	if (ret == -1)
		pabort("can't set max speed hz");

	ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
	if (ret == -1)
		pabort("can't get max speed hz");

	printf("spi mode: 0x%x\n", mode);
	printf("bits per word: %d\n", bits);
	printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);

	if (input_tx && input_file)
		pabort("only one of -p and --input may be selected");

	if (input_tx)
		transfer_escaped_string(fd, input_tx);
	else if (input_file)
		transfer_file(fd, input_file);
	else
		transfer(fd, default_tx, default_rx, sizeof(default_tx));

	close(fd);

	return ret;
}
Commit	Line	Data
22b238bd AV	1	/*
	2	* SPI testing utility (using spidev driver)
	3	*
	4	* Copyright (c) 2007 MontaVista Software, Inc.
	5	* Copyright (c) 2007 Anton Vorontsov <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License.
	10	*
	11	* Cross-compile with cross-gcc -I/path/to/cross-kernel/include
	12	*/
	13
	14	#include <stdint.h>
	15	#include <unistd.h>
	16	#include <stdio.h>
	17	#include <stdlib.h>
b78ce7ed	18	#include <string.h>
22b238bd AV	19	#include <getopt.h>
	20	#include <fcntl.h>
	21	#include <sys/ioctl.h>
8736f802	22	#include <linux/ioctl.h>
7af475a5	23	#include <sys/stat.h>
22b238bd AV	24	#include <linux/types.h>
	25	#include <linux/spi/spidev.h>
	26
	27	#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
	28
	29	static void pabort(const char *s)
	30	{
	31	perror(s);
	32	abort();
	33	}
	34
cd58310d	35	static const char *device = "/dev/spidev1.1";
c2e78c34	36	static uint32_t mode;
22b238bd	37	static uint8_t bits = 8;
7af475a5	38	static char *input_file;
983b2788	39	static char *output_file;
22b238bd AV	40	static uint32_t speed = 500000;
22b238bd AV	41	static uint16_t delay;
31a5c5a7	42	static int verbose;
22b238bd	43
30061915 AR	44	uint8_t default_tx[] = {
	45	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	46	0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
	47	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	48	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	49	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	50	0xF0, 0x0D,
	51	};
	52
	53	uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, };
	54	char *input_tx;
	55
b2cfc904 JC	56	static void hex_dump(const void *src, size_t length, size_t line_size,
b2cfc904 JC	57	char *prefix)
b78ce7ed AR	58	{
	59	int i = 0;
	60	const unsigned char *address = src;
	61	const unsigned char *line = address;
	62	unsigned char c;
	63
	64	printf("%s \| ", prefix);
	65	while (length-- > 0) {
	66	printf("%02X ", *address++);
	67	if (!(++i % line_size) \|\| (length == 0 && i % line_size)) {
	68	if (length == 0) {
	69	while (i++ % line_size)
	70	printf("__ ");
	71	}
	72	printf(" \| "); /* right close */
	73	while (line < address) {
	74	c = *line++;
	75	printf("%c", (c < 33 \|\| c == 255) ? 0x2E : c);
	76	}
	77	printf("\n");
	78	if (length > 0)
	79	printf("%s \| ", prefix);
	80	}
	81	}
	82	}
	83
30061915 AR	84	/*
	85	* Unescape - process hexadecimal escape character
	86	* converts shell input "\x23" -> 0x23
	87	*/
07eec628	88	static int unescape(char _dst, char _src, size_t len)
30061915 AR	89	{
30061915 AR	90	int ret = 0;
a20874f7	91	int match;
30061915 AR	92	char *src = _src;
	93	char *dst = _dst;
	94	unsigned int ch;
	95
	96	while (*src) {
	97	if (src == '\\' && (src+1) == 'x') {
a20874f7 JC	98	match = sscanf(src + 2, "%2x", &ch);
	99	if (!match)
	100	pabort("malformed input string");
	101
30061915 AR	102	src += 4;
	103	*dst++ = (unsigned char)ch;
	104	} else {
	105	dst++ = src++;
	106	}
	107	ret++;
	108	}
	109	return ret;
	110	}
	111
	112	static void transfer(int fd, uint8_t const tx, uint8_t const rx, size_t len)
22b238bd AV	113	{
22b238bd AV	114	int ret;
983b2788	115	int out_fd;
22b238bd AV	116	struct spi_ioc_transfer tr = {
	117	.tx_buf = (unsigned long)tx,
	118	.rx_buf = (unsigned long)rx,
30061915	119	.len = len,
22b238bd AV	120	.delay_usecs = delay,
	121	.speed_hz = speed,
	122	.bits_per_word = bits,
	123	};
	124
c2e78c34 GU	125	if (mode & SPI_TX_QUAD)
	126	tr.tx_nbits = 4;
	127	else if (mode & SPI_TX_DUAL)
	128	tr.tx_nbits = 2;
	129	if (mode & SPI_RX_QUAD)
	130	tr.rx_nbits = 4;
	131	else if (mode & SPI_RX_DUAL)
	132	tr.rx_nbits = 2;
	133	if (!(mode & SPI_LOOP)) {
	134	if (mode & (SPI_TX_QUAD \| SPI_TX_DUAL))
	135	tr.rx_buf = 0;
	136	else if (mode & (SPI_RX_QUAD \| SPI_RX_DUAL))
	137	tr.tx_buf = 0;
	138	}
	139
22b238bd	140	ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
95b1ed2a	141	if (ret < 1)
22b238bd AV	142	pabort("can't send spi message");
22b238bd AV	143
31a5c5a7	144	if (verbose)
30061915	145	hex_dump(tx, len, 32, "TX");
983b2788 JC	146
	147	if (output_file) {
	148	out_fd = open(output_file, O_WRONLY \| O_CREAT \| O_TRUNC, 0666);
	149	if (out_fd < 0)
	150	pabort("could not open output file");
	151
	152	ret = write(out_fd, rx, len);
	153	if (ret != len)
edd3899c	154	pabort("not all bytes written to output file");
983b2788 JC	155
	156	close(out_fd);
	157	}
	158
	159	if (verbose \|\| !output_file)
	160	hex_dump(rx, len, 32, "RX");
22b238bd AV	161	}
22b238bd AV	162
b7ed698c	163	static void print_usage(const char *prog)
22b238bd AV	164	{
	165	printf("Usage: %s [-DsbdlHOLC3]\n", prog);
	166	puts(" -D --device device to use (default /dev/spidev1.1)\n"
	167	" -s --speed max speed (Hz)\n"
	168	" -d --delay delay (usec)\n"
b2cfc904	169	" -b --bpw bits per word\n"
7af475a5	170	" -i --input input data from a file (e.g. \"test.bin\")\n"
983b2788	171	" -o --output output data to a file (e.g. \"results.bin\")\n"
22b238bd AV	172	" -l --loop loopback\n"
	173	" -H --cpha clock phase\n"
	174	" -O --cpol clock polarity\n"
	175	" -L --lsb least significant bit first\n"
	176	" -C --cs-high chip select active high\n"
925d16a2	177	" -3 --3wire SI/SO signals shared\n"
31a5c5a7	178	" -v --verbose Verbose (show tx buffer)\n"
30061915	179	" -p Send data (e.g. \"1234\\xde\\xad\")\n"
925d16a2	180	" -N --no-cs no chip select\n"
c2e78c34 GU	181	" -R --ready slave pulls low to pause\n"
	182	" -2 --dual dual transfer\n"
	183	" -4 --quad quad transfer\n");
22b238bd AV	184	exit(1);
	185	}
	186
b7ed698c	187	static void parse_opts(int argc, char *argv[])
22b238bd AV	188	{
22b238bd AV	189	while (1) {
cd58310d	190	static const struct option lopts[] = {
22b238bd AV	191	{ "device", 1, 0, 'D' },
	192	{ "speed", 1, 0, 's' },
	193	{ "delay", 1, 0, 'd' },
	194	{ "bpw", 1, 0, 'b' },
7af475a5	195	{ "input", 1, 0, 'i' },
983b2788	196	{ "output", 1, 0, 'o' },
22b238bd AV	197	{ "loop", 0, 0, 'l' },
	198	{ "cpha", 0, 0, 'H' },
	199	{ "cpol", 0, 0, 'O' },
	200	{ "lsb", 0, 0, 'L' },
	201	{ "cs-high", 0, 0, 'C' },
	202	{ "3wire", 0, 0, '3' },
b55f627f DB	203	{ "no-cs", 0, 0, 'N' },
b55f627f DB	204	{ "ready", 0, 0, 'R' },
c2e78c34	205	{ "dual", 0, 0, '2' },
31a5c5a7	206	{ "verbose", 0, 0, 'v' },
c2e78c34	207	{ "quad", 0, 0, '4' },
22b238bd AV	208	{ NULL, 0, 0, 0 },
	209	};
	210	int c;
	211
983b2788	212	c = getopt_long(argc, argv, "D:s:d:b:i:o:lHOLC3NR24p:v",
7af475a5	213	lopts, NULL);
22b238bd AV	214
	215	if (c == -1)
	216	break;
	217
	218	switch (c) {
	219	case 'D':
	220	device = optarg;
	221	break;
	222	case 's':
	223	speed = atoi(optarg);
	224	break;
	225	case 'd':
	226	delay = atoi(optarg);
	227	break;
	228	case 'b':
	229	bits = atoi(optarg);
	230	break;
7af475a5 JC	231	case 'i':
	232	input_file = optarg;
	233	break;
983b2788 JC	234	case 'o':
	235	output_file = optarg;
	236	break;
22b238bd AV	237	case 'l':
	238	mode \|= SPI_LOOP;
	239	break;
	240	case 'H':
	241	mode \|= SPI_CPHA;
	242	break;
	243	case 'O':
	244	mode \|= SPI_CPOL;
	245	break;
	246	case 'L':
	247	mode \|= SPI_LSB_FIRST;
	248	break;
	249	case 'C':
	250	mode \|= SPI_CS_HIGH;
	251	break;
	252	case '3':
	253	mode \|= SPI_3WIRE;
	254	break;
b55f627f DB	255	case 'N':
	256	mode \|= SPI_NO_CS;
	257	break;
31a5c5a7 AR	258	case 'v':
	259	verbose = 1;
	260	break;
b55f627f DB	261	case 'R':
	262	mode \|= SPI_READY;
	263	break;
30061915 AR	264	case 'p':
	265	input_tx = optarg;
	266	break;
c2e78c34 GU	267	case '2':
	268	mode \|= SPI_TX_DUAL;
	269	break;
	270	case '4':
	271	mode \|= SPI_TX_QUAD;
	272	break;
22b238bd AV	273	default:
	274	print_usage(argv[0]);
	275	break;
	276	}
	277	}
c2e78c34 GU	278	if (mode & SPI_LOOP) {
	279	if (mode & SPI_TX_DUAL)
	280	mode \|= SPI_RX_DUAL;
	281	if (mode & SPI_TX_QUAD)
	282	mode \|= SPI_RX_QUAD;
	283	}
22b238bd AV	284	}
22b238bd AV	285
5c437a40 JC	286	static void transfer_escaped_string(int fd, char *str)
5c437a40 JC	287	{
0278b34b	288	size_t size = strlen(str);
5c437a40 JC	289	uint8_t *tx;
	290	uint8_t *rx;
	291
	292	tx = malloc(size);
	293	if (!tx)
	294	pabort("can't allocate tx buffer");
	295
	296	rx = malloc(size);
	297	if (!rx)
	298	pabort("can't allocate rx buffer");
	299
	300	size = unescape((char *)tx, str, size);
	301	transfer(fd, tx, rx, size);
	302	free(rx);
	303	free(tx);
	304	}
	305
7af475a5 JC	306	static void transfer_file(int fd, char *filename)
	307	{
	308	ssize_t bytes;
	309	struct stat sb;
	310	int tx_fd;
	311	uint8_t *tx;
	312	uint8_t *rx;
	313
	314	if (stat(filename, &sb) == -1)
	315	pabort("can't stat input file");
	316
	317	tx_fd = open(filename, O_RDONLY);
e634b76c	318	if (tx_fd < 0)
7af475a5 JC	319	pabort("can't open input file");
	320
	321	tx = malloc(sb.st_size);
	322	if (!tx)
	323	pabort("can't allocate tx buffer");
	324
	325	rx = malloc(sb.st_size);
	326	if (!rx)
	327	pabort("can't allocate rx buffer");
	328
	329	bytes = read(tx_fd, tx, sb.st_size);
	330	if (bytes != sb.st_size)
	331	pabort("failed to read input file");
	332
	333	transfer(fd, tx, rx, sb.st_size);
	334	free(rx);
	335	free(tx);
	336	close(tx_fd);
	337	}
	338
22b238bd AV	339	int main(int argc, char *argv[])
	340	{
	341	int ret = 0;
	342	int fd;
	343
	344	parse_opts(argc, argv);
	345
	346	fd = open(device, O_RDWR);
	347	if (fd < 0)
	348	pabort("can't open device");
	349
	350	/*
	351	* spi mode
	352	*/
c2e78c34	353	ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
22b238bd AV	354	if (ret == -1)
	355	pabort("can't set spi mode");
	356
c2e78c34	357	ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
22b238bd AV	358	if (ret == -1)
	359	pabort("can't get spi mode");
	360
	361	/*
	362	* bits per word
	363	*/
	364	ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
	365	if (ret == -1)
	366	pabort("can't set bits per word");
	367
	368	ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
	369	if (ret == -1)
	370	pabort("can't get bits per word");
	371
	372	/*
	373	* max speed hz
	374	*/
	375	ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
	376	if (ret == -1)
	377	pabort("can't set max speed hz");
	378
	379	ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
	380	if (ret == -1)
	381	pabort("can't get max speed hz");
	382
c2e78c34	383	printf("spi mode: 0x%x\n", mode);
22b238bd AV	384	printf("bits per word: %d\n", bits);
	385	printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000);
	386
7af475a5 JC	387	if (input_tx && input_file)
	388	pabort("only one of -p and --input may be selected");
	389
5c437a40 JC	390	if (input_tx)
5c437a40 JC	391	transfer_escaped_string(fd, input_tx);
7af475a5 JC	392	else if (input_file)
7af475a5 JC	393	transfer_file(fd, input_file);
5c437a40	394	else
30061915	395	transfer(fd, default_tx, default_rx, sizeof(default_tx));
22b238bd AV	396
	397	close(fd);
	398
	399	return ret;
	400	}