Extract the '-a' mode into a separate function, and simplify the hexdumping logic. Dont call usage() without telling why.
762 lines
17 KiB
C
762 lines
17 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2008-2009 Semihalf, Michal Hajduk and Bartlomiej Sieka
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <sysexits.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/endian.h>
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#include <sys/ioctl.h>
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#include <dev/iicbus/iic.h>
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#define I2C_DEV "/dev/iic0"
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#define I2C_MODE_NOTSET 0
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#define I2C_MODE_NONE 1
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#define I2C_MODE_STOP_START 2
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#define I2C_MODE_REPEATED_START 3
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#define I2C_MODE_TRANSFER 4
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struct options {
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const char *width;
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int count;
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int verbose;
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int addr_set;
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int binary;
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int scan;
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int skip;
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int reset;
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int mode;
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char dir;
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uint32_t addr;
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uint32_t off;
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uint8_t off_buf[2];
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size_t off_len;
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};
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struct skip_range {
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int start;
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int end;
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};
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__dead2 static void
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usage(const char *msg)
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{
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if (msg != NULL)
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fprintf(stderr, "%s\n", msg);
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fprintf(stderr, "usage: %s -a addr [-f device] [-d [r|w]] [-o offset] "
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"[-w [0|8|16]] [-c count] [-m [tr|ss|rs|no]] [-b] [-v]\n",
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getprogname());
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fprintf(stderr, " %s -s [-f device] [-n skip_addr] -v\n",
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getprogname());
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fprintf(stderr, " %s -r [-f device] -v\n", getprogname());
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exit(EX_USAGE);
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}
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static struct skip_range
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skip_get_range(char *skip_addr)
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{
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struct skip_range addr_range;
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char *token;
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addr_range.start = 0;
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addr_range.end = 0;
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token = strsep(&skip_addr, "..");
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if (token) {
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addr_range.start = strtoul(token, 0, 16);
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token = strsep(&skip_addr, "..");
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if ((token != NULL) && !atoi(token)) {
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token = strsep(&skip_addr, "..");
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if (token)
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addr_range.end = strtoul(token, 0, 16);
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}
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}
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return (addr_range);
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}
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/* Parse the string to get hex 7 bits addresses */
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static int
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skip_get_tokens(char *skip_addr, int *sk_addr, int max_index)
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{
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char *token;
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int i;
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for (i = 0; i < max_index; i++) {
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token = strsep(&skip_addr, ":");
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if (token == NULL)
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break;
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sk_addr[i] = strtoul(token, 0, 16);
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}
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return (i);
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}
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static int
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scan_bus(const char *dev, int fd, int skip, char *skip_addr)
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{
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struct iiccmd cmd;
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struct iic_msg rdmsg;
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struct iic_rdwr_data rdwrdata;
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struct skip_range addr_range = { 0, 0 };
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int *tokens = NULL, error, i, idx = 0, j;
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int len = 0, do_skip = 0, no_range = 1, num_found = 0, use_read_xfer = 0;
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uint8_t rdbyte;
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if (skip) {
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assert(skip_addr != NULL);
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len = strlen(skip_addr);
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if (strstr(skip_addr, "..") != NULL) {
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addr_range = skip_get_range(skip_addr);
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no_range = 0;
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} else {
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tokens = (int *)malloc((len / 2 + 1) * sizeof(int));
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if (tokens == NULL) {
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fprintf(stderr, "Error allocating tokens "
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"buffer\n");
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error = -1;
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goto out;
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}
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idx = skip_get_tokens(skip_addr, tokens,
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len / 2 + 1);
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}
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if (!no_range && (addr_range.start > addr_range.end)) {
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fprintf(stderr, "Skip address out of range\n");
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error = -1;
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goto out;
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}
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}
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printf("Scanning I2C devices on %s: ", dev);
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start_over:
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if (use_read_xfer) {
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fprintf(stderr,
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"Hardware may not support START/STOP scanning; "
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"trying less-reliable read method.\n");
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}
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for (i = 1; i < 127; i++) {
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if (skip && ( addr_range.start < addr_range.end)) {
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if (i >= addr_range.start && i <= addr_range.end)
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continue;
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} else if (skip && no_range) {
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assert (tokens != NULL);
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for (j = 0; j < idx; j++) {
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if (tokens[j] == i) {
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do_skip = 1;
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break;
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}
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}
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}
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if (do_skip) {
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do_skip = 0;
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continue;
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}
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cmd.slave = i << 1;
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cmd.last = 1;
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cmd.count = 0;
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error = ioctl(fd, I2CRSTCARD, &cmd);
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if (error) {
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fprintf(stderr, "Controller reset failed\n");
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goto out;
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}
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if (use_read_xfer) {
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rdmsg.buf = &rdbyte;
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rdmsg.len = 1;
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rdmsg.flags = IIC_M_RD;
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rdmsg.slave = i << 1;
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rdwrdata.msgs = &rdmsg;
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rdwrdata.nmsgs = 1;
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error = ioctl(fd, I2CRDWR, &rdwrdata);
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} else {
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cmd.slave = i << 1;
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cmd.last = 1;
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error = ioctl(fd, I2CSTART, &cmd);
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if (errno == ENODEV || errno == EOPNOTSUPP) {
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/* If START not supported try reading. */
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use_read_xfer = 1;
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goto start_over;
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}
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(void)ioctl(fd, I2CSTOP);
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}
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if (error == 0) {
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++num_found;
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printf("%02x ", i);
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}
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}
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/*
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* If we found nothing, maybe START is not supported and returns a
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* generic error code such as EIO or ENXIO, so try again using reads.
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*/
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if (num_found == 0) {
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if (!use_read_xfer) {
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use_read_xfer = 1;
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goto start_over;
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}
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printf("<none found>");
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}
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printf("\n");
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error = ioctl(fd, I2CRSTCARD, &cmd);
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out:
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if (skip && no_range)
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free(tokens);
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else
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assert(tokens == NULL);
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if (error) {
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fprintf(stderr, "Error scanning I2C controller (%s): %s\n",
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dev, strerror(errno));
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return (EX_NOINPUT);
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} else
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return (EX_OK);
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}
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static int
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reset_bus(const char *dev, int fd)
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{
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struct iiccmd cmd;
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int error;
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printf("Resetting I2C controller on %s: ", dev);
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error = ioctl(fd, I2CRSTCARD, &cmd);
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if (error) {
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printf("error: %s\n", strerror(errno));
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return (EX_IOERR);
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} else {
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printf("OK\n");
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return (EX_OK);
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}
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}
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static const char *
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encode_offset(const char *width, unsigned address, uint8_t *dst, size_t *len)
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{
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if (!strcmp(width, "0")) {
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*len = 0;
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return (NULL);
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}
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if (!strcmp(width, "8")) {
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if (address > 0xff)
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return ("Invalid 8-bit address\n");
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*dst = address;
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*len = 1;
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return (NULL);
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}
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if (address > 0xffff)
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return ("Invalid 16-bit address\n");
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if (!strcmp(width, "16LE") || !strcmp(width, "16")) {
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le16enc(dst, address);
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*len = 2;
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return (NULL);
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}
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if (!strcmp(width, "16BE")) {
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be16enc(dst, address);
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*len = 2;
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return (NULL);
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}
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return ("Invalid offset width, must be: 0|8|16|16LE|16BE\n");
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}
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static const char *
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write_offset(int fd, struct options i2c_opt, struct iiccmd *cmd)
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{
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int error;
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if (i2c_opt.off_len > 0) {
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cmd->count = i2c_opt.off_len;
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cmd->buf = i2c_opt.off_buf;
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error = ioctl(fd, I2CWRITE, cmd);
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if (error == -1)
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return ("ioctl: error writing offset\n");
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}
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return (NULL);
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}
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static int
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i2c_write(int fd, struct options i2c_opt, char *i2c_buf)
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{
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struct iiccmd cmd;
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int error;
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char *buf;
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const char *err_msg;
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CSTART, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error sending start condition";
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goto err1;
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}
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switch(i2c_opt.mode) {
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case I2C_MODE_STOP_START:
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err_msg = write_offset(fd, i2c_opt, &cmd);
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if (err_msg != NULL)
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goto err1;
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error = ioctl(fd, I2CSTOP);
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if (error == -1) {
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err_msg = "ioctl: error sending stop condition";
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goto err2;
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}
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CSTART, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error sending start condition";
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goto err1;
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}
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/*
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* Write the data
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*/
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cmd.count = i2c_opt.count;
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cmd.buf = i2c_buf;
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cmd.last = 0;
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error = ioctl(fd, I2CWRITE, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error writing";
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goto err1;
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}
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break;
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case I2C_MODE_REPEATED_START:
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err_msg = write_offset(fd, i2c_opt, &cmd);
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if (err_msg != NULL)
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goto err1;
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CRPTSTART, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error sending repeated start "
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"condition";
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goto err1;
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}
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/*
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* Write the data
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*/
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cmd.count = i2c_opt.count;
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cmd.buf = i2c_buf;
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cmd.last = 0;
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error = ioctl(fd, I2CWRITE, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error writing";
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goto err1;
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}
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break;
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case I2C_MODE_NONE: /* fall through */
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default:
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buf = malloc(i2c_opt.off_len + i2c_opt.count);
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if (buf == NULL) {
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err_msg = "error: data malloc";
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goto err1;
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}
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memcpy(buf, i2c_opt.off_buf, i2c_opt.off_len);
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memcpy(buf + i2c_opt.off_len, i2c_buf, i2c_opt.count);
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/*
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* Write offset and data
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*/
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cmd.count = i2c_opt.off_len + i2c_opt.count;
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cmd.buf = buf;
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cmd.last = 0;
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error = ioctl(fd, I2CWRITE, &cmd);
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free(buf);
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if (error == -1) {
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err_msg = "ioctl: error writing";
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goto err1;
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}
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break;
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}
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error = ioctl(fd, I2CSTOP);
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if (error == -1) {
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err_msg = "ioctl: error sending stop condition";
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goto err2;
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}
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return (0);
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err1:
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error = ioctl(fd, I2CSTOP);
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if (error == -1)
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fprintf(stderr, "error sending stop condition\n");
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err2:
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if (err_msg)
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fprintf(stderr, "%s\n", err_msg);
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return (1);
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}
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static int
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i2c_read(int fd, struct options i2c_opt, char *i2c_buf)
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{
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struct iiccmd cmd;
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int error;
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char data = 0;
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const char *err_msg;
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bzero(&cmd, sizeof(cmd));
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if (i2c_opt.off_len) {
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cmd.slave = i2c_opt.addr;
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cmd.count = 1;
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cmd.last = 0;
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cmd.buf = &data;
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error = ioctl(fd, I2CSTART, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error sending start condition";
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goto err1;
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}
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err_msg = write_offset(fd, i2c_opt, &cmd);
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if (err_msg != NULL)
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goto err1;
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if (i2c_opt.mode == I2C_MODE_STOP_START) {
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error = ioctl(fd, I2CSTOP);
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if (error == -1) {
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err_msg = "error sending stop condition";
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goto err2;
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}
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}
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}
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cmd.slave = i2c_opt.addr | 1;
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cmd.count = 1;
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cmd.last = 0;
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cmd.buf = &data;
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if (i2c_opt.mode == I2C_MODE_STOP_START || i2c_opt.off_len == 0) {
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error = ioctl(fd, I2CSTART, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error sending start condition";
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goto err2;
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}
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} else if (i2c_opt.mode == I2C_MODE_REPEATED_START) {
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error = ioctl(fd, I2CRPTSTART, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error sending repeated start "
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"condition";
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goto err1;
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}
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}
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cmd.count = i2c_opt.count;
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cmd.buf = i2c_buf;
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cmd.last = 1;
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error = ioctl(fd, I2CREAD, &cmd);
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if (error == -1) {
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err_msg = "ioctl: error while reading";
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goto err1;
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}
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error = ioctl(fd, I2CSTOP);
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if (error == -1) {
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err_msg = "error sending stop condtion\n";
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goto err2;
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}
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return (0);
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err1:
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error = ioctl(fd, I2CSTOP);
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if (error == -1)
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fprintf(stderr, "error sending stop condition\n");
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err2:
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if (err_msg)
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fprintf(stderr, "%s\n", err_msg);
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return (1);
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}
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/*
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* i2c_rdwr_transfer() - use I2CRDWR to conduct a complete i2c transfer.
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*
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* Some i2c hardware is unable to provide direct control over START, REPEAT-
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* START, and STOP operations. Such hardware can only perform a complete
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* START-<data>-STOP or START-<data>-REPEAT-START-<data>-STOP sequence as a
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* single operation. The driver framework refers to this sequence as a
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* "transfer" so we call it "transfer mode". We assemble either one or two
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* iic_msg structures to describe the IO operations, and hand them off to the
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* driver to be handled as a single transfer.
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*/
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static int
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i2c_rdwr_transfer(int fd, struct options i2c_opt, char *i2c_buf)
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{
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struct iic_msg msgs[2], *msgp = msgs;
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struct iic_rdwr_data xfer;
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int flag = 0;
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if (i2c_opt.off_len) {
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msgp->flags = IIC_M_WR | IIC_M_NOSTOP;
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msgp->slave = i2c_opt.addr;
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msgp->buf = i2c_opt.off_buf;
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msgp->len = i2c_opt.off_len;
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msgp++;
|
|
flag = IIC_M_NOSTART;
|
|
}
|
|
|
|
/*
|
|
* If the transfer direction is write and we did a write of the offset
|
|
* above, then we need to elide the start; this transfer is just more
|
|
* writing that follows the one started above. For a read, we always do
|
|
* a start; if we did an offset write above it'll be a repeat-start
|
|
* because of the NOSTOP flag used above.
|
|
*/
|
|
if (i2c_opt.dir == 'w')
|
|
msgp->flags = IIC_M_WR | flag;
|
|
else
|
|
msgp->flags = IIC_M_RD;
|
|
msgp->slave = i2c_opt.addr;
|
|
msgp->len = i2c_opt.count;
|
|
msgp->buf = i2c_buf;
|
|
msgp++;
|
|
|
|
xfer.msgs = msgs;
|
|
xfer.nmsgs = msgp - msgs;
|
|
|
|
if (ioctl(fd, I2CRDWR, &xfer) == -1 )
|
|
err(1, "ioctl(I2CRDWR) failed");
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
access_bus(int fd, struct options i2c_opt)
|
|
{
|
|
char *i2c_buf;
|
|
int error, chunk_size = 16, i, ch;
|
|
|
|
i2c_buf = malloc(i2c_opt.count);
|
|
if (i2c_buf == NULL)
|
|
err(1, "data malloc");
|
|
|
|
/*
|
|
* For a write, read the data to be written to the chip from stdin.
|
|
*/
|
|
if (i2c_opt.dir == 'w') {
|
|
if (i2c_opt.verbose && !i2c_opt.binary)
|
|
fprintf(stderr, "Enter %d bytes of data: ",
|
|
i2c_opt.count);
|
|
for (i = 0; i < i2c_opt.count; i++) {
|
|
ch = getchar();
|
|
if (ch == EOF) {
|
|
free(i2c_buf);
|
|
err(1, "not enough data, exiting\n");
|
|
}
|
|
i2c_buf[i] = ch;
|
|
}
|
|
}
|
|
|
|
if (i2c_opt.mode == I2C_MODE_TRANSFER)
|
|
error = i2c_rdwr_transfer(fd, i2c_opt, i2c_buf);
|
|
else if (i2c_opt.dir == 'w')
|
|
error = i2c_write(fd, i2c_opt, i2c_buf);
|
|
else
|
|
error = i2c_read(fd, i2c_opt, i2c_buf);
|
|
|
|
if (error == 0) {
|
|
if (i2c_opt.dir == 'r' && i2c_opt.binary) {
|
|
(void)fwrite(i2c_buf, 1, i2c_opt.count, stdout);
|
|
} else if (i2c_opt.verbose || i2c_opt.dir == 'r') {
|
|
if (i2c_opt.verbose)
|
|
fprintf(stderr, "\nData %s (hex):\n",
|
|
i2c_opt.dir == 'r' ? "read" : "written");
|
|
|
|
for (i = 0; i < i2c_opt.count; i++) {
|
|
fprintf (stderr, "%02hhx ", i2c_buf[i]);
|
|
if ((i % chunk_size) == chunk_size - 1)
|
|
fprintf(stderr, "\n");
|
|
}
|
|
if ((i % chunk_size) != 0)
|
|
fprintf(stderr, "\n");
|
|
}
|
|
}
|
|
|
|
free(i2c_buf);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
main(int argc, char** argv)
|
|
{
|
|
struct options i2c_opt;
|
|
char *skip_addr = NULL;
|
|
const char *dev, *err_msg;
|
|
int fd, error, ch;
|
|
|
|
errno = 0;
|
|
|
|
dev = I2C_DEV;
|
|
|
|
/* Default values */
|
|
i2c_opt.addr_set = 0;
|
|
i2c_opt.off = 0;
|
|
i2c_opt.verbose = 0;
|
|
i2c_opt.dir = 'r'; /* direction = read */
|
|
i2c_opt.width = "8";
|
|
i2c_opt.count = 1;
|
|
i2c_opt.binary = 0; /* ASCII text output */
|
|
i2c_opt.scan = 0; /* no bus scan */
|
|
i2c_opt.skip = 0; /* scan all addresses */
|
|
i2c_opt.reset = 0; /* no bus reset */
|
|
i2c_opt.mode = I2C_MODE_NOTSET;
|
|
|
|
while ((ch = getopt(argc, argv, "a:f:d:o:w:c:m:n:sbvrh")) != -1) {
|
|
switch(ch) {
|
|
case 'a':
|
|
i2c_opt.addr = (strtoul(optarg, 0, 16) << 1);
|
|
if (i2c_opt.addr == 0 && errno == EINVAL)
|
|
usage("Bad -a argument (hex)");
|
|
i2c_opt.addr_set = 1;
|
|
break;
|
|
case 'f':
|
|
dev = optarg;
|
|
break;
|
|
case 'd':
|
|
i2c_opt.dir = optarg[0];
|
|
break;
|
|
case 'o':
|
|
i2c_opt.off = strtoul(optarg, 0, 16);
|
|
if (i2c_opt.off == 0 && errno == EINVAL)
|
|
usage("Bad -o argument (hex)");
|
|
break;
|
|
case 'w':
|
|
i2c_opt.width = optarg;
|
|
break;
|
|
case 'c':
|
|
i2c_opt.count = (strtoul(optarg, 0, 10));
|
|
if (i2c_opt.count == 0 && errno == EINVAL)
|
|
usage("Bad -c argument (decimal)");
|
|
break;
|
|
case 'm':
|
|
if (!strcmp(optarg, "no"))
|
|
i2c_opt.mode = I2C_MODE_NONE;
|
|
else if (!strcmp(optarg, "ss"))
|
|
i2c_opt.mode = I2C_MODE_STOP_START;
|
|
else if (!strcmp(optarg, "rs"))
|
|
i2c_opt.mode = I2C_MODE_REPEATED_START;
|
|
else if (!strcmp(optarg, "tr"))
|
|
i2c_opt.mode = I2C_MODE_TRANSFER;
|
|
else
|
|
usage("Bad -m argument ([no|ss|rs|tr])");
|
|
break;
|
|
case 'n':
|
|
i2c_opt.skip = 1;
|
|
skip_addr = optarg;
|
|
break;
|
|
case 's':
|
|
i2c_opt.scan = 1;
|
|
break;
|
|
case 'b':
|
|
i2c_opt.binary = 1;
|
|
break;
|
|
case 'v':
|
|
i2c_opt.verbose = 1;
|
|
break;
|
|
case 'r':
|
|
i2c_opt.reset = 1;
|
|
break;
|
|
case 'h':
|
|
usage("Help:");
|
|
break;
|
|
default:
|
|
usage("Bad argument");
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc > 0)
|
|
usage("Too many arguments");
|
|
|
|
/* Set default mode if option -m is not specified */
|
|
if (i2c_opt.mode == I2C_MODE_NOTSET) {
|
|
if (i2c_opt.dir == 'r')
|
|
i2c_opt.mode = I2C_MODE_STOP_START;
|
|
else if (i2c_opt.dir == 'w')
|
|
i2c_opt.mode = I2C_MODE_NONE;
|
|
}
|
|
|
|
err_msg = encode_offset(i2c_opt.width, i2c_opt.off,
|
|
i2c_opt.off_buf, &i2c_opt.off_len);
|
|
if (err_msg != NULL) {
|
|
fprintf(stderr, "%s", err_msg);
|
|
exit(EX_USAGE);
|
|
}
|
|
|
|
/* Basic sanity check of command line arguments */
|
|
if (i2c_opt.scan) {
|
|
if (i2c_opt.addr_set)
|
|
usage("-s and -a are incompatible");
|
|
} else if (i2c_opt.reset) {
|
|
if (i2c_opt.addr_set)
|
|
usage("-r and -a are incompatible");
|
|
}
|
|
|
|
if (i2c_opt.verbose)
|
|
fprintf(stderr, "dev: %s, addr: 0x%x, r/w: %c, "
|
|
"offset: 0x%02x, width: %s, count: %d\n", dev,
|
|
i2c_opt.addr >> 1, i2c_opt.dir, i2c_opt.off,
|
|
i2c_opt.width, i2c_opt.count);
|
|
|
|
fd = open(dev, O_RDWR);
|
|
if (fd == -1) {
|
|
fprintf(stderr, "Error opening I2C controller (%s): %s\n",
|
|
dev, strerror(errno));
|
|
return (EX_NOINPUT);
|
|
}
|
|
|
|
if (i2c_opt.scan)
|
|
error = scan_bus(dev, fd, i2c_opt.skip, skip_addr);
|
|
else if (i2c_opt.reset)
|
|
error = reset_bus(dev, fd);
|
|
else
|
|
error = access_bus(fd, i2c_opt);
|
|
|
|
ch = close(fd);
|
|
assert(ch == 0);
|
|
return (error);
|
|
}
|