3f028229d9
error: variable 'i2c' set but not used Approved by: dim, cperciva (mentor, blanket for pre-mentorship already-approved commits) MFC after: 3 days
633 lines
13 KiB
C
633 lines
13 KiB
C
/*-
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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 <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 <stdarg.h>
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#include <unistd.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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struct options {
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int 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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};
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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(void)
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{
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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 [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(struct iiccmd cmd, char *dev, int skip, char *skip_addr)
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{
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struct skip_range addr_range = { 0, 0 };
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int *tokens, fd, error, i, index, j;
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int len = 0, do_skip = 0, no_range = 1;
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fd = open(dev, O_RDWR);
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if (fd == -1) {
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fprintf(stderr, "Error opening I2C controller (%s) for "
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"scanning: %s\n", dev, strerror(errno));
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return (EX_NOINPUT);
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}
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if (skip) {
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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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goto out;
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}
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index = 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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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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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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for (j = 0; j < index; 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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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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goto out;
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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 (!error)
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printf("%x ", i);
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cmd.slave = i << 1;
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cmd.last = 1;
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error = ioctl(fd, I2CSTOP, &cmd);
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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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close(fd);
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if (skip && no_range)
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free(tokens);
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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(struct iiccmd cmd, char *dev)
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{
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int fd, error;
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fd = open(dev, O_RDWR);
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if (fd == -1) {
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fprintf(stderr, "Error opening I2C controller (%s) for "
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"resetting: %s\n", dev, strerror(errno));
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return (EX_NOINPUT);
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}
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printf("Resetting I2C controller on %s: ", dev);
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error = ioctl(fd, I2CRSTCARD, &cmd);
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close (fd);
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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 char *
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prepare_buf(int size, uint32_t off)
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{
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char *buf;
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buf = malloc(size);
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if (buf == NULL)
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return (buf);
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if (size == 1)
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buf[0] = off & 0xff;
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else if (size == 2) {
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buf[0] = (off >> 8) & 0xff;
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buf[1] = off & 0xff;
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}
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return (buf);
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}
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static int
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i2c_write(char *dev, struct options i2c_opt, char *i2c_buf)
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{
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struct iiccmd cmd;
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int ch, i, error, fd, bufsize;
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char *err_msg, *buf;
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/*
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* Read data to be written to the chip from stdin
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*/
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if (i2c_opt.verbose && !i2c_opt.binary)
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fprintf(stderr, "Enter %u bytes of data: ", i2c_opt.count);
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for (i = 0; i < i2c_opt.count; i++) {
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ch = getchar();
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if (ch == EOF) {
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free(i2c_buf);
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err(1, "not enough data, exiting\n");
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}
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i2c_buf[i] = ch;
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}
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fd = open(dev, O_RDWR);
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if (fd == -1) {
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free(i2c_buf);
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err(1, "open failed");
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}
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/*
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* Write offset where the data will go
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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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if (i2c_opt.width) {
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bufsize = i2c_opt.width / 8;
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buf = prepare_buf(bufsize, i2c_opt.off);
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if (buf == NULL) {
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err_msg = "error: offset malloc";
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goto err1;
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}
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cmd.count = bufsize;
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cmd.buf = buf;
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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 when write offset";
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goto err1;
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}
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}
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/* Mode - stop start */
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if (i2c_opt.mode == I2C_MODE_STOP_START) {
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CSTOP, &cmd);
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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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/* Mode - repeated start */
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if (i2c_opt.mode == I2C_MODE_REPEATED_START) {
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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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/*
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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 when write";
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goto err1;
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}
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CSTOP, &cmd);
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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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close(fd);
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return (0);
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err1:
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CSTOP, &cmd);
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if (error == -1)
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fprintf(stderr, "error sending stop condtion\n");
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err2:
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if (err_msg)
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fprintf(stderr, "%s", err_msg);
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close(fd);
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return (1);
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}
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static int
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i2c_read(char *dev, struct options i2c_opt, char *i2c_buf)
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{
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struct iiccmd cmd;
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int i, fd, error, bufsize;
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char *err_msg, data = 0, *buf;
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fd = open(dev, O_RDWR);
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if (fd == -1)
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err(1, "open failed");
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bzero(&cmd, sizeof(cmd));
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if (i2c_opt.width) {
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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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bufsize = i2c_opt.width / 8;
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buf = prepare_buf(bufsize, i2c_opt.off);
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if (buf == NULL) {
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err_msg = "error: offset malloc";
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goto err1;
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}
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cmd.count = bufsize;
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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 when write offset";
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goto err1;
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}
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if (i2c_opt.mode == I2C_MODE_STOP_START) {
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CSTOP, &cmd);
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if (error == -1)
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goto err2;
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}
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}
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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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if (i2c_opt.mode == I2C_MODE_STOP_START) {
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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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} 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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error = ioctl(fd, I2CSTOP, &cmd);
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if (error == -1)
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goto err2;
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for (i = 0; i < i2c_opt.count; i++) {
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error = read(fd, &i2c_buf[i], 1);
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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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}
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close(fd);
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return (0);
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err1:
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cmd.slave = i2c_opt.addr;
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error = ioctl(fd, I2CSTOP, &cmd);
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if (error == -1)
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fprintf(stderr, "error sending stop condtion\n");
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err2:
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if (err_msg)
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fprintf(stderr, "%s", err_msg);
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close(fd);
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return (1);
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}
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int
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main(int argc, char** argv)
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{
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struct iiccmd cmd;
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struct options i2c_opt;
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char *dev, *skip_addr, *i2c_buf;
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int error, chunk_size, i, j, ch;
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errno = 0;
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error = 0;
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/* Line-break the output every chunk_size bytes */
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chunk_size = 16;
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dev = I2C_DEV;
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/* Default values */
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i2c_opt.addr_set = 0;
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i2c_opt.off = 0;
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i2c_opt.verbose = 0;
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i2c_opt.dir = 'r'; /* direction = read */
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i2c_opt.width = 8;
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i2c_opt.count = 1;
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i2c_opt.binary = 0; /* ASCII text output */
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i2c_opt.scan = 0; /* no bus scan */
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i2c_opt.skip = 0; /* scan all addresses */
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i2c_opt.reset = 0; /* no bus reset */
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i2c_opt.mode = I2C_MODE_NOTSET;
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while ((ch = getopt(argc, argv, "a:f:d:o:w:c:m:n:sbvrh")) != -1) {
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switch(ch) {
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case 'a':
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i2c_opt.addr = (strtoul(optarg, 0, 16) << 1);
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if (i2c_opt.addr == 0 && errno == EINVAL)
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i2c_opt.addr_set = 0;
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else
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i2c_opt.addr_set = 1;
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break;
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case 'f':
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dev = optarg;
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break;
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case 'd':
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i2c_opt.dir = optarg[0];
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break;
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case 'o':
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i2c_opt.off = strtoul(optarg, 0, 16);
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if (i2c_opt.off == 0 && errno == EINVAL)
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error = 1;
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break;
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case 'w':
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i2c_opt.width = atoi(optarg);
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break;
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case 'c':
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i2c_opt.count = atoi(optarg);
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break;
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case 'm':
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if (!strcmp(optarg, "no"))
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i2c_opt.mode = I2C_MODE_NONE;
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else if (!strcmp(optarg, "ss"))
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i2c_opt.mode = I2C_MODE_STOP_START;
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else if (!strcmp(optarg, "rs"))
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i2c_opt.mode = I2C_MODE_REPEATED_START;
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else
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usage();
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break;
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case 'n':
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i2c_opt.skip = 1;
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skip_addr = optarg;
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break;
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case 's':
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i2c_opt.scan = 1;
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break;
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case 'b':
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i2c_opt.binary = 1;
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break;
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case 'v':
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i2c_opt.verbose = 1;
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break;
|
|
case 'r':
|
|
i2c_opt.reset = 1;
|
|
break;
|
|
case 'h':
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* Basic sanity check of command line arguments */
|
|
if (i2c_opt.scan) {
|
|
if (i2c_opt.addr_set)
|
|
usage();
|
|
} else if (i2c_opt.reset) {
|
|
if (i2c_opt.addr_set)
|
|
usage();
|
|
} else if (error) {
|
|
usage();
|
|
} else if ((i2c_opt.dir == 'r' || i2c_opt.dir == 'w')) {
|
|
if ((i2c_opt.addr_set == 0) ||
|
|
!(i2c_opt.width == 0 || i2c_opt.width == 8 ||
|
|
i2c_opt.width == 16))
|
|
usage();
|
|
}
|
|
|
|
if (i2c_opt.verbose)
|
|
fprintf(stderr, "dev: %s, addr: 0x%x, r/w: %c, "
|
|
"offset: 0x%02x, width: %u, count: %u\n", dev,
|
|
i2c_opt.addr >> 1, i2c_opt.dir, i2c_opt.off,
|
|
i2c_opt.width, i2c_opt.count);
|
|
|
|
if (i2c_opt.scan)
|
|
exit(scan_bus(cmd, dev, i2c_opt.skip, skip_addr));
|
|
|
|
if (i2c_opt.reset)
|
|
exit(reset_bus(cmd, dev));
|
|
|
|
i2c_buf = malloc(i2c_opt.count);
|
|
if (i2c_buf == NULL)
|
|
err(1, "data malloc");
|
|
|
|
if (i2c_opt.dir == 'w') {
|
|
error = i2c_write(dev, i2c_opt, i2c_buf);
|
|
if (error) {
|
|
free(i2c_buf);
|
|
return (1);
|
|
}
|
|
}
|
|
if (i2c_opt.dir == 'r') {
|
|
error = i2c_read(dev, i2c_opt, i2c_buf);
|
|
if (error) {
|
|
free(i2c_buf);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
if (i2c_opt.verbose)
|
|
fprintf(stderr, "\nData %s (hex):\n", i2c_opt.dir == 'r' ?
|
|
"read" : "written");
|
|
|
|
i = 0;
|
|
j = 0;
|
|
while (i < i2c_opt.count) {
|
|
if (i2c_opt.verbose || (i2c_opt.dir == 'r' &&
|
|
!i2c_opt.binary))
|
|
fprintf (stderr, "%02hhx ", i2c_buf[i++]);
|
|
|
|
if (i2c_opt.dir == 'r' && i2c_opt.binary) {
|
|
fprintf(stdout, "%c", i2c_buf[j++]);
|
|
if(!i2c_opt.verbose)
|
|
i++;
|
|
}
|
|
if (!i2c_opt.verbose && (i2c_opt.dir == 'w'))
|
|
break;
|
|
if ((i % chunk_size) == 0)
|
|
fprintf(stderr, "\n");
|
|
}
|
|
if ((i % chunk_size) != 0)
|
|
fprintf(stderr, "\n");
|
|
|
|
free(i2c_buf);
|
|
return (0);
|
|
}
|