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32fbdf8ba4
displaying error messages. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@3077 7894878c-1315-0410-8ee3-d5d059ff63e0
277 lines
6.6 KiB
C
277 lines
6.6 KiB
C
/*
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i2cdetect.c - a user-space program to scan for I2C devices
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Copyright (C) 1999-2004 Frodo Looijaard <frodol@dds.nl>,
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Mark D. Studebaker <mdsxyz123@yahoo.com> and
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Jean Delvare <khali@linux-fr.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "../dump/i2cbusses.h"
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#include "i2c-dev.h"
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#include "version.h"
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#define MODE_AUTO 0
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#define MODE_QUICK 1
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#define MODE_READ 2
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void help(void)
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{
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fprintf(stderr,
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"Syntax: i2cdetect [-y] [-a] [-q|-r] I2CBUS [FIRST LAST]\n"
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" i2cdetect -l\n"
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" i2cdetect -V\n"
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" I2CBUS is an integer\n"
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" With -a, probe all addresses (NOT RECOMMENDED)\n"
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" With -q, uses only quick write commands for probing (NOT "
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"RECOMMENDED)\n"
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" With -r, uses only read byte commands for probing (NOT "
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"RECOMMENDED)\n"
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" If provided, FIRST and LAST limit the probing range.\n"
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" With -l, lists installed busses only\n");
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print_i2c_busses(0);
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}
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int scan_i2c_bus(int file, const int mode, const int first, const int last)
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{
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int i, j;
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int res;
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printf(" 0 1 2 3 4 5 6 7 8 9 a b c d e f\n");
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for (i = 0; i < 128; i += 16) {
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printf("%02x: ", i);
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for(j = 0; j < 16; j++) {
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/* Skip unwanted addresses */
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if (i+j < first || i+j > last) {
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printf(" ");
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continue;
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}
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/* Set slave address */
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if (ioctl(file, I2C_SLAVE, i+j) < 0) {
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if (errno == EBUSY) {
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printf("UU ");
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continue;
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} else {
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fprintf(stderr, "Error: Could not set "
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"address to 0x%02x: %s\n", i+j,
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strerror(errno));
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return -1;
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}
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}
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/* Probe this address */
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switch (mode) {
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case MODE_QUICK:
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/* This is known to corrupt the Atmel AT24RF08
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EEPROM */
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res = i2c_smbus_write_quick(file,
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I2C_SMBUS_WRITE);
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break;
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case MODE_READ:
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/* This is known to lock SMBus on various
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write-only chips (mainly clock chips) */
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res = i2c_smbus_read_byte(file);
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break;
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default:
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if ((i+j >= 0x30 && i+j <= 0x37)
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|| (i+j >= 0x50 && i+j <= 0x5F))
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res = i2c_smbus_read_byte(file);
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else
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res = i2c_smbus_write_quick(file,
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I2C_SMBUS_WRITE);
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}
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if (res < 0)
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printf("XX ");
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else
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printf("%02x ", i+j);
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}
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printf("\n");
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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char *end;
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int i2cbus, file, res;
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char filename[20];
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long funcs;
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int mode = MODE_AUTO;
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int first = 0x03, last = 0x77;
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int flags = 0;
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int yes = 0, version = 0, list = 0;
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/* handle (optional) flags first */
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while (1+flags < argc && argv[1+flags][0] == '-') {
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switch (argv[1+flags][1]) {
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case 'V': version = 1; break;
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case 'y': yes = 1; break;
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case 'l': list = 1; break;
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case 'r':
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if (mode == MODE_QUICK) {
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fprintf(stderr, "Error: Different modes "
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"specified!\n");
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exit(1);
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}
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mode = MODE_READ;
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break;
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case 'q':
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if (mode == MODE_READ) {
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fprintf(stderr, "Error: Different modes "
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"specified!\n");
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exit(1);
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}
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mode = MODE_QUICK;
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break;
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case 'a':
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first = 0x00;
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last = 0x7F;
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break;
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default:
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fprintf(stderr, "Warning: Unsupported flag "
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"\"-%c\"!\n", argv[1+flags][1]);
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help();
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exit(1);
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}
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flags++;
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}
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if (version) {
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fprintf(stderr, "i2cdetect version %s\n", LM_VERSION);
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exit(0);
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}
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if (list) {
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print_i2c_busses(1);
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exit(0);
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}
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if (argc < flags + 2) {
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fprintf(stderr, "Error: No i2c-bus specified!\n");
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help();
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exit(1);
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}
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i2cbus = strtol(argv[flags+1], &end, 0);
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if (*end) {
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fprintf(stderr, "Error: I2CBUS argument not a number!\n");
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help();
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exit(1);
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}
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if ((i2cbus < 0) || (i2cbus > 0xff)) {
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fprintf(stderr, "Error: I2CBUS argument out of range "
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"(0-255)!\n");
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help();
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exit(1);
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}
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/* read address range if present */
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if (argc == flags + 4) {
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int tmp;
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tmp = strtol(argv[flags+2], &end, 0);
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if (*end) {
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fprintf(stderr, "Error: FIRST argment not a "
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"number!\n");
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help();
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exit(1);
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}
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if (tmp < first || tmp > last) {
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fprintf(stderr, "Error: FIRST argument out of range "
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"(0x%02x-0x%02x)!\n", first, last);
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help();
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exit(1);
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}
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first = tmp;
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tmp = strtol(argv[flags+3], &end, 0);
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if (*end) {
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fprintf(stderr, "Error: LAST argment not a "
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"number!\n");
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help();
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exit(1);
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}
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if (tmp < first || tmp > last) {
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fprintf(stderr, "Error: LAST argument out of range "
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"(0x%02x-0x%02x)!\n", first, last);
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help();
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exit(1);
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}
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last = tmp;
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} else if (argc != flags + 2) {
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help();
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exit(1);
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}
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file = open_i2c_dev(i2cbus, filename, 0);
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if (file < 0) {
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exit(1);
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}
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if (ioctl(file, I2C_FUNCS, &funcs) < 0) {
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fprintf(stderr, "Error: Could not get the adapter "
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"functionality matrix: %s\n", strerror(errno));
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close(file);
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exit(1);
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}
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if (mode != MODE_READ && !(funcs & I2C_FUNC_SMBUS_QUICK)) {
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fprintf(stderr, "Error: Can't use SMBus Quick Write command "
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"on this bus (ISA bus?)\n");
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close(file);
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exit(1);
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}
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if (mode != MODE_QUICK && !(funcs & I2C_FUNC_SMBUS_READ_BYTE)) {
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fprintf(stderr, "Error: Can't use SMBus Read Byte command "
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"on this bus (ISA bus?)\n");
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close(file);
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exit(1);
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}
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if (!yes) {
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char s[2];
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fprintf(stderr, "WARNING! This program can confuse your I2C "
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"bus, cause data loss and worse!\n");
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fprintf(stderr, "I will probe file %s%s.\n", filename,
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mode==MODE_QUICK?" using quick write commands":
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mode==MODE_READ?" using read byte commands":"");
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fprintf(stderr, "I will probe address range 0x%02x-0x%02x.\n",
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first, last);
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fprintf(stderr, "Continue? [Y/n] ");
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fflush(stderr);
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fgets(s, 2, stdin);
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if (s[0] != '\n' && s[0] != 'y' && s[0] != 'Y') {
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fprintf(stderr, "Aborting on user request.\n");
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exit(0);
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}
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}
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res = scan_i2c_bus(file, mode, first, last);
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close(file);
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exit(res?1:0);
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}
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