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357
Script/i2c-tools-3.1.0/tools/i2cdetect.c
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357
Script/i2c-tools-3.1.0/tools/i2cdetect.c
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/*
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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>, and
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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Copyright (C) 2004-2010 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., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301 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 <linux/i2c-dev.h>
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#include "i2cbusses.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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#define MODE_FUNC 3
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static void help(void)
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{
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fprintf(stderr,
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"Usage: i2cdetect [-y] [-a] [-q|-r] I2CBUS [FIRST LAST]\n"
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" i2cdetect -F I2CBUS\n"
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" i2cdetect -l\n"
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" I2CBUS is an integer or an I2C bus name\n"
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" If provided, FIRST and LAST limit the probing range.\n");
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}
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static int scan_i2c_bus(int file, int mode, int first, 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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fflush(stdout);
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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("-- ");
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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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struct func
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{
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long value;
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const char* name;
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};
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static const struct func all_func[] = {
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{ .value = I2C_FUNC_I2C,
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.name = "I2C" },
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{ .value = I2C_FUNC_SMBUS_QUICK,
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.name = "SMBus Quick Command" },
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{ .value = I2C_FUNC_SMBUS_WRITE_BYTE,
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.name = "SMBus Send Byte" },
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{ .value = I2C_FUNC_SMBUS_READ_BYTE,
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.name = "SMBus Receive Byte" },
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{ .value = I2C_FUNC_SMBUS_WRITE_BYTE_DATA,
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.name = "SMBus Write Byte" },
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{ .value = I2C_FUNC_SMBUS_READ_BYTE_DATA,
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.name = "SMBus Read Byte" },
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{ .value = I2C_FUNC_SMBUS_WRITE_WORD_DATA,
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.name = "SMBus Write Word" },
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{ .value = I2C_FUNC_SMBUS_READ_WORD_DATA,
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.name = "SMBus Read Word" },
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{ .value = I2C_FUNC_SMBUS_PROC_CALL,
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.name = "SMBus Process Call" },
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{ .value = I2C_FUNC_SMBUS_WRITE_BLOCK_DATA,
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.name = "SMBus Block Write" },
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{ .value = I2C_FUNC_SMBUS_READ_BLOCK_DATA,
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.name = "SMBus Block Read" },
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{ .value = I2C_FUNC_SMBUS_BLOCK_PROC_CALL,
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.name = "SMBus Block Process Call" },
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{ .value = I2C_FUNC_SMBUS_PEC,
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.name = "SMBus PEC" },
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{ .value = I2C_FUNC_SMBUS_WRITE_I2C_BLOCK,
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.name = "I2C Block Write" },
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{ .value = I2C_FUNC_SMBUS_READ_I2C_BLOCK,
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.name = "I2C Block Read" },
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{ .value = 0, .name = "" }
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};
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static void print_functionality(unsigned long funcs)
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{
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int i;
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for (i = 0; all_func[i].value; i++) {
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printf("%-32s %s\n", all_func[i].name,
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(funcs & all_func[i].value) ? "yes" : "no");
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}
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}
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/*
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* Print the installed i2c busses. The format is those of Linux 2.4's
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* /proc/bus/i2c for historical compatibility reasons.
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*/
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static void print_i2c_busses(void)
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{
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struct i2c_adap *adapters;
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int count;
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adapters = gather_i2c_busses();
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if (adapters == NULL) {
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fprintf(stderr, "Error: Out of memory!\n");
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return;
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}
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for (count = 0; adapters[count].name; count++) {
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printf("i2c-%d\t%-10s\t%-32s\t%s\n",
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adapters[count].nr, adapters[count].funcs,
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adapters[count].name, adapters[count].algo);
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}
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free_adapters(adapters);
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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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unsigned 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 'F':
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if (mode != MODE_AUTO && mode != MODE_FUNC) {
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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_FUNC;
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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, "Error: Unsupported option "
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"\"%s\"!\n", argv[1+flags]);
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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", VERSION);
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exit(0);
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}
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if (list) {
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print_i2c_busses();
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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 = lookup_i2c_bus(argv[flags+1]);
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if (i2cbus < 0) {
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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 && mode != MODE_FUNC) {
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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, sizeof(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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/* Special case, we only list the implemented functionalities */
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if (mode == MODE_FUNC) {
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close(file);
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printf("Functionalities implemented by %s:\n", filename);
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print_functionality(funcs);
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exit(0);
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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\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\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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if (!fgets(s, 2, stdin)
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|| (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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