root/i2c-tools/trunk/eeprom/decode-vaio

#!/usr/bin/perl -w
#
# Copyright (C) 2002-2008  Jean Delvare <khali@linux-fr.org>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#    MA 02110-1301 USA.
#
# EEPROM data decoding for Sony Vaio laptops. 
#
# The eeprom driver must be loaded. For kernels older than 2.6.0, the
# eeprom driver can be found in the lm-sensors package.
#
# Please note that this is a guess-only work.  Sony support refused to help
# me, so if someone can provide information, please contact me.
# My knowledge is summarized on this page:
# http://khali.linux-fr.org/vaio/eeprom.html
#
# It seems that if present, the EEPROM is always at 0x57.
#
# Models tested so far:
#   PCG-F403     : No EEPROM
#   PCG-F707     : No EEPROM
#   PCG-GR114EK  : OK
#   PCG-GR114SK  : OK
#   PCG-GR214EP  : OK
#   PCG-GRT955MP : OK
#   PCG-GRX316G  : OK
#   PCG-GRX570   : OK
#   PCG-GRX600K  : OK
#   PCG-U1       : OK
#   PCG-Z600LEK  : No EEPROM
#   PCG-Z600NE   : No EEPROM
#   VGN-S260     : OK
#   VGN-S4M/S    : OK
#   VGN-TZ11MN/N : OK
#
# Thanks to Werner Heuser, Carsten Blume, Christian Gennerat, Joe Wreschnig,
# Xavier Roche, Sebastien Lefevre, Lars Heer, Steve Dobson, Kent Hunt,
# Timo Hoenig and others for their precious help.


use strict;
use Fcntl qw(:DEFAULT :seek);
use vars qw($sysfs $found);

use constant VERSION    => "1.6";
use constant ONLYROOT   => "Readable only by root";

sub print_item
{
        my ($label,$value) = @_;
        
        printf("\%16s : \%s\n",$label,$value);
}

# Abstract reads so that other functions don't have to care wether
# we need to use procfs or sysfs
sub read_eeprom_bytes
{
        my ($bus, $addr, $offset, $length) = @_;
        my $filename;
        
        if ($sysfs)
        {
                $filename = "/sys/bus/i2c/devices/$bus-00$addr/eeprom";
                sysopen(FH, $filename, O_RDONLY)
                        or die "Can't open $filename";
                sysseek(FH, $offset, SEEK_SET)
                        or die "Can't seek in $filename";

                my ($r, $bytes);
                $bytes = '';
                $offset = 0;
                while($length)
                {
                        $r = sysread(FH, $bytes, $length, $offset);
                        die "Can't read $filename"
                                unless defined($r);
                        die "Unexpected EOF in $filename"
                                unless $r;
                        $offset += $r;
                        $length -= $r;
                }
                close(FH);
                
                return $bytes;
        }
        else
        {
                my $base = $offset & 0xf0;
                $offset -= $base;
                my $values = '';
                my $remains = $length + $offset;
                
                # Get all lines in a single string
                while ($remains > 0)
                {
                        $filename = "/proc/sys/dev/sensors/eeprom-i2c-$bus-$addr/"
                                  . sprintf('%02x', $base);
                        open(FH, $filename)
                                or die "Can't open $filename";
                        $values .= <FH>;
                        close(FH);
                        $remains -= 16;
                        $base += 16;
                }
                
                # Store the useful part in an array
                my @bytes = split(/[ \n]/, $values);
                @bytes = @bytes[$offset..$offset+$length-1];

                # Back to a binary string
                return pack('C*', @bytes);
        }
}

sub decode_string
{
        my ($bus, $addr, $offset, $length) = @_;

        my $string = read_eeprom_bytes($bus, $addr, $offset, $length);
        $string =~ s/\x00.*$//;
        
        return($string);
}

sub decode_hexa
{
        my ($bus, $addr, $offset, $length) = @_;

        my @bytes = unpack('C*', read_eeprom_bytes($bus, $addr, $offset, $length));
        my $string='';

        for(my $i=0;$i<$length;$i++)
        {
                $string.=sprintf('%02X', shift(@bytes));
        }

        return($string);
}

sub decode_uuid
{
        my ($bus,$addr,$base) = @_;

        my @bytes = unpack('C16', read_eeprom_bytes($bus, $addr, $base, 16));
        my $string='';

        for(my $i=0;$i<16;$i++)
        {
                $string.=sprintf('%02x',shift(@bytes));
                if(($i==3)||($i==5)||($i==7)||($i==9))
                {
                        $string.='-';
                }
        }

        if ($string eq '00000000-0000-0000-0000-000000000000')
        {
                return(ONLYROOT);
        }
        else
        {
                return($string);
        }
}

sub vaio_decode
{
        my ($bus,$addr) = @_;
        
        my $name = decode_string($bus, $addr, 128, 32);
        # Simple heuristic to skip false positives
        return 0 unless $name =~ m/^[A-Z-]{4}/;

        print_item('Machine Name', $name);
        my $serial = decode_string($bus, $addr, 192, 32);
        print_item('Serial Number', $serial ? $serial : ONLYROOT);
        print_item('UUID', decode_uuid($bus, $addr, 16));
        my $revision = decode_string($bus, $addr, 160, 10);
        print_item(length($revision) > 2 ? 'Service Tag' : 'Revision',
                   $revision);
        print_item('Asset Tag', decode_string($bus, $addr, 170, 4).
                                decode_hexa($bus, $addr, 174, 12));
        print_item('OEM Data', decode_string($bus, $addr, 32, 16));
        print_item('Timestamp', decode_string($bus, $addr, 224, 18));
        return 1;
}

BEGIN
{
        print("# Sony Vaio EEPROM Decoder version ".VERSION." by Jean Delvare\n\n");
}

END
{
        print("\n");
}

for (my $i = 0, $found=0; $i <= 4 && !$found; $i++)
{
        if (-r "/sys/bus/i2c/devices/$i-0057/eeprom")
        {
                $sysfs = 1;
                $found += vaio_decode($i, '57');
        }
        elsif (-r "/proc/sys/dev/sensors/eeprom-i2c-$i-57")
        {
                if (-r "/proc/sys/dev/sensors/eeprom-i2c-$i-57/data0-15")
                {
                        print("Deprecated old interface found.  Please upgrade to lm_sensors 2.6.3 or greater.");
                        exit;
                }
                else
                {
                        $sysfs = 0;
                        $found += vaio_decode($i, '57');
                }
        }
}

if (!$found)
{
        print("Vaio EEPROM not found.  Please make sure that the eeprom module is loaded.\n");
}