blob: f91da1cfc9b0274ad8d823e8cf3b30c9ba625984 [file] [log] [blame]
#!/usr/bin/perl -w
#
# Copyright (C) 2007-2008 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
#
# This script feeds the i2c-stub driver with dump data from a real
# I2C or SMBus chip. This can be useful when writing a driver for
# a device you do not have access to, but of which you have a dump.
use strict;
use vars qw($bus_nr $addr $bytes $words $err);
# Kernel version detection code by Mark M. Hoffman,
# copied from sensors-detect.
use vars qw(@kernel_version);
sub initialize_kernel_version
{
`uname -r` =~ /(\d+)\.(\d+)\.(\d+)(.*)/;
@kernel_version = ($1, $2, $3, $4);
}
sub kernel_version_at_least
{
my ($vers, $plvl, $slvl) = @_;
return 1 if ($kernel_version[0] > $vers ||
($kernel_version[0] == $vers &&
($kernel_version[1] > $plvl ||
($kernel_version[1] == $plvl &&
($kernel_version[2] >= $slvl)))));
return 0;
}
# Find out the i2c bus number of i2c-stub
sub get_i2c_stub_bus_number
{
my $nr;
open(FH, "i2cdetect -l |") || die "Can't run i2cdetect";
while (<FH>) {
next unless m/^i2c-(\d+).*\tSMBus stub/;
$nr = $1;
last;
}
close(FH);
return $nr;
}
# Load the required kernel drivers if needed
sub load_kernel_drivers
{
local $_;
my $addr = oct shift;
my $nr;
# Maybe everything is already loaded
$nr = get_i2c_stub_bus_number();
if (defined $nr) {
if (kernel_version_at_least(2, 6, 19)) {
# Check if the chip address we need is there
open(CHIP_ADDR, "/sys/module/i2c_stub/parameters/chip_addr");
$_ = <CHIP_ADDR>;
chomp;
my @stub_addr = split ',';
close(CHIP_ADDR);
foreach (@stub_addr) {
return $nr if $addr == $_;
}
printf STDERR "i2c-stub already loaded without support for address 0x%02x\n", $addr;
exit 2;
}
return $nr;
}
system("/sbin/modprobe", "i2c-dev") == 0 || exit 1;
if (kernel_version_at_least(2, 6, 19)) {
system("/sbin/modprobe", "i2c-stub", "chip_addr=$addr") == 0 || exit 1;
} else {
system("/sbin/modprobe", "i2c-stub") == 0 || exit 1;
}
sleep(1); # udev may take some time to create the device node
$nr = get_i2c_stub_bus_number();
if (!defined($nr)) {
print STDERR "Please load i2c-stub first\n";
exit 2;
}
return $nr;
}
sub process_dump
{
my $dump = shift;
my $err = 0;
open(DUMP, $dump) || die "Can't open $dump: $!\n";
OUTER_LOOP:
while (<DUMP>) {
if (m/^([0-9a-f]0):(( [0-9a-fX]{2}){16})/) {
# Byte dump
my $offset = hex($1);
my @values = split(/ /, $2);
shift(@values);
for (my $i = 0; $i < 16 && (my $val = shift(@values)); $i++) {
next if $val =~ m/X/;
if (system("i2cset", "-y", $bus_nr, $addr,
sprintf("0x\%02x", $offset+$i),
"0x$val", "b")) {
$err = 3;
last OUTER_LOOP;
}
$bytes++;
}
} elsif (m/^([0-9a-f][08]):(( [0-9a-fX]{4}){8})/) {
# Word dump
my $offset = hex($1);
my @values = split(/ /, $2);
shift(@values);
for (my $i = 0; $i < 8 && (my $val = shift(@values)); $i++) {
next if $val =~ m/X/;
if (system("i2cset", "-y", $bus_nr, $addr,
sprintf("0x\%02x", $offset+$i),
"0x$val", "w")) {
$err = 3;
last OUTER_LOOP;
}
$words++;
}
}
}
close(DUMP);
return $err;
}
if ($>) {
print "You must be root to use this script\n";
exit 1;
}
if (@ARGV != 2) {
print STDERR "Usage: i2c-stub-from-dump <addr> <dump file>\n";
exit 1;
}
# Check the parameters
$addr = $ARGV[0];
if ($addr !~ m/^0x[0-7][0-9a-f]$/i) {
print STDERR "Invalid address $addr\n";
exit 1;
}
initialize_kernel_version();
$bus_nr = load_kernel_drivers($addr);
$bytes = $words = 0;
# We don't want to see the output of 256 i2cset
open(SAVEOUT, ">&STDOUT");
open(STDOUT, ">/dev/null");
$err = process_dump($ARGV[1]);
close(STDOUT);
if ($bytes) {
printf SAVEOUT "$bytes byte values written to \%d-\%04x\n",
$bus_nr, oct($addr);
}
if ($words) {
printf SAVEOUT "$words word values written to \%d-\%04x\n",
$bus_nr, oct($addr);
}
if (!$err && ($bytes + $words == 0)) {
printf SAVEOUT "Only garbage found in dump file $ARGV[1]\n";
exit(1);
}
exit($err);