i2c-stub-from-dump: New helper script to use with the i2c-stub kernel

driver.


git-svn-id: http://lm-sensors.org/svn/i2c-tools/trunk@5002 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -4,6 +4,7 @@ i2c-tools CHANGES
 SVN
   i2cset: Final status messages go to stdout
           Return success even when readback fails or doesn't match
+  i2c-stub-from-dump: Helper script to use with i2c-stub
 
 3.0.0 (2007-10-14)
   Initial release

Makefile

@@ -33,4 +33,5 @@ all:
 
 include eeprom/Module.mk
 include include/Module.mk
+include stub/Module.mk
 include tools/Module.mk

README

@@ -27,6 +27,10 @@ category has its own sub-directory:
 * py-smbus
   Python wrapper for SMBus access over i2c-dev. Not installed by default.
 
+* stub
+  A helper script to use with the i2c-stub kernel driver. Installed by
+  default.
+
 * tools
   I2C device detection and register dump tools. These tools rely on the
   "i2c-dev" kernel driver. They are installed by default.

stub/Module.mk

@@ -0,0 +1,22 @@
+# Helper for the Linux i2c-stub bus driver
+#
+# Copyright (C) 2007  Jean Delvare <khali@linux-fr.org>
+#
+# Licensed under the GNU General Public License.
+
+STUB_DIR	:= stub
+
+#
+# Commands
+#
+
+install-stub: $(STUB_DIR)/i2c-stub-from-dump
+	$(INSTALL_DIR) $(DESTDIR)$(bindir)
+	$(INSTALL_PROGRAM) $(STUB_DIR)/i2c-stub-from-dump $(DESTDIR)$(bindir)
+
+uninstall-stub:
+	$(RM) $(DESTDIR)$(bindir)/i2c-stub-from-dump
+
+install: install-stub
+
+uninstall: uninstall-stub

stub/i2c-stub-from-dump

@@ -0,0 +1,100 @@
+#!/usr/bin/perl -w
+#
+# Copyright (C) 2007       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 $count);
+
+# 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 = $1;
+		last;
+	}
+	close(FH);
+
+	if (!defined($nr)) {
+		print STDERR "Please load i2c-stub first\n";
+		exit 2;
+	}
+
+	return $nr;
+}
+
+if ($>) {
+	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 $addr\n";
+	exit 1;
+}
+
+# Load the required kernel drivers if needed
+system("/sbin/modprobe", "i2c-dev") == 0 || exit 1;
+system("/sbin/modprobe", "i2c-stub", "chip_addr=$addr") == 0 || exit 1;
+sleep(1); # udev may take some time to create the device node
+
+$bus_nr = get_i2c_stub_bus_number();
+
+# We don't want to see the output of 256 i2cset
+open(SAVEOUT, ">&STDOUT");
+open(STDOUT, ">/dev/null");
+
+$count = 0;
+open(DUMP, $ARGV[1]) || die "Can't open $ARGV[1]: $!\n";
+OUTER_LOOP:
+while (<DUMP>) {
+	next unless m/^([0-9a-f]0):(( [0-9a-f]{2}){16})/;
+	my $offset = hex($1);
+	my @values = split(/ /, $2);
+	shift(@values);
+	for (my $i = 0; $i < 16 && (my $val = shift(@values)); $i++) {
+		last OUTER_LOOP if system("i2cset", "-y",
+			$bus_nr, $addr,
+			sprintf("0x\%02x", $offset+$i),
+			sprintf("0x\%02x", hex($val)), "b");
+		$count++;
+	}
+}
+close(DUMP);
+close(STDOUT);
+
+if ($count) {
+	printf SAVEOUT "$count byte values written to \%d-\%04x\n",
+		$bus_nr, oct($addr);
+}
+
+exit($count == 0);