From add2bce315bdb5e99850d39513952cf5aa8ad2bb Mon Sep 17 00:00:00 2001
From: Jean Delvare <jdelvare@suse.de>
Date: Wed, 16 Feb 2011 13:58:38 +0000
Subject: [PATCH] Add support for the at24 kernel driver.

git-svn-id: http://lm-sensors.org/svn/i2c-tools/trunk@5929 7894878c-1315-0410-8ee3-d5d059ff63e0
---
 CHANGES             |  1 +
 eeprom/decode-dimms | 45 ++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/CHANGES b/CHANGES
index 1f7e767..4a7a6d2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,7 @@ i2c-tools CHANGES
 SVN
   decode-dimms: Decode module configuration type of DDR SDRAM
                 Decode refresh rate of DDR SDRAM
+                Add support for the at24 kernel driver
   i2c-dev.h: Make value arrays const for block write functions
   i2cset: Add support for SMBus and I2C block writes
           Removed obsolete method to specify value mask
diff --git a/eeprom/decode-dimms b/eeprom/decode-dimms
index 2ba393a..d996a7b 100755
--- a/eeprom/decode-dimms
+++ b/eeprom/decode-dimms
@@ -5,7 +5,7 @@
 # Copyright 1998, 1999 Philip Edelbrock <phil@netroedge.com>
 # modified by Christian Zuckschwerdt <zany@triq.net>
 # modified by Burkart Lingner <burkart@bollchen.de>
-# Copyright (C) 2005-2009  Jean Delvare <khali@linux-fr.org>
+# Copyright (C) 2005-2011  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
@@ -1710,24 +1710,55 @@ printh('Memory Serial Presence Detect Decoder',
 Jean Delvare, Trent Piepho and others');
 
 
+# From a sysfs device path and an attribute name, return the attribute
+# value, or undef (stolen from sensors-detect)
+sub sysfs_device_attribute
+{
+	my ($device, $attr) = @_;
+	my $value;
+
+	open(local *FILE, "$device/$attr") or return "";
+	$value = <FILE>;
+	close(FILE);
+	return unless defined $value;
+
+	chomp($value);
+	return $value;
+}
+
 sub get_dimm_list
 {
-	my ($dir, $file, @files);
+	my (@dirs, $dir, $file, @files);
 
 	if ($use_sysfs) {
-		$dir = '/sys/bus/i2c/drivers/eeprom';
+		@dirs = ('/sys/bus/i2c/drivers/eeprom', '/sys/bus/i2c/drivers/at24');
 	} else {
-		$dir = '/proc/sys/dev/sensors';
+		@dirs = ('/proc/sys/dev/sensors');
 	}
 
-	if (opendir(local *DIR, $dir)) {
+	foreach $dir (@dirs) {
+		next unless opendir(local *DIR, $dir);
 		while (defined($file = readdir(DIR))) {
-			next if $use_sysfs && $file !~ /^\d+-[\da-f]+$/i;
-			next if !$use_sysfs && $file !~ /^eeprom-/;
+			if ($use_sysfs) {
+				# We look for I2C devices like 0-0050 or 2-0051
+				next unless $file =~ /^\d+-[\da-f]+$/i;
+				next unless -d "$dir/$file";
+
+				# Device name must be eeprom (driver eeprom)
+				# or spd (driver at24)
+				my $attr = sysfs_device_attribute("$dir/$file", "name");
+				next unless defined $attr &&
+					    ($attr eq "eeprom" || $attr eq "spd");
+			} else {
+				next unless $file =~ /^eeprom-/;
+			}
 			push @files, { eeprom => "$file",
 				       file => "$dir/$file" };
 		}
 		close(DIR);
+	}
+
+	if (@files) {
 		return sort { $a->{file} cmp $b->{file} } @files;
 	} elsif (! -d '/sys/module/eeprom') {
 		print "No EEPROM found, are you sure the eeprom module is loaded?\n";