From 57373f9e6b947693b744e889cd97602baed5cff9 Mon Sep 17 00:00:00 2001
From: Jean Delvare <khali@linux-fr.org>
Date: Tue, 15 Dec 2009 16:57:34 +0000
Subject: [PATCH] Improve AMC6821 detection.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@5812 7894878c-1315-0410-8ee3-d5d059ff63e0
---
 prog/detect/sensors-detect | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/prog/detect/sensors-detect b/prog/detect/sensors-detect
index fdca68aa..ea0d8dfb 100755
--- a/prog/detect/sensors-detect
+++ b/prog/detect/sensors-detect
@@ -4063,7 +4063,12 @@ sub amc6821_detect()
 	my $comp_id = i2c_smbus_read_byte_data($file, 0x3e);
 
 	return if ($comp_id != 0x49);		# Texas Instruments
-	return 5 if ($dev_id == 0x21);		# AMC6821
+
+	# Bit 7 of register address is ignored
+	return if i2c_smbus_read_byte_data($file, 0x80 | 0x3d) != $dev_id;
+	return if i2c_smbus_read_byte_data($file, 0x80 | 0x3e) != $comp_id;
+
+	return 6 if ($dev_id == 0x21);		# AMC6821
 
 	return;
 }