[lm-sensors] sensors-detect:: Drop detection of DS1621-like chips

[Jean Delvare <khali@linux-fr.org>]

Detection of the Dallas/Maxim DS1621, DS1625 and DS1631 chips is weak
and likely to result in false positives. There's no rationale for
keeping it in sensors-detect as these chips are not found in desktop
computer systems. So drop detection of these chips altogether.
---
 prog/detect/sensors-detect |   46 ---------------------------------------------
 1 file changed, 46 deletions(-)

--- lm-sensors.orig/prog/detect/sensors-detect	2013-05-20 13:25:33.992641174 +0200
+++ lm-sensors/prog/detect/sensors-detect	2013-05-20 14:11:21.668063379 +0200
@@ -803,11 +803,6 @@ use vars qw(@i2c_adapter_names);
 		i2c_addrs => [0x2c..0x2f],
 		i2c_detect => sub { adm9240_detect(@_, 0); },
 	}, {
-		name => "Dallas Semiconductor DS1621/DS1631",
-		driver => "ds1621",
-		i2c_addrs => [0x48..0x4f],
-		i2c_detect => sub { ds1621_detect(@_); },
-	}, {
 		name => "Dallas Semiconductor DS1780",
 		driver => "adm9240",
 		i2c_addrs => [0x2c..0x2f],
@@ -4357,47 +4352,6 @@ sub lm92_detect
 	return ($chip = 0) ? 4 : 2;
 }
 
-# Registers used:
-#   0xAA: Temperature
-#   0xA1: High limit
-#   0xA2: Low limit
-#   0xA8: Counter
-#   0xA9: Slope
-#   0xAC: Configuration
-# Detection is weak. We check if bit 4 (NVB) is clear, because it is
-# unlikely to be set (would mean that EEPROM is currently being accessed).
-# We also check the value of the counter and slope registers, the datasheet
-# doesn't mention the possible values but the conversion formula together
-# with experimental evidence suggest possible sanity checks.
-# Not all devices enjoy SMBus read word transactions, so we do as much as
-# possible with read byte transactions first, and only use read word
-# transactions second.
-sub ds1621_detect
-{
-	my ($file, $addr) = @_;
-
-	my $conf = i2c_smbus_read_byte_data($file, 0xAC);
-	return if ($conf & 0x10);
-
-	my $temp = i2c_smbus_read_word_data($file, 0xAA);
-	return if $temp < 0 || ($temp & 0x0f00);
-	# On the DS1631, the following two checks are too strict in theory,
-	# but in practice I very much doubt that anyone will set temperature
-	# limits not a multiple of 0.5 degrees C.
-	my $high = i2c_smbus_read_word_data($file, 0xA1);
-	return if $high < 0 || ($high & 0x7f00);
-	my $low = i2c_smbus_read_word_data($file, 0xA2);
-	return if $low < 0 || ($low & 0x7f00);
-
-	return if ($temp = 0 && $high = 0 && $low = 0 && $conf = 0);
-
-	# Old versions of the DS1621 apparently don't have the counter and
-	# slope registers (or they return crap)
-	my $counter = i2c_smbus_read_byte_data($file, 0xA8);
-	my $slope = i2c_smbus_read_byte_data($file, 0xA9);
-	return ($slope = 0x10 && $counter <= $slope) ? 3 : 2;
-}
-
 # Chip to detect: 0 = LM80, 1 = LM96080
 # Registers used:
 #   0x00: Configuration register


-- 
Jean Delvare

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