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Drop unreliable DS1621/DS1631 detection

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Detection of the Dallas/Maxim DS1621, DS1625 and DS1631 chips is weak
and likely to result in false positive. 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.
This commit is contained in:
Jean Delvare
2013-05-20 19:25:22 +00:00
parent 74252b1dd3
commit 8f4461622c
2 changed files with 1 additions and 46 deletions
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46
prog/detect/sensors-detect
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@@ -802,11 +802,6 @@ use vars qw(@i2c_adapter_names);
driver => "adm9240",
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",
@@ -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