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Fix the DS1621 detection which was broken since December 2003.

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Thanks to Peter A. Henning for reporting.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2852 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare
2005-01-19 20:38:58 +00:00
parent cf38b5e7e1
commit 7f5983c5a6
1 changed files with 8 additions and 12 deletions
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20
prog/detect/sensors-detect
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@@ -3008,16 +3008,14 @@ sub lm92_detect
# $_[0]: A reference to the file descriptor to access this chip.
# We may assume an i2c_set_slave_addr was already done.
# $_[1]: Address
# Returns: undef if not detected, (3) if detected,
# (5) or (7) if even more bits match.
# Returns: undef if not detected, 3 if detected
# Registers used:
# 0xAA: Temperature
# 0xA1: High limit
# 0xA2: Low limit
# 0xAC: Configuration
# Detection is weak. We check if Bit 3 is set and Bit 2 is clear.
# The DS1621 will aways have a config like 0x????10??. A even better
# match would be 0x0??01000.
# 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).
# Temperature checkings will hopefully prevent LM75 chips from being
# detected as a DS1621.
sub ds1621_detect
@@ -3025,16 +3023,14 @@ sub ds1621_detect
my $i;
my ($file,$addr) = @_;
my $temp = i2c_smbus_read_word_data($file,0xAA);
return if ($temp & 0x007F);
return if ($temp & 0x7F00);
$temp = i2c_smbus_read_word_data($file,0xA1);
return if ($temp & 0x007F);
return if ($temp & 0x7F00);
$temp = i2c_smbus_read_word_data($file,0xA2);
return if ($temp & 0x007F);
return if ($temp & 0x7F00);
my $conf = i2c_smbus_read_byte_data($file,0xAC);
return (7) if ($conf & 0x9F) == 0x98;
return (5) if ($conf & 0x0F) == 0x08;
return (3) if ($conf & 0x0C) == 0x08;
return ;
return 3 if ($conf & 0x10) == 0x00;
return;
}
# $_[0]: A reference to the file descriptor to access this chip.