mir/lm-sensors
2
0
Fork 0
mirror of https://github.com/lm-sensors/lm-sensors synced 2025-08-31 06:15:15 +00:00
Code Issues Releases Wiki Activity

Prevent LM75 misdetection as a DS1621.

Browse Source 
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2133 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare
2003-12-02 20:57:02 +00:00
parent 2109093db3
commit fb77f38e4d
1 changed files with 14 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
prog/detect/sensors-detect
View File

@@ -2546,19 +2546,30 @@ sub lm75_detect
# We may assume an i2c_set_slave_addr was already done.
# $_[1]: Address
# Returns: undef if not detected, (3) if detected,
# (6) or (9) if even more bits match.
# (5) or (7) if even more bits match.
# 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.
# Temperature checkings will hopefully prevent LM75 chips from being
# detected as a DS1621.
sub ds1621_detect
{
my $i;
my ($file,$addr) = @_;
my $temp = i2c_smbus_read_word_data($file,0xAA);
return if ($temp & 0x007F);
$temp = i2c_smbus_read_word_data($file,0xA1);
return if ($temp & 0x007F);
$temp = i2c_smbus_read_word_data($file,0xA2);
return if ($temp & 0x007F);
my $conf = i2c_smbus_read_byte_data($file,0xAC);
return (9) if ($conf & 0x9F) == 0x98;
return (6) if ($conf & 0x0F) == 0x08;
return (7) if ($conf & 0x9F) == 0x98;
return (5) if ($conf & 0x0F) == 0x08;
return (3) if ($conf & 0x0C) == 0x08;
return ;
}