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Better detection code for LM75, based on datasheet and known

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hardware.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1829 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare
2003-07-02 09:06:51 +00:00
parent 98a5fe64bd
commit a5aa0fce16
2 changed files with 26 additions and 4 deletions
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3
CHANGES
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@@ -102,7 +102,8 @@ ask CVS about it:
Fix "C" format error;
Add support for adm1026, 82801EB (ICH5), W83791D;
Add support for w83l785ts, nForce2;
Fix UTF-8 incompatibility
Fix UTF-8 incompatibility;
Better support for lm75
2.7.0 (20021208)
NOTE: Requires i2c-2.7.0 or newer.

27
prog/detect/sensors-detect
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@@ -2266,12 +2266,20 @@ sub lm78_alias_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.
# Returns: undef if not detected, 2 to 6 if detected;
# 6 means that the LM75 was found in its default power up state;
# 5 means that the LM75 was found in another known default state;
# 4 means that the LM75 was found in a probable state (temperatures
# make sense);
# 3 means that the configuration register passes the test;
# 2 means that the configuration register test failed, so the chipset
# is unlikely to be a LM75.
# Registers used:
# 0x01: Temperature
# 0x01: Configuration
# 0x02: Hysteresis
# 0x03: Overtemperature Shutdown
# Detection really sucks! It is only based on the fact that the LM75 has only
# The first detection step is only based on the fact that the LM75 has only
# four registers. Any other chip in the valid address range with only four
# registers will be detected too.
# Note that register $00 may change, so we can't use the modulo trick on it.
@@ -2288,7 +2296,20 @@ sub lm75_detect
return if i2c_smbus_read_word_data($file,($i * 0x08) + 0x02) != $hyst;
return if i2c_smbus_read_word_data($file,($i * 0x08) + 0x03) != $os;
}
return (3);
# Default power up state (from specs)
return 6
if $conf == 0 and ($hyst&0x80ff) == 0x004b and ($os&0x80ff) == 0x0050;
# Default state as seen on the Asus TX97-E
return 5
if $conf == 0 and ($hyst&0x80ff) == 0x002d and ($os&0x80ff) == 0x0034;
# Most probable value ranges
return 4
if ($conf&0xe0) == 0 and (($cur&0x00ff) <= 125 || ($cur&0x00ff) >= 201)
and ($hyst&0x00ff) <= 125 and ($os&0x00ff) <= 125 and $hyst<$os;
# Unused bits in conf register
return 3
if ($conf&0xe0) == 0;
return 2;
}
# $_[0]: A reference to the file descriptor to access this chip.