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Add detection of National Semiconductor LM75A.

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git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@5935 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare
2011-02-24 09:49:17 +00:00
parent ee7271756f
commit 17aba10bf3
2 changed files with 37 additions and 12 deletions
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48
prog/detect/sensors-detect
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@@ -501,6 +501,11 @@ use vars qw(@i2c_adapter_names);
driver => "lm75",
i2c_addrs => [0x48..0x4f],
i2c_detect => sub { lm75_detect(@_, 0); },
}, {
name => "National Semiconductor LM75A",
driver => "lm75",
i2c_addrs => [0x48..0x4f],
i2c_detect => sub { lm75_detect(@_, 2); },
}, {
name => "Dallas Semiconductor DS75",
driver => "lm75",
@@ -3839,13 +3844,14 @@ sub lm78_detect
return 6;
}
# Chip to detect: 0 = LM75, 1 = DS75
# Chip to detect: 0 = LM75, 1 = DS75, 2 = LM75A
# Registers used:
# 0x00: Temperature
# 0x01: Configuration
# 0x02: Hysteresis
# 0x03: Overtemperature Shutdown
# 0x04-0x07: No registers
# 0x07: Device ID (LM75A only)
# The first detection step is based on the fact that the LM75 has only
# four registers, and cycles addresses over 8-byte boundaries. We use the
# 0x04-0x07 addresses (unused) to improve the reliability. These are not
@@ -3855,6 +3861,9 @@ sub lm78_detect
# The DS75 is a bit different, it doesn't cycle over 8-byte boundaries, and
# all register addresses from 0x04 to 0x0f behave like 0x04-0x07 do for
# the LM75.
# And the LM75A is again different, it cycles over 8-byte boundaries, but
# registers 0x04-0x06 return 0xff. Thankfully it has a device ID register
# at 0x07.
# Not all devices enjoy SMBus read word transactions, so we use read byte
# transactions even for the 16-bit registers. The low bits aren't very
# useful for detection anyway.
@@ -3864,23 +3873,38 @@ sub lm75_detect
my $i;
my $cur = i2c_smbus_read_byte_data($file, 0x00);
my $conf = i2c_smbus_read_byte_data($file, 0x01);
my ($maxreg, $hyst, $os, $dev_id);
my $hyst = i2c_smbus_read_byte_data($file, 0x02, NO_CACHE);
my $maxreg = $chip == 1 ? 0x0f : 0x07;
for $i (0x04 .. $maxreg) {
return if i2c_smbus_read_byte_data($file, $i, NO_CACHE) != $hyst;
if ($chip == 2) { # LM75A
$dev_id = i2c_smbus_read_byte_data($file, 0x07);
return if $dev_id != 0xA1;
$hyst = i2c_smbus_read_byte_data($file, 0x02);
$os = i2c_smbus_read_byte_data($file, 0x03);
for $i (0x04 .. 0x06) {
return if i2c_smbus_read_byte_data($file, $i) != 0xff;
}
} else { # LM75 or DS75
$maxreg = $chip == 1 ? 0x0f : 0x07;
$hyst = i2c_smbus_read_byte_data($file, 0x02, NO_CACHE);
for $i (0x04 .. $maxreg) {
return if i2c_smbus_read_byte_data($file, $i, NO_CACHE) != $hyst;
}
$os = i2c_smbus_read_byte_data($file, 0x03, NO_CACHE);
for $i (0x04 .. $maxreg) {
return if i2c_smbus_read_byte_data($file, $i, NO_CACHE) != $os;
}
}
my $os = i2c_smbus_read_byte_data($file, 0x03, NO_CACHE);
for $i (0x04 .. $maxreg) {
return if i2c_smbus_read_byte_data($file, $i, NO_CACHE) != $os;
}
if ($chip == 0) {
if ($chip != 1) { # LM75 or LM75A
for ($i = 8; $i <= 248; $i += 40) {
return if i2c_smbus_read_byte_data($file, $i + 0x01) != $conf
or i2c_smbus_read_byte_data($file, $i + 0x02) != $hyst
or i2c_smbus_read_byte_data($file, $i + 0x03) != $os;
return if $chip == 2
and i2c_smbus_read_byte_data($file, $i + 0x07) != $dev_id;
}
}
@@ -3888,7 +3912,7 @@ sub lm75_detect
return if $conf == $cur and $cur == $hyst and $cur == $os;
# Unused bits
return if $chip == 0 and ($conf & 0xe0);
return if $chip != 1 and ($conf & 0xe0);
return if $chip == 1 and ($conf & 0x80);
# Most probable value ranges