lm —
National Semiconductor LM78/79/81 temperature,
voltage, and fan sensor
lm0 at isa? port 0x290
lm1 at isa? port 0x280
lm2 at isa? port 0x310
lm* at iic?
lm* at wbsio?
The
lm driver provides support for the
National Semiconductor LM78/79/81 hardware monitors and register compatible
chips to be used with the
sysctl(8) interface.
The original LM78 hardware monitor supports 11 sensors:
| Sensor |
Units |
Typical Use |
IN0 |
uV DC |
Core voltage |
IN1 |
uV DC |
Unknown |
IN2 |
uV DC |
+3.3V |
IN3 |
uV DC |
+5V |
IN4 |
uV DC |
+12V |
IN5 |
uV DC |
-12V |
IN6 |
uV DC |
-5V |
Temp |
uK |
Motherboard Temperature |
Fan0 |
RPM |
Fan |
Fan1 |
RPM |
Chassis Fan |
Fan2 |
RPM |
Fan |
For other devices, sensors' names and numbers will be different.
Chips supported by the
lm driver include:
- ASUS AS99127F
- National Semiconductor LM78 and LM78-J
- National Semiconductor LM79
- National Semiconductor LM81
- Nuvoton NCT6776F
- Winbond W83627HF, W83627THF, W83637HF and W83697HF
- Winbond W83627DHG, W83627UHG and W83627EHF
- Winbond W83781D, W83782D and W83783S
- Winbond W83791D, W83791SD and W83792D
Some devices can attach to both
iic(4) and
isa(4); others can only attach to
either one or the other. If the
lm driver
detects a device attaching to both
iic(4) and
isa(4), it will detach the device
from
iic(4).
iic(4),
isa(4),
wbsio(4),
sensorsd(8),
sysctl(8)
The
lm driver first appeared in
NetBSD 1.5;
OpenBSD support
was added in
OpenBSD 3.4.
The
lm driver was written by
Bill Squier and ported to
OpenBSD 3.4 by
Alexander
Yurchenko
<
grange@openbsd.org>.
The driver was largely rewritten for
OpenBSD 3.9 by
Mark Kettenis
<
kettenis@openbsd.org>.
Some vendors connect these chips to non-standard thermal diodes and resistors.
This will result in bogus sensor values.
Interrupt support is unimplemented.
There are currently no known pnpbios IDs assigned to LM chips.
This driver attaches to the Winbond W83791SD chip even though that chip does not
have any sensors.
![[OpenBSD]](/openbsd.gif){kind=small}