LM(4)

NAME
lm - NatSemi LM78/79/81 and Winbond Super I/O Hardware Monitor

SYNOPSIS
device lm0 at isa? port 0x290
device lm1 at isa? port 0x280
device lm2 at isa? port 0x310

device wbsio0 at isa? port 0x2e
device wbsio1 at isa? port 0x4e
device lm#3 at wbsio?

DESCRIPTION
The lm driver provides support for the National Semiconductor LM 78/79/81 and Winbond Super I/O hardware monitors, and registers compatible chips under the HW_SENSORS sysctl(3) tree.

HARDWARE
Chips supported by the lm driver include:

-   National Semiconductor LM78 and LM78-J
-   National Semiconductor LM79
-   National Semiconductor LM81
-   Winbond W83627HF, W83627THF, W83637HF and W83697HF
-   Winbond W83627DHG and W83627EHF
-   Winbond W83781D, W83782D and W83783S
-   Winbond W83791D, W83791SD and W83792D
-   ASUS AS99127F

SEE ALSO
systat(1), sysctl(3), isa(4), wbsio(4), sensorsd(8), sysctl(8)

HISTORY
The lm driver first appeared in NetBSD 1.5, was ported to OpenBSD 3.4 and imported into DragonFly 1.11.

AUTHORS
-nosplit 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>. The driver was then ported to FreeBSD by Constantine A. Murenin <cnst@FreeBSD.org> as a part of a Google Summer of Code 2007 project.

CAVEATS
Some vendors connect these chips to non-standard thermal diodes and resistors. This will result in bogus sensor values.

BUGS
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.