LM(4)

LM(4) | Kernel Interfaces Manual | LM(4)

# NAME

lm — National Semiconductor LM78, LM79 and compatible hardware monitors

# SYNOPSIS

lm0 at isa? port 0x280 flags 0x00
lm1 at isa? port 0x290 flags 0x00
lm2 at isa? port 0x310 flags 0x00
lm3 at isa? port 0xa00 flags 0x00
lm0 at pnpbios0 index ? flags 0x00
lm0 at iic? addr 0x2e flags 0x00
lm* at wbsio?

# DESCRIPTION

The lm driver provides support for the National Semiconductor LM series hardware monitors and register compatible chips to be used with the envsys(4) API.

Most supported devices possess 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 some devices (most Winbond devices) sensor names and numbers will be different.

Due to hardware limitations, fresh sensor data is only available every 2 seconds.

# HARDWARE

Chips supported by the lm driver include:

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

For most of the Winbond chips (identified with a * above), the flags configuration option can be specified to select the type of temperature sensor:

flags | Sensor Type
`0` | Thermistor diode (Power-On default)
`1` | Pentium-II diode
`2` | 2N3904 Bipolar
`4` | Thermistor diode

# SEE ALSO

envsys(4), wbsio(4), envstat(8)

# HISTORY

The lm device appeared in NetBSD 1.5.

# BUGS

Interrupt support is unimplemented.

There are currently no known pnpbios IDs assigned to LM chips.

February 16, 2010 | NetBSD 7.0