LMENV(4) | Device Drivers Manual | LMENV(4)

# NAME

`lmenv` —
National Semiconductor LM81, LM87, and compatible hardware monitors

# SYNOPSIS

`lmenv0 at iic0 addr 0x2c: ADM9240 rev 2`

# DESCRIPTION

The `lmenv` driver provides support for the National Semiconductor LM87, National Semiconductor LM81, Analog Devices ADM9240, and Dallas Semiconductor DS1780 iicbus hardware monitors. Sensor values are reported through the envstat(8) interface.

The `lmenv` supports the following voltage, temperature, and fan speed sensors:

Sensor | Type
`+2.5Vin` | Volts DC
`Vccp1` | Volts DC
`+Vcc` | Volts DC
`+5Vin/Vcc` | Volts DC
`+12Vin` | Volts DC
`Vccp2` | Volts DC
`External` | Temperature
`Internal` | Temperature
`FAN1` | Speed
`FAN2` | Speed

On the LM87 monitor, AIN1 and AIN2 Volts DC sensors may replace either, or both of the FAN1 and FAN2 speed sensors, respectively.

# SEE ALSO

envsys(4), envstat(8)

# HISTORY

The `lmenv` driver first appeared in OpenBSD 3.9. NetBSD support was added in NetBSD 7.0.

# AUTHORS

The `lmenv` driver was written for OpenBSD by Mark Kettenis ⟨kettenis@openbsd.org⟩, and ported to NetBSD by
Julian Coleman ⟨jdc@NetBSD.org⟩.

# BUGS

High and low sensor limits are not supported.

Interrupt support is not implemented.

October 14, 2013 | NetBSD 9.5