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
Thelm driver provides support for the National
Semiconductor LM series hardware monitors and register compatible chips to be
used with the envsys(4) API.
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 |
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.
- Nuvoton NCT5104D, NCT6775F, NCT6776F, NCT6102D, NCT6104D, NCT6106D, NCT6779D, NCT6791D, NCT6792D, NCT6793D, NCT6795D, and NCT6796D.
- 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
HISTORY
The lm device appeared in
NetBSD 1.5.
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.