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LM(4) Device Drivers 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. 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. 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 envsys(4), wbsio(4), envstat(8) 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. NetBSD 8.99.34 March 8, 2018 NetBSD 8.99.34