Kernel driver `pc87360.o' ========================= Status: Alpha, untested. Supported chips: * National Semiconductor PC87360, PC87363, PC87364, PC87365 and PC87366 Addresses scanned: none, address read from Super I/O config space Datasheets: http://www.national.com/pf/PC/PC87360.html http://www.national.com/pf/PC/PC87363.html http://www.national.com/pf/PC/PC87364.html http://www.national.com/pf/PC/PC87365.html http://www.national.com/pf/PC/PC87366.html Authors: Jean Delvare Module Parameters ----------------- None. Description ----------- The National Semiconductor PC87360 Super I/O chip contains monitoring and PWM control circuitry for two fans. The PC87363 chip is similar, and the PC87364 chip has monitoring and PWM control for a third fan. The National Semiconductor PC87365 and PC87366 Super I/O chips are complete hardware monitoring chipsets, not only controling and monitoring three fans, but also monitoring eleven voltage inputs and two (PC87365) or three (PC87366) remote temperatures. Fan rotation speeds are reported in RPM (revolutions per minute). An alarm is triggered if the rotation speed has dropped below a programmable limit. Fan readings can be divided by a programmable divider (1, 2, 4 or 8) to give the readings more range or accuracy. Not all RPM values can accurately be represented, so some rounding is done. With a divider of 2, the lowest representable value is around 950 RPM. See doc/fan-divisors for details. A different alarm is also triggered if the fan speed is too low to be measured. It is suggested to increase the fan divisor in this case. PWM values are from 0 to 255. Temperatures are reported in degrees Celcius. Each temperature measured has associated low, limit and overtemperature limits, each of which triggers an alarm when crossed. The first two temperature channels are external. The third one (PC87366 only) is internal. Voltages are reported relatively to a reference voltage, either internal or external. Some of them are divided by two internally, you will have to compensate in sensors.conf. Each voltage measured has associated low and high limit, each of which triggers an alarm when crossed. If an alarm triggers, it will remain triggered until the hardware register is read at least once. This means that the cause for the alarm may already have disappeared! Note that in the current implementation, all hardware registers are read whenever any data is read (unless it is less than 1.5 seconds since the last update). This means that you can easily miss once-only alarms. Limitations ----------- There are a few unimplemented configuration options at the moment. We'll add them if someone needs them. The datasheets suggests that some values (fan mins, fan divisors) shouldn't be changed once the monitoring has started, but we ignore that recommendation. We'll reconsider if it actually causes trouble.