Kernel driver smsc47m1 ====================== Supported chips: * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x, LPC47M15x and LPC47M192 Addresses scanned: none, address read from Super I/O config space Prefix: 'smsc47m1' Datasheets: http://www.smsc.com/main/datasheets/47b27x.pdf http://www.smsc.com/main/datasheets/47m10x.pdf http://www.smsc.com/main/datasheets/47m112.pdf http://www.smsc.com/main/tools/discontinued/47m13x.pdf http://www.smsc.com/main/datasheets/47m14x.pdf http://www.smsc.com/main/tools/discontinued/47m15x.pdf http://www.smsc.com/main/datasheets/47m192.pdf * SMSC LPC47M997 Addresses scanned: none, address read from Super I/O config space Prefix: 'smsc47m1' Datasheet: none Authors: Mark D. Studebaker <mdsxyz123@yahoo.com>, With assistance from Bruce Allen <ballen@uwm.edu>, and his fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ Gabriele Gorla <gorlik@yahoo.com>, Jean Delvare <khali@linux-fr.org> Description ----------- The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips contain monitoring and PWM control circuitry for two fans. The 47M15x and 47M192 chips contain a full 'hardware monitoring block' in addition to the fan monitoring and control. The hardware monitoring block is not supported by the driver. No documentation is available for the 47M997, but it has the same device ID as the 47M15x and 47M192 chips and seems to be compatible. Fan rotation speeds are reported in RPM (rotations 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 2600 RPM. PWM values are from 0 to 255. 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. ********************** The lm_sensors project gratefully acknowledges the support of Intel in the development of this driver.