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- Kernel driver smsc47m1
- ======================
- Supported chips:
- * SMSC LPC47B27x, 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/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
- 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.
- 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.
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