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xianfeng |
Kernel driver smsc47m1
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======================
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Supported chips:
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* SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
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LPC47M15x and LPC47M192
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Addresses scanned: none, address read from Super I/O config space
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Prefix: 'smsc47m1'
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Datasheets:
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http://www.smsc.com/main/datasheets/47b27x.pdf
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http://www.smsc.com/main/datasheets/47m10x.pdf
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http://www.smsc.com/main/datasheets/47m112.pdf
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http://www.smsc.com/main/tools/discontinued/47m13x.pdf
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http://www.smsc.com/main/datasheets/47m14x.pdf
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http://www.smsc.com/main/tools/discontinued/47m15x.pdf
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http://www.smsc.com/main/datasheets/47m192.pdf
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* SMSC LPC47M292
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Addresses scanned: none, address read from Super I/O config space
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Prefix: 'smsc47m2'
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Datasheet: Not public
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* SMSC LPC47M997
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Addresses scanned: none, address read from Super I/O config space
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Prefix: 'smsc47m1'
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Datasheet: none
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Authors:
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Mark D. Studebaker ,
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With assistance from Bruce Allen , and his
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fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
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Gabriele Gorla ,
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Jean Delvare
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Description
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-----------
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The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
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contain monitoring and PWM control circuitry for two fans.
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The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
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monitoring block' in addition to the fan monitoring and control. The
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hardware monitoring block is not supported by this driver, use the
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smsc47m192 driver for that.
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No documentation is available for the 47M997, but it has the same device
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ID as the 47M15x and 47M192 chips and seems to be compatible.
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Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
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triggered if the rotation speed has dropped below a programmable limit. Fan
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readings can be divided by a programmable divider (1, 2, 4 or 8) to give
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the readings more range or accuracy. Not all RPM values can accurately be
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represented, so some rounding is done. With a divider of 2, the lowest
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representable value is around 2600 RPM.
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PWM values are from 0 to 255.
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If an alarm triggers, it will remain triggered until the hardware register
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is read at least once. This means that the cause for the alarm may
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already have disappeared! Note that in the current implementation, all
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hardware registers are read whenever any data is read (unless it is less
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than 1.5 seconds since the last update). This means that you can easily
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miss once-only alarms.
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**********************
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The lm_sensors project gratefully acknowledges the support of
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Intel in the development of this driver.
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