Documentation/hwmon/smsc47m1.rst

Source file repositories/reference/linux-study-clean/Documentation/hwmon/smsc47m1.rst

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Linux kernel
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Documentation/hwmon/smsc47m1.rst
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.rst
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Support Tooling And Documentation
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Documentation
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Support Tooling And Documentation: documentation
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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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Annotated Snippet

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/media/Downloads_Public/Data_Sheets/47b272.pdf

	http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf

	http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf

	http://www.smsc.com/

  * SMSC LPC47M292

    Addresses scanned: none, address read from Super I/O config space

    Prefix: 'smsc47m2'

    Datasheet: Not public

  * 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 <jdelvare@suse.de>

Description
-----------

The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
contain monitoring and PWM control circuitry for two fans.

The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
monitoring block' in addition to the fan monitoring and control. The
hardware monitoring block is not supported by this driver, use the
smsc47m192 driver for that.

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

Annotation

Implementation Notes