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Kernel driver pc87427
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=====================
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Supported chips:
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* National Semiconductor PC87427
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Prefix: 'pc87427'
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Addresses scanned: none, address read from Super I/O config space
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Datasheet: No longer available
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Author: Jean Delvare <khali@linux-fr.org>
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Thanks to Amir Habibi at Candelis for setting up a test system, and to
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Michael Kress for testing several iterations of this driver.
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Description
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-----------
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The National Semiconductor Super I/O chip includes complete hardware
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monitoring capabilities. It can monitor up to 18 voltages, 8 fans and
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6 temperature sensors. Only the fans are supported at the moment.
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This chip also has fan controlling features, which are not yet supported
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by this driver either.
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The driver assumes that no more than one chip is present, which seems
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reasonable.
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Fan Monitoring
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--------------
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Fan rotation speeds are reported as 14-bit values from a gated clock
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signal. Speeds down to 83 RPM can be measured.
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An alarm is triggered if the rotation speed drops below a programmable
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limit. Another alarm is triggered if the speed is too low to be measured
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(including stalled or missing fan).
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