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Documentation/hwmon/pc87427.rst
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Kernel driver pc87427 ===================== 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 <jdelvare@suse.de> |
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Thanks to Amir Habibi at Candelis for setting up a test system, and to Michael Kress for testing several iterations of this driver. Description ----------- The National Semiconductor Super I/O chip includes complete hardware monitoring capabilities. It can monitor up to 18 voltages, 8 fans and |
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6 temperature sensors. Only the fans and temperatures are supported at the moment, voltages aren't. |
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This chip also has fan controlling features (up to 4 PWM outputs), which are partly supported by this driver. |
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The driver assumes that no more than one chip is present, which seems reasonable. Fan Monitoring -------------- Fan rotation speeds are reported as 14-bit values from a gated clock signal. Speeds down to 83 RPM can be measured. 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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Fan Speed Control ----------------- Fan speed can be controlled by PWM outputs. There are 4 possible modes: always off, always on, manual and automatic. The latter isn't supported by the driver: you can only return to that mode if it was the original setting, and the configuration interface is missing. |
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Temperature Monitoring ---------------------- The PC87427 relies on external sensors (following the SensorPath standard), so the resolution and range depend on the type of sensor connected. The integer part can be 8-bit or 9-bit, and can be signed or not. I couldn't find a way to figure out the external sensor data temperature format, so user-space adjustment (typically by a factor 2) may be required. |