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Diffstat (limited to 'Documentation/hwmon/pc87427')
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diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427 deleted file mode 100644 index c313eb66e08a..000000000000 --- a/Documentation/hwmon/pc87427 +++ /dev/null @@ -1,59 +0,0 @@ -Kernel driver pc87427 -===================== - -Supported chips: - * National Semiconductor PC87427 - Prefix: 'pc87427' - Addresses scanned: none, address read from Super I/O config space - Datasheet: No longer available - -Author: Jean Delvare <jdelvare@suse.de> - -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 -6 temperature sensors. Only the fans and temperatures are supported at -the moment, voltages aren't. - -This chip also has fan controlling features (up to 4 PWM outputs), -which are partly supported by this driver. - -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 -limit. Another alarm is triggered if the speed is too low to be measured -(including stalled or missing fan). - - -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. - - -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. |