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hwmon: (pc87427) Add support for manual fan speed control

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Add initial support for PWM outputs of the PC87427 Super-I/O chip.
Only mode change and manual fan speed control are supported. Automatic
mode configuration isn't supported, and won't be until at least one
board is known, which makes uses of the PWM outputs.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Jean Delvare
2010-08-14 21:08:58 +02:00
parent 0d22d5835d
commit 328716bc16
3 changed files with 282 additions and 5 deletions
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13
Documentation/hwmon/pc87427
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@@ -20,8 +20,8 @@ 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 are supported at the moment.
This chip also has fan controlling features, which are not yet supported
by this driver either.
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.
@@ -36,3 +36,12 @@ 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.