ba224e2c4f
This is a new hardware monitoring driver for the National Semiconductor PC87427 Super-I/O chip. It only supports fan speed monitoring for now, while the chip can do much more. Thanks to Amir Habibi at Candelis for setting up a test system, and to Michael Kress for testing several iterations of this driver. Signed-off-by: Jean Delvare <khali@linux-fr.org>
1.2 KiB
Kernel driver pc87427
Supported chips:
- National Semiconductor PC87427 Prefix: 'pc87427' Addresses scanned: none, address read from Super I/O config space Datasheet: http://www.winbond.com.tw/E-WINBONDHTM/partner/apc_007.html
Author: Jean Delvare khali@linux-fr.org
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 are supported at the moment.
This chip also has fan controlling features, which are not yet supported by this driver either.
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 to be measured (including stalled or missing fan).