Based on kernel version 2.6.26. Page generated on 2008-07-16 21:12 EST.
1 Kernel driver pc87427 2 ===================== 3 4 Supported chips: 5 * National Semiconductor PC87427 6 Prefix: 'pc87427' 7 Addresses scanned: none, address read from Super I/O config space 8 Datasheet: http://www.winbond.com.tw/E-WINBONDHTM/partner/apc_007.html 9 10 Author: Jean Delvare <khali[AT]linux-fr[DOT]org> 11 12 Thanks to Amir Habibi at Candelis for setting up a test system, and to 13 Michael Kress for testing several iterations of this driver. 14 15 16 Description 17 ----------- 18 19 The National Semiconductor Super I/O chip includes complete hardware 20 monitoring capabilities. It can monitor up to 18 voltages, 8 fans and 21 6 temperature sensors. Only the fans are supported at the moment. 22 23 This chip also has fan controlling features, which are not yet supported 24 by this driver either. 25 26 The driver assumes that no more than one chip is present, which seems 27 reasonable. 28 29 30 Fan Monitoring 31 -------------- 32 33 Fan rotation speeds are reported as 14-bit values from a gated clock 34 signal. Speeds down to 83 RPM can be measured. 35 36 An alarm is triggered if the rotation speed drops below a programmable 37 limit. Another alarm is triggered if the speed is too low to to be measured 38 (including stalled or missing fan).