pc87427 1.2 KB

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