smsc47m1.rst 2.5 KB

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  1. Kernel driver smsc47m1
  2. ======================
  3. Supported chips:
  4. * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
  5. LPC47M15x and LPC47M192
  6. Addresses scanned: none, address read from Super I/O config space
  7. Prefix: 'smsc47m1'
  8. Datasheets:
  9. http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf
  10. http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf
  11. http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf
  12. http://www.smsc.com/
  13. * SMSC LPC47M292
  14. Addresses scanned: none, address read from Super I/O config space
  15. Prefix: 'smsc47m2'
  16. Datasheet: Not public
  17. * SMSC LPC47M997
  18. Addresses scanned: none, address read from Super I/O config space
  19. Prefix: 'smsc47m1'
  20. Datasheet: none
  21. Authors:
  22. - Mark D. Studebaker <mdsxyz123@yahoo.com>,
  23. - With assistance from Bruce Allen <ballen@uwm.edu>, and his
  24. fan.c program:
  25. - http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
  26. - Gabriele Gorla <gorlik@yahoo.com>,
  27. - Jean Delvare <jdelvare@suse.de>
  28. Description
  29. -----------
  30. The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
  31. contain monitoring and PWM control circuitry for two fans.
  32. The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
  33. monitoring block' in addition to the fan monitoring and control. The
  34. hardware monitoring block is not supported by this driver, use the
  35. smsc47m192 driver for that.
  36. No documentation is available for the 47M997, but it has the same device
  37. ID as the 47M15x and 47M192 chips and seems to be compatible.
  38. Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
  39. triggered if the rotation speed has dropped below a programmable limit. Fan
  40. readings can be divided by a programmable divider (1, 2, 4 or 8) to give
  41. the readings more range or accuracy. Not all RPM values can accurately be
  42. represented, so some rounding is done. With a divider of 2, the lowest
  43. representable value is around 2600 RPM.
  44. PWM values are from 0 to 255.
  45. If an alarm triggers, it will remain triggered until the hardware register
  46. is read at least once. This means that the cause for the alarm may
  47. already have disappeared! Note that in the current implementation, all
  48. hardware registers are read whenever any data is read (unless it is less
  49. than 1.5 seconds since the last update). This means that you can easily
  50. miss once-only alarms.
  51. ------------------------------------------------------------------
  52. The lm_sensors project gratefully acknowledges the support of
  53. Intel in the development of this driver.