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smsc47m1

smsc47m1 2.5 KB
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  1. Kernel driver smsc47m1
    2. 

  2. ======================
    3. 

  3. 

  4. Supported chips:
    5. 

  5.   * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
    6. 

  6.     LPC47M15x and LPC47M192
    7. 

  7.     Addresses scanned: none, address read from Super I/O config space
    8. 

  8.     Prefix: 'smsc47m1'
    9. 

  9.     Datasheets:
    10. 

  10.         http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf
    11. 

  11.         http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf
    12. 

  12.         http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf
    13. 

  13.         http://www.smsc.com/
    14. 

  14.   * SMSC LPC47M292
    15. 

  15.     Addresses scanned: none, address read from Super I/O config space
    16. 

  16.     Prefix: 'smsc47m2'
    17. 

  17.     Datasheet: Not public
    18. 

  18.   * SMSC LPC47M997
    19. 

  19.     Addresses scanned: none, address read from Super I/O config space
    20. 

  20.     Prefix: 'smsc47m1'
    21. 

  21.     Datasheet: none
    22. 

  22. 

  23. Authors:
    24. 

  24.         Mark D. Studebaker <mdsxyz123@yahoo.com>,
    25. 

  25.         With assistance from Bruce Allen <ballen@uwm.edu>, and his
    26. 

  26.         fan.c program: http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
    27. 

  27.         Gabriele Gorla <gorlik@yahoo.com>,
    28. 

  28.         Jean Delvare <jdelvare@suse.de>
    29. 

  29. 

  30. Description
    31. 

  31. -----------
    32. 

  32. 

  33. The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
    34. 

  34. contain monitoring and PWM control circuitry for two fans.
    35. 

  35. 

  36. The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
    37. 

  37. monitoring block' in addition to the fan monitoring and control. The
    38. 

  38. hardware monitoring block is not supported by this driver, use the
    39. 

  39. smsc47m192 driver for that.
    40. 

  40. 

  41. No documentation is available for the 47M997, but it has the same device
    42. 

  42. ID as the 47M15x and 47M192 chips and seems to be compatible.
    43. 

  43. 

  44. Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
    45. 

  45. triggered if the rotation speed has dropped below a programmable limit. Fan
    46. 

  46. readings can be divided by a programmable divider (1, 2, 4 or 8) to give
    47. 

  47. the readings more range or accuracy. Not all RPM values can accurately be
    48. 

  48. represented, so some rounding is done. With a divider of 2, the lowest
    49. 

  49. representable value is around 2600 RPM.
    50. 

  50. 

  51. PWM values are from 0 to 255.
    52. 

  52. 

  53. If an alarm triggers, it will remain triggered until the hardware register
    54. 

  54. is read at least once. This means that the cause for the alarm may
    55. 

  55. already have disappeared! Note that in the current implementation, all
    56. 

  56. hardware registers are read whenever any data is read (unless it is less
    57. 

  57. than 1.5 seconds since the last update). This means that you can easily
    58. 

  58. miss once-only alarms.
    59. 

  59. 

  60. 

  61. **********************
    62. 

  62. The lm_sensors project gratefully acknowledges the support of
    63. 

  63. Intel in the development of this driver.
    64.