w83793.rst 4.2 KB

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  1. Kernel driver w83793
  2. ====================
  3. Supported chips:
  4. * Winbond W83793G/W83793R
  5. Prefix: 'w83793'
  6. Addresses scanned: I2C 0x2c - 0x2f
  7. Datasheet: Still not published
  8. Authors:
  9. - Yuan Mu (Winbond Electronics)
  10. - Rudolf Marek <r.marek@assembler.cz>
  11. Module parameters
  12. -----------------
  13. * reset int
  14. (default 0)
  15. This parameter is not recommended, it will lose motherboard specific
  16. settings. Use 'reset=1' to reset the chip when loading this module.
  17. * force_subclients=bus,caddr,saddr1,saddr2
  18. This is used to force the i2c addresses for subclients of
  19. a certain chip. Typical usage is `force_subclients=0,0x2f,0x4a,0x4b`
  20. to force the subclients of chip 0x2f on bus 0 to i2c addresses
  21. 0x4a and 0x4b.
  22. Description
  23. -----------
  24. This driver implements support for Winbond W83793G/W83793R chips.
  25. * Exported features
  26. This driver exports 10 voltage sensors, up to 12 fan tachometer inputs,
  27. 6 remote temperatures, up to 8 sets of PWM fan controls, SmartFan
  28. (automatic fan speed control) on all temperature/PWM combinations, 2
  29. sets of 6-pin CPU VID input.
  30. * Sensor resolutions
  31. If your motherboard maker used the reference design, the resolution of
  32. voltage0-2 is 2mV, resolution of voltage3/4/5 is 16mV, 8mV for voltage6,
  33. 24mV for voltage7/8. Temp1-4 have a 0.25 degree Celsius resolution,
  34. temp5-6 have a 1 degree Celsiis resolution.
  35. * Temperature sensor types
  36. Temp1-4 have 2 possible types. It can be read from (and written to)
  37. temp[1-4]_type.
  38. - If the value is 3, it starts monitoring using a remote termal diode
  39. (default).
  40. - If the value is 6, it starts monitoring using the temperature sensor
  41. in Intel CPU and get result by PECI.
  42. Temp5-6 can be connected to external thermistors (value of
  43. temp[5-6]_type is 4).
  44. * Alarm mechanism
  45. For voltage sensors, an alarm triggers if the measured value is below
  46. the low voltage limit or over the high voltage limit.
  47. For temperature sensors, an alarm triggers if the measured value goes
  48. above the high temperature limit, and wears off only after the measured
  49. value drops below the hysteresis value.
  50. For fan sensors, an alarm triggers if the measured value is below the
  51. low speed limit.
  52. * SmartFan/PWM control
  53. If you want to set a pwm fan to manual mode, you just need to make sure it
  54. is not controlled by any temp channel, for example, you want to set fan1
  55. to manual mode, you need to check the value of temp[1-6]_fan_map, make
  56. sure bit 0 is cleared in the 6 values. And then set the pwm1 value to
  57. control the fan.
  58. Each temperature channel can control all the 8 PWM outputs (by setting the
  59. corresponding bit in tempX_fan_map), you can set the temperature channel
  60. mode using temp[1-6]_pwm_enable, 2 is Thermal Cruise mode and 3
  61. is the SmartFanII mode. Temperature channels will try to speed up or
  62. slow down all controlled fans, this means one fan can receive different
  63. PWM value requests from different temperature channels, but the chip
  64. will always pick the safest (max) PWM value for each fan.
  65. In Thermal Cruise mode, the chip attempts to keep the temperature at a
  66. predefined value, within a tolerance margin. So if tempX_input >
  67. thermal_cruiseX + toleranceX, the chip will increase the PWM value,
  68. if tempX_input < thermal_cruiseX - toleranceX, the chip will decrease
  69. the PWM value. If the temperature is within the tolerance range, the PWM
  70. value is left unchanged.
  71. SmartFanII works differently, you have to define up to 7 PWM, temperature
  72. trip points, defining a PWM/temperature curve which the chip will follow.
  73. While not fundamentally different from the Thermal Cruise mode, the
  74. implementation is quite different, giving you a finer-grained control.
  75. * Chassis
  76. If the case open alarm triggers, it will stay in this state unless cleared
  77. by writing 0 to the sysfs file "intrusion0_alarm".
  78. * VID and VRM
  79. The VRM version is detected automatically, don't modify the it unless you
  80. *do* know the cpu VRM version and it's not properly detected.
  81. Notes
  82. -----
  83. Only Fan1-5 and PWM1-3 are guaranteed to always exist, other fan inputs and
  84. PWM outputs may or may not exist depending on the chip pin configuration.