it87 6.4 KB

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  1. Kernel driver it87
  2. ==================
  3. Supported chips:
  4. * IT8705F
  5. Prefix: 'it87'
  6. Addresses scanned: from Super I/O config space (8 I/O ports)
  7. Datasheet: Publicly available at the ITE website
  8. http://www.ite.com.tw/
  9. * IT8712F
  10. Prefix: 'it8712'
  11. Addresses scanned: from Super I/O config space (8 I/O ports)
  12. Datasheet: Publicly available at the ITE website
  13. http://www.ite.com.tw/
  14. * IT8716F
  15. Prefix: 'it8716'
  16. Addresses scanned: from Super I/O config space (8 I/O ports)
  17. Datasheet: Publicly available at the ITE website
  18. http://www.ite.com.tw/product_info/file/pc/IT8716F_V0.3.ZIP
  19. * IT8718F
  20. Prefix: 'it8718'
  21. Addresses scanned: from Super I/O config space (8 I/O ports)
  22. Datasheet: Publicly available at the ITE website
  23. http://www.ite.com.tw/product_info/file/pc/IT8718F_V0.2.zip
  24. http://www.ite.com.tw/product_info/file/pc/IT8718F_V0%203_(for%20C%20version).zip
  25. * SiS950 [clone of IT8705F]
  26. Prefix: 'it87'
  27. Addresses scanned: from Super I/O config space (8 I/O ports)
  28. Datasheet: No longer be available
  29. Authors:
  30. Christophe Gauthron <chrisg@0-in.com>
  31. Jean Delvare <khali@linux-fr.org>
  32. Module Parameters
  33. -----------------
  34. * update_vbat: int
  35. 0 if vbat should report power on value, 1 if vbat should be updated after
  36. each read. Default is 0. On some boards the battery voltage is provided
  37. by either the battery or the onboard power supply. Only the first reading
  38. at power on will be the actual battery voltage (which the chip does
  39. automatically). On other boards the battery voltage is always fed to
  40. the chip so can be read at any time. Excessive reading may decrease
  41. battery life but no information is given in the datasheet.
  42. * fix_pwm_polarity int
  43. Force PWM polarity to active high (DANGEROUS). Some chips are
  44. misconfigured by BIOS - PWM values would be inverted. This option tries
  45. to fix this. Please contact your BIOS manufacturer and ask him for fix.
  46. Hardware Interfaces
  47. -------------------
  48. All the chips suported by this driver are LPC Super-I/O chips, accessed
  49. through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an
  50. SMBus interface to the hardware monitoring functions. This driver no
  51. longer supports this interface though, as it is slower and less reliable
  52. than the ISA access, and was only available on a small number of
  53. motherboard models.
  54. Description
  55. -----------
  56. This driver implements support for the IT8705F, IT8712F, IT8716F,
  57. IT8718F and SiS950 chips.
  58. These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
  59. joysticks and other miscellaneous stuff. For hardware monitoring, they
  60. include an 'environment controller' with 3 temperature sensors, 3 fan
  61. rotation speed sensors, 8 voltage sensors, and associated alarms.
  62. The IT8712F and IT8716F additionally feature VID inputs, used to report
  63. the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
  64. the IT8716F and late IT8712F have 6. They are shared with other functions
  65. though, so the functionality may not be available on a given system.
  66. The driver dumbly assume it is there.
  67. The IT8718F also features VID inputs (up to 8 pins) but the value is
  68. stored in the Super-I/O configuration space. Due to technical limitations,
  69. this value can currently only be read once at initialization time, so
  70. the driver won't notice and report changes in the VID value. The two
  71. upper VID bits share their pins with voltage inputs (in5 and in6) so you
  72. can't have both on a given board.
  73. The IT8716F, IT8718F and later IT8712F revisions have support for
  74. 2 additional fans. They are not yet supported by the driver.
  75. The IT8716F and IT8718F, and late IT8712F and IT8705F also have optional
  76. 16-bit tachometer counters for fans 1 to 3. This is better (no more fan
  77. clock divider mess) but not compatible with the older chips and
  78. revisions. For now, the driver only uses the 16-bit mode on the
  79. IT8716F and IT8718F.
  80. Temperatures are measured in degrees Celsius. An alarm is triggered once
  81. when the Overtemperature Shutdown limit is crossed.
  82. Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
  83. triggered if the rotation speed has dropped below a programmable limit. When
  84. 16-bit tachometer counters aren't used, fan readings can be divided by
  85. a programmable divider (1, 2, 4 or 8) to give the readings more range or
  86. accuracy. With a divider of 2, the lowest representable value is around
  87. 2600 RPM. Not all RPM values can accurately be represented, so some rounding
  88. is done.
  89. Voltage sensors (also known as IN sensors) report their values in volts. An
  90. alarm is triggered if the voltage has crossed a programmable minimum or
  91. maximum limit. Note that minimum in this case always means 'closest to
  92. zero'; this is important for negative voltage measurements. All voltage
  93. inputs can measure voltages between 0 and 4.08 volts, with a resolution of
  94. 0.016 volt. The battery voltage in8 does not have limit registers.
  95. The VID lines (IT8712F/IT8716F/IT8718F) encode the core voltage value:
  96. the voltage level your processor should work with. This is hardcoded by
  97. the mainboard and/or processor itself. It is a value in volts.
  98. If an alarm triggers, it will remain triggered until the hardware register
  99. is read at least once. This means that the cause for the alarm may already
  100. have disappeared! Note that in the current implementation, all hardware
  101. registers are read whenever any data is read (unless it is less than 1.5
  102. seconds since the last update). This means that you can easily miss
  103. once-only alarms.
  104. The IT87xx only updates its values each 1.5 seconds; reading it more often
  105. will do no harm, but will return 'old' values.
  106. To change sensor N to a thermistor, 'echo 2 > tempN_type' where N is 1, 2,
  107. or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
  108. Give 0 for unused sensor. Any other value is invalid. To configure this at
  109. startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor;
  110. 3 = thermal diode)
  111. Fan speed control
  112. -----------------
  113. The fan speed control features are limited to manual PWM mode. Automatic
  114. "Smart Guardian" mode control handling is not implemented. However
  115. if you want to go for "manual mode" just write 1 to pwmN_enable.
  116. If you are only able to control the fan speed with very small PWM values,
  117. try lowering the PWM base frequency (pwm1_freq). Depending on the fan,
  118. it may give you a somewhat greater control range. The same frequency is
  119. used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are
  120. read-only.