linux/Documentation/hwmon/w83627hf
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   1Kernel driver w83627hf
   2======================
   3
   4Supported chips:
   5  * Winbond W83627HF (ISA accesses ONLY)
   6    Prefix: 'w83627hf'
   7    Addresses scanned: ISA address retrieved from Super I/O registers
   8  * Winbond W83627THF
   9    Prefix: 'w83627thf'
  10    Addresses scanned: ISA address retrieved from Super I/O registers
  11  * Winbond W83697HF
  12    Prefix: 'w83697hf'
  13    Addresses scanned: ISA address retrieved from Super I/O registers
  14  * Winbond W83637HF
  15    Prefix: 'w83637hf'
  16    Addresses scanned: ISA address retrieved from Super I/O registers
  17  * Winbond W83687THF
  18    Prefix: 'w83687thf'
  19    Addresses scanned: ISA address retrieved from Super I/O registers
  20    Datasheet: Provided by Winbond on request(http://www.winbond.com/hq/enu)
  21
  22Authors:
  23        Frodo Looijaard <frodol@dds.nl>,
  24        Philip Edelbrock <phil@netroedge.com>,
  25        Mark Studebaker <mdsxyz123@yahoo.com>,
  26        Bernhard C. Schrenk <clemy@clemy.org>
  27
  28Module Parameters
  29-----------------
  30
  31* force_i2c: int
  32  Initialize the I2C address of the sensors
  33* init: int
  34  (default is 1)
  35  Use 'init=0' to bypass initializing the chip.
  36  Try this if your computer crashes when you load the module.
  37
  38Description
  39-----------
  40
  41This driver implements support for ISA accesses *only* for
  42the Winbond W83627HF, W83627THF, W83697HF and W83637HF Super I/O chips.
  43We will refer to them collectively as Winbond chips.
  44
  45This driver supports ISA accesses, which should be more reliable
  46than i2c accesses. Also, for Tyan boards which contain both a
  47Super I/O chip and a second i2c-only Winbond chip (often a W83782D),
  48using this driver will avoid i2c address conflicts and complex
  49initialization that were required in the w83781d driver.
  50
  51If you really want i2c accesses for these Super I/O chips,
  52use the w83781d driver. However this is not the preferred method
  53now that this ISA driver has been developed.
  54
  55The w83627_HF_ uses pins 110-106 as VID0-VID4. The w83627_THF_ uses the
  56same pins as GPIO[0:4]. Technically, the w83627_THF_ does not support a
  57VID reading. However the two chips have the identical 128 pin package. So,
  58it is possible or even likely for a w83627thf to have the VID signals routed
  59to these pins despite their not being labeled for that purpose. Therefore,
  60the w83627thf driver interprets these as VID. If the VID on your board
  61doesn't work, first see doc/vid in the lm_sensors package[1]. If that still
  62doesn't help, you may just ignore the bogus VID reading with no harm done.
  63
  64For further information on this driver see the w83781d driver documentation.
  65
  66[1] http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/vid
  67
  68Forcing the address
  69-------------------
  70
  71The driver used to have a module parameter named force_addr, which could
  72be used to force the base I/O address of the hardware monitoring block.
  73This was meant as a workaround for mainboards with a broken BIOS. This
  74module parameter is gone for technical reasons. If you need this feature,
  75you can obtain the same result by using the isaset tool (part of
  76lm-sensors) before loading the driver:
  77
  78# Enter the Super I/O config space
  79isaset -y -f 0x2e 0x87
  80isaset -y -f 0x2e 0x87
  81
  82# Select the hwmon logical device
  83isaset -y 0x2e 0x2f 0x07 0x0b
  84
  85# Set the base I/O address (to 0x290 in this example)
  86isaset -y 0x2e 0x2f 0x60 0x02
  87isaset -y 0x2e 0x2f 0x61 0x90
  88
  89# Exit the Super-I/O config space
  90isaset -y -f 0x2e 0xaa
  91
  92The above sequence assumes a Super-I/O config space at 0x2e/0x2f, but
  930x4e/0x4f is also possible.
  94
  95Voltage pin mapping
  96-------------------
  97
  98Here is a summary of the voltage pin mapping for the W83627THF. This
  99can be useful to convert data provided by board manufacturers into
 100working libsensors configuration statements.
 101
 102    W83627THF           |
 103  Pin   | Name          | Register      | Sysfs attribute
 104-----------------------------------------------------
 105  100   | CPUVCORE      | 20h           | in0
 106   99   | VIN0          | 21h           | in1
 107   98   | VIN1          | 22h           | in2
 108   97   | VIN2          | 24h           | in4
 109  114   | AVCC          | 23h           | in3
 110   61   | 5VSB          | 50h (bank 5)  | in7
 111   74   | VBAT          | 51h (bank 5)  | in8
 112
 113For other supported devices, you'll have to take the hard path and
 114look up the information in the datasheet yourself (and then add it
 115to this document please.)
 116
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