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This module parameter is there to workaround broken BIOS. I'm not even sure if it was used in the past 5 years, and it gets in the way of converting the driver to the MFD infrastructure. So tell the users how they can do the same from user-space. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Rodolfo Giometti <giometti@linux.it>
97 lines
3.6 KiB
Text
97 lines
3.6 KiB
Text
Kernel driver w83627hf
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======================
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Supported chips:
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* Winbond W83627HF (ISA accesses ONLY)
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Prefix: 'w83627hf'
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Addresses scanned: ISA address retrieved from Super I/O registers
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Datasheet: http://www.winbond.com/PDF/sheet/w83627hf.pdf
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* Winbond W83627THF
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Prefix: 'w83627thf'
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Addresses scanned: ISA address retrieved from Super I/O registers
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Datasheet: http://www.winbond.com/PDF/sheet/w83627thf.pdf
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* Winbond W83697HF
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Prefix: 'w83697hf'
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Addresses scanned: ISA address retrieved from Super I/O registers
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Datasheet: http://www.winbond.com/PDF/sheet/697hf.pdf
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* Winbond W83637HF
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Prefix: 'w83637hf'
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Addresses scanned: ISA address retrieved from Super I/O registers
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Datasheet: http://www.winbond.com/PDF/sheet/w83637hf.pdf
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* Winbond W83687THF
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Prefix: 'w83687thf'
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Addresses scanned: ISA address retrieved from Super I/O registers
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Datasheet: Provided by Winbond on request
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Authors:
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Frodo Looijaard <frodol@dds.nl>,
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Philip Edelbrock <phil@netroedge.com>,
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Mark Studebaker <mdsxyz123@yahoo.com>,
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Bernhard C. Schrenk <clemy@clemy.org>
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Module Parameters
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-----------------
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* force_i2c: int
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Initialize the I2C address of the sensors
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* init: int
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(default is 1)
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Use 'init=0' to bypass initializing the chip.
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Try this if your computer crashes when you load the module.
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Description
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-----------
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This driver implements support for ISA accesses *only* for
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the Winbond W83627HF, W83627THF, W83697HF and W83637HF Super I/O chips.
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We will refer to them collectively as Winbond chips.
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This driver supports ISA accesses, which should be more reliable
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than i2c accesses. Also, for Tyan boards which contain both a
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Super I/O chip and a second i2c-only Winbond chip (often a W83782D),
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using this driver will avoid i2c address conflicts and complex
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initialization that were required in the w83781d driver.
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If you really want i2c accesses for these Super I/O chips,
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use the w83781d driver. However this is not the preferred method
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now that this ISA driver has been developed.
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The w83627_HF_ uses pins 110-106 as VID0-VID4. The w83627_THF_ uses the
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same pins as GPIO[0:4]. Technically, the w83627_THF_ does not support a
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VID reading. However the two chips have the identical 128 pin package. So,
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it is possible or even likely for a w83627thf to have the VID signals routed
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to these pins despite their not being labeled for that purpose. Therefore,
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the w83627thf driver interprets these as VID. If the VID on your board
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doesn't work, first see doc/vid in the lm_sensors package[1]. If that still
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doesn't help, you may just ignore the bogus VID reading with no harm done.
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For further information on this driver see the w83781d driver documentation.
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[1] http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/vid
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Forcing the address
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-------------------
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The driver used to have a module parameter named force_addr, which could
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be used to force the base I/O address of the hardware monitoring block.
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This was meant as a workaround for mainboards with a broken BIOS. This
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module parameter is gone for technical reasons. If you need this feature,
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you can obtain the same result by using the isaset tool (part of
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lm-sensors) before loading the driver:
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# Enter the Super I/O config space
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isaset -y -f 0x2e 0x87
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isaset -y -f 0x2e 0x87
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# Select the hwmon logical device
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isaset -y 0x2e 0x2f 0x07 0x0b
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# Set the base I/O address (to 0x290 in this example)
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isaset -y 0x2e 0x2f 0x60 0x02
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isaset -y 0x2e 0x2f 0x61 0x90
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# Exit the Super-I/O config space
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isaset -y -f 0x2e 0xaa
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The above sequence assumes a Super-I/O config space at 0x2e/0x2f, but
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0x4e/0x4f is also possible.
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