kernel-ark/Documentation/i2c/busses/i2c-viapro
Jean Delvare 8750197f0e [PATCH] i2c-viapro: Some adjustments
The big i2c-viapro SMBus driver update which went into 2.6.14-git1
introduced a few minor issues. Nothing critical, but I would like a
few adjustments to be merged in to fix the following problems:

* VIA should not be spelled Via.
* Frodo Looijaard and Philip Edelbrock did not write the i2c-viapro
  driver.
* When debugging is disabled, half of messages would be logged.
* Drop an unneeded masking.
* Some port reads can be avoided now that the transaction size is
  passed as a parameter to vt596_transaction().
* SMBus Receive Byte transactions are used for probing too (for
  EEPROMs), so hide errors on these too.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-11-07 21:46:38 -08:00

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Kernel driver i2c-viapro
Supported adapters:
* VIA Technologies, Inc. VT82C596A/B
Datasheet: Sometimes available at the VIA website
* VIA Technologies, Inc. VT82C686A/B
Datasheet: Sometimes available at the VIA website
* VIA Technologies, Inc. VT8231, VT8233, VT8233A, VT8235, VT8237R
Datasheet: available on request from VIA
Authors:
Kyösti Mälkki <kmalkki@cc.hut.fi>,
Mark D. Studebaker <mdsxyz123@yahoo.com>,
Jean Delvare <khali@linux-fr.org>
Module Parameters
-----------------
* force: int
Forcibly enable the SMBus controller. DANGEROUS!
* force_addr: int
Forcibly enable the SMBus at the given address. EXTREMELY DANGEROUS!
Description
-----------
i2c-viapro is a true SMBus host driver for motherboards with one of the
supported VIA south bridges.
Your lspci -n listing must show one of these :
device 1106:3050 (VT82C596A function 3)
device 1106:3051 (VT82C596B function 3)
device 1106:3057 (VT82C686 function 4)
device 1106:3074 (VT8233)
device 1106:3147 (VT8233A)
device 1106:8235 (VT8231 function 4)
device 1106:3177 (VT8235)
device 1106:3227 (VT8237R)
If none of these show up, you should look in the BIOS for settings like
enable ACPI / SMBus or even USB.
Except for the oldest chips (VT82C596A/B, VT82C686A and most probably
VT8231), this driver supports I2C block transactions. Such transactions
are mainly useful to read from and write to EEPROMs.