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 Datasheet: available on request from VIA * VIA Technologies, Inc. VT8235, VT8237R, VT8237A, VT8237S, VT8251 Datasheet: available on request and under NDA from VIA * VIA Technologies, Inc. CX700 Datasheet: available on request and under NDA from VIA * VIA Technologies, Inc. VX800/VX820 Datasheet: available on http://linux.via.com.tw * VIA Technologies, Inc. VX855/VX875 Datasheet: Availability unknown Authors: Kyösti Mälkki , Mark D. Studebaker , Jean Delvare 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) device 1106:3337 (VT8237A) device 1106:3372 (VT8237S) device 1106:3287 (VT8251) device 1106:8324 (CX700) device 1106:8353 (VX800/VX820) device 1106:8409 (VX855/VX875) 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. The CX700/VX800/VX820 additionally appears to support SMBus PEC, although this driver doesn't implement it yet.