diff options
Diffstat (limited to 'Documentation/i2c')
| -rw-r--r-- | Documentation/i2c/busses/i2c-viapro | 7 | ||||
| -rw-r--r-- | Documentation/i2c/i2c-stub | 15 |
2 files changed, 19 insertions, 3 deletions
diff --git a/Documentation/i2c/busses/i2c-viapro b/Documentation/i2c/busses/i2c-viapro index 16775663b9f..25680346e0a 100644 --- a/Documentation/i2c/busses/i2c-viapro +++ b/Documentation/i2c/busses/i2c-viapro @@ -7,9 +7,12 @@ Supported adapters: * VIA Technologies, Inc. VT82C686A/B Datasheet: Sometimes available at the VIA website - * VIA Technologies, Inc. VT8231, VT8233, VT8233A, VT8235, VT8237R + * VIA Technologies, Inc. VT8231, VT8233, VT8233A Datasheet: available on request from VIA + * VIA Technologies, Inc. VT8235, VT8237R, VT8237A, VT8251 + Datasheet: available on request and under NDA from VIA + Authors: Kyösti Mälkki <kmalkki@cc.hut.fi>, Mark D. Studebaker <mdsxyz123@yahoo.com>, @@ -39,6 +42,8 @@ Your lspci -n listing must show one of these : device 1106:8235 (VT8231 function 4) device 1106:3177 (VT8235) device 1106:3227 (VT8237R) + device 1106:3337 (VT8237A) + device 1106:3287 (VT8251) If none of these show up, you should look in the BIOS for settings like enable ACPI / SMBus or even USB. diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub index d6dcb138abf..9cc081e6976 100644 --- a/Documentation/i2c/i2c-stub +++ b/Documentation/i2c/i2c-stub @@ -6,9 +6,12 @@ This module is a very simple fake I2C/SMBus driver. It implements four types of SMBus commands: write quick, (r/w) byte, (r/w) byte data, and (r/w) word data. +You need to provide a chip address as a module parameter when loading +this driver, which will then only react to SMBus commands to this address. + No hardware is needed nor associated with this module. It will accept write -quick commands to all addresses; it will respond to the other commands (also -to all addresses) by reading from or writing to an array in memory. It will +quick commands to one address; it will respond to the other commands (also +to one address) by reading from or writing to an array in memory. It will also spam the kernel logs for every command it handles. A pointer register with auto-increment is implemented for all byte @@ -21,6 +24,11 @@ The typical use-case is like this: 3. load the target sensors chip driver module 4. observe its behavior in the kernel log +PARAMETERS: + +int chip_addr: + The SMBus address to emulate a chip at. + CAVEATS: There are independent arrays for byte/data and word/data commands. Depending @@ -33,6 +41,9 @@ If the hardware for your driver has banked registers (e.g. Winbond sensors chips) this module will not work well - although it could be extended to support that pretty easily. +Only one chip address is supported - although this module could be +extended to support more. + If you spam it hard enough, printk can be lossy. This module really wants something like relayfs. |