swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
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Tip revision: 8bbde0e6d52265158ee9625f383500c1a7d09ba9 authored by Linus Torvalds on 19 April 2006, 03:00:49 UTC
Linux v2.6.17-rc2
Linux v2.6.17-rc2
Tip revision: 8bbde0e
i2c-stub
MODULE: i2c-stub
DESCRIPTION:
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.
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
also spam the kernel logs for every command it handles.
A pointer register with auto-increment is implemented for all byte
operations. This allows for continuous byte reads like those supported by
EEPROMs, among others.
The typical use-case is like this:
1. load this module
2. use i2cset (from lm_sensors project) to pre-load some data
3. load the target sensors chip driver module
4. observe its behavior in the kernel log
CAVEATS:
There are independent arrays for byte/data and word/data commands. Depending
on if/how a target driver mixes them, you'll need to be careful.
If your target driver polls some byte or word waiting for it to change, the
stub could lock it up. Use i2cset to unlock it.
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.
If you spam it hard enough, printk can be lossy. This module really wants
something like relayfs.