DESCRIPTION:
-This module is a very simple fake I2C/SMBus driver. It implements three
-types of SMBus commands: write quick, (r/w) byte data, and (r/w) word data.
+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
+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
+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
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.
git://git.onelab.eu / linux-2.6.git / blobdiff