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i2c-stub: Support multiple chips

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Add support for multiple chips to i2c-stub. I've changed the memory
allocation scheme from static to dynamic, so that we don't waste too
much memory.

Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Mark M. Hoffman <[email protected]>
This commit is contained in:
Jean Delvare 2007-10-13 23:56:31 +02:00 • committed by Jean Delvare
commit 9d90c1fd9b
2 changed files with 65 additions and 32 deletions
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18
Documentation/i2c/i2c-stub
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@ -6,13 +6,14 @@ 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.
You need to provide chip addresses as a module parameter when loading this
driver, which will then only react to SMBus commands to these addresses.
No hardware is needed nor associated with this module. It will accept write
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.
quick commands to the specified addresses; it will respond to the other
commands (also to the specified addresses) by reading from or writing to
arrays 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
@ -26,8 +27,8 @@ The typical use-case is like this:
PARAMETERS:
int chip_addr:
The SMBus address to emulate a chip at.
int chip_addr[10]:
The SMBus addresses to emulate chips at.
CAVEATS:
@ -41,9 +42,6 @@ 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.