https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: a0d271cbfed1dd50278c6b06bead3d00ba0a88f9 authored by Linus Torvalds on 30 September 2012, 23:47:46 UTC
Linux 3.6
Linux 3.6
Tip revision: a0d271c
i2c-stub
MODULE: i2c-stub
DESCRIPTION:
This module is a very simple fake I2C/SMBus driver. It implements five
types of SMBus commands: write quick, (r/w) byte, (r/w) byte data, (r/w)
word data, and (r/w) I2C block data.
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 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
EEPROMs, among others.
The typical use-case is like this:
1. load this module
2. use i2cset (from the i2c-tools project) to pre-load some data
3. load the target chip driver module
4. observe its behavior in the kernel log
There's a script named i2c-stub-from-dump in the i2c-tools package which
can load register values automatically from a chip dump.
PARAMETERS:
int chip_addr[10]:
The SMBus addresses to emulate chips at.
unsigned long functionality:
Functionality override, to disable some commands. See I2C_FUNC_*
constants in <linux/i2c.h> for the suitable values. For example,
value 0x1f0000 would only enable the quick, byte and byte data
commands.
CAVEATS:
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.