NAME

       i2c-stub-from-dump - feed i2c-stub with dump files

SYNOPSIS

       i2c-stub-from-dump address[,address,...]  dump-file [dump-file ...]

DESCRIPTION

       i2c-stub-from-dump  is  a  small  helper script for the i2c-stub kernel driver.  It lets you setup one or
       more fake I2C chips on the i2c-stub bus based on dumps of the chips you want to emulate.

       i2c-stub-from-dump requires i2cdetect and i2cset to be installed and reachable through the  user's  PATH.
       The former is used to find out the i2c-stub bus number, while the latter is used to write to the fake I2C
       chips.

EXAMPLE

       You  have  an I2C chip on system A. You would like to do some development on its driver on system B. Here
       are the few steps you have to follow.

       On system A, use i2cdump to capture a dump from the chip. Assuming that the chip  in  question  lives  at
       address 0x4c on I2C bus 0, you would run:

               i2cdump -y 0 0x4c b > chip.dump

       Adjust  the  bus  number and chip address for your case. i2cdetect can help you find out their values. If
       the device uses word (16-bit) register access instead of the traditional byte (8-bit) access, use mode  w
       instead of b.

       Copy the dump file to system B.

       On system B, run:

               i2c-stub-from-dump 0x4c chip.dump

       This  will  load  the required i2c-dev and i2c-stub kernel drivers if needed, then write all the register
       values to the emulated I2C chip at address 0x4c.  Again, adjust the address as needed.

LIMITATIONS

       There are some limitations to the kind of devices that can be handled:

       •      Device must not have banks (as most Winbond devices do).

BUGS

       To report bugs or send fixes, please write to the Linux I2C mailing list <linux-i2c@vger.kernel.org> with
       Cc to the current maintainer: Jean Delvare <jdelvare@suse.de>.

SEE ALSO

       i2cdump(8), i2cdetect(8), i2cset(8)

AUTHOR

       Jean Delvare

                                                   March 2010                              I2C-STUB-FROM-DUMP(8)