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)