On Sun, 28 Oct 2007 21:09:37 +0100, Jean Delvare wrote: > On Sun, 28 Oct 2007 15:24:06 +0100, Hans de Goede wrote: > > Jean Delvare wrote: > > > Also, I suggest that you add detection for the TMP401 to sensors-detect > > > right away. That's the best way to find early testers for your work. > > > > Done. (not tested I don't have access to the actual hardware at this moment). > > In this kind of situation, I can only recommend using Mark Hoffman's > i2c-stub driver. It allows emulating one or more I2C/SMBus chips from > dumps. It works as follows: > > * On the machine with the chip, use i2cdump to dump the registers of > the chip: > > i2cdump -y 0 0x4c b > tmp401.dump > > * On your own workstation, build the i2c-stub driver > (CONFIG_I2C_STUB=m) and load it. You must pass the chip address as a > parameter, so that the driver will emulate a chip at this specific > address: > > modprobe i2c-stub chip_addr=0x4c > > * Program the emulated chip from the dump. Get my helper script from: > > http://jdelvare.pck.nerim.net/sensors/stub-from-dump.pl > > Run that script on the dump and it will generate a shell script to > program the emulated chip: > > ./stub-from-dump.pl tmp401.dump > set_tmp401.sh > > Then as root, run the script in question: > > sh set_tmp401.sh 6 0x4c > > Adjust the bus number so that it matches those of i2c-stub, check with > i2cdetect -l. The script simply runs i2cset for each register. > > At this point you have an emulated chip to play with. It will let you > test sensors-detect, device detection at driver load, the sysfs > interface, etc. > > Limitations: > * Driver must only use byte register access. i2c-stub supports word > access by my script doesn't (yet). > * Device must not have banks (as Winbond devices do). > * You can't test alarms this way, obviously. > > Beware that i2c-stub is very verbose and will flood your logs. This > might help a lot when debugging the driver though. > > If this proves useful, I should probably cleanup stub-from-dump.pl and > include it in i2c-tools so that others can benefit. I've committed an improved version of this script to the i2c-tools repository. This version programs the i2c-stub chip directly rather than generating an intermediate shell script. It also loads the i2c-stub driver automatically, and detects its number automatically as well. I've also added a manual page so that hopefully more developers can use it. -- Jean Delvare
