Jean Delvare wrote: > 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. > Sounds good! Regards, Hans
