Hi Greg, Shouldn't all bus drivers under linux-2.6.0/drivers/i2c/busses have at least one class defined? Most of them (19 out of 31) do not, which makes them useless if my undertanding is correct. Or at least sensor chips are not detected on them (I experienced this a few minutes ago and it took me a while to figure out why). If you tell me what the general policy about classes is, I volunteer to write and submit the (trivial) patch to fixe all the bus drivers. Thanks. -- Jean Delvare http://www.ensicaen.ismra.fr/~delvare/