more i2c bus drivers

Hi Greg,

I will be sending 2 more patches to you, based on linux-2.6.0-test11. They still concern bus drivers. These fixes and improvements were already made to our CVS repository, and should go to Linux 2.6 too.

Details about what the patch do, credits and more will be found with each patch.

Thanks.

Jean Delvare
http://www.ensicaen.ismra.fr/~delvare/