> have both functions. The sort of devices we are talking typically > communicate over I2C or SPI buses though drivers for rs232 devices etc are > definitely on the cards. Basically we are interested in devices where direct > memory mapped access is not possible. We have I2C and SPI drivers so I assume you will use the lower layers of the stacks to do this ? > For discussion of why these don't fit within existing subsystems see > http://lkml.org/lkml/2008/5/20/135 and the rest of the associated thread. I don't see much there which says why you can't unify all this in a user space library. For RS232/423/.. devices you can go this path if you want (but I would keep it all in userspace anyway) as you can use a line discipline to sit on top of the port and provide another interface (eg the way PPP does)
