On Tue, Oct 23, 2012 at 06:45:51PM +0000, Grant Edwards wrote: > FWIW, in some products we're planning that will require support for > various industrial serial protocols, I'm leaning towards abandoning > the tty driver approach and writing a stand-alone character device > driver. The byte-stream oriented tty/line-discipline layer just > doesn't fit well when dealing with frame-oriented industrial protocols > that depend on things like 9th bit addressing and detecting > sub-millisecond inter-byte timeouts. You might want to take a look at how the ppp line discipline (which is obviously highly packet oriented) works. One advantage of doing things that way is if you have a multiport serial card, where some ports want to play this packet-oriented approach, and other cards might be connected to a traditional modem or terminal sort of device, you won't have to figure out how to share a PCI board between two different drivers, allocating one port to the traditional tty/serial driver, and another one to your new driver, etc. Regards, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
