On Thu, Aug 9, 2012 at 1:38 PM, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote: >> Maybe tty can do this, but want to have all modem related separately. >> There are many such hardware and many drivers coming up in near future. > > tty can't do all this. We have similar things with stuff like CAIF. Modem > has gone from pretending to be a serial port (tty) to appearing as a > smart multi-function controller. I second this, I plead guilty to suggesting to use "modem_shm" as a layer below because things like CAIF and Phonet are just growing and growing. Sure, many of them can emulate AT commands, but that is not their native tongue, and increasingly any AT command parser is constrained to userspace which in turn constructs the actually intended IPC command sequency for doing ATDT555784629568. These modems are not talking anything resembling a line discipline, they have their own binary protocol and above are protocols like CAIF and Phonet talking to the modem, including IPC to processes running on the other sides, with states. Sjur is currently working on a future platform where we'll attempt to bring things closer to existing Linux frameworks using virtio rings and rpmesg also on the modem side, but the modems Arun are working on are already deployed with this type of firmware talking some other IPC lingo. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
