> Am 18.08.2016 um 13:10 schrieb Pavel Machek <pa...@ucw.cz>: > > Hi! > >>> I am actually not convinced that GPS should be represented as >>> /dev/ttyS0 or similar TTY. It think they deserve their own driver >>> exposing them as simple character devices. That way we can have a >>> proper DEVTYPE and userspace can find them correctly. We can also >>> annotate them if needed for special settings. >> >> I would _love_ to see that happen, but what about the GPS line >> discipline that we have today? How would that match up with a char >> device driver? > > ./drivers/usb/serial/garmin_gps.c ? > > Hmm, some cleanups would be welcome there... plus it would be good to > know what is its interface to userland... it is not easily apparent > from the code. > > Actually, having some kind of common support for GPSes in the kernel > would be nice. (Chardev that spits NMEA data?
Yes and no. How do you apply tcsetattr to such a device? More or less by implementing another tty stack? > ) For example N900 GPS is > connected over network (phonet) interface, with userland driver > translating custom protocol into NMEA. Not very nice from "kernel > should provide hardware abstraction" point of view. Indeed. In such a case the translation should be done in the kernel. But it is not necessary for devices that already provide NEMA over UART. Still user-space should be able to tcsetattr how it wants to see the records (mainly CR/LF translations). BR, Nikolaus
