On Mon, 26 Jun 2017 00:43:12 +0200 "Enrico Weigelt, metux IT consult" <[email protected]> wrote:
> Hi folks, > > > is there already a way for accessing serial ports from drivers, > w/o having to go through the TTY subsystem ? > > Serdev seems provide a connection between arbitrary TTYs to device > drivers. But this implies always having a TTY for each UART (even if > it's never used outside the kernel). > > Is there any way for accessing uarts more directly ? You can write your own driver for the physical hardware and claim it in your driver. Shouldn't normally be needed except for bizarre cases when a serial link is used for something very non tty like (eg as GPIO lines). Otherwise all the low level tty device locking, queues and interfaces assume there is a tty_struct attached to it, so yes you need a tty struct. Why do you need to do otherwise ? Alan
