lkml.org 
[lkml]   [2017]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Directly accessing serial ports from drivers w/o TTYs ?
From
Date
On 26.06.2017 14:51, Alan Cox wrote:

Hi,

> 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).

In my case, it's not really a serial link, but an backplane w/ FIFOs,
which looks like a serial ports to the host (AFAIK, historically coming
from older systems which actually had various serial controllers, eg.
rs232, rs485/mvb, etc). The backplane seems to simulate the lower
layers of an mvb network.

> 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.

I was thinking about something that looks like serdev from consumer
side, but instead directly works on struct uart_port, w/o actually
allocating a tty (and also the funny things like signals, etc).

> Why do you need to do otherwise ?

Maybe it could offer better performance ?


--mtx

\
 
 \ /
  Last update: 2017-06-29 13:46    [W:0.044 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site