* serial or tty driver
@ 2007-02-17 15:55 Mockern
2007-02-17 19:29 ` H. Peter Anvin
0 siblings, 1 reply; 2+ messages in thread
From: Mockern @ 2007-02-17 15:55 UTC (permalink / raw)
To: linux-kernel
I have a question, what is really difference between serial and tty drivers?
As I understand tty is high level and communicates with user space.
Thank you
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: serial or tty driver
2007-02-17 15:55 serial or tty driver Mockern
@ 2007-02-17 19:29 ` H. Peter Anvin
0 siblings, 0 replies; 2+ messages in thread
From: H. Peter Anvin @ 2007-02-17 19:29 UTC (permalink / raw)
To: Mockern; +Cc: linux-kernel
Mockern wrote:
> I have a question, what is really difference between serial and tty drivers?
> As I understand tty is high level and communicates with user space.
That's pretty much it, yes. When you're talking to a serial port, you
have a stack that looks roughly like:
(Userspace)
VFS layer
tty layer ----------------------\
serial core layer line discipline
serial driver
(Hardware)
There are other devices which can exist below the tty layer, like the
pty driver:
(Userspace)
VFS layer
tty layer ----------------------\
pty driver line discipline
-hpa
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