linux-kernel - Re: serial or tty driver

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Message-ID: <45D757AD.30208@zytor.com>
Date:	Sat, 17 Feb 2007 11:29:49 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mockern@...dex.ru
CC:	linux-kernel@...r.kernel.org
Subject: Re: serial or tty driver

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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