linux-kernel - Re: How to access correctly serial port inside module?

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Message-ID: <Pine.LNX.4.61.0705241224510.31549@yvahk01.tjqt.qr>
Date:	Thu, 24 May 2007 12:26:44 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	"Lars K.W. Gohlke" <lkwg82@....de>
cc:	Tilman Schmidt <tilman@...p.cc>, linux-kernel@...r.kernel.org
Subject: Re: How to access correctly serial port inside module?

On May 24 2007 12:22, Lars K.W. Gohlke wrote:
>
> ok, I have read everything and also have read the chapters about
> tty_drivers. However I'm not really understand, how to ... .
>
> I will summarize the concrete scenario, which will lead to the
> understanding and further solution of deadling with serial driver.
>
> [scenario]
>
> 1. in userspace I'm doing: > date > /dev/ttyS0
> 2. in kernelspace I want to print out this date.
>
> [/scenario]
>
> I'm really new to kernel coding, that's why I maybe understand some
> functions not the proper way.
>
> I'm a bit confused.

So am I. Usually, you connect two different machines with a serial cable.
(Leaving out the special case of connecting ttyS0-ttyS1 on the same machine.)

This poses the first question: whose kernelspace? the sender or
the receiver side? And by "this date" do you perhaps mean
"whatever was sent", or specifically a date? And print to _where_?

Up to now, it looks like you want to do "cat </dev/ttyS0" in-kernel.

	Jan
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