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

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Message-ID: <Pine.LNX.4.61.0705241246180.31549@yvahk01.tjqt.qr>
Date:	Thu, 24 May 2007 12:50:58 +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 12:45, Lars K.W. Gohlke wrote:

>Date: Thu, 24 May 2007 12:45:06 +0200
>From: Lars K.W. Gohlke <lkwg82@....de>
>To: Jan Engelhardt <jengelh@...ux01.gwdg.de>
>Cc: Tilman Schmidt <tilman@...p.cc>, linux-kernel@...r.kernel.org
>Subject: Re: How to access correctly serial port inside module?
>
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> Jan Engelhardt schrieb:
>> 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
>
> date is an example
>
> and you got it, I want to do "cat </dev/ttyS0" in-kernel.
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> =uj4G
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	Jan
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