Re: How to access correctly serial port inside module?

["Lars K.W. Gohlke" <lkwg82@gmx.de>]

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Jan Engelhardt schrieb:
> 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@gmx.de>
> > To: Jan Engelhardt <jengelh@linux01.gwdg.de>
> > Cc: Tilman Schmidt <tilman@imap.cc>, linux-kernel@vger.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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> 	Jan

for example I want to print out it with printk().

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