Re: How to access correctly serial port inside module?

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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 <[email protected]>
To: Jan Engelhardt <[email protected]>
Cc: Tilman Schmidt <[email protected]>, [email protected]
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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