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Message-ID: <465B0BC9.2040502@imap.cc>
Date: Mon, 28 May 2007 19:05:13 +0200
From: Tilman Schmidt <tilman@...p.cc>
To: "Lars K.W. Gohlke" <lkwg82@....de>
CC: Jan Engelhardt <jengelh@...ux01.gwdg.de>,
linux-kernel@...r.kernel.org
Subject: Re: How to access correctly serial port inside module?
Am 24.05.2007 21:15 schrieb Lars K.W. Gohlke:
> Jan Engelhardt schrieb:
[code proposal]
>> [I've warned about it... ;-) ]
>
> is it the way to access from kernelspace the userspace fs?
> the not-correct-way?
Yes, indeed.
> If it is so, I will wait for another solution ;)
I'm not sure waiting will help. The roasted pigeons will not come
flying into your mouth.
The possible solutions have been sketched out for you:
a) open the device file from the kernel (described by Jan):
actively discouraged by the kernelnewbies.org FAQ document,
and probably won't even work IMHO
b) program the serial port directly (described by Jan):
will work only with one type of hardware and you'll have to
disable the regular serial driver first; frowned upon by kernel
gurus as "reinventing the wheel"
c) abuse the line discipline interface (described by me):
moderately well documented, and there's precedent for using it
that way in the well-accepted PPP module as well as my humble
contribution, the ser_gigaset driver; requires a userspace
daemon for pushing the line discipline module on the serial
port and keeping it there
d) use the serio interface (described by Ying Huang):
potentially cleaner conceptually and seems to work without a
userspace daemon, but apparently not documented anywhere
except in the source files drivers/input/serio/serport.c
and linux/drivers/input/mouse/sermouse.c
Now it's your turn to decide.
HTH
T.
--
Tilman Schmidt E-Mail: tilman@...p.cc
Bonn, Germany
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