Message-ID: <465D22A6.4090107@gmx.de>
Date: Wed, 30 May 2007 09:07:18 +0200
From: "Lars K.W. Gohlke" <lkwg82@gmx.de>
User-Agent: Thunderbird 2.0.0.0 (Windows/20070326)
MIME-Version: 1.0
To: Tilman Schmidt <tilman@imap.cc>
CC: Jan Engelhardt <jengelh@linux01.gwdg.de>, linux-kernel@vger.kernel.org
Subject: Re: How to access correctly serial port inside module?
References: <46485D84.1010902@gmx.de> <46489EF1.2020509@gmx.de> <Pine.LNX.4.61.0705142158340.9570@yvahk01.tjqt.qr> <4648E9F7.5090908@imap.cc> <Pine.LNX.4.61.0705151020310.9570@yvahk01.tjqt.qr> <46536C0F.50101@imap.cc> <4655676A.1000102@gmx.de> <4655C554.7030000@imap.cc> <4655C93D.40005@gmx.de> <Pine.LNX.4.61.0705241927410.31549@yvahk01.tjqt.qr> <4655E463.7000201@gmx.de> <465B0BC9.2040502@imap.cc>
In-Reply-To: <465B0BC9.2040502@imap.cc>
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Tilman Schmidt schrieb:
> 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.
>

When I'm chosing option d) can smb. help me step by step? There are so
many pieces of code I don't understand.

Ok, let's begin:

my kernel source base is : ubuntu-lts 6.06 and 2.6.15-7
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.15.y.git;a=tree;f=drivers/input/serio;

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