Re: How to access correctly serial port inside module?

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

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Lars K.W. Gohlke schrieb:
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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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[linux/drivers/input/mouse/sermouse.c]

Where can I see, which serial line is used to get data stream from?

The mouse is plugged in. Where is the decision made, that maybe port0 is
 used?
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