lkml.org 
[lkml]   [2007]   [May]   [30]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateWed, 30 May 2007 09:46:52 +0200
From"Lars K.W. Gohlke" <>
SubjectRe: How to access correctly serial port inside module?
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Lars K.W. Gohlke schrieb:
> -----BEGIN PGP SIGNED MESSAGE-----> Hash: SHA1>> 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;>>> -----BEGIN PGP SIGNATURE-----> Version: GnuPG v1.4.3 (MingW32) - GPGrelay v0.959>> iD8DBQFGXSKoAAomYJ1taN8RApggAJ99t+yMvPScr4yhOoTOS9TvYVUMsgCeJAbI
> nGTvFGb49gUOzJG17Nmypq4=> =K4W8> -----END PGP SIGNATURE-----


[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?
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.3 (MingW32) - GPGrelay v0.959
iD8DBQFGXSvtAAomYJ1taN8RAjYtAKDfYqyK//u96/sxWMdLuUfRtMi2XwCg031C
lfEog7wFwd280dJeoqEZvu4=
=AH3F
-----END PGP SIGNATURE-----begin:vcard
fn:Lars K.W. Gohlke
n:Gohlke;Lars K.W.
email;internet:lkwg82@gmx.de
x-mozilla-html:FALSE
version:2.1
end:vcard

\
 
 \ /
  Last update: 2007-05-30 07:49    [from the cache]
©2003-2008