Messages in this thread | | | Date | Mon, 28 May 2007 19:05:13 +0200 | From | Tilman Schmidt <> | Subject | Re: How to access correctly serial port inside module? |
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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@imap.cc Bonn, Germany Diese Nachricht besteht zu 100% aus wiederverwerteten Bits. Ungeöffnet mindestens haltbar bis: (siehe Rückseite)
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