CVSROOT:	/cvs

Module name:	src

Changes by:	reyk@cvs.openbsd.org	2007/10/12 09:34:11
Modified files:

	sys/dev/ic     : ar5xxx.c ar5xxx.h 
Log message:

The newer single chip Atheros wireless chipsets like the AR5424,

AR2423 etc. are mostly compatible to the AR5212 but use a different

algorithm to set the 2GHz RF channel, that's why they didn't work in

OpenBSD.  I figured out that the channels were set with an offset,

setting channel 11 in the driver caused the hardware to set channel 5

etc.  Because I didn't figure out the pattern to fix the algoritm yet,

I fixed it in a workaroundish way by defining a small "table" with

offsets for the 11b channels to get the right results. For example, if

we want to set channel 11 (2462MHz), we add an offset of -30MHz, and

feed the result (2432MHz ^= channel 5) into the unmodified

AR5212/AR5112 RF setup function.
Long description for a commit message, but it needed some time to

figure it out. It is still not perfect, needs some more work, and it

doesn't work in all cases; but it allows to use newer chipsets in 11b

mode restricted to 1 or to 2Mbit/s.  11a mode seems to work without

problems so far.