[PATCH 0/6] rtl8187: Adding Realtek rtl8187B support

[Hin-Tak Leung <hintak_leung@yahoo.co.uk>]

There was a problem with the integrated patch posted by Pavel on May 22 -
for those who did not get good result, please retry; We identified some code
for detecting early 8187B's with an 8187 id which seems to have a weaker
chip and Larry is working on a 7th patch for it - people having 8187B's with an
0x8187 id should get in touch.

Each of the 6 passes checkpatch.pl, and compiles cleanly with wireless-testing 
head one after the other. The first two modifies the header files, the 3rd adds
radio routines. 4th and 5th modifies the main driver code and the division
is somewhat arbitrary; the 6th updates Kconfig.

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rtl8187: Adding Realtek rtl8187B support

Herton wrote most of this based on the Realtek vendor driver, with
contributions from John W. Linville and feedbacks from Pavel. Hin-Tak
fixed tranmission of management frames and got it to work. Pavel removed
procfs support and tidied up the patch. Larry split the patch into 6 parts.

HTL, 2008-07-01:
There is occasional problem with unloading - modprobe -r and ksoftirqd
takes up all CPU time (on x86_64, dual core).

HRK, 2008-04-09:
Rate control doesn't work for 8187b, for 8187 it never worked either.
If you set rate manually to something lower (I found that for 2-3 meters
from AP 11M seems to be the best setting) it works much better (there aren't
stalls/packet drops).

PR, 2008-05-22:
The driver loads and initializes the device successfully.  Bringing the
interface up is very slow (10 to 20 seconds), but it works.  Scanning
works, ... [Edited] Association to APs without encryption works ...
[Edited] Unloading the module is working.

Matthew Garrett wrote on 2008-06-23:
Some vendors are shipping 8187bs with the 0x8187 product id, so the driver
really needs to probe rather than having a static setup of which is which.

Hauke Mehrtens wrote on 2008-01-12 regarding 8187 rate control:
If the rate goes over 11M no TCP/IP traffic goes through the wireless
connecting. If rate is set to auto and the rate control algorithm changes
it to something less than 11M TCP/IP traffic goes through, but if it is more
than 11M no TCP/IP traffic goes through the wireless link. With
"iwconfig wlan0 rate 11M" everything works.

Michael Wu wrote on 6 Nov 2007 on 8187 rate control:
.... you can find the specs for the 8186 floating around on the net
which tells you a bit about the registers. Doesn't tell you anything about
the rx/tx path of the usb variant, which is a bit inferior to the rx/tx path
of the pci chips. There's no easy way to do tx ack reporting on the rtl8187.
The only solutions that could work involve some polling or a different rate
control algorithm.