On 2015-05-27 22:48, Stefan Rompf wrote: > Hi Kirill, > >> So I made a patch for atheros driver and it works. A signal level on >> different frequencies is more or less equal and seems adequate (about >> -30 dbm if a client within a meter from ap). > > so you reverse engineered the timer values, the response format and the 's' > command I had planned looking at next weekend. Very cool work! > > Now that talking to the HSR seems mostly solved, this makes me think about > OpenWrt integration. Currently I see two possibities: > > Integration into the kernel driver like your latest patch does. > > Caveat: The build process seems to assume that all routers in the > ar71xx/generic target share the same set of kernel modules. So patching and > compiling yourself is no problem, but a working image on > downloads.openwrt.org > is not feasible as every router would get the HSR driver. Correct me if I am > wrong. > > Or making ath9k expose the gpio and driving from user space. A generic patch > for ath9k to register its gpio pins via the standard gpio subsystem. This > should go upstream to the kernel and may prove usable for other access points > to. > > An Unifi specific user space daemon listens to scan and channel change events > via netlink (will check next weekend if channel change is broadcasted > reliably) and tune the filter via sysfs interface accordingly like hsr.c > tried. > > Caveat: Changing ath9k driver is possibly stuff for Designated Driver. May be > the user space component can fall back to bit banging for Chaos Calmer. > > What do you think? What do OpenWrt core developers think? I'd prefer exposing > gpio and driving from userspace. I think deferring this to user space might mess up timings during fast active scans. I'd prefer to have a callback in ath9k_platform.h that allows the platform code to provide a hook which implements this. That way the changes to ath9k stay very small, and the code is still quite simple.
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