I'm writing a library using the nl80211 family to, well, do basically what iw does (I want a reusable Golang-native implementation, which saves me from parsing iw's output). I have most of the bits that I need, but I'd like to fill out more of the library and make it useful to others. I'm a bit stuck on properly naming and describing the pieces of the HT capabilities represented by NL80211_BAND_ATTR_HT_CAPA. While being generally impressed with the amount of documentation in nl80211.h and other places, I've been unable to find any documentation on this particular field, other than what iw prints for each bit or bit combination. My first thought was that it was the set of per-band capabilities for the device (as defined by either the hardware or the driver, but either way below me enough that I don't think I care), and for the most part I still think that's right. But when it came to trying to represent the SMPS bits, it occurred to me that perhaps that wasn't right, since one of the supported values gets printed as "disabled", which seems more like a state than a capability. Also, "static" and "dynamic" are not representable separately, and set together, you get "disabled". But perhaps "disabled" is really "unsupported", and "static" and "dynamic" can't both be supported on the same band? Otherwise, how should I interpret this? I could simply leave it as a 0-3 value and let consumers handle the interpretation, but I'd like to be a bit friendlier than that, if I can. I've tried navigating the code from iw into nl80211.c, the mac80211 driver, and the various 802.11 headers, but between the transitions from one layer to the next and the distinctions between things named rdev and wiphy and sta, I'm a bit lost trying to determine what represents an underlying capability and what represents some sort of current state. I'm a complete newbie to this, both in code and concepts, but I hope I'm not so far in over my head that a little help won't be very useful. Thanks, Danek
