This adapter cannot be driven by free software only. You can replace it with
hardware from ThinkPenguin or from Tehnoetic (the only two vendors I know
that guarantee that Linux-libre can drive their hardware):
http://libre.thinkpenguin.com
http://tehnoetic.com
You can also trust somebody who reports that she recently bought a Wifi
adapter that works with Linux-libre. I bought several of this adpater in
December and Linux-libre could drive them:
http://www.tp-link.com/en/products/details/?categoryid=243&model=TL-WN722N
It is possible (maybe not probable) that the chipset on that adapter has been
changed since then. The chipset is what matters... and it is never indicated
on the package (so that the manufacturer can change it).
