vt6655 is a VIA driver for PCI devices, and vt6656 is for USB.

vt6656 is a mac80211 driver, since 3.17+.

vt6655 is included in the staging tree at linux-2.6/drivers/staging and it is NOT supported by linux-wireless developers or mailing list.

Instead ask for support in http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel or to the maintainers Greg Kroah-Hartman <greg@kroah.com> and Forest Bond <forest@alittletooquiet.net> .