rtl819x
r8192_pci is a Realtek driver for PCI-E devices and r8192s_usb/r8192u_usb are for USB.
They are included in the staging tree at linux-2.6/drivers/staging and they are NOT supported by linux-wireless developers or mailing list.
Instead ask for support in http://driverdev.linuxdriverproject.org/mailman/listinfo/devel or to the maintainer, Greg Kroah-Hartman < greg@kroah.com >.
UPDATE: 22.10.2010
The r8192s_usb driver has been dropped in favor of rtl8712 in linux-next, as this commit suggests.