sting ~ # lspci|grep ther
00:19.0 Ethernet controller: Intel Corporation Unknown device 1049 (rev 03)
03:00.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC (rev 01)

when I did modprobe ath_pci, I see this in /var/log/messages...
Jul 18 15:41:54 sting kernel: ath_hal: 0.9.18.0 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
Jul 18 15:41:54 sting kernel: wlan: 0.8.4.2 (0.9.3.1)
Jul 18 15:41:54 sting kernel: ath_pci: 0.9.4.5 (0.9.3.1)

...but I still don't have an ath0 according to wpa_supplicant...

sting ~ # wpa_supplicant -i ath0 -Dmadwifi -c /etc/wpa_supplicant/wpa_supplicant.conf 
ioctl[SIOCSIWPMKSA]: No such device
ioctl[SIOCSIWMODE]: No such device
Could not configure driver to use managed mode
ioctl[SIOCGIFFLAGS]: No such device
Could not set interface 'ath0' UP
ioctl[SIOCGIWRANGE]: No such device
ioctl[IEEE80211_IOCTL_SETPARAM]: No such device
ioctl[SIOCSIWAP]: No such device
ioctl[SIOCGIFFLAGS]: No such device
Failed to initialize driver interface
Segmentation fault

and wireless-tools doesn't think I have anything either.

sting ~ # iwconfig
eth0      no wireless extensions.

lo        no wireless extensions.

sit0      no wireless extensions.