How can you identify the chipset of a USB device in Linux?

I'd like to be able to identify the chipset a particular USB device is using. I know about lsusb (and now /proc/bus/usb/devices), but they don't provide as much information as lspci.

Here is an example of how I use lsusb:

(laptop:/proc/bus/usb) # lsusb -v -d 050d:805c
Bus 001 Device 008: ID 050d:805c Belkin Components
Device Descriptor:
:
idVendor           0x050d Belkin Components
idProduct          0x805c
bcdDevice            0.01
iManufacturer           1 Ralink
iProduct                2 802.11 n WLAN
:

... and /proc/bus/usb/devices (thanks to a comment on this thread):

T:  Bus=01 Lev=02 Prnt=03 Port=02 Cnt=01 Dev#=  8 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=050d ProdID=805c Rev= 0.01
S:  Manufacturer=Ralink
S:  Product=802.11 n WLAN
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=  4mA

Although I can see that I'm looking at the right USB device (Belkin USB 801.11n with Ralink chipset), I still can't determine the exact chipset version. The "0x805c" doesn't match a chipset number I'd expect (2500 - 2900).

I'm thinking that perhaps it isn't even possible to query this information across the USB bus.

Thanks in advance for any help.