Is pl2303 driver there?

[H S Rai <hsrai@gndec.ac.in>]

I read on Internet that new Kernel has pl2303 driver ( USB 
to Serial Driver ). I am using Debian with Kernel 3.1

I want to check wether this driver is there or not. What is 
the way to check it?

If, it is not there, from where I could find (suitable for 
debian setup) it, and how one will install it?

Any information about it and pointer to useful link ( or 
detailed help, if possible ) will be highly appreciated.

Thanks in advance.

--
H.S.Rai