How to use phone as an USB Wi-Fi adapter?

I would like to use my SE Xperia 8 with 2.1 as an usb wifi adapter to my PC. What I would like to do is set it to access point mode and share my ADSL internet with my laptop through wifi. I would connect the phone via an usb cable and I would like to be able to route and share my pc's internet through it to and back from my laptop. I don't mind if the firmware must be changed as I have an other phone. But I prefer if there is easier/more convenient way to do this. On the pcs I'm also flexible about OSes. How could I use my phone as an wifi adapter? **EDIT** To make it more clear, here is what I mean: I have: * "PC A" with internet over ADSL. no wifi. * my phone, it has an usb cable and a wifi chipset. * "PC B" with wifi What I would like to do us **to use PC A's internet on PC B, with the help of my phone**. Connect Internet to PC A, then connect my phone to PC A, then connect PC B to my phone via Wifi, and use PC A's internet on PC B. Internet >>> Adsl modem >>> ethernet cable >>> PC A >>> USB cable >>> phone >>> wifi >>> PC B