how to trace echi controler by usb-skeleton.c

Dear All:
I want to trace ehci controller driver flow chart like Asynchronous
Schedule, period schedule etc.
Is it possible to do so by usb-skeleton.c?
I have successfully compiled usb-skeleton.c and insmod it in the module
list, but I have no idea how to activate it.
After studying the mailing list archive, I know it seems I have to add
proper USB_SKEL_VENDOR_ID and USB_SKEL_PRODUCT_ID.
But I didn't have any physical usb device.
Should I add some pseudo numbers to them?

And if it works after adding some pseudo numbers, how could I call those
file_operations? Should I make some char or block nodes or call some other
methods?

If it is not possible or too difficult to do so by usb-skeleton.c, could
some one tell me where can I get some examples for me?

Appreciate your help,
cckuo


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