timeout()/untimeout() API:
- Clients supply callout handle storage, thus eliminating problems of
resource allocation.
- Insertion and removal of callouts is constant time, important as
this facility is used quite a lot in the kernel.
The old timeout()/untimeout() API has been removed from the kernel.
Reorganise the driver some what.
Rename tr_reset() to the more appropriate tr_stop().
Create a common tropic reset routine and use it in the frontends.
Move the code in tr_config() which is only used in the card attachment
routines into a new tr_attach() function.
Take adapter off the ring through tr_shutdown() in a shutdown hook.
This simplifies the bus-specific frontend.
