On Tue, 2008-12-02 at 23:12 -0800, Greg KH wrote:

> Ick.  Ok, care to come up with some kind of hook into the gpio subsystem
> of the kernel so we don't create a new user/kernel interface for
> something that we already support?

Yeah, it does seem like exposing GPIOs to user space would be really
useful. Coming up with credible semantics seems a bit tricky though, and
may not fit the read/write model that we know and love.

> libusb can be very fast.  The new version handles multiple urbs in
> flight, and threaded applications very easily.  You might want to take a
> look at it again if it has been a while.

Sigh. Yes, I can probably use libusb for this application. Not as easily
as I can hack up the kernel, but it should do the trick.

-- 
keith.packard@intel.com