On Wed, 2013-03-27 at 13:06 -0700, Greg KH wrote:
> > Our current prototypes borrow the Sierra VID
> And the USB-IF might revoke your vendor id, if they find you shipping a
> device with a different vendor id than the one you have been assigned.

One of the reasons we borrowed that VID is that we do not currently have
a VID assigned. We are still deciding whether it is worth joining the
USB-IF just to get a vendor ID for a few thousands of devices.

I am of the opinion that it is, but I cannot sign the membership forms
on behalf of GSI. We probably will end up buying a VID soon.

> Why not just add your device id to an existing driver, sending in a
> patch to do so.  All distros will pick that up and then your device will
> "just work" on all Linux distros.

I was under the impression that drivers in the linux mainline had to be
for hardware that was widely available. I take it then, that just adding
support to an existing driver is acceptable?

That wouldn't address people with older linux distributions, but would
definitely be a good long term solution. It's really a shame there is no
USB-IF standard for usb-serial... then things would even potentially
work out of the box on windows.

> > What driver should I target?
> What chip do you use for your device?

The device I am concerned about right now has an Altera arria2 connected
to a cy7c68013a-56baxc (fx2lp). We have several form factor variations.
A few have FTDI chips where I don't need to care, but can also do less.

> If you just want "raw" data, then do something like the
> drivers/usb/serial/zio.c driver, tiny, simple, and trivial.

Yes, if I make source-level changes to the kernel I have many options.

PS. Thank you for the very prompt reply!


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