USB ppbus?

[George Mitchell]

On 12/20/16 12:57, Hans Petter Selasky wrote:
> On 12/19/16 20:19, George Mitchell wrote:
>> I have a USB cable that terminates in a DB25 connector.  Inside is a
>> Prolific Technology PL2305:
>> http://prolificusa.com/files/ds_pl2305I_v1.0.pdf
>> It probes as a ulpt.  I would love if there existed such a thing as
>> a uppi device.  Does it sound possible to get to such a result by
>> extending the ppbus code to know about USB?  Or might it be simpler
>> to try to add the ppi ioctls (PPIGDATA, etc.) to ulpt.c?   -- George
> 
> Hi George,
> 
> There is currently no such thing. ulpt only provides a raw character
> device. The ppbus could possibly be implemented in userspace using libcuse.
> 
> --HPS
>
> [...]

Thanks for the response.  I think I could kludge the ioctls I want into
ulpt.c by learning more about the USB system works.  Possibly.  On a
good day.                                                    -- George