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From: Eli Cohen <echoline@gmail.com>
Date: Sat, 13 Jun 2020 07:18:12 -0700
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Subject: Re: [9front] new nusb/serial driver
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X-Bullshit: virtualized converged SVG shader hardware database 

hi cinap,

I need to work on this driver more still, and look at the openbsd
driver closer. I'm not even using the interrupt yet but it seems to
work with this device.

what I meant was, epintr is found on the first USB interface but epin
and epout are on the second USB interface, but I can't just set nifcs
= 2 because it's only one serial port. there is one serial port using
*two* USB interfaces, one for the (unused) interrupt endpoint, and the
next one for in/out

- echoline

On Sat, Jun 13, 2020 at 7:04 AM <cinap_lenrek@felloff.net> wrote:
>
> what makes you think that?
>
> the only driver using interrupt endpoints is the prolific driver, and it is
> used for getting serial line status for a port. if you have multiple ports,
> on different interfaces how are you going to know which port the status
> is for?
>
> prolific driver only supports one iface. the previous code would *NOT* do
> multiple calls to findendpoints() because nifc == 1. and it would sysfatal()
> if findendpoints() failed..
>
> so my assumption is that the interrupt endpoint is indeed per interface.
>
> does this make sense?
>
> --
> cinap