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Date:   Tue, 23 Nov 2021 09:34:30 +0100
From:   Anton Lundin <glance@acc.umu.se>
To:     Johan Hovold <johan@kernel.org>
Cc:     linux-usb@vger.kernel.org
Subject: Re: pl2303 converter detected, unknown device type
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References: <20211123071613.GZ108031@montezuma.acc.umu.se>
 <YZyijnKD7dixoaV+@hovoldconsulting.com>
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On 23 November, 2021 - Johan Hovold wrote:

> On Tue, Nov 23, 2021 at 08:16:13AM +0100, Anton Lundin wrote:
> > I just picked up a new usb-rs232 adapter and was met by the following on
> > a modern kernel:
> > 
> > # uname -r
> > 5.16.0-rc2
> > 
> > usb 3-7: new full-speed USB device number 5 using xhci_hcd
> > usb 3-7: New USB device found, idVendor=067b, idProduct=23a3, bcdDevice= 1.05
> > usb 3-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> > usb 3-7: Product: ATEN USB to Serial Bridge
> > usb 3-7: Manufacturer: Prolific Technology Inc.
> > pl2303 3-7:1.0: pl2303 converter detected
> > pl2303 3-7:1.0: unknown device type, please report to linux-usb@vger.kernel.org
> 
> > I'm guessing it just needs a case for this bcdDevice.
> 
> Indeed, and thanks for reporting this. I'll add the missing entry.
> 
> Do you know what kind of PL2303 this is (e.g. PL2303GC)?

Sorry nope. The device is potted with some kind of opaque plastic, so I
can see that there are two qfp's on the board, but not the numbers on
them.

If there is some way of identifying the chip I can build a custom driver
that can read out any information if that helps.


//Anton