On Tue, Nov 23, 2021 at 09:34:30AM +0100, Anton Lundin wrote:

On 23 November, 2021 - Johan Hovold wrote:

quoted

On Tue, Nov 23, 2021 at 08:16:13AM +0100, Anton Lundin wrote:

quoted

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

quoted

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.

Ok, thanks for checking. Judging from the Prolific site the only G type
device that comes in a QFP type package appears to be PL2303GC.

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

Thanks. Currently bcdDevice is the only known way to do this, but I may
get back to you on this later.

Let's assume it's a PL2303GC for now.

Johan