USB: serial: pl2303: add Delock Infrared device id

[Johan Hovold <johan@kernel.org>]

On Sun, Feb 10, 2019 at 01:49:16AM +0330, Ebrahim Byagowi wrote:
> 
> On 2/9/19 7:11 PM, Johan Hovold wrote:
> > On Sat, Feb 09, 2019 at 02:14:21PM +0330, Ebrahim Byagowi wrote:
> >> On 2/9/19 1:16 PM, Johan Hovold wrote:
> >>> On Sat, Feb 09, 2019 at 12:18:40PM +0330, ebrahim@gnu.org wrote:
> >>>> From: Ebrahim Byagowi <ebrahim@gnu.org>
> >>>>
> >>>> This makes Delock Infrared adapter to work as a USB to Serial device.
> >>>> ---
> >>>>  drivers/usb/serial/pl2303.c | 1 +
> >>>>  drivers/usb/serial/pl2303.h | 3 +++
> >>>>  2 files changed, 4 insertions(+)

> > These descriptors do no look like they come from a pl2303 device (e.g.
> > the device descriptor class and protocol is 255/1/0 and not 0/0/0).
> >
> >> I've uploaded a screenshot here
> >> https://commons.wikimedia.org/wiki/File:A_modified_kernel_screenshot_on_QEMU.png
> >> which shows it understands a remote control commands also.
> > It shows that you receive something over the bulk-in endpoint at the
> > default line speed, but those -EPIPE errors also tells us that this is
> > not a pl2303 device.
> Oh, understandable. And very sorry that I was misleading here.

No, problem.

> > Would you be able to open the device to see if you can identify a
> > generic usb-serial chip inside?
> 
> Here is a picture of its inside[1] and that 3606 apparently is the usb
> to serial chip.
> 
> We suspected it is related to[2] but its pins doesn't match and I
> couldn't yet test the module provided there is related for some reason
> so any pointer will be nice.

No, sorry. It's seems unlikely to be a mcs7780 given the pins.

Perhaps looking closer at the windows driver and snooping traffic might
provide some insights into the protocol used.

A search also revealed one libusb project for this device on
sourcefourge, but judging from a very quick look it also just did reads
and writes over the bulk-endpoints without any control commands. But
perhaps someone has done some research in this area before you.

Johan

>   [1]:
> https://commons.wikimedia.org/wiki/File:Infrared_Device,_VID1685_PID0200.jpg
> 
>   [2]:
> https://www.asix.com.tw/products.php?op=pItemdetail&PItemID=112;74;109&PLine=74