Prolific Technology pl2303: unknown device type

Prolific Technology pl2303: unknown device type

[Giles Roadnight]

Hi

I am trying to connect a Prolific pl2303 to my raspberry pi 4 running
raspberry pi os 64 bit. When I look at dmesg I get the following
output:

[ 31.714397] cam-dummy-reg: disabling
[ 44.046197] usb 1-1.1: USB disconnect, device number 3
[ 47.254348] usb 1-1.1: new full-speed USB device number 4 using xhci_hcd
[ 47.361386] usb 1-1.1: New USB device found, idVendor=067b,
idProduct=23a3, bcdDevice= 6.05
[ 47.361402] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 47.361407] usb 1-1.1: Product: USB-Serial Controller
[ 47.361412] usb 1-1.1: Manufacturer: Prolific Technology Inc.
[ 47.361417] usb 1-1.1: SerialNumber: ALBAb115819
[ 47.364081] pl2303 1-1.1:1.0: pl2303 converter detected
[ 47.364106] pl2303 1-1.1:1.0: unknown device type, please report to
linux-usb@vger.kernel.org

so I followed the example and emailed this address!

and with lsusb:

lsusb -v
Bus 001 Device 004: ID 067b:23a3 Prolific Technology, Inc. USB-Serial Controller
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x067b Prolific Technology, Inc.
  idProduct          0x23a3
  bcdDevice            6.05
  iManufacturer           1 Prolific Technology Inc.
  iProduct                2 USB-Serial Controller
  iSerial                 3 ALBAb115819
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0027
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x000a  1x 10 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0

Any help much appreciated. Thanks

Giles Roadnight
http://giles.roadnight.name

Re: Prolific Technology pl2303: unknown device type

[Giles Roadnight]

I have managed to get this working on an older version of the kernel.
I have tried raspberry pi os buster (debian version 10) and the serial
port was correctly created.
It was Raspberry pi os bullseye (debian 11) that this did not work for.

Giles Roadnight
http://giles.roadnight.name


Giles Roadnight
http://giles.roadnight.name


On Sat, 18 Jun 2022 at 07:42, Giles Roadnight <giles.roadnight@gmail.com> wrote:
>
> Hi
>
> I am trying to connect a Prolific pl2303 to my raspberry pi 4 running
> raspberry pi os 64 bit. When I look at dmesg I get the following
> output:
>
> [ 31.714397] cam-dummy-reg: disabling
> [ 44.046197] usb 1-1.1: USB disconnect, device number 3
> [ 47.254348] usb 1-1.1: new full-speed USB device number 4 using xhci_hcd
> [ 47.361386] usb 1-1.1: New USB device found, idVendor=067b,
> idProduct=23a3, bcdDevice= 6.05
> [ 47.361402] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [ 47.361407] usb 1-1.1: Product: USB-Serial Controller
> [ 47.361412] usb 1-1.1: Manufacturer: Prolific Technology Inc.
> [ 47.361417] usb 1-1.1: SerialNumber: ALBAb115819
> [ 47.364081] pl2303 1-1.1:1.0: pl2303 converter detected
> [ 47.364106] pl2303 1-1.1:1.0: unknown device type, please report to
> linux-usb@vger.kernel.org
>
> so I followed the example and emailed this address!
>
> and with lsusb:
>
> lsusb -v
> Bus 001 Device 004: ID 067b:23a3 Prolific Technology, Inc. USB-Serial Controller
> Couldn't open device, some information will be missing
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass            0
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0        64
>   idVendor           0x067b Prolific Technology, Inc.
>   idProduct          0x23a3
>   bcdDevice            6.05
>   iManufacturer           1 Prolific Technology Inc.
>   iProduct                2 USB-Serial Controller
>   iSerial                 3 ALBAb115819
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength       0x0027
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0xa0
>       (Bus Powered)
>       Remote Wakeup
>     MaxPower              100mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           3
>       bInterfaceClass       255 Vendor Specific Class
>       bInterfaceSubClass      0
>       bInterfaceProtocol      0
>       iInterface              0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x000a  1x 10 bytes
>         bInterval               1
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x02  EP 2 OUT
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0040  1x 64 bytes
>         bInterval               0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x83  EP 3 IN
>         bmAttributes            2
>           Transfer Type            Bulk
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0040  1x 64 bytes
>         bInterval               0
>
> Any help much appreciated. Thanks
>
> Giles Roadnight
> http://giles.roadnight.name

Re: Prolific Technology pl2303: unknown device type

[Johan Hovold]

On Sat, Jun 18, 2022 at 07:42:43AM +0100, Giles Roadnight wrote:
> Hi
> 
> I am trying to connect a Prolific pl2303 to my raspberry pi 4 running
> raspberry pi os 64 bit. When I look at dmesg I get the following
> output:
> 
> [ 31.714397] cam-dummy-reg: disabling
> [ 44.046197] usb 1-1.1: USB disconnect, device number 3
> [ 47.254348] usb 1-1.1: new full-speed USB device number 4 using xhci_hcd
> [ 47.361386] usb 1-1.1: New USB device found, idVendor=067b,
> idProduct=23a3, bcdDevice= 6.05
> [ 47.361402] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [ 47.361407] usb 1-1.1: Product: USB-Serial Controller
> [ 47.361412] usb 1-1.1: Manufacturer: Prolific Technology Inc.
> [ 47.361417] usb 1-1.1: SerialNumber: ALBAb115819
> [ 47.364081] pl2303 1-1.1:1.0: pl2303 converter detected
> [ 47.364106] pl2303 1-1.1:1.0: unknown device type, please report to
> linux-usb@vger.kernel.org
> 
> so I followed the example and emailed this address!
> 
> and with lsusb:

This has been fixed in mainline and backported to the relevant stable
trees (5.17.2, 5.16.19, 5.15.33) at the beginning of April.

You didn't mention which kernel you use, but updating to a more recent
one should fix this.

Johan

Re: Prolific Technology pl2303: unknown device type

[Giles Roadnight]

Yes thanks. The new kernel has not made it to the default raspberry pi
repos yet so doing apt upgrade does not fix it. I did find a tool that
does update the kernel in an "unsafe" way and that has fixed it for
me.
I know that raspberry pi OS and its versions and repositories are not
your concern as you work on the kernel but as a linux simpleton these
were the issues preventing me from getting the update!
Thanks for your response.

Giles Roadnight
http://giles.roadnight.name

On Mon, 20 Jun 2022 at 08:05, Johan Hovold <johan@kernel.org> wrote:
>
> On Sat, Jun 18, 2022 at 07:42:43AM +0100, Giles Roadnight wrote:
> > Hi
> >
> > I am trying to connect a Prolific pl2303 to my raspberry pi 4 running
> > raspberry pi os 64 bit. When I look at dmesg I get the following
> > output:
> >
> > [ 31.714397] cam-dummy-reg: disabling
> > [ 44.046197] usb 1-1.1: USB disconnect, device number 3
> > [ 47.254348] usb 1-1.1: new full-speed USB device number 4 using xhci_hcd
> > [ 47.361386] usb 1-1.1: New USB device found, idVendor=067b,
> > idProduct=23a3, bcdDevice= 6.05
> > [ 47.361402] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > [ 47.361407] usb 1-1.1: Product: USB-Serial Controller
> > [ 47.361412] usb 1-1.1: Manufacturer: Prolific Technology Inc.
> > [ 47.361417] usb 1-1.1: SerialNumber: ALBAb115819
> > [ 47.364081] pl2303 1-1.1:1.0: pl2303 converter detected
> > [ 47.364106] pl2303 1-1.1:1.0: unknown device type, please report to
> > linux-usb@vger.kernel.org
> >
> > so I followed the example and emailed this address!
> >
> > and with lsusb:
>
> This has been fixed in mainline and backported to the relevant stable
> trees (5.17.2, 5.16.19, 5.15.33) at the beginning of April.
>
> You didn't mention which kernel you use, but updating to a more recent
> one should fix this.
>
> Johan

Re: Prolific Technology pl2303: unknown device type

[Johan Hovold]

On Mon, Jun 20, 2022 at 08:10:22AM +0100, Giles Roadnight wrote:
> Yes thanks. The new kernel has not made it to the default raspberry pi
> repos yet so doing apt upgrade does not fix it. I did find a tool that
> does update the kernel in an "unsafe" way and that has fixed it for
> me.

Good to hear you found a way to resolve this.

Johan