Re: Drivers

Hi,
One way to move forward if you want help from others, is to create an issue
here: https://gitlab.com/sane-project/backends/-/issues
... and attach a USB capture trace. It would also provide a permanent
record for others to take it on at a later time if you do not take it
further.

Or you could send one to me directly and I could take a quick look to see
if I recognise it.

Cheers,
Ralph

On Fri, Nov 21, 2025 at 12:55 PM Djordje Dragic <[email protected]> wrote:

> Its ScanJet 3770. I'm currently using it with VueScan in Windows on qemu.
>
> On Fri, Nov 21, 2025 at 7:17 PM Ralph Little <[email protected]> wrote:
>
>> Hi,
>>
>> On Thu, Nov 20, 2025 at 10:00 AM Djordje Dragic <[email protected]>
>> wrote:
>>
>>> Can we use usb sniffer to help develop drivers? I got hp scanjet that is
>>> unsupported in linux.
>>>
>>
>> Yes, it is possible and commonly how it is done. Firstly, a developer
>> would probably want to know if the device uses a protocol that is already
>> supported.
>> Otherwise, writing a new backend is not very difficult but some knowledge
>> of the API is required. Usually, it is easier to take an existing backend
>> and modify it to suit, at least I found it so.
>>
>> Out of interest, which ScanJet do you have?
>>
>> Cheers,
>> Ralph
>>
>