[sane-devel] GPL driver for Samsung SCX-4200 MFP

[Julien BLACHE]

ABC <abc at telekom.ru> wrote:

(resending to list)

Hi,

>> I've just tested xerox_mfp on the 1815dn, and it works very well,
>> although I've had two segfaults with XSane. It could be related to
>> SANE 1.1, though. A color scan from the ADF will segfault midway;
>> although the backtrace seems to indicate it's an XSane issue, it also
>> looks like the stack is broken.
>
> You may send valgrind log file to me for analysis.

I'm not sure the backend is at fault. scanimage doesn't segfault like
XSane does, which would indicate a problem in XSane. But I'll look
into it.

>> Other than that, the backend is conflicting with usblp to claim the
>> USB device; do you have a way to fix that? Would going over the
>> emulated parallel port be possible?
>
> Strangely, as I'm using standard SANE interface to communicate with usb
> device. About parallel port - my device is only using usb, so I really
> don't know much to help about parallel ports.

The Samsung driver goes over the parallel port, so if the machines are
the same, the xerox should support that mode too, I guess?

>> I don't really care as I'm printing over the network anyway and use
>> USB only for scanning, so I can always blacklist usblp, but not
>> everybody can do that :/
>
> Any suggestions from your experience how to resolve that?

libusb provides a function to unbind the kernel driver from the
device, but then you lose printing if you're printing over USB.

Unbinding and rebinding afterwards could be a workaround if rebinding
is actually possible, but you'd have to unbind/discover/rebind in
sane_get_devices and unbind in sane_open then rebind in sane_close.

This will also "break" copy scripts and XSane's copy mode as the
printer won't be available while the scanner is open (as in
sane_open).

This all look pretty suboptimal :/

MFP have always been an issue :(

JB.

-- 
Julien BLACHE                                   <http://www.jblache.org> 
<jb at jblache.org>                                  GPG KeyID 0xF5D65169