[sane-devel] Q: improving epson2 for Epson 12000XL
wsa at kernel.org
Sat Sep 26 20:44:06 BST 2020
> a) The scanner reports level "B8". For "B8", allowed brightness levels are in
> the -4..3 range. However, my scanner returns -EINVAL for -4. To avoid that,
> I guess I need to check the model name and adapt the range accordingly?
Fixed with !529.
> b) It seems to me that set_focus is not working for this model because
> e2_set_extended_scanning_parameters() says "/* XXX focus */" and no byte in
> the buffer is filled with the focus value. Probably the location is unknown?
> And I'd need to snoop Windows USB traffic to (hopefully) figure it out?
Fixed with !530.
> c) 'focus' has only two options. 0mm and 2.5mm. The hex values are 0x19 apart.
> That being dec 25, it is tempting to try inbetween values. But I assume I'd
> need some evidence that those values are "officially OK" somehow?
This and also autofocus added with !531. If someone has comments, I am
honestly looking forward to hear them. I am still new to the project.
The only question left for me now: Should focus/autofocus settings
really have CAP_ADVANCED?
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