[sane-devel] Lexmark X215 backend (patch)

[Andrzej Szombierski]

Hello everyone,

I got an old Lexmark X215 scanner/printer combo. The device is a 
rebranded Samsung and it didn't take much to convince the xerox_mfp 
backend to support it. I've made a preliminary patch (attached). I'm 
posting it in case anyone else is interested in getting this ancient 
device to work.

In case anyone would think it's a good idea to merge this, below is a 
summary of the oddities of this device and my patch.

1. It seems quite confusing to me, but both the printer and the scanner 
utilize the same set of BULK usb endpoints, on a Printer class 
interface. So they are skipped by sanei_usb. And even if they weren't, 
the interface is usually claimed by usblp.
2. To reduce interference with usblp, I've decided to utilize it instead 
(or is there a better way?) So I've added a new transport 
xerox_mfp-usblp. Instead of using sanei_usb (and libusb underneath), 
data is sent directly to the usblp device. On startup, the usual paths 
are searched for usblp devices (with vid/pid filtering to filter out 
only the Lexmark). The code is unlikely to work under a non-Linux OS
3. The scanner doesn't support CMD_OBJECT_POSITION. The windows driver 
doesn't send this command. I've added code to skip this command if the 
device model matches "SAMSUNG/ORION" (yes, that's the model name sent by 
the firmware).
4. On inquiry, the scanner returns zero values for maximum window height 
(both AFP and manual values). I'm using the max_win_len value instead.

Let me know if you have any comments.

-- 
Andrzej Szombierski

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