xerox_mfp: Add support for Samsung SCX-4521F. #707

ValdikSSrequested to merge
ValdikSS1/backends:xerox_mfp-4521f-fixes into master

This is the patchset from Marc Schink, originally posted in the mailing list:
https://alioth-lists.debian.net/pipermail/sane-devel/2017-January/034987.html

Hi,

I have attached three patches for the xerox_mfp driver. The first one is for general support of the Samsung SCX-4521F scanner. The second is some minor code cleanup only. The last one fixes some (general?) issue for the driver in halftone and lineart mode.

I have tested the new driver with the Samsung SCX-4521F exhaustively with all resolutions and modes as well as from ADF and flatbed source. I have uploaded some of the results:

In my opinion the device can now be stated at least as "Good" in the list of supported devices.

Best regards, Marc

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