[sane-devel] [RFC][PATCHES] adding MD5345/MD6471 to genesys backend

[svoltz@wanadoo.fr]

	Hello,

	here are as set of patches that add the MEDION MD5345/MD6228/MD6471
to the experimental genesys backend.

	The first patch adds on ly the new model so that it can be
detected: http://perso.wanadoo.fr/septieme/MD6471/00_add_md5345.patch
I think it is OK to check in, but I'd wish other people working on the
genesys backend to have a look first.

	The second http://perso.wanadoo.fr/septieme/MD6471/01_misc_fixes.patch
contains would be fixes in registers init:
	- memset regs so that we are sure that unset registers are zeroed
	- disable gamma in R05, since we don't use it yet
	- init R06

	The third 
	http://perso.wanadoo.fr/septieme/MD6471/02_add_gpo_struct.patch
adds a Genesy_Gpo struct to manage GPO differences between models, in the same
way that Genesys_Sensor does for sensor.

	BTW, I have a few questions to ask:
	- does writting 0x00 to R0e is enough to reset the ASIC ? The MD6471
	  driver writes 0x01.
	- as anyone allready thought of how to handle the differences between
	  the motors ?
	- and last, what is the start point for y_offset_calib and 
	  x_offset_mark ? I disassembled the scanner and I know where 
	  they are placed, but I need to translate it into useful values.

Regards,
	Stef