[sane-devel] Support Avision 220C2+ scanner

[cbiolatti]

Hi Mike
I'm using the development version(1.0.24) with AV220C2+ scanner, but this 
scanner is not recognised by scanimage -L.

1 -I added in avision.c file  the following code:
    { NULL, NULL,
      0x0638, 0x0AB8,
      "Avision", "AV220C2+",
      AV_INT_BUTTON |  AV_CANCEL_BUTTON ,0},
    /* comment="duplex! sheetfed scanner" */
    /* status="complete" */

But not works ,i'm get the error code 9 (Error during device I/0) .
2 - I added the following code too:
    { NULL, NULL,
      0x0638, 0x0AB8,
      "Avision", "AV220C2+",
	 AV_INT_BUTTON |AV_GRAY_MODES ,0},
    /* comment="duplex! sheetfed scanner" */
    /* status="complete" */

but doesn't works.
I attach the log with the added code (avision.log) , with the code added 2 
(avision2.log ) and i attach
 without the code added(avision1.log)

Any idea?

Thanks!
Cecilia
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