[sane-devel] [PATCH] gt68xx-Backend: OpticSlim M12

[Gerhard Jaeger]

Hi,

On Thursday 29 September 2005 20:34, Henning Meier-Geinitz wrote:
> Hi,
> 
> On Thu, Sep 29, 2005 at 05:05:18PM +0200, Gerhard Jaeger wrote:
> > please find attached a patch to make the OpticSlim M12 scanner
> > work. Work here means, scan a sheet.
> 
> I have included the patch into CVS with some modifications. Please
> check if it still works. See below for details.
> 
> > Calibration is not available,
> 
> How does that work with sheet-fed scanners at all? Is there also some
> kind of calibration area? 

as Gerard already stated. there's an extra calibration sheed, which
needs to be scanned at the first time, then the settings are stored 
somewhere. 

> 
> > area selection is limited - positioning does currently not work.
> 
> That means that length and width can be changed but not tl-x and tl-y?

Yes and No. Need to do some more investigations on how to set tl-y, tl-x
seems to be fine.

> > The patch is meant as a starting point to make gt68xx based sheet-fed scanner 
> > work. It should apply to the current cvs.
> > 
> > @Henning: It's up to you to include it. Maybe some changes are needed - I'll
> >           test them.
> > 
> > Ciao,
> > Gerhard
> 
> > --- sane-backends/doc/descriptions/gt68xx.desc.orig	2005-09-27 11:19:02.000000000 +0200
> > +++ sane-backends/doc/descriptions/gt68xx.desc	2005-09-29 16:57:39.000000000 +0200
> 
> [...]
> 
> > +  if (s->dev->model->flags & GT68XX_FLAG_SHEET_FED)
> > +    {
> > +      s->val[OPT_BACKTRACK_LINES].w = 0x3f;
> > +      DISABLE (OPT_BACKTRACK_LINES);
> > +    }
> > +
> 
> Is it really necessary to disable that option unconditionally?
> Otherwise I would move the check for GT68XX_FLAG_SHEET_FED up to the
> normal setting of that option (normally 0x3f is used for CCD).

Hmmm, probably not.

> > -  RIE (gt68xx_scanner_calibrate (s, &scan_request));
> > +  if ( !(s->dev->model->flags & GT68XX_FLAG_SHEET_FED)) {
> > +	  RIE (gt68xx_scanner_calibrate (s, &scan_request));
> > +  }
> 
> I haven't changed that because coarse and fine calibration is turned
> off anyway for that scanner.

Okay!

> > --- sane-backends/backend/gt68xx_devices.c.orig	2005-09-27 11:18:57.000000000 +0200
> > +++ sane-backends/backend/gt68xx_devices.c	2005-09-29 11:29:05.000000000 +0200
> 
> I used a new command_set for sheet-fed types. this way we have more
> flexibility.

Tried that in my first approach, but failed - anyway I'll test the changes.

> Also there is one more level of indirection (always call
> gt68xx_device_*, not gt68xx_generic_* or gt68xx_gt6816_* directly).

Okay, I see.

> 
> > --- sane-backends/backend/gt68xx_generic.c.orig	2005-09-27 11:18:57.000000000 +0200
> > +++ sane-backends/backend/gt68xx_generic.c	2005-09-29 11:29:49.000000000 +0200
> > @@ -96,10 +96,17 @@ gt68xx_generic_read_scanned_data (GT68xx
> >  
> >    RIE (gt68xx_device_req (dev, req, req));
> >  
> > -  if (req[0] == 0)
> > -    *ready = SANE_TRUE;
> > +  *ready = SANE_FALSE;
> > +  if (dev->model->flags & GT68XX_FLAG_SHEET_FED)
> > +    {
> > +      if (req[0] == 0 && req[1] == 0x35 )
> > +	*ready = SANE_TRUE;
> > +    }
> 
> Is this really necessary? I know that 95% of the gt68xx scanners
> return 00 35 but I only test for 00 beacuse of the 5% which don't
> return the 35. If it also works with the test only for the 00, I would
> prefer to keep the old version. At the moment, i have apllied your
> patch, however.

Maybe it is not necessary - I'll test that too.

> 
> in gt68xx_geneirc_set_exposure-time:
> 
> > +  if (dev->model->flags & GT68XX_FLAG_SHEET_FED)
> > +    return SANE_STATUS_GOOD;
> > +
> 
> Not applied. Added a check in gt68xx_high.c instead.

Okay.

> > --- sane-backends/backend/gt68xx_gt6816.c.orig	2005-06-01 13:28:18.000000000 +0200
> > +++ sane-backends/backend/gt68xx_gt6816.c	2005-09-29 11:23:28.000000000 +0200
> > @@ -217,6 +217,9 @@ gt6816_carriage_home (GT68xx_Device * de
> >  {
> >    GT68xx_Packet req;
> >  
> > +  if (dev->model->flags & GT68XX_FLAG_SHEET_FED)
> > +    return SANE_STATUS_GOOD;
> > +
> 
> Not applied. Added checks in gt68xx.c instead.

Okay.

> 
> 
> In stop scan:
> >  {
> >    GT68xx_Packet req;
> >  
> > +  if (dev->model->flags & GT68XX_FLAG_SHEET_FED) 
> > +    {
> > +      memset (req, 0, sizeof (req));
> > +      req[0] = 0x42;
> > +      req[1] = 0x01;
> 
> Not applied. Used gt6801_stop_scan instead in the new command_set.

Okay - Thanks for the new version, I'll test that the next days.

Ciao,
Gerhard