[sane-devel] Canon imageClass MFP's

Nicolas nicolas.martin at freesurf.fr
Sun Apr 20 09:37:45 UTC 2008


Hi Dennis,

Thanks for the work on the ImageClass backend, I've just browsed
the code and it looks close to mp730 one, but I think it's fine to
have ImageClass in a separate file, as it concerns a large number
devices.

I'll incorporate it in CVS soon, as I have currently under test, several
modifications for MP970.

Concerning the issues:

- Did you try also with Xsane ? I did not notice with Xsane the ADF and
ADF duplex issue (only ADF appears if duplex not declared), but I don't
use xscanimage. Could you test with Xsane and check if you have still
the ADF duplex issue ?

- Concerning the free issue, I just compared code with mp150 file, the
finish_scan () function does not contain free () statements, they are
included in the close () function. Maybe this is why the free () gets
executed twice.
I would suggest to do as in the mp150 finish scan () function, remove
the 2 lines in iclass_finish_scan:
     free (mf->buf);
     mf->buf = mf->lbuf = mf->imgbuf = NULL;
and let the close () function do the free statement. 
Could you test this ?

-For grayscale at 150 dpi, this is rather weird. Could it be related to
the free statements ?

Nicolas

Le samedi 19 avril 2008 à 23:28 -0700, Dennis Lou a écrit :
> Attached are diffs and code for the imageClass multi-functions.  
> As discussed, I created a separate pixma_imageclass.c as it seemed 
> different enough to warrant that approach.  I've run all combinations 
> of DPI and color along with several sizes and boundaries and everything 
> seems to be working.
> 
> However, there are a couple issues.  First, xscanimage shows options for 
> both ADF and ADF duplex when I've only specified PIXMA_CAP_ADF in the device table.  
> Second, glibc complains of a double free on (pixma_t *) s->subdriver->buf in 
> iclass_finish_scan() and hangs if I scan grayscale at 150DPI and only with this 
> combination.  I've traced the code and inserted debug statements and verified 
> that only 1 call to iclass_finish_scan() is occurring, so I'm pretty sure it is 
> not happening in my code.
> 
> Also, I've only  an MF4270 so all the other devices listed in the Windows 
> driver are completely untested.
> 
> -Dennis
> 
> ----- Original Message ----
> From: Nicolas <nicolas.martin at freesurf.fr>
> To: Dennis Lou <dlou99 at yahoo.com>
> Cc: sane-devel at lists.alioth.debian.org
> Sent: Thursday, April 17, 2008 2:31:44 PM
> Subject: Re: [sane-devel] Canon imageClass MFP's
> 
> Yep, after having a look at the log file you sent, messages look very
> similar to MP730 series ones, so it should be a good start point. 
> What might be more uncertain is the ADF management, this is a bit weak
> in the pixma backend. 
> Depending on modifications you add, you need to figure out if it could
> break code, or you could create, like in mp730_t structure, a
> mp->generation variable which can ease to separate differences between
> models.
> 
> Nicolas 
> 
> 
> Le jeudi 17 avril 2008 à 13:58 -0700, Dennis Lou a écrit :
> > I dug around some more and I think I've decoded most of the commands and protocols.
> >   Of the 3 pixma subfamilies, it most closely resembles the mp730.c code.  
> > Lamp/calibration/busy flags seem to be moved around a little but the has-paper 
> > flag seems the same (on a side note, I have yet to observe a cold lamp on this machine)
> >  and the step1() sequence is slightly different.  I think I have enough info to start 
> > writing the backend at this point.
> > 
> > I agree that a seperate pixma_imageclass.c is the easiest (don't have to worry about
> >  breaking existing code) and it'd be easier for end-users to find the right driver 
> > and/or add devices.  Besides, if imageclass should be merged to an existing file, so 
> > should mp150/mp730/mp750.  However, it might be close enough that all I have to do is 
> > add the USB PID's to mp730.c and change a couple lines here and there.
> > 
> > I will be sending snoop logs in a separate email shortly.
> > 
> > -Dennis
> > 
> > ----- Original Message ----
> > From: Nicolas <nicolas.martin at freesurf.fr>
> > To: Dennis Lou <dlou99 at yahoo.com>
> > Cc: sane-devel at lists.alioth.debian.org
> > Sent: Thursday, April 17, 2008 1:12:09 PM
> > Subject: Re: [sane-devel] Canon imageClass MFP's
> > 
> > Hi,
> > 
> > Currently maintaining the pixma backend, I can give you tips and
> > knowledge on it if you want to design a backend for those Canon MFPs. 
> > 
> > Especially if the protocol used by them is similar to the PIXMA
> > protocol, then it can be easy to integrate them either in the pixma
> > backend (the easiest, let's say as a separate pixma_ImageClass.c file
> > for instance), or in a separate imageclass backend, that would probably
> > use most of the pixma code.
> > 
> > To have a first idea of what it looks like, could you send me (at mail
> > address) a zipped USB snoop of a typical scan session under Windows
> > 
> > Then, we can discuss on the best solution to implement the backend.
> > 
> > Nicolas
> > 
> > Le mercredi 16 avril 2008 à 18:04 -0700, Dennis Lou a écrit :
> > > Hi,
> > > 
> > > I recently acquired a Canon imageClass MF4270 and am interested in contributing a sane backend for it.  This is my progress so far:
> > > 
> > > +Examined Windows driver package.  Found references to:
> > >     --Canon MF5650
> > >     --Canon MF5630
> > >     --Canon MF3110
> > >     --Canon MF8100
> > >     --Canon MF5730
> > >     --Canon MF5750
> > >     --Canon MF5770
> > >     --Canon MF6500 Series
> > >     --Canon MF3200 Series
> > >     --Canon MF4100 Series
> > >     --Canon MF4600 Series
> > >     --Canon MF4010 Series
> > >     --Canon MF4200 Series
> > > 
> > > +Ran sane-find-scanner -v -v
> > > +Ran cat /proc/bus/usb/devices
> > > +Created various logs using USB snooper in Windows
> > > +Isolated sections of log pertaining to connect, init, scan and de-init
> > > +Generated C code from logs and replayed USB commands in Linux
> > > +Reversed engineered some commands and responses
> > > +Modified C code to generate PNM/BMP files; performed scans from code
> > > 
> > > 
> > > 
> > > Attached are output from sane-find-scanner and /proc/bus/usb/devices
> > > 
> > > Looking at the logs, it seems very similar to the pixma MP series.
> > > 
> > > Is anybody else working on this series?
> > > 
> > > -Dennis
> > > 
> > > 
> > > 
> > > 
> > >       ____________________________________________________________________________________
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> > 
> > 
> > 
> > 
> > 
> > 
> >       ____________________________________________________________________________________
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> 
> 
>       ____________________________________________________________________________________
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