# mustek: timeout after scan

Kolja Waschk (kawk@Home.Yo.COM)
19 Jul 97 01:46:43 +0200

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Kolja> environment: linux 2.0.29, sane 0.61, mustek mfs-12000sp
Kolja> (fw 1.02), tekram dc390 scsi w/tekram driver 1.11

Kolja> 1. After a scan is complete and also most times when
Kolja> 'scanimage' is stopped by ctrl-c, I get a scsi timeout after
Kolja> 10 minutes) in return to the last scsi stop command sent
Kolja> by the mustek backend (in stop_scan()).

DM> Hmmh, this is the first time I hear of such a problem. Is the
DM> tekram driver relatively new? I know things work fine with the
DM> ncr810 and several other scsi adapters, so I'm inclined to think
DM> that this might be a problem with the SCSI driver.

DM> Can you try with another controller?

I have no other one here, and I couldn't make the DTC3181 controller - that
came with my scanner - work with Linux (it's not the one supported by the ncr
driver fix). The Tekram controller is 53C974-based but has an own driver.

The low-level driver source is poorly documented, I didn't find any hints on
modifying timeout behaviour there. A 10 minute timeout is quite long...

Anyway, it's now working for me - not perfectly, but at least a delay, long
enough to wait for the scanner having returned the carriage to its home
position, before the stop command is sent, allows normal operation.

my stop_scan() now looks like this:

static SANE_Status
stop_scan (Mustek_Scanner *s)
{
sleep( (int)(SANE_UNFIX(s->val[OPT_TL_Y].w) +
SANE_UNFIX (s->val[OPT_BR_Y].w)) / 25 + 2 );

return sanei_scsi_cmd (s->fd, stop, sizeof (stop), 0, 0);
}

Aborting the scan while the scanner is in the setup phase (ie. no image data
has been transferred at all) still causes a timeout, and I haven't found the
right place to insert a delay for this problem yet (if a delay can solve it).

But I can live with it the way it works now.

bibi,
Kolja

    ---
    Kolja Waschk (kawk@Home.Yo.COM)
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