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<H1>Re: problems with Canon scanner</H1>
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<STRONG>From:</STRONG> abel deuring (<A HREF="mailto:a.deuring@satzbau-gmbh.de?Subject=Re:%20problems%20with%20Canon%20scanner&In-Reply-To=&lt;390E98DD.1339CD07@satzbau-gmbh.de&gt;"><EM>a.deuring@satzbau-gmbh.de</EM></A>)<BR>
<STRONG>Date:</STRONG> Tue May 02 2000 - 01:59:09 PDT
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Douglas Gilbert wrote:
<BR>
<P><EM>&gt; Since (and including) lk 2.2.10 it has been possible for the
</EM><BR>
<EM>&gt; Canon backend to override the SCSI command length as noted
</EM><BR>
<EM>&gt; above. The SG_GET_VERSION_NUM ioctl() can be used to find the
</EM><BR>
<EM>&gt; sg version number. So it is possible for the Canon backend
</EM><BR>
<EM>&gt; to use these and save the end user from striking these type
</EM><BR>
<EM>&gt; of problems in recent distributions.
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; So the bug was fixed 9 months ago. IMHO the Canon backend
</EM><BR>
<EM>&gt; should have picked this up by now.
</EM><BR>
<P>Douglas,
<BR>
<P>it is not only a problem of or for the Canon backend, it is also a
<BR>
problem of the sanei_scsi-library. With the functions sanei_scsi_cmd and
<BR>
sanei_scsi_req_enter, it is not possible to explicitly set the command
<BR>
length.
<BR>
<P>What would be needed, is either a modified version of these functions
<BR>
which has the SCSI command length as an additional parameter, or -
<BR>
similar to the way the SG driver works - an additional function that
<BR>
sets the length of the next command.
<BR>
<P>For compatibility, I would prefer the latter, something like
<BR>
sanei_scsi_set_cmd_len(int fd, int len). This should fix the problems of
<BR>
the Canon backend for Linux, but I don't know, if or how this can be
<BR>
handled for the other operating systems supported by Sane.
<BR>
<P>Abel
<BR>
<P><PRE>
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