sane-project-website/old-archive/1998-04/0189.html

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<title>sane-devel: Re: /proc/scsi/scsi</title>
<h1>Re: /proc/scsi/scsi</h1>
<b>Sean Reifschneider</b> (<a href="mailto:jafo@tummy.com"><i>jafo@tummy.com</i></a>)<br>
<i>Sat, 18 Apr 1998 13:48:51 -0600</i>
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I have given this quite a bit of thought over the years.  When we first<br>
started selling XVScan for Linux, we were getting quite a high percentage<br>
of support calls that were basically just scanner setup problems...<br>
Once I got a fairly robust install script created, they have essentially<br>
dropped off to zero.<br>
<p>
The problem is more general than just scanners though.  It affects other<br>
devices as well (such as CD-ROM writers, etc...).  In XVScan, the install<br>
"helper" program is designed such that it can be run at every boot from<br>
the rc scripts in case the scanner has moved.<br>
<p>
But what you really want is a program that will walk through the<br>
connected SCSI devices and takes action based on a configuration<br>
file, something like the following:<br>
<p>
	VENDOR="HP" MODEL="*" TYPE=3 CREATE=/dev/scanjet? PERMS=660:root:floppy<br>
	VENDOR="*" MODEL="*" TYPE=6 CREATE=/dev/scanner? PERMS=660:root:floppy<br>
	VENDOR="YAMAHA" MODEL="*" TYPE=&lt;cd-writer-type&gt; CREATE=/dev/cdwriter?<br>
			PERMS=660:root:floppy<br>
<p>
Using regular expressions is of course useful.  The CREATE directive would<br>
specify what device file names to create ("filename?" tells the program to<br>
create "filename0" for the first found instance, "filename1" for the second,<br>
etc...).  This would also allow you to specify the permissions and owners.<br>
<p>
The problem with just linking "/dev/scanner" to "/dev/sgX" is that the sg<br>
device files RARELY have the proper permissions for scanning as a user.<br>
<p>
Scanner detection can be a problem though.  Linux isn't so hard, but<br>
try looking for a scanner on the second bus of an HP workstation...<br>
<p>
Sean<br>
<pre>
-- 
 "If all you have is a hammer, every problem tends to look like a nail."
Sean Reifschneider, Inimitably Superfluous &lt;<a href="mailto:jafo@tummy.com">jafo@tummy.com</a>&gt;
URL: &lt;<a href="http://www.tummy.com/xvscan">http://www.tummy.com/xvscan</a>&gt; HP-UX/Linux/FreeBSD/BSDOS scanning software.
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<li> <b>Next message:</b> <a href="0190.html">Dave Restall - System Administrator: "Scanace II Technical Details"</a>
<li> <b>Previous message:</b> <a href="0188.html">Kevin Dalley: "Custom gamma table causes undesired distortions in Astra 1200S"</a>
<li> <b>In reply to:</b> <a href="0098.html">Oliver.Rauch@Wolfsburg.DE: "Re: /proc/scsi/scsi"</a>
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