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<TITLE>sane-devel: Re: Linux Support for Current Microtek Scanners</TITLE>
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<META NAME="Author" CONTENT="Oliver Neukum (Oliver.Neukum@lrz.uni-muenchen.de)">
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<META NAME="Subject" CONTENT="Re: Linux Support for Current Microtek Scanners">
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<H1>Re: Linux Support for Current Microtek Scanners</H1>
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<!-- received="Sat Nov 18 01:47:48 2000" -->
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<!-- isoreceived="20001118094748" -->
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<!-- sent="Sat, 18 Nov 2000 11:01:39 +0100" -->
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<!-- isosent="20001118100139" -->
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<!-- name="Oliver Neukum" -->
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<!-- email="Oliver.Neukum@lrz.uni-muenchen.de" -->
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<!-- subject="Re: Linux Support for Current Microtek Scanners" -->
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<!-- id="00111811013901.00357@ghanima" -->
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<!-- inreplyto="007f01c05103$59ba30a0$740d10ac@kwleenotebook" -->
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<STRONG>From:</STRONG> Oliver Neukum (<A HREF="mailto:Oliver.Neukum@lrz.uni-muenchen.de?Subject=Re:%20Linux%20Support%20for%20Current%20Microtek%20Scanners&In-Reply-To=<00111811013901.00357@ghanima>"><EM>Oliver.Neukum@lrz.uni-muenchen.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sat Nov 18 2000 - 02:01:39 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0230.html">Jochen Eisinger: "Re: TODO list"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0228.html">Marcel Pol: "RE: Linux Support for Current Microtek Scanners"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0226.html">kwlee: "Re: Linux Support for Current Microtek Scanners"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0228.html">Marcel Pol: "RE: Linux Support for Current Microtek Scanners"</A>
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<HR NOSHADE><P>
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<P>
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On Saturday 18 November 2000 01:24, you wrote:
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<BR>
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<EM>> Hi,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> > If you are talking USB, you need to talk to me.
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</EM><BR>
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<EM>> > Current status might be interresting to you.
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</EM><BR>
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<EM>> > X6 basically works, but is buggy.
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</EM><BR>
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<EM>> > No other USB scanner you make is known to
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</EM><BR>
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<EM>> > work. In fact two models are known not to work.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> This is pretty good that someone else talking about USB scanners!
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</EM><BR>
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<EM>> As you maybe know i implemented Visioneer 8600 USB scanner
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</EM><BR>
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<EM>> by modifying kernel usb/scanner.c and all backend parts
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</EM><BR>
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<P>I've just scanned through the modified scanner.c you provide,
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<BR>
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but it seems to me that it still can deal only with the 2 bulk
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<BR>
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and optionally one interrupt type of scanner.
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<BR>
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Could you explain your changes ?
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<BR>
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<P><EM>> Since the original usb/scanner.c only implement read/write bulks, this is
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</EM><BR>
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<EM>> definitely not enough for most of currently usb scanners, and this could be
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</EM><BR>
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<EM>> the main reason that so few usb linux drivers for usb scanners.
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</EM><BR>
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<P>Yes definitely. scanner.c is a nice driver, but working only for a limited
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<BR>
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number of scanners.
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<BR>
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Furthermore I strongly think that it is undesirable to have one kernel driver
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<BR>
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for all USB scanners. That driver would be a complex monster, an
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<BR>
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agglomeration of drivers that have no internal connection.
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<BR>
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<P>Yet it is hard to write such kernel drivers without documentation.
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<BR>
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scanner.c avoided that issue by being a driver for scanners that
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<BR>
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need almost no driver. Beauty and limitations of that driver are its
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<BR>
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simplicity.
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<BR>
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<P><EM>> I modify the usb/scanner.c according to the kernel driver in MS WINDOWS
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</EM><BR>
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<EM>> or the usbscan.sys inorder to have same data structure as ISV use, so
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</EM><BR>
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<EM>> people can speak same language about usb scanners.Anyway, my effort is
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</EM><BR>
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<EM>> still not enough, we still need people join in to make usb/scanner.c full
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</EM><BR>
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<EM>> functional.
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</EM><BR>
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<P>You are right. A backend should not need to care what it's operating on.
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<BR>
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That's an issue for SANE's core or even the kernel driver.
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<BR>
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<P>All kernel drivers other than scanner.c (or drivers closely based on it)
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<BR>
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are SCSI devices to user space.
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<BR>
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This is not an emulation for SANE's sake, but these scanners are really
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<BR>
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modified SCSI scanners.
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> If you are interested about the effort i do about usb/scanner.c, please:
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</EM><BR>
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<EM>> www.abaforum.es/martim/bird/otlinux.htm
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</EM><BR>
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<EM>> Note, I'm going to move the web to other place...
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</EM><BR>
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<P>Please elaborate and keep me posted, possibly off list, should there be no
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<BR>
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general interest.
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<BR>
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<P> Regards
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<BR>
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Oliver
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Linux%20Support%20for%20Current%20Microtek%20Scanners&In-Reply-To=<00111811013901.00357@ghanima>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0230.html">Jochen Eisinger: "Re: TODO list"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0228.html">Marcel Pol: "RE: Linux Support for Current Microtek Scanners"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0226.html">kwlee: "Re: Linux Support for Current Microtek Scanners"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0228.html">Marcel Pol: "RE: Linux Support for Current Microtek Scanners"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sat Nov 18 2000 - 01:48:07 PST</EM>
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