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<TITLE>sane-devel: Re: SANE and general USB support</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: SANE and general USB support">
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<H1>Re: SANE and general USB support</H1>
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<!-- received="Wed Oct 11 09:34:07 2000" -->
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<!-- sent="Wed, 11 Oct 2000 18:32:24 +0200" -->
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<!-- name="Oliver Neukum" -->
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<!-- inreplyto="Springmail.105.971276415.0.74160200@www.springmail.com" -->
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<STRONG>From:</STRONG> Oliver Neukum (<A HREF="mailto:Oliver.Neukum@lrz.uni-muenchen.de?Subject=Re:%20SANE%20and%20general%20USB%20support&In-Reply-To=<00101118390301.01412@ghanima>"><EM>Oliver.Neukum@lrz.uni-muenchen.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Oct 11 2000 - 09:32:24 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0116.html">Lawrence Glaister: "Re: SANE and general USB support"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0114.html">abel deuring: "Re: SANE and general USB support"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0110.html">cbagwell@sprynet.com: "SANE and general USB support"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0116.html">Lawrence Glaister: "Re: SANE and general USB support"</A>
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<LI><STRONG>Messages sorted by:</STRONG>
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<A HREF="index.html#115">[ thread ]</A>
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</UL>
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<HR NOSHADE><P>
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<!-- body="start" -->
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<P>
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Am Mit, 11 Okt 2000 schrieben Sie:
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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>> I'm interested in improving USB support inside of SANE since I have a USB scanner (Acer 640BU). I'd like to see if anyone else is currently working in this area. I must admit I have only looked at version 1.0.3
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</EM><BR>
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(not CVS) and only about a months worth of the mailing list archive.
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<BR>
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<EM>>
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</EM><BR>
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<EM>> I see three main problems effecting current USB scanners in SANE. First, there is no generic support for USB like there is for SCSI (ie sanei_scsi.c).
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</EM><BR>
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This means that we can not override these functions to always return failure
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<BR>
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on platforms that do not support USB. At the least, this should mean that any
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<BR>
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USB scanner drivers will fail to compile on non-Linux platforms when USB kerenl
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<BR>
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functions are called. > > Next, there needs to be enhanced support in the
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<BR>
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sanei_config2.c files. They understand a SCSI keyword in config files and will
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<BR>
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search a /proc directory to find it. The same should be implemented for USB. >
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<BR>
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<EM> > Lastly, most of the scanner drivers are SCSI oriented and support placing
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</EM><BR>
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just a device name in the config like like /dev/scanner. The problem here is
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<BR>
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that we do not do any error checking inside of scsi open() functions to make
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<BR>
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sure its actually a SCSI device. We also immediately start doing SCSI related
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<BR>
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ioctl() calls. Since /dev/scanner is a generic link, on systems with USB
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<BR>
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scanners we start doing SCSI ioctl()'s during scans to see whats out there.
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<BR>
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This tends to lock up the current versions of the USB kernel code (well, it
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<BR>
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takes minutes for it to time out anyways). > > I'd like to address these 3
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<BR>
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issues. Is it OK for me to start hacking the sanei directory or should I
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<BR>
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discuss some designs with someone? > > Thanks, > Chris
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<BR>
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<P>Hi,
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<BR>
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<P>David Nelson for the generic usb scanner kernel driver, would be one to speak
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<BR>
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to.
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<BR>
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There are no kernel level usb calls. The usbscanner driver will transfer to
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<BR>
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the scanner what you write() and read from the scanner what you read().
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<BR>
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You can hardly make such things fail at compile time.
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<BR>
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<P>You could scan /proc/bus/usb/devices.
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<BR>
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Do you think that a backend can operate on scsi and usb
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<BR>
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without knowing about differences in the busses ?
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<BR>
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<P> 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:%20SANE%20and%20general%20USB%20support&In-Reply-To=<00101118390301.01412@ghanima>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0116.html">Lawrence Glaister: "Re: SANE and general USB support"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0114.html">abel deuring: "Re: SANE and general USB support"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0110.html">cbagwell@sprynet.com: "SANE and general USB support"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0116.html">Lawrence Glaister: "Re: SANE and general USB support"</A>
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<SMALL>
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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>Wed Oct 11 2000 - 10:29:24 PDT</EM>
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