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<TITLE>sane-devel: Re: General USB questions and comments</TITLE>
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<META NAME="Author" CONTENT="Henning Meier-Geinitz (hmg-ml@gmx.de)">
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<META NAME="Subject" CONTENT="Re: General USB questions and comments">
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<H1>Re: General USB questions and comments</H1>
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<!-- received="Sun Jan 7 03:16:10 2001" -->
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<!-- sent="Sun, 7 Jan 2001 12:36:56 +0100" -->
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<!-- name="Henning Meier-Geinitz" -->
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20General%20USB%20questions%20and%20comments&In-Reply-To=<20010107123656.E14645@vortex.swb.de>"><EM>hmg-ml@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Jan 07 2001 - 03:36:56 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0078.html">Oliver Rauch: "Re: sane,saned und XSane/Windows"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0076.html">Henning Meier-Geinitz: "Re: need info and/or driver for symbios sym53c400A scsi adaptor"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0061.html">Oliver Neukum: "Re: General USB questions and comments"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0099.html">Oliver Neukum: "Re: General USB questions and comments"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0099.html">Oliver Neukum: "Re: General USB questions and comments"</A>
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<HR NOSHADE><P>
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<P>
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Hi,
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<BR>
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<P>On Sat, Jan 06, 2001 at 05:27:34PM +0100, Oliver Neukum wrote:
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<BR>
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<EM>> > Some questions (mostly based on Linux and the USB driver "scanner"):
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > * Is there any way to get the vendor and device ids for a given device
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</EM><BR>
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<EM>> > file name? One problem for SANE-USB backends is that they can't easily
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> No that I know of. Could you live with an IOCTL for that ?
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</EM><BR>
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<EM>> I wouldn't be hard to add to the kernel.
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</EM><BR>
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<P>I think this would be fine. With this addition we could implement
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<BR>
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something like
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<BR>
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usb 1000 0001
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<BR>
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for the backend.conf files to check the standard device files for this
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<BR>
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scanner.
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<BR>
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<P><EM>> > * For find-scanner the idea was to scan /proc/bus/usb/devices. Look for
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</EM><BR>
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<EM>> > new devices (starting with "T:" lines) and save all devices
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</EM><BR>
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<EM>> > containing an "I: ... Driver=usbscanner" line. Get vendor and
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</EM><BR>
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<EM>> > product ids from the "P:" line. Question: How to get the device file
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</EM><BR>
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<EM>> > from this information? Can I just assume that the first usbscanner entry
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> You can't. Device numbers depend on the order plugging in and out.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> > in this list is /dev/usbscanner0? Can the number of one device
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</EM><BR>
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<EM>> > change if another one is conncted?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> You cannot assume that the first device is usbscanner0. While a device is
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</EM><BR>
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<EM>> plugged in, it's device node doesn't change. Note: You can't tell easily
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</EM><BR>
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<EM>> whether it was replugged.
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</EM><BR>
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<P>I may be wrong but all this doesn't look like scanner.o had more then
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<BR>
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one scanner in mind. Looks pretty weird.
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<BR>
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<P>Bye,
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<BR>
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Henning
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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:%20General%20USB%20questions%20and%20comments&In-Reply-To=<20010107123656.E14645@vortex.swb.de>">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="0078.html">Oliver Rauch: "Re: sane,saned und XSane/Windows"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0076.html">Henning Meier-Geinitz: "Re: need info and/or driver for symbios sym53c400A scsi adaptor"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0061.html">Oliver Neukum: "Re: General USB questions and comments"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0099.html">Oliver Neukum: "Re: General USB questions and comments"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0099.html">Oliver Neukum: "Re: General USB questions and comments"</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>Sun Jan 07 2001 - 03:16:37 PST</EM>
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