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<TITLE>sane-devel: Re: General USB questions and comments</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: General USB questions and comments">
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<H1>Re: General USB questions and comments</H1>
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<!-- received="Sat Jan 6 08:18:42 2001" -->
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<!-- name="Oliver Neukum" -->
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<!-- subject="Re: General USB questions and comments" -->
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<STRONG>From:</STRONG> Oliver Neukum (<A HREF="mailto:Oliver.Neukum@lrz.uni-muenchen.de?Subject=Re:%20General%20USB%20questions%20and%20comments&In-Reply-To=<01010617403100.02022@ghanima>"><EM>Oliver.Neukum@lrz.uni-muenchen.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sat Jan 06 2001 - 08:27:34 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0062.html">Hugo.van.der.Kooij@caiw.nl: "Re: RPM packaging in progress"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0060.html">Eugene Kanter: "Re: RPM packaging in progress"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0058.html">Henning Meier-Geinitz: "General USB questions and comments"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0077.html">Henning Meier-Geinitz: "Re: General USB questions and comments"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0077.html">Henning Meier-Geinitz: "Re: General USB questions and comments"</A>
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<HR NOSHADE><P>
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<!-- body="start" -->
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<P>
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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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<P>No that I know of. Could you live with an IOCTL for that ?
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<BR>
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I wouldn't be hard to add to the kernel.
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<BR>
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<P><EM>> * What's the meaning of the other files under /proc/bus/usb/? I'm
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</EM><BR>
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<EM>> talking of e.g. 001/001.
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</EM><BR>
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<P>These are the USB equivalent of sg devices. You are supposed to use
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<BR>
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them with the aid of libusb.
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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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<P>You can't. Device numbers depend on the order plugging in and out.
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<BR>
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<P><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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<P>You cannot assume that the first device is usbscanner0. While a device is
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<BR>
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plugged in, it's device node doesn't change. Note: You can't tell easily
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<BR>
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whether it was replugged.
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<BR>
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<P> HTH
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<BR>
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Oliver Neukum
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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=<01010617403100.02022@ghanima>">majordomo@mostang.com</A>
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</PRE>
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<HR NOSHADE>
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<UL>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0062.html">Hugo.van.der.Kooij@caiw.nl: "Re: RPM packaging in progress"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0060.html">Eugene Kanter: "Re: RPM packaging in progress"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0058.html">Henning Meier-Geinitz: "General USB questions and comments"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0077.html">Henning Meier-Geinitz: "Re: General USB questions and comments"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0077.html">Henning Meier-Geinitz: "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>Sat Jan 06 2001 - 08:19:14 PST</EM>
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