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<!-- received="Tue Mar 9 19:14:41 1999 PST" -->
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<!-- sent="Wed, 10 Mar 1999 01:26:30 +0100 (MET)" -->
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<!-- name="becka@rz.uni-duesseldorf.de" -->
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<!-- email="becka@rz.uni-duesseldorf.de" -->
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<!-- subject="Re: action on IRQs outside the kernel" -->
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<!-- id="m10KWpS-000CFmC@hades.beck-sw.de" -->
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<title>sane-devel: Re: action on IRQs outside the kernel</title>
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<h1>Re: action on IRQs outside the kernel</h1>
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<a href="mailto:becka@rz.uni-duesseldorf.de"><i>becka@rz.uni-duesseldorf.de</i></a><br>
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<i>Wed, 10 Mar 1999 01:26:30 +0100 (MET)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#104">[ date ]</a><a href="index.html#104">[ thread ]</a><a href="subject.html#104">[ subject ]</a><a href="author.html#104">[ author ]</a>
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<li> <b>Next message:</b> <a href="0105.html">ðàÿ : "Re: microtek ScanMaker X6 (EL)"</a>
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<li> <b>Previous message:</b> <a href="0103.html">John Brush: "Would like help w/Microtek E3, please"</a>
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<li> <b>In reply to:</b> <a href="0094.html">Andre Herms: "action on IRQs outside the kernel"</a>
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</ul>
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Hi !<br>
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<p>
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<i>> I have a question on Linux' IRQ handling. Is there a posibility </i><br>
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<i>> to recognize an IRQ by an user process. </i><br>
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<p>
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It is in theory possible, but I wouldn't recommend it.<br>
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<p>
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<i>> I wrote a driver for a scanner with controller card that handles data</i><br>
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<i>> transmision via IRQ. So I wrote a device driver for the linux kernel. </i><br>
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<p>
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That's what I'd do (have done) either.<br>
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<p>
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<i>> This is not the finest way because my sane backend depends on this </i><br>
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<i>> special kernel driver. </i><br>
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<p>
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Well - you might want to think about having a look at LHII which was<br>
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designed for the old handscanner devices (available in the logiscan<br>
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package, that should be on sunsite and tsx), and the SANE API (which you<br>
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probably know well), and we can try to make LHII-2 aka SANE-II (hmm -<br>
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I like the abigous II :-) for such cases ...<br>
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<p>
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<i>> Is it possible to get an IRQ from inside of my backend?</i><br>
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<p>
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First of all: There is _no_ stock kernel feature to do this.<br>
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The problem is, that you need to clear the interrupt condition, and this<br>
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requires knowing the issueing card well enough, inside the kernel.<br>
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<p>
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So basically you'd still need at least a minimal card-specific driver.<br>
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This driver could then of course wake up a process or send a signal to<br>
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it, but I don't see much gain over some nice driver.<br>
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<p>
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Usermode has lots of ugly issues for these things like pages being swapped<br>
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out (the handler ...), the process not being scheduled for too long, ...<br>
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<p>
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CU, ANdy<br>
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<p>
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<pre>
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--
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= Andreas Beck | Email : <<a href="mailto:andreas.beck@ggi-project.org">andreas.beck@ggi-project.org</a>> =
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<p>
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<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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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0105.html">ðàÿ : "Re: microtek ScanMaker X6 (EL)"</a>
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<li> <b>Previous message:</b> <a href="0103.html">John Brush: "Would like help w/Microtek E3, please"</a>
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<li> <b>In reply to:</b> <a href="0094.html">Andre Herms: "action on IRQs outside the kernel"</a>
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<!-- nextthread="start" -->
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</ul>
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