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73 wiersze
3.6 KiB
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<!-- received="Fri Dec 3 05:53:19 1999 PST" -->
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<!-- sent="Fri, 03 Dec 1999 09:02:36 -0500" -->
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<!-- name="Douglas Gilbert" -->
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<!-- email="dgilbert@interlog.com" -->
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<!-- subject="Re: Problem with SANE and SCSI scanner" -->
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<!-- inreplyto="Problem with SANE and SCSI scanner" -->
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<title>sane-devel: Re: Problem with SANE and SCSI scanner</title>
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<h1>Re: Problem with SANE and SCSI scanner</h1>
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<b>Douglas Gilbert</b> (<a href="mailto:dgilbert@interlog.com"><i>dgilbert@interlog.com</i></a>)<br>
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<i>Fri, 03 Dec 1999 09:02:36 -0500</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#35">[ date ]</a><a href="index.html#35">[ thread ]</a><a href="subject.html#35">[ subject ]</a><a href="author.html#35">[ author ]</a>
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<li> <b>Next message:</b> <a href="0036.html">Tim Carroll: "hexadecimal C syntax for serial ports"</a>
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<li> <b>Previous message:</b> <a href="0034.html">Douglas Gilbert: "Re: detrammage"</a>
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</ul>
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abel deuring wrote:<br>
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<i>> </i><br>
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<i>> Manuel Panea wrote:</i><br>
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<i>> </i><br>
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<i>> > Now for the backend problem at hand: I could of course do those sg ioctl's</i><br>
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<i>> > in the backend, but that should rather be done by sane, not by the</i><br>
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<i>> > backends. Do you perhaps know whether there are any development plans for</i><br>
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<i>> > sane to include support for such ioctl's?</i><br>
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<i>> </i><br>
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<i>> If you need a quick fix, you might try Douglas's SG driver version 3</i><br>
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<i>> (<a href="http://www.torque.net/sg">http://www.torque.net/sg</a>) in combination with the modifications to</i><br>
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<i>> sanei_scsi.c which I posted some weeks ago on this mailing list. While</i><br>
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<i>> these modifiactions were mainly intended to benefit from other</i><br>
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<i>> improvements in the SG driver (it is possible to omit a buffer in</i><br>
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<i>> sanei_scsi.c for the data read from the scanner), they should also fix</i><br>
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<i>> the problem, that the SG driver must guess the length of SCSI commands.</i><br>
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<i>> (Douglas, please correct me if I am wrong, but I think that with the new</i><br>
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<i>> header structure, the SG driver takes the length of the SCSI command</i><br>
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<i>> from sg_io_hdr.cmd_len.)</i><br>
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<p>
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That is correct. Unfortunately SCSI 3 16 byte commands are<br>
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not yet supported by Linux but with the sg_io_hdr structure<br>
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that is not a sg interface restriction (rather a Linux scsi<br>
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mid-level restriction that may later be relaxed).<br>
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<p>
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Since the sg "version 3" driver is not even in the Linux 2.3<br>
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development tree yet, it is probably a bit premature to ask<br>
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people maintaining backends to use it. [Of course I don't mind<br>
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if they do and it is probably a better solution than asking<br>
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end users to edit Linux device drivers.] The common sane <br>
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backend for Linux could however be changed to detect such <br>
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things (e.g. a 6 byte 0xd5 command) and if the sg driver <br>
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supports SG_NEXT_CMD_LEN then use it and if it doesn't then <br>
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return an error. <br>
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<p>
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Doug Gilbert<br>
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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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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a>
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</pre>
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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="0036.html">Tim Carroll: "hexadecimal C syntax for serial ports"</a>
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<li> <b>Previous message:</b> <a href="0034.html">Douglas Gilbert: "Re: detrammage"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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