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<TITLE>sane-devel: Re: use of ioperm in sane -> sanei_ppdev</TITLE>
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<META NAME="Author" CONTENT="Jochen Eisinger (jochen.eisinger@gmx.de)">
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<META NAME="Subject" CONTENT="Re: use of ioperm in sane -> sanei_ppdev">
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<H1>Re: use of ioperm in sane -> sanei_ppdev</H1>
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<!-- received="Mon Feb 12 10:46:09 2001" -->
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<!-- sent="Mon, 12 Feb 2001 19:47:37 +0100 (CET)" -->
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<!-- name="Jochen Eisinger" -->
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<!-- subject="Re: use of ioperm in sane -> sanei_ppdev" -->
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<STRONG>From:</STRONG> Jochen Eisinger (<A HREF="mailto:jochen.eisinger@gmx.de?Subject=Re:%20use%20of%20ioperm%20in%20sane%20->%20sanei_ppdev&In-Reply-To=<Pine.LNX.4.21.0102121944160.15427-100000@s118.sw-stusie.uni-freiburg.de>"><EM>jochen.eisinger@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Feb 12 2001 - 10:47:37 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0127.html">Tim Waugh: "Re: use of ioperm in sane"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0125.html">stef: "Re: use of ioperm in sane"</A>
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Hi!
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<BR>
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<P>The sanei_pa4s2 interface uses direct port io to communicate with the parallel
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port. I also considered using the ppdev interface, but I don't have the
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time to implement this, and don't have a kernel supporting this and only
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linux comes with this interface.
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<BR>
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<P>However, if there was something like a sanei_ppdev which could be used
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<BR>
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by all backends (if such ppdevs are available), I could easily add support
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<BR>
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for this to the sanei_pa4s2.
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<BR>
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<P><P>[stef]
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<BR>
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<P><EM>> On Mon, Feb 12, 2001 at 04:41:55PM +0000, Tim Waugh wrote:
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</EM><BR>
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<EM>> > The ppdev _interface_ has support for 32-bit EPP reads and writes (or
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</EM><BR>
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<EM>> > it might possibly need a PPFLAG ioctl to set PARPORT_EPP_FAST). The
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</EM><BR>
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<EM>> > implementation hasn't caught up with that yet, but that's a Small
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</EM><BR>
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<EM>> > Matter of Programming.
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > But 32-bit writes or 8-bit writes is just a speed thing rather than
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</EM><BR>
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<EM>> > something that makes it not work altogether, surely?
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Tim.
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</EM><BR>
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<EM>> > */
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Unfortunately, for parallel port scanner, transfer speed does matter.
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</EM><BR>
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<EM>> However, I planned to use ppdev to have correct handling of concurrent access to the
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</EM><BR>
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<EM>> parallel port, so when my beloved insl will be there, I will use it.
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</EM><BR>
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<EM>>
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</EM><BR>
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<P><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:%20use%20of%20ioperm%20in%20sane%20->%20sanei_ppdev&In-Reply-To=<Pine.LNX.4.21.0102121944160.15427-100000@s118.sw-stusie.uni-freiburg.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0127.html">Tim Waugh: "Re: use of ioperm in sane"</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>Mon Feb 12 2001 - 10:46:41 PST</EM>
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