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<TITLE>sane-devel: umax_pp_low: ppdev</TITLE>
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<META NAME="Author" CONTENT="Tim Waugh (twaugh@redhat.com)">
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<META NAME="Subject" CONTENT="umax_pp_low: ppdev">
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<H1>umax_pp_low: ppdev</H1>
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<!-- received="Wed Jun 6 01:38:14 2001" -->
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<!-- isoreceived="20010606083814" -->
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<!-- sent="Wed, 6 Jun 2001 09:41:46 +0100" -->
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<!-- isosent="20010606084146" -->
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<!-- name="Tim Waugh" -->
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<!-- email="twaugh@redhat.com" -->
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<!-- subject="umax_pp_low: ppdev" -->
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<!-- id="20010606094146.E26782@redhat.com" -->
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<STRONG>From:</STRONG> Tim Waugh (<A HREF="mailto:twaugh@redhat.com?Subject=Re:%20umax_pp_low:%20ppdev&In-Reply-To=<20010606094146.E26782@redhat.com>"><EM>twaugh@redhat.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Jun 06 2001 - 01:41:46 PDT
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<P>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0100.html">Henning Meier-Geinitz: "Re: size of xcam (was Re: Compiling on OS/2)"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0098.html">Stefan Nilsen: "HP Scanjet 2200C (USB) - Any info?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0110.html">stef: "Re: umax_pp_low: ppdev"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0110.html">stef: "Re: umax_pp_low: ppdev"</A>
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<HR NOSHADE><P>
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<!-- body="start" -->
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<P>
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In umax_pp_low, the following code is wrong:
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<BR>
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<P> /* me check if parport is does ECP */
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<BR>
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mode = IEEE1284_MODE_ECP;
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<BR>
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if (ioctl (fd, PPSETMODE, &mode))
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<BR>
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{
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<BR>
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DBG (16, "umax_pp: port '%s' hasn't ECP\n", parport_name);
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<BR>
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}
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<BR>
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<P>That isn't checking what the port can do at all, but what the driver
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<BR>
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will let you do. The successful PPSETMODE just means that the next
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<BR>
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write() you do will cause the driver to write the data out using ECP.
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<BR>
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<P>The only circumstance under which it might fail really is that
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<BR>
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<P>(a) the port doesn't have hardware ECP support, _AND_
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<BR>
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(b) the kernel's IEEE 1284 implementation wasn't configured when you
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<BR>
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built it
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<BR>
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<P>Then:
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<BR>
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<P> /* we try to set EPP 1.7 first */
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<BR>
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mode = IEEE1284_MODE_EPPSL;
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<BR>
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if (ioctl (fd, PPSETMODE, &mode))
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<BR>
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<P>The comment is wrong.
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<BR>
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<P>If you want to find out what the _hardware_ can do, you want to use
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<BR>
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the PPGETMODES ioctl (and treat errors as 'not telling you').
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<BR>
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<P>Tim.
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<BR>
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*/
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<BR>
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<P>
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<BR><HR NOSHADE>
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<UL>
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<LI>application/pgp-signature attachment: <A HREF="att-0099/01-part">stored</A>
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</UL>
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<!-- attachment="01-part" -->
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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:%20umax_pp_low:%20ppdev&In-Reply-To=<20010606094146.E26782@redhat.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0100.html">Henning Meier-Geinitz: "Re: size of xcam (was Re: Compiling on OS/2)"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0098.html">Stefan Nilsen: "HP Scanjet 2200C (USB) - Any info?"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0110.html">stef: "Re: umax_pp_low: ppdev"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0110.html">stef: "Re: umax_pp_low: ppdev"</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>Wed Jun 06 2001 - 01:41:08 PDT</EM>
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