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LKML: Jan Engelhardt: Re: RFC: add udev support to parport_pc

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>LKML: Jan Engelhardt: Re: RFC: add udev support to parport_pc</title><link href="/css/message.css" rel="stylesheet" type="text/css" /><link href="/css/wrap.css" rel="alternate stylesheet" type="text/css" title="wrap" /><link href="/css/nowrap.css" rel="stylesheet" type="text/css" title="nowrap" /><link href="/favicon.ico" rel="shortcut icon" /><script src="/js/simple-calendar.js" type="text/javascript"></script><script src="/js/styleswitcher.js" type="text/javascript"></script><link rel="alternate" type="application/rss+xml" title="lkml.org : last 100 messages" href="/rss.php" /><link rel="alternate" type="application/rss+xml" title="lkml.org : last messages by Jan Engelhardt" href="/groupie.php?aid=24612" /><!--Matomo--><script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(["setDoNotTrack", true]); _paq.push(["disableCookies"]); _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//m.lkml.org/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '1']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script><!--End Matomo Code--></head><body onload="es.jasper.simpleCalendar.init();" itemscope="itemscope" itemtype="http://schema.org/BlogPosting"><table border="0" cellpadding="0" cellspacing="0"><tr><td width="180" align="center"><a href="/"><img style="border:0;width:135px;height:32px" src="/images/toprowlk.gif" alt="lkml.org" /></a></td><td width="32">聽</td><td class="nb"><div><a class="nb" href="/lkml"> [lkml]</a> 聽 <a class="nb" href="/lkml/2005"> [2005]</a> 聽 <a class="nb" href="/lkml/2005/12"> [Dec]</a> 聽 <a class="nb" href="/lkml/2005/12/31"> [31]</a> 聽 <a class="nb" href="/lkml/last100"> [last100]</a> 聽 <a href="/rss.php"><img src="/images/rss-or.gif" border="0" alt="RSS Feed" /></a></div><div>Views: <a href="#" class="nowrap" onclick="setActiveStyleSheet('wrap');return false;">[wrap]</a><a href="#" class="wrap" onclick="setActiveStyleSheet('nowrap');return false;">[no wrap]</a> 聽 <a class="nb" href="/lkml/mheaders/2005/12/31/109" onclick="this.href='/lkml/headers'+'/2005/12/31/109';">[headers]</a>聽 <a href="/lkml/bounce/2005/12/31/109">[forward]</a>聽 </div></td><td width="32">聽</td></tr><tr><td valign="top"><div class="es-jasper-simpleCalendar" baseurl="/lkml/"></div><div class="threadlist">Messages in this thread</div><ul class="threadlist"><li class="root"><a href="/lkml/2005/12/31/105">First message in thread</a></li><li><a href="/lkml/2005/12/31/105">"Jason Dravet"</a><ul><li class="origin"><a href="/lkml/2005/12/31/113">Jan Engelhardt</a><ul><li><a href="/lkml/2005/12/31/113">"Jason Dravet"</a><ul><li><a href="/lkml/2005/12/31/133">Jan Engelhardt</a></li></ul></li><li><a href="/lkml/2005/12/31/125">"Jason Dravet"</a></li></ul></li><li><a href="/lkml/2005/12/31/112">Jiri Slaby</a><ul><li><a href="/lkml/2005/12/31/114">"Jason Dravet"</a></li></ul></li></ul></li></ul></td><td width="32" rowspan="2" class="c" valign="top"><img src="/images/icornerl.gif" width="32" height="32" alt="/" /></td><td class="c" rowspan="2" valign="top" style="padding-top: 1em"><table><tr><td><table><tr><td class="lp">Date</td><td class="rp" itemprop="datePublished">Sat, 31 Dec 2005 18:38:42 +0100 (MET)</td></tr><tr><td class="lp">From</td><td class="rp" itemprop="author">Jan Engelhardt &lt;&gt;</td></tr><tr><td class="lp">Subject</td><td class="rp" itemprop="name">Re: RFC: add udev support to parport_pc</td></tr></table></td><td></td></tr></table><pre itemprop="articleBody"><br />&gt; + parallel_class = class_create(THIS_MODULE, "lp");<br />&gt; + if (p-&gt;base == 888) /* 888 is dec for 378h */<br /><br />I would prefer to actually see == 0x378 in the code, because the <br />hexademical number is what you see everywhere else, such as the BIOS POST <br />and /proc/ioports. This also applies to 0x278 and 0x3BC below.<br /><br />&gt; + {<br />&gt; + class_device_create(parallel_class, NULL, MKDEV(6, 0), NULL,<br />&gt; "lp0");<br />&gt; + class_device_create(parallel_class, NULL, MKDEV(99, 0), NULL,<br />&gt; "parport0");<br />&gt; + }<br /><br />Background info before: Because I burnt my on-board LPT port (applying too <br />much volts or milliamps), I bought a dual-slot PCI add-in card. This card <br />provides "parport1" and "parport2" at ports at 0xC800 and 0xC00 <br />(/proc/ioports).<br /><br />There are a number of problems in your code:<br /><br />1- testing just for 0x378/0x278/0x3BC is not enough<br /><br />2- parport0 could be 0xC800 (address may vary) if you do not<br /> have any onboard LPT ports.<br /> 2=&gt; that is why I think you should not reserver "lp0"/"parport0"<br /> for 0x378.<br /><br />All this applies to the other chunks too of course...:<br /><br />&gt; + if (p-&gt;base == 632) /* 632 is dec for 278h */<br />&gt; + {<br />&gt; + class_device_create(parallel_class, NULL, MKDEV(6, 1), NULL,<br />&gt; "lp1");<br />&gt; + class_device_create(parallel_class, NULL, MKDEV(99, 1), NULL,<br />&gt; "parport1");<br />&gt; + }<br />&gt; +<br />&gt; + if (p-&gt;base == 956) /* 956 is dec for 3BCh */<br />&gt; + {<br />&gt; + class_device_create(parallel_class, NULL, MKDEV(6, 2), NULL,<br />&gt; "lp2");<br />&gt; + class_device_create(parallel_class, NULL, MKDEV(99, 2), NULL,<br />&gt; "parport2");<br />&gt; + }<br />&gt; +<br /><br /><br />&gt; + class_device_destroy(parallel_class, MKDEV(99, 2));<br />&gt; + class_device_destroy(parallel_class, MKDEV(6, 2));<br />&gt; + class_device_destroy(parallel_class, MKDEV(99, 1));<br />&gt; + class_device_destroy(parallel_class, MKDEV(6, 1));<br />&gt; + class_device_destroy(parallel_class, MKDEV(99, 0));<br />&gt; + class_device_destroy(parallel_class, MKDEV(6, 0));<br />&gt; +<br /><br /><br />Jan Engelhardt<br />-- <br />| Alphagate Systems, <a href="http://alphagate.hopto.org/">http://alphagate.hopto.org/</a><br />| jengelh's site, <a href="http://jengelh.hopto.org/">http://jengelh.hopto.org/</a><br />-<br />To unsubscribe from this list: send the line "unsubscribe linux-kernel" in<br />the body of a message to majordomo&#64;vger.kernel.org<br />More majordomo info at <a href="http://vger.kernel.org/majordomo-info.html">http://vger.kernel.org/majordomo-info.html</a><br />Please read the FAQ at <a href="http://www.tux.org/lkml/">http://www.tux.org/lkml/</a><br /><br /></pre></td><td width="32" rowspan="2" class="c" valign="top"><img src="/images/icornerr.gif" width="32" height="32" alt="\" /></td></tr><tr><td align="right" valign="bottom"> 聽 </td></tr><tr><td align="right" valign="bottom">聽</td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerl.gif" width="32" height="32" alt="\" /></td><td class="c">聽</td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerr.gif" width="32" height="32" alt="/" /></td></tr><tr><td align="right" valign="top" colspan="2"> 聽 </td><td class="lm">Last update: 2005-12-31 18:43 聽聽 [from the cache]<br />漏2003-2020 <a href="http://blog.jasper.es/"><span itemprop="editor">Jasper Spaans</span></a>|hosted at <a href="https://www.digitalocean.com/?refcode=9a8e99d24cf9">Digital Ocean</a> and my Meterkast|<a href="http://blog.jasper.es/categories.html#lkml-ref">Read the blog</a></td><td>聽</td></tr></table><script language="javascript" src="/js/styleswitcher.js" type="text/javascript"></script></body></html>

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