1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>parport_claim</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="parportdev.html" title="Chapter&#160;3.&#160;Parallel Port Devices"><link rel="prev" href="API-parport-find-base.html" title="parport_find_base"><link rel="next" href="API-parport-claim-or-block.html" title="parport_claim_or_block"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">parport_claim</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-parport-find-base.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;3.&#160;Parallel Port Devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-parport-claim-or-block.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-parport-claim"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>parport_claim &#8212; 
2     claim access to a parallel port device
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">parport_claim </b>(</code></td><td>struct pardevice * <var class="pdparam">dev</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1111093172"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
4     pointer to structure representing a device on the port
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1111094804"></a><h2>Description</h2><p>
6   This function will not block and so can be used from interrupt
7   context.  If <code class="function">parport_claim</code> succeeds in claiming access to
8   the port it returns zero and the port is available to use.  It
9   may fail (returning non-zero) if the port is in use by another
10   driver and that driver is not willing to relinquish control of
11   the port.
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