1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>pci_get_class</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="ch09s05.html" title="PCI Support Library"><link rel="prev" href="API-pci-get-device.html" title="pci_get_device"><link rel="next" href="API-pci-dev-present.html" title="pci_dev_present"></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">pci_get_class</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-pci-get-device.html">Prev</a>&#160;</td><th width="60%" align="center">PCI Support Library</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-pci-dev-present.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-pci-get-class"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pci_get_class &#8212; 
2     begin or continue searching for a PCI device by class
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">struct pci_dev * <b class="fsfunc">pci_get_class </b>(</code></td><td>unsigned int <var class="pdparam">class</var>, </td></tr><tr><td>&#160;</td><td>struct pci_dev * <var class="pdparam">from</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1126801220"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>class</code></em></span></dt><dd><p>
4     search for a PCI device with this class designation
5    </p></dd><dt><span class="term"><em class="parameter"><code>from</code></em></span></dt><dd><p>
6     Previous PCI device found in search, or <code class="constant">NULL</code> for new search.
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1126804148"></a><h2>Description</h2><p>
8   Iterates through the list of known PCI devices.  If a PCI device is
9   found with a matching <em class="parameter"><code>class</code></em>, the reference count to the device is
10   incremented and a pointer to its device structure is returned.
11   Otherwise, <code class="constant">NULL</code> is returned.
12   A new search is initiated by passing <code class="constant">NULL</code> as the <em class="parameter"><code>from</code></em> argument.
13   Otherwise if <em class="parameter"><code>from</code></em> is not <code class="constant">NULL</code>, searches continue from next device
14   on the global list.  The reference count for <em class="parameter"><code>from</code></em> is always decremented
15   if it is not <code class="constant">NULL</code>.
16</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-pci-get-device.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch09s05.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-pci-dev-present.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">pci_get_device</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">pci_dev_present</span></td></tr></table></div></body></html>
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