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<html xmlns="http://www.w3.org/1999/xhtml"><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 V1.75.2" /><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="re390.html" title="pci_get_device" /><link rel="next" href="re392.html" title="pci_dev_present" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>pci_get_class</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re390.html">Prev</a> </td><th width="60%" align="center">PCI Support Library</th><td width="20%" align="right"> <a accesskey="n" href="re392.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="pci_get_class"><a id="API-pci-get-class"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pci_get_class —
begin or continue searching for a PCI device by class
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><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> </td><td>struct pci_dev * <var class="pdparam">from</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3010386"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>class</code></em></span></dt><dd><p>
search for a PCI device with this class designation
</p></dd><dt><span class="term"><em class="parameter"><code>from</code></em></span></dt><dd><p>
Previous PCI device found in search, or <code class="constant">NULL</code> for new search.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3010435"></a><h2>Description</h2><p>
Iterates through the list of known PCI devices. If a PCI device is
found with a matching <em class="parameter"><code>class</code></em>, the reference count to the device is
incremented and a pointer to its device structure is returned.
Otherwise, <code class="constant">NULL</code> is returned.
A new search is initiated by passing <code class="constant">NULL</code> as the <em class="parameter"><code>from</code></em> argument.
Otherwise if <em class="parameter"><code>from</code></em> is not <code class="constant">NULL</code>, searches continue from next device
on the global list. The reference count for <em class="parameter"><code>from</code></em> is always decremented
if it is not <code class="constant">NULL</code>.
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