1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>pci_find_ext_capability</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-find-next-ext-capability.html" title="pci_find_next_ext_capability"><link rel="next" href="API-pci-find-next-ht-capability.html" title="pci_find_next_ht_capability"></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_find_ext_capability</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-pci-find-next-ext-capability.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-find-next-ht-capability.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-pci-find-ext-capability"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pci_find_ext_capability &#8212; 
2     Find an extended capability
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">pci_find_ext_capability </b>(</code></td><td>struct pci_dev * <var class="pdparam">dev</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">cap</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1126101116"></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     PCI device to query
5    </p></dd><dt><span class="term"><em class="parameter"><code>cap</code></em></span></dt><dd><p>
6     capability code
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1126103716"></a><h2>Description</h2><p>
8   Returns the address of the requested extended capability structure
9   within the device's PCI configuration space or 0 if the device does
10   not support it.  Possible values for <em class="parameter"><code>cap</code></em>:
11   </p><p>
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13   <code class="constant">PCI_EXT_CAP_ID_ERR</code>		Advanced Error Reporting
14   <code class="constant">PCI_EXT_CAP_ID_VC</code>		Virtual Channel
15   <code class="constant">PCI_EXT_CAP_ID_DSN</code>		Device Serial Number
16   <code class="constant">PCI_EXT_CAP_ID_PWR</code>		Power Budgeting
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