1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>usb_find_alt_setting</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux-USB Host Side API"><link rel="up" href="usbcore.html" title="Chapter&#160;5.&#160;USB Core APIs"><link rel="prev" href="API-usb-autopm-get-interface-no-resume.html" title="usb_autopm_get_interface_no_resume"><link rel="next" href="API-usb-ifnum-to-if.html" title="usb_ifnum_to_if"></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">usb_find_alt_setting</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-autopm-get-interface-no-resume.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;5.&#160;USB Core APIs</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-usb-ifnum-to-if.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-find-alt-setting"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_find_alt_setting &#8212; 
2  Given a configuration, find the alternate setting for the given interface.
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 usb_host_interface * <b class="fsfunc">usb_find_alt_setting </b>(</code></td><td>struct usb_host_config * <var class="pdparam">config</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">iface_num</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">alt_num</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1116456700"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>config</code></em></span></dt><dd><p>
4     the configuration to search (not necessarily the current config).
5    </p></dd><dt><span class="term"><em class="parameter"><code>iface_num</code></em></span></dt><dd><p>
6     interface number to search in
7    </p></dd><dt><span class="term"><em class="parameter"><code>alt_num</code></em></span></dt><dd><p>
8     alternate interface setting number to search for.
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1116460292"></a><h2>Description</h2><p>
10   Search the configuration's interface cache for the given alt setting.
11</p></div><div class="refsect1"><a name="idp1116460948"></a><h2>Return</h2><p>
12   The alternate setting, if found. <code class="constant">NULL</code> otherwise.
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