<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>usb_add_config</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="USB Gadget API for Linux" /><link rel="up" href="ch03s05.html" title="Composite Device Framework" /><link rel="prev" href="re60.html" title="usb_interface_id" /><link rel="next" href="re62.html" title="usb_string_id" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_add_config</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re60.html">Prev</a> </td><th width="60%" align="center">Composite Device Framework</th><td width="20%" align="right"> <a accesskey="n" href="re62.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_add_config"><a id="API-usb-add-config"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_add_config — add a configuration to a device. </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">int <b class="fsfunc">usb_add_config </b>(</code></td><td>struct usb_composite_dev * <var class="pdparam">cdev</var>, </td></tr><tr><td> </td><td>struct usb_configuration * <var class="pdparam">config</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2999591"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>cdev</code></em></span></dt><dd><p> wraps the USB gadget </p></dd><dt><span class="term"><em class="parameter"><code>config</code></em></span></dt><dd><p> the configuration, with bConfigurationValue assigned </p></dd></dl></div></div><div class="refsect1" title="Context"><a id="id2999635"></a><h2>Context</h2><p> single threaded during gadget setup </p></div><div class="refsect1" title="Description"><a id="id2999645"></a><h2>Description</h2><p> One of the main tasks of a composite driver's <code class="function">bind</code> routine is to add each of the configurations it supports, using this routine. </p><p> This function returns the value of the configuration's <code class="function">bind</code>, which is zero for success else a negative errno value. Binding configurations assigns global resources including string IDs, and per-configuration resources such as interface IDs and endpoints. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re60.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch03s05.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re62.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>usb_interface_id</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>usb_string_id</span></td></tr></table></div></body></html>