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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>usb_function_activate</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="re58.html" title="usb_function_deactivate" /><link rel="next" href="re60.html" title="usb_interface_id" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_function_activate</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re58.html">Prev</a> </td><th width="60%" align="center">Composite Device Framework</th><td width="20%" align="right"> <a accesskey="n" href="re60.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_function_activate"><a id="API-usb-function-activate"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_function_activate —
allow function and gadget enumeration
</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_function_activate </b>(</code></td><td>struct usb_function * <var class="pdparam">function</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2945891"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>function</code></em></span></dt><dd><p>
function on which <code class="function">usb_function_activate</code> was called
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2945921"></a><h2>Description</h2><p>
Reverses effect of <code class="function">usb_function_deactivate</code>. If no more functions
are delaying their activation, the gadget driver will respond to
host enumeration procedures.
</p><p>
Returns zero on success, else negative errno.
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