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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_gadget_disconnect</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="ch03s03.html" title="Core Objects and Methods" /><link rel="prev" href="re39.html" title="usb_gadget_connect" /><link rel="next" href="re41.html" title="struct usb_gadget_driver" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_gadget_disconnect</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re39.html">Prev</a> </td><th width="60%" align="center">Core Objects and Methods</th><td width="20%" align="right"> <a accesskey="n" href="re41.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_gadget_disconnect"><a id="API-usb-gadget-disconnect"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_gadget_disconnect —
software-controlled disconnect from USB host
</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_gadget_disconnect </b>(</code></td><td>struct usb_gadget * <var class="pdparam">gadget</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2995843"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>gadget</code></em></span></dt><dd><p>
the peripheral being disconnected
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2995869"></a><h2>Description</h2><p>
Disables the D+ (or potentially D-) pullup, which the host may see
as a disconnect (when a VBUS session is active). Not all systems
support software pullup controls.
</p><p>
This routine may be used during the gadget driver <code class="function">bind</code> call to prevent
the peripheral from ever being visible to the USB host, unless later
<code class="function">usb_gadget_connect</code> is called. For example, user mode components may
need to be activated before the system can talk to hosts.
</p><p>
Returns zero on success, else negative errno.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re39.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch03s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re41.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>usb_gadget_connect</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>struct usb_gadget_driver</span></td></tr></table></div></body></html>
