1<html><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 V1.78.1"><link rel="home" href="index.html" title="USB Gadget API for Linux"><link rel="up" href="core.html" title="Core Objects and Methods"><link rel="prev" href="API-usb-gadget-connect.html" title="usb_gadget_connect"><link rel="next" href="API-struct-usb-gadget-driver.html" title="struct usb_gadget_driver"></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_gadget_disconnect</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-gadget-connect.html">Prev</a>&#160;</td><th width="60%" align="center">Core Objects and Methods</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-struct-usb-gadget-driver.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-gadget-disconnect"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_gadget_disconnect &#8212; 
2     software-controlled disconnect from USB host
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">usb_gadget_disconnect </b>(</code></td><td>struct usb_gadget * <var class="pdparam">gadget</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124179660"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>gadget</code></em></span></dt><dd><p>
4     the peripheral being disconnected
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124181244"></a><h2>Description</h2><p>
6   Disables the D+ (or potentially D-) pullup, which the host may see
7   as a disconnect (when a VBUS session is active).  Not all systems
8   support software pullup controls.
9   </p><p>
10
11   This routine may be used during the gadget driver <code class="function">bind</code> call to prevent
12   the peripheral from ever being visible to the USB host, unless later
13   <code class="function">usb_gadget_connect</code> is called.  For example, user mode components may
14   need to be activated before the system can talk to hosts.
15   </p><p>
16
17   Returns zero on success, else negative errno.
18</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-usb-gadget-connect.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="core.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-struct-usb-gadget-driver.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">usb_gadget_connect</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">struct usb_gadget_driver</span></td></tr></table></div></body></html>
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