1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>usb_alloc_dev</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-for-each-dev.html" title="usb_for_each_dev"><link rel="next" href="API-usb-get-dev.html" title="usb_get_dev"></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_alloc_dev</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-for-each-dev.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-get-dev.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-alloc-dev"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_alloc_dev &#8212; 
2     usb device constructor (usbcore-internal)
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_device * <b class="fsfunc">usb_alloc_dev </b>(</code></td><td>struct usb_device * <var class="pdparam">parent</var>, </td></tr><tr><td>&#160;</td><td>struct usb_bus * <var class="pdparam">bus</var>, </td></tr><tr><td>&#160;</td><td>unsigned <var class="pdparam">port1</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1116505388"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>parent</code></em></span></dt><dd><p>
4     hub to which device is connected; null to allocate a root hub
5    </p></dd><dt><span class="term"><em class="parameter"><code>bus</code></em></span></dt><dd><p>
6     bus used to access the device
7    </p></dd><dt><span class="term"><em class="parameter"><code>port1</code></em></span></dt><dd><p>
8     one-based index of port; ignored for root hubs
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1116509012"></a><h2>Context</h2><p>
10   !<code class="function">in_interrupt</code>
11</p></div><div class="refsect1"><a name="idp1116509900"></a><h2>Description</h2><p>
12   Only hub drivers (including virtual root hub drivers for host
13   controllers) should ever call this.
14   </p><p>
15
16   This call may not be used in a non-sleeping context.
17</p></div><div class="refsect1"><a name="idp1116510788"></a><h2>Return</h2><p>
18   On success, a pointer to the allocated usb device. <code class="constant">NULL</code> on
19   failure.
20</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-for-each-dev.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="usbcore.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-usb-get-dev.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">usb_for_each_dev</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">usb_get_dev</span></td></tr></table></div></body></html>
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