1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>usb_bus_start_enum</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="hcd.html" title="Chapter 6. Host Controller APIs"><link rel="prev" href="API-usb-hcd-resume-root-hub.html" title="usb_hcd_resume_root_hub"><link rel="next" href="API-usb-hcd-irq.html" title="usb_hcd_irq"></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_bus_start_enum</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-hcd-resume-root-hub.html">Prev</a> </td><th width="60%" align="center">Chapter 6. Host Controller APIs</th><td width="20%" align="right"> <a accesskey="n" href="API-usb-hcd-irq.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-bus-start-enum"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_bus_start_enum — 
2     start immediate enumeration (for OTG)
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_bus_start_enum </b>(</code></td><td>struct usb_bus * <var class="pdparam">bus</var>, </td></tr><tr><td> </td><td>unsigned <var class="pdparam">port_num</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="id-1.8.13.5"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>bus</code></em></span></dt><dd><p>
4     the bus (must use hcd framework)
5    </p></dd><dt><span class="term"><em class="parameter"><code>port_num</code></em></span></dt><dd><p>
6     1-based number of port; usually bus-&gt;otg_port
7    </p></dd></dl></div></div><div class="refsect1"><a name="id-1.8.13.6"></a><h2>Context</h2><p>
8   <code class="function">in_interrupt</code>
9</p></div><div class="refsect1"><a name="id-1.8.13.7"></a><h2>Description</h2><p>
10   Starts enumeration, with an immediate reset followed later by
11   hub_wq identifying and possibly configuring the device.
12   This is needed by OTG controller drivers, where it helps meet
13   HNP protocol timing requirements for starting a port reset.
14</p></div><div class="refsect1"><a name="id-1.8.13.8"></a><h2>Return</h2><p>
15   0 if successful.
16</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-hcd-resume-root-hub.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="hcd.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-usb-hcd-irq.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">usb_hcd_resume_root_hub</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">usb_hcd_irq</span></td></tr></table></div></body></html>
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