<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>usb_root_hub_lost_power</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux-USB Host Side API" /><link rel="up" href="ch05.html" title="Chapter 5. USB Core APIs" /><link rel="prev" href="re107.html" title="usb_set_device_state" /><link rel="next" href="re109.html" title="usb_reset_device" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_root_hub_lost_power</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re107.html">Prev</a> </td><th width="60%" align="center">Chapter 5. USB Core APIs</th><td width="20%" align="right"> <a accesskey="n" href="re109.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_root_hub_lost_power"><a id="API-usb-root-hub-lost-power"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_root_hub_lost_power —
called by HCD if the root hub lost Vbus power
</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">void <b class="fsfunc">usb_root_hub_lost_power </b>(</code></td><td>struct usb_device * <var class="pdparam">rhdev</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3118425"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>rhdev</code></em></span></dt><dd><p>
struct usb_device for the root hub
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3118452"></a><h2>Description</h2><p>
The USB host controller driver calls this function when its root hub
is resumed and Vbus power has been interrupted or the controller
has been reset. The routine marks <em class="parameter"><code>rhdev</code></em> as having lost power.
When the hub driver is resumed it will take notice and carry out
power-session recovery for all the <span class="quote">“<span class="quote">USB-PERSIST</span>”</span>-enabled child devices;
the others will be disconnected.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re107.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch05.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re109.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>usb_set_device_state</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>usb_reset_device</span></td></tr></table></div></body></html>
