<?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>device_find_child</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch02.html#id3048322" title="Device Drivers Base" /><link rel="prev" href="re191.html" title="device_for_each_child" /><link rel="next" href="re193.html" title="__root_device_register" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>device_find_child</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re191.html">Prev</a> </td><th width="60%" align="center">Device Drivers Base</th><td width="20%" align="right"> <a accesskey="n" href="re193.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="device_find_child"><a id="API-device-find-child"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>device_find_child —
device iterator for locating a particular device.
</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">struct device * <b class="fsfunc">device_find_child </b>(</code></td><td>struct device * <var class="pdparam">parent</var>, </td></tr><tr><td> </td><td>void * <var class="pdparam">data</var>, </td></tr><tr><td> </td><td>int (*<var class="pdparam">match</var>)
<code>(</code>struct device *dev, void *data<code>)</code><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3052144"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>parent</code></em></span></dt><dd><p>
parent struct device
</p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
Data to pass to match function
</p></dd><dt><span class="term"><em class="parameter"><code>match</code></em></span></dt><dd><p>
Callback function to check device
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3052206"></a><h2>Description</h2><p>
This is similar to the <code class="function">device_for_each_child</code> function above, but it
returns a reference to a device that is 'found' for later use, as
determined by the <em class="parameter"><code>match</code></em> callback.
</p><p>
The callback should return 0 if the device doesn't match and non-zero
if it does. If the callback returns non-zero and a reference to the
current device can be obtained, this function will return to the caller
and not iterate over any more devices.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re191.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html#id3048322">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re193.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>device_for_each_child</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>__root_device_register</span></td></tr></table></div></body></html>
