1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>bus_find_device</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="ch02s02.html" title="Device Drivers Base"><link rel="prev" href="API-bus-for-each-dev.html" title="bus_for_each_dev"><link rel="next" href="API-bus-find-device-by-name.html" title="bus_find_device_by_name"></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">bus_find_device</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-bus-for-each-dev.html">Prev</a>&#160;</td><th width="60%" align="center">Device Drivers Base</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-bus-find-device-by-name.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-bus-find-device"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>bus_find_device &#8212; 
2     device iterator for locating a particular device.
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 device * <b class="fsfunc">bus_find_device </b>(</code></td><td>struct bus_type * <var class="pdparam">bus</var>, </td></tr><tr><td>&#160;</td><td>struct device * <var class="pdparam">start</var>, </td></tr><tr><td>&#160;</td><td>void * <var class="pdparam">data</var>, </td></tr><tr><td>&#160;</td><td>int (*<var class="pdparam">match</var>)
4     <code>(</code>struct device *dev, void *data<code>)</code><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1110019308"></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>
5     bus type
6    </p></dd><dt><span class="term"><em class="parameter"><code>start</code></em></span></dt><dd><p>
7     Device to begin with
8    </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
9     Data to pass to match function
10    </p></dd><dt><span class="term"><em class="parameter"><code>match</code></em></span></dt><dd><p>
11     Callback function to check device
12    </p></dd></dl></div></div><div class="refsect1"><a name="idp1110023988"></a><h2>Description</h2><p>
13   This is similar to the <code class="function">bus_for_each_dev</code> function above, but it
14   returns a reference to a device that is 'found' for later use, as
15   determined by the <em class="parameter"><code>match</code></em> callback.
16   </p><p>
17
18   The callback should return 0 if the device doesn't match and non-zero
19   if it does.  If the callback returns non-zero, this function will
20   return to the caller and not iterate over any more devices.
21</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-bus-for-each-dev.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch02s02.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-bus-find-device-by-name.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">bus_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">bus_find_device_by_name</span></td></tr></table></div></body></html>
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