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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>__root_device_register</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#id2617423" title="Device Drivers Base" /><link rel="prev" href="re190.html" title="device_find_child" /><link rel="next" href="re192.html" title="root_device_unregister" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>__root_device_register</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re190.html">Prev</a> </td><th width="60%" align="center">Device Drivers Base</th><td width="20%" align="right"> <a accesskey="n" href="re192.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="__root_device_register"><a id="API---root-device-register"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>__root_device_register —
allocate and register a root 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">__root_device_register </b>(</code></td><td>const char * <var class="pdparam">name</var>, </td></tr><tr><td> </td><td>struct module * <var class="pdparam">owner</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2621421"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>name</code></em></span></dt><dd><p>
root device name
</p></dd><dt><span class="term"><em class="parameter"><code>owner</code></em></span></dt><dd><p>
owner module of the root device, usually THIS_MODULE
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2621466"></a><h2>Description</h2><p>
This function allocates a root device and registers it
using <code class="function">device_register</code>. In order to free the returned
device, use <code class="function">root_device_unregister</code>.
</p><p>
Root devices are dummy devices which allow other devices
to be grouped under /sys/devices. Use this function to
allocate a root device and then use it as the parent of
any device which should appear under /sys/devices/{name}
</p><p>
The /sys/devices/{name} directory will also contain a
'module' symlink which points to the <em class="parameter"><code>owner</code></em> directory
in sysfs.
</p></div><div class="refsect1" title="Note"><a id="id2621506"></a><h2>Note</h2><p>
You probably want to use <code class="function">root_device_register</code>.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re190.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html#id2617423">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re192.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>device_find_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_unregister</span></td></tr></table></div></body></html>
