1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>parport_register_driver</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="parportdev.html" title="Chapter&#160;3.&#160;Parallel Port Devices"><link rel="prev" href="API-parport-set-timeout.html" title="parport_set_timeout"><link rel="next" href="API-parport-unregister-driver.html" title="parport_unregister_driver"></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">parport_register_driver</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-parport-set-timeout.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;3.&#160;Parallel Port Devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-parport-unregister-driver.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-parport-register-driver"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>parport_register_driver &#8212; 
2  register a parallel port device driver
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">parport_register_driver </b>(</code></td><td>struct parport_driver * <var class="pdparam">drv</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1110972460"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>drv</code></em></span></dt><dd><p>
4     structure describing the driver
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1110974068"></a><h2>Description</h2><p>
6   This can be called by a parallel port device driver in order
7   to receive notifications about ports being found in the
8   system, as well as ports no longer available.
9   </p><p>
10
11   The <em class="parameter"><code>drv</code></em> structure is allocated by the caller and must not be
12   deallocated until after calling <code class="function">parport_unregister_driver</code>.
13   </p><p>
14
15   The driver's <code class="function">attach</code> function may block.  The port that
16   <code class="function">attach</code> is given will be valid for the duration of the
17   callback, but if the driver wants to take a copy of the
18   pointer it must call <code class="function">parport_get_port</code> to do so.  Calling
19   <code class="function">parport_register_device</code> on that port will do this for you.
20   </p><p>
21
22   The driver's <code class="function">detach</code> function may block.  The port that
23   <code class="function">detach</code> is given will be valid for the duration of the
24   callback, but if the driver wants to take a copy of the
25   pointer it must call <code class="function">parport_get_port</code> to do so.
26   </p><p>
27
28   Returns 0 on success.  Currently it always succeeds.
29</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-parport-set-timeout.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="parportdev.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-parport-unregister-driver.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">parport_set_timeout</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">parport_unregister_driver</span></td></tr></table></div></body></html>
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