<?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>parport_register_driver</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="ch03.html" title="Chapter 3. Parallel Port Devices" /><link rel="prev" href="re283.html" title="parport_set_timeout" /><link rel="next" href="re285.html" title="parport_unregister_driver" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>parport_register_driver</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re283.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Parallel Port Devices</th><td width="20%" align="right"> <a accesskey="n" href="re285.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="parport_register_driver"><a id="API-parport-register-driver"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>parport_register_driver — register a parallel port device driver </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">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"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2635336"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>drv</code></em></span></dt><dd><p> structure describing the driver </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2635363"></a><h2>Description</h2><p> This can be called by a parallel port device driver in order to receive notifications about ports being found in the system, as well as ports no longer available. </p><p> The <em class="parameter"><code>drv</code></em> structure is allocated by the caller and must not be deallocated until after calling <code class="function">parport_unregister_driver</code>. </p><p> The driver's <code class="function">attach</code> function may block. The port that <code class="function">attach</code> is given will be valid for the duration of the callback, but if the driver wants to take a copy of the pointer it must call <code class="function">parport_get_port</code> to do so. Calling <code class="function">parport_register_device</code> on that port will do this for you. </p><p> The driver's <code class="function">detach</code> function may block. The port that <code class="function">detach</code> is given will be valid for the duration of the callback, but if the driver wants to take a copy of the pointer it must call <code class="function">parport_get_port</code> to do so. </p><p> Returns 0 on success. Currently it always succeeds. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re283.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re285.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>parport_set_timeout</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>parport_unregister_driver</span></td></tr></table></div></body></html>