1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>snd_ac97_bus</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The ALSA Driver API"><link rel="up" href="ch03s02.html" title="AC97 Codec API"><link rel="prev" href="API-snd-ac97-get-short-name.html" title="snd_ac97_get_short_name"><link rel="next" href="API-snd-ac97-mixer.html" title="snd_ac97_mixer"></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">snd_ac97_bus</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-ac97-get-short-name.html">Prev</a>&#160;</td><th width="60%" align="center">AC97 Codec API</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-snd-ac97-mixer.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-snd-ac97-bus"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_ac97_bus &#8212; 
2     create an AC97 bus component
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">snd_ac97_bus </b>(</code></td><td>struct snd_card * <var class="pdparam">card</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">num</var>, </td></tr><tr><td>&#160;</td><td>struct snd_ac97_bus_ops * <var class="pdparam">ops</var>, </td></tr><tr><td>&#160;</td><td>void * <var class="pdparam">private_data</var>, </td></tr><tr><td>&#160;</td><td>struct snd_ac97_bus ** <var class="pdparam">rbus</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1094705940"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>card</code></em></span></dt><dd><p>
4     the card instance
5    </p></dd><dt><span class="term"><em class="parameter"><code>num</code></em></span></dt><dd><p>
6     the bus number
7    </p></dd><dt><span class="term"><em class="parameter"><code>ops</code></em></span></dt><dd><p>
8     the bus callbacks table
9    </p></dd><dt><span class="term"><em class="parameter"><code>private_data</code></em></span></dt><dd><p>
10     private data pointer for the new instance
11    </p></dd><dt><span class="term"><em class="parameter"><code>rbus</code></em></span></dt><dd><p>
12     the pointer to store the new AC97 bus instance.
13    </p></dd></dl></div></div><div class="refsect1"><a name="idp1094711668"></a><h2>Description</h2><p>
14   Creates an AC97 bus component.  An struct snd_ac97_bus instance is newly
15   allocated and initialized.
16   </p><p>
17
18   The ops table must include valid callbacks (at least read and
19   write).  The other callbacks, wait and reset, are not mandatory.
20   </p><p>
21
22   The clock is set to 48000.  If another clock is needed, set
23   (*rbus)-&gt;clock manually.
24   </p><p>
25
26   The AC97 bus instance is registered as a low-level device, so you don't
27   have to release it manually.
28</p></div><div class="refsect1"><a name="idp1094713188"></a><h2>Return</h2><p>
29   Zero if successful, or a negative error code on failure.
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