1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>snd_dmaengine_pcm_prepare_slave_config</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="ch07s03.html" title="ASoC DMA Engine API"><link rel="prev" href="ch07s03.html" title="ASoC DMA Engine API"><link rel="next" href="API-snd-dmaengine-pcm-register.html" title="snd_dmaengine_pcm_register"></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_dmaengine_pcm_prepare_slave_config</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch07s03.html">Prev</a>&#160;</td><th width="60%" align="center">ASoC DMA Engine API</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-snd-dmaengine-pcm-register.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-snd-dmaengine-pcm-prepare-slave-config"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_dmaengine_pcm_prepare_slave_config &#8212; 
2  Generic prepare_slave_config callback
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_dmaengine_pcm_prepare_slave_config </b>(</code></td><td>struct snd_pcm_substream * <var class="pdparam">substream</var>, </td></tr><tr><td>&#160;</td><td>struct snd_pcm_hw_params * <var class="pdparam">params</var>, </td></tr><tr><td>&#160;</td><td>struct dma_slave_config * <var class="pdparam">slave_config</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1095997092"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>substream</code></em></span></dt><dd><p>
4     PCM substream
5    </p></dd><dt><span class="term"><em class="parameter"><code>params</code></em></span></dt><dd><p>
6     hw_params
7    </p></dd><dt><span class="term"><em class="parameter"><code>slave_config</code></em></span></dt><dd><p>
8     DMA slave config to prepare
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1096000756"></a><h2>Description</h2><p>
10   This function can be used as a generic prepare_slave_config callback for
11   platforms which make use of the snd_dmaengine_dai_dma_data struct for their
12   DAI DMA data. Internally the function will first call
13   snd_hwparams_to_dma_slave_config to fill in the slave config based on the
14   hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
15   remaining fields based on the DAI DMA data.
16</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch07s03.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch07s03.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-snd-dmaengine-pcm-register.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ASoC DMA Engine API&#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">snd_dmaengine_pcm_register</span></td></tr></table></div></body></html>
17