1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>PCM DMA Engine API</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="ch02.html" title="Chapter 2. PCM API"><link rel="prev" href="API-snd-pcm-lib-get-vmalloc-page.html" title="snd_pcm_lib_get_vmalloc_page"><link rel="next" href="API-snd-hwparams-to-dma-slave-config.html" title="snd_hwparams_to_dma_slave_config"></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">PCM DMA Engine API</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-pcm-lib-get-vmalloc-page.html">Prev</a> </td><th width="60%" align="center">Chapter 2. PCM API</th><td width="20%" align="right"> <a accesskey="n" href="API-snd-hwparams-to-dma-slave-config.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp1094358116"></a>PCM DMA Engine API</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-snd-hwparams-to-dma-slave-config.html"><span class="phrase">snd_hwparams_to_dma_slave_config</span></a></span><span class="refpurpose"> — 2 Convert hw_params to dma_slave_config 3 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-set-config-from-dai-data.html"><span class="phrase">snd_dmaengine_pcm_set_config_from_dai_data</span></a></span><span class="refpurpose"> — 4 Initializes a dma slave config using DAI DMA data. 5 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-trigger.html"><span class="phrase">snd_dmaengine_pcm_trigger</span></a></span><span class="refpurpose"> — 6 dmaengine based PCM trigger implementation 7 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-pointer-no-residue.html"><span class="phrase">snd_dmaengine_pcm_pointer_no_residue</span></a></span><span class="refpurpose"> — 8 dmaengine based PCM pointer implementation 9 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-pointer.html"><span class="phrase">snd_dmaengine_pcm_pointer</span></a></span><span class="refpurpose"> — 10 dmaengine based PCM pointer implementation 11 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-request-channel.html"><span class="phrase">snd_dmaengine_pcm_request_channel</span></a></span><span class="refpurpose"> — 12 Request channel for the dmaengine PCM 13 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-open.html"><span class="phrase">snd_dmaengine_pcm_open</span></a></span><span class="refpurpose"> — 14 Open a dmaengine based PCM substream 15 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-open-request-chan.html"><span class="phrase">snd_dmaengine_pcm_open_request_chan</span></a></span><span class="refpurpose"> — 16 Open a dmaengine based PCM substream and request channel 17 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-close.html"><span class="phrase">snd_dmaengine_pcm_close</span></a></span><span class="refpurpose"> — 18 Close a dmaengine based PCM substream 19 </span></dt><dt><span class="refentrytitle"><a href="API-snd-dmaengine-pcm-close-release-chan.html"><span class="phrase">snd_dmaengine_pcm_close_release_chan</span></a></span><span class="refpurpose"> — 20 Close a dmaengine based PCM substream and release channel 21 </span></dt><dt><span class="refentrytitle"><a href="API-snd-pcm-substream-to-dma-direction.html"><span class="phrase">snd_pcm_substream_to_dma_direction</span></a></span><span class="refpurpose"> — 22 Get dma_transfer_direction for a PCM substream 23 </span></dt><dt><span class="refentrytitle"><a href="API-struct-snd-dmaengine-dai-dma-data.html"><span class="phrase">struct snd_dmaengine_dai_dma_data</span></a></span><span class="refpurpose"> — 24 DAI DMA configuration data 25 </span></dt><dt><span class="refentrytitle"><a href="API-struct-snd-dmaengine-pcm-config.html"><span class="phrase">struct snd_dmaengine_pcm_config</span></a></span><span class="refpurpose"> — 26 Configuration data for dmaengine based PCM 27 </span></dt></dl></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-snd-pcm-lib-get-vmalloc-page.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-snd-hwparams-to-dma-slave-config.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">snd_pcm_lib_get_vmalloc_page</span> </td><td width="20%" align="center"><a 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