<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>snd_power_wait</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="ch01.html#idp307253644" title="Card Management"><link rel="prev" href="API-snd-card-file-remove.html" title="snd_card_file_remove"><link rel="next" href="ch01s02.html" title="Device Components"></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_power_wait</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-card-file-remove.html">Prev</a> </td><th width="60%" align="center">Card Management</th><td width="20%" align="right"> <a accesskey="n" href="ch01s02.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-snd-power-wait"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_power_wait —
wait until the power-state is changed.
</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_power_wait </b>(</code></td><td>struct snd_card * <var class="pdparam">card</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">power_state</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idp309582284"></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>
soundcard structure
</p></dd><dt><span class="term"><em class="parameter"><code>power_state</code></em></span></dt><dd><p>
expected power state
</p></dd></dl></div></div><div class="refsect1"><a name="idp309584844"></a><h2>Description</h2><p>
Waits until the power-state is changed.
</p></div><div class="refsect1"><a name="idp309585476"></a><h2>Return</h2><p>
Zero if successful, or a negative error code.
</p></div><div class="refsect1"><a name="idp309586108"></a><h2>Note</h2><p>
the power lock must be active before call.
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