<?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>spi_busnum_to_master</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="ch09.html" title="Chapter 9. Serial Peripheral Interface (SPI)" /><link rel="prev" href="re748.html" title="spi_unregister_master" /><link rel="next" href="re750.html" title="spi_setup" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>spi_busnum_to_master</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re748.html">Prev</a> </td><th width="60%" align="center">Chapter 9. Serial Peripheral Interface (SPI)</th><td width="20%" align="right"> <a accesskey="n" href="re750.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="spi_busnum_to_master"><a id="API-spi-busnum-to-master"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>spi_busnum_to_master — look up master associated with bus_num </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">struct spi_master * <b class="fsfunc">spi_busnum_to_master </b>(</code></td><td>u16 <var class="pdparam">bus_num</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2707348"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>bus_num</code></em></span></dt><dd><p> the master's bus number </p></dd></dl></div></div><div class="refsect1" title="Context"><a id="id2707375"></a><h2>Context</h2><p> can sleep </p></div><div class="refsect1" title="Description"><a id="id2707385"></a><h2>Description</h2><p> This call may be used with devices that are registered after arch init time. It returns a refcounted pointer to the relevant spi_master (which the caller must release), or NULL if there is no such master registered. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re748.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch09.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re750.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>spi_unregister_master</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>spi_setup</span></td></tr></table></div></body></html>