1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>mipi_dsi_dcs_read</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux DRM Developer's Guide"><link rel="up" href="ch02s05.html#idp1126139892" title="MIPI DSI Helper Functions Reference"><link rel="prev" href="API-mipi-dsi-dcs-write.html" title="mipi_dsi_dcs_write"><link rel="next" href="API-mipi-dsi-dcs-nop.html" title="mipi_dsi_dcs_nop"></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">mipi_dsi_dcs_read</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-mipi-dsi-dcs-write.html">Prev</a>&#160;</td><th width="60%" align="center">MIPI DSI Helper Functions Reference</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-mipi-dsi-dcs-nop.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-mipi-dsi-dcs-read"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>mipi_dsi_dcs_read &#8212; 
2     send DCS read request command
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">ssize_t <b class="fsfunc">mipi_dsi_dcs_read </b>(</code></td><td>struct mipi_dsi_device * <var class="pdparam">dsi</var>, </td></tr><tr><td>&#160;</td><td>u8 <var class="pdparam">cmd</var>, </td></tr><tr><td>&#160;</td><td>void * <var class="pdparam">data</var>, </td></tr><tr><td>&#160;</td><td>size_t <var class="pdparam">len</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1126292564"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dsi</code></em></span></dt><dd><p>
4     DSI peripheral device
5    </p></dd><dt><span class="term"><em class="parameter"><code>cmd</code></em></span></dt><dd><p>
6     DCS command
7    </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
8     buffer in which to receive data
9    </p></dd><dt><span class="term"><em class="parameter"><code>len</code></em></span></dt><dd><p>
10     size of receive buffer
11    </p></dd></dl></div></div><div class="refsect1"><a name="idp1126297204"></a><h2>Return</h2><p>
12   The number of bytes read or a negative error code on failure.
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