1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>i2c_register_board_info</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="i2c.html" title="Chapter&#160;10.&#160;I2C and SMBus Subsystem"><link rel="prev" href="API-module-i2c-driver.html" title="module_i2c_driver"><link rel="next" href="API-i2c-verify-client.html" title="i2c_verify_client"></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">i2c_register_board_info</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-module-i2c-driver.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;10.&#160;I<sup>2</sup>C and SMBus Subsystem</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-i2c-verify-client.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-i2c-register-board-info"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>i2c_register_board_info &#8212; 
2  statically declare I2C devices
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">i2c_register_board_info </b>(</code></td><td>int <var class="pdparam">busnum</var>, </td></tr><tr><td>&#160;</td><td>struct i2c_board_info const * <var class="pdparam">info</var>, </td></tr><tr><td>&#160;</td><td>unsigned <var class="pdparam">len</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1115320460"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>busnum</code></em></span></dt><dd><p>
4     identifies the bus to which these devices belong
5    </p></dd><dt><span class="term"><em class="parameter"><code>info</code></em></span></dt><dd><p>
6     vector of i2c device descriptors
7    </p></dd><dt><span class="term"><em class="parameter"><code>len</code></em></span></dt><dd><p>
8     how many descriptors in the vector; may be zero to reserve
9     the specified bus number.
10    </p></dd></dl></div></div><div class="refsect1"><a name="idp1115324212"></a><h2>Description</h2><p>
11   Systems using the Linux I2C driver stack can declare tables of board info
12   while they initialize.  This should be done in board-specific init code
13   near <code class="function">arch_initcall</code> time, or equivalent, before any I2C adapter driver is
14   registered.  For example, mainboard init code could define several devices,
15   as could the init code for each daughtercard in a board stack.
16   </p><p>
17
18   The I2C devices will be created later, after the adapter for the relevant
19   bus has been registered.  After that moment, standard driver model tools
20   are used to bind <span class="quote">&#8220;<span class="quote">new style</span>&#8221;</span> I2C drivers to the devices.  The bus number
21   for any device declared using this routine is not available for dynamic
22   allocation.
23   </p><p>
24
25   The board info passed can safely be __initdata, but be careful of embedded
26   pointers (for platform_data, functions, etc) since that won't be copied.
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