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<html xmlns="http://www.w3.org/1999/xhtml"><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 V1.75.2" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch10.html" title="Chapter 10. I2C and SMBus Subsystem" /><link rel="prev" href="re765.html" title="struct i2c_msg" /><link rel="next" href="re767.html" title="i2c_verify_client" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>i2c_register_board_info</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re765.html">Prev</a> </td><th width="60%" align="center">Chapter 10. I<sup>2</sup>C and SMBus Subsystem</th><td width="20%" align="right"> <a accesskey="n" href="re767.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="i2c_register_board_info"><a id="API-i2c-register-board-info"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>i2c_register_board_info —
statically declare I2C devices
</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">int <b class="fsfunc">i2c_register_board_info </b>(</code></td><td>int <var class="pdparam">busnum</var>, </td></tr><tr><td> </td><td>struct i2c_board_info const * <var class="pdparam">info</var>, </td></tr><tr><td> </td><td>unsigned <var class="pdparam">len</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3140862"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>busnum</code></em></span></dt><dd><p>
identifies the bus to which these devices belong
</p></dd><dt><span class="term"><em class="parameter"><code>info</code></em></span></dt><dd><p>
vector of i2c device descriptors
</p></dd><dt><span class="term"><em class="parameter"><code>len</code></em></span></dt><dd><p>
how many descriptors in the vector; may be zero to reserve
the specified bus number.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3140925"></a><h2>Description</h2><p>
Systems using the Linux I2C driver stack can declare tables of board info
while they initialize. This should be done in board-specific init code
near <code class="function">arch_initcall</code> time, or equivalent, before any I2C adapter driver is
registered. For example, mainboard init code could define several devices,
as could the init code for each daughtercard in a board stack.
</p><p>
The I2C devices will be created later, after the adapter for the relevant
bus has been registered. After that moment, standard driver model tools
are used to bind <span class="quote">“<span class="quote">new style</span>”</span> I2C drivers to the devices. The bus number
for any device declared using this routine is not available for dynamic
allocation.
</p><p>
The board info passed can safely be __initdata, but be careful of embedded
pointers (for platform_data, functions, etc) since that won't be copied.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re765.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch10.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re767.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>struct i2c_msg</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>i2c_verify_client</span></td></tr></table></div></body></html>
