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<!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>i2c_add_numbered_adapter</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 10. I2C and SMBus Subsystem" /><link rel="prev" href="API-i2c-add-adapter.html" title="i2c_add_adapter" /><link rel="next" href="API-i2c-del-adapter.html" title="i2c_del_adapter" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">i2c_add_numbered_adapter</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-i2c-add-adapter.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="API-i2c-del-adapter.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-i2c-add-numbered-adapter"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>i2c_add_numbered_adapter —
declare i2c adapter, use static bus number
</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 <strong class="fsfunc">i2c_add_numbered_adapter </strong>(</code></td><td>struct i2c_adapter * <var class="pdparam">adap</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="idm140404952611936"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>adap</code></em></span></dt><dd><p>
the adapter to register (with adap->nr initialized)
</p></dd></dl></div></div><div class="refsect1"><a id="idm140404952608688"></a><h2>Context</h2><p>
can sleep
</p></div><div class="refsect1"><a id="idm140404952607472"></a><h2>Description</h2><p>
This routine is used to declare an I2C adapter when its bus number
matters. For example, use it for I2C adapters from system-on-chip CPUs,
or otherwise built in to the system's mainboard, and where i2c_board_info
is used to properly configure I2C devices.
</p><p>
If the requested bus number is set to -1, then this function will behave
identically to i2c_add_adapter, and will dynamically assign a bus number.
</p><p>
If no devices have pre-been declared for this bus, then be sure to
register the adapter before any dynamically allocated ones. Otherwise
the required bus ID may not be available.
</p><p>
When this returns zero, the specified adapter became available for
clients using the bus number provided in adap->nr. Also, the table
of I2C devices pre-declared using <code class="function">i2c_register_board_info</code> is scanned,
and the appropriate driver model device nodes are created. Otherwise, a
negative errno value is returned.
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