1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>i2c_smbus_xfer</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-i2c-smbus-write-block-data.html" title="i2c_smbus_write_block_data"><link rel="next" href="hsi.html" title="Chapter&#160;11.&#160;High Speed Synchronous Serial Interface (HSI)"></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_smbus_xfer</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-i2c-smbus-write-block-data.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="hsi.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-i2c-smbus-xfer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>i2c_smbus_xfer &#8212; 
2     execute SMBus protocol operations
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">s32 <b class="fsfunc">i2c_smbus_xfer </b>(</code></td><td>struct i2c_adapter * <var class="pdparam">adapter</var>, </td></tr><tr><td>&#160;</td><td>u16 <var class="pdparam">addr</var>, </td></tr><tr><td>&#160;</td><td>unsigned short <var class="pdparam">flags</var>, </td></tr><tr><td>&#160;</td><td>char <var class="pdparam">read_write</var>, </td></tr><tr><td>&#160;</td><td>u8 <var class="pdparam">command</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">protocol</var>, </td></tr><tr><td>&#160;</td><td>union i2c_smbus_data * <var class="pdparam">data</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1115560324"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>adapter</code></em></span></dt><dd><p>
4     Handle to I2C bus
5    </p></dd><dt><span class="term"><em class="parameter"><code>addr</code></em></span></dt><dd><p>
6     Address of SMBus slave on that bus
7    </p></dd><dt><span class="term"><em class="parameter"><code>flags</code></em></span></dt><dd><p>
8     I2C_CLIENT_* flags (usually zero or I2C_CLIENT_PEC)
9    </p></dd><dt><span class="term"><em class="parameter"><code>read_write</code></em></span></dt><dd><p>
10     I2C_SMBUS_READ or I2C_SMBUS_WRITE
11    </p></dd><dt><span class="term"><em class="parameter"><code>command</code></em></span></dt><dd><p>
12     Byte interpreted by slave, for protocols which use such bytes
13    </p></dd><dt><span class="term"><em class="parameter"><code>protocol</code></em></span></dt><dd><p>
14     SMBus protocol operation to execute, such as I2C_SMBUS_PROC_CALL
15    </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
16     Data to be read or written
17    </p></dd></dl></div></div><div class="refsect1"><a name="idp1115568236"></a><h2>Description</h2><p>
18   This executes an SMBus protocol operation, and returns a negative
19   errno code else zero on success.
20</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-i2c-smbus-write-block-data.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="i2c.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="hsi.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">i2c_smbus_write_block_data</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;Chapter&#160;11.&#160;High Speed Synchronous Serial Interface (HSI)</td></tr></table></div></body></html>
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