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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_smbus_xfer</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="re788.html" title="i2c_smbus_write_block_data" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>i2c_smbus_xfer</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re788.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"> </td></tr></table><hr /></div><div class="refentry" title="i2c_smbus_xfer"><a id="API-i2c-smbus-xfer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>i2c_smbus_xfer —
execute SMBus protocol operations
</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">s32 <b class="fsfunc">i2c_smbus_xfer </b>(</code></td><td>struct i2c_adapter * <var class="pdparam">adapter</var>, </td></tr><tr><td> </td><td>u16 <var class="pdparam">addr</var>, </td></tr><tr><td> </td><td>unsigned short <var class="pdparam">flags</var>, </td></tr><tr><td> </td><td>char <var class="pdparam">read_write</var>, </td></tr><tr><td> </td><td>u8 <var class="pdparam">command</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">protocol</var>, </td></tr><tr><td> </td><td>union i2c_smbus_data * <var class="pdparam">data</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3144519"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>adapter</code></em></span></dt><dd><p>
Handle to I2C bus
</p></dd><dt><span class="term"><em class="parameter"><code>addr</code></em></span></dt><dd><p>
Address of SMBus slave on that bus
</p></dd><dt><span class="term"><em class="parameter"><code>flags</code></em></span></dt><dd><p>
I2C_CLIENT_* flags (usually zero or I2C_CLIENT_PEC)
</p></dd><dt><span class="term"><em class="parameter"><code>read_write</code></em></span></dt><dd><p>
I2C_SMBUS_READ or I2C_SMBUS_WRITE
</p></dd><dt><span class="term"><em class="parameter"><code>command</code></em></span></dt><dd><p>
Byte interpreted by slave, for protocols which use such bytes
</p></dd><dt><span class="term"><em class="parameter"><code>protocol</code></em></span></dt><dd><p>
SMBus protocol operation to execute, such as I2C_SMBUS_PROC_CALL
</p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
Data to be read or written
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3144651"></a><h2>Description</h2><p>
This executes an SMBus protocol operation, and returns a negative
errno code else zero on success.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re788.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch10.html">Up</a></td><td width="40%" align="right"> </td></tr><tr><td width="40%" align="left" valign="top"><span>i2c_smbus_write_block_data</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></body></html>
