1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>input_mt_init_slots</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="ch08s02.html" title="Multitouch Library"><link rel="prev" href="API-struct-input-mt-pos.html" title="struct input_mt_pos"><link rel="next" href="API-input-mt-destroy-slots.html" title="input_mt_destroy_slots"></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">input_mt_init_slots</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-input-mt-pos.html">Prev</a>&#160;</td><th width="60%" align="center">Multitouch Library</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-input-mt-destroy-slots.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-input-mt-init-slots"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>input_mt_init_slots &#8212; 
2  initialize MT input slots
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">input_mt_init_slots </b>(</code></td><td>struct input_dev * <var class="pdparam">dev</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">num_slots</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">flags</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1114574780"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
4     input device supporting MT events and finger tracking
5    </p></dd><dt><span class="term"><em class="parameter"><code>num_slots</code></em></span></dt><dd><p>
6     number of slots used by the device
7    </p></dd><dt><span class="term"><em class="parameter"><code>flags</code></em></span></dt><dd><p>
8     mt tasks to handle in core
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1114578484"></a><h2>Description</h2><p>
10   This function allocates all necessary memory for MT slot handling
11   in the input device, prepares the ABS_MT_SLOT and
12   ABS_MT_TRACKING_ID events for use and sets up appropriate buffers.
13   Depending on the flags set, it also performs pointer emulation and
14   frame synchronization.
15   </p><p>
16
17   May be called repeatedly. Returns -EINVAL if attempting to
18   reinitialize with a different number of slots.
19</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-input-mt-pos.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch08s02.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-input-mt-destroy-slots.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct input_mt_pos</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;<span class="phrase">input_mt_destroy_slots</span></td></tr></table></div></body></html>
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