1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>input_mt_get_slot_by_key</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-input-mt-assign-slots.html" title="input_mt_assign_slots"><link rel="next" href="ch08s03.html" title="Polled input devices"></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_get_slot_by_key</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-input-mt-assign-slots.html">Prev</a>&#160;</td><th width="60%" align="center">Multitouch Library</th><td width="20%" align="right">&#160;<a accesskey="n" href="ch08s03.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-input-mt-get-slot-by-key"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>input_mt_get_slot_by_key &#8212; 
2     return slot matching key
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_get_slot_by_key </b>(</code></td><td>struct input_dev * <var class="pdparam">dev</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">key</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1114647932"></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 with allocated MT slots
5    </p></dd><dt><span class="term"><em class="parameter"><code>key</code></em></span></dt><dd><p>
6     the key of the sought slot
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1114650564"></a><h2>Description</h2><p>
8   Returns the slot of the given key, if it exists, otherwise
9   set the key on the first unused slot and return.
10   </p><p>
11
12   If no available slot can be found, -1 is returned.
13   Note that for this function to work properly, <code class="function">input_mt_sync_frame</code> has
14   to be called at each frame.
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