1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>ata_host_activate</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="libATA Developer's Guide"><link rel="up" href="libataExt.html" title="Chapter&#160;4.&#160;libata Library"><link rel="prev" href="API-ata-host-register.html" title="ata_host_register"><link rel="next" href="API-ata-host-detach.html" title="ata_host_detach"></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">ata_host_activate</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ata-host-register.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;4.&#160;libata Library</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-ata-host-detach.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-ata-host-activate"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ata_host_activate &#8212; 
2     start host, request IRQ and register it
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">ata_host_activate </b>(</code></td><td>struct ata_host * <var class="pdparam">host</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">irq</var>, </td></tr><tr><td>&#160;</td><td>irq_handler_t <var class="pdparam">irq_handler</var>, </td></tr><tr><td>&#160;</td><td>unsigned long <var class="pdparam">irq_flags</var>, </td></tr><tr><td>&#160;</td><td>struct scsi_host_template * <var class="pdparam">sht</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1123881396"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>host</code></em></span></dt><dd><p>
4     target ATA host
5    </p></dd><dt><span class="term"><em class="parameter"><code>irq</code></em></span></dt><dd><p>
6     IRQ to request
7    </p></dd><dt><span class="term"><em class="parameter"><code>irq_handler</code></em></span></dt><dd><p>
8     irq_handler used when requesting IRQ
9    </p></dd><dt><span class="term"><em class="parameter"><code>irq_flags</code></em></span></dt><dd><p>
10     irq_flags used when requesting IRQ
11    </p></dd><dt><span class="term"><em class="parameter"><code>sht</code></em></span></dt><dd><p>
12     scsi_host_template to use when registering the host
13    </p></dd></dl></div></div><div class="refsect1"><a name="idp1123886916"></a><h2>Description</h2><p>
14   After allocating an ATA host and initializing it, most libata
15   LLDs perform three steps to activate the host - start host,
16   request IRQ and register it.  This helper takes necessasry
17   arguments and performs the three steps in one go.
18   </p><p>
19
20   An invalid IRQ skips the IRQ registration and expects the host to
21   have set polling mode on the port. In this case, <em class="parameter"><code>irq_handler</code></em>
22   should be NULL.
23</p></div><div class="refsect1"><a name="idp1123888316"></a><h2>LOCKING</h2><p>
24   Inherited from calling layer (may sleep).
25</p></div><div class="refsect1"><a name="idp1123888948"></a><h2>RETURNS</h2><p>
26   0 on success, -errno otherwise.
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