<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><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 V1.75.2" /><link rel="home" href="index.html" title="libATA Developer's Guide" /><link rel="up" href="ch04.html" title="Chapter 4. libata Library" /><link rel="prev" href="re55.html" title="ata_host_register" /><link rel="next" href="re57.html" title="ata_host_detach" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>ata_host_activate</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re55.html">Prev</a> </td><th width="60%" align="center">Chapter 4. libata Library</th><td width="20%" align="right"> <a accesskey="n" href="re57.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ata_host_activate"><a id="API-ata-host-activate"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ata_host_activate — start host, request IRQ and register it </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">int <b class="fsfunc">ata_host_activate </b>(</code></td><td>struct ata_host * <var class="pdparam">host</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">irq</var>, </td></tr><tr><td> </td><td>irq_handler_t <var class="pdparam">irq_handler</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">irq_flags</var>, </td></tr><tr><td> </td><td>struct scsi_host_template * <var class="pdparam">sht</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2900685"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>host</code></em></span></dt><dd><p> target ATA host </p></dd><dt><span class="term"><em class="parameter"><code>irq</code></em></span></dt><dd><p> IRQ to request </p></dd><dt><span class="term"><em class="parameter"><code>irq_handler</code></em></span></dt><dd><p> irq_handler used when requesting IRQ </p></dd><dt><span class="term"><em class="parameter"><code>irq_flags</code></em></span></dt><dd><p> irq_flags used when requesting IRQ </p></dd><dt><span class="term"><em class="parameter"><code>sht</code></em></span></dt><dd><p> scsi_host_template to use when registering the host </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2900777"></a><h2>Description</h2><p> After allocating an ATA host and initializing it, most libata LLDs perform three steps to activate the host - start host, request IRQ and register it. This helper takes necessasry arguments and performs the three steps in one go. </p><p> An invalid IRQ skips the IRQ registration and expects the host to have set polling mode on the port. In this case, <em class="parameter"><code>irq_handler</code></em> should be NULL. </p></div><div class="refsect1" title="LOCKING"><a id="id2900800"></a><h2>LOCKING</h2><p> Inherited from calling layer (may sleep). </p></div><div class="refsect1" title="RETURNS"><a id="id2900811"></a><h2>RETURNS</h2><p> 0 on success, -errno otherwise. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re55.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch04.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re57.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>ata_host_register</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>ata_host_detach</span></td></tr></table></div></body></html>