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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>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="id2867780"></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="id2867872"></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="id2867895"></a><h2>LOCKING</h2><p>
Inherited from calling layer (may sleep).
</p></div><div class="refsect1" title="RETURNS"><a id="id2867906"></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>
