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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>pci_set_power_state</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch09s05.html" title="PCI Support Library" /><link rel="prev" href="re329.html" title="__pci_complete_power_transition" /><link rel="next" href="re331.html" title="pci_choose_state" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>pci_set_power_state</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re329.html">Prev</a> </td><th width="60%" align="center">PCI Support Library</th><td width="20%" align="right"> <a accesskey="n" href="re331.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="pci_set_power_state"><a id="API-pci-set-power-state"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pci_set_power_state —
Set the power state of a PCI device
</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">pci_set_power_state </b>(</code></td><td>struct pci_dev * <var class="pdparam">dev</var>, </td></tr><tr><td> </td><td>pci_power_t <var class="pdparam">state</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2669456"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
PCI device to handle.
</p></dd><dt><span class="term"><em class="parameter"><code>state</code></em></span></dt><dd><p>
PCI power state (D0, D1, D2, D3hot) to put the device into.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2669501"></a><h2>Description</h2><p>
Transition a device to a new power state, using the platform firmware and/or
the device's PCI PM registers.
</p></div><div class="refsect1" title="RETURN VALUE"><a id="id2669513"></a><h2>RETURN VALUE</h2><p>
-EINVAL if the requested state is invalid.
-EIO if device does not support PCI PM or its PM capabilities register has a
wrong version, or device doesn't support the requested state.
0 if device already is in the requested state.
0 if device's power state has been successfully changed.
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