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<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- CVSID: $Id: dbus-interface.xml 1820 2007-01-14 23:24:00Z rhughes $ -->
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<chapter id="dbus-interface">
<title>DBUS Interface</title>
<para>
This API is currently unstable and is likely to change in the future.
</para>
<sect1 id="pm-intro">
<title>Introduction</title>
<para>
Open Hardware Manager exposes a DBUS API for programs to obtain information about
the power state and to change it if required.
</para>
<para>
The following constants are used to uniquely refer to the session-wide
Open Hardware Manager object when making DBUS method calls:
</para>
<informaltable>
<tgroup cols="2">
<tbody>
<row>
<entry>DBUS Service:</entry>
<entry><literal>org.freedesktop.ohm</literal></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect1>
<sect1 id="pm-manager">
<title>Manager functionality</title>
<para>
The manager is the core of <literal>ohmd</literal> and processes all
core functionality such as loading plugins.
</para>
<informaltable>
<tgroup cols="2">
<tbody>
<row>
<entry>DBUS Object Path:</entry>
<entry><literal>/org/freedesktop/ohm/Manager</literal></entry>
</row>
<row>
<entry>DBUS Interface:</entry>
<entry><literal>org.freedesktop.ohm.Manager</literal></entry>
</row>
</tbody>
</tgroup>
</informaltable>
<sect2 id="pm-manager-keys">
<title>
<literal>Exported keys</literal>
</title>
<para>
Keys exported by the manager:
</para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>Key</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><literal>manager.version.major</literal></entry>
<entry>The major version number</entry>
</row>
<row>
<entry><literal>manager.version.minor</literal></entry>
<entry>The minor version number</entry>
</row>
<row>
<entry><literal>manager.version.patch</literal></entry>
<entry>The patch version number</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect2>
<sect2 id="pm-manager-GetVersion">
<title>
<literal>GetVersion()</literal>
</title>
<para>
Gets the version of the <literal>ohmd</literal> daemon.
</para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>Direction</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>out</entry>
<entry>string</entry>
<entry>The version, e.g. 0.2.3</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect2>
<sect2 id="pm-manager-GetPlugins">
<title>
<literal>GetPlugins()</literal>
</title>
<para>
Gets the plugings currently loaded in the daemon.
</para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>Direction</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>out</entry>
<entry>string array</entry>
<entry>A list of plugins, for instance,
<literal>backlight</literal>, <literal>heat-pol</literal></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect2>
</sect1>
<sect1 id="pm-keystore">
<title>Keystore functionality</title>
<para>
The keystore is the configuration plugin and processes all
preferences functionality such as the getting and setting of keys.
Session software can attempt to redefine any keys for the current user
but these may not be marked override and the operation may fail.
</para>
<informaltable>
<tgroup cols="2">
<tbody>
<row>
<entry>DBUS Object Path:</entry>
<entry><literal>/org/freedesktop/ohm/Keystore</literal></entry>
</row>
<row>
<entry>DBUS Interface:</entry>
<entry><literal>org.freedesktop.ohm.Keystore</literal></entry>
</row>
</tbody>
</tgroup>
</informaltable>
<sect2 id="pm-keystore-GetKey">
<title>
<literal>GetKey()</literal>
</title>
<para>
Gets a 32 bit signed integer value.
An error is returned if the key does not exist.
</para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>Direction</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>in</entry>
<entry>string</entry>
<entry>the key name, e.g. <literal>ac.state</literal></entry>
</row>
<row>
<entry>out</entry>
<entry>integer</entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect2>
<sect2 id="pm-keystore-SetKey">
<title>
<literal>SetKey()</literal>
</title>
<para>
Sets a 32 bit signed integer value.
An error is returned if the key does not exist.
The DBUS interface cannot be used to create keys for security.
</para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>Direction</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>in</entry>
<entry>string</entry>
<entry>the key name, e.g. <literal>ac.state</literal></entry>
</row>
<row>
<entry>in</entry>
<entry>integer</entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect2>
<sect2 id="pm-keystore-AddNotifyKey">
<title>
<literal>AddNotifyKey()</literal>
</title>
<para>
Tells OHM that an application or plugin wants notification of this key
change.
This prevents uninteresting keys from being changed with no action
causing unnecessary context switches and processor usage.
<literal>KeyChanged</literal> signals will not be sent unless at least
one application has requested notifications.
</para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>Direction</entry>
<entry>Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>in</entry>
<entry>string</entry>
<entry>the key name, e.g. <literal>ac.state</literal></entry>
</row>
<row>
<entry>in</entry>
<entry>integer</entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect2>
</sect1>
</chapter>
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