systemd-sleep: add support for freeze and standby

A new config file /etc/systemd/sleep.conf is added.
It is parsed by systemd-sleep and logind. The strings written
to /sys/power/disk and /sys/power/state can be configured.
This allows people to use different modes of suspend on
systems with broken or special hardware.

Configuration is shared between systemd-sleep and logind
to enable logind to answer the question "can the system be
put to sleep" as correctly as possible without actually
invoking the action. If the user configured systemd-sleep
to only use 'freeze', but current kernel does not support it,
logind will properly report that the system cannot be put
to sleep.

https://bugs.freedesktop.org/show_bug.cgi?id=57793
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=7e73c5ae6e7991a6c01f6d096ff8afaef4458c36
http://lists.freedesktop.org/archives/systemd-devel/2013-February/009238.html

SYSTEM_CONFIG_FILE and USER_CONFIG_FILE defines were removed
since they were used in only a few places and with the
addition of /etc/systemd/sleep.conf it becomes easier to just
append the name of each file to the dir name.

3 files changed, 226 insertions, 7 deletions

diff --git a/man/systemd-sleep.conf.xml b/man/systemd-sleep.conf.xml
new file mode 100644
index 0000000000..dc4b0da68e
--- /dev/null
+++ b/man/systemd-sleep.conf.xml
@@ -0,0 +1,181 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+This file is part of systemd.
+
+Copyright 2013 Zbigniew Jędrzejewski-Szmek
+
+systemd is free software; you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+systemd is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-sleep.conf">
+  <refentryinfo>
+    <title>systemd-sleep.conf</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Developer</contrib>
+        <firstname>Zbigniew</firstname>
+        <surname>Jędrzejewski-Szmek</surname>
+        <email>zbyszek@in.waw.pl</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>systemd-sleep.conf</refentrytitle>
+    <manvolnum>5</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>systemd-sleep.conf</refname>
+    <refpurpose>Suspend and hibernation configuration file</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <para><filename>/etc/systemd/sleep.conf</filename></para>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><command>systemd</command> supports three general
+    power-saving modes:</para>
+
+    <variablelist>
+      <varlistentry>
+        <term>suspend</term>
+
+        <listitem><para>a low-power state
+        where execution of the OS is paused,
+        and complete power loss might result
+        in lost data, and which is fast to
+        enter and exit. This corresponds to
+        suspend, standby, or freeze states as
+        understood by the kernel.
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term>hibernate</term>
+
+        <listitem><para>a low-power state
+        where execution of the OS is paused,
+        and complete power loss does not
+        result in lost data, and which might
+        be slow to enter and exit. This
+        corresponds to the hibernation as
+        understood by the kernel.
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term>hybrid-sleep</term>
+
+        <listitem><para>a low-power state
+        where execution of the OS is paused,
+        which might be slow to enter, and on
+        complete power loss does not result in
+        lost data but might be slower to exit
+        in that case. This mode is called
+        suspend-to-both by the kernel.
+        </para></listitem>
+      </varlistentry>
+    </variablelist>
+
+    <para>Settings in this file determine what strings
+    will be written to
+    <filename>/sys/power/disk</filename> and
+    <filename>/sys/power/state</filename> by
+    <citerefentry><refentrytitle>systemd-sleep</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+    when
+    <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    attempts to suspend or hibernate the machine.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+
+    <para>The following options can be configured in the
+    <literal>[Sleep]</literal> section of
+    <filename>/etc/systemd/sleep.conf</filename>:</para>
+
+    <variablelist class='systemd-directives'>
+      <varlistentry>
+        <term><varname>SuspendMode=</varname></term>
+        <term><varname>HibernateMode=</varname></term>
+        <term><varname>HybridSleepMode=</varname></term>
+
+        <listitem><para>The string to be written to
+        <filename>/sys/power/disk</filename> by,
+        respectively,
+        <citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+        <citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, or
+        <citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+        More than one value can be specified by seperating
+        multiple values with commas. They will be tried
+        in turn, until one is written without error. If
+        neither suceeds, the operation will be aborted.
+        </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>SuspendState=</varname></term>
+        <term><varname>HibernateState=</varname></term>
+        <term><varname>HybridSleepState=</varname></term>
+
+        <listitem><para>The string to be written to
+        <filename>/sys/power/state</filename> by,
+        respectively,
+        <citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+        <citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, or
+        <citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+        More than one value can be specified by seperating
+        multiple values with commas. They will be tried
+        in turn, until one is written without error. If
+        neither suceeds, the operation will be aborted.
+        </para></listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Example: freeze</title>
+
+    <para>Example: to exploit the <quote>freeze</quote> mode added
+    in Linux 3.9, one can use <command>systemctl suspend</command>
+    with
+    <programlisting>
+[Sleep]
+SuspendState=freeze
+    </programlisting></para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd-sleep</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>
diff --git a/man/systemd-suspend.service.xml b/man/systemd-suspend.service.xml
index 9b8bad4791..4a4ed5cbdb 100644
--- a/man/systemd-suspend.service.xml
+++ b/man/systemd-suspend.service.xml
@@ -6,6 +6,7 @@
   This file is part of systemd.
 
   Copyright 2012 Lennart Poettering
+  Copyright 2013 Zbigniew Jędrzejewski-Szmek
 
   systemd is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published by
@@ -63,7 +64,7 @@
                 <para><filename>systemd-suspend.service</filename> is
                 a system service that is pulled in by
                 <filename>suspend.target</filename> and is responsible
-                for the actual system suspend. Similar,
+                for the actual system suspend. Similarly,
                 <filename>systemd-hibernate.service</filename> is
                 pulled in by <filename>hibernate.target</filename> to
                 execute the actual hibernation. Finally,
@@ -88,8 +89,8 @@
                 but the first argument is now
                 "<literal>post</literal>". All executables in this
                 directory are executed in parallel, and execution of
-                the action is not continued before all executables
-                finished.</para>
+                the action is not continued until all executables
+                have finished.</para>
 
                 <para>Note that scripts or binaries dropped in
                 <filename>/usr/lib/systemd/system-sleep/</filename>
@@ -100,7 +101,7 @@
 
                 <para>Note that
                 <filename>systemd-suspend.service</filename>,
-                <filename>systemd-hibernate.service</filename> and
+                <filename>systemd-hibernate.service</filename>, and
                 <filename>systemd-hybrid-sleep.service</filename>
                 should never be executed directly. Instead, trigger
                 system sleep states with a command such as
@@ -108,14 +109,51 @@
                 similar.</para>
 
                 <para>Internally, this service will echo a string like
-                <literal>mem</literal> into
+                "<literal>mem</literal>" into
                 <filename>/sys/power/state</filename>, to trigger the
-                actual system suspend.</para>
+                actual system suspend. What exactly is written
+                where can be configured in the <literal>[Sleep]</literal>
+                section of <filename>/etc/systemd/sleep.conf</filename>.
+                See <citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+                </para>
+        </refsect1>
+
+        <refsect1>
+                <title>Options</title>
+
+                <para><command>systemd-sleep</command> understands the
+                following commands:</para>
+
+                <variablelist>
+                        <varlistentry>
+                                <term><option>-h</option></term>
+                                <term><option>--help</option></term>
+
+                                <listitem><para>Print a short help
+                                text and exit.</para></listitem>
+                        </varlistentry>
+                        <varlistentry>
+                                <term><option>--version</option></term>
+
+                                <listitem><para>Print the systemd version
+                                identifier and exit.</para></listitem>
+                        </varlistentry>
+                        <varlistentry>
+                                <term><option>suspend</option></term>
+                                <term><option>hibernate</option></term>
+                                <term><option>hybrid-sleep</option></term>
+
+                                <listitem><para>Suspend, hibernate, or
+                                put the system to hybrid sleep.</para>
+                                </listitem>
+                        </varlistentry>
+                </variablelist>
         </refsect1>
 
         <refsect1>
                 <title>See Also</title>
                 <para>
+                        <citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
diff --git a/man/systemd.xml b/man/systemd.xml
index cd38c16375..d009ed8e1c 100644
--- a/man/systemd.xml
+++ b/man/systemd.xml
@@ -508,7 +508,7 @@
         <refsect1>
                 <title>Directories</title>
 
-                <variablelist class='unit-directives'>
+                <variablelist>
                         <varlistentry>
                                 <term>System unit directories</term>