119 lines
4.0 KiB
Plaintext
119 lines
4.0 KiB
Plaintext
Desc: NUT integration with FreeDesktop HAL - Hardware Abstraction Layer
|
|
File: nut-hal.txt
|
|
Date: 05 March 2008
|
|
Auth: Arnaud Quette <aquette.dev@gmail.com>
|
|
|
|
This document introduces NUT integration with FreeDesktop HAL
|
|
(Hardware Abstraction Layer), also called Integrated Power Management (IPM).
|
|
|
|
Introduction
|
|
------------
|
|
|
|
This feature, also known as the Common Power Management integration,
|
|
allows NUT drivers to feed the HAL system, which will itself feeds
|
|
applications such as the Gnome Power Manager, in charge of the
|
|
system protection and notification.
|
|
|
|
This allows a better integration with the HAL supported systems
|
|
(Linux, *BSD and Solaris), and to reuse applications that have
|
|
been written to support laptop batteries. This also means that
|
|
we avoid the code / application redundancy by not using the upsd
|
|
and upsmon / NUT Client layer.
|
|
|
|
Since the NUT driver subset is limited to USB only, at least for
|
|
the moment, this should allow this feature to be shipped with a
|
|
base system.
|
|
|
|
From a user point of view, since all the needed components are
|
|
present on the system, we can achieve a full plug and play system.
|
|
That is to say when you plug your USB UPS, the needed driver is
|
|
automatically loaded and the according application (ie GPM) is
|
|
made available (displayed) at runtime without having to install
|
|
anything else than the base system. Nothing more to install,
|
|
nothing more to configure...
|
|
|
|
Detailed usage
|
|
---------------
|
|
|
|
Since this feature is still a work in progress, the below information
|
|
details how to get, install and test it.
|
|
|
|
Note that the minimum HAL version required is 0.5.8
|
|
|
|
* install libhal-dev and its dependencies (libdbus-dev)
|
|
or equivalent packages for your system.
|
|
|
|
* "./configure --with-hal && make" from within the nut dir
|
|
|
|
* either do a "make install" or simply copy the file
|
|
drivers/hald-addon* to the HAL addons directory (ie
|
|
/usr/lib/hal/ on Debian) or equivalent dir.
|
|
|
|
* copy the scripts/hal/20-ups-nut-device.fdi file to
|
|
$datadir/hal/fdi/information/20thirdparty
|
|
for example on Debian: /usr/share/hal/fdi/information/20thirdparty/
|
|
|
|
* create the (nut user and) group for the udev rule:
|
|
addgroup --quiet --system nut
|
|
|
|
* add the hal user (ex: haldaemon) to the nut group using:
|
|
adduser --quiet haldaemon nut
|
|
|
|
* restart HAL (ie using "/etc/init.d/dbus restart").
|
|
I've personaly used "killall hal" and restarted it using
|
|
"hald --daemon=no --verbose=yes" to see the verbose logs
|
|
|
|
* plug your UPS' USB cord into your computer
|
|
|
|
* you should now see the UPS using:
|
|
- [kde-]hal-device-manager,
|
|
- gnome power manager (standard applet for battery management), which
|
|
will pop up and state that there is an UPS
|
|
- ...
|
|
|
|
Packaging information
|
|
---------------------
|
|
|
|
The HAL support in NUT must currently be packaged separatly (ie in a
|
|
specific nut-hal package) and must conflict with the classic nut packages.
|
|
This is in order to:
|
|
- allow shipping of the HAL support only in the base system,
|
|
without including all the NUT drivers and software,
|
|
- prevent the NUT HAL addons to get an exclusive
|
|
and automatic access on a device, when a user only want to use the
|
|
USB support with a classic NUT installation.
|
|
|
|
This will be addressed when the new NUT configuration framework
|
|
will be merged in the main code branch.
|
|
|
|
Developing information
|
|
----------------------
|
|
|
|
As of NUT 2.2.2, the HAL integration also provide a DBus interface to
|
|
allow the calling of two method:
|
|
- Shutdown
|
|
- SetBeeper (boolean)
|
|
|
|
Example:
|
|
dbus-send --system --print-reply --dest=org.freedesktop.Hal \
|
|
/org/freedesktop/Hal/devices/usb_device_463_ffff_1H2E300AH \
|
|
org.freedesktop.Hal.Device.UPS.Shutdown
|
|
|
|
For development purposes, you might want to set the environment variable
|
|
"NUT_HAL_DEBUG" to something between "1" and "5". This matches the NUT debug
|
|
levels (-DDDDD).
|
|
|
|
Credits
|
|
-------
|
|
|
|
Thanks to the following people who made this possible:
|
|
- David Zeuthen, HAL Project Leader,
|
|
- Richard Hughes, Gnome Power Manager Developer.
|
|
|
|
References
|
|
----------
|
|
|
|
* FreeDesktop HAL: http://freedesktop.org/wiki/Software_2fhal
|
|
* Gnome Power Manager: http://www.gnome.org/projects/gnome-power-manager/
|
|
|