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Open webOS component to manage charging and battery monitoring


Powerd is one of the primary daemons that is started when webOS boots. It is responsible for monitoring battery parameters like temperature, current, voltage and other inputs, and making decisions about battery charging. It interfaces with the underlying hardware using the Nyx client library, talking to the battery and charger modules for the platform. At the same time it exposes the battery and charging information to the upper layers through the Luna Service Bus. Powerd also has the capability to run the necessary CTIA checks for temperature limits on the platform.

How to Build on Linux


Below are the tools and libraries (and their minimum versions) required to build powerd:

  • cmake (version required by openwebos/cmake-modules-webos)
  • gcc 4.6.3
  • glib-2.0 2.32.1
  • make (any version)
  • openwebos/cjson 1.8.0
  • openwebos/cmake-modules-webos 1.0.0 RC3
  • openwebos/luna-service2 3.0.0
  • openwebos/nyx-lib 2.0.0 RC2
  • pkg-config 0.26


Once you have downloaded the source, enter the following to build it (after changing into the directory under which it was downloaded):

$ mkdir BUILD
$ cd BUILD
$ cmake ..
$ make
$ sudo make install

The directory under which the files are installed defaults to /usr/local/webos. You can install them elsewhere by supplying a value for WEBOS_INSTALL_ROOT when invoking cmake. For example:

$ cmake -D WEBOS_INSTALL_ROOT:PATH=$HOME/projects/openwebos ..
$ make
$ make install

will install the files in subdirectories of $HOME/projects/openwebos.

Specifying WEBOS_INSTALL_ROOT also causes pkg-config to look in that tree first before searching the standard locations. You can specify additional directories to be searched prior to this one by setting the PKG_CONFIG_PATH environment variable.

If not specified, WEBOS_INSTALL_ROOT defaults to /usr/local/webos.

To configure for a debug build, enter:


To see a list of the make targets that cmake has generated, enter:

$ make help


From the directory where you originally ran make install, enter:

$ [sudo] make uninstall

You will need to use sudo if you did not specify WEBOS_INSTALL_ROOT.

Copyright and License Information

Unless otherwise specified, all content, including all source code files and documentation files in this repository are:

Copyright (c) 2007-2012 Hewlett-Packard Development Company, L.P.

Unless otherwise specified or set forth in the NOTICE file, all content, including all source code files and documentation files in this repository are: Licensed under the Apache License, Version 2.0 (the "License"); you may not use this content except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.