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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182<?xml version="1.0" encoding="UTF-8"?><protocol name="session_backlight_v1" version="1"> <copyright> Copyright (c) 2026 Oskar Rochowiak
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. </copyright>
<object name="session_backlight_manager" version="1"> <description summary="backlight control"> Interface for creating objects for backlight and LED devices. A client may only create or modify an object while it owns an active local session. </description> <s2c name="error"> <description summary="device object creation failed"/> <arg name="code" type="enum" interface="error_code" summary="error kind"/> <arg name="message" type="varchar" summary="human-readable error detail"/> </s2c> <c2s name="get_device"> <description summary="create a device object"> Creates a `session_backlight_device` object for the device identified by subsystem and name. The subsystem must be `backlight` or `leds`. </description> <arg name="subsystem" type="varchar" summary="backlight or leds"/> <arg name="name" type="varchar" summary="device name"/> <returns iface="session_backlight_device"/> </c2s> <c2s name="destroy" destructor="true"> <description summary="destroy this object"/> </c2s> </object>
<object name="session_backlight_device" version="1"> <description summary="backlight or LED device"> Interface for changing the brightness of one device selected by the subsystem and name passed to `get_device`. A client may only perform an operation while it owns an active local session. The result of each operation is reported with done or error. </description> <s2c name="done"> <description summary="last operation completed successfully"/> </s2c> <s2c name="error"> <description summary="last operation failed"/> <arg name="code" type="enum" interface="error_code" summary="error kind"/> <arg name="message" type="varchar" summary="human-readable error detail"/> </s2c> <c2s name="set_brightness"> <description summary="set this device brightness"> Sets brightness for this device in /sys/class/backlight or /sys/class/leds. </description> <arg name="brightness" type="uint" summary="new brightness value"/> </c2s> <c2s name="destroy" destructor="true"> <description summary="destroy this object"/> </c2s> </object>
<enum name="error_code"> <value idx="0" name="permission_denied" summary="client has no active local session"/> <value idx="1" name="invalid_args" summary="unsupported subsystem or brightness value"/> <value idx="2" name="io" summary="device could not be opened or written"/> </enum></protocol>