add linux_dpms package

packages/linux_dpms/.gitignore

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+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/
+
+# Avoid committing pubspec.lock for library packages; see
+# https://dart.dev/guides/libraries/private-files#pubspeclock.
+pubspec.lock

packages/linux_dpms/LICENSE

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+MIT License
+
+Copyright (c) 2023 Klaralvdalens Datakonsult AB
+
+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.

packages/linux_dpms/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

packages/linux_dpms/lib/linux_dpms.dart

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+export 'src/linux_dpms_stub.dart'
+    if (dart.library.io) 'src/linux_dpms.dart'
+    if (dart.library.js) 'src/linux_dpms_web.dart';
+export 'src/dpms_power_state.dart';

packages/linux_dpms/lib/src/dpms_power_state.dart

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+/*
+https://github.com/torvalds/linux/blob/master/include/uapi/drm/drm_mode.h#L143
+/* bit compatible with the xorg definitions. */
+#define DRM_MODE_DPMS_ON	0
+#define DRM_MODE_DPMS_STANDBY	1
+#define DRM_MODE_DPMS_SUSPEND	2
+#define DRM_MODE_DPMS_OFF	3
+*/
+enum DpmsPowerState {
+  on(0),
+  standby(1),
+  suspend(2),
+  off(3);
+
+  final int value;
+  const DpmsPowerState(this.value);
+}

packages/linux_dpms/lib/src/linux_dpms.dart

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+import 'dart:ffi' as ffi;
+import 'package:linux_dpms/src/dpms_power_state.dart';
+
+/*
+uint32_t dpms_isAvailable();
+void dpms_setProperty(uint64_t value);
+uint64_t dpms_getProperty();
+*/
+
+typedef DpmsGetPropertyFuncType = ffi.Uint64 Function();
+typedef DpmsGetPropertyType = int Function();
+
+typedef DpmsSetPropertyFuncType = ffi.Void Function(ffi.Uint64 value);
+typedef DpmsSetPropertyType = void Function(int value);
+
+typedef DpmsIsAvailableFuncType = ffi.Uint32 Function();
+typedef DpmsIsAvailableType = int Function();
+
+class DpmsLinux {
+  final _DpmsLinux _service = _DpmsLinux.instance;
+  bool isAvailable() {
+    if (_service.dpmsIsAvailable == null || _service.dpmsSetProperty == null) {
+      return false;
+    }
+    return true;
+  }
+
+  void setPowerState(DpmsPowerState state) {
+    if (_service.dpmsSetProperty != null) {
+      _service.dpmsSetProperty!(state.value);
+    }
+    return;
+  }
+
+  DpmsPowerState getPowerState() {
+    if (_service.dpmsGetProperty != null) {
+      final value = _service.dpmsGetProperty!();
+      return DpmsPowerState.values.firstWhere((item) => item.value == value);
+    }
+    return DpmsPowerState.on;
+  }
+}
+
+class _DpmsLinux {
+  final DpmsIsAvailableType? dpmsIsAvailable;
+  final DpmsGetPropertyType? dpmsGetProperty;
+  final DpmsSetPropertyType? dpmsSetProperty;
+
+  _DpmsLinux._constructor({
+    required this.dpmsIsAvailable,
+    required this.dpmsGetProperty,
+    required this.dpmsSetProperty,
+  });
+
+  factory _DpmsLinux._() {
+    final lib = ffi.DynamicLibrary.process();
+
+    try {
+      final dpmsIsAvailable = lib.lookupFunction<DpmsIsAvailableFuncType, DpmsIsAvailableType>("dpms_isAvailable");
+      final dpmsGetProperty = lib.lookupFunction<DpmsGetPropertyFuncType, DpmsGetPropertyType>("dpms_getProperty");
+      final dpmsSetProperty = lib.lookupFunction<DpmsSetPropertyFuncType, DpmsSetPropertyType>("dpms_setProperty");
+
+      return _DpmsLinux._constructor(
+        dpmsIsAvailable: dpmsIsAvailable,
+        dpmsGetProperty: dpmsGetProperty,
+        dpmsSetProperty: dpmsSetProperty,
+      );
+    } on ArgumentError {
+      return _DpmsLinux._constructor(
+        dpmsIsAvailable: null,
+        dpmsGetProperty: null,
+        dpmsSetProperty: null,
+      );
+    }
+  }
+
+  static _DpmsLinux? _instance;
+
+  static _DpmsLinux get instance {
+    _instance ??= _DpmsLinux._();
+    return _instance!;
+  }
+}

packages/linux_dpms/lib/src/linux_dpms_stub.dart

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+import 'package:linux_dpms/src/dpms_power_state.dart';
+
+class DpmsLinux {
+  bool isAvailable() {
+    throw UnimplementedError();
+  }
+
+  void setPowerState(DpmsPowerState state) {
+    throw UnimplementedError();
+  }
+
+  DpmsPowerState getPowerState() {
+    throw UnimplementedError();
+  }
+}

packages/linux_dpms/lib/src/linux_dpms_web.dart

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+import 'package:linux_dpms/src/dpms_power_state.dart';
+
+class DpmsLinux {
+  bool isAvailable() {
+    return false;
+  }
+
+  void setPowerState(DpmsPowerState state) {}
+
+  DpmsPowerState getPowerState() {
+    return DpmsPowerState.on;
+  }
+}

packages/linux_dpms/pubspec.yaml

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+name: linux_dpms
+description: Package for using DPMS on linux.
+version: 0.1.0+1
+repository: https://github.com/ardera/flutter_packages
+
+environment:
+  sdk: '>=3.0.0 <4.0.0'
+
+dev_dependencies:
+  lints: ^3.0.0
+  test: ^1.21.0
+
+