NEW: HIDAPI for Desktop Linux (#2231)

Co-authored-by: Håkan Sidenvall <hakan.sidenvall@unity3d.com>

Author: kalana-sahabandu

Assets/Tests/InputSystem/Plugins/DualShockTests.cs

@@ -1,7 +1,7 @@
 using UnityEngine.InputSystem;
 using UnityEngine.InputSystem.LowLevel;
 using UnityEngine.InputSystem.DualShock;
-#if UNITY_EDITOR || UNITY_STANDALONE_OSX || UNITY_STANDALONE_WIN || UNITY_WSA
+#if UNITY_EDITOR || UNITY_STANDALONE_OSX || UNITY_STANDALONE_WIN || UNITY_WSA || UNITY_STANDALONE_LINUX
 using UnityEngine.InputSystem.DualShock.LowLevel;
 #endif
 using UnityEngine.InputSystem.Processors;
@@ -18,7 +18,7 @@
 
 internal class DualShockTests : CoreTestsFixture
 {
-#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA
+#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA || UNITY_STANDALONE_LINUX
     public DualShockGamepad Devices_SupportsDualShockAsHID<TDevice, TState>(TState state)
         where TDevice : DualShockGamepad
         where TState : struct, IInputStateTypeInfo

Packages/com.unity.inputsystem/InputSystem/InputSystem.cs

@@ -3822,7 +3822,7 @@ private static void PerformDefaultPluginInitialization()
             WebGL.WebGLSupport.Initialize();
             #endif
 
-            #if UNITY_EDITOR || UNITY_STANDALONE_OSX || UNITY_STANDALONE_WIN || UNITY_WSA
+            #if UNITY_EDITOR || UNITY_STANDALONE_OSX || UNITY_STANDALONE_WIN || UNITY_STANDALONE_LINUX || UNITY_WSA
             Switch.SwitchSupportHID.Initialize();
             #endif
 

Packages/com.unity.inputsystem/InputSystem/Plugins/DualShock/DualShockGamepadHID.cs

@@ -1,4 +1,4 @@
-#if UNITY_EDITOR || UNITY_STANDALONE_OSX || UNITY_STANDALONE_WIN || UNITY_WSA || PACKAGE_DOCS_GENERATION
+#if UNITY_EDITOR || UNITY_STANDALONE_OSX || UNITY_STANDALONE_WIN || UNITY_STANDALONE_LINUX || UNITY_WSA || PACKAGE_DOCS_GENERATION
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;

Packages/com.unity.inputsystem/InputSystem/Plugins/DualShock/DualShockSupport.cs

@@ -26,7 +26,7 @@ public static void Initialize()
             //       or none at all. E.g. when connected via Bluetooth on OSX, the DualShock will
             //       not return anything from IOHIDDevice_GetProduct() and IOHIDevice_GetManufacturer()
             //       even though it will report the expected results when plugged in via USB.
-            #if UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA || UNITY_EDITOR
+            #if UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA || UNITY_EDITOR || UNITY_STANDALONE_LINUX
             InputSystem.RegisterLayout<DualSenseGamepadHID>(
                 matches: new InputDeviceMatcher()
                     .WithInterface("HID")

Packages/com.unity.inputsystem/InputSystem/Plugins/Switch/SwitchProControllerHID.cs

@@ -1,4 +1,4 @@
-#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA || PACKAGE_DOCS_GENERATION
+#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_STANDALONE_LINUX || UNITY_WSA || PACKAGE_DOCS_GENERATION
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -12,7 +12,7 @@
 
 namespace UnityEngine.InputSystem.Switch.LowLevel
 {
-#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA
+#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_STANDALONE_LINUX || UNITY_WSA
     /// <summary>
     /// Structure of HID input reports for Switch Pro controllers.
     /// </summary>
@@ -142,7 +142,7 @@ public void Release(Button button)
 
 namespace UnityEngine.InputSystem.Switch
 {
-#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA || PACKAGE_DOCS_GENERATION
+#if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_STANDALONE_LINUX || UNITY_WSA || PACKAGE_DOCS_GENERATION
     /// <summary>
     /// A Nintendo Switch Pro controller connected to a desktop mac/windows PC using the HID interface.
     /// </summary>

Packages/com.unity.inputsystem/InputSystem/Plugins/Switch/SwitchSupportHID.cs

@@ -1,4 +1,4 @@
-#if UNITY_EDITOR || UNITY_SWITCH || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_WSA
+#if UNITY_EDITOR || UNITY_SWITCH || UNITY_STANDALONE_WIN || UNITY_STANDALONE_LINUX || UNITY_STANDALONE_OSX || UNITY_WSA
 using UnityEngine.InputSystem.Layouts;
 
 namespace UnityEngine.InputSystem.Switch