Introduce OplusPen

Change-Id: Icfc9d2d8172aa01bf1c71a5a23a8e6387660a746

Pen/Android.bp

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+//
+// SPDX-FileCopyrightText: 2025 The LineageOS Project
+// SPDX-License-Identifier: Apache-2.0
+//
+
+android_app {
+    name: "OplusPen",
+
+    srcs: ["src/**/*.kt"],
+
+    certificate: "platform",
+    platform_apis: true,
+    system_ext_specific: true,
+
+    optimize: {
+        proguard_flags_files: ["proguard.flags"],
+    },
+    required: [
+        "default-permissions_org.lineageos.pen",
+    ],
+}
+
+prebuilt_etc {
+    name: "default-permissions_org.lineageos.pen",
+    system_ext_specific: true,
+    src: "default-permissions_org.lineageos.pen.xml",
+    sub_dir: "default-permissions",
+    filename_from_src: true,
+}

Pen/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    SPDX-FileCopyrightText: 2025 The LineageOS Project
+    SPDX-License-Identifier: Apache-2.0
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="org.lineageos.pen">
+
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+
+    <application
+        android:label="@string/app_name"
+        android:persistent="true"
+        android:usesNonSdkApi="true">
+        <receiver
+            android:exported="true"
+            android:name=".BootCompletedReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </receiver>
+        <service
+            android:exported="false"
+            android:name=".PenService" />
+    </application>
+</manifest>

Pen/default-permissions_org.lineageos.pen.xml

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+<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
+<!--
+    SPDX-FileCopyrightText: 2025 The LineageOS Project
+    SPDX-License-Identifier: Apache-2.0
+-->
+<exceptions>
+    <exception package="org.lineageos.pen">
+        <permission name="android.permission.ACCESS_FINE_LOCATION" fixed="false" />
+        <permission name="android.permission.BLUETOOTH_CONNECT" fixed="false" />
+        <permission name="android.permission.BLUETOOTH_SCAN" fixed="false" />
+        <permission name="android.permission.POST_NOTIFICATIONS" fixed="false" />
+    </exception>
+</exceptions>

Pen/proguard.flags

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+-keep class org.lineageos.pen.* {
+  *;
+}

Pen/res/drawable/ic_stylus.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     SPDX-FileCopyrightText: Material Design Authors / Google LLC
+     SPDX-License-Identifier: Apache-2.0
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="#000000"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M167,840Q146,845 130.5,829.5Q115,814 120,793L160,602L358,800L167,840ZM358,800L160,602L618,144Q641,121 675,121Q709,121 732,144L816,228Q839,251 839,285Q839,319 816,342L358,800ZM675,200L261,614L346,699L760,285Q760,285 760,285Q760,285 760,285L675,200Q675,200 675,200Q675,200 675,200Z" />
+</vector>

Pen/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    SPDX-FileCopyrightText: 2025 The LineageOS Project
+    SPDX-License-Identifier: Apache-2.0
+-->
+<resources>
+    <string name="app_name" translatable="false">OplusPen</string>
+    <string name="pen_attached">Pen attached</string>
+    <string name="tap_to_connect">Tap to connect</string>
+</resources>

Pen/src/org/lineageos/pen/BootCompletedReceiver.kt

@@ -0,0 +1,22 @@
+/*
+ * SPDX-FileCopyrightText: 2025 The LineageOS Project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.lineageos.pen
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.util.Log
+
+class BootCompletedReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+        Log.d(TAG, "Received boot completed intent")
+        context.startService(Intent(context, PenService::class.java))
+    }
+
+    companion object {
+        private const val TAG = "OplusPenBootReceiver"
+    }
+}

Pen/src/org/lineageos/pen/PenService.kt

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+/*
+ * SPDX-FileCopyrightText: 2025 The LineageOS Project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.lineageos.pen
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.app.Service
+import android.bluetooth.BluetoothManager
+import android.bluetooth.le.ScanCallback
+import android.bluetooth.le.ScanFilter
+import android.bluetooth.le.ScanResult
+import android.bluetooth.le.ScanSettings
+import android.content.Context
+import android.content.Intent
+import android.os.IBinder
+import android.os.UEventObserver
+import android.util.Log
+
+class PenService : Service() {
+    private val bluetoothManager by lazy { getSystemService(BluetoothManager::class.java) }
+    private val notificationManager by lazy { getSystemService(NotificationManager::class.java) }
+
+    private val observer = object : UEventObserver() {
+        private val lock = Any()
+
+        override fun onUEvent(event: UEvent) {
+            synchronized(lock) {
+                val pencilStatus = event.get("pencil_status") ?: return
+                val pencilAddr = event.get("pencil_addr")?.chunked(2)?.joinToString(":") {
+                    it.uppercase()
+                } ?: return
+
+                when (pencilStatus) {
+                    "0" -> notificationManager.cancel(NOTIFICATION_ID)
+                    "1" -> postNotification(pencilAddr)
+                }
+            }
+        }
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        intent?.getStringExtra(EXTRA_PENCIL_ADDR)?.let {
+            bondBtDevice(it)
+        }
+
+        return START_STICKY
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    override fun onCreate() {
+        super.onCreate()
+
+        observer.startObserving("DEVPATH=/devices/virtual/oplus_wireless/pencil")
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+
+        observer.stopObserving()
+    }
+
+    private fun bondBtDevice(pencilAddr: String) {
+        val adapter = bluetoothManager.adapter
+        @Suppress("DEPRECATION") adapter.enable()
+
+        val scanner = adapter.bluetoothLeScanner
+        scanner.startScan(
+            listOf(ScanFilter.Builder().setDeviceAddress(pencilAddr).build()),
+            ScanSettings.Builder()
+                .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
+                .setReportDelay(0L)
+                .build(),
+            object : ScanCallback() {
+                override fun onScanResult(callbackType: Int, result: ScanResult) {
+                    super.onScanResult(callbackType, result)
+                    scanner.stopScan(this)
+
+                    result.device.createBond()
+                }
+
+                override fun onBatchScanResults(results: MutableList<ScanResult>) {
+                    super.onBatchScanResults(results)
+                    scanner.stopScan(this)
+                }
+
+                override fun onScanFailed(errorCode: Int) {
+                    super.onScanFailed(errorCode)
+                    scanner.stopScan(this)
+                }
+            }
+        )
+    }
+
+    private fun postNotification(pencilAddr: String) {
+        val adapter = bluetoothManager.adapter
+
+        if (adapter.bondedDevices.contains(adapter.getRemoteDevice(pencilAddr))) {
+            Log.e(TAG, "$pencilAddr already bonded, bailing out")
+            return
+        }
+
+        if (notificationManager.getNotificationChannel(NOTIFICATION_CHANNEL_ID) == null) {
+            notificationManager.createNotificationChannel(
+                NotificationChannel(
+                    NOTIFICATION_CHANNEL_ID,
+                    NOTIFICATION_CHANNEL_ID,
+                    NotificationManager.IMPORTANCE_HIGH
+                )
+            )
+        }
+
+        val contentIntent = PendingIntent.getService(
+            this,
+            0,
+            Intent(this, PenService::class.java).apply {
+                putExtra(EXTRA_PENCIL_ADDR, pencilAddr)
+            },
+            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
+        )
+
+        val notification = Notification.Builder(this, NOTIFICATION_CHANNEL_ID)
+            .setSmallIcon(R.drawable.ic_stylus)
+            .setContentTitle(getString(R.string.pen_attached))
+            .setContentText(getString(R.string.tap_to_connect))
+            .setContentIntent(contentIntent)
+            .setAutoCancel(true)
+            .build()
+        notificationManager.notify(NOTIFICATION_ID, notification)
+    }
+
+    companion object {
+        private const val TAG = "OplusPenService"
+
+        private const val EXTRA_PENCIL_ADDR = "pencil_addr"
+
+        private const val NOTIFICATION_CHANNEL_ID = "OplusPen"
+        private const val NOTIFICATION_ID = 1000
+    }
+}

sepolicy/qti/private/pen_app.te

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+type pen_app, domain, coredomain;
+
+app_domain(pen_app)
+bluetooth_domain(pen_app)
+
+allow pen_app self:netlink_kobject_uevent_socket { create read setopt bind };
+
+allow pen_app app_api_service:service_manager find;

sepolicy/qti/private/seapp_contexts

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+user=_app seinfo=platform name=org.lineageos.pen domain=pen_app type=app_data_file levelFrom=user