initial Raspberry Vanilla AOSP 12 commit

* Audio
  - Based on AOSP hikey audio HAL:
    https://android.googlesource.com/device/linaro/hikey/+/refs/heads/master/audio/
  - ALSA based on Android-x86
  - ALSA loop is used to support HDMI audio on Pi 4 because VC4 HDMI
    audio devices use SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE that is not
    supported on Android
    https://github.com/raspberrypi/linux/issues/4651
    https://github.com/raspberrypi/linux/issues/4654

* Bluetooth
  - AOSP Broadcom vendor stack with some additional fixes from android-rpi

* Camera
  - libcamera for official Raspberry Pi CSI camera modules based on GloDroid
  - AOSP external camera HAL for UVC USB webcams:
    https://source.android.com/docs/core/camera/external-usb-cameras

* Graphics
  - OpenGL & Vulkan: upstream Mesa with GloDroid patches
  - Upstream drm_hwcomposer with force resolution patch from Android-x86 and
    my additional fixes
  - minigbm based on GloDroid

* Health
  - Based on AOSP cuttlefish health HAL

* Kernel
  - Merge of Raspberry Pi and AOSP common kernel with my additional fixes
    and configurations
    https://github.com/raspberrypi/linux
    https://android.googlesource.com/kernel/common/

* Lights
  - Based on LineageOS Xiaomi msm8996-common lights HAL

* suspend_blocker
  - Based on AOSP cuttlefish

* v4l2_codec2
  - Based on AOSP with my Raspberry Pi 4 specific fixes

* Wifi
  - AOSP Broadcom vendor stack with my additional fixes

light/Android.bp

@@ -0,0 +1,24 @@
+// Copyright (C) 2018 The LineageOS Project
+// Copyright (C) 2021-2022 KonstaKANG
+//
+// SPDX-License-Identifier: Apache-2.0
+
+cc_binary {
+    name: "android.hardware.light@2.0-service.rpi",
+    init_rc: ["android.hardware.light@2.0-service.rpi.rc"],
+    vintf_fragments: ["android.hardware.light@2.0-service.rpi.xml"],
+    proprietary: true,
+    relative_install_path: "hw",
+    srcs: [
+         "Light.cpp",
+         "service.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+        "libcutils",
+        "libhardware",
+        "libhidlbase",
+        "libutils",
+        "android.hardware.light@2.0",
+    ],
+}

light/Light.cpp

@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2018 The LineageOS Project
+ * Copyright (C) 2021-2022 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+#define LOG_TAG "LightService"
+
+#include "Light.h"
+
+#include <android-base/logging.h>
+
+namespace {
+using android::hardware::light::V2_0::LightState;
+
+static constexpr int DEFAULT_MAX_BRIGHTNESS = 255;
+
+static uint32_t rgbToBrightness(const LightState& state) {
+    uint32_t color = state.color & 0x00ffffff;
+    return ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) +
+            (29 * (color & 0xff))) >> 8;
+}
+}  // anonymous namespace
+
+namespace android {
+namespace hardware {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+Light::Light(std::pair<std::ofstream, uint32_t>&& lcd_backlight)
+    : mLcdBacklight(std::move(lcd_backlight)) {
+    auto backlightFn(std::bind(&Light::setLcdBacklight, this, std::placeholders::_1));
+    mLights.emplace(std::make_pair(Type::BACKLIGHT, backlightFn));
+}
+
+// Methods from ::android::hardware::light::V2_0::ILight follow.
+Return<Status> Light::setLight(Type type, const LightState& state) {
+    auto it = mLights.find(type);
+
+    if (it == mLights.end()) {
+        return Status::LIGHT_NOT_SUPPORTED;
+    }
+
+    it->second(state);
+
+    return Status::SUCCESS;
+}
+
+Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
+    std::vector<Type> types;
+
+    for (auto const& light : mLights) {
+        types.push_back(light.first);
+    }
+
+    _hidl_cb(types);
+
+    return Void();
+}
+
+void Light::setLcdBacklight(const LightState& state) {
+    std::lock_guard<std::mutex> lock(mLock);
+
+    uint32_t brightness = rgbToBrightness(state);
+
+    // If max panel brightness is not the default (255),
+    // apply linear scaling across the accepted range.
+    if (mLcdBacklight.second != DEFAULT_MAX_BRIGHTNESS) {
+        int old_brightness = brightness;
+        brightness = brightness * mLcdBacklight.second / DEFAULT_MAX_BRIGHTNESS;
+        LOG(VERBOSE) << "scaling brightness " << old_brightness << " => " << brightness;
+    }
+
+    mLcdBacklight.first << brightness << std::endl;
+}
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace hardware
+}  // namespace android

light/Light.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2018 The LineageOS Project
+ * Copyright (C) 2021-2022 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+#ifndef ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H
+#define ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H
+
+#include <android/hardware/light/2.0/ILight.h>
+#include <hidl/Status.h>
+
+#include <fstream>
+#include <mutex>
+#include <unordered_map>
+
+namespace android {
+namespace hardware {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+struct Light : public ILight {
+    Light(std::pair<std::ofstream, uint32_t>&& lcd_backlight);
+
+    // Methods from ::android::hardware::light::V2_0::ILight follow.
+    Return<Status> setLight(Type type, const LightState& state) override;
+    Return<void> getSupportedTypes(getSupportedTypes_cb _hidl_cb) override;
+
+  private:
+    void setLcdBacklight(const LightState& state);
+
+    std::pair<std::ofstream, uint32_t> mLcdBacklight;
+
+    std::unordered_map<Type, std::function<void(const LightState&)>> mLights;
+    std::mutex mLock;
+};
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H

light/android.hardware.light@2.0-service.rpi.rc

@@ -0,0 +1,11 @@
+on init
+    chown system system /sys/class/backlight/rpi_backlight/brightness
+    chmod 660 /sys/class/backlight/rpi_backlight/brightness
+
+service vendor.light-hal-2-0 /vendor/bin/hw/android.hardware.light@2.0-service.rpi
+    interface android.hardware.light@2.0::ILight default
+    class hal
+    user system
+    group system
+    # shutting off lights while powering-off
+    shutdown critical

light/android.hardware.light@2.0-service.rpi.xml

@@ -0,0 +1,11 @@
+<manifest version="1.0" type="device">
+    <hal format="hidl">
+        <name>android.hardware.light</name>
+        <transport>hwbinder</transport>
+        <version>2.0</version>
+        <interface>
+            <name>ILight</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>

light/service.cpp

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2018 The LineageOS Project
+ * Copyright (C) 2021-2022 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+#define LOG_TAG "android.hardware.light@2.0-service.rpi"
+
+#include <android-base/logging.h>
+#include <hidl/HidlTransportSupport.h>
+#include <utils/Errors.h>
+
+#include "Light.h"
+
+// libhwbinder:
+using android::hardware::configureRpcThreadpool;
+using android::hardware::joinRpcThreadpool;
+
+// Generated HIDL files
+using android::hardware::light::V2_0::ILight;
+using android::hardware::light::V2_0::implementation::Light;
+
+const static std::string kLcdBacklightPath = "/sys/class/backlight/rpi_backlight/brightness";
+
+int main() {
+    uint32_t lcdMaxBrightness = 255;
+
+    std::ofstream lcdBacklight(kLcdBacklightPath);
+    if (!lcdBacklight) {
+        LOG(ERROR) << "Failed to open " << kLcdBacklightPath << ", error=" << errno
+                   << " (" << strerror(errno) << ")";
+        //return -errno;
+    }
+
+    android::sp<ILight> service = new Light(
+            {std::move(lcdBacklight), lcdMaxBrightness});
+
+    configureRpcThreadpool(1, true);
+
+    android::status_t status = service->registerAsService();
+
+    if (status != android::OK) {
+        LOG(ERROR) << "Cannot register Light HAL service";
+        //return 1;
+    }
+
+    LOG(INFO) << "Light HAL Ready.";
+    joinRpcThreadpool();
+    // Under normal cases, execution will not reach this line.
+    LOG(ERROR) << "Light HAL failed to join thread pool.";
+    return 1;
+}