hidl: Implement vendor.lineage.touch@1.0 HAL for Xiaomi

* This can be used by any Xiaomi device that has a touch display that supports multiple sample rates and Xiaomi touch.
* Most newer Xiaomi phones with high screen refresh rates fit this category:
* e.g. Mi 10/Pro/Ultra/T/T Pro, Xiaomi SM8350 platform phones & Xiaomi SM6375 phones

Change-Id: Iaf956420157bbc978690fac9053d507ccaea847a

hidl/touch/.clang-format

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+../../../../build/soong/scripts/system-clang-format

hidl/touch/Android.bp

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+//
+// Copyright (C) 2022 The LineageOS Project
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+cc_binary {
+    name: "vendor.lineage.touch@1.0-service.xiaomi",
+    vintf_fragments: ["vendor.lineage.touch@1.0-service.xiaomi.xml"],
+    init_rc: ["vendor.lineage.touch@1.0-service.xiaomi.rc"],
+    defaults: ["hidl_defaults"],
+    relative_install_path: "hw",
+    proprietary: true,
+    srcs: [
+        "HighTouchPollingRate.cpp",
+        "service.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+        "libbinder",
+        "libhidlbase",
+        "libutils",
+        "vendor.lineage.touch@1.0",
+    ],
+}

hidl/touch/HighTouchPollingRate.cpp

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+/*
+ * Copyright (C) 2022 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define LOG_TAG "HighTouchPollingRateService"
+
+#include "HighTouchPollingRate.h"
+
+#include <fstream>
+
+namespace vendor {
+namespace lineage {
+namespace touch {
+namespace V1_0 {
+namespace implementation {
+
+#define HIGH_TOUCH_POLLING_PATH = "/sys/devices/virtual/touch/touch_dev/bump_sample_rate"
+
+Return<bool> HighTouchPollingRate::isEnabled() {
+    std::ifstream file(HIGH_TOUCH_POLLING_PATH);
+    int enabled;
+    file >> enabled;
+
+    return enabled == 1;
+}
+
+Return<bool> HighTouchPollingRate::setEnabled(bool enabled) {
+    std::ofstream file(HIGH_TOUCH_POLLING_PATH);
+    file << (enabled ? "1" : "0");
+    return !file.fail();
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace touch
+}  // namespace lineage
+}  // namespace vendor

hidl/touch/HighTouchPollingRate.h

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+/*
+ * Copyright (C) 2022 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include <vendor/lineage/touch/1.0/IHighTouchPollingRate.h>
+
+namespace vendor {
+namespace lineage {
+namespace touch {
+namespace V1_0 {
+namespace implementation {
+
+using ::android::hardware::Return;
+
+class HighTouchPollingRate : public IHighTouchPollingRate {
+  public:
+    // Methods from ::vendor::lineage::touch::V1_0::IHighTouchPollingRate follow.
+    Return<bool> isEnabled() override;
+    Return<bool> setEnabled(bool enabled) override;
+};
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace touch
+}  // namespace lineage
+}  // namespace vendor

hidl/touch/service.cpp

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+/*
+ * Copyright (C) 2022 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define LOG_TAG "lineage.touch@1.0-service.xiaomi"
+
+#include <android-base/logging.h>
+#include <hidl/HidlTransportSupport.h>
+
+#include "HighTouchPollingRate.h"
+
+using ::vendor::lineage::touch::V1_0::IHighTouchPollingRate;
+using ::vendor::lineage::touch::V1_0::implementation::HighTouchPollingRate;
+
+int main() {
+    android::sp<IHighTouchPollingRate> highTouchPollingRate = new HighTouchPollingRate();
+
+    android::hardware::configureRpcThreadpool(1, true);
+
+    if (highTouchPollingRate->registerAsService() != android::OK) {
+        LOG(ERROR) << "Cannot register touchscreen high polling rate HAL service.";
+        return 1;
+    }
+
+    LOG(INFO) << "Touchscreen HAL service ready.";
+
+    android::hardware::joinRpcThreadpool();
+
+    LOG(ERROR) << "Touchscreen HAL service failed to join thread pool.";
+    return 1;
+}

hidl/touch/vendor.lineage.touch@1.0-service.xiaomi.rc

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+service vendor.touch-hal-1-0 /vendor/bin/hw/vendor.lineage.touch@1.0-service.xiaomi
+    interface vendor.lineage.touch@1.0::IHighTouchPollingRate default
+    class hal
+    user system
+    group system

hidl/touch/vendor.lineage.touch@1.0-service.xiaomi.xml

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+<manifest version="1.0" type="device">
+    <hal format="hidl">
+        <name>vendor.lineage.touch</name>
+        <transport>hwbinder</transport>
+        <version>1.0</version>
+        <interface>
+            <name>IHighTouchPollingRate</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>