light: convert to aidl hal

* hardware/interfaces/light/aidl/default

light/Lights.cpp

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ * Copyright (C) 2023 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.
+ */
+
+#include "Lights.h"
+
+#include <android-base/file.h>
+
+using ::android::base::WriteStringToFile;
+
+namespace aidl::android::hardware::light {
+
+static const std::string backlightFiles[] = {
+    "/sys/class/backlight/rpi_backlight/brightness"
+};
+
+const static std::vector<HwLight> availableLights = {
+    {.id = (int)LightType::BACKLIGHT, .type = LightType::BACKLIGHT, .ordinal = 0}
+};
+
+ndk::ScopedAStatus Lights::setLightState(int id, const HwLightState& state) {
+    HwLight const& light = availableLights[id];
+    std::string const brightness = std::to_string(rgbToBrightness(state));
+
+    switch (light.type) {
+        case LightType::BACKLIGHT:
+            for (auto &file : backlightFiles) {
+                if (!access(file.c_str(), W_OK)) {
+                    WriteStringToFile(brightness, file);
+                }
+            }
+            break;
+        default:
+            return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+    }
+
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus Lights::getLights(std::vector<HwLight>* lights) {
+    for (auto i = availableLights.begin(); i != availableLights.end(); i++) {
+        lights->push_back(*i);
+    }
+
+    return ndk::ScopedAStatus::ok();
+}
+
+uint32_t Lights::rgbToBrightness(const HwLightState& state) {
+    uint32_t color = state.color & 0x00ffffff;
+    return ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) +
+            (29 * (color & 0xff))) >> 8;
+}
+
+}  // aidl::android::hardware::light