Add AIDL Light HAL Support

This change add support for Light HAL Implementation using AIDL

Change-Id: I444994ff1a1ca22134e7ef6db13043fd2c06e8a8

6 files changed, 224 insertions, 0 deletions

diff --git a/lights/Android.bp b/lights/Android.bp
new file mode 100644
index 0000000..cd4c44e
--- /dev/null
+++ b/lights/Android.bp
@@ -0,0 +1,18 @@
+cc_binary {
+    name: "android.hardware.lights-service.qti",
+    relative_install_path: "hw",
+    init_rc: ["android.hardware.lights-qti.rc"],
+    vintf_fragments: ["android.hardware.lights-qti.xml"],
+    vendor: true,
+    shared_libs: [
+        "libbase",
+        "liblog",
+        "libhardware",
+        "libbinder_ndk",
+        "android.hardware.light-ndk_platform",
+    ],
+    srcs: [
+        "Lights.cpp",
+        "main.cpp",
+    ],
+}
diff --git a/lights/Lights.cpp b/lights/Lights.cpp
new file mode 100644
index 0000000..aa288b0
--- /dev/null
+++ b/lights/Lights.cpp
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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 <log/log.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace light {
+
+const static std::map<LightType, const char*> kLogicalLights = {
+    {LightType::BACKLIGHT,     LIGHT_ID_BACKLIGHT},
+    {LightType::KEYBOARD,      LIGHT_ID_KEYBOARD},
+    {LightType::BUTTONS,       LIGHT_ID_BUTTONS},
+    {LightType::BATTERY,       LIGHT_ID_BATTERY},
+    {LightType::NOTIFICATIONS, LIGHT_ID_NOTIFICATIONS},
+    {LightType::ATTENTION,     LIGHT_ID_ATTENTION},
+    {LightType::BLUETOOTH,     LIGHT_ID_BLUETOOTH},
+    {LightType::WIFI,          LIGHT_ID_WIFI}
+};
+
+light_device_t* getLightDevice(const char* name) {
+    light_device_t* lightDevice;
+    const hw_module_t* hwModule = NULL;
+    int ret = hw_get_module (LIGHTS_HARDWARE_MODULE_ID, &hwModule);
+    if (ret == 0) {
+        ret = hwModule->methods->open(hwModule, name,
+            reinterpret_cast<hw_device_t**>(&lightDevice));
+        if (ret != 0) {
+            ALOGE("light_open %s %s failed: %d", LIGHTS_HARDWARE_MODULE_ID, name, ret);
+        }
+    } else {
+        ALOGE("hw_get_module %s %s failed: %d", LIGHTS_HARDWARE_MODULE_ID, name, ret);
+    }
+    if (ret == 0) {
+        return lightDevice;
+    } else {
+        ALOGE("Light passthrough failed to load legacy HAL.");
+        return nullptr;
+    }
+}
+
+Lights::Lights() {
+    std::map<LightType, light_device_t*> lights;
+    std::vector<HwLight> availableLights;
+    for(auto const &pair : kLogicalLights) {
+        LightType type = pair.first;
+        const char* name = pair.second;
+        light_device_t* lightDevice = getLightDevice(name);
+        if (lightDevice != nullptr) {
+            lights[type] = lightDevice;
+        }
+        HwLight hwLight{};
+        hwLight.id = availableLights.size();
+        hwLight.type = type;
+        hwLight.ordinal = 0;
+        availableLights.emplace_back(hwLight);
+    }
+    mAvailableLights = availableLights;
+    mLights = lights;
+}
+
+ndk::ScopedAStatus Lights::setLightState(int id, const HwLightState& state) {
+    if (id >= mAvailableLights.size()) {
+        ALOGE("Invalid Light id : %d", id);
+        return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+    }
+    HwLight const& light = mAvailableLights[id];
+    auto it = mLights.find(light.type);
+    if (it == mLights.end()) {
+        ALOGE("Light not supported");
+        return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+    }
+    light_device_t* hwLight = it->second;
+    light_state_t legacyState {
+        .color = static_cast<unsigned int>(state.color),
+        .flashMode = static_cast<int>(state.flashMode),
+        .flashOnMS = state.flashOnMs,
+        .flashOffMS = state.flashOffMs,
+        .brightnessMode = static_cast<int>(state.brightnessMode),
+    };
+    int ret = hwLight->set_light(hwLight, &legacyState);
+    switch (ret) {
+        case -ENOSYS:
+            return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+        case 0:
+            return ndk::ScopedAStatus::ok();
+        default:
+            return ndk::ScopedAStatus::fromServiceSpecificError(ret);
+    }
+}
+
+ndk::ScopedAStatus Lights::getLights(std::vector<HwLight>* lights) {
+    for (auto i = mAvailableLights.begin(); i != mAvailableLights.end(); i++) {
+        lights->push_back(*i);
+    }
+    return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace light
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/lights/Lights.h b/lights/Lights.h
new file mode 100644
index 0000000..879ea55
--- /dev/null
+++ b/lights/Lights.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/light/BnLights.h>
+#include <hardware/hardware.h>
+#include <hardware/lights.h>
+#include <map>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace light {
+
+class Lights : public BnLights {
+    public:
+      Lights();
+      ndk::ScopedAStatus setLightState(int id, const HwLightState& state) override;
+      ndk::ScopedAStatus getLights(std::vector<HwLight>* types) override;
+
+    private:
+      std::map<LightType, light_device_t*> mLights;
+      std::vector<HwLight> mAvailableLights;
+};
+
+}  // namespace light
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/lights/android.hardware.lights-qti.rc b/lights/android.hardware.lights-qti.rc
new file mode 100644
index 0000000..beb1c8d
--- /dev/null
+++ b/lights/android.hardware.lights-qti.rc
@@ -0,0 +1,5 @@
+service vendor.light-qti /vendor/bin/hw/android.hardware.lights-service.qti
+    class hal
+    user system
+    group system
+    shutdown critical
diff --git a/lights/android.hardware.lights-qti.xml b/lights/android.hardware.lights-qti.xml
new file mode 100644
index 0000000..db604d6
--- /dev/null
+++ b/lights/android.hardware.lights-qti.xml
@@ -0,0 +1,6 @@
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.light</name>
+        <fqname>ILights/default</fqname>
+    </hal>
+</manifest>
diff --git a/lights/main.cpp b/lights/main.cpp
new file mode 100644
index 0000000..5bab50d
--- /dev/null
+++ b/lights/main.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using ::aidl::android::hardware::light::Lights;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+    std::shared_ptr<Lights> lights = ndk::SharedRefBase::make<Lights>();
+
+    const std::string instance = std::string() + Lights::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(lights->asBinder().get(), instance.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;  // should not reached
+}