sdm845-common: Build our own lights HAL

Change-Id: I0e0d2db5c109778b86ab54101b70f0d3856195cb

Android.bp

@@ -0,0 +1,3 @@
+subdirs = [
+    "lights"
+]

common.mk

@@ -45,6 +45,10 @@ PRODUCT_PACKAGES += \
 PRODUCT_PACKAGES += \
     libvulkan
 
+# Lights
+PRODUCT_PACKAGES += \
+    android.hardware.light@2.0-service.oneplus_sdm845
+
 # Net
 PRODUCT_PACKAGES += \
     netutils-wrapper-1.0

lights/Android.bp

@@ -0,0 +1,32 @@
+//
+// Copyright (C) 2018 The LineageOS 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.
+
+cc_binary {
+    relative_install_path: "hw",
+    defaults: ["hidl_defaults"],
+    name: "android.hardware.light@2.0-service.oneplus_sdm845",
+    init_rc: ["android.hardware.light@2.0-service.oneplus_sdm845.rc"],
+    srcs: ["service.cpp", "Light.cpp"],
+    shared_libs: [
+        "libbase",
+        "libhardware",
+        "libhidlbase",
+        "libhidltransport",
+        "liblog",
+        "libhwbinder",
+        "libutils",
+        "android.hardware.light@2.0",
+    ],
+}

lights/Light.cpp

@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2014, 2017-2018 The  Linux Foundation. All rights reserved.
+ * Not a contribution
+ * Copyright (C) 2008 The Android Open Source Project
+ * Copyright (C) 2018 The LineageOS 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.
+ */
+
+#define LOG_TAG "LightsService"
+
+#include "Light.h"
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <fstream>
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+namespace android {
+namespace hardware {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+/*
+ * Write value to path and close file.
+ */
+template <typename T>
+static void set(const std::string& path, const T& value) {
+    std::ofstream file(path);
+    file << value;
+}
+
+template <typename T>
+static T get(const std::string& path, const T& def) {
+    std::ifstream file(path);
+    T result;
+
+    file >> result;
+    return file.fail() ? def : result;
+}
+
+static int rgbToBrightness(const LightState& state) {
+    int color = state.color & 0x00ffffff;
+    return ((77 * ((color >> 16) & 0x00ff))
+            + (150 * ((color >> 8) & 0x00ff))
+            + (29 * (color & 0x00ff))) >> 8;
+}
+
+Light::Light() {
+    mLights.emplace(Type::ATTENTION, std::bind(&Light::handleRgb, this, std::placeholders::_1, 0));
+    mLights.emplace(Type::BACKLIGHT, std::bind(&Light::handleBacklight, this, std::placeholders::_1));
+    mLights.emplace(Type::BATTERY, std::bind(&Light::handleRgb, this, std::placeholders::_1, 1));
+    mLights.emplace(Type::NOTIFICATIONS, std::bind(&Light::handleRgb, this, std::placeholders::_1, 2));
+}
+
+void Light::handleBacklight(const LightState& state) {
+    int maxBrightness = get("/sys/class/backlight/panel0-backlight/max_brightness", -1);
+    if (maxBrightness < 0) {
+        maxBrightness = 255;
+    }
+    int sentBrightness = rgbToBrightness(state);
+    int brightness = sentBrightness * maxBrightness / 255;
+    LOG(DEBUG) << "Writing backlight brightness " << brightness
+               << " (orig " << sentBrightness << ")";
+    set("/sys/class/backlight/panel0-backlight/brightness", brightness);
+}
+
+void Light::handleRgb(const LightState& state, size_t index) {
+    mLightStates.at(index) = state;
+
+    LightState stateToUse = mLightStates.front();
+    for (const auto& lightState : mLightStates) {
+        if (lightState.color & 0xffffff) {
+            stateToUse = lightState;
+            break;
+        }
+    }
+
+    std::map<std::string, int> colorValues;
+    colorValues["red"] = (stateToUse.color >> 16) & 0xff;
+    colorValues["green"] = (stateToUse.color >> 8) & 0xff;
+    colorValues["blue"] = stateToUse.color & 0xff;
+
+    int onMs = stateToUse.flashMode == Flash::TIMED ? stateToUse.flashOnMs : 0;
+    int offMs = stateToUse.flashMode == Flash::TIMED ? stateToUse.flashOffMs : 0;
+
+    static constexpr int kRampSize = 8;
+    static constexpr int kBrightnessRamp[] = { 0, 12, 25, 37, 50, 72, 85, 100 };
+    static constexpr int kRampStepDuration = 50;
+
+    auto makeLedPath = [](const std::string& led, const std::string& op) -> std::string {
+        return "/sys/class/leds/" + led + "/" + op;
+    };
+    auto getScaledDutyPercent = [](int brightness) -> std::string {
+        std::string output;
+        for (size_t i = 0; i < ARRAY_SIZE(kBrightnessRamp); i++) {
+            if (i != 0) {
+                output += ",";
+            }
+            output += std::to_string(kBrightnessRamp[i] * brightness / 255);
+        }
+        return output;
+    };
+
+    // Disable all blinking before starting
+    for (const auto& entry : colorValues) {
+        set(makeLedPath(entry.first, "blink"), 0);
+    }
+
+    if (onMs > 0 && offMs > 0) {
+        int pauseHi, stepDuration;
+        if (kRampStepDuration * kRampSize * 2 > onMs) {
+            stepDuration = onMs / 2 * kRampSize;
+            pauseHi = 0;
+        } else {
+            stepDuration = kRampStepDuration;
+            pauseHi = onMs - 2 * kRampSize * stepDuration;
+        }
+
+        for (const auto& entry : colorValues) {
+            set(makeLedPath(entry.first, "start_idx"), 0);
+            set(makeLedPath(entry.first, "duty_pcts"), getScaledDutyPercent(entry.second));
+            set(makeLedPath(entry.first, "pause_lo"), offMs);
+            // The led driver is configured to ramp up then ramp
+            // down the lut. This effectively doubles the ramp duration.
+            set(makeLedPath(entry.first, "pause_hi"), pauseHi);
+            set(makeLedPath(entry.first, "ramp_step_ms"), stepDuration);
+        }
+
+        // Start blinking
+        for (const auto& entry : colorValues) {
+            set(makeLedPath(entry.first, "blink"), entry.second);
+        }
+    } else {
+        for (const auto& entry : colorValues) {
+            set(makeLedPath(entry.first, "brightness"), entry.second);
+        }
+    }
+
+    LOG(DEBUG) << base::StringPrintf(
+        "handleRgb: mode=%d, color=%08X, onMs=%d, offMs=%d",
+        static_cast<std::underlying_type<Flash>::type>(stateToUse.flashMode), stateToUse.color,
+        onMs, offMs);
+}
+
+Return<Status> Light::setLight(Type type, const LightState& state) {
+    auto it = mLights.find(type);
+
+    if (it == mLights.end()) {
+        return Status::LIGHT_NOT_SUPPORTED;
+    }
+
+    /*
+     * Lock global mutex until light state is updated.
+     */
+    std::lock_guard<std::mutex> lock(mLock);
+
+    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();
+}
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace hardware
+}  // namespace android

lights/Light.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2018 The LineageOS 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.
+ */
+#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 <hardware/lights.h>
+#include <hidl/Status.h>
+#include <unordered_map>
+#include <mutex>
+
+namespace android {
+namespace hardware {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::light::V2_0::ILight;
+using ::android::hardware::light::V2_0::LightState;
+using ::android::hardware::light::V2_0::Status;
+using ::android::hardware::light::V2_0::Type;
+
+class Light : public ILight {
+  public:
+    Light();
+
+    Return<Status> setLight(Type type, const LightState& state) override;
+    Return<void> getSupportedTypes(getSupportedTypes_cb _hidl_cb) override;
+
+  private:
+    void handleBacklight(const LightState& state);
+    void handleRgb(const LightState& state, size_t index);
+
+    std::mutex mLock;
+    std::unordered_map<Type, std::function<void(const LightState&)>> mLights;
+    std::array<LightState, 3> mLightStates;
+};
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H

lights/android.hardware.light@2.0-service.oneplus_sdm845.rc

@@ -0,0 +1,4 @@
+service light-hal-2-0 /system/bin/hw/android.hardware.light@2.0-service.oneplus_sdm845
+    class hal
+    user system
+    group system

lights/service.cpp

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018 The LineageOS 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.
+ */
+
+#define LOG_TAG "android.hardware.light@2.0-service.oneplus_sdm845"
+
+#include <android-base/logging.h>
+#include <hidl/HidlTransportSupport.h>
+
+#include "Light.h"
+
+using android::hardware::configureRpcThreadpool;
+using android::hardware::joinRpcThreadpool;
+
+using android::hardware::light::V2_0::ILight;
+using android::hardware::light::V2_0::implementation::Light;
+
+using android::OK;
+using android::status_t;
+
+int main() {
+    android::sp<ILight> service = new Light();
+
+    configureRpcThreadpool(1, true);
+
+    status_t status = service->registerAsService();
+    if (status != OK) {
+        LOG(ERROR) << "Cannot register Light HAL service.";
+        return 1;
+    }
+
+    LOG(INFO) << "Light HAL service ready.";
+
+    joinRpcThreadpool();
+
+    LOG(ERROR) << "Light HAL service failed to join thread pool.";
+    return 1;
+}

sepolicy/private/file_contexts

@@ -5,3 +5,6 @@
 /op1(/.*)?               u:object_r:op1_file:s0
 /op2(/.*)?               u:object_r:op2_file:s0
 /persist(/.*)?           u:object_r:persist_file:s0
+
+# Lights
+/system/bin/hw/android\.hardware\.light@2\.0-service\.oneplus_sdm845    u:object_r:hal_light_sdm845_exec:s0

sepolicy/private/hal_light_sdm845.te

@@ -0,0 +1,7 @@
+type hal_light_sdm845, coredomain, domain;
+hal_server_domain(hal_light_sdm845, hal_light)
+
+type hal_light_sdm845_exec, exec_type, file_type;
+init_daemon_domain(hal_light_sdm845)
+
+allow hal_light_sdm845 sysfs_leds:file rw_file_perms;