Enable backlight adjustment for replicant 11

Without that patch, with the GT-I9300 and the GT-I9305
users don't have the ability to adjust the backlight
levels.

The liblight HAL was taken from device/google/wahoo,
and renamed.

Signed-off-by: belgin <belginstirbu@hotmail.com>
GNUtoo: squashed commits, modified the commit message(s)
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

8 files changed, 172 insertions, 4 deletions

diff --git a/BoardConfigCommon.mk b/BoardConfigCommon.mk
index 0a5d355..ee8b462 100644
--- a/BoardConfigCommon.mk
+++ b/BoardConfigCommon.mk
@@ -62,5 +62,6 @@ DEVICE_MANIFEST_FILE := device/samsung/midas-common/manifest.xml
 PRODUCT_FULL_TREBLE_OVERRIDE := true
 BUILD_BROKEN_USES_BUILD_HOST_STATIC_LIBRARY := true
 BOARD_VENDOR_SEPOLICY_DIRS += device/samsung/midas-common/sepolicy
+TARGET_KERNEL_CLANG_COMPILE := true
 
 -include vendor/replicant/config/BoardConfigReplicant.mk
diff --git a/lights/Android.bp b/lights/Android.bp
new file mode 100644
index 0000000..0e0bf18
--- /dev/null
+++ b/lights/Android.bp
@@ -0,0 +1,14 @@
+cc_binary {
+    name: "lights-midas",
+    relative_install_path: "hw",
+    init_rc: ["lights.rc"],
+    vintf_fragments: ["lights.xml"],
+    vendor: true,
+    shared_libs: [
+        "libbase",
+        "libbinder_ndk",
+        "android.hardware.light-ndk_platform",
+    ],
+
+    srcs: ["lights.cpp"],
+}
diff --git a/lights/lights.cpp b/lights/lights.cpp
new file mode 100644
index 0000000..354fc57
--- /dev/null
+++ b/lights/lights.cpp
@@ -0,0 +1,139 @@
+/*
+ * 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 <array>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+#include <aidl/android/hardware/light/BnLights.h>
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using ::aidl::android::hardware::light::BnLights;
+using ::aidl::android::hardware::light::HwLight;
+using ::aidl::android::hardware::light::HwLightState;
+using ::aidl::android::hardware::light::ILights;
+using ::aidl::android::hardware::light::LightType;
+using ::ndk::ScopedAStatus;
+using ::ndk::SharedRefBase;
+
+char const* const BACKLIGHT_FILE = "/sys/class/backlight/panel/brightness";
+
+static int sys_write_int(int fd, int value) {
+    char buffer[16];
+    size_t bytes;
+    ssize_t amount;
+
+    bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);
+    if (bytes >= sizeof(buffer)) return -EINVAL;
+    amount = write(fd, buffer, bytes);
+    return amount == -1 ? -errno : 0;
+}
+
+class Lights : public BnLights {
+  private:
+    std::vector<HwLight> availableLights;
+
+    void addLight(LightType const type, int const ordinal) {
+        HwLight light{};
+        light.id = availableLights.size();
+        light.type = type;
+        light.ordinal = ordinal;
+        availableLights.emplace_back(light);
+    }
+
+    int rgbToBrightness(int color)
+    {
+	    color = color & 0x00ffffff;
+	    return ((77*((color>>16)&0x00ff))
+			    + (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
+    }
+
+    void writeLed(const char* path, int color) {
+        int fd = open(path, O_WRONLY);
+        if (fd < 0) {
+            LOG(ERROR) << "COULD NOT OPEN LED_DEVICE " << path;
+            return;
+        }
+
+        sys_write_int(fd, color);
+        close(fd);
+    }
+
+  public:
+    Lights() : BnLights() {
+        addLight(LightType::BACKLIGHT, 0);
+    }
+
+    ScopedAStatus setLightState(int id, const HwLightState& state) override {
+        if (!(0 <= id && id < availableLights.size())) {
+            LOG(ERROR) << "Light id " << (int32_t)id << " does not exist.";
+            return ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+        }
+
+        int const color = rgbToBrightness(state.color);
+        HwLight const& light = availableLights[id];
+
+        int ret = 0;
+
+        switch (light.type) {
+            case LightType::BACKLIGHT:
+                writeLed(BACKLIGHT_FILE, color/255.f * 24);
+                break;
+        }
+
+        if (ret == 0) {
+            return ScopedAStatus::ok();
+        } else {
+            return ScopedAStatus::fromServiceSpecificError(ret);
+        }
+    }
+
+    ScopedAStatus getLights(std::vector<HwLight>* lights) override {
+        for (auto i = availableLights.begin(); i != availableLights.end(); i++) {
+            lights->push_back(*i);
+        }
+        return ScopedAStatus::ok();
+    }
+};
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+
+    std::shared_ptr<Lights> light = SharedRefBase::make<Lights>();
+
+    const std::string instance = std::string() + ILights::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(light->asBinder().get(), instance.c_str());
+
+    if (status != STATUS_OK) {
+        LOG(ERROR) << "Could not register" << instance;
+        // should abort, but don't want crash loop for local testing
+    }
+
+    ABinderProcess_joinThreadPool();
+
+    return 1;  // should not reach
+}
diff --git a/lights/lights.rc b/lights/lights.rc
new file mode 100644
index 0000000..7fdd4e3
--- /dev/null
+++ b/lights/lights.rc
@@ -0,0 +1,5 @@
+service vendor.lights-midas  /vendor/bin/hw/lights-midas
+    class hal
+    user system
+    group system
+    shutdown critical
diff --git a/lights/lights.xml b/lights/lights.xml
new file mode 100644
index 0000000..db604d6
--- /dev/null
+++ b/lights/lights.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/midas.mk b/midas.mk
index 4f9bac9..971e640 100644
--- a/midas.mk
+++ b/midas.mk
@@ -134,8 +134,7 @@ PRODUCT_COPY_FILES += $(LOCAL_PATH)/resize2fs_partitions.sh:system/bin/resize2fs
 # Lights #
 ##########
 
-PRODUCT_PACKAGES += \
-    android.hardware.light@2.0-service.samsung \
+PRODUCT_PACKAGES += lights-midas
 
 ##########
 # Memory #
@@ -144,7 +143,7 @@ PRODUCT_PACKAGES += \
 # HAL packages
 PRODUCT_PACKAGES += \
     android.hidl.memory@1.0-impl \
-    android.hidl.memory@1.0-service \
+    android.hidl.memory@1.0-service
 
 #########
 # Power #
@@ -152,7 +151,7 @@ PRODUCT_PACKAGES += \
 
 # HAL packages
 PRODUCT_PACKAGES += \
-	android.hardware.power-service.example \
+    android.hardware.power-service.example \
 
 ############
 # Security #
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index 35d19da..c156bd4 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -1 +1,3 @@
 /(vendor|system/vendor)/bin/hw/android\.hardware\.gatekeeper@1\.0-service\.software u:object_r:hal_gatekeeper_default_exec:s0
+
+/(vendor|system/vendor)/bin/hw/lights-midas u:object_r:hal_light_default_exec:s0
diff --git a/sepolicy/hal_light_default.te b/sepolicy/hal_light_default.te
new file mode 100644
index 0000000..20ee2e2
--- /dev/null
+++ b/sepolicy/hal_light_default.te
@@ -0,0 +1,2 @@
+#============= hal_light_default ==============
+allow hal_light_default sysfs:file { open write };