wayne: Convert light HAL into a HIDL service

Signed-off-by: dev-harsh1998 <harshit.india@linaro.org>

12 files changed, 280 insertions, 609 deletions

diff --git a/BoardConfig.mk b/BoardConfig.mk
index 6426007..ff2bccf 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -191,9 +191,6 @@ TARGET_PLATFORM_DEVICE_BASE := /devices/soc/
 # Keystore
 TARGET_PROVIDES_KEYMASTER := true
 
-# Lights
-TARGET_PROVIDES_LIBLIGHT := true
-
 # Partitions
 BOARD_FLASH_BLOCK_SIZE := 262144
 BOARD_BOOTIMAGE_PARTITION_SIZE := 67108864
diff --git a/device.mk b/device.mk
index 83a0148..9044756 100644
--- a/device.mk
+++ b/device.mk
@@ -293,11 +293,7 @@ PRODUCT_COPY_FILES += \
 
 # Lights
 PRODUCT_PACKAGES += \
-    lights.sdm660
-
-PRODUCT_PACKAGES += \
-    android.hardware.light@2.0-impl \
-    android.hardware.light@2.0-service
+    android.hardware.light@2.0-service.xiaomi_wayne
 
 # LiveDisplay native
 PRODUCT_PACKAGES += \
diff --git a/liblight/Android.mk b/liblight/Android.mk
deleted file mode 100644
index 2f2e1ca..0000000
--- a/liblight/Android.mk
+++ /dev/null
@@ -1,32 +0,0 @@
-# Copyright (C) 2008 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.
-
-LOCAL_PATH:= $(call my-dir)
-# HAL module implemenation stored in
-# hw/<COPYPIX_HARDWARE_MODULE_ID>.<ro.board.platform>.so
-include $(CLEAR_VARS)
-
-LOCAL_C_INCLUDES += $(TARGET_OUT_HEADERS)/common/inc
-LOCAL_C_INCLUDES += $(TARGET_OUT_HEADERS)/qdcm/inc
-
-LOCAL_SRC_FILES := lights.c lights_prv.cpp
-LOCAL_MODULE_RELATIVE_PATH := hw
-LOCAL_SHARED_LIBRARIES := liblog libcutils libsdm-disp-vndapis
-LOCAL_CFLAGS := -DLOG_TAG=\"qdlights\"
-LOCAL_CLANG  := true
-LOCAL_MODULE := lights.$(TARGET_BOARD_PLATFORM)
-LOCAL_MODULE_TAGS := optional
-LOCAL_VENDOR_MODULE := true
-
-include $(BUILD_SHARED_LIBRARY)
diff --git a/liblight/disp_color_apis.h b/liblight/disp_color_apis.h
deleted file mode 100644
index 07acb9e..0000000
--- a/liblight/disp_color_apis.h
+++ /dev/null
@@ -1,59 +0,0 @@
-#ifndef __DISP_COLOR_APIS_H__
-#define __DISP_COLOR_APIS_H__
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stdlib.h>
-#include <sys/types.h>
-#include <cutils/log.h>
-
-typedef uint64_t DISPAPI_HANDLE;
-
-
-/*=========================================================================
-FUNCTION
-  disp_api_init()
-
-DESCRIPTION
-  This API initializes the display API library.
-
-  This function must be called before calling any display APIs.
-  The function returns a context handle that must be used on all subsequent
-  calls.
-
-  hctx  -- returns context handle on a successful call
-  flags -- Reserved
-
-RETURN VALUE
-  ZERO (SUCCESS)- success.
-  Negative Value - error\failure
-=========================================================================*/
-
-int32_t disp_api_init(DISPAPI_HANDLE *hctx, uint32_t flags);
-
-/*=========================================================================
-FUNCTION
-  disp_api_set_panel_brightness_level_ext()
-
-DESCRIPTION
-  This API adjusts the backlight brightness.
-
-  hctx     -- Context handle.
-  disp_id  -- Display ID type
-  level -- Color balance adjustement, the larger the value the warmer the color
-  flags    -- Reserved
-
-RETURN VALUE
-  ZERO (SUCCESS)- success.
-  Negative Value - error\failure
-=========================================================================*/
-int32_t disp_api_set_panel_brightness_level_ext(DISPAPI_HANDLE hctx, uint32_t disp_id, int32_t level,
-                                          uint32_t flags);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif  // __DISP_COLOR_APIS_H__
diff --git a/liblight/lights.c b/liblight/lights.c
deleted file mode 100644
index 0e36b4b..0000000
--- a/liblight/lights.c
+++ /dev/null
@@ -1,413 +0,0 @@
-/*
- * Copyright (C) 2014, 2017 The  Linux Foundation. All rights reserved.
- * Not a contribution
- * Copyright (C) 2008 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.
- */
-
-
-// #define LOG_NDEBUG 0
-
-#include <cutils/log.h>
-#include <cutils/properties.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <pthread.h>
-
-#include <sys/ioctl.h>
-#include <sys/types.h>
-
-#include <hardware/lights.h>
-#include "lights_prv.h"
-
-#ifndef DEFAULT_LOW_PERSISTENCE_MODE_BRIGHTNESS
-#define DEFAULT_LOW_PERSISTENCE_MODE_BRIGHTNESS 0x80
-#endif
-
-/******************************************************************************/
-
-static pthread_once_t g_init = PTHREAD_ONCE_INIT;
-static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
-static struct light_state_t g_notification;
-static struct light_state_t g_battery;
-static int g_last_backlight_mode = BRIGHTNESS_MODE_USER;
-static int g_attention = 0;
-static int g_brightness_max = 0;
-
-char const*const RED_LED_FILE
-        = "/sys/class/leds/red/brightness";
-
-char const*const GREEN_LED_FILE
-        = "/sys/class/leds/green/brightness";
-
-char const*const BLUE_LED_FILE
-        = "/sys/class/leds/blue/brightness";
-
-char const*const LCD_FILE
-        = "/sys/class/leds/lcd-backlight/brightness";
-
-char const*const LCD_FILE2
-        = "/sys/class/backlight/panel0-backlight/brightness";
-
-char const*const BUTTON_FILE
-        = "/sys/class/leds/button-backlight/brightness";
-
-char const*const RED_BLINK_FILE
-        = "/sys/class/leds/red/blink";
-
-char const*const GREEN_BLINK_FILE
-        = "/sys/class/leds/green/blink";
-
-char const*const BLUE_BLINK_FILE
-        = "/sys/class/leds/blue/blink";
-
-char const*const PERSISTENCE_FILE
-        = "/sys/class/graphics/fb0/msm_fb_persist_mode";
-
-/**
- * device methods
- */
-
-void init_globals(void)
-{
-    // init the mutex
-    pthread_mutex_init(&g_lock, NULL);
-}
-
-static int
-write_int(char const* path, int value)
-{
-    int fd;
-    static int already_warned = 0;
-
-    fd = open(path, O_RDWR);
-    if (fd >= 0) {
-        char buffer[20];
-        int bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);
-        ssize_t amt = write(fd, buffer, (size_t)bytes);
-        close(fd);
-        return amt == -1 ? -errno : 0;
-    } else {
-        if (already_warned == 0) {
-            ALOGE("write_int failed to open %s\n", path);
-            already_warned = 1;
-        }
-        return -errno;
-    }
-}
-
-static int
-is_lit(struct light_state_t const* state)
-{
-    return state->color & 0x00ffffff;
-}
-
-static int
-rgb_to_brightness(struct light_state_t const* state)
-{
-    int color = state->color & 0x00ffffff;
-    return ((77*((color>>16)&0x00ff))
-            + (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
-}
-
-static int
-set_light_backlight(struct light_device_t* dev,
-        struct light_state_t const* state)
-{
-    int err = 0;
-    int brightness = rgb_to_brightness(state);
-    unsigned int lpEnabled =
-        state->brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE;
-    if(!dev) {
-        return -1;
-    }
-
-    pthread_mutex_lock(&g_lock);
-    // Toggle low persistence mode state
-    if ((g_last_backlight_mode != state->brightnessMode && lpEnabled) ||
-        (!lpEnabled &&
-         g_last_backlight_mode == BRIGHTNESS_MODE_LOW_PERSISTENCE)) {
-        if ((err = write_int(PERSISTENCE_FILE, lpEnabled)) != 0) {
-            ALOGE("%s: Failed to write to %s: %s\n", __FUNCTION__,
-                   PERSISTENCE_FILE, strerror(errno));
-        }
-        if (lpEnabled != 0) {
-            brightness = DEFAULT_LOW_PERSISTENCE_MODE_BRIGHTNESS;
-        }
-    }
-
-    g_last_backlight_mode = state->brightnessMode;
-
-    brightness *= brightness;
-
-    if (!err) {
-        if (!access(LCD_FILE, F_OK)) {
-            err = write_int(LCD_FILE, brightness);
-        } else {
-            err = write_int(LCD_FILE2, brightness);
-        }
-    }
-
-    pthread_mutex_unlock(&g_lock);
-    return err;
-}
-
-static int
-set_light_backlight_ext(struct light_device_t* dev,
-        struct light_state_t const* state)
-{
-    int err = 0;
-
-    if(!dev) {
-        return -1;
-    }
-
-    int brightness = state->color & 0x00ffffff;
-    pthread_mutex_lock(&g_lock);
-
-    if (brightness >= 0 && brightness <= g_brightness_max) {
-        set_brightness_ext_level(brightness);
-    }
-
-    pthread_mutex_unlock(&g_lock);
-
-    return err;
-}
-
-static int
-set_speaker_light_locked(struct light_device_t* dev,
-        struct light_state_t const* state)
-{
-    int red, green, blue;
-    int blink;
-    int onMS, offMS;
-    unsigned int colorRGB;
-
-    if(!dev) {
-        return -1;
-    }
-
-    switch (state->flashMode) {
-        case LIGHT_FLASH_TIMED:
-            onMS = state->flashOnMS;
-            offMS = state->flashOffMS;
-            break;
-        case LIGHT_FLASH_NONE:
-        default:
-            onMS = 0;
-            offMS = 0;
-            break;
-    }
-
-    colorRGB = state->color;
-
-#if 0
-    ALOGD("set_speaker_light_locked mode %d, colorRGB=%08X, onMS=%d, offMS=%d\n",
-            state->flashMode, colorRGB, onMS, offMS);
-#endif
-
-    red = (colorRGB >> 16) & 0xFF;
-    green = (colorRGB >> 8) & 0xFF;
-    blue = colorRGB & 0xFF;
-
-    if (onMS > 0 && offMS > 0) {
-        /*
-         * if ON time == OFF time
-         *   use blink mode 2
-         * else
-         *   use blink mode 1
-         */
-        if (onMS == offMS)
-            blink = 2;
-        else
-            blink = 1;
-    } else {
-        blink = 0;
-    }
-
-    if (blink) {
-        if (red) {
-            if (write_int(RED_BLINK_FILE, blink))
-                write_int(RED_LED_FILE, 0);
-    }
-        if (green) {
-            if (write_int(GREEN_BLINK_FILE, blink))
-                write_int(GREEN_LED_FILE, 0);
-    }
-        if (blue) {
-            if (write_int(BLUE_BLINK_FILE, blink))
-                write_int(BLUE_LED_FILE, 0);
-    }
-    } else {
-        write_int(RED_LED_FILE, red);
-        write_int(GREEN_LED_FILE, green);
-        write_int(BLUE_LED_FILE, blue);
-    }
-
-    return 0;
-}
-
-static void
-handle_speaker_battery_locked(struct light_device_t* dev)
-{
-    if (is_lit(&g_battery)) {
-        set_speaker_light_locked(dev, &g_battery);
-    } else {
-        set_speaker_light_locked(dev, &g_notification);
-    }
-}
-
-static int
-set_light_battery(struct light_device_t* dev,
-        struct light_state_t const* state)
-{
-    pthread_mutex_lock(&g_lock);
-    g_battery = *state;
-    handle_speaker_battery_locked(dev);
-    pthread_mutex_unlock(&g_lock);
-    return 0;
-}
-
-static int
-set_light_notifications(struct light_device_t* dev,
-        struct light_state_t const* state)
-{
-    pthread_mutex_lock(&g_lock);
-    g_notification = *state;
-    handle_speaker_battery_locked(dev);
-    pthread_mutex_unlock(&g_lock);
-    return 0;
-}
-
-static int
-set_light_attention(struct light_device_t* dev,
-        struct light_state_t const* state)
-{
-    pthread_mutex_lock(&g_lock);
-    if (state->flashMode == LIGHT_FLASH_HARDWARE) {
-        g_attention = state->flashOnMS;
-    } else if (state->flashMode == LIGHT_FLASH_NONE) {
-        g_attention = 0;
-    }
-    handle_speaker_battery_locked(dev);
-    pthread_mutex_unlock(&g_lock);
-    return 0;
-}
-
-static int
-set_light_buttons(struct light_device_t* dev,
-        struct light_state_t const* state)
-{
-    int err = 0;
-    if(!dev) {
-        return -1;
-    }
-    pthread_mutex_lock(&g_lock);
-    err = write_int(BUTTON_FILE, state->color & 0xFF);
-    pthread_mutex_unlock(&g_lock);
-    return err;
-}
-
-/** Close the lights device */
-static int
-close_lights(struct light_device_t *dev)
-{
-    if (dev) {
-        free(dev);
-    }
-    return 0;
-}
-
-
-/******************************************************************************/
-
-/**
- * module methods
- */
-
-/** Open a new instance of a lights device using name */
-static int open_lights(const struct hw_module_t* module, char const* name,
-        struct hw_device_t** device)
-{
-    int (*set_light)(struct light_device_t* dev,
-            struct light_state_t const* state);
-
-    if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) {
-        char property[PROPERTY_VALUE_MAX];
-        property_get("persist.extend.brightness", property, "0");
-
-        if(!(strncmp(property, "1", PROPERTY_VALUE_MAX)) ||
-           !(strncmp(property, "true", PROPERTY_VALUE_MAX))) {
-            property_get("persist.display.max_brightness", property, "255");
-            g_brightness_max = atoi(property);
-            set_brightness_ext_init();
-            set_light = set_light_backlight_ext;
-        } else
-            set_light = set_light_backlight;
-    } else if (0 == strcmp(LIGHT_ID_BATTERY, name))
-        set_light = set_light_battery;
-    else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
-        set_light = set_light_notifications;
-    else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
-        if (!access(BUTTON_FILE, F_OK)) {
-          // enable light button when the file is present
-          set_light = set_light_buttons;
-        } else {
-          return -EINVAL;
-        }
-    }
-    else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
-        set_light = set_light_attention;
-    else
-        return -EINVAL;
-
-    pthread_once(&g_init, init_globals);
-
-    struct light_device_t *dev = malloc(sizeof(struct light_device_t));
-
-    if(!dev)
-        return -ENOMEM;
-
-    memset(dev, 0, sizeof(*dev));
-
-    dev->common.tag = HARDWARE_DEVICE_TAG;
-    dev->common.version = LIGHTS_DEVICE_API_VERSION_2_0;
-    dev->common.module = (struct hw_module_t*)module;
-    dev->common.close = (int (*)(struct hw_device_t*))close_lights;
-    dev->set_light = set_light;
-
-    *device = (struct hw_device_t*)dev;
-    return 0;
-}
-
-static struct hw_module_methods_t lights_module_methods = {
-    .open =  open_lights,
-};
-
-/*
- * The lights Module
- */
-struct hw_module_t HAL_MODULE_INFO_SYM = {
-    .tag = HARDWARE_MODULE_TAG,
-    .version_major = 1,
-    .version_minor = 0,
-    .id = LIGHTS_HARDWARE_MODULE_ID,
-    .name = "lights Module",
-    .author = "Google, Inc.",
-    .methods = &lights_module_methods,
-};
diff --git a/liblight/lights_prv.cpp b/liblight/lights_prv.cpp
deleted file mode 100644
index f916ed2..0000000
--- a/liblight/lights_prv.cpp
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Copyright (c) 2017, The Linux Foundation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- *       copyright notice, this list of conditions and the following
- *       disclaimer in the documentation and/or other materials provided
- *       with the distribution.
- *     * Neither the name of The Linux Foundation nor the names of its
- *       contributors may be used to endorse or promote products derived
- *       from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
- * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
-
-#include <hardware/hwcomposer_defs.h>
-#include "disp_color_apis.h"
-#include "lights_prv.h"
-
-/******************************************************************************/
-static DISPAPI_HANDLE g_ctx;
-
-/**
- * device methods
- */
-
-void set_brightness_ext_init(void)
-{
-   disp_api_init((DISPAPI_HANDLE*) &g_ctx, 0);
-}
-
-int set_brightness_ext_level(int level)
-{
-    int err = disp_api_set_panel_brightness_level_ext(g_ctx, HWC_DISPLAY_PRIMARY,
-                                                 level, 0);
-
-    return err;
-}
diff --git a/liblight/lights_prv.h b/liblight/lights_prv.h
deleted file mode 100644
index e0ec736..0000000
--- a/liblight/lights_prv.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * Copyright (c) 2017, The Linux Foundation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- *       copyright notice, this list of conditions and the following
- *       disclaimer in the documentation and/or other materials provided
- *       with the distribution.
- *     * Neither the name of The Linux Foundation nor the names of its
- *       contributors may be used to endorse or promote products derived
- *       from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
- * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef LIGHTS_PRV_H
-#define LIGHTS_PRV_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-extern void set_brightness_ext_init(void);
-extern int set_brightness_ext_level(int level);
-
-#ifdef __cplusplus
-}
-#endif
-#endif
diff --git a/light/Android.bp b/light/Android.bp
new file mode 100644
index 0000000..a60fcf8
--- /dev/null
+++ b/light/Android.bp
@@ -0,0 +1,32 @@
+//
+// Copyright (C) 2018 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.
+
+cc_binary {
+    defaults: ["hidl_defaults"],
+    name: "android.hardware.light@2.0-service.xiaomi_wayne",
+    init_rc: ["android.hardware.light@2.0-service.xiaomi_wayne.rc"],
+    srcs: ["service.cpp", "Light.cpp"],
+    shared_libs: [
+	"libhardware",
+	"libhidlbase",
+	"libhidltransport",
+	"liblog",
+	"libhwbinder",
+	"libutils",
+	"android.hardware.light@2.0",
+    ],
+    relative_install_path : "hw",
+    proprietary: true,
+}
diff --git a/light/Light.cpp b/light/Light.cpp
new file mode 100644
index 0000000..c170ae2
--- /dev/null
+++ b/light/Light.cpp
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+//Author := dev_harsh1998, Isaac Chen
+
+#define LOG_TAG "android.hardware.light@2.0-service.xiaomi_wayne"
+
+#include <log/log.h>
+#include <fstream>
+#include "Light.h"
+
+namespace android {
+namespace hardware {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+#define LEDS                       "/sys/class/leds/"
+#define LCD_LED                    LEDS "lcd-backlight/"
+#define BRIGHTNESS                 "brightness"
+#define RED                        LEDS "red/"
+#define BLINK                      "blink"
+
+/*
+ * Write value to path and close file.
+ */
+static void set(std::string path, std::string value) {
+    std::ofstream file(path);
+    file << value;
+}
+
+static void set(std::string path, int value) {
+    set(path, std::to_string(value));
+}
+
+static void handleWayneBacklight(const LightState& state) {
+    uint32_t brightness = state.color & 0xFF;
+    set(LCD_LED BRIGHTNESS, brightness);
+}
+
+static void handleWayneNotification(const LightState& state) {
+    uint32_t redBrightness, brightness, blink;
+
+    /*
+     * Extract brightness from RGB.
+     */
+    redBrightness   = (state.color >> 16) & 0xFF;
+    brightness      = (state.color >> 24) & 0xFF;
+
+    /*
+     * Scale RGB brightness if the Alpha brightness is not 0xFF.
+     */
+    if (brightness != 0xFF) {
+        redBrightness   = (redBrightness * brightness) / 0xFF;
+    }
+
+    /* Turn off the leds (initially) */
+    set(RED BRIGHTNESS, 0);
+    set(RED BLINK, 0);
+
+    if (state.flashMode == Flash::TIMED) {
+        uint32_t onMS  = state.flashOnMs;
+        uint32_t offMS = state.flashOffMs;
+
+        if (onMS > 0 && offMS > 0) {
+            blink = 1;
+        } else {
+            blink = 0;
+        }
+
+        /* Red(Actually White) */
+        set(RED BLINK, blink);
+        set(RED BRIGHTNESS, 0);
+
+    } else {
+        set(RED BRIGHTNESS, redBrightness);
+    }
+}
+
+static std::map<Type, std::function<void(const LightState&)>> lights = {
+    {Type::BACKLIGHT, handleWayneBacklight},
+    {Type::NOTIFICATIONS, handleWayneNotification},
+    {Type::BATTERY, handleWayneNotification},
+    {Type::ATTENTION, handleWayneNotification},
+};
+
+Light::Light() {}
+
+Return<Status> Light::setLight(Type type, const LightState& state) {
+    auto it = lights.find(type);
+
+    if (it == lights.end()) {
+        return Status::LIGHT_NOT_SUPPORTED;
+    }
+
+    /*
+     * Lock global mutex until light state is updated.
+     */
+
+    std::lock_guard<std::mutex> lock(globalLock);
+    it->second(state);
+    return Status::SUCCESS;
+}
+
+Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
+    std::vector<Type> types;
+
+    for (auto const& light : lights) types.push_back(light.first);
+
+    _hidl_cb(types);
+
+    return Void();
+}
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace hardware
+}  // namespace android
diff --git a/light/Light.h b/light/Light.h
new file mode 100644
index 0000000..311b7de
--- /dev/null
+++ b/light/Light.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2017 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 <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:
+        std::mutex globalLock;
+};
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H
diff --git a/light/android.hardware.light@2.0-service.xiaomi_wayne.rc b/light/android.hardware.light@2.0-service.xiaomi_wayne.rc
new file mode 100644
index 0000000..0ebe09b
--- /dev/null
+++ b/light/android.hardware.light@2.0-service.xiaomi_wayne.rc
@@ -0,0 +1,9 @@
+on boot
+    # Notification LED
+    chown system system /sys/class/leds/red/blink
+    chown system system /sys/class/leds/red/brightness
+ 
+service light-hal-2-0 /vendor/bin/hw/android.hardware.light@2.0-service.xiaomi_wayne
+    class hal
+    user system
+    group system
diff --git a/light/service.cpp b/light/service.cpp
new file mode 100644
index 0000000..abefdc0
--- /dev/null
+++ b/light/service.cpp
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018 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.
+ */
+
+#define LOG_TAG "android.hardware.light@2.0-service.xiaomi_wayne"
+
+#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::sp;
+using android::status_t;
+
+int main() {
+    android::sp<ILight> service = new Light();
+
+    configureRpcThreadpool(1, true);
+
+    status_t status = service->registerAsService();
+    if (status != OK) {
+        ALOGE("Cannot register Light HAL service.");
+        return 1;
+    }
+
+    ALOGI("Light HAL service ready.");
+
+    joinRpcThreadpool();
+
+    ALOGI("Light HAL service failed to join thread pool.");
+    return 1;
+}