How To Port Kernel a Driver

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 78ac481..925aa7b 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -144,6 +144,17 @@  config HID_ASUS
     - EeeBook X205TA
     - VivoBook E200HA
+config HID_ASUS_GAMING_NB_KBD
+    tristate "ASUS special macrokey device for Republic of Gamers laptop"
+    depends on HID
+    ---help---
+    Support for ASUS special macrokey devices on Republic of Gamers latops
+    that are not fully compliant with HID standard
+
+        Say Y if you want support for the non-compliant features of the Asus
+        Republic of Gamers laptop keyboards, e.g:
+        - Asus Notebook GL553VD/GL553VE/GL753VD/GL753VE
+
config HID_AUREAL
     tristate "Aureal"
     depends on HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index fc4b2aa..f15479a 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -26,6 +26,7 @@  obj-$(CONFIG_HID_ACRUX)        += hid-axff.o
obj-$(CONFIG_HID_APPLE)        += hid-apple.o
obj-$(CONFIG_HID_APPLEIR)    += hid-appleir.o
obj-$(CONFIG_HID_ASUS)        += hid-asus.o
+obj-$(CONFIG_HID_ASUS_GAMING_NB_KBD)    += hid-asus-rog.o
obj-$(CONFIG_HID_AUREAL)    += hid-aureal.o
obj-$(CONFIG_HID_BELKIN)    += hid-belkin.o
obj-$(CONFIG_HID_BETOP_FF)    += hid-betopff.o
diff --git a/drivers/hid/hid-asus-rog.c b/drivers/hid/hid-asus-rog.c
new file mode 100644
index 0000000..a33a693
--- /dev/null
+++ b/drivers/hid/hid-asus-rog.c
@@ -0,0 +1,80 @@
+/*
+ *  HID driver for some Asus Gaming model equipped with "special" macrokey
+ *  devices for hotkey handling
+ *
+ *  Currently supported devices are:
+ *    ASUS laptops for "Republic of Gamers"
+ *    GL553VD/GL553VE
+ *    GL753VD/GL753VE
+ *
+ *  Copyright (c) 2016 Chris Chiu <[email protected]>
+ *
+ *  This module based on hid-gyration
+ *
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#define asus_rog_map_key_clear(c)    hid_map_usage_clear(hi, usage, bit, \
+                        max, EV_KEY, (c))
+static int asus_rog_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+        struct hid_field *field, struct hid_usage *usage,
+        unsigned long **bit, int *max)
+{
+    if ((usage->hid & HID_USAGE_PAGE) != HID_UP_ASUS_ROG_HOTKEY)
+        return 0;
+
+    set_bit(EV_REP, hi->input->evbit);
+    switch (usage->hid & HID_USAGE) {
+    /* Reported on ASUS Gaming model (Republic of Gamers) keyboards */
+    case 0x6c: asus_rog_map_key_clear(KEY_SLEEP);        break;
+    case 0x88: asus_rog_map_key_clear(KEY_WLAN);        break;
+    case 0xc5: asus_rog_map_key_clear(KEY_KBDILLUMDOWN);    break;
+    case 0xc4: asus_rog_map_key_clear(KEY_KBDILLUMUP);    break;
+    case 0x10: asus_rog_map_key_clear(KEY_BRIGHTNESSDOWN);    break;
+    case 0x20: asus_rog_map_key_clear(KEY_BRIGHTNESSUP);    break;
+    case 0x35: asus_rog_map_key_clear(KEY_DISPLAY_OFF);    break;
+    // KEY_F21 is for ASUS touchpad toggle
+    case 0x6b: asus_rog_map_key_clear(KEY_F21);             break;
+    case 0x82: asus_rog_map_key_clear(KEY_CAMERA);          break;
+    case 0xb5: asus_rog_map_key_clear(KEY_CALC);            break;
+    // KEY_PROG1 for ROG key
+    case 0x38: asus_rog_map_key_clear(KEY_PROG1);           break;
+    // KEY_PROG2 for Fn+C ASUS Splendid
+    case 0xba: asus_rog_map_key_clear(KEY_PROG2);           break;
+    // KEY_PROG3 for Fn+Space Power4Gear Hybrid, may not be present
+    case 0x5c: asus_rog_map_key_clear(KEY_PROG3);           break;
+
+    default:
+        return 0;
+    }
+    return 1;
+}
+
+static const struct hid_device_id asus_rog_devices[] = {
+    { HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_ROG_MACROKEY1) },
+    { HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_ROG_MACROKEY2) },
+    { }
+};
+MODULE_DEVICE_TABLE(hid, asus_rog_devices);
+
+static struct hid_driver asus_rog_driver = {
+    .name = "asus-rog",
+    .id_table = asus_rog_devices,
+    .input_mapping = asus_rog_input_mapping,
+};
+module_hid_driver(asus_rog_driver);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 4ed9a4f..5c60aee 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -168,6 +168,8 @@
#define USB_DEVICE_ID_ASUSTEK_LCM    0x1726
#define USB_DEVICE_ID_ASUSTEK_LCM2    0x175b
#define USB_DEVICE_ID_ASUSTEK_NOTEBOOK_KEYBOARD    0x8585
+#define USB_DEVICE_ID_ASUSTEK_ROG_MACROKEY1    0x1854
+#define USB_DEVICE_ID_ASUSTEK_ROG_MACROKEY2    0x1837
#define USB_VENDOR_ID_ATEN        0x0557
#define USB_DEVICE_ID_ATEN_UC100KM    0x2004
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 75b66ec..a6ccadb 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -170,6 +170,7 @@  struct hid_item {
#define HID_UP_LOGIVENDOR    0xffbc0000
#define HID_UP_LOGIVENDOR2   0xff090000
#define HID_UP_LOGIVENDOR3   0xff430000
+#define HID_UP_ASUS_ROG_HOTKEY    0xff310000
#define HID_UP_LNVENDOR        0xffa00000
#define HID_UP_SENSOR        0x00200000