Get bluetooth working in Linux kernel with mt7630e

##What you need to do:

1. Recompile btusb.c with the patch and generate the btusb.ko file (this is what you actually need).
2. Copy the btusb.ko file in /lib/modules/$(uname -r)/kernel/drivers/bluetooth
3. Restart bluetooth ##Steps:

###Get the kernel source code ready for the patch:

sudo service bluetooth stop #Stop the bluetooth
sudo apt-get install build-essential linux-headers-$(uname -r)
cd to your prefered build dir                  
apt-get source linux-image-$(uname -r)         # Get the kernel source code
sudo apt-get build-dep linux-image-$(uname -r) # Build kernel dependencies 
cd to the created source dir                   
cp "/boot/config-$(uname -r)" .config
cp "/usr/src/linux-headers-$(uname -r)/Module.symvers" .

##Apply the patch: Inside the linux kernel source this is where this file resides: drivers/bluetooth/btusb.c Open this file and apply the following patch (from sipertruk comment):

--- drivers/bluetooth/btusb.c	2015-08-30 20:34:09.000000000 +0200
+++ ../linux-4.2.0/drivers/bluetooth/btusb.c	2016-03-13 21:06:23.393727580 +0100
@@ -60,6 +60,7 @@
 #define BTUSB_QCA_ROME		0x8000
 #define BTUSB_BCM_APPLE		0x10000
 #define BTUSB_REALTEK		0x20000
+#define BTUSB_MEDIATEK		0x40000
 
 static const struct usb_device_id btusb_table[] = {
 	/* Generic Bluetooth USB device */
@@ -73,7 +74,7 @@
 	  .driver_info = BTUSB_BCM_APPLE },
 
 	/* MediaTek MT76x0E */
-	{ USB_DEVICE(0x0e8d, 0x763f) },
+	{ USB_DEVICE(0x0e8d, 0x763f), .driver_info = BTUSB_MEDIATEK },
 
 	/* Broadcom SoftSailing reporting vendor specific */
 	{ USB_DEVICE(0x0a5c, 0x21e1) },
@@ -2796,6 +2803,10 @@
 		set_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks);
 	}
 
+	if (id->driver_info & BTUSB_MEDIATEK) { 
+		set_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks);
+	}
+
 	if (id->driver_info & BTUSB_INTEL_BOOT)
 		set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);

Note:

#define BTUSB_MEDIATEK 0x40000 may defer flavour to flavour. If there is already an entry for 0x40000, then don't add it with the same value, and do not replace the existing #define with this one to get the same as the patch, instead change it to a value that is unique. For example, In xubuntu 16.04 LTS there already exists:

#define BTUSB_REALTEK		0x20000
#define BTUSB_BCM2045		0x40000
#define BTUSB_IFNUM_2		0x80000

Therefore, you should do:

#define BTUSB_REALTEK          0x20000
#define BTUSB_BCM2045          0x40000
#define BTUSB_IFNUM_2          0x80000
#define BTUSB_MEDIATEK         0x100000

And also remember that these values (0x80000, 0x100000) are not random.

It may be a bit difficult for you to understand what's going on with these values if you don't know about hex and binary and hex-binary conversion and how bitwise operation works in C. But I am going to show you a easy way how you can make this work correctly:

1. Remember the sequence 1,2,4,8
2. After 8 comes 1 but the the number increases

Examples,

1. For a sequence 0x40000, 0x80000 the next is 0x100000
2. For a sequence 0x00001, 0x00002, 0x00004, 0x00008 the next is 0x00010

###Finally build the module:

make prepare
make modules_prepare
make M=scripts/mod
make M=drivers/bluetooth/ modules
sudo cp drivers/bluetooth/btusb.ko /lib/modules/$(uname -r)/kernel/drivers/bluetooth
sudo service bluetooth start

This patch is bein discussed in https://github.com/neurobin/MT7630E/issues/6