bpatch

#!/bin/bash
##############################################################################################################
# This is a simple script to patch the bluetooth driver for Linux kernel
# to make it working with mt7630e driver
# 
# Author:
#       tobiasBora (https://github.com/tobiasBora)
# Code reviewed and improved by:
#       Md Jahidul Hamid (https://github.com/neurobin)
#
##############################################################################################################

p_name="$(basename "$BASH_SOURCE")"
p_version='1.0.1'
p_author='tobiasBora (https://github.com/tobiasBora)'
p_c_author='Md Jahidul Hamid (https://github.com/neurobin)'
p_bugt='https://github.com/neurobin/MT7630E/issues'
ver_info="
Name        : $p_name
Version     : $p_version
Author      : $p_author
Co-author   : $p_c_author
Bug report  : $p_bugt
"
help="
######################### bpatch ##############################
############# Script to patch bluetooth ################
###############################################################
# Usage:
#   $p_name [ -sd [sdir], -t, -v, -h]
#
# Options:
#   [ -sd [sdir] ]      : kernel soruce dir
#   [ -t, --test ]      : compile but do not install the patch
@   [ -u, --uninstall ] : uninstall the patch
#   [ -h, --help ]      : show help
#   [ -v, --version]    : show version info
#
# To apply the patch manually read the doc:
#   https://github.com/neurobin/MT7630E/wiki/Get-bluetooth-working-in-Linux-kernel--with-mt7630e
###############################################################
"
##############################################################################################################

set -e
BASEDIR="$(dirname "$BASH_SOURCE")"
cd "$BASEDIR"

chkroot(){
    if (( $EUID != 0 )); then
        printf "\n--- Sorry! Run with root privilege\n\n"
        exit 1
    fi
}

uninstall(){
    echo "*** Stoping Bluetooth..."
    service bluetooth stop ||
    systemctl stop bluetooth.service || true
    bdir="/lib/modules/$(uname -r)/kernel/drivers/bluetooth"
    if [ -f "$bdir/btusb.ko.old" ];
    then
       echo "*** Old installation found, saving current..."
       cp "$bdir/btusb.ko" "$bdir/btusb.ko.old2"
       echo "*** And restoring the old one..."
       cp "$bdir/btusb.ko.old" "$bdir/btusb.ko"
       #mv -f "$bdir/btusb.ko.old2" "$bdir/btusb.ko.old"
       echo "*** Done ! ***"
    else
       echo "... No older installation found (skipped)..."
    fi
    echo '*** trying to restart bluetooth ...'
    service bluetooth start ||
    systemctl restart bluetooth.service
}

###################### Arg parse #########################

sdir=""         # kernel source dir
skipd=false     # whether to download the source
test=false      # only compile the patch without installing it

for op in "$@";do
    case "$op" in
        -v|--version)
            echo "$ver_info"
            shift
            exit 0
            ;;
        -h|--help)
            echo "$help"
            shift
            exit 0
            ;;
        -sd|--source-dir)
            shift
            if [[ "$1" != "" ]]; then
                sdir="${1/%\//}"
                skipd=true
                if [[ ! -d "$sdir" ]]; then
                    echo "--- Directory doesn't exist: $sdir "
                    exit 1
                fi
                shift
            else
                echo "--- Arg missing for -sd option"
                exit 1
            fi
            ;;
        -t|--test)
            test=true
            shift
            ;;
        -u|--uninstall)
            chkroot
            uninstall
            shift
            exit 0
            ;;
        -*)
            echo "--- Invalid option: $1"
            shift
            exit 1
            ;;
    esac
done
############################################################

chkroot # check for root privilege

echo "*** Stoping Bluetooth..."
service bluetooth stop ||
systemctl stop bluetooth.service || true

echo "*** Installing kernel headers..."
apt-get update || true
apt-get install build-essential linux-headers-$(uname -r)

mkdir -p build/
cd build/
rm -rf build_$(uname -r)
mkdir build_$(uname -r)
cd build_$(uname -r)

if ! $skipd; then
    echo "*** Downloading kernel source..."
    apt-get source linux-image-$(uname -r)    # Get the kernel source code
fi

echo "*** Building kernel dependencies... (may be facultative)"
apt-get build-dep linux-image-$(uname -r) || true # Build kernel dependencies 

if ! $skipd; then
    cd $(ls -d */ | head -1)
else
    cd "$sdir"
fi
sdir="$(pwd -P)"

echo "*** Copying configuration..."
cp "/boot/config-$(uname -r)" .config
cp "/usr/src/linux-headers-$(uname -r)/Module.symvers" .

cd drivers/bluetooth/

echo "*** Patching..."
cp btusb.c btusb.c.old

echo '*** Adding BTUSB_MEDIATEK definiton ...'
if ! grep -e "^[[:blank:]]*#define BTUSB_MEDIATEK[[:blank:]].*" btusb.c >/dev/null; then
    interestingLine="$(grep -e "^[[:blank:]]*#define BTUSB_.*0x[1248]0*[[:blank:]]*$" btusb.c | tail -1)"
    echo "interestingLine = $interestingLine"
    interestingNumber=$(echo "$interestingLine" | sed 's/^.*\(0x[0-9]*\)[[:blank:]]*$/\1/g')
    echo "interestingNumber = $interestingNumber"
    newNumber=$(printf "0x%X\n" $(($interestingNumber + $interestingNumber)))
    echo "*** Adding the line #define BTUSB_MEDIATEK		$newNumber ..."
    sed -i "s/$interestingLine/&\n#define BTUSB_MEDIATEK		$newNumber/" btusb.c
else
    echo '... A definition for BTUSB_MEDIATEK exists (skipped)'
fi

echo '*** Adding .driver_info = BTUSB_MEDIATEK (if not exists already)...'
sed -i "s/{ USB_DEVICE(0x0e8d, 0x763f) },/{ USB_DEVICE(0x0e8d, 0x763f), .driver_info = BTUSB_MEDIATEK },/" btusb.c

echo '*** Adding BTUSB_MEDIATEK condition ...'
#sed -i "s/set_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, \&hdev->quirks);/&\n   }\n   if (id->driver_info \& BTUSB_MEDIATEK) {\n      set_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, \&hdev->quirks);\n/" btusb.c
patch='\n\tif (id->driver_info \& BTUSB_MEDIATEK) { \n\t\tset_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, \&hdev->quirks);\n\t}\n'
if ! grep -A2 -e 'if (id->driver_info & BTUSB_MEDIATEK)' btusb.c |
 	grep -e 'set_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks);' >/dev/null; then
    sed -i "s/^[[:blank:]]*if[[:blank:]]*(id->driver_info & BTUSB_INTEL)/$patch\n&/" btusb.c
else
    echo '... BTUSB_MEDIATEK condition was already added (skipped)'
fi

#cd ../../
cd "$sdir"

echo "*** make prepare"
make prepare
echo "*** make modules_prepare"
make modules_prepare
echo "*** make M=scripts/mod"
make M=scripts/mod
echo "*** make M=drivers/bluetooth/ modules"
make M=drivers/bluetooth/ modules

if ! $test; then
    echo "*** Saving old .ko"
    cp -f /lib/modules/$(uname -r)/kernel/drivers/bluetooth/btusb.ko /lib/modules/$(uname -r)/kernel/drivers/bluetooth/btusb.ko.old
    echo "*** Copying new .ko"
    cp drivers/bluetooth/btusb.ko /lib/modules/$(uname -r)/kernel/drivers/bluetooth
fi

echo "
*** Starting bluetooth (you may need a reboot to have bluetooth enabled).
=====  /\ =============================================
===   /  \     In order to have bluetooth enabled =====
===  /  | \    you should reboot your computer.   =====
=== /___o__\===========================================
I will try to load it, but if nothing happens, please reboot.
"

service bluetooth start ||
systemctl restart bluetooth.service