Linux bluetooth driver patch for MA530

ma530_patch.py

#!/usr/bin/env python3

import lzma
import re
import struct

# Find your current driver in /lib/modules/$(uname -r)/kernel/drivers/bluetooth/btusb.ko.xz
with lzma.open('./btusb.ko.xz.org', 'rb') as f:
    data = bytearray(f.read())

# See also https://patches.linaro.org/project/linux-bluetooth/patch/[email protected]/
#
# Instead of adding the device id, we replace an existing one to skip recompilation.
src = struct.pack('<HH', 0x2357, 0x0604)
dst = struct.pack('<HH', 0x2c4e, 0x0115)

idx = data.find(dst)
if idx != -1:
    print('[!] FATAL: Target device id is already supported')
    exit(-1)

idx = data.find(src)
if idx == -1:
    print('[!] FATAL: Source device id not found')
    exit(-1)

print(f'[+] Patch at 0x{idx:x}')
print('  ' + re.sub(r'(..)', r'\1 ', data[idx-4:idx+8].hex()), '->')
data[idx:idx+len(dst)] = dst
print('  ' + re.sub(r'(..)', r'\1 ', data[idx-4:idx+8].hex()))

if data.find(src) != -1:
    print(f'[!] FATAL: Source device id matched too many times')
    exit(-1)

with lzma.open('./btusb.ko.xz', 'wb') as f:
    f.write(data)

print('[+] Success! Please move the patched driver back to the modules folder')