#!/usr/bin/env python3
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# Enable NFC on Linux (CCID/PCSCD)
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# Dell E7470
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# Dell ControlVault2
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# BCM20795 (20795A1)
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import binascii
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import logging
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import math
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import struct
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import sys
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import time
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import usb.core
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import usb.util
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VENDOR_ID = 0x0A5C
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DEVICE_ID = 0x5834
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logging.basicConfig(level=logging.DEBUG)
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logger = logging.getLogger(__name__)
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def to_hex(val):
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return ' '.join([bytes([i]).hex() for i in val])
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class BcmCommunicator:
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def __init__(self, device, bulk_in, bulk_out):
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self.logger = logging.getLogger(__name__)
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self.device = device
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self.bulk_in = bulk_in
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self.bulk_out = bulk_out
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def ctrl_transfer(self, *args, **kwargs):
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self.logger.debug('Control: {} {}'.format(args, kwargs))
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return self.device.ctrl_transfer(*args, **kwargs)
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def write(self, *args, **kwargs):
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return self.bulk_out.write(*args, **kwargs)
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def read(self, *args, **kwargs):
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return self.bulk_in.read(*args, **kwargs)
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def send_packet(self, payload):
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packet_type = 0x01
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unknown1 = 0x00
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length = len(payload)
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packet = struct.pack('>BBH', packet_type, unknown1, length) + payload
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self.logger.debug('Put: {}'.format(to_hex(packet)))
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self.write(packet)
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def recv_packet(self):
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packet = self.read(64, timeout=5000).tobytes()
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tag = packet[0:2]
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if tag != b'\x00\x00':
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raise Exception('Unknown tag: {}'.format(tag.hex()))
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length = packet[2:4]
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length = struct.unpack('>H', length)[0]
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for i in range(0, math.ceil(length/64) - 1):
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packet += self.read(64).tobytes()
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self.logger.debug('Got: {}'.format(to_hex(packet)))
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return packet[4:]
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def talk(self, exchange):
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for packet in exchange:
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self.send_packet(bytes.fromhex(packet))
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data = self.recv_packet()
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if data[1] == 0x61:
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packet = self.recv_packet()
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@classmethod
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def find(cls, vendor_id, product_id):
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logger = logging.getLogger(__name__)
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logger.info('Looking for device {:04X}:{:04X}...'.format(vendor_id, product_id))
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device = usb.core.find(idVendor=vendor_id, idProduct=product_id)
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if device is None:
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raise Exception('Cannot find device {:04X}:{:04X}'.format(vendor_id, product_id))
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logger.debug('Enumerating interfaces...')
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configuration = device.get_active_configuration()
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bcm_interface = None
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for interface in configuration:
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if interface.bInterfaceClass == 0xff and interface.iInterface == 0x08:
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bcm_interface = interface
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break
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if bcm_interface is None:
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raise Exception('Cannot find vendor-specific interface')
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logger.debug('Interface found: {}'.format(bcm_interface._str()))
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logger.debug('Enumerating endpoints...')
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bulk_in = None
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bulk_out = None
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for endpoint in bcm_interface:
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if endpoint.bmAttributes & usb.util._ENDPOINT_TRANSFER_TYPE_MASK == usb.util.ENDPOINT_TYPE_BULK:
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if endpoint.bEndpointAddress & usb.util._ENDPOINT_DIR_MASK == usb.util.ENDPOINT_IN:
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if bulk_in is not None:
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raise Exception('More than one BULK IN endpoint found!')
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bulk_in = endpoint
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logger.debug('BULK IN found: {}'.format(bulk_in._str()))
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if endpoint.bEndpointAddress & usb.util._ENDPOINT_DIR_MASK == usb.util.ENDPOINT_OUT:
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if bulk_out is not None:
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raise Exception('More than one BULK OUT endpoint found!')
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bulk_out = endpoint
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logger.debug('BULK OUT found: {}'.format(bulk_out._str()))
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if bulk_in is None:
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raise Exception('BULK IN endpoint not found!')
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if bulk_out is None:
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raise Exception('BULK OUT endpoint not found!')
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logger.debug('Returning {} object...'.format(cls.__name__))
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return cls(device, bulk_in, bulk_out)
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turn_on_seq1 = [
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"10 2f 04 00",
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"10 2f 1d 03 05 90 65",
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"10 2f 2d 00",
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"10 2f 11 01 f7",
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"01 27 fc 0c 08 00 01 00 01 00 00 00 00 00 00 00",
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]
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turn_on_seq2 = [
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"10 20 00 01 01",
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"10 20 01 02 01 00",
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"10 20 02 67 01 b9 64 01 00 ff ff 50 00 8b 13 00 10 00 06 00 00 00 00 00 ff 00 00 00 ff 00 00 04 00 00 00 00 03 00 00 00 03 00 0c 00 00 0d 00 00 00 00 00 00 00 00 00 00 33 23 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 00 02 53 3b 0f 00 00 00 00 00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00",
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"10 20 02 90 0a ca 05 00 00 00 00 2c 80 01 01 b0 05 01 03 03 03 08 b5 03 01 03 ff c9 0d 24 00 00 00 01 00 bb 00 e4 00 0a 01 02 d6 0d 01 02 00 00 00 00 00 01 00 01 5a 00 8a b2 02 e8 03 c8 1e 06 1f 00 0a 00 30 00 04 24 00 1c 00 75 00 77 00 76 00 1c 00 03 00 0a 00 56 01 00 00 40 04 d7 01 07 dd 32 00 00 00 29 16 08 08 06 04 00 00 00 1f 27 0a 6d 20 00 52 20 00 00 00 01 85 00 00 32 1f 00 00 02 0a 16 00 02 55 55 55 55 55 55 55 55 55 55 55 55 55 1e",
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"10 20 02 06 01 b7 03 02 00 01",
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"10 2f 06 01 01",
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"10 20 02 0e 02 51 08 20 79 ff ff ff ff ff ff 58 01 07",
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"10 21 00 07 02 04 03 02 05 03 03",
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"10 20 02 17 01 29 14 46 66 6d 01 01 11 02 02 07 ff 03 02 00 13 04 01 64 07 01 03",
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"10 20 02 1a 02 61 14 46 66 6d 01 01 11 02 02 07 ff 03 02 00 13 04 01 64 07 01 03 60 01 07",
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"10 20 02 10 05 30 01 04 31 01 00 32 01 40 38 01 00 50 01 02",
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"10 20 02 05 01 00 02 fa 00",
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"10 20 02 0b 01 c2 08 01 08 00 04 80 c3 c9 01",
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"10 21 03 0d 06 00 01 01 01 02 01 80 01 82 01 06 01",
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]
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def turn_on(communicator):
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communicator.ctrl_transfer(0x41, 0, 1, 3)
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communicator.talk(turn_on_seq1)
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communicator.ctrl_transfer(0x41, 1, 0, 3)
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communicator.talk(turn_on_seq2)
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communicator.ctrl_transfer(0x41, 1, 1, 3)
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def turn_off(communicator):
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communicator.ctrl_transfer(0x41, 1, 0, 3)
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communicator.ctrl_transfer(0x41, 0, 0, 3)
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print('Usage: {} [on|off]'.format(sys.argv[0]))
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sys.exit(2)
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communicator = BcmCommunicator.find(VENDOR_ID, DEVICE_ID)
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if sys.argv[1] == 'on':
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logger.info('Turning NFC on...')
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turn_on(communicator)
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logger.info('NFC should be turned on now!')
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elif sys.argv[1] == 'off':
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logger.info('Turning NFC off...')
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turn_off(communicator)
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logger.info('NFC should be turned off now!')
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else:
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raise Exception('Unknown option: {}'.format(sys.argv[1]))
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