1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
# Copyright 2021-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import logging
from bumble.transport.common import Transport
from bumble.transport.file import open_file_transport
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
async def open_vhci_transport(spec: str | None) -> Transport:
'''
Open a VHCI transport (only available on some platforms).
The parameter string is either empty (to use the default VHCI device
path at /dev/vhci), or the path of a VHCI device
'''
HCI_VENDOR_PKT = 0xFF
HCI_BREDR = 0x00 # Controller type
# Open the VHCI device
transport = await open_file_transport(spec or '/dev/vhci')
# Override the source's `data_received` method so that we can
# filter out the vendor packet that is received just after the
# initial open
def vhci_data_received(data: bytes) -> None:
if len(data) > 0 and data[0] == HCI_VENDOR_PKT:
if len(data) == 4:
hci_index = data[2] << 8 | data[3]
logger.info(f'HCI index {hci_index}')
else:
transport.source.parser.feed_data(data) # type: ignore
transport.source.data_received = vhci_data_received # type: ignore
# Write the initial config
transport.sink.on_packet(bytes([HCI_VENDOR_PKT, HCI_BREDR]))
return transport
|
