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60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
# Copyright 2021-2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import logging
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from .file import open_file_transport
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# -----------------------------------------------------------------------------
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# Logging
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# -----------------------------------------------------------------------------
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logger = logging.getLogger(__name__)
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# -----------------------------------------------------------------------------
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async def open_vhci_transport(spec):
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'''
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Open a VHCI transport (only available on some platforms).
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The parameter string is either empty (to use the default VHCI device
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path at /dev/vhci), or the path of a VHCI device
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'''
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HCI_VENDOR_PKT = 0xff
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HCI_BREDR = 0x00 # Controller type
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# Open the VHCI device
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transport = await open_file_transport(spec or '/dev/vhci')
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# Override the source's `data_received` method so that we can
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# filter out the vendor packet that is received just after the
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# initial open
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def vhci_data_received(data):
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if len(data) > 0 and data[0] == HCI_VENDOR_PKT:
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if len(data) == 4:
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hci_index = data[2] << 8 | data[3]
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logger.info(f'HCI index {hci_index}')
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else:
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transport.source.parser.feed_data(data)
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transport.source.data_received = vhci_data_received
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# Write the initial config
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transport.sink.on_packet(bytes([HCI_VENDOR_PKT, HCI_BREDR]))
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return transport
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