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e9288a439c
- Fix typo in company name (missing 'a') - Updated SPDX license identifier to version 3.0
43 lines
1.3 KiB
Python
43 lines
1.3 KiB
Python
#
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# Copyright 2017 Ettus Research, a National Instruments Company
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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#
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"""
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Utilities for udev lookups
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"""
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import os
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import pyudev
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def get_eeprom_paths(address):
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"""
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Return list of EEPROM device paths for a given I2C address.
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If no device paths are found, an empty list is returned.
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"""
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context = pyudev.Context()
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parent = pyudev.Device.from_name(context, "platform", address)
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paths = [d.device_node if d.device_node is not None else d.sys_path
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for d in context.list_devices(parent=parent, subsystem="nvmem")]
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if len(paths) == 0:
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return []
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# We need to sort this so 9-0050 comes before 10-0050 (etc.)
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maxlen = max((len(os.path.split(p)[1]) for p in paths))
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paths = sorted(
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paths,
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key=lambda x: "{:>0{maxlen}}".format(os.path.split(x)[1], maxlen=maxlen)
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)
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return [os.path.join(x, 'nvmem') for x in paths]
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def get_spidev_nodes(spi_master):
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"""
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Return list of spidev device paths for a given SPI master. If no valid paths
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can be found, an empty list is returned.
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"""
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context = pyudev.Context()
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parent = pyudev.Device.from_name(context, "platform", spi_master)
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return [
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device.device_node
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for device in context.list_devices(parent=parent, subsystem="spidev")
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]
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