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