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3c50e39d64
- Udev lookups now just return empty lists when they can't find anything - Made SPI dev interface factory Py2/3 safe
52 lines
1.9 KiB
Python
52 lines
1.9 KiB
Python
#
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# Copyright 2017 Ettus Research (National Instruments)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import pyudev
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from ..mpmlog import get_logger
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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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