mpm: Harmonize imports, tidy + sort modules

- Moved nijesdcore to cores/
- Moved udev, net, dtoverlay, uio to sys_utils/
- Made all imports non-relative (except in __init__.py files)
- Removed some unnecessary imports
- Reordered some imports for Python conventions

1 files changed, 51 insertions, 0 deletions

diff --git a/mpm/python/usrp_mpm/sys_utils/udev.py b/mpm/python/usrp_mpm/sys_utils/udev.py
new file mode 100644
index 000000000..87d264d2d
--- /dev/null
+++ b/mpm/python/usrp_mpm/sys_utils/udev.py
@@ -0,0 +1,51 @@
+#
+# Copyright 2017 Ettus Research (National Instruments)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+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")
+    ]
+