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authorChristian Poessinger <christian@poessinger.com>2020-06-07 14:04:36 +0200
committerChristian Poessinger <christian@poessinger.com>2020-06-07 14:04:36 +0200
commit1c7d7cbd3963428888068af679946e6329567451 (patch)
treeedd24f2122ed0f44a8c9aa1c4814ae76ae524f7a /src/migration-scripts/interfaces/10-to-11
parent1fc4aadb5d87643d6e64805b19a5a9e7671737ba (diff)
downloadvyos-1x-1c7d7cbd3963428888068af679946e6329567451.tar.gz
vyos-1x-1c7d7cbd3963428888068af679946e6329567451.zip
wwan: T2529: migrate device from ttyUSB to usbXbY.YpZ.Z
During testing it was discovered that there is a well known problem (we had for ethernet interfaces) also in the serial port world. They will be enumerated and mapped to /dev/ttyUSBxxx differently from boot to boot. This is especially painful on my development APU4 board which also has a Sierra Wireless MC7710 LTE module installed. The serial port will toggle between ttyUSB2 and ttyUSB5 depending on the amount of serial port extenders attached (FT4232H). The shipped udev rule (/usr/lib/udev/rules.d/60-serial.rules) partly solves this by enumerating the devices into /dev/serial/by-id folder with their name and serial number - it's a very good idea but I've found that not all of the FT4232H dongles have a serial number programmed - this leads to the situation that when you plug in two cables with both having serial number 0 - only one device symlink will appear - the previous one is always overwritten by the latter one. Derive /usr/lib/udev/rules.d/60-serial.rules and create a /dev/serial/by-bus directory and group devices by attached USB root port. vyos@vyos:~$ find /dev/serial/by-bus/ -name usb* -exec basename {} \; | sort usb0b1.3p1.0 usb0b1.3p1.2 usb0b1.3p1.3 usb0b2.4p1.0 usb0b2.4p1.1 usb0b2.4p1.2 usb0b2.4p1.3 So we have USB root 0 with bus 1.3 and port 1.0. The enumeration is constant accross reboots.
Diffstat (limited to 'src/migration-scripts/interfaces/10-to-11')
-rwxr-xr-xsrc/migration-scripts/interfaces/10-to-1155
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diff --git a/src/migration-scripts/interfaces/10-to-11 b/src/migration-scripts/interfaces/10-to-11
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+++ b/src/migration-scripts/interfaces/10-to-11
@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# 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/>.
+
+# rename WWAN (wirelessmodem) serial interface from non persistent ttyUSB2 to
+# a bus like name, e.g. "usb0b1.3p1.3"
+
+import os
+
+from sys import exit, argv
+from vyos.configtree import ConfigTree
+
+if __name__ == '__main__':
+ if (len(argv) < 1):
+ print("Must specify file name!")
+ exit(1)
+
+ file_name = argv[1]
+ with open(file_name, 'r') as f:
+ config_file = f.read()
+
+ config = ConfigTree(config_file)
+ base = ['interfaces', 'wirelessmodem']
+ if not config.exists(base):
+ # Nothing to do
+ exit(0)
+
+ for wwan in config.list_nodes(base):
+ if config.exists(base + [wwan, 'device']):
+ device = config.return_value(base + [wwan, 'device'])
+
+ for root, dirs, files in os.walk('/dev/serial/by-bus'):
+ for file in files:
+ device_file = os.path.realpath(os.path.join(root, file))
+ if os.path.basename(device_file) == device:
+ config.set(base + [wwan, 'device'], value=file, replace=True)
+
+ try:
+ with open(file_name, 'w') as f:
+ f.write(config.to_string())
+ except OSError as e:
+ print("Failed to save the modified config: {}".format(e))
+ exit(1)