Added initial udev rules for the IC-705 to support CAT control and GPS

overlay/etc/udev/rules.d/80-et-ic705.rules

@@ -0,0 +1,27 @@
+# Author   : Gaston Gonzalez
+# Date     : 28 September 2024
+# Purpose  : udev rules for the Icom IC-705
+#
+# Preconditions:
+# 1. IC-705 connected via USB cable
+#
+# Postconditions:
+# 1. /dev/et-cat created
+# 2. /dev/et-gps created
+#
+# Resources
+# - https://www.florian-wolters.de/posts/ic705-serial-device-symlinks/
+
+# Set "IC-705" as an environment variable. This workaround is needed for the IC-705.
+# Refer to the document under the Resources above for the background details..
+KERNEL=="ttyACM[0-9]*", SUBSYSTEM=="tty", ATTRS{product}=="IC-705", ENV{PROD}="IC-705"
+
+# Create consistent device name/path for the CAT serial device
+ENV{PROD}=="IC-705", SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}=="00", \
+    ACTION=="add", GROUP="dialout", MODE="0660", SYMLINK+="et-cat"
+
+# Create consistent device name/path for the GPS serial device
+ENV{PROD}=="IC-705", SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}=="02", \
+    ACTION=="add", GROUP="dialout", MODE="0660", SYMLINK+="et-gps"
+
+# TODO: Add rules for sound card