filesystem: added script to create unique ttyUSB devices.

rules/filesystem/fs/sbin/mdev-ttyusb

@@ -0,0 +1,43 @@
+#! /bin/sh
+
+[ "$SUBSYSTEM" -ne "tty" ] && exit 0
+if [ -z "$MAJOR" ] || [ -z "$MINOR" ]; then
+    exit 0
+fi
+
+MAJOR_HEX=$(echo $(printf %2x "$MAJOR"))
+MINOR_HEX=$(echo $(printf %2x "$MINOR"))
+
+# env | while read line; do
+#           logger -t "$0" "$line"
+#       done
+
+case "$ACTION" in
+    add)
+        dev_root="/sys/$DEVPATH/../../../../"
+        itf_root="/sys/$DEVPATH/../../../"
+        vid="$(cat $dev_root/idVendor 2> /dev/null)"
+        pid="$(cat $dev_root/idProduct 2> /dev/null)"
+        serial="$(cat $dev_root/serial 2> /dev/null)"
+        [ -z "$serial" ] && serial='0'
+        itf="$(cat $itf_root/bInterfaceNumber 2> /dev/null)"
+        dev_name="${vid}_${pid}_${serial}_${itf}"
+        dev_file="/dev/uart/$dev_name"
+        logger -t "$0" "creating device: $dev_file"
+        mknod "$dev_file" c "$MAJOR" "$MINOR"
+        ;;
+
+    remove)
+        removed_major_minor="$MAJOR_HEX:$MINOR_HEX"
+
+        for f in /dev/uart/*; do
+            file_major_minor="$(stat -c %t:%T "$f")"
+            #logger -t "$0" "$f | $removed_major_minor | $file_major_minor"
+
+            if [ "$file_major_minor" = "$removed_major_minor" ]; then
+                logger -t "$0" "removing device: $f"
+                rm -f "$f"
+            fi
+        done
+        ;;
+esac