comgt: ncm: try to detect interface for ttyACM ports

Some modems expose ttyACM as their control ports, which have the
"device" symlink pointing one level down in sysfs tree. Try to find
network interfaces for them as well, this is commonly used for modems
exposing ACM + RNDIS or ACM + ECM interface combinations.

Co-developed-by: Cezary Jackiewicz <cezary@eko.one.pl>
Signed-off-by: Cezary Jackiewicz <cezary@eko.one.pl>
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
(cherry picked from commit ed7957810c0aee04943559be9b0ed23431ee0654)

diff --git a/package/network/utils/comgt/files/ncm.sh b/package/network/utils/comgt/files/ncm.sh
index c3a06165efc7da1583e624cc0d0d71add36cb34b..a2c913ea1d6f216be4ca010b0692eeadb23f29de 100644 (file)
--- a/package/network/utils/comgt/files/ncm.sh
+++ b/package/network/utils/comgt/files/ncm.sh
@@ -57,6 +57,10 @@ proto_ncm_setup() {
        [ -z "$ifname" ] && {
                devname="$(basename "$device")"
                case "$devname" in
+               'ttyACM'*)
+                       devpath="$(readlink -f /sys/class/tty/$devname/device)"
+                       ifpath="$devpath/../*/net"
+                       ;;
                'tty'*)
                        devpath="$(readlink -f /sys/class/tty/$devname/device)"
                        ifpath="$devpath/../../*/net"