[openwrt/openwrt] umbim: add support for wwan device class

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/9f76070e2de5c28830ede70c31fb81278f1c7183

commit 9f76070e2de5c28830ede70c31fb81278f1c7183
Author: Antti Seppälä <a.seppala at gmail.com>
AuthorDate: Tue May 27 11:20:09 2025 +0300

    umbim: add support for wwan device class
    
    Some MBIM devices can exist on an MHI bus (over PCIe) instead of being presented as USB devices.
    
    In such cases the interface name lookup needs to be done from /sys/class/wwan/ instead of /sys/class/usbmisc/
    
    Add another readlink call in case the first lookup fails.
    
    This allows the MBIM protocol to find the interface name and then work with both type of devices provided that /etc/config/network has the right device for MBIM interface (such as /dev/wwan0mbim0 in case of MHI)
    
    Signed-off-by: Antti Seppälä <a.seppala at gmail.com>
---
 package/network/utils/umbim/files/lib/netifd/proto/mbim.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/network/utils/umbim/files/lib/netifd/proto/mbim.sh b/package/network/utils/umbim/files/lib/netifd/proto/mbim.sh
index 01e8628d74..dc3a715522 100755
--- a/package/network/utils/umbim/files/lib/netifd/proto/mbim.sh
+++ b/package/network/utils/umbim/files/lib/netifd/proto/mbim.sh
@@ -73,7 +73,7 @@ _proto_mbim_setup() {
 	}
 
 	devname="$(basename "$device")"
-	devpath="$(readlink -f /sys/class/usbmisc/$devname/device/)"
+	devpath="$(readlink -f /sys/class/usbmisc/$devname/device/ || readlink -f /sys/class/wwan/$devname/device/)"
 	ifname="$( ls "$devpath"/net )"
 
 	[ -n "$ifname" ] || {