mirror of
https://github.com/armbian/build
synced 2025-09-24 19:47:06 +07:00
90e8f74515
NCM has advantages over RNDIS and postmarketOS has toggled to it 2 years ago. And I have tested it can work with common linux and window10. I also made some changes to let this script run inside intramfs. And the systemd service can run well after rootfs is loaded.
106 lines
3.7 KiB
Bash
Executable File
106 lines
3.7 KiB
Bash
Executable File
#!/bin/bash
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deviceinfo_name="USB Gadget Network"
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deviceinfo_manufacturer="Armbian"
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#deviceinfo_usb_idVendor=
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#deviceinfo_usb_idProduct=
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#deviceinfo_usb_serialnumber=
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setup_usb_network_configfs() {
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# See: https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
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CONFIGFS=/sys/kernel/config/usb_gadget
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if ! [ -e "$CONFIGFS" ]; then
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echo " $CONFIGFS does not exist, skipping configfs usb gadget"
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return
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fi
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if [ -e "$CONFIGFS/g1" ]; then
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echo " $CONFIGFS/g1 already exists, skipping configfs usb gadget"
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return
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fi
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# Default values for USB-related deviceinfo variables
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usb_idVendor="${deviceinfo_usb_idVendor:-0x1D6B}" # Linux Foundation
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usb_idProduct="${deviceinfo_usb_idProduct:-0x0103}" # NCM (Ethernet) Gadget
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usb_serialnumber="${deviceinfo_usb_serialnumber:-0123456789}"
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usb_network_function="ncm.usb0"
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echo " Setting up an USB gadget through configfs"
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# Create an usb gadet configuration
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mkdir $CONFIGFS/g1 || echo " Couldn't create $CONFIGFS/g1"
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echo "$usb_idVendor" > "$CONFIGFS/g1/idVendor"
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echo "$usb_idProduct" > "$CONFIGFS/g1/idProduct"
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echo 0x0100 > "$CONFIGFS/g1/bcdDevice"
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echo 0x0200 > "$CONFIGFS/g1/bcdUSB"
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# Create english (0x409) strings
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mkdir $CONFIGFS/g1/strings/0x409 || echo " Couldn't create $CONFIGFS/g1/strings/0x409"
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# shellcheck disable=SC2154
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echo "$deviceinfo_manufacturer" > "$CONFIGFS/g1/strings/0x409/manufacturer"
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echo "$usb_serialnumber" > "$CONFIGFS/g1/strings/0x409/serialnumber"
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# shellcheck disable=SC2154
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echo "$deviceinfo_name" > "$CONFIGFS/g1/strings/0x409/product"
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# Create network function.
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mkdir $CONFIGFS/g1/functions/"$usb_network_function" ||
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echo " Couldn't create $CONFIGFS/g1/functions/$usb_network_function"
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# Create configuration instance for the gadget
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mkdir $CONFIGFS/g1/configs/c.1 ||
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echo " Couldn't create $CONFIGFS/g1/configs/c.1"
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echo 250 > $CONFIGFS/g1/configs/c.1/MaxPower
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mkdir $CONFIGFS/g1/configs/c.1/strings/0x409 ||
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echo " Couldn't create $CONFIGFS/g1/configs/c.1/strings/0x409"
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echo "NCM Configuration" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration ||
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echo " Couldn't write configration name"
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# Link the network instance to the configuration
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ln -s $CONFIGFS/g1/functions/"$usb_network_function" $CONFIGFS/g1/configs/c.1 ||
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echo " Couldn't symlink $usb_network_function"
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# Check if there's an USB Device Controller
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if [ -z "$(ls /sys/class/udc)" ]; then
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echo " No USB Device Controller available"
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return
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fi
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# Link the gadget instance to an USB Device Controller. This activates the gadget.
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# See also: https://github.com/postmarketOS/pmbootstrap/issues/338
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# shellcheck disable=SC2005
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echo "$(ls /sys/class/udc)" > $CONFIGFS/g1/UDC || echo " Couldn't write UDC"
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}
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set_usbgadget_ipaddress() {
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local host_ip="${unudhcpd_host_ip:-172.16.42.1}"
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local client_ip="${unudhcpd_client_ip:-172.16.42.2}"
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unudhcpd_pid=$(pgrep unudhcpd)
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if [ "x$unudhcpd_pid" != "x" ]; then
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echo "unudhcpd process already exists, skip setting usb gadget ip, unudhcpd_pid is $unudhcpd_pid"
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return
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fi
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echo "Starting dnsmasq with server ip $host_ip, client ip: $client_ip"
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# Get usb interface
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INTERFACE=""
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ip a add "${host_ip}/255.255.0.0" dev usb0 2> /dev/null && ip link set usb0 up && INTERFACE=usb0
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if [ -z $INTERFACE ]; then
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ip a add "${host_ip}/255.255.0.0" dev eth0 2> /dev/null && eth0 && INTERFACE=eth0
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fi
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if [ -z $INTERFACE ]; then
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echo " Could not find an interface to run a dhcp server on"
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echo " Interfaces:"
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ip link
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return
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fi
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echo " Using interface $INTERFACE"
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echo " Starting the DHCP daemon"
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ip a show $INTERFACE > /var/log/unudhcpd.log
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nohup /usr/bin/unudhcpd -i "$INTERFACE" -s "$host_ip" -c "$client_ip" >> /var/log/unudhcpd.log 2>&1 &
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return
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}
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setup_usb_network_configfs
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set_usbgadget_ipaddress
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