Adrian / S41usbconfigfs

#!/bin/sh # Largely taken from postmarketOS' init functions, many thanks! # Their repository is licensed under the terms of the GPLv3, same as waitaha. # https://gitlab.com/postmarketOS/pmaports/-/blob/master/main/postmarketos-initramfs/init_functions.sh umask 077 start() { printf "Configuring USB: " mkdir /config mount -t configfs -o nodev,noexec,nosuid configfs /config CONFIGFS=/config/usb_gadget if ! [ -e "$CONFIGFS" ]; then echo "SKIP" return fi # Default values for USB-related deviceinfo variables usb_idVendor="0x18D1" # default: Google Inc. usb_idProduct="0xD001" # default: Nexus 4 (fastboot) usb_serialnumber="waitaha" usb_network_function="ncm.usb0" usb_network_function_fallback="rndis.usb0" usb_adb_function="ffs.usb0" usb_mass_storage_function="mass_storage.0" deviceinfo_manufacturer=$(cat /etc/deviceinfo | sed -n 's/.*manufacturer=\([^,]*\)[,]*/\1/p; s/.*manufacturer=\([^,]*\)$/\1/p') deviceinfo_name=$(cat /etc/deviceinfo | sed -n 's/.*name=\([^,]*\),codename.*/\1/p') # Create an usb gadget configuration mkdir $CONFIGFS/g1 echo "$usb_idVendor" > "$CONFIGFS/g1/idVendor" echo "$usb_idProduct" > "$CONFIGFS/g1/idProduct" echo 0x0223 > "$CONFIGFS/g1/bcdDevice" echo 0x0200 > "$CONFIGFS/g1/bcdUSB" # Create English (0x409) strings mkdir $CONFIGFS/g1/strings/0x409 || echo " Couldn't create $CONFIGFS/g1/strings/0x409" echo "$deviceinfo_manufacturer" > "$CONFIGFS/g1/strings/0x409/manufacturer" echo "$usb_serialnumber" > "$CONFIGFS/g1/strings/0x409/serialnumber" echo "$deviceinfo_name" > "$CONFIGFS/g1/strings/0x409/product" # Create network function. if ! mkdir $CONFIGFS/g1/functions/"$usb_network_function"; then echo " Couldn't create $CONFIGFS/g1/functions/$usb_network_function" # Try the fallback function next if mkdir $CONFIGFS/g1/functions/"$usb_network_function_fallback"; then usb_network_function="$usb_network_function_fallback" else echo " Couldn't create $CONFIGFS/g1/functions/$usb_network_function_fallback" fi fi # Create ADB FunctionFS entry if ! mkdir $CONFIGFS/g1/functions/"$usb_adb_function"; then echo " Couldn't create $CONFIGFS/g1/functions/$usb_adb_function" fi # Create mass storage function entry if ! mkdir $CONFIGFS/g1/functions/"$usb_mass_storage_function"; then echo " Couldn't create $CONFIGFS/g1/function/$usb_mass_storage_function" fi # Create configuration instance for the gadget mkdir $CONFIGFS/g1/configs/c.1 mkdir $CONFIGFS/g1/configs/c.1/strings/0x409 echo "USB networking and storage and ADB" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration i=1 for disk in $(lsblk -d -I 8 -o KNAME -n); do if ! mkdir $CONFIGFS/g1/functions/"$usb_mass_storage_function/lun.$i"; then echo " Couldn't create $CONFIGFS/g1/functions/$usb_mass_storage_function/lun.$i" fi echo /dev/"$disk" > $CONFIGFS/g1/functions/"$usb_mass_storage_function/lun.$i"/file i=$(( i + 1 )) done # Link the network instance to the configuration ln -s $CONFIGFS/g1/functions/"$usb_network_function" $CONFIGFS/g1/configs/c.1 # Link the ADB function to the configuration ln -s $CONFIGFS/g1/functions/"$usb_adb_function" $CONFIGFS/g1/configs/c.1 # Link the mass storage function to the configuration ln -s $CONFIGFS/g1/functions/"$usb_mass_storage_function" $CONFIGFS/g1/configs/c.1 # Create adb mount point mkdir -p /dev/usb-ffs/adb # mount -o uid=2000,gid=2000 -t functionfs usb0 /dev/usb-ffs/adb mount -t functionfs usb0 /dev/usb-ffs/adb adbd & sleep 1 # Check if there's a USB Device Controller _udc_dev=$(ls /sys/class/udc) if [ -z "$_udc_dev" ]; then return fi # Remove any existing UDC to avoid "write error: Resource busy" when setting UDC again if [ "$(wc -w <$CONFIGFS/g1/UDC)" -gt 0 ]; then echo "" > $CONFIGFS/g1/UDC || echo " Couldn't write to clear UDC" fi # Link the gadget instance to a USB Device Controller. This activates the gadget. # See also: https://gitlab.com/postmarketOS/pmbootstrap/issues/338 echo "$_udc_dev" > $CONFIGFS/g1/UDC # Bring up the network interface ip addr add 172.16.42.1/24 dev usb0 ip link set usb0 up echo "OK" } case "$1" in start) start ;; *) echo "Usage: $0 start" exit 1 esac exit $?