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#!/bin/sh
# Add an Ethernet over USB gadget device and connect to a port of Aspeed USB
# virtual hub. If can't find any free port on virtual hub, exit with failure.
# If can't find the virtual hub, exit with failure.
# Author: Thinh Hung Pham <thinh.pham@amperecomputing.com>
# Signed-off-by: Chanh Nguyen <chnguyen@amperecomputing.com>
UDC_SYSPATH=/sys/class/udc
VHUB_DEVICE=1e6a0000.usb-vhub:p
GADGET_CONFIG_SYSPATH=/sys/kernel/config/usb_gadget
USBNET=usbnet
# The number of port on AST2500 USB virtual hub
NUM_PORT_USB_HUB=5
# idVendor = 0x1d6b: Linux Foundation
VENDORID=0x1d6b
# idProduct = 0x0103: NCM (Ethernet) Gadget
PRODUCTID=0x0103
# Language code = 0x409: English – United States
LANGUAGEID=0x409
SERIALNUMBER=cafecafe
MANUFACTURER=Aspeed
FUNCTION=ecm.usb0
if [ ! -d ${GADGET_CONFIG_SYSPATH} ]; then
# GADGET_CONFIG_SYSPATH is not exist
# Return 1 so that systemd knows the service failed to start
echo "ERROR: ${GADGET_CONFIG_SYSPATH} : doesn't exist!"
exit 1
fi
find_free_vhub_port(){
for ((i=1;i<=${NUM_PORT_USB_HUB};i++))
do
state=$(cat ${UDC_SYSPATH}/${VHUB_DEVICE}${i}/state)
func=$(cat ${UDC_SYSPATH}/${VHUB_DEVICE}${i}/function)
if [ "${state}" == "not attached" -a "${func}" == "" ]; then
FREEUDC=${VHUB_DEVICE}${i}
break
fi
done
if [ ${i} -eq 6 ]; then
# Can't find a free port
# Return 1 so that systemd knows the service failed to start
echo "ERROR: Can't find a free port !"
exit 1
fi
}
if [ -d ${GADGET_CONFIG_SYSPATH}/${USBNET} ]; then
cd ${GADGET_CONFIG_SYSPATH}/${USBNET}
else
# Create the gadget
mkdir ${GADGET_CONFIG_SYSPATH}/${USBNET}
cd ${GADGET_CONFIG_SYSPATH}/${USBNET}
# Configure the gadget
echo ${VENDORID} > idVendor
echo ${PRODUCTID} > idProduct
mkdir strings/${LANGUAGEID}
echo ${SERIALNUMBER} > strings/${LANGUAGEID}/serialnumber
echo ${MANUFACTURER} > strings/${LANGUAGEID}/manufacturer
echo ${USBNET} > strings/${LANGUAGEID}/product
# Create the configuration
mkdir configs/c.1
mkdir configs/c.1/strings/${LANGUAGEID}
# Create the function
mkdir functions/${FUNCTION}
# Associate the function with its configuration
ln -s functions/${FUNCTION} configs/c.1
fi
# Find an available virtual hub port
find_free_vhub_port
# Enable the gadget
echo ${FREEUDC} > UDC
if [[ $? -ne 0 ]]; then
# End
cd - > /dev/null
# Virtual HUB is not available
# Return 1 so that systemd knows the service failed to start
exit 1
fi
# End
cd - > /dev/null
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