#!/bin/sh

# based on https://github.com/baskerville/plato/blob/master/scripts/usb-enable.sh

lsmod | grep -q g_file_storage && exit 1

PCB_ID=$(/usr/bin/ntxinfo /dev/mmcblk0 | grep pcb | cut -d ":" -f2)
DISK=/dev/mmcblk

if [ "${PCB_ID}" -eq 22 ] || [ "${PCB_ID}" -eq 23 ]; then
    PRODUCT_ID=${PRODUCT_ID:-"0xAD78"}
    PARTITIONS="${DISK}0p7"
else
    PRODUCT_ID=${PRODUCT_ID:-"0xAD79"}
    PARTITIONS="${DISK}0p4"
fi

[ -e "${DISK}1p1" ] && PARTITIONS="${PARTITIONS},${DISK}1p1"

sync
echo 3 >/proc/sys/vm/drop_caches

for name in public sd; do
    DIR=/mnt/"${name}"
    if grep -q "${DIR}" /proc/mounts; then
        umount "${DIR}" || umount -l "${DIR}"
    fi
done

MODULE_PARAMETERS="vendor=0x2A47 product=${PRODUCT_ID} vendor_id=BQ product_id=Cervantes"
modprobe g_file_storage file="${PARTITIONS}" stall=1 removable=1 "${MODULE_PARAMETERS}"

sleep 1