init.usb

#!/bin/sh
################################################################################
#
# Generic ramdisk init process for booting a device. Based Marko Saukko's
# initrd for Galaxy Note GT-i9250. Reworked by Roberto A. Foglietta.
#
# Copyright (C) 2014 Jolla Ltd.
# Copyright (C) 2012 Marko Saukko
# Copyright (C) 2023 Roberto A. Foglietta
#     Contact: roberto.foglietta@gmail.com
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
################################################################################
# release: 0.0.3

GADGET_DIR="/config/usb_gadget/g1"
ANDROID_USB="/sys/class/android_usb/android0"
USB_FUNCTIONS="rndis"

################################################################################

write()
{
    echo -n "$2" > "$1"
}

# This sets up the USB with whatever USB_FUNCTIONS are set to via configfs
usb_setup_configfs() {
    G_USB_ISERIAL=$GADGET_DIR/strings/0x409/serialnumber
    mkdir $GADGET_DIR
    write $GADGET_DIR/idVendor                   "0x2931"
    write $GADGET_DIR/idProduct                  "0x0A06"
    mkdir $GADGET_DIR/strings/0x409
    write $GADGET_DIR/strings/0x409/serialnumber "$1"
    write $GADGET_DIR/strings/0x409/manufacturer "robang74"
    write $GADGET_DIR/strings/0x409/product      "recovery"

    if echo $USB_FUNCTIONS | grep -q "rndis"; then
        mkdir $GADGET_DIR/functions/rndis.rndis0
        mkdir $GADGET_DIR/functions/rndis_bam.rndis
    fi

    mkdir $GADGET_DIR/configs/c.1
    mkdir $GADGET_DIR/configs/c.1/strings/0x409
    write $GADGET_DIR/configs/c.1/strings/0x409/configuration "$USB_FUNCTIONS"

    if echo $USB_FUNCTIONS | grep -q "rndis"; then
        ln -s $GADGET_DIR/functions/rndis.rndis0 $GADGET_DIR/configs/c.1
        ln -s $GADGET_DIR/functions/rndis_bam.rndis $GADGET_DIR/configs/c.1
    fi

    echo "$(ls -1 /sys/class/udc)" > $GADGET_DIR/UDC
}

# This sets up the USB with whatever USB_FUNCTIONS are set to via android_usb
usb_setup_android_usb() {
    G_USB_ISERIAL=$ANDROID_USB/iSerial
    write $ANDROID_USB/enable          0
    write $ANDROID_USB/functions       ""
    write $ANDROID_USB/enable          1
    usleep 500000 # 0.5 delay to attempt to remove rndis function
    write $ANDROID_USB/enable          0
    write $ANDROID_USB/idVendor        2931
    write $ANDROID_USB/idProduct       0A06
    write $ANDROID_USB/iManufacturer   "robang74"
    write $ANDROID_USB/iProduct        "recovery"
    write $ANDROID_USB/iSerial         "$1"
    write $ANDROID_USB/functions       $USB_FUNCTIONS
    write $ANDROID_USB/enable          1
}


# This determines which USB setup method is going to be used
usb_setup() {
    if [ -f $ANDROID_USB/enable ]; then
        usb_setup_android_usb $1
    else
        usb_setup_configfs $1
    fi
}

################################################################################

usb_setup "redfishos"