使用 USB Gadget 功能，创建一个“键盘+鼠标+存储”复合设备，设备 ID 来自 Dell KB216 键盘。可配合 https://github.com/Sucareto/Android_HID_Keyboard 使用。

create-dell-key.sh

#!/bin/sh
# https://github.com/Sucareto/Android_HID_Keyboard

device_path="/config/usb_gadget/KB216"
ms_file="/data/data/com.termux/files/home/storage/tmp/mass_storage.img"
# create mass_storage image file
# dd if=/dev/zero of=$ms_file bs=1024MiB count=1
# fallocate -l 1G $ms_file
# loop_device=$(losetup -f)

echo "Clean up old files..."
rm "$device_path/configs/c.1/hid.keyboard"
rm "$device_path/configs/c.1/hid.mouse"
rm "$device_path/configs/c.1/mass_storage.0"
rmdir "$device_path/configs/c.1/strings/0x409"
rmdir "$device_path/configs/c.1"
rmdir "$device_path/functions/hid.keyboard"
rmdir "$device_path/functions/hid.mouse"
rmdir "$device_path/functions/mass_storage.0"
rmdir "$device_path/strings/0x409"
rmdir "$device_path"

# Clean only
[ "$1" == "-d" ] && exit 0

echo "Create new files..."
mkdir -p $device_path && cd $device_path
if [ $? -eq 0 ]; then
    echo 0x00 >bDeviceClass
    echo 0x00 >bDeviceProtocol
    echo 0x00 >bDeviceSubClass
    echo 0x08 >bMaxPacketSize0
    echo 0x0108 >bcdDevice
    echo 0x0100 >bcdUSB
    echo 0x2113 >idProduct
    echo 0x413c >idVendor
else
    echo "device create fail"
    exit 1
fi

mkdir -p "$device_path/strings/0x409" && cd "$device_path/strings/0x409/"
if [ $? -eq 0 ]; then
    echo "Dell Computer Corp." >manufacturer
    echo "KB216 Wired Keyboard" >product
    # echo "0" >serialnumber
else
    echo "strings create fail"
    exit 1
fi

# create keyboard function
mkdir -p "$device_path/functions/hid.keyboard" && cd "$device_path/functions/hid.keyboard"
if [ $? -eq 0 ]; then
    echo 1 >protocol # Keyboard
    echo 1 >subclass # Boot Interface Subclass
    echo 8 >report_length
    echo -ne "\\x05\\x01\\x09\\x06\\xa1\\x01\\x05\\x07\\x19\\xe0\\x29\\xe7\\x15\\x00\\x25\\x01\\x75\\x01\\x95\\x08\\x81\\x02\\x95\\x01\\x75\\x08\\x81\\x03\\x95\\x05\\x75\\x01\\x05\\x08\\x19\\x01\\x29\\x05\\x91\\x02\\x95\\x01\\x75\\x03\\x91\\x03\\x95\\x06\\x75\\x08\\x15\\x00\\x25\\x65\\x05\\x07\\x19\\x00\\x29\\x65\\x81\\x00\\xc0" >report_desc
else
    echo "keyboard functions create fail"
    exit 1
fi

# create mouse function
mkdir -p "$device_path/functions/hid.mouse" && cd "$device_path/functions/hid.mouse"
if [ $? -eq 0 ]; then
    echo 2 >protocol # Mouse
    echo 1 >subclass # Boot Interface Subclass
    echo 4 >report_length
    echo -ne "\\x05\\x01\\x09\\x02\\xa1\\x01\\x09\\x01\\xa1\\x00\\x05\\x09\\x19\\x01\\x29\\x05\\x15\\x00\\x25\\x01\\x95\\x05\\x75\\x01\\x81\\x02\\x95\\x01\\x75\\x03\\x81\\x01\\x05\\x01\\x09\\x30\\x09\\x31\\x09\\x38\\x15\\x81\\x25\\x7F\\x75\\x08\\x95\\x03\\x81\\x06\\xc0\\xc0" >report_desc
else
    echo "mouse functions create fail"
    exit 1
fi

# create mass_storage function
if [ -n "$ms_file" ]; then
    mkdir -p "$device_path/functions/mass_storage.0" && cd "$device_path/functions/mass_storage.0/lun.0"
    if [ $? -eq 0 ]; then
        echo 1 >../stall
        echo 0 >cdrom
        echo "Dell" >inquiry_string
        echo 0 >removable
        echo 0 >ro
        echo 0 >nofua
        echo "$ms_file" >file
    else
        echo "mass_storage functions create fail"
        exit 1
    fi
fi

# enable functions
mkdir -p "$device_path/configs/c.1/strings/0x409" && cd "$device_path/configs/c.1/"
if [ $? -eq 0 ]; then
    echo 100 >MaxPower
    echo "Sucareto Devices" >strings/0x409/configuration
    ln -s "$device_path/functions/hid.keyboard" ./
    ln -s "$device_path/functions/hid.mouse" ./
    [ -n "$ms_file" ] && ln -s "$device_path/functions/mass_storage.0" ./
else
    echo "functions enable fail"
    exit 1
fi

cd $device_path
ls /sys/class/udc >UDC

exit 0