create_usbhid.sh

#!/bin/sh

new_directory="/sys/kernel/config/usb_gadget/obmc_hid"

if [ -e "${new_directory}" ]; then
	exit 0
fi

# create gadget
original_directory="$(pwd)"
mkdir "${new_directory}"
cd "${new_directory}"

# add basic information
echo 0x0100 > bcdDevice
echo 0x0200 > bcdUSB
echo 0x0104 > idProduct		# Multifunction Composite Gadget
echo 0x1d6b > idVendor		# Linux Foundation

# create English locale
mkdir strings/0x409

echo "OpenBMC" > strings/0x409/manufacturer
echo "virtual_input" > strings/0x409/product
echo "OBMC0001" > strings/0x409/serialnumber

# Create HID keyboard function
mkdir functions/hid.0

echo 1 > functions/hid.0/protocol	# 1: keyboard
echo 8 > functions/hid.0/report_length
echo 1 > functions/hid.0/subclass

# Binary HID keyboard descriptor
#  0x05, 0x01, // USAGE_PAGE (Generic Desktop)
#  0x09, 0x06, // USAGE (Keyboard)
#  0xa1, 0x01, // COLLECTION (Application)
#  0x05, 0x07, //   USAGE_PAGE (Keyboard)
#  0x19, 0xe0, //   USAGE_MINIMUM (Keyboard LeftControl)
#  0x29, 0xe7, //   USAGE_MAXIMUM (Keyboard Right GUI)
#  0x15, 0x00, //   LOGICAL_MINIMUM (0)
#  0x25, 0x01, //   LOGICAL_MAXIMUM (1)
#  0x75, 0x01, //   REPORT_SIZE (1)
#  0x95, 0x08, //   REPORT_COUNT (8)
#  0x81, 0x02, //   INPUT (Data,Var,Abs)
#  0x95, 0x01, //   REPORT_COUNT (1)
#  0x75, 0x08, //   REPORT_SIZE (8)
#  0x81, 0x03, //   INPUT (Data,Var,Abs)
#  0x95, 0x05, //   REPORT_COUNT (5)
#  0x75, 0x01, //   REPORT_SIZE (1)
#  0x05, 0x08, //   USAGE_PAGE (LEDs)
#  0x19, 0x01, //   USAGE_MINIMUM (Num Lock)
#  0x29, 0x05, //   USAGE_MAXIMUM (Kana)
#  0x91, 0x02, //   OUTPUT (Data,Var,Abs)
#  0x95, 0x01, //   REPORT_COUNT (1)
#  0x75, 0x03, //   REPORT_SIZE (3)
#  0x91, 0x03, //   OUTPUT (Cnst,Var,Abs)
#  0x95, 0x06, //   REPORT_COUNT (6)
#  0x75, 0x08, //   REPORT_SIZE (8)
#  0x15, 0x00, //   LOGICAL_MINIMUM (0)
#  0x25, 0x65, //   LOGICAL_MAXIMUM (101)
#  0x05, 0x07, //   USAGE_PAGE (Keyboard)
#  0x19, 0x00, //   USAGE_MINIMUM (Reserved (no event indicated))
#  0x29, 0x65, //   USAGE_MAXIMUM (Keyboard Application)
#  0x81, 0x00, //   INPUT (Data,Ary,Abs)
#  0xc0        // END_COLLECTION
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' > functions/hid.0/report_desc

# Create HID mouse function
mkdir functions/hid.1

echo 2 > functions/hid.1/protocol	# 2: mouse
echo 5 > functions/hid.1/report_length
echo 1 > functions/hid.1/subclass

# Binary HID mouse descriptor (absolute coordinate)
#  0x05, 0x01,       // USAGE_PAGE (Generic Desktop)
#  0x09, 0x02,       // USAGE (Mouse)
#  0xa1, 0x01,       // COLLECTION (Application)
#  0x09, 0x01,       //   USAGE (Pointer)
#  0xa1, 0x00,       //   COLLECTION (Physical)
#  0x05, 0x09,       //     USAGE_PAGE (Button)
#  0x19, 0x01,       //     USAGE_MINIMUM (Button 1)
#  0x29, 0x03,       //     USAGE_MAXIMUM (Button 3)
#  0x15, 0x00,       //     LOGICAL_MINIMUM (0)
#  0x25, 0x01,       //     LOGICAL_MAXIMUM (1)
#  0x95, 0x03,       //     REPORT_COUNT (3)
#  0x75, 0x01,       //     REPORT_SIZE (1)
#  0x81, 0x02,       //     INPUT (Data,Var,Abs)
#  0x95, 0x01,       //     REPORT_COUNT (1)
#  0x75, 0x05,       //     REPORT_SIZE (5)
#  0x81, 0x03,       //     INPUT (Cnst,Var,Abs)
#  0x05, 0x01,       //     USAGE_PAGE (Generic Desktop)
#  0x09, 0x30,       //     USAGE (X)
#  0x09, 0x31,       //     USAGE (Y)
#  0x35, 0x00,       //     PHYSICAL_MINIMUM (0)
#  0x46, 0xff, 0x7f, //     PHYSICAL_MAXIMUM (32767)
#  0x15, 0x00,       //     LOGICAL_MINIMUM (0)
#  0x26, 0xff, 0x7f, //     LOGICAL_MAXIMUM (32767)
#  0x65, 0x11,       //     UNIT (SI Lin:Distance)
#  0x55, 0x00,       //     UNIT_EXPONENT (0)
#  0x75, 0x10,       //     REPORT_SIZE (16)
#  0x95, 0x02,       //     REPORT_COUNT (2)
#  0x81, 0x02,       //     INPUT (Data,Var,Abs)
#  0xc0,             //   END_COLLECTION
#  0xc0              // END_COLLECTION
echo -ne '\x05\x01\x09\x02\xa1\x01\x09\x01\xa1\x00\x05\x09\x19\x01\x29\x03\x15\x00\x25\x01\x95\x03\x75\x01\x81\x02\x95\x01\x75\x05\x81\x03\x05\x01\x09\x30\x09\x31\x35\x00\x46\xff\x7f\x15\x00\x26\xff\x7f\x65\x11\x55\x00\x75\x10\x95\x02\x81\x02\xc0\xc0' > functions/hid.1/report_desc

# Create configuration
mkdir configs/c.1
mkdir configs/c.1/strings/0x409

echo 0x80 > configs/c.1/bmAttributes
echo 200 > configs/c.1/MaxPower
echo "" > configs/c.1/strings/0x409/configuration

# Link HID functions to configuration
ln -s functions/hid.0 configs/c.1
ln -s functions/hid.1 configs/c.1

# Enable gadget
dev_name="1e6a0000.usb-vhub"
i=0
num_ports=5
base_usb_dir="/sys/bus/platform/devices/${dev_name}/${dev_name}:p"
while [ $i -lt $num_ports ]; do
	port=$(($i + 1))
	i=$port
	if [ ! -e "${base_usb_dir}${port}/gadget/suspended" ]; then
		break
	fi
done
echo "${dev_name}:p${port}" > UDC

cd "${original_directory}"