I am trying to get a BBBW to register itself as a pure HID device.
I'm starting with a modified version of Phil Polstra's bash script
presented at DEF CON (attached). His script was built originally for
Ubuntu, but I'm running the latest 9.1 Debian image.
I have updated the original last line from echoing 'musb-hdrc.0.auto' to
'musb-hdrc.0' (for versions 4.9.x, which mine is).
Here's what happens:
*debian@beaglebone*:*~*$ sudo bash create-hid-BB.sh
create-hid-BB.sh: line 44: echo: write error: Device or resource busy
*debian@beaglebone*:*~*$ sudo bash create-hid-BB.sh
create-hid-BB.sh: line 29: echo: write error: Device or resource busy
create-hid-BB.sh: line 30: echo: write error: Device or resource busy
create-hid-BB.sh: line 31: echo: write error: Device or resource busy
cp: error writing
'/sys/kernel/config/usb_gadget/kb/functions/hid.usb0/report_desc': Device
or resource busy
ln: failed to create symbolic link
'/sys/kernel/config/usb_gadget/kb/configs/c.1/hid.usb0': File exists
create-hid-BB.sh: line 44: echo: write error: Device or resource busy
*debian@beaglebone*:*~*$ sudo bash create-hid-BB.sh
create-hid-BB.sh: line 29: echo: write error: Device or resource busy
create-hid-BB.sh: line 30: echo: write error: Device or resource busy
create-hid-BB.sh: line 31: echo: write error: Device or resource busy
cp: error writing
'/sys/kernel/config/usb_gadget/kb/functions/hid.usb0/report_desc': Device
or resource busy
ln: failed to create symbolic link
'/sys/kernel/config/usb_gadget/kb/configs/c.1/hid.usb0': File exists
create-hid-BB.sh: line 44: echo: write error: Device or resource busy
I also tried:
1. Restarting the system.
2. Leaving g_multi in place.
3. Building a kb folder in another folder with the customizations
specified in the attached script.
4. Copying the kb folder to /sys/kernel/config/usb_gadget/
5. This also fails with the same messages. It's almost like the moment
there's a /sys/kernel/config/usb_gadget/kb folder, the system connects to
it and starts using it. (Note that during this time, my computer is NOT
registering the BBBW as a HID device yet).
It seems like it shouldn't be this difficult. How can I make a BBBW pure
HID?
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#!/bin/bash
# This script will create a HID device on the BBB
# if the g_multi device is loaded remove it
if lsmod | grep g_multi >/dev/null ; then
modprobe -r g_multi
fi
# check for the existance of configfs
if mount | grep '/sys/kernel/config' >/dev/null ; then
umount /sys/kernel/config
fi
mount none -t configfs /sys/kernel/config
# create a keyboard device
kbdir="/sys/kernel/config/usb_gadget/kb"
if [ ! -d "$kbdir" ] ; then
mkdir $kbdir
fi
echo 0x1337 >"$kbdir/idVendor"
echo 0x1337 >"$kbdir/idProduct"
echo 0x0100 >"$kbdir/bcdDevice"
echo 0x0100 >"$kbdir/bcdUSB" # Changed to suggest compatibility with USB 1.0. 0x0110 is 1.1, 0x0200 is USB 2.0.
if [ ! -d "$kbdir/configs/c.1" ] ; then
mkdir "$kbdir/configs/c.1"
fi
echo 500 >"$kbdir/configs/c.1/MaxPower"
if [ ! -d "$kbdir/functions/hid.usb0" ] ; then
mkdir "$kbdir/functions/hid.usb0"
fi
echo 1 >"$kbdir/functions/hid.usb0/subclass"
echo 1 >"$kbdir/functions/hid.usb0/protocol"
echo 8 >"$kbdir/functions/hid.usb0/report_length"
cp report_descriptor_kb.bin "$kbdir/functions/hid.usb0/report_desc"
ln -s "$kbdir/functions/hid.usb0" "$kbdir/configs/c.1"
#echo musb-hdrc.0.auto >"$kbdir/UDC"
#echo musb-hdrc.0.auto >"$kbdir/UDC"
#v4.4.x-ti
if [ -d /sys/class/udc/musb-hdrc.0.auto ] ; then
echo musb-hdrc.0.auto >"$kbdir/UDC"
else
#v4.9.x-ti
if [ -d /sys/class/udc/musb-hdrc.0 ] ; then
echo musb-hdrc.0 >"$kbdir/UDC"
fi
fi
