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|
#!/bin/sh
setup_image()
{
set -x
local storage="$1"
local sz_mb="$2"
# create the backing store
dd if=/dev/zero of=$storage bs=1M seek=$sz_mb count=0 2>/dev/null
# this shows up as 23FC-F676 in /dev/disk/by-uuid
local diskid=0x23FCF676
mkdosfs -n 'OPENBMC-FW' -i $diskid -I $storage >/dev/null 2>&1
}
mount_image()
{
set -x
local storage="$1"
local stormnt="$2"
mkdir -p $stormnt || exit 1
mount -o loop -t vfat $storage $stormnt
}
cleanup_image()
{
set -x
local storage="$1"
local stormnt="$2"
umount -f "$stormnt"
rm -f "$storage"
rmdir "$stormnt"
}
GADGET_BASE=/sys/kernel/config/usb_gadget
which_dev()
{
local in_use=$(cat $GADGET_BASE/*/UDC)
cd /sys/class/udc
for D in *; do
case "$in_use" in
*"$D"*) ;;
*) echo "$D"; return 0;;
esac
done
return 1
}
usb_ms_insert()
{
local name="$1"
local storage="$2"
if [ -d $GADGET_BASE/$name ]; then
echo "device $name already exists" >&2
return 1
fi
mkdir $GADGET_BASE/$name
cd $GADGET_BASE/$name
echo 0x1d6b > idVendor # Linux Foundation
echo 0x0105 > idProduct # FunctionFS Gadget
mkdir strings/0x409
local machineid=$(cat /etc/machine-id)
local data="OpenBMC USB mass storage gadget device serial number"
local serial=$( echo -n "${machineid}${data}${machineid}" | \
sha256sum | cut -b 0-12 )
echo $serial > strings/0x409/serialnumber
echo OpenBMC > strings/0x409/manufacturer
echo "OpenBMC Mass Storage" > strings/0x409/product
mkdir configs/c.1
mkdir functions/mass_storage.$name
echo $storage > functions/mass_storage.$name/lun.0/file
echo 0 > functions/mass_storage.$name/lun.0/removable
mkdir configs/c.1/strings/0x409
echo "Conf 1" > configs/c.1/strings/0x409/configuration
echo 120 > configs/c.1/MaxPower
ln -s functions/mass_storage.$name configs/c.1
local dev=$(which_dev)
echo $dev > UDC
}
usb_ms_eject()
{
local name="$1"
echo '' > $GADGET_BASE/$name/UDC
rm -f $GADGET_BASE/$name/configs/c.1/mass_storage.$name
rmdir $GADGET_BASE/$name/configs/c.1/strings/0x409
rmdir $GADGET_BASE/$name/configs/c.1
rmdir $GADGET_BASE/$name/functions/mass_storage.$name
rmdir $GADGET_BASE/$name/strings/0x409
rmdir $GADGET_BASE/$name
}
usage()
{
echo "Usage: $0 <action> ..."
echo " $0 setup <file> <sizeMB>"
echo " $0 insert <name> <file>"
echo " $0 eject <name>"
echo " $0 mount <file> <mnt>"
echo " $0 cleanup <file> <mnt>"
exit 1
}
echo "$#: $0 $@"
case "$1" in
insert)
shift
usb_ms_insert "$@"
;;
eject)
shift
usb_ms_eject "$@"
;;
setup)
shift
setup_image "$@"
;;
mount)
shift
mount_image "$@"
;;
cleanup)
shift
cleanup_image "$@"
;;
*)
usage
;;
esac
exit $?
|
