blob: 063699edf3a2ef2bc5147d1b92690ea2f9b7c19f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
#!/bin/sh
if [ $# -ne 2 ]
then
echo "usage: $0 <start|stop> <config>" >&2
exit 1
fi
action=$1
config=$2
gadget_name=mass-storage
gadget_dir=/sys/kernel/config/usb_gadget/$gadget_name
case "$config" in
0)
nbd_device=/dev/nbd0
;;
1)
nbd_device=/dev/nbd1
;;
*)
echo "invalid config $config" >&2
exit 1
;;
esac
set -ex
GADGET_BASE=/sys/kernel/config/usb_gadget
which_dev()
{
in_use="$(cat $GADGET_BASE/*/UDC)"
cd /sys/class/udc
for dev in *; do
case "$in_use" in
*"$dev"*) ;;
*) echo "$dev"; return 0;;
esac
done
return 1
}
case "$action" in
start)
mkdir -p $gadget_dir
(
cd $gadget_dir
# http://www.linux-usb.org/usb.ids
# |-> 1d6b Linux Foundation
# |-> 0104 Multifunction Composite Gadget
echo "0x1d6b" > idVendor
echo "0x0104" > idProduct
mkdir -p strings/0x409
echo "OpenBMC" > strings/0x409/manufacturer
echo "Virtual Media Device" > strings/0x409/product
mkdir -p configs/c.1/strings/0x409
echo "config 1" > configs/c.1/strings/0x409/configuration
mkdir -p functions/mass_storage.usb0
ln -s functions/mass_storage.usb0 configs/c.1
echo 1 > functions/mass_storage.usb0/lun.0/removable
echo 1 > functions/mass_storage.usb0/lun.0/ro
echo 0 > functions/mass_storage.usb0/lun.0/cdrom
echo $nbd_device > functions/mass_storage.usb0/lun.0/file
device=$(which_dev)
echo "$device" > UDC
)
;;
stop)
(
cd $gadget_dir
rm configs/c.1/mass_storage.usb0
rmdir functions/mass_storage.usb0
rmdir configs/c.1/strings/0x409
rmdir configs/c.1
rmdir strings/0x409
)
rmdir $gadget_dir
;;
*)
echo "invalid action $action" >&2
exit 1
esac
exit 0
|