~ # ls -la /sys/class/android_usb/android0/
drwxr-xr-x    4 root     root             0 Feb 19 21:09 .
drwxr-xr-x    3 root     root             0 Feb 19 21:09 ..
drwxr-xr-x    3 root     root             0 Feb 19 21:09 f_midi
drwxr-xr-x    2 root     root             0 Feb 19 22:03 power
-r--r--r--    1 root     root          4096 Feb 19 22:03 state
lrwxrwxrwx    1 root     root             0 Feb 19 22:03 subsystem -> ../../../../class/android_usb
-rw-r--r--    1 root     root          4096 Feb 19 22:03 uevent

and configfs:
~ # find /config/usb_gadget/
/config/usb_gadget/
/config/usb_gadget/g1
/config/usb_gadget/g1/os_desc
/config/usb_gadget/g1/os_desc/b.1
/config/usb_gadget/g1/os_desc/qw_sign
/config/usb_gadget/g1/os_desc/b_vendor_code
/config/usb_gadget/g1/os_desc/use
/config/usb_gadget/g1/strings
/config/usb_gadget/g1/strings/0x409
/config/usb_gadget/g1/strings/0x409/serialnumber
/config/usb_gadget/g1/strings/0x409/product
/config/usb_gadget/g1/strings/0x409/manufacturer
/config/usb_gadget/g1/configs
/config/usb_gadget/g1/configs/b.1
/config/usb_gadget/g1/configs/b.1/f2
/config/usb_gadget/g1/configs/b.1/f1
/config/usb_gadget/g1/configs/b.1/strings
/config/usb_gadget/g1/configs/b.1/strings/0x409
/config/usb_gadget/g1/configs/b.1/strings/0x409/configuration
/config/usb_gadget/g1/configs/b.1/bmAttributes
/config/usb_gadget/g1/configs/b.1/MaxPower
/config/usb_gadget/g1/functions
/config/usb_gadget/g1/functions/ccid.ccid
/config/usb_gadget/g1/functions/ncm.0
/config/usb_gadget/g1/functions/ncm.0/ifname
/config/usb_gadget/g1/functions/ncm.0/qmult
/config/usb_gadget/g1/functions/ncm.0/host_addr
/config/usb_gadget/g1/functions/ncm.0/dev_addr
/config/usb_gadget/g1/functions/qdss.qdss
/config/usb_gadget/g1/functions/qdss.qdss/enable_debug_inface
/config/usb_gadget/g1/functions/gsi.dpl
/config/usb_gadget/g1/functions/gsi.dpl/info
/config/usb_gadget/g1/functions/gsi.rndis
/config/usb_gadget/g1/functions/gsi.rndis/info
/config/usb_gadget/g1/functions/gsi.rmnet
/config/usb_gadget/g1/functions/gsi.rmnet/info
/config/usb_gadget/g1/functions/cser.nmea.1
/config/usb_gadget/g1/functions/cser.nmea.1/status
/config/usb_gadget/g1/functions/cser.dun.0
/config/usb_gadget/g1/functions/cser.dun.0/status
/config/usb_gadget/g1/functions/diag.diag
/config/usb_gadget/g1/functions/ffs.adb
/config/usb_gadget/g1/functions/midi.gs5
/config/usb_gadget/g1/functions/midi.gs5/id
/config/usb_gadget/g1/functions/midi.gs5/out_ports
/config/usb_gadget/g1/functions/midi.gs5/in_ports
/config/usb_gadget/g1/functions/midi.gs5/qlen
/config/usb_gadget/g1/functions/midi.gs5/buflen
/config/usb_gadget/g1/functions/midi.gs5/index
/config/usb_gadget/g1/functions/accessory.gs2
/config/usb_gadget/g1/functions/ptp.gs1
/config/usb_gadget/g1/functions/ptp.gs1/os_desc
/config/usb_gadget/g1/functions/ptp.gs1/os_desc/interface.MTP
/config/usb_gadget/g1/functions/ptp.gs1/os_desc/interface.MTP/sub_compatible_id
/config/usb_gadget/g1/functions/ptp.gs1/os_desc/interface.MTP/compatible_id
/config/usb_gadget/g1/functions/mtp.gs0
/config/usb_gadget/g1/functions/mtp.gs0/os_desc
/config/usb_gadget/g1/functions/mtp.gs0/os_desc/interface.MTP
/config/usb_gadget/g1/functions/mtp.gs0/os_desc/interface.MTP/sub_compatible_id
/config/usb_gadget/g1/functions/mtp.gs0/os_desc/interface.MTP/compatible_id
/config/usb_gadget/g1/functions/mass_storage.0
/config/usb_gadget/g1/functions/mass_storage.0/lun.0
/config/usb_gadget/g1/functions/mass_storage.0/lun.0/nofua
/config/usb_gadget/g1/functions/mass_storage.0/lun.0/cdrom
/config/usb_gadget/g1/functions/mass_storage.0/lun.0/removable
/config/usb_gadget/g1/functions/mass_storage.0/lun.0/ro
/config/usb_gadget/g1/functions/mass_storage.0/lun.0/file
/config/usb_gadget/g1/functions/mass_storage.0/stall
/config/usb_gadget/g1/UDC
/config/usb_gadget/g1/bcdUSB
/config/usb_gadget/g1/bcdDevice
/config/usb_gadget/g1/idProduct
/config/usb_gadget/g1/idVendor
/config/usb_gadget/g1/bMaxPacketSize0
/config/usb_gadget/g1/bDeviceProtocol
/config/usb_gadget/g1/bDeviceSubClass
/config/usb_gadget/g1/bDeviceClass