Hi, all,
I'm playing with USB gadget with configfs on raspberry pi zero w. My
goal is to setup a generic functionfs function that uses Windows OS
descriptor so that windows would automatically install winusb driver.
It seems I would have to
- enable MS-specific os descriptor
- specify the compatiblity id to be "WINUSB"
- specify interface GUID (optional?)
It seems simple enough.
However, the first problem I'm having is that I can't find the
os_desc/ directory for the ffs function I created. If, following
other example, I create a RNDIS function, then everything seems to be
right. See the console output below.
Did I do anything wrongly? Is my goal achievable?
Many thanks.
Jun
======================
root@raspberrypi:/sys/kernel/config/usb_gadget/g1# cat os_desc/use
1
root@raspberrypi:/sys/kernel/config/usb_gadget/g1# tree functions/
functions/
├── ffs.usb0
└── rndis.usb0
├── dev_addr
├── host_addr
├── ifname
├── os_desc
│ └── interface.rndis
│ ├── compatible_id
│ └── sub_compatible_id
└── qmult
4 directories, 6 files
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