On Tue, May 19, 2020, at 2:51 PM, Krzysztof Opasiak wrote: > > > On 19.05.2020 21:40, Sid Spry wrote: > > On Tue, May 19, 2020, at 2:12 PM, Sid Spry wrote: > >> On Mon, May 18, 2020, at 6:58 PM, Peter Chen wrote: > >>> > >>>>> 2. Try exactly the same script I gave you, do not try change any > >>>>> charaters (except the position for your application) > >>>>> > >>>>>>> cd /sys/kernel/config/usb_gadget > >>>>>>> cd g1 > >>>>>>> echo "0x1d6b" > idVendor > >>>>>>> echo "0x0105" > idProduct > >>>>>>> mkdir /dev/usb-ffs > >>>>>>> mkdir functions/ffs.usb > >>>>>>> mount -t functionfs usb /dev/usb-ffs ln -s functions/ffs.usb > >>>>>>> configs/c.1 /home/root/usb_test/ffs_test/ffs-test & /* your own > >>>>>>> test application */ while [ ! -e /dev/usb-ffs/ep1 ] do echo "." > >>>>>>> sleep 1; > >>>>>>> done > >>>>> > >>>>>> > >>>>>> [1]: I actually did not have CONFIG_USB_CONFIGFS_F_FS nor F_NCM/ECM > >>>> set however the necessary code seemed to have been pulled in some other way > >>>> and the modules were available. They were loaded, and as explained my shell- > >>>> based configfs code worked. They are set now and the problem persists. > >>>>> > >>>> > >>>> Hi, sorry I was not clear. The kernel config is fine, and > >>>> CONFIG_USB_CONFIGFS_F_FS is set. I run your exact script (minus the ffs-test > >>>> line) and it fails to create the functions/ffs.usb directory as I described before. I can > >>>> create other functions just fine. > >>> > >>> You may enable debug at configfs.c, f_fs.c and your udc driver to see > >>> what happened. > >>> > >> > >> Thanks for your help Peter. Unfortunately I have hit a brick wall. The > >> examples in libusbgx also fail to work, and I tried that library after > >> a friend recommended it as perhaps having secret mojo. I enabled the > >> userspace debug helpers in the kernel but they do not seem to offer me > >> any insight, and there's no relevant dmesg output. > >> > >> My device is an Allwinner H2+, and the UDC seems to be the Inventra > >> Highspeed Dual Role Controller. I've also got the DesignWare USB3/USB2 > >> cores enabled from my upstream but I think they are not being loaded. > >> > >> If anyone can look I'd appreciate it, this is just a hobby project. > >> It's a good chance for me to do some kernel debugging but I'm a bit > >> lost. > >> > >> Thanks for the help so far. > >> > > > > Sorry for double post again. Alternatively, if anyone can recommend a device which they know has working ffs configfs gadget functionality, I'll just buy a board with that instead. > > Can you send me the strace log from the libusbgx example that does not > work for you? > I apologize for the anticlimax, but some minor option I changed seemed to gate the bug. It may have been that I compiled in the DWC controller's dual mode instead of leaving it as module and this claimed the UDC in some way? The DWC dual-mode was compiled in as it caused a compilation issue in an older kernel. I can now create the directory. Will get back if I can get the driver code working, the example references the linux source code in a strange way, haven't figured out how to add all headers.
