Ajay, Quick question (as someone who has been down this road), do you need to do a kernel driver or could you just use the functionfs support to implement everything in userspace? I found that path to be much easier and less error-prone (and one of these days I'm going to be contributing some documentation changes to make some things clearer...) and I was able to get my IPP-USB implementation up and running very quickly. > On Sep 11, 2021, at 1:43 AM, Ajay Garg <ajaygargnsit@xxxxxxxxx> wrote: > > Hi All. > > As a first step, I have been able to load a gadget on configfs, which > binds to the function "gser" (thus loading up the usb_f_serial module > when the gadget mounts). Things work well till here. > > Now, I have written a brand-new gadget-side device-driver, trying to > create a new function "gusb", via DECLARE_USB_FUNCTION_INIT. > However, now when I try to load the gadget for binding to "gusb", I > get the error that the function cannot be found. > > Seems that firing up a new gadget-side driver, that registers a new > function via DECLARE_USB_FUNCTION_INIT, is not enough to make the new > function visible across the kernel. > > Kindly let know what I am missing. > Will be grateful for pointers. > > > Thanks and Regards, > Ajay > ________________________ Michael Sweet
