Re: [PATCH 2/2] samples: rust: add a USB driver sample

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Sep 09, 2025 at 09:12:21AM -0300, Daniel Almeida wrote:
> Greg,
> 
> > On 9 Sep 2025, at 08:19, Simon Neuenhausen <simon.neuenhausen@rwth-aachen.de> wrote:
> > 
> > Hi,
> > 
> >> On 06.09.25 17:46, Daniel Almeida wrote:
> > 
> >> As I said to Greg above, I’m here to help if anyone wants to write a USB driver. Those interested
> > are free to reach out to me and we will work together to merge the required abstractions with a real user in mind. Hopefully this encourages others to join in this work :)
> > I had planned on writing a USB driver for TI nspire calculators, that would make them mountable as USB mass storage devices, since they use a proprietary USB protocol, that usually requires paid software from TI. At the time I gave up on that, due to the lack of USB support in RFL, but I could revive the effort using this.
> > 
> > I'll admit that this is pretty gimmicky, but if it helps to get this merged, I would be happy to do it.
> > 
> > Greetings
> > 
> > Simon Neuenhausen
> 
> We apparently have a user :)

No, this will not work as a kernel driver, it needs to be done in
userspace as the complexity involved would be crazy to be in the
kernel, it would be much simpler as a libusb program.

> Would you be ok if I continue this work? I can look into gadget zero as you and
> Alan said.

Sure, but again, we need a real user before I'll be able to take this.

USB's "problem" is that for any non-class device, it should be done as a
userspace program and not a kernel driver.  It's simpler that way, more
secure, and easier to debug and support.  The number of "new" USB
devices out there that need a new kernel driver for it has been very
very low for the past 15+ years.

thanks,

greg k-h