Re: [RFC PATCH 4/4] media: add gv-usb2 audio capture driver

[Colin Braun]

On Mon, Jul 13, 2026 at 04:44:24PM +0200, Danilo Krummrich wrote:
> On Sun Jul 12, 2026 at 11:08 PM CEST, Colin Braun wrote:
> > +/// Write a vendor-specific control register on the GV-USB2 device.
> > +///
> > +/// Uses a vendor-type control request (`REQ_WRITE_REG`) to write the
> > +/// given `value` to the given `reg` address.
> > +fn write_reg(intf: &usb::Interface<device::Bound>, reg: u16, value: u8) -> Result {
> 
> In addition to raw control messages, this can leverage the generic I/O backend
> infrastructure, so you don't have to roll your own write_reg() function and use
> the register!() infrastructure instead. See also [1] and [2].
> 
> [1] https://lore.kernel.org/driver-core/20260706-io_projection-v6-0-72cd5d055d54@xxxxxxxxxxx/
> [2] https://lore.kernel.org/lkml/DJVQ852J7SOH.26YBIJTQ9B66G@xxxxxxxxxx/
> 

Interesting, I had briefly glanced at this macro and was disappointed
that it didn't seem to apply well to my situation, but I see that the
Io and IoCapable traits are generic in a way that does support this.

I'll include this in my next revision, thank you!