linux-kernel - Re: [RFC PATCH] gpio: sysfs: make the sysfs export behavior consistent

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Message-ID: <20240930075543.GB57004@rigel>
Date: Mon, 30 Sep 2024 15:55:43 +0800
From: Kent Gibson <warthog618@...il.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFC PATCH] gpio: sysfs: make the sysfs export behavior
 consistent

On Mon, Sep 30, 2024 at 09:20:48AM +0200, Bartosz Golaszewski wrote:
> On Mon, Sep 30, 2024 at 3:03 AM Kent Gibson <warthog618@...il.com> wrote:
> >
> > > I decided to write a sysfs-to-libgpiod compatibility layer based on
> > > FUSE. Since Rust is hard, I started prototyping the thing in python
> > > first to at least have the logic nailed down before I tackle the rust
> > > part.
> > >
> >
> > Something along these lines[1]?
> >
> > Cheers,
> > Kent.
> >
> > [1]https://dev.to/krjakbrjak/simulating-gpio-sysfs-interface-with-fuse-and-c-30ga
> >
>
> Well, this doesn't really do anything. I'm thinking about something
> consuming the libgpiod rust bindings to actually be a useful
> replacement for kernel sysfs.
>

I haven't actually looked at that - but when you mentioned a sysfs fuse
interface that rang a bell.

> The master plan is: provide a drop-in user-space replacement for
> sysfs, make users convert to using it instead of the real thing,
> eventually remove sysfs from the kernel and then some time after
> remove the compatibility layer from existence forcing everybody to now
> move to pure libgpiod. :)
>

Ironically a lot of users would probably be happier with that than with
the D-bus daemon.  And for that reason I don't think that last step will
ever happen.  But that is ok too - as long as we can finally remove the
sysfs interface from the kernel.

Cheers,
Kent.