[PATCH libevdev 1/4] Add a doxygen page listing the ioctls and their current support

[Peter Hutterer]

On Fri, Dec 06, 2013 at 11:23:27AM +0100, David Herrmann wrote:
> Hi
> 
> On Thu, Dec 5, 2013 at 10:37 PM, Peter Hutterer
> <peter.hutterer at who-t.net> wrote:
> > On Thu, Dec 05, 2013 at 06:13:07PM +0100, David Herrmann wrote:
> >> Hi
> >>
> >> Patch looks good, but besides ioctls, we also lack proper write()
> >> support.
> >
> > can you extend on this - what support do we need here?
> 
> Well, any event can be written to an evdev device if you can read()
> it. It usually doesn't make much sense but can be used to overwrite
> driver values across all evdev readers. But I'm fine with not
> supporting this unless we have a proper use-case.

fwiw, I've used this in the past for testing where I just emulate an event
sequence on the physical device instead of the uinput device so there are
use-cases. writing a wrapper for this would be a relatively trivial task.

> However, there are a bunch of events which require write() support:
>  - EV_PWR
>  - REP_*
>  - SND_*
> And most important, all of the FF things require write() support. With
> current libevdev, FF is not supported at all and users need to do all
> the heavy lifting themselves (which is fine to me, but it's not
> documented at all).

yeah, I'm aware of the FF-stuff missing but that's likely going to stay that
way past the 1.0 release unless someone steps up to do it. I'll hack up a
documentation bit that at least states that.

Cheers,
   Peter