linux-kernel - Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]

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Message-ID: <d120d5000703140802jb48bc74tbbe7ee2b120b1798@mail.gmail.com>
Date:	Wed, 14 Mar 2007 11:02:37 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Jiri Slaby" <jirislaby@...il.com>
Cc:	"johann deneux" <johann.deneux@...il.com>,
	"Linux kernel mailing list" <linux-kernel@...r.kernel.org>,
	linux-input@...ey.karlin.mff.cuni.cz,
	"Anssi Hannula" <anssi.hannula@...il.com>
Subject: Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]

On 3/13/07, Jiri Slaby <jirislaby@...il.com> wrote:
> Why did you remove all Cced people? Anyway I filtered some of them out
>
> johann deneux napsal(a):
> > You are right, the direction in ff_effect is meant to be an angle.
> > A dirty solution would be to use the 16 bits as two 8-bits angles. Or
>
> That would be a problem as I need 3x 16bits.
>
> > maybe we should change the API. I don't think there are many
> > applications using force feedback yet, so maybe that should be ok?
> >
> > If we change the API, we should remove the assumption that a device has
> > at most two axes to render effects. We could for instance have a
> > magnitude argument for each axis which is capable of rendering effects.
> > That might be necessary even for more common gaming devices like racing
> > wheels: One can think pedals could also be capable of force feedback
> > some day, not just the steering wheel.
>
> I can do that, but in that case, I need to know how people (especially those
> input one) want me to do...
>

Since we have no idea how many programs (if any) are using force
feedback interface I would be wary of changing existing effcets and
rather add new set of 3D effects.

Do we have any idea if there any users of FF out there?

-- 
Dmitry
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