linux-kernel - Re: [RFC 1/2] Input: ff, add FF

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Date:	Thu, 19 Apr 2007 00:58:10 -0400
From:	Dmitry Torokhov <dtor@...ightbb.com>
To:	johann deneux <johann.deneux@...il.com>
Cc:	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	stenyak@...il.com, linux-input@...ey.karlin.mff.cuni.cz
Subject: Re: [RFC 1/2] Input: ff, add FF_RAW effect

Hi,

On Thursday 19 April 2007 00:25, johann deneux wrote:
> On 4/18/07, Jiri Slaby <jirislaby@...il.com> wrote:
> > johann deneux napsal(a):
> > > Jiri,
> > >
> > > Which solution did you chose to implement? From what I remember, we
> > > last discussed Dmitry's idea of specifying an axis for an effect, then
> > > combine several effects to achieve complex effects.
> >
> > I think you mean motor instead of axis, because I don't push real axes to
> > the devices, but motor's torques...
> >
> 
> Yes, sorry, I meant motor.
> 

I have been thinking about this and I don't think that exporting motor
data is a good idea, at least not in case of Phantom driver. The fact
that there are 3 motors is a hardware implementation detail and it
is not interesting for general application.

My understanding that the end result of controlling these 3 motors
is a force vector (I don't know if there is such english term, this
is a literal translation from russian) applied to user's hand.
If we are interested in using FF API we need to come up with a way
to express this effect without exposing implementation details of
one particular device.

-- 
Dmitry
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