linux-kernel - Re: [PATCH v4 01/24] input: Add ff-memless-next module

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Message-ID: <20140514175825.GA30089@core.coreip.homeip.net>
Date:	Wed, 14 May 2014 10:58:25 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	simon@...gewell.org
Cc:	"Michal Malý" 
	<madcatxster@...oid-pointer.net>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, jkosina@...e.cz, elias.vds@...il.com,
	anssi.hannula@....fi
Subject: Re: [PATCH v4 01/24] input: Add ff-memless-next module

On Wed, May 14, 2014 at 11:11:40AM -0400, simon@...gewell.org wrote:
> 
> > If we ever come across a really memoryless device it should not be
> > particularly difficult to add another callback to ff-memless-next which
> > would emulate conditional effects with constant force.
> 
> It should be noted that some (/many?) applications/games already use the
> CF with position feedback to emulate behaviour such as springs. The feed
> back loop is simply not fast enough to do emulation of friction/inertia.
> 
> I don't believe that the FF layer in the kernel should be 'tricked out'
> with lots of emulation features.
> 
> As a game designer (ok... tinkerer) it's a bit of a pain that devices lie
> about what they can really do - ie. gamepads claiming periodic ability
> when all they are doing is faking it with rumble.

Would it help if kernel would indicate which effects are native and
which are emulated?

Thanks.

-- 
Dmitry
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