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

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Date:	Wed, 14 May 2014 11:11:40 -0400
From:	simon@...gewell.org
To:	"Michal Malý" 
	<madcatxster@...oid-pointer.net>
Cc:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	jkosina@...e.cz, elias.vds@...il.com, anssi.hannula@....fi,
	simon@...gewell.org
Subject: Re: [PATCH v4 01/24] input: Add ff-memless-next module

> 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.

Simon.

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