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

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Date:	Wed, 21 May 2014 16:22:52 +0200
From:	Elias Vanderstuyft <elias.vds@...il.com>
To:	Michal Malý <madcatxster@...oid-pointer.net>,
	Roland Bosa <rbosa@...itech.com>
Cc:	Simon Wood <simon@...gewell.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Anssi Hannula <anssi.hannula@....fi>
Subject: Re: [PATCH v4 01/24] input: Add ff-memless-next module

On Wed, May 21, 2014 at 3:35 PM, Elias Vanderstuyft <elias.vds@...il.com> wrote:
> On Wed, May 21, 2014 at 4:13 AM, Michal Malý
> <madcatxster@...oid-pointer.net> wrote:
>> Proper decoupling of the userspace and driver is the only important thing that
>> is missing from the current code.
>
> Also dynamic updating of periodic effects is not yet supported in
> "ff-memless-next".
> This can also be important in simulation games (=second type), e.g.
> the "rFactor" game.

Oh, and I forgot some other things that need to be mentioned:
- Trigger-button is not yet implemented, as far as I know
- Custom force effects, in Linux it is called FF_CUSTOM. (however I
think we can neglect this effect for now)
- Infinite iterations in the Linux FF API is not supported.

@Roland:
Now I understand why Logitech Windows drivers have bugs in the
periodic implementation of the DInput specs:
Logitech seems to have based their drivers on the Immersion Studio
visualisation of the to-be-generated periodic effects, and these
visualisations are not conform with the DInput specs of MSDN.
Take a quick look at the MSDN specs for e.g. SawtoothUp:
http://msdn.microsoft.com/en-us/library/windows/desktop/ee418719%28v=vs.85%29.aspx
Now open the Immersion Studio (demo) and create a standard SawtoothUp
effect, and look at the visualisation... It's wrong, right?
Same applies for SawtoothDown and Triangle.

Elias
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