linux-kernel - Re: joydev.c and saitek cyborg evo force

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Message-ID: <d120d5000706120613o7a328e59v3cba37f0ced88e77@mail.gmail.com>
Date:	Tue, 12 Jun 2007 09:13:06 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Renato Golin" <rengolin@...il.com>
Cc:	"Jiri Kosina" <jkosina@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: joydev.c and saitek cyborg evo force

Hi Renato,

On 6/12/07, Renato Golin <rengolin@...il.com> wrote:
> On 12/06/07, Jiri Kosina <jkosina@...e.cz> wrote:
> > the thing is that the aim of this quirk is to normalize the values that
> > are being reported by bogus devices, so we don't really want to trust the
> > values they provide here, do we?
>
> Hi Jiri,
>
> I don't know about the other joysticks, but Saitek did reported [0,
> 4096] which is the right answer, but between HID and Joydev it was
> converted to [-127, 127]. I thought that the quirk was about that.
>

We need to find out why you see [-127, 127] range, because if joydev
would see [0, 4096] range it would perform automatic correction and
map values like this:

c0: 2048, c1: 2048, c2: 262144, c3: 262144
0 -> -32768
204 -> -29504
408 -> -26240
612 -> -22976
816 -> -19712
1020 -> -16448
1224 -> -13184
1428 -> -9920
1632 -> -6656
1836 -> -3392
2040 -> -128
2244 -> 3136
2448 -> 6400
2652 -> 9664
2856 -> 12928
3060 -> 16192
3264 -> 19456
3468 -> 22720
3672 -> 25984
3876 -> 29248
4080 -> 32512

Which is fine as far as I can see. What utility did you use that
reported [-127; 127] range?

-- 
Dmitry
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