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

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Message-ID: <d9b9d95f0706120631l20e6f91duaa110e72a0e955a6@mail.gmail.com>
Date:	Tue, 12 Jun 2007 14:31:49 +0100
From:	"Renato Golin" <rengolin@...il.com>
To:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
Cc:	"Jiri Kosina" <jkosina@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: joydev.c and saitek cyborg evo force

On 12/06/07, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> 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

Hi Dmitry,

That's the values I got *after* calibration. Before, because the
correction is set to a small signed value, it corrects wrongly and
report a random mix of signed and unsigned values when moving in one
direction...

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

At joydev_connect, the last parameter "input_dev" reports me that
range (dev->absmax[i] and dev->absmin[i]). When I turned on HID_DEBUG
it reported [0, 4096] for both axis 0 and 1, which is correct so it
must be between HID and joydev.

My point is that the auto-calibration could automagically solve all
range problems in all devices by zeroing the range and adapting the
ranges afterwards. If it can affect other devices as well as
joysticks, the calibration could happen in HID instead of joydev.

cheers,
--renato

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