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

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Message-ID: <d120d5000706120645w48f784cdt22c6c0a707166325@mail.gmail.com>
Date:	Tue, 12 Jun 2007 09:45:29 -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

On 6/12/07, Renato Golin <rengolin@...il.com> wrote:
> 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...
>

Yes, if correction was calculated for [127; 127] range and the device
would feed [0; 4096] it would of course produce wrong results.


>
> > 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.
>

Any change you could locate and run "evtest" utility and post its results?

> 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.
>

We do not want to fix only joydev as it leaves other nput handlers
(for example access through evdev) still broken. That's why I want to
figure out where [0;4096] is being changed to [-127; 127].

-- 
Dmitry
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