[Bug 22059] New: when /dev/input/event* device is accessible, wine fails to consider calibration and correction factors of the linux joydev driver

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=22059

           Summary: when /dev/input/event* device is accessible, wine
                    fails to consider calibration and correction factors
                    of the linux joydev driver
           Product: Wine
           Version: 1.1.40
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-dinput
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: corvus-wine at cybertrench.com


Created an attachment (id=26862)
 --> (http://bugs.winehq.org/attachment.cgi?id=26862)
joydev log with event file accessible

Linux provides the possibility to correct joystick raw values automatically
when accessing /dev/input/js* devices, both autodetected/scaled and
"hand-calibrated" with tools like "jscal"

if wine uses /dev/input/js* for joystick access, it also takes the correction
factors into account, so a joystick that has been calibrated under linux, will
be calibrated correctly under wine.

However if the /dev/input/event* file corresponding to the joystick device is
accessible (at least for reading) wine seems to bypass the joydev driver and
accesses the device on a lower (event) level, thus unaware of the calibration
data and correction factors - whether manually set and autodetected!

As a result programs run under wine that use a joystick but offer no inbuilt
calibration option (which is most, since under native win32 joysticks are
calibrated system wide in the input device area of the control center) will
behave strangely as joysticks are potentially off-centered - mis-scaled - axis
flipped - or even unable to cross the zero position at all.
Depending on the actual joystick hardware and the required corrections.

the attached log1.txt shows the output of a joystick using program (il2fb
flightsim) started with dinput WINEDEBIUG output grep'd for "joydev" when the
event device is accessible (and the joystick is unusable due to miscalibration

> WINEDEBUG=+dinput wine il2fb.exe 2>&1 |grep joydev

log2.txt shows the same output with /dev/input/event5 (the joystick event
device) chmodded to 000

in this case the axis and buttons are mapped completely different, but centered
and scaled correctly (given that the jopystick had been calibrated under linux
using jscal)


for obvious reasons this bug is only visible if the axis values reported by the
event device, especially min and max:
...
> cur=97, min=0, max=255, fuzz=0, flat=15
...

are not equal to the actually reachable minimum and maximum values.
newer joysticks often autoscale in hard/firmware and actually reach those
min/max values with little need for calibration, while some, especially older
models, are in dire need of correction values since the actual range (as in
this case) is more like 30 to 120

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