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SubjectRe: [PATCH] HID: add multi-input quirk for eGalax Touchcontroller
On Tue, Feb 02, 2010 at 10:44:35PM +0100, Jiri Kosina wrote:
> On Tue, 2 Feb 2010, Peter Hutterer wrote:
>
> > Nonetheless, I'm not sure about whether that's the right thing to do. With
> > this patch applied, it gives me two devices, one mute, the other one
> > announces BTN_PEN and BTN_TOUCH + abs axes, though only BTN_TOUCH is ever
> > triggered. Loading usbtouchscreen instead of usbhid for this device makes
> > the device look more sane BTN_TOUCH + abs axes but the actual data is
> > random. So I'm not quite sure what the fix is supposed to be, any hints are
> > appreciated if it's not the patch below.
>
> The data could also be mis-interpreted because of some bug in the HID
> descriptor.
>
> Does looking at the HID report descriptor and looking at the actual
> raw HID reports coming out from the device give any clue? (in recent
> kernels, you can just use 'hid' directory in debugfs to gather all this
> information).

Thanks. The hid descriptor table is attached, but tbh I'm not well-versed
enough in the HID protocol to even tell what format I can give you. I've
attached a simple hexdump of two presses, one with a finger, one with the
stylus. Let me know what format you need or what how I can start to decypher
this myself (are there any parsing tools around?).

Cheers,
Peter
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INPUT(1)[INPUT]
Field(0)
Physical(GenericDesktop.Pointer)
Usage(2)
Button.0001
Button.0002
Logical Minimum(0)
Logical Maximum(1)
Report Size(1)
Report Count(2)
Report Offset(0)
Flags( Variable Absolute )
Field(1)
Physical(GenericDesktop.Pointer)
Usage(2)
GenericDesktop.X
GenericDesktop.Y
Logical Minimum(42)
Logical Maximum(1981)
Physical Minimum(0)
Physical Maximum(4095)
Report Size(16)
Report Count(2)
Report Offset(8)
Flags( Variable Absolute )
INPUT(2)[INPUT]
Field(0)
Physical(Digitizers.Stylus)
Usage(2)
Digitizers.TipSwitch
Digitizers.InRange
Logical Minimum(0)
Logical Maximum(1)
Physical Minimum(0)
Physical Maximum(4095)
Report Size(1)
Report Count(2)
Report Offset(0)
Flags( Variable Absolute )
Field(1)
Physical(Digitizers.Stylus)
Usage(1)
GenericDesktop.X
Logical Minimum(30)
Logical Maximum(4040)
Report Size(16)
Report Count(1)
Report Offset(8)
Flags( Variable Absolute )
Field(2)
Physical(Digitizers.Stylus)
Usage(1)
GenericDesktop.Y
Logical Minimum(60)
Logical Maximum(4035)
Report Size(16)
Report Count(1)
Report Offset(24)
Flags( Variable Absolute )

Button.0001 ---> Key.LeftBtn
Button.0002 ---> Key.RightBtn
GenericDesktop.X ---> Absolute.X
GenericDesktop.Y ---> Absolute.Y
Digitizers.TipSwitch ---> Key.Touch
Digitizers.InRange ---> Key.ToolPen
GenericDesktop.X ---> Absolute.X
GenericDesktop.Y ---> Absolute.Y
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