Re: [PATCH] HID: add multi-input quirk for eGalax Touchcontroller

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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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0000020 726f 2074 2032 7328 7a69 2065 2936 3d20
0000030 0020 3020 0032 3020 0033 6120 0030 3020
0000040 0031 3120 0033 3020 0032 000a 6944 6967
0000050 6974 657a 7372 542e 7069 7753 7469 6863
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0000540 000a 6547 656e 6972 4463 7365 746b 706f
0000550 582e 3d2
05 01 09 01 a1 01 85 01 09 01 a1 00 05 09 19 01 29 02 15 00 25 01 95 02 75 01 81 02 95 01 75 06 81 01 05 01 09 30 09 31 16 2a 00 26 bd 07 36 00 00 46 ff 0f 66 00 00 75 10 95 02 81 02 c0 c0 05 0d 09 04 a1 01 85 02 09 20 a1 00 09 42 09 32 15 00 25 01 95 02 75 01 81 02 95 06 75 01 81 03 05 01 09 30 75 10 95 01 a4 55 00 65 00 36 00 00 46 00 00 16 1e 00 26 c8 0f 81 02 09 31 16 3c 00 26 c3 0f 36 00 00 46 00 00 81 02 b4 c0 c0 

  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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