On Fri, Jan 18, 2013 at 5:56 PM, Hartmut Knaack <[email protected]> wrote:
> Hi,
> I've built myself a joystick adapter (project website:
> http://www.hexagons.de/index.php/USB_Joystickadapter), which has the purpose
> of connecting up to 2 Atari style joysticks (the ones with db9 connectors,
> found on 80's home computers like C64, Amiga,...) via USB. Current situation
> is: on Windows XP, 2 joystick devices get created with 2 axis and 2 buttons
> each (as intended); while on Linux, just one joystick device (/dev/input/js0)
> gets created, but with 4 axis and 4 buttons.
> This device provides one interface with one Interrupt-in Endpoint. The
> division into two joystick devices is done using an HID descriptor [1] with
> two configurations and the REPORT_ID tag.
> What I would like to know is, is there a problem in the Linux HID parser, or
> is its behavior intentional and those composite devices more like a dirty
> solution around the standards?
Hi,
well, currently, the HID parser does not split the different reportID
into several devices. It's a known limitation and we are working on it
(at least we already saw problems with that), but it will not make it
in 3.9 I think.
The solution that works for now is to use several usb interfaces. The
usb layer splits the different interfaces, so it will give you 2
different HID devices.
Oh, and if you want to contribute to split the device in the HID
parser under Linux, you are welcome as well :)
Cheers,
Benjamin
> Thanks
>
> Hartmut Knaack
>
> [1]
> char usbHidReportDescriptor[102] PROGMEM = {
>
> // Joystick Port 1
>
> 0x05, 0x01, // USAGE_PAGE (Generic Desktop)
> 0x09, 0x04, // USAGE (Joystick)
> 0xa1, 0x01, // COLLECTION (Application)
> 0x85, 0x01, // REPORT_ID (1)
> 0x09, 0x01, // USAGE (Pointer)
> 0xa1, 0x00, // COLLECTION (Physical)
> 0x09, 0x30, // USAGE (X)
> 0x09, 0x31, // USAGE (Y)
> 0x15, 0x00, // LOGICAL_MINIMUM (0)
> 0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
> 0x75, 0x08, // REPORT_SIZE (8)
> 0x95, 0x02, // REPORT_COUNT (2)
> 0x81, 0x02, // INPUT (Data,Var,Abs)
> 0xc0, // END_COLLECTION
> 0x05, 0x09, // USAGE_PAGE (Button)
> 0x19, 0x01, // USAGE_MINIMUM (Button 1)
> 0x29, 0x02, // USAGE_MAXIMUM (Button 2)
> 0x15, 0x00, // LOGICAL_MINIMUM (0)
> 0x25, 0x01, // LOGICAL_MAXIMUM (1)
> 0x75, 0x01, // REPORT_SIZE (1)
> 0x95, 0x02, // REPORT_COUNT (2)
> 0x81, 0x02, // INPUT (Data,Var,Abs)
> 0x75, 0x06, // REPORT_SIZE (6)
> 0x95, 0x01, // REPORT_COUNT (1)
> 0x81, 0x03, // INPUT (Constant,Var,Abs)
> 0xc0, // END_COLLECTION
>
> // Joystick Port 2
>
> 0x05, 0x01, // USAGE_PAGE (Generic Desktop)
> 0x09, 0x04, // USAGE (Joystick)
> 0xa1, 0x01, // COLLECTION (Application)
> 0x85, 0x02, // REPORT_ID (2)
> 0x09, 0x01, // USAGE (Pointer)
> 0xa1, 0x00, // COLLECTION (Physical)
> 0x09, 0x30, // USAGE (X)
> 0x09, 0x31, // USAGE (Y)
> 0x15, 0x00, // LOGICAL_MINIMUM (0)
> 0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
> 0x75, 0x08, // REPORT_SIZE (8)
> 0x95, 0x02, // REPORT_COUNT (2)
> 0x81, 0x02, // INPUT (Data,Var,Abs)
> 0xc0, // END_COLLECTION
> 0x05, 0x09, // USAGE_PAGE (Button)
> 0x19, 0x01, // USAGE_MINIMUM (Button 1)
> 0x29, 0x02, // USAGE_MAXIMUM (Button 2)
> 0x15, 0x00, // LOGICAL_MINIMUM (0)
> 0x25, 0x01, // LOGICAL_MAXIMUM (1)
> 0x75, 0x01, // REPORT_SIZE (1)
> 0x95, 0x02, // REPORT_COUNT (2)
> 0x81, 0x02, // INPUT (Data,Var,Abs)
> 0x75, 0x06, // REPORT_SIZE (6)
> 0x95, 0x01, // REPORT_COUNT (1)
> 0x81, 0x03, // INPUT (Constant,Var,Abs)
> 0xc0 // END_COLLECTION
> };
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