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?
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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