I want to access a Logitech Dual Action game pad via libusb. When
I examine this device connected to a Mac, the HIDExplorer shows
15 "elements" and indeed there are 15 controls (button or joy stick
axis). Setting the explorer to each and pressing/moving it shows
just the output one would expect (buttons go from 0 to 1 and a joystick
axis goes from 0 to 255 with 127 being the center). So far so good.
But on linux a lsusb of this device does not seem to show anything
similar. I see no entry where there are 15 of anything. So I'm
looking for pointers as to how to access the various buttons etc via
libusb. lsusb shows:
Bus 005 Device 004: ID 046d:c216 Logitech Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 Interface
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x046d Logitech Inc.
idProduct 0xc216
bcdDevice 1.25
iManufacturer 1 Logitech
iProduct 2 Logitech Dual Action
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 34
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 30mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Devices
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 88
cannot get report descriptor
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 6
bInterval 10
Language IDs: (length=4)
0409 English(US)
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