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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

For example, we have

#define BTN_TRIGGER…………………………………0x120

I. e. the capability bit mask whether the device claims to have a BTN_TRIGGER is the 0x120th bit in capabilities/key, or IOW, the 32th bit in
  bit  256: 0C00000000000001

which is zero. Likewise there's no BTN_A, nor BTN_1. Interestingly there
*is* a BTN_MISC aka BTN_0:

#define BTN_MISC…………………………………………0x100
#define BTN_0…………………………………………………0x100

and the 0x100 == 256th bit in the above mask is 1. So it's not the
buttons, but the axes. We see from the abs mask  FFFFFF01000701FF that
the device claims to have all of ABS_X to ABS_GAS, and a whole lot of
others and even undefined ones. This may simply just be an uninitialized
value in the kernel driver?

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https://bugs.launchpad.net/bugs/1458631

Title:
  udev: /dev/input/js0 is created but no joystick attached

Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  Invalid

Bug description:
  With ubuntu vivid i see a /dev/input/js0. I do not have a joystick or
  gamepad attached. This invalid input device cause a game in steam
  "Crypt of the necrodancer" to crash during start. The game works fine
  when I delete it.

  This appears to be a ubuntu specific bug as it does not show up on
  fedora 22.

  It goes away if I unplug the mouse/keyboard usb dongle I use. If I
  attach a wired keyboard only it does not show up. I tried adding a
  wired mouse too, but that causes js0 to appear too. The output of
  udevadm changes depending on what mouse I have attached. The following
  output is from using the dongle for my wireless mouse/keyboard (both
  microsoft products)

  $sudo udevadm info /dev/input/js0
  P: /devices/pci0000:00/0000:00:1a.2/usb5/5-1/5-1:1.2/0003:045E:0745.0003/input/input7/js0
  N: input/js0
  S: input/by-id/usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v6.0-if02-joystick
  S: input/by-path/pci-0000:00:1a.2-usb-0:1:1.2-joystick
  E: DEVLINKS=/dev/input/by-id/usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v6.0-if02-joystick /dev/input/by-path/pci-0000:00:1a.2-usb-0:1:1.2-joystick
  E: DEVNAME=/dev/input/js0
  E: DEVPATH=/devices/pci0000:00/0000:00:1a.2/usb5/5-1/5-1:1.2/0003:045E:0745.0003/input/input7/js0
  E: ID_BUS=usb
  E: ID_FOR_SEAT=input-pci-0000_00_1a_2-usb-0_1_1_2
  E: ID_INPUT=1
  E: ID_INPUT_JOYSTICK=1
  E: ID_INPUT_KEY=1
  E: ID_INPUT_KEYBOARD=1
  E: ID_MODEL=Microsoft®_2.4GHz_Transceiver_v6.0
  E: ID_MODEL_ENC=Microsoft®\x202.4GHz\x20Transceiver\x20v6.0
  E: ID_MODEL_ID=0745
  E: ID_PATH=pci-0000:00:1a.2-usb-0:1:1.2
  E: ID_PATH_TAG=pci-0000_00_1a_2-usb-0_1_1_2
  E: ID_REVISION=0251
  E: ID_SERIAL=Microsoft_Microsoft®_2.4GHz_Transceiver_v6.0
  E: ID_TYPE=hid
  E: ID_USB_DRIVER=usbhid
  E: ID_USB_INTERFACES=:030101:030102:030000:
  E: ID_USB_INTERFACE_NUM=02
  E: ID_VENDOR=Microsoft
  E: ID_VENDOR_ENC=Microsoft
  E: ID_VENDOR_ID=045e
  E: MAJOR=13
  E: MINOR=0
  E: SUBSYSTEM=input
  E: TAGS=:seat:uaccess:
  E: USEC_INITIALIZED=117298

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