HAL Pin Names for a Bone-Stock USB Mouse

I’ve always wondered what the LinuxCNC HAL pin names would be for an ordinary mouse, particularly nowadays when an Arduino Leonardo can become a USB HID gadget without much effort at all. If one had a Leonardo and l337 programming skillz, one might receive far more interesting data than just fast-twitch muscle movement…

Logitech Optical Mouse - LinuxCNC box
Logitech Optical Mouse – LinuxCNC box

So. We begin…

From less /proc/bus/input/devices:

... snippage ...
I: Bus=0003 Vendor=046d Product=c077 Version=0111
N: Name="Logitech USB Optical Mouse"
P: Phys=usb-0000:00:1d.0-1/input0
S: Sysfs=/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0/input/input10
U: Uniq=
H: Handlers=mouse3 event10
B: EV=17
B: KEY=ff0000 0 0 0 0 0 0 0 0
B: REL=143
B: MSC=10

From ll /dev/input:

... snippage ...
crw-r-----   1 root root 13, 74 2013-02-23 07:46 event10
... snippage ...
crw-r-----   1 root root 13, 35 2013-02-23 07:46 mouse3

Manually beat the permissions into shape, because this is a one-off affair:

sudo chgrp users /dev/input/event10
sudo chgrp users /dev/input/mouse3
sudo chmod g+w /dev/input/event10
sudo chmod g+w /dev/input/mouse3

Find the USB address from lsusb:

Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 006: ID 06f2:0011 Emine Technology Co. KVM Switch Keyboard
Bus 004 Device 005: ID 046d:c401 Logitech, Inc. TrackMan Marble Wheel
Bus 004 Device 004: ID 04d9:1203 Holtek Semiconductor, Inc. MC Industries Keyboard
Bus 004 Device 003: ID 046d:c216 Logitech, Inc. Dual Action Gamepad
Bus 004 Device 002: ID 0451:2046 Texas Instruments, Inc. TUSB2046 Hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 046d:c077 Logitech, Inc.
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Query the attributes with udevadm:

udevadm info --query=all --attribute-walk --name=/dev/bus/usb/002/002
... snippage ...
  looking at device '/devices/pci0000:00/0000:00:1d.0/usb2/2-1':
    ATTR{bNumInterfaces}==" 1"
    ATTR{bMaxPower}==" 98mA"
    ATTR{version}==" 2.00"
    ATTR{product}=="USB Optical Mouse"

Fire up halrun, load hal_input, and dump the pins:

halcmd: loadusr -W hal_input -KRAL Optical
halcmd: show all
Loaded HAL Components:
ID      Type  Name                                      PID   State
     5  User  hal_input                                  1693 ready
     3  User  halcmd1692                                 1692 ready

Component Pins:
Owner   Type  Dir         Value  Name
     5  bit   OUT         FALSE  input.0.btn-back
     5  bit   OUT          TRUE  input.0.btn-back-not
     5  bit   OUT         FALSE  input.0.btn-extra
     5  bit   OUT          TRUE  input.0.btn-extra-not
     5  bit   OUT         FALSE  input.0.btn-forward
     5  bit   OUT          TRUE  input.0.btn-forward-not
     5  bit   OUT         FALSE  input.0.btn-middle
     5  bit   OUT          TRUE  input.0.btn-middle-not
     5  bit   OUT         FALSE  input.0.btn-mouse
     5  bit   OUT          TRUE  input.0.btn-mouse-not
     5  bit   OUT         FALSE  input.0.btn-right
     5  bit   OUT          TRUE  input.0.btn-right-not
     5  bit   OUT         FALSE  input.0.btn-side
     5  bit   OUT          TRUE  input.0.btn-side-not
     5  bit   OUT         FALSE  input.0.btn-task
     5  bit   OUT          TRUE  input.0.btn-task-not
     5  s32   OUT             0  input.0.rel-hwheel-counts
     5  float OUT             0  input.0.rel-hwheel-position
     5  bit   IN          FALSE  input.0.rel-hwheel-reset
     5  float IN              1  input.0.rel-hwheel-scale
     5  s32   OUT             0  input.0.rel-wheel-counts
     5  float OUT             0  input.0.rel-wheel-position
     5  bit   IN          FALSE  input.0.rel-wheel-reset
     5  float IN              1  input.0.rel-wheel-scale
     5  s32   OUT             0  input.0.rel-x-counts
     5  float OUT             0  input.0.rel-x-position
     5  bit   IN          FALSE  input.0.rel-x-reset
     5  float IN              1  input.0.rel-x-scale
     5  s32   OUT             0  input.0.rel-y-counts
     5  float OUT             0  input.0.rel-y-position
     5  bit   IN          FALSE  input.0.rel-y-reset
     5  float IN              1  input.0.rel-y-scale
... snippage ...

Hmmm, that was interesting…

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