joystick(4) Kernel Interfaces Manual joystick(4)
NAME
joystick - Joystick input driver
SYNOPSIS
Snipped for xorg.conf.d(5):
Section "InputClass"
Identifier "joystick-all"
Driver "joystick"
Option "MatchIsJoystick" "on"
Option "MatchDevicePath "/dev/input/event*"
...
EndSection
DESCRIPTION
joystick is an Xorg input driver for Joysticks. There are 3 backends available that are used in the following order, if support was found:
- Linux's evdev interface
- Linux's joystick interface
- BSD's usbhid interface
The driver reports cursor movement as well as raw axis values through valuators.
SUPPORTED HARDWARE
In general, every by the kernel supported joystick should be supported through the joystick driver. The driver assumes that the joystick is
calibrated and reports axis values between -32768 and 32768. See the Linux kernel documentation for a complete list of supported devices.
CONFIGURATION DETAILS
Please refer to xorg.conf(5) for general configuration details. This section only covers configuration details specific to this driver.
The following Driver Options are supported:
Option "Device" "string"
Option "Path" "string"
Specifies the device through which the joystick can be accessed. This option is mandatory and there is no default setting.
For Linux, joysticks are mostly accessible as /dev/input/jsX or /dev/input/eventX.
In *BSD, joysticks are usually recognized as /dev/uhidX.
Option "AutoRepeat" "delay rate"
Sets the auto repeat behaviour for key events. delay is the time in milliseconds before a key starts repeating. rate is the number
of times a key repeats per second. Default: Xorg default
Option "DebugLevel" "integer"
If compiled with debugging information, controls the verbosity of the driver. The higher the DebugLevel, the more output is pro-
duced. Default: 0
Option "MapButton<number>" "string"
Sets the mapping of the joystick button to the desired action. Counting of buttons starts with 1, Possible options are:
none This joystick button won't do anything.
"button=<number>"
The joystick button will generate a click with the specified button (starting with 1).
"axis=[<factor>]<axis>"
Where <axis> is one of: x, y, zx, zy
and <factor> is an optional amplifier of the axis, like -, +, -5, 0.4, 1.3, ... Use positive and negative values to control
the direction. Default: 1.0
"amplify=<factor>"
Amplifies the movement of all axes by the given factor when pressed. Different factors can be combined.
"key=<scancode>[,<scancode>[,<scancode>[,<scancode>]]]
When button is pressed, a series of keydown events with the specified scancode is generated. When the button is released,
keyup events in the opposite order are generated. You can specify up to 4 scancodes per button.
See special section about key events below.
"disable-mouse"
"disable-keys"
"disable-all"
Disables either the generation of mouse events, key events or the generation of all X events by the driver. Press button
again to allow the driver to generate events again.
Option "MapAxis<number>" "string"
Sets the mapping of the axis to the desired action. Counting of axes starts with 1, the parameter may contain:
"mode=<string>"
Where <string> can be one of:
none, relative, accelerated, absolute
"valuator"
Send extra valuator events for this axis. The valuators will be numbered ascending, starting with 2 (valuator 0 and 1 are
reserved for pointer movement). The range of the valuators is always -32767 to 32768. Neither mode nor axis needs to be set
to generate extra valuator events. The axis will be labelled according to it's physical axis number, beginning with 1 , i.e.
"Axis 1" for the first axis (being the 3rd valuator). Default: not set.
"axis=[<factor>]<axis>"
Where <axis> is one of: x, y, zx, zy, key (see keylow/keyhigh)
and <factor> is an optional amplifier of the axis, like -, +, -5, 0.4, 1.3, ... Negative values will invert the movement.
Default: 1.0
"keylow= <scancode>[,<scancode>[,<scancode>[,<scancode>]]]
"keyhigh=<scancode>[,<scancode>[,<scancode>[,<scancode>]]]
When the axis is moved out of the deadzone, a series of keydown events according to the direction of the movement is gener-
ated. When the axis is released, keyup events will be generated. You can specify up to 4 scancodes for each direction.
keylow defines the keys to be generated when the axis is moved in negative direction (ie. left or up), keyhigh defines the
keys to be generated when the axis is moved in positive direction (ie. right or down).
If mode is set to relative: The driver will emulate autorepeat according to the current value of the axis. A keydown and sub-
sequent keyup event will be generated in short time intervals. To modify that interval and the autorepeat speed, supply the
"axis=[<factor>]KEY" parameter.
If mode is set to accelerated: Keydown and keyup events will be generated repeatedly. The time between a keydown and a keyup
event corresponds to the deflection of the axis. If the axis is deflected by 30%, the key will be considered to be down
300ms out of 1 second. The exact intervals may vary and can be adjusted with the amplify parameter. If the axis is deflected
by 100%, there will only be one keydown event, so the key is considered down all the time. The keys will be autorepeated
according to the Xorg keyboard settings.
See special section about key events below.
"deadzone=<number>"
Sets the unresponsive range of the axis to <number>. This can be between 0 and 30000. Default: 5000
Option "StartKeysEnabled" "boolean"
Set to False to disable key event generation after startup. You can toggle key event generation with the disable-keys button map-
ping. Default: enabled
Option "StartMouseEnabled" "boolean"
Set to False to disable mouse event generation after startup. You can toggle mouse event generation with the disable-mouse button
mapping. Default: enabled
DEFAULT CONFIGURATION
The default configuration is as follows:
Option "DebugLevel" "0"
Option "StartKeysEnabled" "True"
Option "StartMouseEnabled" "True"
Option "MapButton1" "button=1"
Option "MapButton2" "button=2"
Option "MapButton3" "button=3"
Option "MapButton4" "none"
...
Option "MapAxis1" "mode=relative axis=+1x deadzone=5000"
Option "MapAxis2" "mode=relative axis=+1y deadzone=5000"
Option "MapAxis3" "mode=relative axis=+1zx deadzone=5000"
Option "MapAxis4" "mode=relative axis=+1zy deadzone=5000"
Option "MapAxis5" "mode=accelerated axis=+1x deadzone=5000"
Option "MapAxis6" "mode=accelerated axis=+1y deadzone=5000"
Option "MapAxis7" "mode=none"
...
ACCELERATED AXIS CONFIGURATION
Accelerated mode should be selected, if the axis is a pad, which reports only three states: negative, center, positive. It will produce a
smooth acceleration of the movement when the axis is deflected. The speed will be affected by the factor of the axis, but not the accelera-
tion speed.
This example will set up the axis as scrolling vertically inverted, which half of the speed:
Option "MapAxis1" "mode=accelerated axis=-0.5zy"
This example maps four buttons to the four half axes, so you can use them like a pad. The movement will get half the normal speed:
Option "MapButton1" "axis=+0.5x"
Option "MapButton2" "axis=-0.5x"
Option "MapButton3" "axis=+0.5y"
Option "MapButton4" "axis=-0.5y"
ABSOLUTE AXIS CONFIGURATION
With the absolute axis mode, the position of the cursor will be fixed to the position, according to the deflection of the axis. This fixed
position is calculated around the previous position of the cursor. You can specify the range in pixels, the cursor can move. The default
range is the width of the screen, when mapped to the x-axis and the height of the screen, when mapped to the y-axis. This mode can be com-
bines with the other modes without problems.
In this example the first axis gets a range from left to the right of the screen. The second axis gets a total range of 200 pixels, 100 to
the top and 100 to the bottom:
Option "MapAxis1" "mode=absolute axis=x"
Option "MapAxis2" "mode=absolute axis=200y"
GENERATING KEY EVENTS
Providing a "key=<scancode>[,<scancode>[...]]" option will generate X Events with the specified scancodes when the joystick button is
pressed or the axis changed it's position. When the button/axis is released, the keys are released in the reverse order.
To lookup keycodes for KeySyms, you can use xmodmap -pk. You can use unused keycodes and map them to a KeySym of your choice using
xmodmap(1).
You can specify up to 4 scancodes per joystick button/axis, which is useful to use modificators. Make sure you use modificators that are
necessary to get a certain keysym.
Examples:
Option "MapButton1" "key=64,23"
will generate Alt_L+Tab when the button is pressed.
Option "MapButton1" "key=50,40"
will generate a Shift_L+d which will be an uppercase d.
Option "MapButton1" "key=65"
is for the space key.
Option "MapAxis1" "mode=relative keylow=113 keyhigh=114 axis=0.5key"
Option "MapAxis2" "mode=relative keylow=111 keyhigh=116"
Option "MapAxis3" "mode=accelerated keylow=113 keyhigh=114"
Option "MapAxis4" "mode=accelerated keylow=111 keyhigh=116"
will map the first and third axis to the arrow keys left and right and the second and fourth axis to the arrow keys up and down. The keys
for the first two axes will be generated in an interval according to the value of the axis. The autorepeat speed of the first axis will be
half the speed of that of the second axis. The keys for the third and fourth axis are generated once when the axis moves out of the dead-
zone and when it moves back into the deadzone. X.Org will autorepeat those keys according to current keyboard settings.
XI2 Events
If you only care about raw events instead of using the joystick as a mouse replacement, don't forget to unmap and add valuators to all axes
and map the remaining buttons:
Option "MapAxis1" "mode=none valuator"
Option "MapAxis2" "mode=none valuator"
Option "MapAxis3" "mode=none valuator"
Option "MapAxis4" "mode=none valuator"
...
Option "MapButton1" "button=1"
Option "MapButton2" "button=2"
Option "MapButton3" "button=3"
Option "MapButton4" "button=4"
Option "MapButton5" "button=5"
...
You might also want to set the device "floating" to stop it from reporting core events:
Option "Floating" "true"
NOTES
Configuration through InputClass sections is recommended in X servers 1.8 and later. See xorg.conf.d(5) for more details. An example
xorg.conf.d snipped is provided in ${sourcecode}/config/50-joystick-all.conf
Configuration through hal fdi files is recommended in X servers 1.5, 1.6 and 1.7. An example hal policy file is still provided in ${source-
code}/config/50-x11-input-joystick.fdi to be placed in /etc/hal/fdi/policy.
SEE ALSO
Xorg(1), xorg.conf(5), xorg.conf.d(5), Xserver(1), X(7), xmodmap(1)
AUTHORS
Sascha Hlusiak (2007-2011),
Frederic Lepied (1995-1999)
X Version 11 xf86-input-joystick 1.6.1 joystick(4)