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.\" shorthand for double quote that works everywhere.
.ds q \N'34'
.TH EVDEV __drivermansuffix__ __vendorversion__
.SH NAME
evdev \- Generic Linux input driver
.SH SYNOPSIS
.nf
.B "Section \*qInputDevice\*q"
.BI " Identifier \*q" devname \*q
.B " Driver \*qevdev\*q"
.BI " Option \*qDevice\*q \*q" devpath \*q
.BI " Option \*qPath\*q \*q" path \*q
.BI " Option \*qEmulate3Buttons\*q \*q" True \*q
.BI " Option \*qEmulate3Timeout\*q \*q" 50 \*q
.BI " Option \*qGrabDevice\*q \*q" False \*q
\ \ ...
.B EndSection
.fi
.SH DESCRIPTION
.B evdev
is an __xservername__ input driver for Linux\'s generic event devices. It
therefore supports all input devices that the kernel knows about, including
most mice and keyboards.
.PP
The
.B evdev
driver can serve as both a pointer and a keyboard input device, and may be
used as both the core keyboard and the core pointer. Multiple input devices
are supported by multiple instances of this driver, with one Load
directive for evdev in the Module section of your __xconfigfile__ for each
input device that will use this driver.
.PP
.SH SUPPORTED HARDWARE
In general, any input device that the kernel has a driver for can be accessed
through the
.B evdev
driver. See the Linux kernel documentation for a complete list.
.PP
.SH CONFIGURATION DETAILS
Please refer to __xconfigfile__(__filemansuffix__) for general configuration
details and for options that can be used with all input drivers. This
section only covers configuration details specific to this driver.
.PP
The following driver
.B Options
are supported:
.TP 7
.BI "Option \*qDevice\*q \*q" string \*q
Specifies the device through which the device can be accessed. This will
generally be of the form \*q/dev/input/eventX\*q, where X is some integer.
The mapping from device node to hardware is system-dependent. This option is
mandatory unless \*qPath\*q is given, and there is no default setting.
.TP 7
.BI "Option \*qPath\*q \*q" string \*q
Specifies the device through which the device can be accessed. This will
generally be of the form \*q/dev/input/by-path/xyz\*q, where xyz includes the
name of the device. The mapping from device node to hardware is
system-dependent. This option has precedence over the \*qDevice\*q option but
one of \*qPath\*q or \*qDevice\*q must be given.
.TP 7
.BI "Option \*qEmulate3Buttons\*q \*q" boolean \*q
Enable/disable the emulation of the third (middle) mouse button for mice
which only have two physical buttons. The third button is emulated by
pressing both buttons simultaneously. Default: on, until a middle mouse
button event is registered.
.TP 7
.BI "Option \*qEmulate3Timeout\*q \*q" integer \*q
Sets the timeout (in milliseconds) that the driver waits before deciding
if two buttons where pressed "simultaneously" when 3 button emulation is
enabled. Default: 50.
.TP 7
.BI "Option \*qButtonMapping\*q \*q" string \*q
Sets the button mapping for this device. The mapping is a space-separated list
of button mappings that correspond in order to the physical buttons on the
device (i.e. the first number is the mapping for button 1, etc.). The default
mapping is "1 2 3 ... 32". A mapping of 0 deactivates the button. Multiple
buttons can have the same mapping.
For example, a left-handed mouse with deactivated scroll-wheel would use a
mapping of "3 2 1 0 0". Invalid mappings are ignored and the default mapping
is used. Buttons not specified in the user's mapping use the default mapping.
.TP 7
.BI "Option \*qEmulateWheel\*q \*q" boolean \*q
Enable/disable "wheel" emulation. Wheel emulation means emulating button
press/release events when the mouse is moved while a specific real button
is pressed. Wheel button events (typically buttons 4 and 5) are
usually used for scrolling. Wheel emulation is useful for getting wheel-like
behaviour with trackballs. It can also be useful for mice with 4 or
more buttons but no wheel. See the description of the
.BR EmulateWheelButton ,
.BR EmulateWheelInertia ,
.BR XAxisMapping ,
and
.B YAxisMapping
options below. Default: off.
.TP 7
.BI "Option \*qEmulateWheelButton\*q \*q" integer \*q
Specifies which button must be held down to enable wheel emulation mode.
While this button is down, X and/or Y pointer movement will generate button
press/release events as specified for the
.B XAxisMapping
and
.B YAxisMapping
settings. Default: 4.
.TP 7
.BI "Option \*qEmulateWheelInertia\*q \*q" integer \*q
Specifies how far (in pixels) the pointer must move to generate button
press/release events in wheel emulation mode. Default: 10.
.TP 7
.BI "Option \*qXAxisMapping\*q \*q" "N1 N2" \*q
Specifies which buttons are mapped to motion in the X direction in wheel
emulation mode. Button number
.I N1
is mapped to the negative X axis motion and button number
.I N2
is mapped to the positive X axis motion. Default: no mapping.
.TP 7
.BI "Option \*qYAxisMapping\*q \*q" "N1 N2" \*q
Specifies which buttons are mapped to motion in the Y direction in wheel
emulation mode. Button number
.I N1
is mapped to the negative Y axis motion and button number
.I N2
is mapped to the positive Y axis motion. Default: "4 5"
.TP 7
.BI "Option \*qGrabDevice\*q \*q" boolean \*q
Force a grab on the event device. Doing so will ensure that no other driver
can initialise the same device and it will also stop the device from sending
events to /dev/kbd or /dev/input/mice. Events from this device will not be
sent to virtual devices (e.g. rfkill or the Macintosh mouse button emulation).
Default disabled.
.SH AUTHORS
Kristian Høgsberg.
.SH "SEE ALSO"
__xservername__(__appmansuffix__), __xconfigfile__(__filemansuffix__), xorgconfig(__appmansuffix__), Xserver(__appmansuffix__), X(__miscmansuffix__),
README.mouse.
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