97 lines
3.3 KiB
Plaintext
97 lines
3.3 KiB
Plaintext
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FreeBSD joystick support
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------------------------
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FreeBSD supports two flavors of joysticks: analog and USB. By default,
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non-root users do not have access to these devices on FreeBSD, and the
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required devices may not even be created yet. Please browse the below
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notes before writing to the plib mailing list.
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Contents of this file:
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-----------
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Analog joysticks
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USB joysticks
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Testing the joysticks
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Compiling and linking
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Analog joysticks
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----------------
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Plib uses the joy(4) interface to analog joysticks. You will need to
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make sure the device files exist:
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ls -l /dev/joy*
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If they do not yet exist, create them (logged in as root):
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cd /dev
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sh MAKEDEV joy
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By default, they will have permissions that do not allow unprivileged
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users access to them:
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crw-r----- 1 root operator 51, 0 Aug 30 16:59 joy0
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crw-r----- 1 root operator 51, 1 Aug 30 16:59 joy1
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You may wish to consider making the devices world read/writable:
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chmod a+rw /dev/joy*
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Users of xdm(1) or any of its more modern successors may wish to look
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into GiveConsole and TakeConsole or its equivalent.
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If you do not have a joystick driver compiled into you kernel, you can
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load one dynamically with the command
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kldload joy
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When in doubt, check the FreeBSD handbook about making sure this driver
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is loaded every time you reboot.
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USB joysticks
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-------------
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Plib uses the usbhid(3) interface to USB joysticks. Joysticks will show
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up as generic USB Human Interface Devices (uhid). Because the USB design
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allows an almost unlimited number of USB buses and USB devices, you should
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make sure you have enough devices in /dev to deal with your devices.
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When in doubt, create a few extra to make sure. If you have insufficient
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USB or uhid devices, your joystick may not appear at all, or it may
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disappear if you connect your USB devices in a different order.
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Fortunately, device nodes are free. For example, you might see this:
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ls -al /dev/usb* /dev/uhid*
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crw-rw---- 1 root operator 108, 255 Apr 12 01:44 /dev/usb
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crw-rw---- 1 root operator 108, 0 Apr 12 01:44 /dev/usb0
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crw-rw---- 1 root operator 122, 0 Apr 12 01:44 /dev/uhid0
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This shows you have one usb interface (/dev/usb itself doesn't count), and
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one uhid device. Make a few extra with
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cd /dev
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sh MAKEDEV usb0 usb1 usb2 usb3 uhid0 uhid1 uhid2 uhid3
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(you can leave out the devices that exist already).
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Next, you'll have to think about permissions. Both the /dev/usb0..3
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(but not /dev/usb) have to be world readable, as well as the uhid devices.
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This command will take care of it:
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chmod a+r /dev/usb?* /dev/uhid*
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(yes, the "?*" after /dev/usb is intentional).
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Obviously, any permission change you make is at your own risk! XDM users
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may use the GiveConsole/TakeConsole mechanism as an alternative.
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Plib will complain if /dev/uhid* or /dev/usb* exist but are
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unreadable with your current privileges.
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Testing the joysticks
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---------------------
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Users of FlightGear can quickly test their joysticks with the js_demo
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program.
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Compiling and linking
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---------------------
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Compile plib on FreeBSD with the same compiler options as used for the
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other libraries you may use. In particular, if you use pthreads anywhere
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in your application, you should compile Plib with
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g++ -pthread
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Applications linking to recent Plib's -ljs should add -lusbhid to the
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link command line in the Makefile.
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