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authorRalf Baechle <ralf@linux-mips.org>1997-12-06 23:51:34 +0000
committerRalf Baechle <ralf@linux-mips.org>1997-12-06 23:51:34 +0000
commit230e5ab6a084ed50470f101934782dbf54b0d06b (patch)
tree5dd821c8d33f450470588e7a543f74bf74306e9e /Documentation/joystick.txt
parentc9b1c8a64c6444d189856f1e26bdcb8b4cd0113a (diff)
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+ PC Joystick driver v1.0.6 beta
+ (c) 1997 Vojtech Pavlik <vojtech@atrey.karlin.mff.cuni.cz>
+----------------------------------------------------------------------------
+
+1. Intro
+~~~~~~~~
+ The PC Joystick driver for Linux provides support for analog (variable
+resistor based) and digital (switch based) joysticks connected via the PC
+game port. It can support up to 2 joysticks.
+
+ Because the joystick driver is still in its beta stage I'm very interested
+in any problems you encounter while using it. Bug reports and success
+stories are also welcome.
+
+2. Usage
+~~~~~~~~
+ If you enable the joystick driver in the kernel configuration, all
+connected joystick should be found automatically. If that doesn't work, you
+can pass the joystick driver the following kernel command line arguments:
+
+js=0xXX,0xYY
+
+ Where XX and YY are bit masks for the two joysticks, with the bits
+representing:
+
+Bit | Explanation
+-----------------
+ 0 | Axis 0
+ 1 | Axis 1
+ 2 | Axis 2
+ 3 | Axis 3
+ 4 | Button 0
+ 5 | Button 1
+ 6 | Button 2
+ 7 | Button 3
+
+ These bitmasks are ANDed with what's found by the driver and the result is
+used.
+
+ Another method of using the driver is loading it as a module. For that,
+select `M' for this driver in the kernel configuration and insert the
+module:
+
+insmod js.o js=0xXX,0xYY
+
+ To enable the user space programs to read the joystick device, you have to
+create the device files using mknod (man mknod for more info):
+
+mknod /dev/js0 c 15 0
+mknod /dev/js1 c 15 1
+
+3. Calibration
+~~~~~~~~~~~~~~
+ As of version 1.0 the calibration routines used in the joystick driver are
+worth using. The idea of calibration is that you have to calibrate the
+joystick only once, and then set the calibration at boot-time, thus removing
+the need of re-calibrating it in each program that uses it.
+
+ For calibration, use the jscal program, contained in the joystick package
+which is available at:
+
+ftp://atrey.karlin.mff.cuni.cz/pub/local/vojtech/joystick/joystick-1.0.6.tar.gz
+
+And soon also at:
+
+ftp://sunsite.unc.edu/pub/Linux/kernel/patches/console/joystick-1.0.6.tar.gz
+
+4. Programming Interface
+~~~~~~~~~~~~~~~~~~~~~~~~
+ The 1.0 driver uses a new, event based approach to the joystick driver.
+Instead of the user program polling for the joystick values, the joystick
+driver now reports only any changes of its state. See joystick.h and
+jstest.c included in the joystick package for more information. The joystick
+device can be used in either blocking or nonblocking mode and supports
+select() calls.
+
+ For backward compatibility the old interface is still included, but will
+be dropped in the future.
+
+5. Credits
+~~~~~~~~~~
+ Thanks to the following authors that contributed to the joystick driver
+development:
+
+ 0.1-0.5 Arthur C. Smith <asmith@cbnewsd.att.com>
+ 0.5 Eyal Lebedinsky <eyal@eyal.emu.id.au>
+ 0.6 Jeff Tranter <tranter@software.mitel.com>
+ 0.7 Carlos Puchol <cpg@cs.utexas.edu>
+ 0.7.1-0.8 Matt Rhoten <mrhoten@oz.net>
+ 0.7.3 Dan Fandrich <dan@fch.wimsey.bc.ca>
+ 0.7.3 Sverker Wilberg <sverkerw@manila.docs.uu.se>
+ 0.8 Hal Maney <maney@norden.com>
+ 0.8 Bernd Schmidt <crux@pool.informatik.rwth-aachen.de>
+ 0.9 Alan Cox <alan@cymru.net>
+ 0.9.0-1.0.6 Vojtech Pavlik <vojtech@atrey.karlin.mff.cuni.cz>
+
+6. Change Log
+~~~~~~~~~~~~~
+ The current (1.0.x) version was originally based on the 0.7.3 version of
+the joystick driver, which caused some inconsistencies in version numbering.
+The following log documents all changes done to the driver by various
+contributors:
+
+Version 0.1 Original version
+ Works but lacks multi-joystick support
+Version 0.2 Added multi-joystick support (minor 0 and 1)
+ Added delay between measuring joystick axis
+ Added scaling ioctl
+Version 0.3 Modified scaling to use ints to prevent kernel
+ panics 8-)
+Version 0.4 Linux 0.99.6 and fixed race condition in js_read.
+ After looking at a schematic of a joystick card
+ it became apparent that any write to the joystick
+ port started ALL the joystick one shots. If the
+ one that we are reading is short enough and the
+ first one to be read, the second one will return
+ bad data if it's one shot has not expired when
+ the joystick port is written for the second time.
+ Thus solves the mystery delay problem in 0.2!
+Version 0.5 Upgraded the driver to the 0.99.9 kernel, added
+ joystick support to the make config options,
+ updated the driver to return the buttons as
+ positive logic, and read both axis at once
+ and added some new ioctls.
+Version 0.6 Made necessary changes to work with 0.99.15
+ kernel (and hopefully 1.0). Also did some
+ cleanup: indented code, fixed some typos, wrote
+ man page, etc ...
+Version 0.7 Support for modules
+Version 0.7.1 Fix bug in reading button state of js1
+ Add include so module compiles under recent kernels
+Version 0.7.3 Include directives changed for joystick.h
+ Separated out joystick detection/counting, cleanup
+ Fix for detection of 3-axis joysticks
+ Better detection announcement
+ Added I/O port registration, cleaned up code
+Version 0.8 New read loop
+ Cleaned up #includes to allow #include of joystick.h with
+ gcc -Wall and from g++
+ Made js_init fail if it finds zero joysticks
+ General source/comment cleanup
+ Use of MOD_(INC|DEC)_USE_COUNT
+ Changes to compile correctly under 1.3 in kernel or as module
+Version 0.9 Ported to 2.1.x
+ Reformatted to resemble Linux coding standard
+ Removed semaphore bug (we can dump the lot I think)
+ Fixed xntp timer adjust during joystick timer0 bug
+ Changed variable names to lower case. Kept binary compatibility.
+ Better ioctl names. Kept binary compatibility.
+ Removed 'save_busy'. Just set busy to 1.
+Version 0.9.0 Based on 0.7.3
+ New read function that allows two axes have same value
+ New joystick calibration code
+ Real support for 3-axis joysticks
+ CPU speed independent timeouts
+ Reads may happen even for unwhole record size => cat /dev/js0 works
+ Correct error for lseek
+ /dev/js? can be read simultaneously by several processes
+Version 0.9.1 IOCTLs now obey general Linux IOCTL rules ('j' letter assigned)
+ Use of verify_area result codes
+ Fuzz correction added
+ Semaphore and many cli()'s removed
+ Fix for TurboFire joysticks - read buttons always
+ Fix for broken joysticks - return with -ENODEV only if joystick
+ completely disconnected
+ Fix in read function to allow zero results
+ Broken line correction added for broken joysticks (eg. JB-500)
+ Timeouts back separated for easier setting
+ Some fixes and cleanups in read function
+Version 0.9.2 Fixed a typo causing nothing to be working
+Version 1.0.0 Event approach started
+Version 1.0.1 Complete rewrite
+ Compiles but doesn't work
+Version 1.0.2 Works, many bugs fixed, more yet to come
+Version 1.0.3 Tail cutting logic changes & fixes
+ Fix in js_do_bh - no more zero values for axes
+ Lost event changest & fixes
+Version 1.0.4 Kernel command line & module configuration support
+ Better cli()/sti() handling
+ Linux 2.1.25 select => poll changes
+Version 1.0.5 Fixes in calibration routines
+ Better jscal
+Version 1.0.6 Backward compatibility with old js driver added
+ Init value after recalibration bug fixed
+ Using KERN_* printk() codes
+ Finally leaving ALPHA and going beta
+ Cosmetic changes
+
+7. To do
+~~~~~~~~
+ Sooner or later I'll get to these:
+
+ Backport & create patches for 2.0
+ Try using Pentium timers for better precision
+ Create patches for most common programs using joystick
+ Support for cards with hw calibration (Gravis Ultrasound, QuickShot)
+ Support for multiport cards (QuickShot 4-joy board)
+ Support for multiaxis, multibutton joysticks (Gravis Firebird)
+ Support for MS digital joystick
+