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Date: Wed, 23 Jun 2004 17:05:33 -0400 From: Chris Nelson Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick) In the current cvs version, SDL doesn't handle these Playstation2 controller => USB adapters correctly, in linux. It will always assume that the maximum number of joysticks (2 in the case of the MP-8866, 4 in the case of the 8800) are plugged in. This is bad not only because it allows SDL to exaggerate the number of logical joysticks, but primarily because the joystick axes are mapped incorrectly, all over the place, such that the devices are effectively unusable unless you have the maximum number of joysticks plugged in. My changes to src/joystick/linux/SDL_sysjoystick.c build on another's previous work (which was a special case for this very joystick, actually), and fix both of these problems, as well as making the current code a little more general, to allow for others to more easily drop in code for quirky joysticks such as these. I've tested this code under 2.6.7 as well as 2.4.24... Both work as advertised (provided you load the JOYDEV linux code as a module, otherwise they won't work at all, new code or old, but that's another issue entirely). Though this sounds horribly formal, you have my permission to distribute all of my work on this issue under the LGPL. So there.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 25 Jul 2004 18:31:50 +0000
parents 9c6613983e85
children 369dcdb52d70
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/*
 *	IKBD 6301 interrupt routine
 *
 *	Patrice Mandin
 */

	.text

	.globl	_SDL_AtariIkbdInstall
	.globl	_SDL_AtariIkbdUninstall

	.globl	_SDL_AtariIkbd_keyboard
	.globl	_SDL_AtariIkbd_mouseb
	.globl	_SDL_AtariIkbd_mousex
	.globl	_SDL_AtariIkbd_mousey
	.globl	_SDL_AtariIkbd_joystick

	.globl	_SDL_AtariIkbd_enabled

/*--- Install our IKBD vector ---*/

_SDL_AtariIkbdInstall:
	moveml	d0-d1/a0-a1,sp@-

	| Init interrupts

	movew	#0x2700,sr

	| Save MFP registers used for keyboard

	lea	0xfffffa00:w,a0
	btst	#6,a0@(0x09)
	sne	ikbd_ierb
	btst	#6,a0@(0x15)
	sne	ikbd_imrb

	| Set our routine

	movel	0x118:w,old_ikbd
	movel	#ikbd,0x118:w
	bset	#6,0xfffffa09:w	| IERB
	bset	#6,0xfffffa15:w	| IMRB

	moveb	#8,0xfffffc02:w

	movew	#0x2300,sr

	| Interrupts done

	movew	#0xffff,_SDL_AtariIkbd_enabled

	moveml	sp@+,d0-d1/a0-a1
	rts

/*--- Uninstall our IKBD vector ---*/

_SDL_AtariIkbdUninstall:
	movel	a0,sp@-

	| Stop interrupt

	movew	#0x2700,sr

	| Restore previous MFP registers

	lea	0xfffffa00:w,a0

	bclr	#6,a0@(0x09)
	tstb	ikbd_ierb
	beq	ikbd_restoreierb
	bset	#6,a0@(0x09)
ikbd_restoreierb:

	bclr	#6,a0@(0x15)
	tstb	ikbd_imrb
	beq	ikbd_restoreimrb
	bset	#6,a0@(0x15)
ikbd_restoreimrb:

	movel	old_ikbd,0x118:w

	| Clear keyboard buffer

	lea	0xfffffc00:w,a0
ikbd_videbuffer:
	btst	#0,a0@
	beq	ikbd_finbuffer
	tstb	a0@(0x02)
	bra	ikbd_videbuffer
ikbd_finbuffer:

	movew	#0x2300,sr

	movel	sp@+,a0
	rts

	.data
	.even
	.comm	ikbd_ierb,4*1
	.even
	.comm	ikbd_imrb,4*1

/*--- Our custom IKBD vector ---*/

	.text
	.even
	.ascii	"XBRA"
	.ascii	"LSDL"
	.comm	old_ikbd,4*1
ikbd:
	moveml	d0-d1/a0,sp@-
	moveb	0xfffffc02:w,d0

	| paquet joystick ?
	
	cmpb	#0xff,d0
	beq	ikbd_yes_joystick

	| paquet souris ?

	cmpb	#0xf8,d0
	bmi	ikbd_no_mouse
	cmpb	#0xfc,d0
	bpl	ikbd_no_mouse

ikbd_yes_mouse:
	andw	#3,d0
	movew	d0,_SDL_AtariIkbd_mouseb

	movel	#ikbd_mousex,0x118:w
	bra	ikbd_endit

ikbd_yes_joystick:
	movel	#ikbd_joystick,0x118:w
	bra	ikbd_endit

ikbd_no_mouse:
	moveb	d0,d1
	lea	_SDL_AtariIkbd_keyboard,a0
	andl	#0x7f,d1
	tas	d0
	spl	a0@(0,d1:w)
ikbd_fin:

	| Fin interruption

ikbd_endit:
	moveml	sp@+,d0-d1/a0
	bclr	#6,0xfffffa11:w
	rte

ikbd_mousex:
	movel	d0,sp@-

	moveb	0xfffffc02:w,d0
	extw	d0
	addw	d0,_SDL_AtariIkbd_mousex

	movel	sp@+,d0

	movel	#ikbd_mousey,0x118:w
	bclr	#6,0xfffffa11:w
	rte

ikbd_mousey:
	movel	d0,sp@-

	moveb	0xfffffc02:w,d0
	extw	d0
	addw	d0,_SDL_AtariIkbd_mousey

	movel	sp@+,d0

	movel	#ikbd,0x118:w
	bclr	#6,0xfffffa11:w
	rte

ikbd_joystick:
	moveb	0xfffffc02:w,_SDL_AtariIkbd_joystick+1

	movel	#ikbd,0x118:w
	bclr	#6,0xfffffa11:w
	rte

	.data
	
	.even
_SDL_AtariIkbd_enabled:
	.word	0
	.even
	.comm	_SDL_AtariIkbd_keyboard,128
	.even
	.comm	_SDL_AtariIkbd_mousex,2*1
	.even
	.comm	_SDL_AtariIkbd_mousey,2*1
	.even
	.comm	_SDL_AtariIkbd_mouseb,2*1
	.even
	.comm	_SDL_AtariIkbd_joystick,2*1