FreeBSD-5.3/sys/dev/joy/joy.c
/*-
* Copyright (c) 1995 Jean-Marc Zucconi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/dev/joy/joy.c,v 1.53 2004/06/16 09:46:48 phk Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <sys/time.h>
#include <sys/joystick.h>
#include <dev/joy/joyvar.h>
/* The game port can manage 4 buttons and 4 variable resistors (usually 2
* joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201.
* Getting the state of the buttons is done by reading the game port:
* buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2)
* to bits 0-3.
* if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0
* to get the value of a resistor, write the value 0xff at port and
* wait until the corresponding bit returns to 0.
*/
#define joypart(d) (minor(d)&1)
#define UNIT(d) ((minor(d)>>1)&3)
#ifndef JOY_TIMEOUT
#define JOY_TIMEOUT 2000 /* 2 milliseconds */
#endif
#define JOY_SOFTC(unit) (struct joy_softc *) \
devclass_get_softc(joy_devclass,(unit))
static d_open_t joyopen;
static d_close_t joyclose;
static d_read_t joyread;
static d_ioctl_t joyioctl;
static struct cdevsw joy_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = joyopen,
.d_close = joyclose,
.d_read = joyread,
.d_ioctl = joyioctl,
.d_name = "joy",
};
devclass_t joy_devclass;
int
joy_probe(device_t dev)
{
#ifdef WANT_JOYSTICK_CONNECTED
#ifdef notyet
outb(dev->id_iobase, 0xff);
DELAY(10000); /* 10 ms delay */
return (inb(dev->id_iobase) & 0x0f) != 0x0f;
#else
return (0);
#endif
#else
return (0);
#endif
}
int
joy_attach(device_t dev)
{
int unit = device_get_unit(dev);
struct joy_softc *joy = device_get_softc(dev);
joy->rid = 0;
joy->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &joy->rid,
RF_ACTIVE);
if (joy->res == NULL)
return ENXIO;
joy->bt = rman_get_bustag(joy->res);
joy->port = rman_get_bushandle(joy->res);
joy->timeout[0] = joy->timeout[1] = 0;
joy->d = make_dev(&joy_cdevsw, 0, 0, 0, 0600, "joy%d", unit);
return (0);
}
int
joy_detach(device_t dev)
{
struct joy_softc *joy = device_get_softc(dev);
if (joy->res != NULL)
bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res);
if (joy->d)
destroy_dev(joy->d);
return (0);
}
static int
joyopen(struct cdev *dev, int flags, int fmt, struct thread *td)
{
int i = joypart (dev);
struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
if (joy->timeout[i])
return (EBUSY);
joy->x_off[i] = joy->y_off[i] = 0;
joy->timeout[i] = JOY_TIMEOUT;
return (0);
}
static int
joyclose(struct cdev *dev, int flags, int fmt, struct thread *td)
{
int i = joypart (dev);
struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
joy->timeout[i] = 0;
return (0);
}
static int
joyread(struct cdev *dev, struct uio *uio, int flag)
{
struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
bus_space_handle_t port = joy->port;
bus_space_tag_t bt = joy->bt;
struct timespec t, start, end;
int state = 0;
struct timespec x, y;
struct joystick c;
#ifndef __i386__
int s;
s = splhigh();
#else
disable_intr ();
#endif
bus_space_write_1 (bt, port, 0, 0xff);
nanotime(&start);
end.tv_sec = 0;
end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
timespecadd(&end, &start);
t = start;
timespecclear(&x);
timespecclear(&y);
while (timespeccmp(&t, &end, <)) {
state = bus_space_read_1 (bt, port, 0);
if (joypart(dev) == 1)
state >>= 2;
nanotime(&t);
if (!timespecisset(&x) && !(state & 0x01))
x = t;
if (!timespecisset(&y) && !(state & 0x02))
y = t;
if (timespecisset(&x) && timespecisset(&y))
break;
}
#ifndef __i386__
splx(s);
#else
enable_intr ();
#endif
if (timespecisset(&x)) {
timespecsub(&x, &start);
c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000;
} else
c.x = 0x80000000;
if (timespecisset(&y)) {
timespecsub(&y, &start);
c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000;
} else
c.y = 0x80000000;
state >>= 4;
c.b1 = ~state & 1;
c.b2 = ~(state >> 1) & 1;
return (uiomove((caddr_t)&c, sizeof(struct joystick), uio));
}
static int
joyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
int i = joypart (dev);
int x;
switch (cmd) {
case JOY_SETTIMEOUT:
x = *(int *) data;
if (x < 1 || x > 10000) /* 10ms maximum! */
return EINVAL;
joy->timeout[i] = x;
break;
case JOY_GETTIMEOUT:
*(int *) data = joy->timeout[i];
break;
case JOY_SET_X_OFFSET:
joy->x_off[i] = *(int *) data;
break;
case JOY_SET_Y_OFFSET:
joy->y_off[i] = *(int *) data;
break;
case JOY_GET_X_OFFSET:
*(int *) data = joy->x_off[i];
break;
case JOY_GET_Y_OFFSET:
*(int *) data = joy->y_off[i];
break;
default:
return (ENOTTY);
}
return (0);
}