1/*-
2 * Copyright (c) 1995 Jean-Marc Zucconi
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/conf.h>
36#include <sys/uio.h>
37#include <sys/kernel.h>
38#include <sys/module.h>
39#include <sys/bus.h>
40#include <machine/bus.h>
41#include <machine/resource.h>
42#include <sys/rman.h>
43#include <sys/time.h>
44#include <sys/joystick.h>
45#include <dev/joy/joyvar.h>
46
47/* The game port can manage 4 buttons and 4 variable resistors (usually 2
48 * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201.
49 * Getting the state of the buttons is done by reading the game port:
50 * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2)
51 * to bits 0-3.
52 * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0
53 * to get the value of a resistor, write the value 0xff at port and
54 * wait until the corresponding bit returns to 0.
55 */
56
57#define joypart(d) (dev2unit(d)&1)
58#ifndef JOY_TIMEOUT
59#define JOY_TIMEOUT   2000 /* 2 milliseconds */
60#endif
61
62static	d_open_t	joyopen;
63static	d_close_t	joyclose;
64static	d_read_t	joyread;
65static	d_ioctl_t	joyioctl;
66
67static struct cdevsw joy_cdevsw = {
68	.d_version =	D_VERSION,
69	.d_flags =	D_NEEDGIANT,
70	.d_open =	joyopen,
71	.d_close =	joyclose,
72	.d_read =	joyread,
73	.d_ioctl =	joyioctl,
74	.d_name =	"joy",
75};
76
77devclass_t joy_devclass;
78
79int
80joy_probe(device_t dev)
81{
82#ifdef WANT_JOYSTICK_CONNECTED
83#ifdef notyet
84	outb(dev->id_iobase, 0xff);
85	DELAY(10000); /*  10 ms delay */
86	return (inb(dev->id_iobase) & 0x0f) != 0x0f;
87#else
88	return (0);
89#endif
90#else
91	return (0);
92#endif
93}
94
95int
96joy_attach(device_t dev)
97{
98	int	unit = device_get_unit(dev);
99	struct joy_softc *joy = device_get_softc(dev);
100
101	joy->rid = 0;
102	joy->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &joy->rid,
103	    RF_ACTIVE|RF_SHAREABLE);
104	if (joy->res == NULL)
105		return ENXIO;
106	joy->bt = rman_get_bustag(joy->res);
107	joy->port = rman_get_bushandle(joy->res);
108	joy->timeout[0] = joy->timeout[1] = 0;
109	joy->d = make_dev(&joy_cdevsw, unit, 0, 0, 0600, "joy%d", unit);
110	joy->d->si_drv1 = joy;
111	return (0);
112}
113
114int
115joy_detach(device_t dev)
116{
117	struct joy_softc *joy = device_get_softc(dev);
118
119	if (joy->res != NULL)
120		bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res);
121	if (joy->d)
122		destroy_dev(joy->d);
123	return (0);
124}
125
126
127static int
128joyopen(struct cdev *dev, int flags, int fmt, struct thread *td)
129{
130	int i = joypart (dev);
131	struct joy_softc *joy = dev->si_drv1;
132
133	if (joy->timeout[i])
134		return (EBUSY);
135	joy->x_off[i] = joy->y_off[i] = 0;
136	joy->timeout[i] = JOY_TIMEOUT;
137	return (0);
138}
139
140static int
141joyclose(struct cdev *dev, int flags, int fmt, struct thread *td)
142{
143	int i = joypart (dev);
144	struct joy_softc *joy = dev->si_drv1;
145
146	joy->timeout[i] = 0;
147	return (0);
148}
149
150static int
151joyread(struct cdev *dev, struct uio *uio, int flag)
152{
153	struct joy_softc *joy = dev->si_drv1;
154	bus_space_handle_t port = joy->port;
155	bus_space_tag_t bt = joy->bt;
156	struct timespec t, start, end;
157	int state = 0;
158	struct timespec x, y;
159	struct joystick c;
160#ifndef __i386__
161	int s;
162
163	s = splhigh();
164#else
165	disable_intr ();
166#endif
167	nanotime(&t);
168	end.tv_sec = 0;
169	end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
170	timespecadd(&end, &t);
171	for (; timespeccmp(&t, &end, <) && (bus_space_read_1(bt, port, 0) & 0x0f); nanotime(&t))
172		;	/* nothing */
173	bus_space_write_1 (bt, port, 0, 0xff);
174	nanotime(&start);
175	end.tv_sec = 0;
176	end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
177	timespecadd(&end, &start);
178	t = start;
179	timespecclear(&x);
180	timespecclear(&y);
181	while (timespeccmp(&t, &end, <)) {
182		state = bus_space_read_1 (bt, port, 0);
183		if (joypart(dev) == 1)
184			state >>= 2;
185		nanotime(&t);
186		if (!timespecisset(&x) && !(state & 0x01))
187			x = t;
188		if (!timespecisset(&y) && !(state & 0x02))
189			y = t;
190		if (timespecisset(&x) && timespecisset(&y))
191			break;
192	}
193#ifndef __i386__
194	splx(s);
195#else
196	enable_intr ();
197#endif
198	if (timespecisset(&x)) {
199		timespecsub(&x, &start);
200		c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000;
201	} else
202		c.x = 0x80000000;
203	if (timespecisset(&y)) {
204		timespecsub(&y, &start);
205		c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000;
206	} else
207		c.y = 0x80000000;
208	state >>= 4;
209	c.b1 = ~state & 1;
210	c.b2 = ~(state >> 1) & 1;
211	return (uiomove((caddr_t)&c, sizeof(struct joystick), uio));
212}
213
214static int
215joyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
216{
217	struct joy_softc *joy = dev->si_drv1;
218	int i = joypart (dev);
219	int x;
220
221	switch (cmd) {
222	case JOY_SETTIMEOUT:
223		x = *(int *) data;
224		if (x < 1 || x > 10000) /* 10ms maximum! */
225			return EINVAL;
226		joy->timeout[i] = x;
227		break;
228	case JOY_GETTIMEOUT:
229		*(int *) data = joy->timeout[i];
230		break;
231	case JOY_SET_X_OFFSET:
232		joy->x_off[i] = *(int *) data;
233		break;
234	case JOY_SET_Y_OFFSET:
235		joy->y_off[i] = *(int *) data;
236		break;
237	case JOY_GET_X_OFFSET:
238		*(int *) data = joy->x_off[i];
239		break;
240	case JOY_GET_Y_OFFSET:
241		*(int *) data = joy->y_off[i];
242		break;
243	default:
244		return (ENOTTY);
245	}
246	return (0);
247}
248