summaryrefslogtreecommitdiffstats
path: root/sys/isa/joy.c
blob: 072be4edb5c54b4d12e14c0a4a5d8c9eea7c528b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*-
 * 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 withough 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 "joy.h"

#if NJOY > 0

#include "opt_devfs.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <sys/uio.h>

#include <machine/clock.h>
#include <machine/joystick.h>

#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/timerreg.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.
 */


/* the formulae below only work if u is  ``not too large''. See also
 * the discussion in microtime.s */
#define usec2ticks(u) 	(((u) * 19549)>>14)
#define ticks2usec(u) 	(((u) * 3433)>>12)


#define joypart(d) minor(d)&1
#define UNIT(d) minor(d)>>1&3
#ifndef JOY_TIMEOUT
#define JOY_TIMEOUT   2000 /* 2 milliseconds */
#endif

static struct {
    int port;
    int x_off[2], y_off[2];
    int timeout[2];
#ifdef	DEVFS
    void	*devfs_token;
#endif
} joy[NJOY];


static int joyprobe (struct isa_device *);
static int joyattach (struct isa_device *);

struct isa_driver joydriver = {joyprobe, joyattach, "joy"};

#define CDEV_MAJOR 51
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 = 
	{ joyopen,	joyclose,	joyread,	nowrite,	/*51*/
	  joyioctl,	nostop,		nullreset,	nodevtotty,/*joystick */
	  seltrue,	nommap,		NULL,	"joy",	NULL,	-1 };

static int get_tick __P((void));


static int
joyprobe (struct isa_device *dev)
{
#ifdef WANT_JOYSTICK_CONNECTED
    outb (dev->id_iobase, 0xff);
    DELAY (10000); /*  10 ms delay */
    return (inb (dev->id_iobase) & 0x0f) != 0x0f;
#else
    return 1;
#endif
}

static int
joyattach (struct isa_device *dev)
{
    int	unit = dev->id_unit;

    joy[unit].port = dev->id_iobase;
    joy[unit].timeout[0] = joy[unit].timeout[1] = 0;
    printf("joy%d: joystick\n", unit);
#ifdef	DEVFS
    joy[dev->id_unit].devfs_token = 
		devfs_add_devswf(&joy_cdevsw, 0, DV_CHR, 0, 0, 
				 0600, "joy%d", unit);
#endif
    return 1;
}

static	int
joyopen (dev_t dev, int flags, int fmt, struct proc *p)
{
    int unit = UNIT (dev);
    int i = joypart (dev);

    if (joy[unit].timeout[i])
	return EBUSY;
    joy[unit].x_off[i] = joy[unit].y_off[i] = 0;
    joy[unit].timeout[i] = JOY_TIMEOUT;
    return 0;
}
static	int
joyclose (dev_t dev, int flags, int fmt, struct proc *p)
{
    int unit = UNIT (dev);
    int i = joypart (dev);

    joy[unit].timeout[i] = 0;
    return 0;
}

static	int
joyread (dev_t dev, struct uio *uio, int flag)
{
    int unit = UNIT(dev);
    int port = joy[unit].port;
    int i, t0, t1;
    int state = 0, x = 0, y = 0;
    struct joystick c;

    disable_intr ();
    outb (port, 0xff);
    t0 = get_tick ();
    t1 = t0;
    i = usec2ticks(joy[unit].timeout[joypart(dev)]);
    while (t0-t1 < i) {
	state = inb (port);
	if (joypart(dev) == 1)
	    state >>= 2;
	t1 = get_tick ();
	if (t1 > t0)
	    t1 -= timer0_max_count;
	if (!x && !(state & 0x01))
	    x = t1;
	if (!y && !(state & 0x02))
	    y =  t1;
	if (x && y)
	    break;
    }
    enable_intr ();
    c.x = x ? joy[unit].x_off[joypart(dev)] + ticks2usec(t0-x) : 0x80000000;
    c.y = y ? joy[unit].y_off[joypart(dev)] + ticks2usec(t0-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 (dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
{
    int unit = 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[unit].timeout[i] = x;
	break;
    case JOY_GETTIMEOUT:
	*(int *) data = joy[unit].timeout[i];
	break;
    case JOY_SET_X_OFFSET:
	joy[unit].x_off[i] = *(int *) data;
	break;
    case JOY_SET_Y_OFFSET:
	joy[unit].y_off[i] = *(int *) data;
	break;
    case JOY_GET_X_OFFSET:
	*(int *) data = joy[unit].x_off[i];
	break;
    case JOY_GET_Y_OFFSET:
	*(int *) data = joy[unit].y_off[i];
	break;
    default:
	return ENXIO;
    }
    return 0;
}

static int
get_tick ()
{
    int low, high;

    outb (TIMER_MODE, TIMER_SEL0);
    low = inb (TIMER_CNTR0);
    high = inb (TIMER_CNTR0);

    return (high << 8) | low;
}


static joy_devsw_installed = 0;

static void 	joy_drvinit(void *unused)
{
	dev_t dev;

	if( ! joy_devsw_installed ) {
		dev = makedev(CDEV_MAJOR,0);
		cdevsw_add(&dev,&joy_cdevsw,NULL);
		joy_devsw_installed = 1;
    	}
}

SYSINIT(joydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,joy_drvinit,NULL)

#ifdef JOY_MODULE

#include <sys/exec.h>
#include <sys/sysent.h>
#include <sys/lkm.h>

MOD_DEV (joy, LM_DT_CHAR, CDEV_MAJOR, &joy_cdevsw);

static struct isa_device dev = {0, &joydriver, IO_GAME, 0, -1, (caddr_t) 0, 0, 0, 0, 0, 0, 0, 0,  0, 1, 0, 0};

static int 
joy_load (struct lkm_table *lkmtp, int cmd)
{
    if (joyprobe (&dev)) {
	joyattach (&dev);
/*	    joy_drvinit (0);*/
	uprintf ("Joystick driver loaded\n");
	return 0;
    } else {
	uprintf ("Joystick driver: probe failed\n");
	return 1;
    }
}

static int
joy_unload (struct lkm_table *lkmtp, int cmd)
{
    uprintf ("Joystick driver unloaded\n");
    return 0;
}

static int
joy_stat (struct lkm_table *lkmtp, int cmd)
{
    return 0;
}

int
joy_mod (struct lkm_table *lkmtp, int cmd, int ver)
{
    MOD_DISPATCH(joy, lkmtp, cmd, ver,
	joy_load, joy_unload, joy_stat);
}

#endif /* JOY_MODULE */


#endif /* NJOY > 0 */
OpenPOWER on IntegriCloud