FreeBSD/Linux Kernel Cross Reference
sys/dev/joy/joy.c
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: releng/5.3/sys/dev/joy/joy.c 130585 2004-06-16 09:47:26Z phk $");
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) (minor(d)&1)
58 #define UNIT(d) ((minor(d)>>1)&3)
59 #ifndef JOY_TIMEOUT
60 #define JOY_TIMEOUT 2000 /* 2 milliseconds */
61 #endif
62
63 #define JOY_SOFTC(unit) (struct joy_softc *) \
64 devclass_get_softc(joy_devclass,(unit))
65
66 static d_open_t joyopen;
67 static d_close_t joyclose;
68 static d_read_t joyread;
69 static d_ioctl_t joyioctl;
70
71 static struct cdevsw joy_cdevsw = {
72 .d_version = D_VERSION,
73 .d_flags = D_NEEDGIANT,
74 .d_open = joyopen,
75 .d_close = joyclose,
76 .d_read = joyread,
77 .d_ioctl = joyioctl,
78 .d_name = "joy",
79 };
80
81 devclass_t joy_devclass;
82
83 int
84 joy_probe(device_t dev)
85 {
86 #ifdef WANT_JOYSTICK_CONNECTED
87 #ifdef notyet
88 outb(dev->id_iobase, 0xff);
89 DELAY(10000); /* 10 ms delay */
90 return (inb(dev->id_iobase) & 0x0f) != 0x0f;
91 #else
92 return (0);
93 #endif
94 #else
95 return (0);
96 #endif
97 }
98
99 int
100 joy_attach(device_t dev)
101 {
102 int unit = device_get_unit(dev);
103 struct joy_softc *joy = device_get_softc(dev);
104
105 joy->rid = 0;
106 joy->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &joy->rid,
107 RF_ACTIVE);
108 if (joy->res == NULL)
109 return ENXIO;
110 joy->bt = rman_get_bustag(joy->res);
111 joy->port = rman_get_bushandle(joy->res);
112 joy->timeout[0] = joy->timeout[1] = 0;
113 joy->d = make_dev(&joy_cdevsw, 0, 0, 0, 0600, "joy%d", unit);
114 return (0);
115 }
116
117 int
118 joy_detach(device_t dev)
119 {
120 struct joy_softc *joy = device_get_softc(dev);
121
122 if (joy->res != NULL)
123 bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res);
124 if (joy->d)
125 destroy_dev(joy->d);
126 return (0);
127 }
128
129
130 static int
131 joyopen(struct cdev *dev, int flags, int fmt, struct thread *td)
132 {
133 int i = joypart (dev);
134 struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
135
136 if (joy->timeout[i])
137 return (EBUSY);
138 joy->x_off[i] = joy->y_off[i] = 0;
139 joy->timeout[i] = JOY_TIMEOUT;
140 return (0);
141 }
142
143 static int
144 joyclose(struct cdev *dev, int flags, int fmt, struct thread *td)
145 {
146 int i = joypart (dev);
147 struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
148
149 joy->timeout[i] = 0;
150 return (0);
151 }
152
153 static int
154 joyread(struct cdev *dev, struct uio *uio, int flag)
155 {
156 struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
157 bus_space_handle_t port = joy->port;
158 bus_space_tag_t bt = joy->bt;
159 struct timespec t, start, end;
160 int state = 0;
161 struct timespec x, y;
162 struct joystick c;
163 #ifndef __i386__
164 int s;
165
166 s = splhigh();
167 #else
168 disable_intr ();
169 #endif
170 bus_space_write_1 (bt, port, 0, 0xff);
171 nanotime(&start);
172 end.tv_sec = 0;
173 end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
174 timespecadd(&end, &start);
175 t = start;
176 timespecclear(&x);
177 timespecclear(&y);
178 while (timespeccmp(&t, &end, <)) {
179 state = bus_space_read_1 (bt, port, 0);
180 if (joypart(dev) == 1)
181 state >>= 2;
182 nanotime(&t);
183 if (!timespecisset(&x) && !(state & 0x01))
184 x = t;
185 if (!timespecisset(&y) && !(state & 0x02))
186 y = t;
187 if (timespecisset(&x) && timespecisset(&y))
188 break;
189 }
190 #ifndef __i386__
191 splx(s);
192 #else
193 enable_intr ();
194 #endif
195 if (timespecisset(&x)) {
196 timespecsub(&x, &start);
197 c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000;
198 } else
199 c.x = 0x80000000;
200 if (timespecisset(&y)) {
201 timespecsub(&y, &start);
202 c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000;
203 } else
204 c.y = 0x80000000;
205 state >>= 4;
206 c.b1 = ~state & 1;
207 c.b2 = ~(state >> 1) & 1;
208 return (uiomove((caddr_t)&c, sizeof(struct joystick), uio));
209 }
210
211 static int
212 joyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
213 {
214 struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
215 int i = joypart (dev);
216 int x;
217
218 switch (cmd) {
219 case JOY_SETTIMEOUT:
220 x = *(int *) data;
221 if (x < 1 || x > 10000) /* 10ms maximum! */
222 return EINVAL;
223 joy->timeout[i] = x;
224 break;
225 case JOY_GETTIMEOUT:
226 *(int *) data = joy->timeout[i];
227 break;
228 case JOY_SET_X_OFFSET:
229 joy->x_off[i] = *(int *) data;
230 break;
231 case JOY_SET_Y_OFFSET:
232 joy->y_off[i] = *(int *) data;
233 break;
234 case JOY_GET_X_OFFSET:
235 *(int *) data = joy->x_off[i];
236 break;
237 case JOY_GET_Y_OFFSET:
238 *(int *) data = joy->y_off[i];
239 break;
240 default:
241 return (ENOTTY);
242 }
243 return (0);
244 }
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