joy.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1995 Jean-Marc Zucconi
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/12.0/sys/dev/joy/joy.c 336914 2018-07-30 15:46:40Z asomers $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/conf.h>
   38 #include <sys/uio.h>
   39 #include <sys/kernel.h>
   40 #include <sys/module.h>
   41 #include <sys/bus.h>
   42 #include <machine/bus.h>
   43 #include <machine/resource.h>
   44 #include <sys/rman.h>
   45 #include <sys/time.h>
   46 #include <sys/joystick.h>
   47 #include <dev/joy/joyvar.h>
   48 
   49 /* The game port can manage 4 buttons and 4 variable resistors (usually 2
   50  * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201.
   51  * Getting the state of the buttons is done by reading the game port:
   52  * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2)
   53  * to bits 0-3.
   54  * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0
   55  * to get the value of a resistor, write the value 0xff at port and
   56  * wait until the corresponding bit returns to 0.
   57  */
   58 
   59 #define joypart(d) (dev2unit(d)&1)
   60 #ifndef JOY_TIMEOUT
   61 #define JOY_TIMEOUT   2000 /* 2 milliseconds */
   62 #endif
   63 
   64 static  d_open_t        joyopen;
   65 static  d_close_t       joyclose;
   66 static  d_read_t        joyread;
   67 static  d_ioctl_t       joyioctl;
   68 
   69 static struct cdevsw joy_cdevsw = {
   70         .d_version =    D_VERSION,
   71         .d_flags =      D_NEEDGIANT,
   72         .d_open =       joyopen,
   73         .d_close =      joyclose,
   74         .d_read =       joyread,
   75         .d_ioctl =      joyioctl,
   76         .d_name =       "joy",
   77 };
   78 
   79 devclass_t joy_devclass;
   80 
   81 int
   82 joy_probe(device_t dev)
   83 {
   84 #ifdef WANT_JOYSTICK_CONNECTED
   85 #ifdef notyet
   86         outb(dev->id_iobase, 0xff);
   87         DELAY(10000); /*  10 ms delay */
   88         return (inb(dev->id_iobase) & 0x0f) != 0x0f;
   89 #else
   90         return (0);
   91 #endif
   92 #else
   93         return (0);
   94 #endif
   95 }
   96 
   97 int
   98 joy_attach(device_t dev)
   99 {
  100         int     unit = device_get_unit(dev);
  101         struct joy_softc *joy = device_get_softc(dev);
  102 
  103         joy->rid = 0;
  104         joy->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &joy->rid,
  105             RF_ACTIVE|RF_SHAREABLE);
  106         if (joy->res == NULL)
  107                 return ENXIO;
  108         joy->bt = rman_get_bustag(joy->res);
  109         joy->port = rman_get_bushandle(joy->res);
  110         joy->timeout[0] = joy->timeout[1] = 0;
  111         joy->d = make_dev(&joy_cdevsw, unit, 0, 0, 0600, "joy%d", unit);
  112         joy->d->si_drv1 = joy;
  113         gone_in_dev(dev, 12, "joy(4) driver");
  114 
  115         return (0);
  116 }
  117 
  118 int
  119 joy_detach(device_t dev)
  120 {
  121         struct joy_softc *joy = device_get_softc(dev);
  122 
  123         if (joy->res != NULL)
  124                 bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res);
  125         if (joy->d)
  126                 destroy_dev(joy->d);
  127         return (0);
  128 }
  129 
  130 
  131 static int
  132 joyopen(struct cdev *dev, int flags, int fmt, struct thread *td)
  133 {
  134         int i = joypart (dev);
  135         struct joy_softc *joy = dev->si_drv1;
  136 
  137         if (joy->timeout[i])
  138                 return (EBUSY);
  139         joy->x_off[i] = joy->y_off[i] = 0;
  140         joy->timeout[i] = JOY_TIMEOUT;
  141         return (0);
  142 }
  143 
  144 static int
  145 joyclose(struct cdev *dev, int flags, int fmt, struct thread *td)
  146 {
  147         int i = joypart (dev);
  148         struct joy_softc *joy = dev->si_drv1;
  149 
  150         joy->timeout[i] = 0;
  151         return (0);
  152 }
  153 
  154 static int
  155 joyread(struct cdev *dev, struct uio *uio, int flag)
  156 {
  157         struct joy_softc *joy = dev->si_drv1;
  158         bus_space_handle_t port = joy->port;
  159         bus_space_tag_t bt = joy->bt;
  160         struct timespec t, start, end;
  161         int state = 0;
  162         struct timespec x, y;
  163         struct joystick c;
  164 #ifndef __i386__
  165         int s;
  166 
  167         s = splhigh();
  168 #else
  169         disable_intr ();
  170 #endif
  171         nanotime(&t);
  172         end.tv_sec = 0;
  173         end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
  174         timespecadd(&end, &t, &end);
  175         for (; timespeccmp(&t, &end, <) && (bus_space_read_1(bt, port, 0) & 0x0f); nanotime(&t))
  176                 ;       /* nothing */
  177         bus_space_write_1 (bt, port, 0, 0xff);
  178         nanotime(&start);
  179         end.tv_sec = 0;
  180         end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
  181         timespecadd(&end, &start, &end);
  182         t = start;
  183         timespecclear(&x);
  184         timespecclear(&y);
  185         while (timespeccmp(&t, &end, <)) {
  186                 state = bus_space_read_1 (bt, port, 0);
  187                 if (joypart(dev) == 1)
  188                         state >>= 2;
  189                 nanotime(&t);
  190                 if (!timespecisset(&x) && !(state & 0x01))
  191                         x = t;
  192                 if (!timespecisset(&y) && !(state & 0x02))
  193                         y = t;
  194                 if (timespecisset(&x) && timespecisset(&y))
  195                         break;
  196         }
  197 #ifndef __i386__
  198         splx(s);
  199 #else
  200         enable_intr ();
  201 #endif
  202         if (timespecisset(&x)) {
  203                 timespecsub(&x, &start, &x);
  204                 c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000;
  205         } else
  206                 c.x = 0x80000000;
  207         if (timespecisset(&y)) {
  208                 timespecsub(&y, &start, &y);
  209                 c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000;
  210         } else
  211                 c.y = 0x80000000;
  212         state >>= 4;
  213         c.b1 = ~state & 1;
  214         c.b2 = ~(state >> 1) & 1;
  215         return (uiomove((caddr_t)&c, sizeof(struct joystick), uio));
  216 }
  217 
  218 static int
  219 joyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
  220 {
  221         struct joy_softc *joy = dev->si_drv1;
  222         int i = joypart (dev);
  223         int x;
  224 
  225         switch (cmd) {
  226         case JOY_SETTIMEOUT:
  227                 x = *(int *) data;
  228                 if (x < 1 || x > 10000) /* 10ms maximum! */
  229                         return EINVAL;
  230                 joy->timeout[i] = x;
  231                 break;
  232         case JOY_GETTIMEOUT:
  233                 *(int *) data = joy->timeout[i];
  234                 break;
  235         case JOY_SET_X_OFFSET:
  236                 joy->x_off[i] = *(int *) data;
  237                 break;
  238         case JOY_SET_Y_OFFSET:
  239                 joy->y_off[i] = *(int *) data;
  240                 break;
  241         case JOY_GET_X_OFFSET:
  242                 *(int *) data = joy->x_off[i];
  243                 break;
  244         case JOY_GET_Y_OFFSET:
  245                 *(int *) data = joy->y_off[i];
  246                 break;
  247         default:
  248                 return (ENOTTY);
  249         }
  250         return (0);
  251 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/joy/joy.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/joy/joy.c