The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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/8.3/sys/dev/joy/joy.c 191054 2009-04-14 11:23:09Z ed $");
   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 
   62 static  d_open_t        joyopen;
   63 static  d_close_t       joyclose;
   64 static  d_read_t        joyread;
   65 static  d_ioctl_t       joyioctl;
   66 
   67 static 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 
   77 devclass_t joy_devclass;
   78 
   79 int
   80 joy_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 
   95 int
   96 joy_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 
  114 int
  115 joy_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 
  127 static int
  128 joyopen(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 
  140 static int
  141 joyclose(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 
  150 static int
  151 joyread(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 
  214 static int
  215 joyioctl(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 }

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