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

     /*-
      * 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.
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/conf.h>
    #include <sys/uio.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <machine/bus.h>
    #include <machine/resource.h>
    #include <sys/rman.h>
    #include <sys/time.h>
    #include <sys/joystick.h>
    
    #include <isa/isavar.h>
    #include "isa_if.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.
     */
    
    #define joypart(d) (minor(d)&1)
    #define UNIT(d) ((minor(d)>>1)&3)
    #ifndef JOY_TIMEOUT
    #define JOY_TIMEOUT   2000 /* 2 milliseconds */
    #endif
    
    struct joy_softc {
        bus_space_tag_t  bt;
        bus_space_handle_t port;
        int x_off[2], y_off[2];
        int timeout[2];
    };
    
    #define JOY_SOFTC(unit) (struct joy_softc *) \
            devclass_get_softc(joy_devclass,(unit))
    
    static int joy_probe (device_t);
    static int joy_attach (device_t);
    
    #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 = {
            /* open */      joyopen,
            /* close */     joyclose,
            /* read */      joyread,
            /* write */     nowrite,
            /* ioctl */     joyioctl,
            /* poll */      nopoll,
            /* mmap */      nommap,
            /* strategy */  nostrategy,
            /* name */      "joy",
            /* maj */       CDEV_MAJOR,
            /* dump */      nodump,
            /* psize */     nopsize,
            /* flags */     0,
            /* bmaj */      -1
    };
    
    devclass_t joy_devclass;
   
   static struct isa_pnp_id joy_ids[] = {
       {0x0100630e, "CSC0001 PnP Joystick"},       /* CSC0001 */
       {0x0101630e, "CSC0101 PnP Joystick"},       /* CSC0101 */
       {0x01100002, "ALS0110 PnP Joystick"},       /* @P@1001 */
       {0x01200002, "ALS0120 PnP Joystick"},       /* @P@2001 */
       {0x01007316, "ESS0001 PnP Joystick"},       /* ESS0001 */
       {0x2fb0d041, "Generic PnP Joystick"},       /* PNPb02f */
       {0x2200a865, "YMH0022 PnP Joystick"},       /* YMH0022 */
       {0x82719304, NULL},                         /* ADS7182 */
       {0}
   };
   
   static int
   joy_probe (device_t dev)
   {
       if (ISA_PNP_PROBE(device_get_parent(dev), dev, joy_ids) == ENXIO)
           return ENXIO;
   #ifdef WANT_JOYSTICK_CONNECTED
   #ifdef notyet
       outb (dev->id_iobase, 0xff);
       DELAY (10000); /*  10 ms delay */
       return (inb (dev->id_iobase) & 0x0f) != 0x0f;
   #endif
   #else
       return 0;
   #endif
   }
   
   static int
   joy_attach (device_t dev)
   {
       int unit = device_get_unit(dev);
       int rid = 0;
       struct resource *res;
       struct joy_softc *joy = device_get_softc(dev);
   
       res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, RF_ACTIVE);
       if (res == NULL)
           return ENXIO;
       joy->bt = rman_get_bustag(res);
       joy->port = rman_get_bushandle(res);
       joy->timeout[0] = joy->timeout[1] = 0;
       make_dev(&joy_cdevsw, 0, 0, 0, 0600, "joy%d", unit);
       return 0;
   }
   
   static device_method_t joy_methods[] = {
       DEVMETHOD(device_probe,     joy_probe),
       DEVMETHOD(device_attach,    joy_attach),
       { 0, 0 }
   };
   
   static driver_t joy_isa_driver = {
       "joy",
       joy_methods,
       sizeof (struct joy_softc)
   };
   
   DRIVER_MODULE(joy, isa, joy_isa_driver, joy_devclass, 0, 0);
   
   static int
   joyopen(dev_t dev, int flags, int fmt, struct proc *p)
   {
       int i = joypart (dev);
       struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
   
       if (joy->timeout[i])
           return EBUSY;
       joy->x_off[i] = joy->y_off[i] = 0;
       joy->timeout[i] = JOY_TIMEOUT;
       return 0;
   }
   
   static int
   joyclose(dev_t dev, int flags, int fmt, struct proc *p)
   {
       int i = joypart (dev);
       struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
   
       joy->timeout[i] = 0;
       return 0;
   }
   
   static int
   joyread(dev_t dev, struct uio *uio, int flag)
   {
       struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
       bus_space_handle_t port = joy->port;
       bus_space_tag_t bt = joy->bt;
       struct timespec t, start, end;
       int state = 0;
       struct timespec x, y;
       struct joystick c;
   #ifndef i386
       int s;
   
       s = splhigh();
   #else
       disable_intr ();
   #endif
       bus_space_write_1 (bt, port, 0, 0xff);
       nanotime(&start);
       end.tv_sec = 0;
       end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
       timespecadd(&end, &start);
       t = start;
       timespecclear(&x);
       timespecclear(&y);
       while (timespeccmp(&t, &end, <)) {
           state = bus_space_read_1 (bt, port, 0);
           if (joypart(dev) == 1)
               state >>= 2;
           nanotime(&t);
           if (!timespecisset(&x) && !(state & 0x01))
               x = t;
           if (!timespecisset(&y) && !(state & 0x02))
               y = t;
           if (timespecisset(&x) && timespecisset(&y))
               break;
       }
   #ifndef i386
       splx(s);
   #else
       enable_intr ();
   #endif
       if (timespecisset(&x)) {
           timespecsub(&x, &start);
           c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000;
       } else
           c.x = 0x80000000;
       if (timespecisset(&y)) {
           timespecsub(&y, &start);
           c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000;
       } else
           c.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, u_long cmd, caddr_t data, int flag, struct proc *p)
   {
       struct joy_softc *joy = JOY_SOFTC(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->timeout[i] = x;
           break;
       case JOY_GETTIMEOUT:
           *(int *) data = joy->timeout[i];
           break;
       case JOY_SET_X_OFFSET:
           joy->x_off[i] = *(int *) data;
           break;
       case JOY_SET_Y_OFFSET:
           joy->y_off[i] = *(int *) data;
           break;
       case JOY_GET_X_OFFSET:
           *(int *) data = joy->x_off[i];
           break;
       case JOY_GET_Y_OFFSET:
           *(int *) data = joy->y_off[i];
           break;
       default:
           return ENXIO;
       }
       return 0;
   }

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