FreeBSD/Linux Kernel Cross Reference
sys/i386/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.
     *
     */
    #include "joy.h"
    
    #if NJOY > 0
    
    #include <sys/errno.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 <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/sysproto.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};
   
   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;
       }
   }
   
   int
   joy_unload (struct lkm_table *lkmtp, int cmd)
   {
       uprintf ("Joystick driver unloaded\n");
       return 0;
   }
   int
   joy_stat (struct lkm_table *lkmtp, int cmd)
   {
       return 0;
   }
   int
   joy_mod (struct lkm_table *lkmtp, int cmd, int ver)
   {
       DISPATCH(lkmtp, cmd, ver, joy_load, joy_unload, joy_stat);
   }
   
   #endif /* JOY_MODULE */
   
   
   #endif /* NJOY > 0 */

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