i386/linux/linux-2.3.21/drivers/char/atarimouse.c

   1 /*
   2  * Atari Mouse Driver for Linux
   3  * by Robert de Vries (robert@and.nl) 19Jul93
   4  *
   5  * 16 Nov 1994 Andreas Schwab
   6  * Compatibility with busmouse
   7  * Support for three button mouse (shamelessly stolen from MiNT)
   8  * third button wired to one of the joystick directions on joystick 1
   9  *
  10  * 1996/02/11 Andreas Schwab
  11  * Module support
  12  * Allow multiple open's
  13  *
  14  * Converted to use new generic busmouse code.  5 Apr 1998
  15  *   Russell King <rmk@arm.uk.linux.org>
  16  */
  17
  18 #include <linux/module.h>
  19
  20 #include <linux/sched.h>
  21 #include <linux/errno.h>
  22 #include <linux/miscdevice.h>
  23 #include <linux/mm.h>
  24 #include <linux/random.h>
  25 #include <linux/poll.h>
  26 #include <linux/init.h>
  27 #include <linux/logibusmouse.h>
  28
  29 #include <asm/setup.h>
  30 #include <asm/atarikb.h>
  31 #include <asm/uaccess.h>
  32
  33 #include "busmouse.h"
  34
  35 static int msedev;
  36 static int mouse_threshold[2] = {2,2};
  37 MODULE_PARM(mouse_threshold, "2i");
  38 extern int atari_mouse_buttons;
  39
  40 static void atari_mouse_interrupt(char *buf)
  41 {
  42     int buttons;
  43
  44 /*    ikbd_mouse_disable(); */
  45
  46     buttons = ((buf[0] & 1)
  47                | ((buf[0] & 2) << 1)
  48                | (atari_mouse_buttons & 2));
  49     atari_mouse_buttons = buttons;
  50
  51     busmouse_add_movementbuttons(msedev, buf[1], -buf[2], buttons ^ 7);
  52 /*    ikbd_mouse_rel_pos(); */
  53 }
  54
  55 static int release_mouse(struct inode *inode, struct file *file)
  56 {
  57     ikbd_mouse_disable();
  58
  59     atari_mouse_interrupt_hook = NULL;
  60     MOD_DEC_USE_COUNT;
  61     return 0;
  62 }
  63
  64 static int open_mouse(struct inode *inode, struct file *file)
  65 {
  66     atari_mouse_buttons = 0;
  67     ikbd_mouse_y0_top ();
  68     ikbd_mouse_thresh (mouse_threshold[0], mouse_threshold[1]);
  69     ikbd_mouse_rel_pos();
  70     MOD_INC_USE_COUNT;
  71     atari_mouse_interrupt_hook = atari_mouse_interrupt;
  72     return 0;
  73 }
  74
  75 static struct busmouse atarimouse = {
  76         ATARIMOUSE_MINOR, "atarimouse", open_mouse, release_mouse, 0
  77 };
  78
  79 int __init atari_mouse_init(void)
  80 {
  81     if (!MACH_IS_ATARI)
  82         return -ENODEV;
  83     msedev = register_busmouse(&atarimouse);
  84     if (msedev < 0)
  85         printk(KERN_WARNING "Unable to register Atari mouse driver.\n");
  86     else
  87         printk(KERN_INFO "Atari mouse installed.\n");
  88     return msedev < 0 ? msedev : 0;
  89 }
  90
  91
  92 #define MIN_THRESHOLD 1
  93 #define MAX_THRESHOLD 20        /* more seems not reasonable... */
  94
  95 void __init atari_mouse_setup( char *str, int *ints )
  96 {
  97     if (ints[0] < 1) {
  98         printk( "atari_mouse_setup: no arguments!\n" );
  99         return;
 100     }
 101     else if (ints[0] > 2) {
 102         printk( "atari_mouse_setup: too many arguments\n" );
 103     }
 104
 105     if (ints[1] < MIN_THRESHOLD || ints[1] > MAX_THRESHOLD)
 106         printk( "atari_mouse_setup: bad threshold value (ignored)\n" );
 107     else {
 108         mouse_threshold[0] = ints[1];
 109         mouse_threshold[1] = ints[1];
 110         if (ints[0] > 1) {
 111             if (ints[2] < MIN_THRESHOLD || ints[2] > MAX_THRESHOLD)
 112                 printk("atari_mouse_setup: bad threshold value (ignored)\n" );
 113             else
 114                 mouse_threshold[1] = ints[2];
 115         }
 116     }
 117
 118 }
 119
 120 #ifdef MODULE
 121 int init_module(void)
 122 {
 123         return atari_mouse_init();
 124 }
 125
 126 void cleanup_module(void)
 127 {
 128         unregister_busmouse(msedev);
 129 }
 130 #endif