drivers/input/mouse/amimouse.c

   1 /*
   2  *  Amiga mouse driver for Linux/m68k
   3  *
   4  *  Copyright (c) 2000-2002 Vojtech Pavlik
   5  *
   6  *  Based on the work of:
   7  *      Michael Rausch          James Banks
   8  *      Matther Dillon          David Giller
   9  *      Nathan Laredo           Linus Torvalds
  10  *      Johan Myreen            Jes Sorensen
  11  *      Russell King
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License version 2 as published by
  17  * the Free Software Foundation
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/input.h>
  23 #include <linux/interrupt.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/setup.h>
  27 #include <asm/system.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/amigahw.h>
  30 #include <asm/amigaints.h>
  31
  32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  33 MODULE_DESCRIPTION("Amiga mouse driver");
  34 MODULE_LICENSE("GPL");
  35
  36 static int amimouse_lastx, amimouse_lasty;
  37 static struct input_dev *amimouse_dev;
  38
  39 static irqreturn_t amimouse_interrupt(int irq, void *dummy, struct pt_regs *fp)
  40 {
  41         unsigned short joy0dat, potgor;
  42         int nx, ny, dx, dy;
  43
  44         joy0dat = amiga_custom.joy0dat;
  45
  46         nx = joy0dat & 0xff;
  47         ny = joy0dat >> 8;
  48
  49         dx = nx - amimouse_lastx;
  50         dy = ny - amimouse_lasty;
  51
  52         if (dx < -127) dx = (256 + nx) - amimouse_lastx;
  53         if (dx >  127) dx = (nx - 256) - amimouse_lastx;
  54         if (dy < -127) dy = (256 + ny) - amimouse_lasty;
  55         if (dy >  127) dy = (ny - 256) - amimouse_lasty;
  56
  57         amimouse_lastx = nx;
  58         amimouse_lasty = ny;
  59
  60         potgor = amiga_custom.potgor;
  61
  62         input_regs(amimouse_dev, fp);
  63
  64         input_report_rel(amimouse_dev, REL_X, dx);
  65         input_report_rel(amimouse_dev, REL_Y, dy);
  66
  67         input_report_key(amimouse_dev, BTN_LEFT,   ciaa.pra & 0x40);
  68         input_report_key(amimouse_dev, BTN_MIDDLE, potgor & 0x0100);
  69         input_report_key(amimouse_dev, BTN_RIGHT,  potgor & 0x0400);
  70
  71         input_sync(amimouse_dev);
  72
  73         return IRQ_HANDLED;
  74 }
  75
  76 static int amimouse_open(struct input_dev *dev)
  77 {
  78         unsigned short joy0dat;
  79
  80         joy0dat = amiga_custom.joy0dat;
  81
  82         amimouse_lastx = joy0dat & 0xff;
  83         amimouse_lasty = joy0dat >> 8;
  84
  85         if (request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse", amimouse_interrupt)) {
  86                 printk(KERN_ERR "amimouse.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
  87                 return -EBUSY;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static void amimouse_close(struct input_dev *dev)
  94 {
  95         free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt);
  96 }
  97
  98 static int __init amimouse_init(void)
  99 {
 100         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
 101                 return -ENODEV;
 102
 103         if (!(amimouse_dev = input_allocate_device()))
 104                 return -ENOMEM;
 105
 106         amimouse_dev->name = "Amiga mouse";
 107         amimouse_dev->phys = "amimouse/input0";
 108         amimouse_dev->id.bustype = BUS_AMIGA;
 109         amimouse_dev->id.vendor = 0x0001;
 110         amimouse_dev->id.product = 0x0002;
 111         amimouse_dev->id.version = 0x0100;
 112
 113         amimouse_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
 114         amimouse_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
 115         amimouse_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
 116         amimouse_dev->open = amimouse_open;
 117         amimouse_dev->close = amimouse_close;
 118
 119         input_register_device(amimouse_dev);
 120
 121         return 0;
 122 }
 123
 124 static void __exit amimouse_exit(void)
 125 {
 126         input_unregister_device(amimouse_dev);
 127 }
 128
 129 module_init(amimouse_init);
 130 module_exit(amimouse_exit);