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amimouse.c

/*
 *  Amiga mouse driver for Linux/m68k
 *
 *  Copyright (c) 2000-2002 Vojtech Pavlik
 *
 *  Based on the work of:
 *    Michael Rausch          James Banks
 *    Matther Dillon          David Giller
 *    Nathan Laredo           Linus Torvalds
 *    Johan Myreen            Jes Sorensen
 *    Russell King
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>

#include <asm/irq.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Amiga mouse driver");
MODULE_LICENSE("GPL");

static int amimouse_lastx, amimouse_lasty;
static struct input_dev *amimouse_dev;

static irqreturn_t amimouse_interrupt(int irq, void *dummy)
{
      unsigned short joy0dat, potgor;
      int nx, ny, dx, dy;

      joy0dat = amiga_custom.joy0dat;

      nx = joy0dat & 0xff;
      ny = joy0dat >> 8;

      dx = nx - amimouse_lastx;
      dy = ny - amimouse_lasty;

      if (dx < -127) dx = (256 + nx) - amimouse_lastx;
      if (dx >  127) dx = (nx - 256) - amimouse_lastx;
      if (dy < -127) dy = (256 + ny) - amimouse_lasty;
      if (dy >  127) dy = (ny - 256) - amimouse_lasty;

      amimouse_lastx = nx;
      amimouse_lasty = ny;

      potgor = amiga_custom.potgor;

      input_report_rel(amimouse_dev, REL_X, dx);
      input_report_rel(amimouse_dev, REL_Y, dy);

      input_report_key(amimouse_dev, BTN_LEFT,   ciaa.pra & 0x40);
      input_report_key(amimouse_dev, BTN_MIDDLE, potgor & 0x0100);
      input_report_key(amimouse_dev, BTN_RIGHT,  potgor & 0x0400);

      input_sync(amimouse_dev);

      return IRQ_HANDLED;
}

static int amimouse_open(struct input_dev *dev)
{
      unsigned short joy0dat;

      joy0dat = amiga_custom.joy0dat;

      amimouse_lastx = joy0dat & 0xff;
      amimouse_lasty = joy0dat >> 8;

      if (request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse", amimouse_interrupt)) {
                printk(KERN_ERR "amimouse.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
                return -EBUSY;
        }

        return 0;
}

static void amimouse_close(struct input_dev *dev)
{
      free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt);
}

static int __init amimouse_init(void)
{
      int err;

      if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
            return -ENODEV;

      amimouse_dev = input_allocate_device();
      if (!amimouse_dev)
            return -ENOMEM;

      amimouse_dev->name = "Amiga mouse";
      amimouse_dev->phys = "amimouse/input0";
      amimouse_dev->id.bustype = BUS_AMIGA;
      amimouse_dev->id.vendor = 0x0001;
      amimouse_dev->id.product = 0x0002;
      amimouse_dev->id.version = 0x0100;

      amimouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
      amimouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
      amimouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
            BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
      amimouse_dev->open = amimouse_open;
      amimouse_dev->close = amimouse_close;

      err = input_register_device(amimouse_dev);
      if (err) {
            input_free_device(amimouse_dev);
            return err;
      }

      return 0;
}

static void __exit amimouse_exit(void)
{
        input_unregister_device(amimouse_dev);
}

module_init(amimouse_init);
module_exit(amimouse_exit);

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