LXR linux/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
  32MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  33MODULE_DESCRIPTION("Amiga mouse driver");
  34MODULE_LICENSE("GPL");
  35
  36static int amimouse_lastx, amimouse_lasty;
  37static struct input_dev *amimouse_dev;
  38
  39static irqreturn_t amimouse_interrupt(int irq, void *dummy)
  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_report_rel(amimouse_dev, REL_X, dx);
  63        input_report_rel(amimouse_dev, REL_Y, dy);
  64
  65        input_report_key(amimouse_dev, BTN_LEFT,   ciaa.pra & 0x40);
  66        input_report_key(amimouse_dev, BTN_MIDDLE, potgor & 0x0100);
  67        input_report_key(amimouse_dev, BTN_RIGHT,  potgor & 0x0400);
  68
  69        input_sync(amimouse_dev);
  70
  71        return IRQ_HANDLED;
  72}
  73
  74static int amimouse_open(struct input_dev *dev)
  75{
  76        unsigned short joy0dat;
  77
  78        joy0dat = amiga_custom.joy0dat;
  79
  80        amimouse_lastx = joy0dat & 0xff;
  81        amimouse_lasty = joy0dat >> 8;
  82
  83        if (request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse", amimouse_interrupt)) {
  84                printk(KERN_ERR "amimouse.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
  85                return -EBUSY;
  86        }
  87
  88        return 0;
  89}
  90
  91static void amimouse_close(struct input_dev *dev)
  92{
  93        free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt);
  94}
  95
  96static int __init amimouse_init(void)
  97{
  98        int err;
  99
 100        if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
 101                return -ENODEV;
 102
 103        amimouse_dev = input_allocate_device();
 104        if (!amimouse_dev)
 105                return -ENOMEM;
 106
 107        amimouse_dev->name = "Amiga mouse";
 108        amimouse_dev->phys = "amimouse/input0";
 109        amimouse_dev->id.bustype = BUS_AMIGA;
 110        amimouse_dev->id.vendor = 0x0001;
 111        amimouse_dev->id.product = 0x0002;
 112        amimouse_dev->id.version = 0x0100;
 113
 114        amimouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 115        amimouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 116        amimouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 117                BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 118        amimouse_dev->open = amimouse_open;
 119        amimouse_dev->close = amimouse_close;
 120
 121        err = input_register_device(amimouse_dev);
 122        if (err) {
 123                input_free_device(amimouse_dev);
 124                return err;
 125        }
 126
 127        return 0;
 128}
 129
 130static void __exit amimouse_exit(void)
 131{
 132        input_unregister_device(amimouse_dev);
 133}
 134
 135module_init(amimouse_init);
 136module_exit(amimouse_exit);
 137