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#include <linux/platform_device.h>
  25
  26#include <asm/irq.h>
  27#include <asm/setup.h>
  28#include <asm/system.h>
  29#include <asm/uaccess.h>
  30#include <asm/amigahw.h>
  31#include <asm/amigaints.h>
  32
  33MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  34MODULE_DESCRIPTION("Amiga mouse driver");
  35MODULE_LICENSE("GPL");
  36
  37static int amimouse_lastx, amimouse_lasty;
  38
  39static irqreturn_t amimouse_interrupt(int irq, void *data)
  40{
  41        struct input_dev *dev = data;
  42        unsigned short joy0dat, potgor;
  43        int nx, ny, dx, dy;
  44
  45        joy0dat = amiga_custom.joy0dat;
  46
  47        nx = joy0dat & 0xff;
  48        ny = joy0dat >> 8;
  49
  50        dx = nx - amimouse_lastx;
  51        dy = ny - amimouse_lasty;
  52
  53        if (dx < -127) dx = (256 + nx) - amimouse_lastx;
  54        if (dx >  127) dx = (nx - 256) - amimouse_lastx;
  55        if (dy < -127) dy = (256 + ny) - amimouse_lasty;
  56        if (dy >  127) dy = (ny - 256) - amimouse_lasty;
  57
  58        amimouse_lastx = nx;
  59        amimouse_lasty = ny;
  60
  61        potgor = amiga_custom.potgor;
  62
  63        input_report_rel(dev, REL_X, dx);
  64        input_report_rel(dev, REL_Y, dy);
  65
  66        input_report_key(dev, BTN_LEFT,   ciaa.pra & 0x40);
  67        input_report_key(dev, BTN_MIDDLE, potgor & 0x0100);
  68        input_report_key(dev, BTN_RIGHT,  potgor & 0x0400);
  69
  70        input_sync(dev);
  71
  72        return IRQ_HANDLED;
  73}
  74
  75static int amimouse_open(struct input_dev *dev)
  76{
  77        unsigned short joy0dat;
  78        int error;
  79
  80        joy0dat = amiga_custom.joy0dat;
  81
  82        amimouse_lastx = joy0dat & 0xff;
  83        amimouse_lasty = joy0dat >> 8;
  84
  85        error = request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse",
  86                            dev);
  87        if (error)
  88                dev_err(&dev->dev, "Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
  89
  90        return error;
  91}
  92
  93static void amimouse_close(struct input_dev *dev)
  94{
  95        free_irq(IRQ_AMIGA_VERTB, dev);
  96}
  97
  98static int __init amimouse_probe(struct platform_device *pdev)
  99{
 100        int err;
 101        struct input_dev *dev;
 102
 103        dev = input_allocate_device();
 104        if (!dev)
 105                return -ENOMEM;
 106
 107        dev->name = pdev->name;
 108        dev->phys = "amimouse/input0";
 109        dev->id.bustype = BUS_AMIGA;
 110        dev->id.vendor = 0x0001;
 111        dev->id.product = 0x0002;
 112        dev->id.version = 0x0100;
 113
 114        dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 115        dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 116        dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 117                BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 118        dev->open = amimouse_open;
 119        dev->close = amimouse_close;
 120        dev->dev.parent = &pdev->dev;
 121
 122        err = input_register_device(dev);
 123        if (err) {
 124                input_free_device(dev);
 125                return err;
 126        }
 127
 128        platform_set_drvdata(pdev, dev);
 129
 130        return 0;
 131}
 132
 133static int __exit amimouse_remove(struct platform_device *pdev)
 134{
 135        struct input_dev *dev = platform_get_drvdata(pdev);
 136
 137        platform_set_drvdata(pdev, NULL);
 138        input_unregister_device(dev);
 139        return 0;
 140}
 141
 142static struct platform_driver amimouse_driver = {
 143        .remove = __exit_p(amimouse_remove),
 144        .driver   = {
 145                .name   = "amiga-mouse",
 146                .owner  = THIS_MODULE,
 147        },
 148};
 149
 150static int __init amimouse_init(void)
 151{
 152        return platform_driver_probe(&amimouse_driver, amimouse_probe);
 153}
 154
 155module_init(amimouse_init);
 156
 157static void __exit amimouse_exit(void)
 158{
 159        platform_driver_unregister(&amimouse_driver);
 160}
 161
 162module_exit(amimouse_exit);
 163
 164MODULE_ALIAS("platform:amiga-mouse");
 165