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/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;
  37
  38static irqreturn_t amimouse_interrupt(int irq, void *data)
  39{
  40        struct input_dev *dev = data;
  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(dev, REL_X, dx);
  63        input_report_rel(dev, REL_Y, dy);
  64
  65        input_report_key(dev, BTN_LEFT,   ciaa.pra & 0x40);
  66        input_report_key(dev, BTN_MIDDLE, potgor & 0x0100);
  67        input_report_key(dev, BTN_RIGHT,  potgor & 0x0400);
  68
  69        input_sync(dev);
  70
  71        return IRQ_HANDLED;
  72}
  73
  74static int amimouse_open(struct input_dev *dev)
  75{
  76        unsigned short joy0dat;
  77        int error;
  78
  79        joy0dat = amiga_custom.joy0dat;
  80
  81        amimouse_lastx = joy0dat & 0xff;
  82        amimouse_lasty = joy0dat >> 8;
  83
  84        error = request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse",
  85                            dev);
  86        if (error)
  87                dev_err(&dev->dev, "Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
  88
  89        return error;
  90}
  91
  92static void amimouse_close(struct input_dev *dev)
  93{
  94        free_irq(IRQ_AMIGA_VERTB, dev);
  95}
  96
  97static int __init amimouse_probe(struct platform_device *pdev)
  98{
  99        int err;
 100        struct input_dev *dev;
 101
 102        dev = input_allocate_device();
 103        if (!dev)
 104                return -ENOMEM;
 105
 106        dev->name = pdev->name;
 107        dev->phys = "amimouse/input0";
 108        dev->id.bustype = BUS_AMIGA;
 109        dev->id.vendor = 0x0001;
 110        dev->id.product = 0x0002;
 111        dev->id.version = 0x0100;
 112
 113        dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 114        dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 115        dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 116                BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 117        dev->open = amimouse_open;
 118        dev->close = amimouse_close;
 119        dev->dev.parent = &pdev->dev;
 120
 121        err = input_register_device(dev);
 122        if (err) {
 123                input_free_device(dev);
 124                return err;
 125        }
 126
 127        platform_set_drvdata(pdev, dev);
 128
 129        return 0;
 130}
 131
 132static int __exit amimouse_remove(struct platform_device *pdev)
 133{
 134        struct input_dev *dev = platform_get_drvdata(pdev);
 135
 136        input_unregister_device(dev);
 137        return 0;
 138}
 139
 140static struct platform_driver amimouse_driver = {
 141        .remove = __exit_p(amimouse_remove),
 142        .driver   = {
 143                .name   = "amiga-mouse",
 144        },
 145};
 146
 147module_platform_driver_probe(amimouse_driver, amimouse_probe);
 148
 149MODULE_ALIAS("platform:amiga-mouse");
 150