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
  33 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  34 MODULE_DESCRIPTION("Amiga mouse driver");
  35 MODULE_LICENSE("GPL");
  36
  37 static int amimouse_lastx, amimouse_lasty;
  38
  39 static 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
  75 static 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
  93 static void amimouse_close(struct input_dev *dev)
  94 {
  95         free_irq(IRQ_AMIGA_VERTB, dev);
  96 }
  97
  98 static 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
 133 static 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
 142 static struct platform_driver amimouse_driver = {
 143         .remove = __exit_p(amimouse_remove),
 144         .driver   = {
 145                 .name   = "amiga-mouse",
 146                 .owner  = THIS_MODULE,
 147         },
 148 };
 149
 150 static int __init amimouse_init(void)
 151 {
 152         return platform_driver_probe(&amimouse_driver, amimouse_probe);
 153 }
 154
 155 module_init(amimouse_init);
 156
 157 static void __exit amimouse_exit(void)
 158 {
 159         platform_driver_unregister(&amimouse_driver);
 160 }
 161
 162 module_exit(amimouse_exit);
 163
 164 MODULE_ALIAS("platform:amiga-mouse");