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 <linux/uaccess.h>
  29 #include <asm/amigahw.h>
  30 #include <asm/amigaints.h>
  31
  32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  33 MODULE_DESCRIPTION("Amiga mouse driver");
  34 MODULE_LICENSE("GPL");
  35
  36 static int amimouse_lastx, amimouse_lasty;
  37
  38 static 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
  74 static 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
  92 static void amimouse_close(struct input_dev *dev)
  93 {
  94         free_irq(IRQ_AMIGA_VERTB, dev);
  95 }
  96
  97 static 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
 132 static 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
 140 static struct platform_driver amimouse_driver = {
 141         .remove = __exit_p(amimouse_remove),
 142         .driver   = {
 143                 .name   = "amiga-mouse",
 144         },
 145 };
 146
 147 module_platform_driver_probe(amimouse_driver, amimouse_probe);
 148
 149 MODULE_ALIAS("platform:amiga-mouse");