drivers/input/mouse/amimouse.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Amiga mouse driver for Linux/m68k
   4  *
   5  *  Copyright (c) 2000-2002 Vojtech Pavlik
   6  *
   7  *  Based on the work of:
   8  *      Michael Rausch          James Banks
   9  *      Matther Dillon          David Giller
  10  *      Nathan Laredo           Linus Torvalds
  11  *      Johan Myreen            Jes Sorensen
  12  *      Russell King
  13  */
  14
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/input.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21
  22 #include <asm/irq.h>
  23 #include <asm/setup.h>
  24 #include <linux/uaccess.h>
  25 #include <asm/amigahw.h>
  26 #include <asm/amigaints.h>
  27
  28 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  29 MODULE_DESCRIPTION("Amiga mouse driver");
  30 MODULE_LICENSE("GPL");
  31
  32 static int amimouse_lastx, amimouse_lasty;
  33
  34 static irqreturn_t amimouse_interrupt(int irq, void *data)
  35 {
  36         struct input_dev *dev = data;
  37         unsigned short joy0dat, potgor;
  38         int nx, ny, dx, dy;
  39
  40         joy0dat = amiga_custom.joy0dat;
  41
  42         nx = joy0dat & 0xff;
  43         ny = joy0dat >> 8;
  44
  45         dx = nx - amimouse_lastx;
  46         dy = ny - amimouse_lasty;
  47
  48         if (dx < -127) dx = (256 + nx) - amimouse_lastx;
  49         if (dx >  127) dx = (nx - 256) - amimouse_lastx;
  50         if (dy < -127) dy = (256 + ny) - amimouse_lasty;
  51         if (dy >  127) dy = (ny - 256) - amimouse_lasty;
  52
  53         amimouse_lastx = nx;
  54         amimouse_lasty = ny;
  55
  56         potgor = amiga_custom.potgor;
  57
  58         input_report_rel(dev, REL_X, dx);
  59         input_report_rel(dev, REL_Y, dy);
  60
  61         input_report_key(dev, BTN_LEFT,   ciaa.pra & 0x40);
  62         input_report_key(dev, BTN_MIDDLE, potgor & 0x0100);
  63         input_report_key(dev, BTN_RIGHT,  potgor & 0x0400);
  64
  65         input_sync(dev);
  66
  67         return IRQ_HANDLED;
  68 }
  69
  70 static int amimouse_open(struct input_dev *dev)
  71 {
  72         unsigned short joy0dat;
  73         int error;
  74
  75         joy0dat = amiga_custom.joy0dat;
  76
  77         amimouse_lastx = joy0dat & 0xff;
  78         amimouse_lasty = joy0dat >> 8;
  79
  80         error = request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse",
  81                             dev);
  82         if (error)
  83                 dev_err(&dev->dev, "Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
  84
  85         return error;
  86 }
  87
  88 static void amimouse_close(struct input_dev *dev)
  89 {
  90         free_irq(IRQ_AMIGA_VERTB, dev);
  91 }
  92
  93 static int __init amimouse_probe(struct platform_device *pdev)
  94 {
  95         int err;
  96         struct input_dev *dev;
  97
  98         dev = input_allocate_device();
  99         if (!dev)
 100                 return -ENOMEM;
 101
 102         dev->name = pdev->name;
 103         dev->phys = "amimouse/input0";
 104         dev->id.bustype = BUS_AMIGA;
 105         dev->id.vendor = 0x0001;
 106         dev->id.product = 0x0002;
 107         dev->id.version = 0x0100;
 108
 109         dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 110         dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 111         dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 112                 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 113         dev->open = amimouse_open;
 114         dev->close = amimouse_close;
 115         dev->dev.parent = &pdev->dev;
 116
 117         err = input_register_device(dev);
 118         if (err) {
 119                 input_free_device(dev);
 120                 return err;
 121         }
 122
 123         platform_set_drvdata(pdev, dev);
 124
 125         return 0;
 126 }
 127
 128 static int __exit amimouse_remove(struct platform_device *pdev)
 129 {
 130         struct input_dev *dev = platform_get_drvdata(pdev);
 131
 132         input_unregister_device(dev);
 133         return 0;
 134 }
 135
 136 static struct platform_driver amimouse_driver = {
 137         .remove = __exit_p(amimouse_remove),
 138         .driver   = {
 139                 .name   = "amiga-mouse",
 140         },
 141 };
 142
 143 module_platform_driver_probe(amimouse_driver, amimouse_probe);
 144
 145 MODULE_ALIAS("platform:amiga-mouse");