LXR linux/drivers/input/mouse/atarimouse.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Atari mouse driver for Linux/m68k
   4 *
   5 *  Copyright (c) 2005 Michael Schmitz
   6 *
   7 *  Based on:
   8 *  Amiga mouse driver for Linux/m68k
   9 *
  10 *  Copyright (c) 2000-2002 Vojtech Pavlik
  11 */
  12/*
  13 * The low level init and interrupt stuff is handled in arch/mm68k/atari/atakeyb.c
  14 * (the keyboard ACIA also handles the mouse and joystick data, and the keyboard
  15 * interrupt is shared with the MIDI ACIA so MIDI data also get handled there).
  16 * This driver only deals with handing key events off to the input layer.
  17 *
  18 * Largely based on the old:
  19 *
  20 * Atari Mouse Driver for Linux
  21 * by Robert de Vries (robert@and.nl) 19Jul93
  22 *
  23 * 16 Nov 1994 Andreas Schwab
  24 * Compatibility with busmouse
  25 * Support for three button mouse (shamelessly stolen from MiNT)
  26 * third button wired to one of the joystick directions on joystick 1
  27 *
  28 * 1996/02/11 Andreas Schwab
  29 * Module support
  30 * Allow multiple open's
  31 *
  32 * Converted to use new generic busmouse code.  5 Apr 1998
  33 *   Russell King <rmk@arm.uk.linux.org>
  34 */
  35
  36
  37
  38#include <linux/module.h>
  39#include <linux/init.h>
  40#include <linux/input.h>
  41#include <linux/interrupt.h>
  42
  43#include <asm/irq.h>
  44#include <asm/setup.h>
  45#include <linux/uaccess.h>
  46#include <asm/atarihw.h>
  47#include <asm/atarikb.h>
  48#include <asm/atariints.h>
  49
  50MODULE_AUTHOR("Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>");
  51MODULE_DESCRIPTION("Atari mouse driver");
  52MODULE_LICENSE("GPL");
  53
  54static int mouse_threshold[2] = {2, 2};
  55module_param_array(mouse_threshold, int, NULL, 0);
  56
  57#ifdef FIXED_ATARI_JOYSTICK
  58extern int atari_mouse_buttons;
  59#endif
  60
  61static struct input_dev *atamouse_dev;
  62
  63static void atamouse_interrupt(char *buf)
  64{
  65        int buttons, dx, dy;
  66
  67        buttons = (buf[0] & 1) | ((buf[0] & 2) << 1);
  68#ifdef FIXED_ATARI_JOYSTICK
  69        buttons |= atari_mouse_buttons & 2;
  70        atari_mouse_buttons = buttons;
  71#endif
  72
  73        /* only relative events get here */
  74        dx = buf[1];
  75        dy = buf[2];
  76
  77        input_report_rel(atamouse_dev, REL_X, dx);
  78        input_report_rel(atamouse_dev, REL_Y, dy);
  79
  80        input_report_key(atamouse_dev, BTN_LEFT,   buttons & 0x4);
  81        input_report_key(atamouse_dev, BTN_MIDDLE, buttons & 0x2);
  82        input_report_key(atamouse_dev, BTN_RIGHT,  buttons & 0x1);
  83
  84        input_sync(atamouse_dev);
  85
  86        return;
  87}
  88
  89static int atamouse_open(struct input_dev *dev)
  90{
  91#ifdef FIXED_ATARI_JOYSTICK
  92        atari_mouse_buttons = 0;
  93#endif
  94        ikbd_mouse_y0_top();
  95        ikbd_mouse_thresh(mouse_threshold[0], mouse_threshold[1]);
  96        ikbd_mouse_rel_pos();
  97        atari_input_mouse_interrupt_hook = atamouse_interrupt;
  98
  99        return 0;
 100}
 101
 102static void atamouse_close(struct input_dev *dev)
 103{
 104        ikbd_mouse_disable();
 105        atari_input_mouse_interrupt_hook = NULL;
 106}
 107
 108static int __init atamouse_init(void)
 109{
 110        int error;
 111
 112        if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ST_MFP))
 113                return -ENODEV;
 114
 115        error = atari_keyb_init();
 116        if (error)
 117                return error;
 118
 119        atamouse_dev = input_allocate_device();
 120        if (!atamouse_dev)
 121                return -ENOMEM;
 122
 123        atamouse_dev->name = "Atari mouse";
 124        atamouse_dev->phys = "atamouse/input0";
 125        atamouse_dev->id.bustype = BUS_HOST;
 126        atamouse_dev->id.vendor = 0x0001;
 127        atamouse_dev->id.product = 0x0002;
 128        atamouse_dev->id.version = 0x0100;
 129
 130        atamouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 131        atamouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 132        atamouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 133                BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 134
 135        atamouse_dev->open = atamouse_open;
 136        atamouse_dev->close = atamouse_close;
 137
 138        error = input_register_device(atamouse_dev);
 139        if (error) {
 140                input_free_device(atamouse_dev);
 141                return error;
 142        }
 143
 144        return 0;
 145}
 146
 147static void __exit atamouse_exit(void)
 148{
 149        input_unregister_device(atamouse_dev);
 150}
 151
 152module_init(atamouse_init);
 153module_exit(atamouse_exit);
 154