drivers/input/mouse/atarimouse.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Atari mouse driver for Linux/m68k
 *
 *  Copyright (c) 2005 Michael Schmitz
 *
 *  Based on:
 *  Amiga mouse driver for Linux/m68k
 *
 *  Copyright (c) 2000-2002 Vojtech Pavlik
 */
/*
 * The low level init and interrupt stuff is handled in arch/mm68k/atari/atakeyb.c
 * (the keyboard ACIA also handles the mouse and joystick data, and the keyboard
 * interrupt is shared with the MIDI ACIA so MIDI data also get handled there).
 * This driver only deals with handing key events off to the input layer.
 *
 * Largely based on the old:
 *
 * Atari Mouse Driver for Linux
 * by Robert de Vries (robert@and.nl) 19Jul93
 *
 * 16 Nov 1994 Andreas Schwab
 * Compatibility with busmouse
 * Support for three button mouse (shamelessly stolen from MiNT)
 * third button wired to one of the joystick directions on joystick 1
 *
 * 1996/02/11 Andreas Schwab
 * Module support
 * Allow multiple open's
 *
 * Converted to use new generic busmouse code.  5 Apr 1998
 *   Russell King <rmk@arm.uk.linux.org>
 */



#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>

#include <asm/irq.h>
#include <asm/setup.h>
#include <linux/uaccess.h>
#include <asm/atarihw.h>
#include <asm/atarikb.h>
#include <asm/atariints.h>

MODULE_AUTHOR("Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>");
MODULE_DESCRIPTION("Atari mouse driver");
MODULE_LICENSE("GPL");

static int mouse_threshold[2] = {2, 2};
module_param_array(mouse_threshold, int, NULL, 0);

#ifdef FIXED_ATARI_JOYSTICK
extern int atari_mouse_buttons;
#endif

static struct input_dev *atamouse_dev;

static void atamouse_interrupt(char *buf)
{
	int buttons, dx, dy;

	buttons = (buf[0] & 1) | ((buf[0] & 2) << 1);
#ifdef FIXED_ATARI_JOYSTICK
	buttons |= atari_mouse_buttons & 2;
	atari_mouse_buttons = buttons;
#endif

	/* only relative events get here */
	dx = buf[1];
	dy = buf[2];

	input_report_rel(atamouse_dev, REL_X, dx);
	input_report_rel(atamouse_dev, REL_Y, dy);

	input_report_key(atamouse_dev, BTN_LEFT,   buttons & 0x4);
	input_report_key(atamouse_dev, BTN_MIDDLE, buttons & 0x2);
	input_report_key(atamouse_dev, BTN_RIGHT,  buttons & 0x1);

	input_sync(atamouse_dev);

	return;
}

static int atamouse_open(struct input_dev *dev)
{
#ifdef FIXED_ATARI_JOYSTICK
	atari_mouse_buttons = 0;
#endif
	ikbd_mouse_y0_top();
	ikbd_mouse_thresh(mouse_threshold[0], mouse_threshold[1]);
	ikbd_mouse_rel_pos();
	atari_input_mouse_interrupt_hook = atamouse_interrupt;

	return 0;
}

static void atamouse_close(struct input_dev *dev)
{
	ikbd_mouse_disable();
	atari_input_mouse_interrupt_hook = NULL;
}

static int __init atamouse_init(void)
{
	int error;

	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ST_MFP))
		return -ENODEV;

	error = atari_keyb_init();
	if (error)
		return error;

	atamouse_dev = input_allocate_device();
	if (!atamouse_dev)
		return -ENOMEM;

	atamouse_dev->name = "Atari mouse";
	atamouse_dev->phys = "atamouse/input0";
	atamouse_dev->id.bustype = BUS_HOST;
	atamouse_dev->id.vendor = 0x0001;
	atamouse_dev->id.product = 0x0002;
	atamouse_dev->id.version = 0x0100;

	atamouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	atamouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
	atamouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);

	atamouse_dev->open = atamouse_open;
	atamouse_dev->close = atamouse_close;

	error = input_register_device(atamouse_dev);
	if (error) {
		input_free_device(atamouse_dev);
		return error;
	}

	return 0;
}

static void __exit atamouse_exit(void)
{
	input_unregister_device(atamouse_dev);
}

module_init(atamouse_init);
module_exit(atamouse_exit);