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
28MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
29MODULE_DESCRIPTION("Amiga mouse driver");
30MODULE_LICENSE("GPL");
31
32static int amimouse_lastx, amimouse_lasty;
33
34static 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
70static 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
88static void amimouse_close(struct input_dev *dev)
89{
90	free_irq(IRQ_AMIGA_VERTB, dev);
91}
92
93static 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
128static void __exit amimouse_remove(struct platform_device *pdev)
129{
130	struct input_dev *dev = platform_get_drvdata(pdev);
131
132	input_unregister_device(dev);
133}
134
135static struct platform_driver amimouse_driver = {
136	.remove_new = __exit_p(amimouse_remove),
137	.driver   = {
138		.name	= "amiga-mouse",
139	},
140};
141
142module_platform_driver_probe(amimouse_driver, amimouse_probe);
143
144MODULE_ALIAS("platform:amiga-mouse");
145