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 <asm/system.h>
29#include <asm/uaccess.h>
30#include <asm/amigahw.h>
31#include <asm/amigaints.h>
32
33MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
34MODULE_DESCRIPTION("Amiga mouse driver");
35MODULE_LICENSE("GPL");
36
37static int amimouse_lastx, amimouse_lasty;
38
39static irqreturn_t amimouse_interrupt(int irq, void *data)
40{
41	struct input_dev *dev = data;
42	unsigned short joy0dat, potgor;
43	int nx, ny, dx, dy;
44
45	joy0dat = amiga_custom.joy0dat;
46
47	nx = joy0dat & 0xff;
48	ny = joy0dat >> 8;
49
50	dx = nx - amimouse_lastx;
51	dy = ny - amimouse_lasty;
52
53	if (dx < -127) dx = (256 + nx) - amimouse_lastx;
54	if (dx >  127) dx = (nx - 256) - amimouse_lastx;
55	if (dy < -127) dy = (256 + ny) - amimouse_lasty;
56	if (dy >  127) dy = (ny - 256) - amimouse_lasty;
57
58	amimouse_lastx = nx;
59	amimouse_lasty = ny;
60
61	potgor = amiga_custom.potgor;
62
63	input_report_rel(dev, REL_X, dx);
64	input_report_rel(dev, REL_Y, dy);
65
66	input_report_key(dev, BTN_LEFT,   ciaa.pra & 0x40);
67	input_report_key(dev, BTN_MIDDLE, potgor & 0x0100);
68	input_report_key(dev, BTN_RIGHT,  potgor & 0x0400);
69
70	input_sync(dev);
71
72	return IRQ_HANDLED;
73}
74
75static int amimouse_open(struct input_dev *dev)
76{
77	unsigned short joy0dat;
78	int error;
79
80	joy0dat = amiga_custom.joy0dat;
81
82	amimouse_lastx = joy0dat & 0xff;
83	amimouse_lasty = joy0dat >> 8;
84
85	error = request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse",
86			    dev);
87	if (error)
88		dev_err(&dev->dev, "Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
89
90	return error;
91}
92
93static void amimouse_close(struct input_dev *dev)
94{
95	free_irq(IRQ_AMIGA_VERTB, dev);
96}
97
98static int __init amimouse_probe(struct platform_device *pdev)
99{
100	int err;
101	struct input_dev *dev;
102
103	dev = input_allocate_device();
104	if (!dev)
105		return -ENOMEM;
106
107	dev->name = pdev->name;
108	dev->phys = "amimouse/input0";
109	dev->id.bustype = BUS_AMIGA;
110	dev->id.vendor = 0x0001;
111	dev->id.product = 0x0002;
112	dev->id.version = 0x0100;
113
114	dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
115	dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
116	dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
117		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
118	dev->open = amimouse_open;
119	dev->close = amimouse_close;
120	dev->dev.parent = &pdev->dev;
121
122	err = input_register_device(dev);
123	if (err) {
124		input_free_device(dev);
125		return err;
126	}
127
128	platform_set_drvdata(pdev, dev);
129
130	return 0;
131}
132
133static int __exit amimouse_remove(struct platform_device *pdev)
134{
135	struct input_dev *dev = platform_get_drvdata(pdev);
136
137	platform_set_drvdata(pdev, NULL);
138	input_unregister_device(dev);
139	return 0;
140}
141
142static struct platform_driver amimouse_driver = {
143	.remove = __exit_p(amimouse_remove),
144	.driver   = {
145		.name	= "amiga-mouse",
146		.owner	= THIS_MODULE,
147	},
148};
149
150static int __init amimouse_init(void)
151{
152	return platform_driver_probe(&amimouse_driver, amimouse_probe);
153}
154
155module_init(amimouse_init);
156
157static void __exit amimouse_exit(void)
158{
159	platform_driver_unregister(&amimouse_driver);
160}
161
162module_exit(amimouse_exit);
163
164MODULE_ALIAS("platform:amiga-mouse");
165