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