amimouse.c revision 7d12e780e003f93433d49ce78cfedf4b4c52adc5 
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
25#include <asm/irq.h>
26#include <asm/setup.h>
27#include <asm/system.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;
37static struct input_dev *amimouse_dev;
38
39static irqreturn_t amimouse_interrupt(int irq, void *dummy)
40{
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(amimouse_dev, REL_X, dx);
63	input_report_rel(amimouse_dev, REL_Y, dy);
64
65	input_report_key(amimouse_dev, BTN_LEFT,   ciaa.pra & 0x40);
66	input_report_key(amimouse_dev, BTN_MIDDLE, potgor & 0x0100);
67	input_report_key(amimouse_dev, BTN_RIGHT,  potgor & 0x0400);
68
69	input_sync(amimouse_dev);
70
71	return IRQ_HANDLED;
72}
73
74static int amimouse_open(struct input_dev *dev)
75{
76	unsigned short joy0dat;
77
78	joy0dat = amiga_custom.joy0dat;
79
80	amimouse_lastx = joy0dat & 0xff;
81	amimouse_lasty = joy0dat >> 8;
82
83	if (request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse", amimouse_interrupt)) {
84                printk(KERN_ERR "amimouse.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
85                return -EBUSY;
86        }
87
88        return 0;
89}
90
91static void amimouse_close(struct input_dev *dev)
92{
93	free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt);
94}
95
96static int __init amimouse_init(void)
97{
98	if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
99		return -ENODEV;
100
101	if (!(amimouse_dev = input_allocate_device()))
102		return -ENOMEM;
103
104	amimouse_dev->name = "Amiga mouse";
105	amimouse_dev->phys = "amimouse/input0";
106	amimouse_dev->id.bustype = BUS_AMIGA;
107	amimouse_dev->id.vendor = 0x0001;
108	amimouse_dev->id.product = 0x0002;
109	amimouse_dev->id.version = 0x0100;
110
111	amimouse_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
112	amimouse_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
113	amimouse_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
114	amimouse_dev->open = amimouse_open;
115	amimouse_dev->close = amimouse_close;
116
117	input_register_device(amimouse_dev);
118
119	return 0;
120}
121
122static void __exit amimouse_exit(void)
123{
124        input_unregister_device(amimouse_dev);
125}
126
127module_init(amimouse_init);
128module_exit(amimouse_exit);
129