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
32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
33 MODULE_DESCRIPTION("Amiga mouse driver");
34 MODULE_LICENSE("GPL");
35
36 static int amimouse_lastx, amimouse_lasty;
37 static struct input_dev *amimouse_dev;
38
39 static 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
74 static 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
91 static void amimouse_close(struct input_dev *dev)
92 {
93 free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt);
94 }
95
96 static int __init amimouse_init(void)
97 {
98 int err;
99
100 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
101 return -ENODEV;
102
103 amimouse_dev = input_allocate_device();
104 if (!amimouse_dev)
105 return -ENOMEM;
106
107 amimouse_dev->name = "Amiga mouse";
108 amimouse_dev->phys = "amimouse/input0";
109 amimouse_dev->id.bustype = BUS_AMIGA;
110 amimouse_dev->id.vendor = 0x0001;
111 amimouse_dev->id.product = 0x0002;
112 amimouse_dev->id.version = 0x0100;
113
114 amimouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
115 amimouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
116 amimouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
117 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
118 amimouse_dev->open = amimouse_open;
119 amimouse_dev->close = amimouse_close;
120
121 err = input_register_device(amimouse_dev);
122 if (err) {
123 input_free_device(amimouse_dev);
124 return err;
125 }
126
127 return 0;
128 }
129
130 static void __exit amimouse_exit(void)
131 {
132 input_unregister_device(amimouse_dev);
133 }
134
135 module_init(amimouse_init);
136 module_exit(amimouse_exit);
137
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