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_used = 0;
37 static int amimouse_lastx, amimouse_lasty;
38 static struct input_dev amimouse_dev;
39
40 static char *amimouse_name = "Amiga mouse";
41 static char *amimouse_phys = "amimouse/input0";
42
43 static irqreturn_t amimouse_interrupt(int irq, void *dummy, struct pt_regs *fp)
44 {
45 unsigned short joy0dat, potgor;
46 int nx, ny, dx, dy;
47
48 joy0dat = custom.joy0dat;
49
50 nx = joy0dat & 0xff;
51 ny = joy0dat >> 8;
52
53 dx = nx - amimouse_lastx;
54 dy = ny - amimouse_lasty;
55
56 if (dx < -127) dx = (256 + nx) - amimouse_lastx;
57 if (dx > 127) dx = (nx - 256) - amimouse_lastx;
58 if (dy < -127) dy = (256 + ny) - amimouse_lasty;
59 if (dy > 127) dy = (ny - 256) - amimouse_lasty;
60
61 amimouse_lastx = nx;
62 amimouse_lasty = ny;
63
64 potgor = custom.potgor;
65
66 input_regs(&amimouse_dev, fp);
67
68 input_report_rel(&amimouse_dev, REL_X, dx);
69 input_report_rel(&amimouse_dev, REL_Y, dy);
70
71 input_report_key(&amimouse_dev, BTN_LEFT, ciaa.pra & 0x40);
72 input_report_key(&amimouse_dev, BTN_MIDDLE, potgor & 0x0100);
73 input_report_key(&amimouse_dev, BTN_RIGHT, potgor & 0x0400);
74
75 input_sync(&amimouse_dev);
76
77 return IRQ_HANDLED;
78 }
79
80 static int amimouse_open(struct input_dev *dev)
81 {
82 unsigned short joy0dat;
83
84 if (amimouse_used++)
85 return 0;
86
87 joy0dat = custom.joy0dat;
88
89 amimouse_lastx = joy0dat & 0xff;
90 amimouse_lasty = joy0dat >> 8;
91
92 if (request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse", amimouse_interrupt)) {
93 amimouse_used--;
94 printk(KERN_ERR "amimouse.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
95 return -EBUSY;
96 }
97
98 return 0;
99 }
100
101 static void amimouse_close(struct input_dev *dev)
102 {
103 if (!--amimouse_used)
104 free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt);
105 }
106
107 static int __init amimouse_init(void)
108 {
109 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
110 return -ENODEV;
111
112 amimouse_dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
113 amimouse_dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
114 amimouse_dev.keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
115 amimouse_dev.open = amimouse_open;
116 amimouse_dev.close = amimouse_close;
117
118 amimouse_dev.name = amimouse_name;
119 amimouse_dev.phys = amimouse_phys;
120 amimouse_dev.id.bustype = BUS_AMIGA;
121 amimouse_dev.id.vendor = 0x0001;
122 amimouse_dev.id.product = 0x0002;
123 amimouse_dev.id.version = 0x0100;
124
125 input_register_device(&amimouse_dev);
126
127 printk(KERN_INFO "input: %s at joy0dat\n", amimouse_name);
128 return 0;
129 }
130
131 static void __exit amimouse_exit(void)
132 {
133 input_unregister_device(&amimouse_dev);
134 }
135
136 module_init(amimouse_init);
137 module_exit(amimouse_exit);
138
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