1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Amiga mouse driver for Linux/m68k
4 *
5 * Copyright (c) 2000-2002 Vojtech Pavlik
6 *
7 * Based on the work of:
8 * Michael Rausch James Banks
9 * Matther Dillon David Giller
10 * Nathan Laredo Linus Torvalds
11 * Johan Myreen Jes Sorensen
12 * Russell King
13 */
14
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/input.h>
19#include <linux/interrupt.h>
20#include <linux/platform_device.h>
21
22#include <asm/irq.h>
23#include <asm/setup.h>
24#include <linux/uaccess.h>
25#include <asm/amigahw.h>
26#include <asm/amigaints.h>
27
28MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
29MODULE_DESCRIPTION("Amiga mouse driver");
30MODULE_LICENSE("GPL");
31
32static int amimouse_lastx, amimouse_lasty;
33
34static irqreturn_t amimouse_interrupt(int irq, void *data)
35{
36 struct input_dev *dev = data;
37 unsigned short joy0dat, potgor;
38 int nx, ny, dx, dy;
39
40 joy0dat = amiga_custom.joy0dat;
41
42 nx = joy0dat & 0xff;
43 ny = joy0dat >> 8;
44
45 dx = nx - amimouse_lastx;
46 dy = ny - amimouse_lasty;
47
48 if (dx < -127) dx = (256 + nx) - amimouse_lastx;
49 if (dx > 127) dx = (nx - 256) - amimouse_lastx;
50 if (dy < -127) dy = (256 + ny) - amimouse_lasty;
51 if (dy > 127) dy = (ny - 256) - amimouse_lasty;
52
53 amimouse_lastx = nx;
54 amimouse_lasty = ny;
55
56 potgor = amiga_custom.potgor;
57
58 input_report_rel(dev, REL_X, value: dx);
59 input_report_rel(dev, REL_Y, value: dy);
60
61 input_report_key(dev, BTN_LEFT, value: ciaa.pra & 0x40);
62 input_report_key(dev, BTN_MIDDLE, value: potgor & 0x0100);
63 input_report_key(dev, BTN_RIGHT, value: potgor & 0x0400);
64
65 input_sync(dev);
66
67 return IRQ_HANDLED;
68}
69
70static int amimouse_open(struct input_dev *dev)
71{
72 unsigned short joy0dat;
73 int error;
74
75 joy0dat = amiga_custom.joy0dat;
76
77 amimouse_lastx = joy0dat & 0xff;
78 amimouse_lasty = joy0dat >> 8;
79
80 error = request_irq(irq: IRQ_AMIGA_VERTB, handler: amimouse_interrupt, flags: 0, name: "amimouse",
81 dev);
82 if (error)
83 dev_err(&dev->dev, "Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
84
85 return error;
86}
87
88static void amimouse_close(struct input_dev *dev)
89{
90 free_irq(IRQ_AMIGA_VERTB, dev);
91}
92
93static int __init amimouse_probe(struct platform_device *pdev)
94{
95 int err;
96 struct input_dev *dev;
97
98 dev = input_allocate_device();
99 if (!dev)
100 return -ENOMEM;
101
102 dev->name = pdev->name;
103 dev->phys = "amimouse/input0";
104 dev->id.bustype = BUS_AMIGA;
105 dev->id.vendor = 0x0001;
106 dev->id.product = 0x0002;
107 dev->id.version = 0x0100;
108
109 dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
110 dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
111 dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
112 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
113 dev->open = amimouse_open;
114 dev->close = amimouse_close;
115 dev->dev.parent = &pdev->dev;
116
117 err = input_register_device(dev);
118 if (err) {
119 input_free_device(dev);
120 return err;
121 }
122
123 platform_set_drvdata(pdev, data: dev);
124
125 return 0;
126}
127
128static void __exit amimouse_remove(struct platform_device *pdev)
129{
130 struct input_dev *dev = platform_get_drvdata(pdev);
131
132 input_unregister_device(dev);
133}
134
135/*
136 * amimouse_remove() lives in .exit.text. For drivers registered via
137 * module_platform_driver_probe() this is ok because they cannot get unbound at
138 * runtime. So mark the driver struct with __refdata to prevent modpost
139 * triggering a section mismatch warning.
140 */
141static struct platform_driver amimouse_driver __refdata = {
142 .remove = __exit_p(amimouse_remove),
143 .driver = {
144 .name = "amiga-mouse",
145 },
146};
147
148module_platform_driver_probe(amimouse_driver, amimouse_probe);
149
150MODULE_ALIAS("platform:amiga-mouse");
151

source code of linux/drivers/input/mouse/amimouse.c