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
28 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
29 MODULE_DESCRIPTION("Amiga mouse driver");
30 MODULE_LICENSE("GPL");
31
32 static int amimouse_lastx, amimouse_lasty;
33
amimouse_interrupt(int irq,void * data)34 static 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, dx);
59 input_report_rel(dev, REL_Y, dy);
60
61 input_report_key(dev, BTN_LEFT, ciaa.pra & 0x40);
62 input_report_key(dev, BTN_MIDDLE, potgor & 0x0100);
63 input_report_key(dev, BTN_RIGHT, potgor & 0x0400);
64
65 input_sync(dev);
66
67 return IRQ_HANDLED;
68 }
69
amimouse_open(struct input_dev * dev)70 static 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_AMIGA_VERTB, amimouse_interrupt, 0, "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
amimouse_close(struct input_dev * dev)88 static void amimouse_close(struct input_dev *dev)
89 {
90 free_irq(IRQ_AMIGA_VERTB, dev);
91 }
92
amimouse_probe(struct platform_device * pdev)93 static 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, dev);
124
125 return 0;
126 }
127
amimouse_remove(struct platform_device * pdev)128 static int __exit amimouse_remove(struct platform_device *pdev)
129 {
130 struct input_dev *dev = platform_get_drvdata(pdev);
131
132 input_unregister_device(dev);
133 return 0;
134 }
135
136 static struct platform_driver amimouse_driver = {
137 .remove = __exit_p(amimouse_remove),
138 .driver = {
139 .name = "amiga-mouse",
140 },
141 };
142
143 module_platform_driver_probe(amimouse_driver, amimouse_probe);
144
145 MODULE_ALIAS("platform:amiga-mouse");
146