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 | |
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, 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 | |
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: 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 | |
88 | static void amimouse_close(struct input_dev *dev) |
89 | { |
90 | free_irq(IRQ_AMIGA_VERTB, dev); |
91 | } |
92 | |
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, data: dev); |
124 | |
125 | return 0; |
126 | } |
127 | |
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 | |