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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, 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 | ||
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 | ||
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, 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"); |