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