1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Copyright (c) 1998-2001 Vojtech Pavlik
4 */
5
6/*
7 * Driver for Amiga joysticks for Linux/m68k
8 */
9
10/*
11 */
12
13#include <linux/types.h>
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/input.h>
19#include <linux/interrupt.h>
20#include <linux/mutex.h>
21
22#include <asm/amigahw.h>
23#include <asm/amigaints.h>
24
25MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
26MODULE_DESCRIPTION("Driver for Amiga joysticks");
27MODULE_LICENSE("GPL");
28
29static int amijoy[2] = { 0, 1 };
30module_param_array_named(map, amijoy, uint, NULL, 0);
31MODULE_PARM_DESC(map, "Map of attached joysticks in form of <a>,<b> (default is 0,1)");
32
33static int amijoy_used;
34static DEFINE_MUTEX(amijoy_mutex);
35static struct input_dev *amijoy_dev[2];
36static char *amijoy_phys[2] = { "amijoy/input0", "amijoy/input1" };
37
38static irqreturn_t amijoy_interrupt(int irq, void *dummy)
39{
40	int i, data = 0, button = 0;
41
42	for (i = 0; i < 2; i++)
43		if (amijoy[i]) {
44
45			switch (i) {
46				case 0: data = ~amiga_custom.joy0dat; button = (~ciaa.pra >> 6) & 1; break;
47				case 1: data = ~amiga_custom.joy1dat; button = (~ciaa.pra >> 7) & 1; break;
48			}
49
50			input_report_key(amijoy_dev[i], BTN_TRIGGER, button);
51
52			input_report_abs(amijoy_dev[i], ABS_X, ((data >> 1) & 1) - ((data >> 9) & 1));
53			data = ~(data ^ (data << 1));
54			input_report_abs(amijoy_dev[i], ABS_Y, ((data >> 1) & 1) - ((data >> 9) & 1));
55
56			input_sync(amijoy_dev[i]);
57		}
58	return IRQ_HANDLED;
59}
60
61static int amijoy_open(struct input_dev *dev)
62{
63	int err;
64
65	err = mutex_lock_interruptible(&amijoy_mutex);
66	if (err)
67		return err;
68
69	if (!amijoy_used && request_irq(IRQ_AMIGA_VERTB, amijoy_interrupt, 0, "amijoy", amijoy_interrupt)) {
70		printk(KERN_ERR "amijoy.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
71		err = -EBUSY;
72		goto out;
73	}
74
75	amijoy_used++;
76out:
77	mutex_unlock(&amijoy_mutex);
78	return err;
79}
80
81static void amijoy_close(struct input_dev *dev)
82{
83	mutex_lock(&amijoy_mutex);
84	if (!--amijoy_used)
85		free_irq(IRQ_AMIGA_VERTB, amijoy_interrupt);
86	mutex_unlock(&amijoy_mutex);
87}
88
89static int __init amijoy_init(void)
90{
91	int i, j;
92	int err;
93
94	if (!MACH_IS_AMIGA)
95		return -ENODEV;
96
97	for (i = 0; i < 2; i++) {
98		if (!amijoy[i])
99			continue;
100
101		amijoy_dev[i] = input_allocate_device();
102		if (!amijoy_dev[i]) {
103			err = -ENOMEM;
104			goto fail;
105		}
106
107		if (!request_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2, "amijoy [Denise]")) {
108			input_free_device(amijoy_dev[i]);
109			err = -EBUSY;
110			goto fail;
111		}
112
113		amijoy_dev[i]->name = "Amiga joystick";
114		amijoy_dev[i]->phys = amijoy_phys[i];
115		amijoy_dev[i]->id.bustype = BUS_AMIGA;
116		amijoy_dev[i]->id.vendor = 0x0001;
117		amijoy_dev[i]->id.product = 0x0003;
118		amijoy_dev[i]->id.version = 0x0100;
119
120		amijoy_dev[i]->open = amijoy_open;
121		amijoy_dev[i]->close = amijoy_close;
122
123		amijoy_dev[i]->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
124		amijoy_dev[i]->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
125		amijoy_dev[i]->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
126			BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
127		for (j = 0; j < 2; j++) {
128			input_set_abs_params(amijoy_dev[i], ABS_X + j,
129					     -1, 1, 0, 0);
130		}
131
132		err = input_register_device(amijoy_dev[i]);
133		if (err) {
134			input_free_device(amijoy_dev[i]);
135			goto fail;
136		}
137	}
138	return 0;
139
140 fail:	while (--i >= 0)
141		if (amijoy[i]) {
142			input_unregister_device(amijoy_dev[i]);
143			release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
144		}
145	return err;
146}
147
148static void __exit amijoy_exit(void)
149{
150	int i;
151
152	for (i = 0; i < 2; i++)
153		if (amijoy[i]) {
154			input_unregister_device(amijoy_dev[i]);
155			release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
156		}
157}
158
159module_init(amijoy_init);
160module_exit(amijoy_exit);
161