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 
25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
26 MODULE_DESCRIPTION("Driver for Amiga joysticks");
27 MODULE_LICENSE("GPL");
28 
29 static int amijoy[2] = { 0, 1 };
30 module_param_array_named(map, amijoy, uint, NULL, 0);
31 MODULE_PARM_DESC(map, "Map of attached joysticks in form of <a>,<b> (default is 0,1)");
32 
33 static int amijoy_used;
34 static DEFINE_MUTEX(amijoy_mutex);
35 static struct input_dev *amijoy_dev[2];
36 static char *amijoy_phys[2] = { "amijoy/input0", "amijoy/input1" };
37 
amijoy_interrupt(int irq,void * dummy)38 static 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 
amijoy_open(struct input_dev * dev)61 static 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++;
76 out:
77 	mutex_unlock(&amijoy_mutex);
78 	return err;
79 }
80 
amijoy_close(struct input_dev * dev)81 static 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 
amijoy_init(void)89 static 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 
amijoy_exit(void)148 static 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 
159 module_init(amijoy_init);
160 module_exit(amijoy_exit);
161