xref: /linux/drivers/input/joystick/amijoy.c (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
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 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/input.h>
16 #include <linux/interrupt.h>
17 #include <linux/mutex.h>
18 
19 #include <asm/amigahw.h>
20 #include <asm/amigaints.h>
21 
22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
23 MODULE_DESCRIPTION("Driver for Amiga joysticks");
24 MODULE_LICENSE("GPL");
25 
26 static int amijoy[2] = { 0, 1 };
27 module_param_array_named(map, amijoy, uint, NULL, 0);
28 MODULE_PARM_DESC(map, "Map of attached joysticks in form of <a>,<b> (default is 0,1)");
29 
30 static int amijoy_used;
31 static DEFINE_MUTEX(amijoy_mutex);
32 static struct input_dev *amijoy_dev[2];
33 static char *amijoy_phys[2] = { "amijoy/input0", "amijoy/input1" };
34 
amijoy_interrupt(int irq,void * dummy)35 static irqreturn_t amijoy_interrupt(int irq, void *dummy)
36 {
37 	int i, data = 0, button = 0;
38 
39 	for (i = 0; i < 2; i++)
40 		if (amijoy[i]) {
41 
42 			switch (i) {
43 				case 0: data = ~amiga_custom.joy0dat; button = (~ciaa.pra >> 6) & 1; break;
44 				case 1: data = ~amiga_custom.joy1dat; button = (~ciaa.pra >> 7) & 1; break;
45 			}
46 
47 			input_report_key(amijoy_dev[i], BTN_TRIGGER, button);
48 
49 			input_report_abs(amijoy_dev[i], ABS_X, ((data >> 1) & 1) - ((data >> 9) & 1));
50 			data = ~(data ^ (data << 1));
51 			input_report_abs(amijoy_dev[i], ABS_Y, ((data >> 1) & 1) - ((data >> 9) & 1));
52 
53 			input_sync(amijoy_dev[i]);
54 		}
55 	return IRQ_HANDLED;
56 }
57 
amijoy_open(struct input_dev * dev)58 static int amijoy_open(struct input_dev *dev)
59 {
60 	int err;
61 
62 	err = mutex_lock_interruptible(&amijoy_mutex);
63 	if (err)
64 		return err;
65 
66 	if (!amijoy_used && request_irq(IRQ_AMIGA_VERTB, amijoy_interrupt, 0, "amijoy", amijoy_interrupt)) {
67 		printk(KERN_ERR "amijoy.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
68 		err = -EBUSY;
69 		goto out;
70 	}
71 
72 	amijoy_used++;
73 out:
74 	mutex_unlock(&amijoy_mutex);
75 	return err;
76 }
77 
amijoy_close(struct input_dev * dev)78 static void amijoy_close(struct input_dev *dev)
79 {
80 	mutex_lock(&amijoy_mutex);
81 	if (!--amijoy_used)
82 		free_irq(IRQ_AMIGA_VERTB, amijoy_interrupt);
83 	mutex_unlock(&amijoy_mutex);
84 }
85 
amijoy_init(void)86 static int __init amijoy_init(void)
87 {
88 	int i, j;
89 	int err;
90 
91 	if (!MACH_IS_AMIGA)
92 		return -ENODEV;
93 
94 	for (i = 0; i < 2; i++) {
95 		if (!amijoy[i])
96 			continue;
97 
98 		amijoy_dev[i] = input_allocate_device();
99 		if (!amijoy_dev[i]) {
100 			err = -ENOMEM;
101 			goto fail;
102 		}
103 
104 		if (!request_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2, "amijoy [Denise]")) {
105 			input_free_device(amijoy_dev[i]);
106 			err = -EBUSY;
107 			goto fail;
108 		}
109 
110 		amijoy_dev[i]->name = "Amiga joystick";
111 		amijoy_dev[i]->phys = amijoy_phys[i];
112 		amijoy_dev[i]->id.bustype = BUS_AMIGA;
113 		amijoy_dev[i]->id.vendor = 0x0001;
114 		amijoy_dev[i]->id.product = 0x0003;
115 		amijoy_dev[i]->id.version = 0x0100;
116 
117 		amijoy_dev[i]->open = amijoy_open;
118 		amijoy_dev[i]->close = amijoy_close;
119 
120 		amijoy_dev[i]->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
121 		amijoy_dev[i]->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
122 		amijoy_dev[i]->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
123 			BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
124 		for (j = 0; j < 2; j++) {
125 			input_set_abs_params(amijoy_dev[i], ABS_X + j,
126 					     -1, 1, 0, 0);
127 		}
128 
129 		err = input_register_device(amijoy_dev[i]);
130 		if (err) {
131 			input_free_device(amijoy_dev[i]);
132 			goto fail;
133 		}
134 	}
135 	return 0;
136 
137  fail:	while (--i >= 0)
138 		if (amijoy[i]) {
139 			input_unregister_device(amijoy_dev[i]);
140 			release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
141 		}
142 	return err;
143 }
144 
amijoy_exit(void)145 static void __exit amijoy_exit(void)
146 {
147 	int i;
148 
149 	for (i = 0; i < 2; i++)
150 		if (amijoy[i]) {
151 			input_unregister_device(amijoy_dev[i]);
152 			release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
153 		}
154 }
155 
156 module_init(amijoy_init);
157 module_exit(amijoy_exit);
158