1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Copyright (c) 1996-2001 Vojtech Pavlik
4 */
5
6/*
7 * This is just a very simple driver that can dump the data
8 * out of the joystick port into the syslog ...
9 */
10
11/*
12 */
13
14#include <linux/module.h>
15#include <linux/gameport.h>
16#include <linux/kernel.h>
17#include <linux/delay.h>
18#include <linux/slab.h>
19
20#define DRIVER_DESC	"Gameport data dumper module"
21
22MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
23MODULE_DESCRIPTION(DRIVER_DESC);
24MODULE_LICENSE("GPL");
25
26#define BUF_SIZE 256
27
28struct joydump {
29	unsigned int time;
30	unsigned char data;
31};
32
33static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
34{
35	struct joydump *buf;	/* all entries */
36	struct joydump *dump, *prev;	/* one entry each */
37	int axes[4], buttons;
38	int i, j, t, timeout;
39	unsigned long flags;
40	unsigned char u;
41
42	printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
43	printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
44	printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);
45
46	if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
47
48		printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");
49
50		if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
51
52			printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
53			printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
54			return -ENODEV;
55		}
56
57		gameport_cooked_read(gameport, axes, &buttons);
58
59		for (i = 0; i < 4; i++)
60			printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
61		printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
62		printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
63	}
64
65	timeout = gameport_time(gameport, 10000); /* 10 ms */
66
67	buf = kmalloc_array(BUF_SIZE, sizeof(struct joydump), GFP_KERNEL);
68	if (!buf) {
69		printk(KERN_INFO "joydump: no memory for testing\n");
70		goto jd_end;
71	}
72	dump = buf;
73	t = 0;
74	i = 1;
75
76	local_irq_save(flags);
77
78	u = gameport_read(gameport);
79
80	dump->data = u;
81	dump->time = t;
82	dump++;
83
84	gameport_trigger(gameport);
85
86	while (i < BUF_SIZE && t < timeout) {
87
88		dump->data = gameport_read(gameport);
89
90		if (dump->data ^ u) {
91			u = dump->data;
92			dump->time = t;
93			i++;
94			dump++;
95		}
96		t++;
97	}
98
99	local_irq_restore(flags);
100
101/*
102 * Dump data.
103 */
104
105	t = i;
106	dump = buf;
107	prev = dump;
108
109	printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
110	printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
111	for (j = 7; j >= 0; j--)
112		printk("%d", (dump->data >> j) & 1);
113	printk(" |\n");
114	dump++;
115
116	for (i = 1; i < t; i++, dump++, prev++) {
117		printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
118			i, dump->time - prev->time);
119		for (j = 7; j >= 0; j--)
120			printk("%d", (dump->data >> j) & 1);
121		printk(" |\n");
122	}
123	kfree(buf);
124
125jd_end:
126	printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
127
128	return 0;
129}
130
131static void joydump_disconnect(struct gameport *gameport)
132{
133	gameport_close(gameport);
134}
135
136static struct gameport_driver joydump_drv = {
137	.driver		= {
138		.name	= "joydump",
139	},
140	.description	= DRIVER_DESC,
141	.connect	= joydump_connect,
142	.disconnect	= joydump_disconnect,
143};
144
145module_gameport_driver(joydump_drv);
146