xref: /linux/drivers/input/joystick/joydump.c (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
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 #include <linux/module.h>
12 #include <linux/gameport.h>
13 #include <linux/kernel.h>
14 #include <linux/delay.h>
15 #include <linux/slab.h>
16 
17 #define DRIVER_DESC	"Gameport data dumper module"
18 
19 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
20 MODULE_DESCRIPTION(DRIVER_DESC);
21 MODULE_LICENSE("GPL");
22 
23 #define BUF_SIZE 256
24 
25 struct joydump {
26 	unsigned int time;
27 	unsigned char data;
28 };
29 
joydump_connect(struct gameport * gameport,struct gameport_driver * drv)30 static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
31 {
32 	struct joydump *buf;	/* all entries */
33 	struct joydump *dump, *prev;	/* one entry each */
34 	int axes[4], buttons;
35 	int i, j, t, timeout;
36 	unsigned long flags;
37 	unsigned char u;
38 
39 	printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
40 	printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
41 	printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);
42 
43 	if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
44 
45 		printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");
46 
47 		if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
48 
49 			printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
50 			printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
51 			return -ENODEV;
52 		}
53 
54 		gameport_cooked_read(gameport, axes, &buttons);
55 
56 		for (i = 0; i < 4; i++)
57 			printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
58 		printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
59 		printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
60 	}
61 
62 	timeout = gameport_time(gameport, 10000); /* 10 ms */
63 
64 	buf = kmalloc_array(BUF_SIZE, sizeof(struct joydump), GFP_KERNEL);
65 	if (!buf) {
66 		printk(KERN_INFO "joydump: no memory for testing\n");
67 		goto jd_end;
68 	}
69 	dump = buf;
70 	t = 0;
71 	i = 1;
72 
73 	local_irq_save(flags);
74 
75 	u = gameport_read(gameport);
76 
77 	dump->data = u;
78 	dump->time = t;
79 	dump++;
80 
81 	gameport_trigger(gameport);
82 
83 	while (i < BUF_SIZE && t < timeout) {
84 
85 		dump->data = gameport_read(gameport);
86 
87 		if (dump->data ^ u) {
88 			u = dump->data;
89 			dump->time = t;
90 			i++;
91 			dump++;
92 		}
93 		t++;
94 	}
95 
96 	local_irq_restore(flags);
97 
98 /*
99  * Dump data.
100  */
101 
102 	t = i;
103 	dump = buf;
104 	prev = dump;
105 
106 	printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
107 	printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
108 	for (j = 7; j >= 0; j--)
109 		printk("%d", (dump->data >> j) & 1);
110 	printk(" |\n");
111 	dump++;
112 
113 	for (i = 1; i < t; i++, dump++, prev++) {
114 		printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
115 			i, dump->time - prev->time);
116 		for (j = 7; j >= 0; j--)
117 			printk("%d", (dump->data >> j) & 1);
118 		printk(" |\n");
119 	}
120 	kfree(buf);
121 
122 jd_end:
123 	printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
124 
125 	return 0;
126 }
127 
joydump_disconnect(struct gameport * gameport)128 static void joydump_disconnect(struct gameport *gameport)
129 {
130 	gameport_close(gameport);
131 }
132 
133 static struct gameport_driver joydump_drv = {
134 	.driver		= {
135 		.name	= "joydump",
136 	},
137 	.description	= DRIVER_DESC,
138 	.connect	= joydump_connect,
139 	.disconnect	= joydump_disconnect,
140 };
141 
142 module_gameport_driver(joydump_drv);
143