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
22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
23 MODULE_DESCRIPTION(DRIVER_DESC);
24 MODULE_LICENSE("GPL");
25
26 #define BUF_SIZE 256
27
28 struct joydump {
29 unsigned int time;
30 unsigned char data;
31 };
32
joydump_connect(struct gameport * gameport,struct gameport_driver * drv)33 static 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
125 jd_end:
126 printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
127
128 return 0;
129 }
130
joydump_disconnect(struct gameport * gameport)131 static void joydump_disconnect(struct gameport *gameport)
132 {
133 gameport_close(gameport);
134 }
135
136 static 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
145 module_gameport_driver(joydump_drv);
146