1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
/*
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
/*
* Creative Labs Blaster GamePad Cobra driver for Linux
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/input.h>
#include <linux/jiffies.h>
#define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
#define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
#define COBRA_LENGTH 36
static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 };
struct cobra {
struct gameport *gameport;
struct input_dev *dev[2];
int reads;
int bads;
unsigned char exists;
char phys[2][32];
};
static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
{
unsigned long flags;
unsigned char u, v, w;
__u64 buf[2];
int r[2], t[2];
int i, j, ret;
int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
for (i = 0; i < 2; i++) {
r[i] = buf[i] = 0;
t[i] = COBRA_MAX_STROBE;
}
local_irq_save(flags);
u = gameport_read(gameport);
do {
t[0]--; t[1]--;
v = gameport_read(gameport);
for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
if (w & 0x30) {
if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
t[i] = strobe;
u = v;
} else t[i] = 0;
}
} while (t[0] > 0 || t[1] > 0);
local_irq_restore(flags);
ret = 0;
for (i = 0; i < 2; i++) {
if (r[i] != COBRA_LENGTH) continue;
for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
if (j < COBRA_LENGTH) ret |= (1 << i);
data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
| ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
| ((buf[i] >> 11) & 0x1f00000);
}
return ret;
}
static void cobra_poll(struct gameport *gameport)
{
struct cobra *cobra = gameport_get_drvdata(gameport);
struct input_dev *dev;
unsigned int data[2];
int i, j, r;
cobra->reads++;
if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
cobra->bads++;
return;
}
for (i = 0; i < 2; i++)
if (cobra->exists & r & (1 << i)) {
dev = cobra->dev[i];
input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
for (j = 0; cobra_btn[j]; j++)
input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
input_sync(dev);
}
}
static int cobra_open(struct input_dev *dev)
{
struct cobra *cobra = input_get_drvdata(dev);
gameport_start_polling(cobra->gameport);
return 0;
}
static void cobra_close(struct input_dev *dev)
{
struct cobra *cobra = input_get_drvdata(dev);
gameport_stop_polling(cobra->gameport);
}
static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
{
struct cobra *cobra;
struct input_dev *input_dev;
unsigned int data[2];
int i, j;
int err;
cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
if (!cobra)
return -ENOMEM;
cobra->gameport = gameport;
gameport_set_drvdata(gameport, cobra);
err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
if (err)
goto fail1;
cobra->exists = cobra_read_packet(gameport, data);
for (i = 0; i < 2; i++)
if ((cobra->exists >> i) & data[i] & 1) {
printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
" Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
cobra->exists &= ~(1 << i);
}
if (!cobra->exists) {
err = -ENODEV;
goto fail2;
}
gameport_set_poll_handler(gameport, cobra_poll);
gameport_set_poll_interval(gameport, 20);
for (i = 0; i < 2; i++) {
if (~(cobra->exists >> i) & 1)
continue;
cobra->dev[i] = input_dev = input_allocate_device();
if (!input_dev) {
err = -ENOMEM;
goto fail3;
}
snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
"%s/input%d", gameport->phys, i);
input_dev->name = "Creative Labs Blaster GamePad Cobra";
input_dev->phys = cobra->phys[i];
input_dev->id.bustype = BUS_GAMEPORT;
input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
input_dev->id.product = 0x0008;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &gameport->dev;
input_set_drvdata(input_dev, cobra);
input_dev->open = cobra_open;
input_dev->close = cobra_close;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
for (j = 0; cobra_btn[j]; j++)
set_bit(cobra_btn[j], input_dev->keybit);
err = input_register_device(cobra->dev[i]);
if (err)
goto fail4;
}
return 0;
fail4: input_free_device(cobra->dev[i]);
fail3: while (--i >= 0)
if (cobra->dev[i])
input_unregister_device(cobra->dev[i]);
fail2: gameport_close(gameport);
fail1: gameport_set_drvdata(gameport, NULL);
kfree(cobra);
return err;
}
static void cobra_disconnect(struct gameport *gameport)
{
struct cobra *cobra = gameport_get_drvdata(gameport);
int i;
for (i = 0; i < 2; i++)
if ((cobra->exists >> i) & 1)
input_unregister_device(cobra->dev[i]);
gameport_close(gameport);
gameport_set_drvdata(gameport, NULL);
kfree(cobra);
}
static struct gameport_driver cobra_drv = {
.driver = {
.name = "cobra",
},
.description = DRIVER_DESC,
.connect = cobra_connect,
.disconnect = cobra_disconnect,
};
module_gameport_driver(cobra_drv);
|
