1 /*
2 * $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech Exp $
3 *
4 * Copyright (c) 1999-2001 Vojtech Pavlik
5 */
6
7 /*
8 * Creative Labs Blaster GamePad Cobra driver for Linux
9 */
10
11 /*
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * Should you need to contact me, the author, you can do so either by
27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
29 */
30
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/slab.h>
34 #include <linux/init.h>
35 #include <linux/gameport.h>
36 #include <linux/input.h>
37
38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
39 MODULE_DESCRIPTION("Creative Labs Blaster GamePad Cobra driver");
40 MODULE_LICENSE("GPL");
41
42 #define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
43 #define COBRA_REFRESH_TIME HZ/50 /* 20 ms between reads */
44 #define COBRA_LENGTH 36
45
46 static char* cobra_name = "Creative Labs Blaster GamePad Cobra";
47
48 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 };
49
50 struct cobra {
51 struct gameport *gameport;
52 struct timer_list timer;
53 struct input_dev dev[2];
54 int used;
55 int reads;
56 int bads;
57 unsigned char exists;
58 char phys[2][32];
59 };
60
61 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
62 {
63 unsigned long flags;
64 unsigned char u, v, w;
65 __u64 buf[2];
66 int r[2], t[2];
67 int i, j, ret;
68
69 int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
70
71 for (i = 0; i < 2; i++) {
72 r[i] = buf[i] = 0;
73 t[i] = COBRA_MAX_STROBE;
74 }
75
76 local_irq_save(flags);
77
78 u = gameport_read(gameport);
79
80 do {
81 t[0]--; t[1]--;
82 v = gameport_read(gameport);
83 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
84 if (w & 0x30) {
85 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
86 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
87 t[i] = strobe;
88 u = v;
89 } else t[i] = 0;
90 }
91 } while (t[0] > 0 || t[1] > 0);
92
93 local_irq_restore(flags);
94
95 ret = 0;
96
97 for (i = 0; i < 2; i++) {
98
99 if (r[i] != COBRA_LENGTH) continue;
100
101 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
102 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
103
104 if (j < COBRA_LENGTH) ret |= (1 << i);
105
106 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
107 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
108 | ((buf[i] >> 11) & 0x1f00000);
109
110 }
111
112 return ret;
113 }
114
115 static void cobra_timer(unsigned long private)
116 {
117 struct cobra *cobra = (void *) private;
118 struct input_dev *dev;
119 unsigned int data[2];
120 int i, j, r;
121
122 cobra->reads++;
123
124 if ((r = cobra_read_packet(cobra->gameport, data)) != cobra->exists)
125 cobra->bads++;
126 else
127
128 for (i = 0; i < 2; i++)
129 if (cobra->exists & r & (1 << i)) {
130
131 dev = cobra->dev + i;
132
133 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
134 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
135
136 for (j = 0; cobra_btn[j]; j++)
137 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
138
139 input_sync(dev);
140
141 }
142
143 mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
144 }
145
146 static int cobra_open(struct input_dev *dev)
147 {
148 struct cobra *cobra = dev->private;
149 if (!cobra->used++)
150 mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
151 return 0;
152 }
153
154 static void cobra_close(struct input_dev *dev)
155 {
156 struct cobra *cobra = dev->private;
157 if (!--cobra->used)
158 del_timer(&cobra->timer);
159 }
160
161 static void cobra_connect(struct gameport *gameport, struct gameport_dev *dev)
162 {
163 struct cobra *cobra;
164 unsigned int data[2];
165 int i, j;
166
167 if (!(cobra = kmalloc(sizeof(struct cobra), GFP_KERNEL)))
168 return;
169 memset(cobra, 0, sizeof(struct cobra));
170
171 gameport->private = cobra;
172
173 cobra->gameport = gameport;
174 init_timer(&cobra->timer);
175 cobra->timer.data = (long) cobra;
176 cobra->timer.function = cobra_timer;
177
178 if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
179 goto fail1;
180
181 cobra->exists = cobra_read_packet(gameport, data);
182
183 for (i = 0; i < 2; i++)
184 if ((cobra->exists >> i) & data[i] & 1) {
185 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
186 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
187 cobra->exists &= ~(1 << i);
188 }
189
190 if (!cobra->exists)
191 goto fail2;
192
193 for (i = 0; i < 2; i++)
194 if ((cobra->exists >> i) & 1) {
195
196 sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i);
197
198 cobra->dev[i].private = cobra;
199 cobra->dev[i].open = cobra_open;
200 cobra->dev[i].close = cobra_close;
201
202 cobra->dev[i].name = cobra_name;
203 cobra->dev[i].phys = cobra->phys[i];
204 cobra->dev[i].id.bustype = BUS_GAMEPORT;
205 cobra->dev[i].id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
206 cobra->dev[i].id.product = 0x0008;
207 cobra->dev[i].id.version = 0x0100;
208
209 cobra->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
210 cobra->dev[i].absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
211
212 for (j = 0; cobra_btn[j]; j++)
213 set_bit(cobra_btn[j], cobra->dev[i].keybit);
214
215 cobra->dev[i].absmin[ABS_X] = -1; cobra->dev[i].absmax[ABS_X] = 1;
216 cobra->dev[i].absmin[ABS_Y] = -1; cobra->dev[i].absmax[ABS_Y] = 1;
217
218 input_register_device(cobra->dev + i);
219 printk(KERN_INFO "input: %s on %s\n", cobra_name, gameport->phys);
220 }
221
222 return;
223 fail2: gameport_close(gameport);
224 fail1: kfree(cobra);
225 }
226
227 static void cobra_disconnect(struct gameport *gameport)
228 {
229 int i;
230
231 struct cobra *cobra = gameport->private;
232 for (i = 0; i < 2; i++)
233 if ((cobra->exists >> i) & 1)
234 input_unregister_device(cobra->dev + i);
235 gameport_close(gameport);
236 kfree(cobra);
237 }
238
239 static struct gameport_dev cobra_dev = {
240 .connect = cobra_connect,
241 .disconnect = cobra_disconnect,
242 };
243
244 int __init cobra_init(void)
245 {
246 gameport_register_device(&cobra_dev);
247 return 0;
248 }
249
250 void __exit cobra_exit(void)
251 {
252 gameport_unregister_device(&cobra_dev);
253 }
254
255 module_init(cobra_init);
256 module_exit(cobra_exit);
257
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