1/*
2 * Copyright (c) 1999-2001 Vojtech Pavlik
3 */
4
5/*
6 * Creative Labs Blaster GamePad Cobra driver for Linux
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/gameport.h>
29#include <linux/input.h>
30#include <linux/jiffies.h>
31
32#define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver"
33
34MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
35MODULE_DESCRIPTION(DRIVER_DESC);
36MODULE_LICENSE("GPL");
37
38#define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
39#define COBRA_LENGTH 36
40
41static 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 };
42
43struct cobra {
44 struct gameport *gameport;
45 struct input_dev *dev[2];
46 int reads;
47 int bads;
48 unsigned char exists;
49 char phys[2][32];
50};
51
52static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
53{
54 unsigned long flags;
55 unsigned char u, v, w;
56 __u64 buf[2];
57 int r[2], t[2];
58 int i, j, ret;
59
60 int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
61
62 for (i = 0; i < 2; i++) {
63 r[i] = buf[i] = 0;
64 t[i] = COBRA_MAX_STROBE;
65 }
66
67 local_irq_save(flags);
68
69 u = gameport_read(gameport);
70
71 do {
72 t[0]--; t[1]--;
73 v = gameport_read(gameport);
74 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
75 if (w & 0x30) {
76 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
77 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
78 t[i] = strobe;
79 u = v;
80 } else t[i] = 0;
81 }
82 } while (t[0] > 0 || t[1] > 0);
83
84 local_irq_restore(flags);
85
86 ret = 0;
87
88 for (i = 0; i < 2; i++) {
89
90 if (r[i] != COBRA_LENGTH) continue;
91
92 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
93 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
94
95 if (j < COBRA_LENGTH) ret |= (1 << i);
96
97 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
98 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
99 | ((buf[i] >> 11) & 0x1f00000);
100
101 }
102
103 return ret;
104}
105
106static void cobra_poll(struct gameport *gameport)
107{
108 struct cobra *cobra = gameport_get_drvdata(gameport);
109 struct input_dev *dev;
110 unsigned int data[2];
111 int i, j, r;
112
113 cobra->reads++;
114
115 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
116 cobra->bads++;
117 return;
118 }
119
120 for (i = 0; i < 2; i++)
121 if (cobra->exists & r & (1 << i)) {
122
123 dev = cobra->dev[i];
124
125 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
126 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
127
128 for (j = 0; cobra_btn[j]; j++)
129 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
130
131 input_sync(dev);
132
133 }
134}
135
136static int cobra_open(struct input_dev *dev)
137{
138 struct cobra *cobra = input_get_drvdata(dev);
139
140 gameport_start_polling(cobra->gameport);
141 return 0;
142}
143
144static void cobra_close(struct input_dev *dev)
145{
146 struct cobra *cobra = input_get_drvdata(dev);
147
148 gameport_stop_polling(cobra->gameport);
149}
150
151static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
152{
153 struct cobra *cobra;
154 struct input_dev *input_dev;
155 unsigned int data[2];
156 int i, j;
157 int err;
158
159 cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
160 if (!cobra)
161 return -ENOMEM;
162
163 cobra->gameport = gameport;
164
165 gameport_set_drvdata(gameport, cobra);
166
167 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
168 if (err)
169 goto fail1;
170
171 cobra->exists = cobra_read_packet(gameport, data);
172
173 for (i = 0; i < 2; i++)
174 if ((cobra->exists >> i) & data[i] & 1) {
175 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
176 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
177 cobra->exists &= ~(1 << i);
178 }
179
180 if (!cobra->exists) {
181 err = -ENODEV;
182 goto fail2;
183 }
184
185 gameport_set_poll_handler(gameport, cobra_poll);
186 gameport_set_poll_interval(gameport, 20);
187
188 for (i = 0; i < 2; i++) {
189 if (~(cobra->exists >> i) & 1)
190 continue;
191
192 cobra->dev[i] = input_dev = input_allocate_device();
193 if (!input_dev) {
194 err = -ENOMEM;
195 goto fail3;
196 }
197
198 snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
199 "%s/input%d", gameport->phys, i);
200
201 input_dev->name = "Creative Labs Blaster GamePad Cobra";
202 input_dev->phys = cobra->phys[i];
203 input_dev->id.bustype = BUS_GAMEPORT;
204 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
205 input_dev->id.product = 0x0008;
206 input_dev->id.version = 0x0100;
207 input_dev->dev.parent = &gameport->dev;
208
209 input_set_drvdata(input_dev, cobra);
210
211 input_dev->open = cobra_open;
212 input_dev->close = cobra_close;
213
214 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
215 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
216 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
217 for (j = 0; cobra_btn[j]; j++)
218 set_bit(cobra_btn[j], input_dev->keybit);
219
220 err = input_register_device(cobra->dev[i]);
221 if (err)
222 goto fail4;
223 }
224
225 return 0;
226
227 fail4: input_free_device(cobra->dev[i]);
228 fail3: while (--i >= 0)
229 if (cobra->dev[i])
230 input_unregister_device(cobra->dev[i]);
231 fail2: gameport_close(gameport);
232 fail1: gameport_set_drvdata(gameport, NULL);
233 kfree(cobra);
234 return err;
235}
236
237static void cobra_disconnect(struct gameport *gameport)
238{
239 struct cobra *cobra = gameport_get_drvdata(gameport);
240 int i;
241
242 for (i = 0; i < 2; i++)
243 if ((cobra->exists >> i) & 1)
244 input_unregister_device(cobra->dev[i]);
245 gameport_close(gameport);
246 gameport_set_drvdata(gameport, NULL);
247 kfree(cobra);
248}
249
250static struct gameport_driver cobra_drv = {
251 .driver = {
252 .name = "cobra",
253 },
254 .description = DRIVER_DESC,
255 .connect = cobra_connect,
256 .disconnect = cobra_disconnect,
257};
258
259module_gameport_driver(cobra_drv);
260