2 * $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech Exp $
4 * Copyright (c) 1999-2001 Vojtech Pavlik
8 * Creative Labs Blaster GamePad Cobra driver for Linux
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.
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.
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
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
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 #include <linux/jiffies.h>
39 #define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver"
41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
42 MODULE_DESCRIPTION(DRIVER_DESC);
43 MODULE_LICENSE("GPL");
45 #define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
46 #define COBRA_LENGTH 36
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 };
51 struct gameport *gameport;
52 struct input_dev *dev[2];
59 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
62 unsigned char u, v, w;
67 int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
69 for (i = 0; i < 2; i++) {
71 t[i] = COBRA_MAX_STROBE;
74 local_irq_save(flags);
76 u = gameport_read(gameport);
80 v = gameport_read(gameport);
81 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
83 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
84 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
89 } while (t[0] > 0 || t[1] > 0);
91 local_irq_restore(flags);
95 for (i = 0; i < 2; i++) {
97 if (r[i] != COBRA_LENGTH) continue;
99 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
100 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
102 if (j < COBRA_LENGTH) ret |= (1 << i);
104 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
105 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
106 | ((buf[i] >> 11) & 0x1f00000);
113 static void cobra_poll(struct gameport *gameport)
115 struct cobra *cobra = gameport_get_drvdata(gameport);
116 struct input_dev *dev;
117 unsigned int data[2];
122 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
127 for (i = 0; i < 2; i++)
128 if (cobra->exists & r & (1 << i)) {
132 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
133 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
135 for (j = 0; cobra_btn[j]; j++)
136 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
143 static int cobra_open(struct input_dev *dev)
145 struct cobra *cobra = dev->private;
147 gameport_start_polling(cobra->gameport);
151 static void cobra_close(struct input_dev *dev)
153 struct cobra *cobra = dev->private;
155 gameport_stop_polling(cobra->gameport);
158 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
161 struct input_dev *input_dev;
162 unsigned int data[2];
166 cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
170 cobra->gameport = gameport;
172 gameport_set_drvdata(gameport, cobra);
174 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
178 cobra->exists = cobra_read_packet(gameport, data);
180 for (i = 0; i < 2; i++)
181 if ((cobra->exists >> i) & data[i] & 1) {
182 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
183 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
184 cobra->exists &= ~(1 << i);
187 if (!cobra->exists) {
192 gameport_set_poll_handler(gameport, cobra_poll);
193 gameport_set_poll_interval(gameport, 20);
195 for (i = 0; i < 2; i++) {
196 if (~(cobra->exists >> i) & 1)
199 cobra->dev[i] = input_dev = input_allocate_device();
205 snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
206 "%s/input%d", gameport->phys, i);
208 input_dev->name = "Creative Labs Blaster GamePad Cobra";
209 input_dev->phys = cobra->phys[i];
210 input_dev->id.bustype = BUS_GAMEPORT;
211 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
212 input_dev->id.product = 0x0008;
213 input_dev->id.version = 0x0100;
214 input_dev->cdev.dev = &gameport->dev;
215 input_dev->private = cobra;
217 input_dev->open = cobra_open;
218 input_dev->close = cobra_close;
220 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
221 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
222 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
223 for (j = 0; cobra_btn[j]; j++)
224 set_bit(cobra_btn[j], input_dev->keybit);
226 input_register_device(cobra->dev[i]);
231 fail3: for (i = 0; i < 2; i++)
233 input_unregister_device(cobra->dev[i]);
234 fail2: gameport_close(gameport);
235 fail1: gameport_set_drvdata(gameport, NULL);
240 static void cobra_disconnect(struct gameport *gameport)
242 struct cobra *cobra = gameport_get_drvdata(gameport);
245 for (i = 0; i < 2; i++)
246 if ((cobra->exists >> i) & 1)
247 input_unregister_device(cobra->dev[i]);
248 gameport_close(gameport);
249 gameport_set_drvdata(gameport, NULL);
253 static struct gameport_driver cobra_drv = {
257 .description = DRIVER_DESC,
258 .connect = cobra_connect,
259 .disconnect = cobra_disconnect,
262 static int __init cobra_init(void)
264 gameport_register_driver(&cobra_drv);
268 static void __exit cobra_exit(void)
270 gameport_unregister_driver(&cobra_drv);
273 module_init(cobra_init);
274 module_exit(cobra_exit);