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>
38 #define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver"
40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
41 MODULE_DESCRIPTION(DRIVER_DESC);
42 MODULE_LICENSE("GPL");
44 #define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
45 #define COBRA_LENGTH 36
47 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 };
50 struct gameport *gameport;
51 struct input_dev *dev[2];
58 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
61 unsigned char u, v, w;
66 int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
68 for (i = 0; i < 2; i++) {
70 t[i] = COBRA_MAX_STROBE;
73 local_irq_save(flags);
75 u = gameport_read(gameport);
79 v = gameport_read(gameport);
80 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
82 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
83 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
88 } while (t[0] > 0 || t[1] > 0);
90 local_irq_restore(flags);
94 for (i = 0; i < 2; i++) {
96 if (r[i] != COBRA_LENGTH) continue;
98 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
99 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
101 if (j < COBRA_LENGTH) ret |= (1 << i);
103 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
104 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
105 | ((buf[i] >> 11) & 0x1f00000);
112 static void cobra_poll(struct gameport *gameport)
114 struct cobra *cobra = gameport_get_drvdata(gameport);
115 struct input_dev *dev;
116 unsigned int data[2];
121 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
126 for (i = 0; i < 2; i++)
127 if (cobra->exists & r & (1 << i)) {
131 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
132 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
134 for (j = 0; cobra_btn[j]; j++)
135 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
142 static int cobra_open(struct input_dev *dev)
144 struct cobra *cobra = dev->private;
146 gameport_start_polling(cobra->gameport);
150 static void cobra_close(struct input_dev *dev)
152 struct cobra *cobra = dev->private;
154 gameport_stop_polling(cobra->gameport);
157 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
160 struct input_dev *input_dev;
161 unsigned int data[2];
165 cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
169 cobra->gameport = gameport;
171 gameport_set_drvdata(gameport, cobra);
173 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
177 cobra->exists = cobra_read_packet(gameport, data);
179 for (i = 0; i < 2; i++)
180 if ((cobra->exists >> i) & data[i] & 1) {
181 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
182 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
183 cobra->exists &= ~(1 << i);
186 if (!cobra->exists) {
191 gameport_set_poll_handler(gameport, cobra_poll);
192 gameport_set_poll_interval(gameport, 20);
194 for (i = 0; i < 2; i++) {
195 if (~(cobra->exists >> i) & 1)
198 cobra->dev[i] = input_dev = input_allocate_device();
204 sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i);
206 input_dev->name = "Creative Labs Blaster GamePad Cobra";
207 input_dev->phys = cobra->phys[i];
208 input_dev->id.bustype = BUS_GAMEPORT;
209 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
210 input_dev->id.product = 0x0008;
211 input_dev->id.version = 0x0100;
212 input_dev->cdev.dev = &gameport->dev;
213 input_dev->private = cobra;
215 input_dev->open = cobra_open;
216 input_dev->close = cobra_close;
218 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
219 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
220 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
221 for (j = 0; cobra_btn[j]; j++)
222 set_bit(cobra_btn[j], input_dev->keybit);
224 input_register_device(cobra->dev[i]);
229 fail3: for (i = 0; i < 2; i++)
231 input_unregister_device(cobra->dev[i]);
232 fail2: gameport_close(gameport);
233 fail1: gameport_set_drvdata(gameport, NULL);
238 static void cobra_disconnect(struct gameport *gameport)
240 struct cobra *cobra = gameport_get_drvdata(gameport);
243 for (i = 0; i < 2; i++)
244 if ((cobra->exists >> i) & 1)
245 input_unregister_device(cobra->dev[i]);
246 gameport_close(gameport);
247 gameport_set_drvdata(gameport, NULL);
251 static struct gameport_driver cobra_drv = {
255 .description = DRIVER_DESC,
256 .connect = cobra_connect,
257 .disconnect = cobra_disconnect,
260 static int __init cobra_init(void)
262 gameport_register_driver(&cobra_drv);
266 static void __exit cobra_exit(void)
268 gameport_unregister_driver(&cobra_drv);
271 module_init(cobra_init);
272 module_exit(cobra_exit);