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 char* cobra_name = "Creative Labs Blaster GamePad Cobra";
49 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 };
52 struct gameport *gameport;
53 struct input_dev dev[2];
60 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
63 unsigned char u, v, w;
68 int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
70 for (i = 0; i < 2; i++) {
72 t[i] = COBRA_MAX_STROBE;
75 local_irq_save(flags);
77 u = gameport_read(gameport);
81 v = gameport_read(gameport);
82 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
84 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
85 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
90 } while (t[0] > 0 || t[1] > 0);
92 local_irq_restore(flags);
96 for (i = 0; i < 2; i++) {
98 if (r[i] != COBRA_LENGTH) continue;
100 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
101 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
103 if (j < COBRA_LENGTH) ret |= (1 << i);
105 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
106 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
107 | ((buf[i] >> 11) & 0x1f00000);
114 static void cobra_poll(struct gameport *gameport)
116 struct cobra *cobra = gameport_get_drvdata(gameport);
117 struct input_dev *dev;
118 unsigned int data[2];
123 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
128 for (i = 0; i < 2; i++)
129 if (cobra->exists & r & (1 << i)) {
131 dev = cobra->dev + i;
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));
136 for (j = 0; cobra_btn[j]; j++)
137 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
144 static int cobra_open(struct input_dev *dev)
146 struct cobra *cobra = dev->private;
148 gameport_start_polling(cobra->gameport);
152 static void cobra_close(struct input_dev *dev)
154 struct cobra *cobra = dev->private;
156 gameport_stop_polling(cobra->gameport);
159 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
162 unsigned int data[2];
166 if (!(cobra = kcalloc(1, 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) {
197 sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i);
199 cobra->dev[i].private = cobra;
200 cobra->dev[i].open = cobra_open;
201 cobra->dev[i].close = cobra_close;
203 cobra->dev[i].name = cobra_name;
204 cobra->dev[i].phys = cobra->phys[i];
205 cobra->dev[i].id.bustype = BUS_GAMEPORT;
206 cobra->dev[i].id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
207 cobra->dev[i].id.product = 0x0008;
208 cobra->dev[i].id.version = 0x0100;
210 cobra->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
212 input_set_abs_params(&cobra->dev[i], ABS_X, -1, 1, 0, 0);
213 input_set_abs_params(&cobra->dev[i], ABS_Y, -1, 1, 0, 0);
215 for (j = 0; cobra_btn[j]; j++)
216 set_bit(cobra_btn[j], cobra->dev[i].keybit);
218 input_register_device(&cobra->dev[i]);
219 printk(KERN_INFO "input: %s on %s\n", cobra_name, gameport->phys);
224 fail2: gameport_close(gameport);
225 fail1: gameport_set_drvdata(gameport, NULL);
230 static void cobra_disconnect(struct gameport *gameport)
232 struct cobra *cobra = gameport_get_drvdata(gameport);
235 for (i = 0; i < 2; i++)
236 if ((cobra->exists >> i) & 1)
237 input_unregister_device(cobra->dev + i);
238 gameport_close(gameport);
239 gameport_set_drvdata(gameport, NULL);
243 static struct gameport_driver cobra_drv = {
247 .description = DRIVER_DESC,
248 .connect = cobra_connect,
249 .disconnect = cobra_disconnect,
252 static int __init cobra_init(void)
254 gameport_register_driver(&cobra_drv);
258 static void __exit cobra_exit(void)
260 gameport_unregister_driver(&cobra_drv);
263 module_init(cobra_init);
264 module_exit(cobra_exit);