1/*
2 * $Id: cobra.c,v 1.1.1.1 2007/08/03 18:52:33 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#include <linux/jiffies.h>
38
39#define DRIVER_DESC	"Creative Labs Blaster GamePad Cobra driver"
40
41MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
42MODULE_DESCRIPTION(DRIVER_DESC);
43MODULE_LICENSE("GPL");
44
45#define COBRA_MAX_STROBE	45	/* 45 us max wait for first strobe */
46#define COBRA_LENGTH		36
47
48static 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
50struct cobra {
51	struct gameport *gameport;
52	struct input_dev *dev[2];
53	int reads;
54	int bads;
55	unsigned char exists;
56	char phys[2][32];
57};
58
59static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
60{
61	unsigned long flags;
62	unsigned char u, v, w;
63	__u64 buf[2];
64	int r[2], t[2];
65	int i, j, ret;
66
67	int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
68
69	for (i = 0; i < 2; i++) {
70		r[i] = buf[i] = 0;
71		t[i] = COBRA_MAX_STROBE;
72	}
73
74	local_irq_save(flags);
75
76	u = gameport_read(gameport);
77
78	do {
79		t[0]--; t[1]--;
80		v = gameport_read(gameport);
81		for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
82			if (w & 0x30) {
83				if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
84					buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
85					t[i] = strobe;
86					u = v;
87				} else t[i] = 0;
88			}
89	} while (t[0] > 0 || t[1] > 0);
90
91	local_irq_restore(flags);
92
93	ret = 0;
94
95	for (i = 0; i < 2; i++) {
96
97		if (r[i] != COBRA_LENGTH) continue;
98
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));
101
102		if (j < COBRA_LENGTH) ret |= (1 << i);
103
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);
107
108	}
109
110	return ret;
111}
112
113static void cobra_poll(struct gameport *gameport)
114{
115	struct cobra *cobra = gameport_get_drvdata(gameport);
116	struct input_dev *dev;
117	unsigned int data[2];
118	int i, j, r;
119
120	cobra->reads++;
121
122	if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
123		cobra->bads++;
124		return;
125	}
126
127	for (i = 0; i < 2; i++)
128		if (cobra->exists & r & (1 << i)) {
129
130			dev = cobra->dev[i];
131
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));
134
135			for (j = 0; cobra_btn[j]; j++)
136				input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
137
138			input_sync(dev);
139
140		}
141}
142
143static int cobra_open(struct input_dev *dev)
144{
145	struct cobra *cobra = input_get_drvdata(dev);
146
147	gameport_start_polling(cobra->gameport);
148	return 0;
149}
150
151static void cobra_close(struct input_dev *dev)
152{
153	struct cobra *cobra = input_get_drvdata(dev);
154
155	gameport_stop_polling(cobra->gameport);
156}
157
158static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
159{
160	struct cobra *cobra;
161	struct input_dev *input_dev;
162	unsigned int data[2];
163	int i, j;
164	int err;
165
166	cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
167	if (!cobra)
168		return -ENOMEM;
169
170	cobra->gameport = gameport;
171
172	gameport_set_drvdata(gameport, cobra);
173
174	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
175	if (err)
176		goto fail1;
177
178	cobra->exists = cobra_read_packet(gameport, data);
179
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);
185		}
186
187	if (!cobra->exists) {
188		err = -ENODEV;
189		goto fail2;
190	}
191
192	gameport_set_poll_handler(gameport, cobra_poll);
193	gameport_set_poll_interval(gameport, 20);
194
195	for (i = 0; i < 2; i++) {
196		if (~(cobra->exists >> i) & 1)
197			continue;
198
199		cobra->dev[i] = input_dev = input_allocate_device();
200		if (!input_dev) {
201			err = -ENOMEM;
202			goto fail3;
203		}
204
205		snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
206			 "%s/input%d", gameport->phys, i);
207
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->dev.parent = &gameport->dev;
215
216		input_set_drvdata(input_dev, cobra);
217
218		input_dev->open = cobra_open;
219		input_dev->close = cobra_close;
220
221		input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
222		input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
223		input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
224		for (j = 0; cobra_btn[j]; j++)
225			set_bit(cobra_btn[j], input_dev->keybit);
226
227		err = input_register_device(cobra->dev[i]);
228		if (err)
229			goto fail4;
230	}
231
232	return 0;
233
234 fail4:	input_free_device(cobra->dev[i]);
235 fail3:	while (--i >= 0)
236		if (cobra->dev[i])
237			input_unregister_device(cobra->dev[i]);
238 fail2:	gameport_close(gameport);
239 fail1:	gameport_set_drvdata(gameport, NULL);
240	kfree(cobra);
241	return err;
242}
243
244static void cobra_disconnect(struct gameport *gameport)
245{
246	struct cobra *cobra = gameport_get_drvdata(gameport);
247	int i;
248
249	for (i = 0; i < 2; i++)
250		if ((cobra->exists >> i) & 1)
251			input_unregister_device(cobra->dev[i]);
252	gameport_close(gameport);
253	gameport_set_drvdata(gameport, NULL);
254	kfree(cobra);
255}
256
257static struct gameport_driver cobra_drv = {
258	.driver		= {
259		.name	= "cobra",
260	},
261	.description	= DRIVER_DESC,
262	.connect	= cobra_connect,
263	.disconnect	= cobra_disconnect,
264};
265
266static int __init cobra_init(void)
267{
268	gameport_register_driver(&cobra_drv);
269	return 0;
270}
271
272static void __exit cobra_exit(void)
273{
274	gameport_unregister_driver(&cobra_drv);
275}
276
277module_init(cobra_init);
278module_exit(cobra_exit);
279