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 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
27 */
28
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/slab.h>
32#include <linux/gameport.h>
33#include <linux/input.h>
34#include <linux/jiffies.h>
35
36#define DRIVER_DESC	"Creative Labs Blaster GamePad Cobra driver"
37
38MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
39MODULE_DESCRIPTION(DRIVER_DESC);
40MODULE_LICENSE("GPL");
41
42#define COBRA_MAX_STROBE	45	/* 45 us max wait for first strobe */
43#define COBRA_LENGTH		36
44
45static 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 };
46
47struct cobra {
48	struct gameport *gameport;
49	struct input_dev *dev[2];
50	int reads;
51	int bads;
52	unsigned char exists;
53	char phys[2][32];
54};
55
56static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
57{
58	unsigned long flags;
59	unsigned char u, v, w;
60	__u64 buf[2];
61	int r[2], t[2];
62	int i, j, ret;
63
64	int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
65
66	for (i = 0; i < 2; i++) {
67		r[i] = buf[i] = 0;
68		t[i] = COBRA_MAX_STROBE;
69	}
70
71	local_irq_save(flags);
72
73	u = gameport_read(gameport);
74
75	do {
76		t[0]--; t[1]--;
77		v = gameport_read(gameport);
78		for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
79			if (w & 0x30) {
80				if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
81					buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
82					t[i] = strobe;
83					u = v;
84				} else t[i] = 0;
85			}
86	} while (t[0] > 0 || t[1] > 0);
87
88	local_irq_restore(flags);
89
90	ret = 0;
91
92	for (i = 0; i < 2; i++) {
93
94		if (r[i] != COBRA_LENGTH) continue;
95
96		for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
97			buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
98
99		if (j < COBRA_LENGTH) ret |= (1 << i);
100
101		data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
102			| ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
103			| ((buf[i] >> 11) & 0x1f00000);
104
105	}
106
107	return ret;
108}
109
110static void cobra_poll(struct gameport *gameport)
111{
112	struct cobra *cobra = gameport_get_drvdata(gameport);
113	struct input_dev *dev;
114	unsigned int data[2];
115	int i, j, r;
116
117	cobra->reads++;
118
119	if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
120		cobra->bads++;
121		return;
122	}
123
124	for (i = 0; i < 2; i++)
125		if (cobra->exists & r & (1 << i)) {
126
127			dev = cobra->dev[i];
128
129			input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
130			input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
131
132			for (j = 0; cobra_btn[j]; j++)
133				input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
134
135			input_sync(dev);
136
137		}
138}
139
140static int cobra_open(struct input_dev *dev)
141{
142	struct cobra *cobra = input_get_drvdata(dev);
143
144	gameport_start_polling(cobra->gameport);
145	return 0;
146}
147
148static void cobra_close(struct input_dev *dev)
149{
150	struct cobra *cobra = input_get_drvdata(dev);
151
152	gameport_stop_polling(cobra->gameport);
153}
154
155static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
156{
157	struct cobra *cobra;
158	struct input_dev *input_dev;
159	unsigned int data[2];
160	int i, j;
161	int err;
162
163	cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
164	if (!cobra)
165		return -ENOMEM;
166
167	cobra->gameport = gameport;
168
169	gameport_set_drvdata(gameport, cobra);
170
171	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
172	if (err)
173		goto fail1;
174
175	cobra->exists = cobra_read_packet(gameport, data);
176
177	for (i = 0; i < 2; i++)
178		if ((cobra->exists >> i) & data[i] & 1) {
179			printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
180				" Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
181			cobra->exists &= ~(1 << i);
182		}
183
184	if (!cobra->exists) {
185		err = -ENODEV;
186		goto fail2;
187	}
188
189	gameport_set_poll_handler(gameport, cobra_poll);
190	gameport_set_poll_interval(gameport, 20);
191
192	for (i = 0; i < 2; i++) {
193		if (~(cobra->exists >> i) & 1)
194			continue;
195
196		cobra->dev[i] = input_dev = input_allocate_device();
197		if (!input_dev) {
198			err = -ENOMEM;
199			goto fail3;
200		}
201
202		snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
203			 "%s/input%d", gameport->phys, i);
204
205		input_dev->name = "Creative Labs Blaster GamePad Cobra";
206		input_dev->phys = cobra->phys[i];
207		input_dev->id.bustype = BUS_GAMEPORT;
208		input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
209		input_dev->id.product = 0x0008;
210		input_dev->id.version = 0x0100;
211		input_dev->dev.parent = &gameport->dev;
212
213		input_set_drvdata(input_dev, cobra);
214
215		input_dev->open = cobra_open;
216		input_dev->close = cobra_close;
217
218		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(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);
223
224		err = input_register_device(cobra->dev[i]);
225		if (err)
226			goto fail4;
227	}
228
229	return 0;
230
231 fail4:	input_free_device(cobra->dev[i]);
232 fail3:	while (--i >= 0)
233		if (cobra->dev[i])
234			input_unregister_device(cobra->dev[i]);
235 fail2:	gameport_close(gameport);
236 fail1:	gameport_set_drvdata(gameport, NULL);
237	kfree(cobra);
238	return err;
239}
240
241static void cobra_disconnect(struct gameport *gameport)
242{
243	struct cobra *cobra = gameport_get_drvdata(gameport);
244	int i;
245
246	for (i = 0; i < 2; i++)
247		if ((cobra->exists >> i) & 1)
248			input_unregister_device(cobra->dev[i]);
249	gameport_close(gameport);
250	gameport_set_drvdata(gameport, NULL);
251	kfree(cobra);
252}
253
254static struct gameport_driver cobra_drv = {
255	.driver		= {
256		.name	= "cobra",
257	},
258	.description	= DRIVER_DESC,
259	.connect	= cobra_connect,
260	.disconnect	= cobra_disconnect,
261};
262
263module_gameport_driver(cobra_drv);
264