xref: /linux/drivers/input/joystick/cobra.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
1 /*
2  * $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech 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 
41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
42 MODULE_DESCRIPTION(DRIVER_DESC);
43 MODULE_LICENSE("GPL");
44 
45 #define COBRA_MAX_STROBE	45	/* 45 us max wait for first strobe */
46 #define COBRA_LENGTH		36
47 
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 };
49 
50 struct 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 
59 static 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 
113 static 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 
143 static int cobra_open(struct input_dev *dev)
144 {
145 	struct cobra *cobra = dev->private;
146 
147 	gameport_start_polling(cobra->gameport);
148 	return 0;
149 }
150 
151 static void cobra_close(struct input_dev *dev)
152 {
153 	struct cobra *cobra = dev->private;
154 
155 	gameport_stop_polling(cobra->gameport);
156 }
157 
158 static 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 		sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i);
206 
207 		input_dev->name = "Creative Labs Blaster GamePad Cobra";
208 		input_dev->phys = cobra->phys[i];
209 		input_dev->id.bustype = BUS_GAMEPORT;
210 		input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
211 		input_dev->id.product = 0x0008;
212 		input_dev->id.version = 0x0100;
213 		input_dev->cdev.dev = &gameport->dev;
214 		input_dev->private = cobra;
215 
216 		input_dev->open = cobra_open;
217 		input_dev->close = cobra_close;
218 
219 		input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
220 		input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
221 		input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
222 		for (j = 0; cobra_btn[j]; j++)
223 			set_bit(cobra_btn[j], input_dev->keybit);
224 
225 		input_register_device(cobra->dev[i]);
226 	}
227 
228 	return 0;
229 
230  fail3:	for (i = 0; i < 2; i++)
231 		if (cobra->dev[i])
232 			input_unregister_device(cobra->dev[i]);
233  fail2:	gameport_close(gameport);
234  fail1:	gameport_set_drvdata(gameport, NULL);
235 	kfree(cobra);
236 	return err;
237 }
238 
239 static void cobra_disconnect(struct gameport *gameport)
240 {
241 	struct cobra *cobra = gameport_get_drvdata(gameport);
242 	int i;
243 
244 	for (i = 0; i < 2; i++)
245 		if ((cobra->exists >> i) & 1)
246 			input_unregister_device(cobra->dev[i]);
247 	gameport_close(gameport);
248 	gameport_set_drvdata(gameport, NULL);
249 	kfree(cobra);
250 }
251 
252 static struct gameport_driver cobra_drv = {
253 	.driver		= {
254 		.name	= "cobra",
255 	},
256 	.description	= DRIVER_DESC,
257 	.connect	= cobra_connect,
258 	.disconnect	= cobra_disconnect,
259 };
260 
261 static int __init cobra_init(void)
262 {
263 	gameport_register_driver(&cobra_drv);
264 	return 0;
265 }
266 
267 static void __exit cobra_exit(void)
268 {
269 	gameport_unregister_driver(&cobra_drv);
270 }
271 
272 module_init(cobra_init);
273 module_exit(cobra_exit);
274