1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 1999-2001 Vojtech Pavlik
4 */
5
6 /*
7 * Creative Labs Blaster GamePad Cobra driver for Linux
8 */
9
10 /*
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/gameport.h>
17 #include <linux/input.h>
18 #include <linux/jiffies.h>
19
20 #define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver"
21
22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
23 MODULE_DESCRIPTION(DRIVER_DESC);
24 MODULE_LICENSE("GPL");
25
26 #define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
27 #define COBRA_LENGTH 36
28
29 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 };
30
31 struct cobra {
32 struct gameport *gameport;
33 struct input_dev *dev[2];
34 int reads;
35 int bads;
36 unsigned char exists;
37 char phys[2][32];
38 };
39
cobra_read_packet(struct gameport * gameport,unsigned int * data)40 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
41 {
42 unsigned long flags;
43 unsigned char u, v, w;
44 __u64 buf[2];
45 int r[2], t[2];
46 int i, j, ret;
47
48 int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
49
50 for (i = 0; i < 2; i++) {
51 r[i] = buf[i] = 0;
52 t[i] = COBRA_MAX_STROBE;
53 }
54
55 local_irq_save(flags);
56
57 u = gameport_read(gameport);
58
59 do {
60 t[0]--; t[1]--;
61 v = gameport_read(gameport);
62 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
63 if (w & 0x30) {
64 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
65 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
66 t[i] = strobe;
67 u = v;
68 } else t[i] = 0;
69 }
70 } while (t[0] > 0 || t[1] > 0);
71
72 local_irq_restore(flags);
73
74 ret = 0;
75
76 for (i = 0; i < 2; i++) {
77
78 if (r[i] != COBRA_LENGTH) continue;
79
80 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
81 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
82
83 if (j < COBRA_LENGTH) ret |= (1 << i);
84
85 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
86 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
87 | ((buf[i] >> 11) & 0x1f00000);
88
89 }
90
91 return ret;
92 }
93
cobra_poll(struct gameport * gameport)94 static void cobra_poll(struct gameport *gameport)
95 {
96 struct cobra *cobra = gameport_get_drvdata(gameport);
97 struct input_dev *dev;
98 unsigned int data[2];
99 int i, j, r;
100
101 cobra->reads++;
102
103 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
104 cobra->bads++;
105 return;
106 }
107
108 for (i = 0; i < 2; i++)
109 if (cobra->exists & r & (1 << i)) {
110
111 dev = cobra->dev[i];
112
113 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
114 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
115
116 for (j = 0; cobra_btn[j]; j++)
117 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
118
119 input_sync(dev);
120
121 }
122 }
123
cobra_open(struct input_dev * dev)124 static int cobra_open(struct input_dev *dev)
125 {
126 struct cobra *cobra = input_get_drvdata(dev);
127
128 gameport_start_polling(cobra->gameport);
129 return 0;
130 }
131
cobra_close(struct input_dev * dev)132 static void cobra_close(struct input_dev *dev)
133 {
134 struct cobra *cobra = input_get_drvdata(dev);
135
136 gameport_stop_polling(cobra->gameport);
137 }
138
cobra_connect(struct gameport * gameport,struct gameport_driver * drv)139 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
140 {
141 struct cobra *cobra;
142 struct input_dev *input_dev;
143 unsigned int data[2];
144 int i, j;
145 int err;
146
147 cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
148 if (!cobra)
149 return -ENOMEM;
150
151 cobra->gameport = gameport;
152
153 gameport_set_drvdata(gameport, cobra);
154
155 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
156 if (err)
157 goto fail1;
158
159 cobra->exists = cobra_read_packet(gameport, data);
160
161 for (i = 0; i < 2; i++)
162 if ((cobra->exists >> i) & data[i] & 1) {
163 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
164 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
165 cobra->exists &= ~(1 << i);
166 }
167
168 if (!cobra->exists) {
169 err = -ENODEV;
170 goto fail2;
171 }
172
173 gameport_set_poll_handler(gameport, cobra_poll);
174 gameport_set_poll_interval(gameport, 20);
175
176 for (i = 0; i < 2; i++) {
177 if (~(cobra->exists >> i) & 1)
178 continue;
179
180 cobra->dev[i] = input_dev = input_allocate_device();
181 if (!input_dev) {
182 err = -ENOMEM;
183 goto fail3;
184 }
185
186 snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
187 "%s/input%d", gameport->phys, i);
188
189 input_dev->name = "Creative Labs Blaster GamePad Cobra";
190 input_dev->phys = cobra->phys[i];
191 input_dev->id.bustype = BUS_GAMEPORT;
192 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
193 input_dev->id.product = 0x0008;
194 input_dev->id.version = 0x0100;
195 input_dev->dev.parent = &gameport->dev;
196
197 input_set_drvdata(input_dev, cobra);
198
199 input_dev->open = cobra_open;
200 input_dev->close = cobra_close;
201
202 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
203 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
204 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
205 for (j = 0; cobra_btn[j]; j++)
206 set_bit(cobra_btn[j], input_dev->keybit);
207
208 err = input_register_device(cobra->dev[i]);
209 if (err)
210 goto fail4;
211 }
212
213 return 0;
214
215 fail4: input_free_device(cobra->dev[i]);
216 fail3: while (--i >= 0)
217 if (cobra->dev[i])
218 input_unregister_device(cobra->dev[i]);
219 fail2: gameport_close(gameport);
220 fail1: gameport_set_drvdata(gameport, NULL);
221 kfree(cobra);
222 return err;
223 }
224
cobra_disconnect(struct gameport * gameport)225 static void cobra_disconnect(struct gameport *gameport)
226 {
227 struct cobra *cobra = gameport_get_drvdata(gameport);
228 int i;
229
230 for (i = 0; i < 2; i++)
231 if ((cobra->exists >> i) & 1)
232 input_unregister_device(cobra->dev[i]);
233 gameport_close(gameport);
234 gameport_set_drvdata(gameport, NULL);
235 kfree(cobra);
236 }
237
238 static struct gameport_driver cobra_drv = {
239 .driver = {
240 .name = "cobra",
241 },
242 .description = DRIVER_DESC,
243 .connect = cobra_connect,
244 .disconnect = cobra_disconnect,
245 };
246
247 module_gameport_driver(cobra_drv);
248