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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
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_MASK(EV_KEY) | BIT_MASK(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
