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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
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
