drivers/input/joystick/cobra.c

   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/init.h>
  33 #include <linux/gameport.h>
  34 #include <linux/input.h>
  35 #include <linux/jiffies.h>
  36
  37 #define DRIVER_DESC     "Creative Labs Blaster GamePad Cobra driver"
  38
  39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  40 MODULE_DESCRIPTION(DRIVER_DESC);
  41 MODULE_LICENSE("GPL");
  42
  43 #define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */
  44 #define COBRA_LENGTH            36
  45
  46 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 };
  47
  48 struct cobra {
  49         struct gameport *gameport;
  50         struct input_dev *dev[2];
  51         int reads;
  52         int bads;
  53         unsigned char exists;
  54         char phys[2][32];
  55 };
  56
  57 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
  58 {
  59         unsigned long flags;
  60         unsigned char u, v, w;
  61         __u64 buf[2];
  62         int r[2], t[2];
  63         int i, j, ret;
  64
  65         int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
  66
  67         for (i = 0; i < 2; i++) {
  68                 r[i] = buf[i] = 0;
  69                 t[i] = COBRA_MAX_STROBE;
  70         }
  71
  72         local_irq_save(flags);
  73
  74         u = gameport_read(gameport);
  75
  76         do {
  77                 t[0]--; t[1]--;
  78                 v = gameport_read(gameport);
  79                 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
  80                         if (w & 0x30) {
  81                                 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
  82                                         buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
  83                                         t[i] = strobe;
  84                                         u = v;
  85                                 } else t[i] = 0;
  86                         }
  87         } while (t[0] > 0 || t[1] > 0);
  88
  89         local_irq_restore(flags);
  90
  91         ret = 0;
  92
  93         for (i = 0; i < 2; i++) {
  94
  95                 if (r[i] != COBRA_LENGTH) continue;
  96
  97                 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
  98                         buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
  99
 100                 if (j < COBRA_LENGTH) ret |= (1 << i);
 101
 102                 data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
 103                         | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
 104                         | ((buf[i] >> 11) & 0x1f00000);
 105
 106         }
 107
 108         return ret;
 109 }
 110
 111 static void cobra_poll(struct gameport *gameport)
 112 {
 113         struct cobra *cobra = gameport_get_drvdata(gameport);
 114         struct input_dev *dev;
 115         unsigned int data[2];
 116         int i, j, r;
 117
 118         cobra->reads++;
 119
 120         if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
 121                 cobra->bads++;
 122                 return;
 123         }
 124
 125         for (i = 0; i < 2; i++)
 126                 if (cobra->exists & r & (1 << i)) {
 127
 128                         dev = cobra->dev[i];
 129
 130                         input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
 131                         input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
 132
 133                         for (j = 0; cobra_btn[j]; j++)
 134                                 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
 135
 136                         input_sync(dev);
 137
 138                 }
 139 }
 140
 141 static int cobra_open(struct input_dev *dev)
 142 {
 143         struct cobra *cobra = input_get_drvdata(dev);
 144
 145         gameport_start_polling(cobra->gameport);
 146         return 0;
 147 }
 148
 149 static void cobra_close(struct input_dev *dev)
 150 {
 151         struct cobra *cobra = input_get_drvdata(dev);
 152
 153         gameport_stop_polling(cobra->gameport);
 154 }
 155
 156 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
 157 {
 158         struct cobra *cobra;
 159         struct input_dev *input_dev;
 160         unsigned int data[2];
 161         int i, j;
 162         int err;
 163
 164         cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
 165         if (!cobra)
 166                 return -ENOMEM;
 167
 168         cobra->gameport = gameport;
 169
 170         gameport_set_drvdata(gameport, cobra);
 171
 172         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 173         if (err)
 174                 goto fail1;
 175
 176         cobra->exists = cobra_read_packet(gameport, data);
 177
 178         for (i = 0; i < 2; i++)
 179                 if ((cobra->exists >> i) & data[i] & 1) {
 180                         printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
 181                                 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
 182                         cobra->exists &= ~(1 << i);
 183                 }
 184
 185         if (!cobra->exists) {
 186                 err = -ENODEV;
 187                 goto fail2;
 188         }
 189
 190         gameport_set_poll_handler(gameport, cobra_poll);
 191         gameport_set_poll_interval(gameport, 20);
 192
 193         for (i = 0; i < 2; i++) {
 194                 if (~(cobra->exists >> i) & 1)
 195                         continue;
 196
 197                 cobra->dev[i] = input_dev = input_allocate_device();
 198                 if (!input_dev) {
 199                         err = -ENOMEM;
 200                         goto fail3;
 201                 }
 202
 203                 snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
 204                          "%s/input%d", gameport->phys, i);
 205
 206                 input_dev->name = "Creative Labs Blaster GamePad Cobra";
 207                 input_dev->phys = cobra->phys[i];
 208                 input_dev->id.bustype = BUS_GAMEPORT;
 209                 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
 210                 input_dev->id.product = 0x0008;
 211                 input_dev->id.version = 0x0100;
 212                 input_dev->dev.parent = &gameport->dev;
 213
 214                 input_set_drvdata(input_dev, cobra);
 215
 216                 input_dev->open = cobra_open;
 217                 input_dev->close = cobra_close;
 218
 219                 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(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                 err = input_register_device(cobra->dev[i]);
 226                 if (err)
 227                         goto fail4;
 228         }
 229
 230         return 0;
 231
 232  fail4: input_free_device(cobra->dev[i]);
 233  fail3: while (--i >= 0)
 234                 if (cobra->dev[i])
 235                         input_unregister_device(cobra->dev[i]);
 236  fail2: gameport_close(gameport);
 237  fail1: gameport_set_drvdata(gameport, NULL);
 238         kfree(cobra);
 239         return err;
 240 }
 241
 242 static void cobra_disconnect(struct gameport *gameport)
 243 {
 244         struct cobra *cobra = gameport_get_drvdata(gameport);
 245         int i;
 246
 247         for (i = 0; i < 2; i++)
 248                 if ((cobra->exists >> i) & 1)
 249                         input_unregister_device(cobra->dev[i]);
 250         gameport_close(gameport);
 251         gameport_set_drvdata(gameport, NULL);
 252         kfree(cobra);
 253 }
 254
 255 static struct gameport_driver cobra_drv = {
 256         .driver         = {
 257                 .name   = "cobra",
 258         },
 259         .description    = DRIVER_DESC,
 260         .connect        = cobra_connect,
 261         .disconnect     = cobra_disconnect,
 262 };
 263
 264 static int __init cobra_init(void)
 265 {
 266         gameport_register_driver(&cobra_drv);
 267         return 0;
 268 }
 269
 270 static void __exit cobra_exit(void)
 271 {
 272         gameport_unregister_driver(&cobra_drv);
 273 }
 274
 275 module_init(cobra_init);
 276 module_exit(cobra_exit);