drivers/input/joystick/cobra.c

   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);