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
  38 #define DRIVER_DESC     "Creative Labs Blaster GamePad Cobra driver"
  39
  40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  41 MODULE_DESCRIPTION(DRIVER_DESC);
  42 MODULE_LICENSE("GPL");
  43
  44 #define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */
  45 #define COBRA_LENGTH            36
  46
  47 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 };
  48
  49 struct cobra {
  50         struct gameport *gameport;
  51         struct input_dev *dev[2];
  52         int reads;
  53         int bads;
  54         unsigned char exists;
  55         char phys[2][32];
  56 };
  57
  58 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
  59 {
  60         unsigned long flags;
  61         unsigned char u, v, w;
  62         __u64 buf[2];
  63         int r[2], t[2];
  64         int i, j, ret;
  65
  66         int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
  67
  68         for (i = 0; i < 2; i++) {
  69                 r[i] = buf[i] = 0;
  70                 t[i] = COBRA_MAX_STROBE;
  71         }
  72
  73         local_irq_save(flags);
  74
  75         u = gameport_read(gameport);
  76
  77         do {
  78                 t[0]--; t[1]--;
  79                 v = gameport_read(gameport);
  80                 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
  81                         if (w & 0x30) {
  82                                 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
  83                                         buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
  84                                         t[i] = strobe;
  85                                         u = v;
  86                                 } else t[i] = 0;
  87                         }
  88         } while (t[0] > 0 || t[1] > 0);
  89
  90         local_irq_restore(flags);
  91
  92         ret = 0;
  93
  94         for (i = 0; i < 2; i++) {
  95
  96                 if (r[i] != COBRA_LENGTH) continue;
  97
  98                 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
  99                         buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
 100
 101                 if (j < COBRA_LENGTH) ret |= (1 << i);
 102
 103                 data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
 104                         | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
 105                         | ((buf[i] >> 11) & 0x1f00000);
 106
 107         }
 108
 109         return ret;
 110 }
 111
 112 static void cobra_poll(struct gameport *gameport)
 113 {
 114         struct cobra *cobra = gameport_get_drvdata(gameport);
 115         struct input_dev *dev;
 116         unsigned int data[2];
 117         int i, j, r;
 118
 119         cobra->reads++;
 120
 121         if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
 122                 cobra->bads++;
 123                 return;
 124         }
 125
 126         for (i = 0; i < 2; i++)
 127                 if (cobra->exists & r & (1 << i)) {
 128
 129                         dev = cobra->dev[i];
 130
 131                         input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
 132                         input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
 133
 134                         for (j = 0; cobra_btn[j]; j++)
 135                                 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
 136
 137                         input_sync(dev);
 138
 139                 }
 140 }
 141
 142 static int cobra_open(struct input_dev *dev)
 143 {
 144         struct cobra *cobra = dev->private;
 145
 146         gameport_start_polling(cobra->gameport);
 147         return 0;
 148 }
 149
 150 static void cobra_close(struct input_dev *dev)
 151 {
 152         struct cobra *cobra = dev->private;
 153
 154         gameport_stop_polling(cobra->gameport);
 155 }
 156
 157 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
 158 {
 159         struct cobra *cobra;
 160         struct input_dev *input_dev;
 161         unsigned int data[2];
 162         int i, j;
 163         int err;
 164
 165         cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
 166         if (!cobra)
 167                 return -ENOMEM;
 168
 169         cobra->gameport = gameport;
 170
 171         gameport_set_drvdata(gameport, cobra);
 172
 173         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 174         if (err)
 175                 goto fail1;
 176
 177         cobra->exists = cobra_read_packet(gameport, data);
 178
 179         for (i = 0; i < 2; i++)
 180                 if ((cobra->exists >> i) & data[i] & 1) {
 181                         printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
 182                                 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
 183                         cobra->exists &= ~(1 << i);
 184                 }
 185
 186         if (!cobra->exists) {
 187                 err = -ENODEV;
 188                 goto fail2;
 189         }
 190
 191         gameport_set_poll_handler(gameport, cobra_poll);
 192         gameport_set_poll_interval(gameport, 20);
 193
 194         for (i = 0; i < 2; i++) {
 195                 if (~(cobra->exists >> i) & 1)
 196                         continue;
 197
 198                 cobra->dev[i] = input_dev = input_allocate_device();
 199                 if (!input_dev) {
 200                         err = -ENOMEM;
 201                         goto fail3;
 202                 }
 203
 204                 sprintf(cobra->phys[i], "%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->cdev.dev = &gameport->dev;
 213                 input_dev->private = cobra;
 214
 215                 input_dev->open = cobra_open;
 216                 input_dev->close = cobra_close;
 217
 218                 input_dev->evbit[0] = BIT(EV_KEY) | BIT(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                 input_register_device(cobra->dev[i]);
 225         }
 226
 227         return 0;
 228
 229  fail3: for (i = 0; i < 2; i++)
 230                 if (cobra->dev[i])
 231                         input_unregister_device(cobra->dev[i]);
 232  fail2: gameport_close(gameport);
 233  fail1: gameport_set_drvdata(gameport, NULL);
 234         kfree(cobra);
 235         return err;
 236 }
 237
 238 static void cobra_disconnect(struct gameport *gameport)
 239 {
 240         struct cobra *cobra = gameport_get_drvdata(gameport);
 241         int i;
 242
 243         for (i = 0; i < 2; i++)
 244                 if ((cobra->exists >> i) & 1)
 245                         input_unregister_device(cobra->dev[i]);
 246         gameport_close(gameport);
 247         gameport_set_drvdata(gameport, NULL);
 248         kfree(cobra);
 249 }
 250
 251 static struct gameport_driver cobra_drv = {
 252         .driver         = {
 253                 .name   = "cobra",
 254         },
 255         .description    = DRIVER_DESC,
 256         .connect        = cobra_connect,
 257         .disconnect     = cobra_disconnect,
 258 };
 259
 260 static int __init cobra_init(void)
 261 {
 262         gameport_register_driver(&cobra_drv);
 263         return 0;
 264 }
 265
 266 static void __exit cobra_exit(void)
 267 {
 268         gameport_unregister_driver(&cobra_drv);
 269 }
 270
 271 module_init(cobra_init);
 272 module_exit(cobra_exit);