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cobra.c

/*
 * $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech Exp $
 *
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 */

/*
 * Creative Labs Blaster GamePad Cobra driver for Linux
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/gameport.h>
#include <linux/input.h>
#include <linux/jiffies.h>

#define DRIVER_DESC     "Creative Labs Blaster GamePad Cobra driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define COBRA_MAX_STROBE      45    /* 45 us max wait for first strobe */
#define COBRA_LENGTH          36

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 };

struct cobra {
      struct gameport *gameport;
      struct input_dev *dev[2];
      int reads;
      int bads;
      unsigned char exists;
      char phys[2][32];
};

static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
{
      unsigned long flags;
      unsigned char u, v, w;
      __u64 buf[2];
      int r[2], t[2];
      int i, j, ret;

      int strobe = gameport_time(gameport, COBRA_MAX_STROBE);

      for (i = 0; i < 2; i++) {
            r[i] = buf[i] = 0;
            t[i] = COBRA_MAX_STROBE;
      }

      local_irq_save(flags);

      u = gameport_read(gameport);

      do {
            t[0]--; t[1]--;
            v = gameport_read(gameport);
            for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
                  if (w & 0x30) {
                        if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
                              buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
                              t[i] = strobe;
                              u = v;
                        } else t[i] = 0;
                  }
      } while (t[0] > 0 || t[1] > 0);

      local_irq_restore(flags);

      ret = 0;

      for (i = 0; i < 2; i++) {

            if (r[i] != COBRA_LENGTH) continue;

            for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
                  buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));

            if (j < COBRA_LENGTH) ret |= (1 << i);

            data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
                  | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
                  | ((buf[i] >> 11) & 0x1f00000);

      }

      return ret;
}

static void cobra_poll(struct gameport *gameport)
{
      struct cobra *cobra = gameport_get_drvdata(gameport);
      struct input_dev *dev;
      unsigned int data[2];
      int i, j, r;

      cobra->reads++;

      if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
            cobra->bads++;
            return;
      }

      for (i = 0; i < 2; i++)
            if (cobra->exists & r & (1 << i)) {

                  dev = cobra->dev[i];

                  input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
                  input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));

                  for (j = 0; cobra_btn[j]; j++)
                        input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));

                  input_sync(dev);

            }
}

static int cobra_open(struct input_dev *dev)
{
      struct cobra *cobra = input_get_drvdata(dev);

      gameport_start_polling(cobra->gameport);
      return 0;
}

static void cobra_close(struct input_dev *dev)
{
      struct cobra *cobra = input_get_drvdata(dev);

      gameport_stop_polling(cobra->gameport);
}

static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
{
      struct cobra *cobra;
      struct input_dev *input_dev;
      unsigned int data[2];
      int i, j;
      int err;

      cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
      if (!cobra)
            return -ENOMEM;

      cobra->gameport = gameport;

      gameport_set_drvdata(gameport, cobra);

      err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
      if (err)
            goto fail1;

      cobra->exists = cobra_read_packet(gameport, data);

      for (i = 0; i < 2; i++)
            if ((cobra->exists >> i) & data[i] & 1) {
                  printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
                        " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
                  cobra->exists &= ~(1 << i);
            }

      if (!cobra->exists) {
            err = -ENODEV;
            goto fail2;
      }

      gameport_set_poll_handler(gameport, cobra_poll);
      gameport_set_poll_interval(gameport, 20);

      for (i = 0; i < 2; i++) {
            if (~(cobra->exists >> i) & 1)
                  continue;

            cobra->dev[i] = input_dev = input_allocate_device();
            if (!input_dev) {
                  err = -ENOMEM;
                  goto fail3;
            }

            snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
                   "%s/input%d", gameport->phys, i);

            input_dev->name = "Creative Labs Blaster GamePad Cobra";
            input_dev->phys = cobra->phys[i];
            input_dev->id.bustype = BUS_GAMEPORT;
            input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
            input_dev->id.product = 0x0008;
            input_dev->id.version = 0x0100;
            input_dev->dev.parent = &gameport->dev;

            input_set_drvdata(input_dev, cobra);

            input_dev->open = cobra_open;
            input_dev->close = cobra_close;

            input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
            input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
            input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
            for (j = 0; cobra_btn[j]; j++)
                  set_bit(cobra_btn[j], input_dev->keybit);

            err = input_register_device(cobra->dev[i]);
            if (err)
                  goto fail4;
      }

      return 0;

 fail4:     input_free_device(cobra->dev[i]);
 fail3:     while (--i >= 0)
            if (cobra->dev[i])
                  input_unregister_device(cobra->dev[i]);
 fail2:     gameport_close(gameport);
 fail1:     gameport_set_drvdata(gameport, NULL);
      kfree(cobra);
      return err;
}

static void cobra_disconnect(struct gameport *gameport)
{
      struct cobra *cobra = gameport_get_drvdata(gameport);
      int i;

      for (i = 0; i < 2; i++)
            if ((cobra->exists >> i) & 1)
                  input_unregister_device(cobra->dev[i]);
      gameport_close(gameport);
      gameport_set_drvdata(gameport, NULL);
      kfree(cobra);
}

static struct gameport_driver cobra_drv = {
      .driver           = {
            .name = "cobra",
      },
      .description      = DRIVER_DESC,
      .connect    = cobra_connect,
      .disconnect = cobra_disconnect,
};

static int __init cobra_init(void)
{
      gameport_register_driver(&cobra_drv);
      return 0;
}

static void __exit cobra_exit(void)
{
      gameport_unregister_driver(&cobra_drv);
}

module_init(cobra_init);
module_exit(cobra_exit);

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