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lightning.c

/*
 * $Id: lightning.c,v 1.20 2002/01/22 20:41:31 vojtech Exp $
 *
 *  Copyright (c) 1998-2001 Vojtech Pavlik
 */

/*
 * PDPI Lightning 4 gamecard 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 <asm/io.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gameport.h>
#include <linux/slab.h>

#define L4_PORT               0x201
#define L4_SELECT_ANALOG      0xa4
#define L4_SELECT_DIGITAL     0xa5
#define L4_SELECT_SECONDARY   0xa6
#define L4_CMD_ID       0x80
#define L4_CMD_GETCAL         0x92
#define L4_CMD_SETCAL         0x93
#define L4_ID                 0x04
#define L4_BUSY               0x01
#define L4_TIMEOUT            80    /* 80 us */

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("PDPI Lightning 4 gamecard driver");
MODULE_LICENSE("GPL");

struct l4 {
      struct gameport *gameport;
      unsigned char port;
};

static struct l4 l4_ports[8];

/*
 * l4_wait_ready() waits for the L4 to become ready.
 */

static int l4_wait_ready(void)
{
      unsigned int t = L4_TIMEOUT;

      while ((inb(L4_PORT) & L4_BUSY) && t > 0) t--;
      return -(t <= 0);
}

/*
 * l4_cooked_read() reads data from the Lightning 4.
 */

static int l4_cooked_read(struct gameport *gameport, int *axes, int *buttons)
{
      struct l4 *l4 = gameport->port_data;
      unsigned char status;
      int i, result = -1;

      outb(L4_SELECT_ANALOG, L4_PORT);
      outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT);

      if (inb(L4_PORT) & L4_BUSY) goto fail;
      outb(l4->port & 3, L4_PORT);

      if (l4_wait_ready()) goto fail;
      status = inb(L4_PORT);

      for (i = 0; i < 4; i++)
            if (status & (1 << i)) {
                  if (l4_wait_ready()) goto fail;
                  axes[i] = inb(L4_PORT);
                  if (axes[i] > 252) axes[i] = -1;
            }

      if (status & 0x10) {
            if (l4_wait_ready()) goto fail;
            *buttons = inb(L4_PORT) & 0x0f;
      }

      result = 0;

fail: outb(L4_SELECT_ANALOG, L4_PORT);
      return result;
}

static int l4_open(struct gameport *gameport, int mode)
{
      struct l4 *l4 = gameport->port_data;

        if (l4->port != 0 && mode != GAMEPORT_MODE_COOKED)
            return -1;
      outb(L4_SELECT_ANALOG, L4_PORT);
      return 0;
}

/*
 * l4_getcal() reads the L4 with calibration values.
 */

static int l4_getcal(int port, int *cal)
{
      int i, result = -1;

      outb(L4_SELECT_ANALOG, L4_PORT);
      outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
      if (inb(L4_PORT) & L4_BUSY)
            goto out;

      outb(L4_CMD_GETCAL, L4_PORT);
      if (l4_wait_ready())
            goto out;

      if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
            goto out;

      if (l4_wait_ready())
            goto out;
        outb(port & 3, L4_PORT);

      for (i = 0; i < 4; i++) {
            if (l4_wait_ready())
                  goto out;
            cal[i] = inb(L4_PORT);
      }

      result = 0;

out:  outb(L4_SELECT_ANALOG, L4_PORT);
      return result;
}

/*
 * l4_setcal() programs the L4 with calibration values.
 */

static int l4_setcal(int port, int *cal)
{
      int i, result = -1;

      outb(L4_SELECT_ANALOG, L4_PORT);
      outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
      if (inb(L4_PORT) & L4_BUSY)
            goto out;

      outb(L4_CMD_SETCAL, L4_PORT);
      if (l4_wait_ready())
            goto out;

      if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
            goto out;

      if (l4_wait_ready())
            goto out;
        outb(port & 3, L4_PORT);

      for (i = 0; i < 4; i++) {
            if (l4_wait_ready())
                  goto out;
            outb(cal[i], L4_PORT);
      }

      result = 0;

out:  outb(L4_SELECT_ANALOG, L4_PORT);
      return result;
}

/*
 * l4_calibrate() calibrates the L4 for the attached device, so
 * that the device's resistance fits into the L4's 8-bit range.
 */

static int l4_calibrate(struct gameport *gameport, int *axes, int *max)
{
      int i, t;
      int cal[4];
      struct l4 *l4 = gameport->port_data;

      if (l4_getcal(l4->port, cal))
            return -1;

      for (i = 0; i < 4; i++) {
            t = (max[i] * cal[i]) / 200;
            t = (t < 1) ? 1 : ((t > 255) ? 255 : t);
            axes[i] = (axes[i] < 0) ? -1 : (axes[i] * cal[i]) / t;
            axes[i] = (axes[i] > 252) ? 252 : axes[i];
            cal[i] = t;
      }

      if (l4_setcal(l4->port, cal))
            return -1;

      return 0;
}

static int __init l4_create_ports(int card_no)
{
      struct l4 *l4;
      struct gameport *port;
      int i, idx;

      for (i = 0; i < 4; i++) {

            idx = card_no * 4 + i;
            l4 = &l4_ports[idx];

            if (!(l4->gameport = port = gameport_allocate_port())) {
                  printk(KERN_ERR "lightning: Memory allocation failed\n");
                  while (--i >= 0) {
                        gameport_free_port(l4->gameport);
                        l4->gameport = NULL;
                  }
                  return -ENOMEM;
            }
            l4->port = idx;

            port->port_data = l4;
            port->open = l4_open;
            port->cooked_read = l4_cooked_read;
            port->calibrate = l4_calibrate;

            gameport_set_name(port, "PDPI Lightning 4");
            gameport_set_phys(port, "isa%04x/gameport%d", L4_PORT, idx);

            if (idx == 0)
                  port->io = L4_PORT;
      }

      return 0;
}

static int __init l4_add_card(int card_no)
{
      int cal[4] = { 255, 255, 255, 255 };
      int i, rev, result;
      struct l4 *l4;

      outb(L4_SELECT_ANALOG, L4_PORT);
      outb(L4_SELECT_DIGITAL + card_no, L4_PORT);

      if (inb(L4_PORT) & L4_BUSY)
            return -1;
      outb(L4_CMD_ID, L4_PORT);

      if (l4_wait_ready())
            return -1;

      if (inb(L4_PORT) != L4_SELECT_DIGITAL + card_no)
            return -1;

      if (l4_wait_ready())
            return -1;
      if (inb(L4_PORT) != L4_ID)
            return -1;

      if (l4_wait_ready())
            return -1;
      rev = inb(L4_PORT);

      if (!rev)
            return -1;

      result = l4_create_ports(card_no);
      if (result)
            return result;

      printk(KERN_INFO "gameport: PDPI Lightning 4 %s card v%d.%d at %#x\n",
            card_no ? "secondary" : "primary", rev >> 4, rev, L4_PORT);

      for (i = 0; i < 4; i++) {
            l4 = &l4_ports[card_no * 4 + i];

            if (rev > 0x28)         /* on 2.9+ the setcal command works correctly */
                  l4_setcal(l4->port, cal);
            gameport_register_port(l4->gameport);
      }

      return 0;
}

static int __init l4_init(void)
{
      int i, cards = 0;

      if (!request_region(L4_PORT, 1, "lightning"))
            return -EBUSY;

      for (i = 0; i < 2; i++)
            if (l4_add_card(i) == 0)
                  cards++;

      outb(L4_SELECT_ANALOG, L4_PORT);

      if (!cards) {
            release_region(L4_PORT, 1);
            return -ENODEV;
      }

      return 0;
}

static void __exit l4_exit(void)
{
      int i;
      int cal[4] = { 59, 59, 59, 59 };

      for (i = 0; i < 8; i++)
            if (l4_ports[i].gameport) {
                  l4_setcal(l4_ports[i].port, cal);
                  gameport_unregister_port(l4_ports[i].gameport);
            }

      outb(L4_SELECT_ANALOG, L4_PORT);
      release_region(L4_PORT, 1);
}

module_init(l4_init);
module_exit(l4_exit);

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