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interact.c

/*
 * $Id: interact.c,v 1.16 2002/01/22 20:28:25 vojtech Exp $
 *
 *  Copyright (c) 2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *    Toby Deshane
 */

/*
 * InterAct digital gamepad/joystick 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/slab.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/gameport.h>
#include <linux/input.h>
#include <linux/jiffies.h>

#define DRIVER_DESC     "InterAct digital joystick driver"

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

#define INTERACT_MAX_START    600   /* 400 us */
#define INTERACT_MAX_STROBE   60    /* 40 us */
#define INTERACT_MAX_LENGTH   32    /* 32 bits */

#define INTERACT_TYPE_HHFX    0     /* HammerHead/FX */
#define INTERACT_TYPE_PP8D    1     /* ProPad 8 */

struct interact {
      struct gameport *gameport;
      struct input_dev *dev;
      int bads;
      int reads;
      unsigned char type;
      unsigned char length;
      char phys[32];
};

static short interact_abs_hhfx[] =
      { ABS_RX, ABS_RY, ABS_X, ABS_Y, ABS_HAT0X, ABS_HAT0Y, -1 };
static short interact_abs_pp8d[] =
      { ABS_X, ABS_Y, -1 };

static short interact_btn_hhfx[] =
      { BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL, BTN_TL2, BTN_TR2, BTN_MODE, BTN_SELECT, -1 };
static short interact_btn_pp8d[] =
      { BTN_C, BTN_TL, BTN_TR, BTN_A, BTN_B, BTN_Y, BTN_Z, BTN_X, -1 };

struct interact_type {
      int id;
      short *abs;
      short *btn;
      char *name;
      unsigned char length;
      unsigned char b8;
};

static struct interact_type interact_type[] = {
      { 0x6202, interact_abs_hhfx, interact_btn_hhfx, "InterAct HammerHead/FX",    32, 4 },
      { 0x53f8, interact_abs_pp8d, interact_btn_pp8d, "InterAct ProPad 8 Digital", 16, 0 },
      { 0 }};

/*
 * interact_read_packet() reads and InterAct joystick data.
 */

static int interact_read_packet(struct gameport *gameport, int length, u32 *data)
{
      unsigned long flags;
      unsigned char u, v;
      unsigned int t, s;
      int i;

      i = 0;
      data[0] = data[1] = data[2] = 0;
      t = gameport_time(gameport, INTERACT_MAX_START);
      s = gameport_time(gameport, INTERACT_MAX_STROBE);

      local_irq_save(flags);
      gameport_trigger(gameport);
      v = gameport_read(gameport);

      while (t > 0 && i < length) {
            t--;
            u = v; v = gameport_read(gameport);
            if (v & ~u & 0x40) {
                  data[0] = (data[0] << 1) | ((v >> 4) & 1);
                  data[1] = (data[1] << 1) | ((v >> 5) & 1);
                  data[2] = (data[2] << 1) | ((v >> 7) & 1);
                  i++;
                  t = s;
            }
      }

      local_irq_restore(flags);

      return i;
}

/*
 * interact_poll() reads and analyzes InterAct joystick data.
 */

static void interact_poll(struct gameport *gameport)
{
      struct interact *interact = gameport_get_drvdata(gameport);
      struct input_dev *dev = interact->dev;
      u32 data[3];
      int i;

      interact->reads++;

      if (interact_read_packet(interact->gameport, interact->length, data) < interact->length) {
            interact->bads++;
      } else {

            for (i = 0; i < 3; i++)
                  data[i] <<= INTERACT_MAX_LENGTH - interact->length;

            switch (interact->type) {

                  case INTERACT_TYPE_HHFX:

                        for (i = 0; i < 4; i++)
                              input_report_abs(dev, interact_abs_hhfx[i], (data[i & 1] >> ((i >> 1) << 3)) & 0xff);

                        for (i = 0; i < 2; i++)
                              input_report_abs(dev, ABS_HAT0Y - i,
                                    ((data[1] >> ((i << 1) + 17)) & 1)  - ((data[1] >> ((i << 1) + 16)) & 1));

                        for (i = 0; i < 8; i++)
                              input_report_key(dev, interact_btn_hhfx[i], (data[0] >> (i + 16)) & 1);

                        for (i = 0; i < 4; i++)
                              input_report_key(dev, interact_btn_hhfx[i + 8], (data[1] >> (i + 20)) & 1);

                        break;

                  case INTERACT_TYPE_PP8D:

                        for (i = 0; i < 2; i++)
                              input_report_abs(dev, interact_abs_pp8d[i],
                                    ((data[0] >> ((i << 1) + 20)) & 1)  - ((data[0] >> ((i << 1) + 21)) & 1));

                        for (i = 0; i < 8; i++)
                              input_report_key(dev, interact_btn_pp8d[i], (data[1] >> (i + 16)) & 1);

                        break;
            }
      }

      input_sync(dev);
}

/*
 * interact_open() is a callback from the input open routine.
 */

static int interact_open(struct input_dev *dev)
{
      struct interact *interact = input_get_drvdata(dev);

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

/*
 * interact_close() is a callback from the input close routine.
 */

static void interact_close(struct input_dev *dev)
{
      struct interact *interact = input_get_drvdata(dev);

      gameport_stop_polling(interact->gameport);
}

/*
 * interact_connect() probes for InterAct joysticks.
 */

static int interact_connect(struct gameport *gameport, struct gameport_driver *drv)
{
      struct interact *interact;
      struct input_dev *input_dev;
      __u32 data[3];
      int i, t;
      int err;

      interact = kzalloc(sizeof(struct interact), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!interact || !input_dev) {
            err = -ENOMEM;
            goto fail1;
      }

      interact->gameport = gameport;
      interact->dev = input_dev;

      gameport_set_drvdata(gameport, interact);

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

      i = interact_read_packet(gameport, INTERACT_MAX_LENGTH * 2, data);

      if (i != 32 || (data[0] >> 24) != 0x0c || (data[1] >> 24) != 0x02) {
            err = -ENODEV;
            goto fail2;
      }

      for (i = 0; interact_type[i].length; i++)
            if (interact_type[i].id == (data[2] >> 16))
                  break;

      if (!interact_type[i].length) {
            printk(KERN_WARNING "interact.c: Unknown joystick on %s. [len %d d0 %08x d1 %08x i2 %08x]\n",
                  gameport->phys, i, data[0], data[1], data[2]);
            err = -ENODEV;
            goto fail2;
      }

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

      snprintf(interact->phys, sizeof(interact->phys), "%s/input0", gameport->phys);

      interact->type = i;
      interact->length = interact_type[i].length;

      input_dev->name = interact_type[i].name;
      input_dev->phys = interact->phys;
      input_dev->id.bustype = BUS_GAMEPORT;
      input_dev->id.vendor = GAMEPORT_ID_VENDOR_INTERACT;
      input_dev->id.product = interact_type[i].id;
      input_dev->id.version = 0x0100;
      input_dev->dev.parent = &gameport->dev;

      input_set_drvdata(input_dev, interact);

      input_dev->open = interact_open;
      input_dev->close = interact_close;

      input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

      for (i = 0; (t = interact_type[interact->type].abs[i]) >= 0; i++) {
            set_bit(t, input_dev->absbit);
            if (i < interact_type[interact->type].b8) {
                  input_dev->absmin[t] = 0;
                  input_dev->absmax[t] = 255;
            } else {
                  input_dev->absmin[t] = -1;
                  input_dev->absmax[t] = 1;
            }
      }

      for (i = 0; (t = interact_type[interact->type].btn[i]) >= 0; i++)
            set_bit(t, input_dev->keybit);

      err = input_register_device(interact->dev);
      if (err)
            goto fail2;

      return 0;

fail2:      gameport_close(gameport);
fail1:  gameport_set_drvdata(gameport, NULL);
      input_free_device(input_dev);
      kfree(interact);
      return err;
}

static void interact_disconnect(struct gameport *gameport)
{
      struct interact *interact = gameport_get_drvdata(gameport);

      input_unregister_device(interact->dev);
      gameport_close(gameport);
      gameport_set_drvdata(gameport, NULL);
      kfree(interact);
}

static struct gameport_driver interact_drv = {
      .driver           = {
            .name = "interact",
      },
      .description      = DRIVER_DESC,
      .connect    = interact_connect,
      .disconnect = interact_disconnect,
};

static int __init interact_init(void)
{
      gameport_register_driver(&interact_drv);
      return 0;
}

static void __exit interact_exit(void)
{
      gameport_unregister_driver(&interact_drv);
}

module_init(interact_init);
module_exit(interact_exit);

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