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amijoy.c

/*
 * $Id: amijoy.c,v 1.13 2002/01/22 20:26:32 vojtech Exp $
 *
 *  Copyright (c) 1998-2001 Vojtech Pavlik
 */

/*
 * Driver for Amiga joysticks for Linux/m68k
 */

/*
 * 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/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>

#include <asm/system.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Driver for Amiga joysticks");
MODULE_LICENSE("GPL");

static int amijoy[2] = { 0, 1 };
module_param_array_named(map, amijoy, uint, NULL, 0);
MODULE_PARM_DESC(map, "Map of attached joysticks in form of <a>,<b> (default is 0,1)");

static int amijoy_used;
static DEFINE_MUTEX(amijoy_mutex);
static struct input_dev *amijoy_dev[2];
static char *amijoy_phys[2] = { "amijoy/input0", "amijoy/input1" };

static irqreturn_t amijoy_interrupt(int irq, void *dummy)
{
      int i, data = 0, button = 0;

      for (i = 0; i < 2; i++)
            if (amijoy[i]) {

                  switch (i) {
                        case 0: data = ~amiga_custom.joy0dat; button = (~ciaa.pra >> 6) & 1; break;
                        case 1: data = ~amiga_custom.joy1dat; button = (~ciaa.pra >> 7) & 1; break;
                  }

                  input_report_key(amijoy_dev[i], BTN_TRIGGER, button);

                  input_report_abs(amijoy_dev[i], ABS_X, ((data >> 1) & 1) - ((data >> 9) & 1));
                  data = ~(data ^ (data << 1));
                  input_report_abs(amijoy_dev[i], ABS_Y, ((data >> 1) & 1) - ((data >> 9) & 1));

                  input_sync(amijoy_dev[i]);
            }
      return IRQ_HANDLED;
}

static int amijoy_open(struct input_dev *dev)
{
      int err;

      err = mutex_lock_interruptible(&amijoy_mutex);
      if (err)
            return err;

      if (!amijoy_used && request_irq(IRQ_AMIGA_VERTB, amijoy_interrupt, 0, "amijoy", amijoy_interrupt)) {
            printk(KERN_ERR "amijoy.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
            err = -EBUSY;
            goto out;
      }

      amijoy_used++;
out:
      mutex_unlock(&amijoy_mutex);
      return err;
}

static void amijoy_close(struct input_dev *dev)
{
      mutex_lock(&amijoy_mutex);
      if (!--amijoy_used)
            free_irq(IRQ_AMIGA_VERTB, amijoy_interrupt);
      mutex_unlock(&amijoy_mutex);
}

static int __init amijoy_init(void)
{
      int i, j;
      int err;

      for (i = 0; i < 2; i++) {
            if (!amijoy[i])
                  continue;

            amijoy_dev[i] = input_allocate_device();
            if (!amijoy_dev[i]) {
                  err = -ENOMEM;
                  goto fail;
            }

            if (!request_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2, "amijoy [Denise]")) {
                  input_free_device(amijoy_dev[i]);
                  err = -EBUSY;
                  goto fail;
            }

            amijoy_dev[i]->name = "Amiga joystick";
            amijoy_dev[i]->phys = amijoy_phys[i];
            amijoy_dev[i]->id.bustype = BUS_AMIGA;
            amijoy_dev[i]->id.vendor = 0x0001;
            amijoy_dev[i]->id.product = 0x0003;
            amijoy_dev[i]->id.version = 0x0100;

            amijoy_dev[i]->open = amijoy_open;
            amijoy_dev[i]->close = amijoy_close;

            amijoy_dev[i]->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
            amijoy_dev[i]->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
            amijoy_dev[i]->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
                  BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
            for (j = 0; j < 2; j++) {
                  amijoy_dev[i]->absmin[ABS_X + j] = -1;
                  amijoy_dev[i]->absmax[ABS_X + j] = 1;
            }

            err = input_register_device(amijoy_dev[i]);
            if (err) {
                  input_free_device(amijoy_dev[i]);
                  goto fail;
            }
      }
      return 0;

 fail:      while (--i >= 0)
            if (amijoy[i]) {
                  input_unregister_device(amijoy_dev[i]);
                  release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
            }
      return err;
}

static void __exit amijoy_exit(void)
{
      int i;

      for (i = 0; i < 2; i++)
            if (amijoy[i]) {
                  input_unregister_device(amijoy_dev[i]);
                  release_mem_region(CUSTOM_PHYSADDR + 10 + i * 2, 2);
            }
}

module_init(amijoy_init);
module_exit(amijoy_exit);

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