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turbografx.c

/*
 * $Id: turbografx.c,v 1.14 2002/01/22 20:30:39 vojtech Exp $
 *
 *  Copyright (c) 1998-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *    Steffen Schwenke
 */

/*
 * TurboGraFX parallel port interface 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/parport.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/mutex.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("TurboGraFX parallel port interface driver");
MODULE_LICENSE("GPL");

#define TGFX_MAX_PORTS        3
#define TGFX_MAX_DEVICES      7

struct tgfx_config {
      int args[TGFX_MAX_DEVICES + 1];
      unsigned int nargs;
};

static struct tgfx_config tgfx_cfg[TGFX_MAX_PORTS] __initdata;

module_param_array_named(map, tgfx_cfg[0].args, int, &tgfx_cfg[0].nargs, 0);
MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<js1>,<js2>,..<js7>");
module_param_array_named(map2, tgfx_cfg[1].args, int, &tgfx_cfg[1].nargs, 0);
MODULE_PARM_DESC(map2, "Describes second set of devices");
module_param_array_named(map3, tgfx_cfg[2].args, int, &tgfx_cfg[2].nargs, 0);
MODULE_PARM_DESC(map3, "Describes third set of devices");

#define TGFX_REFRESH_TIME     HZ/100      /* 10 ms */

#define TGFX_TRIGGER          0x08
#define TGFX_UP               0x10
#define TGFX_DOWN       0x20
#define TGFX_LEFT       0x40
#define TGFX_RIGHT            0x80

#define TGFX_THUMB            0x02
#define TGFX_THUMB2           0x04
#define TGFX_TOP        0x01
#define TGFX_TOP2       0x08

static int tgfx_buttons[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2 };

static struct tgfx {
      struct pardevice *pd;
      struct timer_list timer;
      struct input_dev *dev[TGFX_MAX_DEVICES];
      char name[TGFX_MAX_DEVICES][64];
      char phys[TGFX_MAX_DEVICES][32];
      int sticks;
      int used;
      struct mutex sem;
} *tgfx_base[TGFX_MAX_PORTS];

/*
 * tgfx_timer() reads and analyzes TurboGraFX joystick data.
 */

static void tgfx_timer(unsigned long private)
{
      struct tgfx *tgfx = (void *) private;
      struct input_dev *dev;
      int data1, data2, i;

      for (i = 0; i < 7; i++)
            if (tgfx->sticks & (1 << i)) {

                  dev = tgfx->dev[i];

                  parport_write_data(tgfx->pd->port, ~(1 << i));
                  data1 = parport_read_status(tgfx->pd->port) ^ 0x7f;
                  data2 = parport_read_control(tgfx->pd->port) ^ 0x04;  /* CAVEAT parport */

                  input_report_abs(dev, ABS_X, !!(data1 & TGFX_RIGHT) - !!(data1 & TGFX_LEFT));
                  input_report_abs(dev, ABS_Y, !!(data1 & TGFX_DOWN ) - !!(data1 & TGFX_UP  ));

                  input_report_key(dev, BTN_TRIGGER, (data1 & TGFX_TRIGGER));
                  input_report_key(dev, BTN_THUMB,   (data2 & TGFX_THUMB  ));
                  input_report_key(dev, BTN_THUMB2,  (data2 & TGFX_THUMB2 ));
                  input_report_key(dev, BTN_TOP,     (data2 & TGFX_TOP    ));
                  input_report_key(dev, BTN_TOP2,    (data2 & TGFX_TOP2   ));

                  input_sync(dev);
            }

      mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
}

static int tgfx_open(struct input_dev *dev)
{
      struct tgfx *tgfx = input_get_drvdata(dev);
      int err;

      err = mutex_lock_interruptible(&tgfx->sem);
      if (err)
            return err;

      if (!tgfx->used++) {
            parport_claim(tgfx->pd);
            parport_write_control(tgfx->pd->port, 0x04);
            mod_timer(&tgfx->timer, jiffies + TGFX_REFRESH_TIME);
      }

      mutex_unlock(&tgfx->sem);
      return 0;
}

static void tgfx_close(struct input_dev *dev)
{
      struct tgfx *tgfx = input_get_drvdata(dev);

      mutex_lock(&tgfx->sem);
      if (!--tgfx->used) {
            del_timer_sync(&tgfx->timer);
            parport_write_control(tgfx->pd->port, 0x00);
            parport_release(tgfx->pd);
      }
      mutex_unlock(&tgfx->sem);
}



/*
 * tgfx_probe() probes for tg gamepads.
 */

static struct tgfx __init *tgfx_probe(int parport, int *n_buttons, int n_devs)
{
      struct tgfx *tgfx;
      struct input_dev *input_dev;
      struct parport *pp;
      struct pardevice *pd;
      int i, j;
      int err;

      pp = parport_find_number(parport);
      if (!pp) {
            printk(KERN_ERR "turbografx.c: no such parport\n");
            err = -EINVAL;
            goto err_out;
      }

      pd = parport_register_device(pp, "turbografx", NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);
      if (!pd) {
            printk(KERN_ERR "turbografx.c: parport busy already - lp.o loaded?\n");
            err = -EBUSY;
            goto err_put_pp;
      }

      tgfx = kzalloc(sizeof(struct tgfx), GFP_KERNEL);
      if (!tgfx) {
            printk(KERN_ERR "turbografx.c: Not enough memory\n");
            err = -ENOMEM;
            goto err_unreg_pardev;
      }

      mutex_init(&tgfx->sem);
      tgfx->pd = pd;
      init_timer(&tgfx->timer);
      tgfx->timer.data = (long) tgfx;
      tgfx->timer.function = tgfx_timer;

      for (i = 0; i < n_devs; i++) {
            if (n_buttons[i] < 1)
                  continue;

            if (n_buttons[i] > 6) {
                  printk(KERN_ERR "turbografx.c: Invalid number of buttons %d\n", n_buttons[i]);
                  err = -EINVAL;
                  goto err_unreg_devs;
            }

            tgfx->dev[i] = input_dev = input_allocate_device();
            if (!input_dev) {
                  printk(KERN_ERR "turbografx.c: Not enough memory for input device\n");
                  err = -ENOMEM;
                  goto err_unreg_devs;
            }

            tgfx->sticks |= (1 << i);
            snprintf(tgfx->name[i], sizeof(tgfx->name[i]),
                   "TurboGraFX %d-button Multisystem joystick", n_buttons[i]);
            snprintf(tgfx->phys[i], sizeof(tgfx->phys[i]),
                   "%s/input%d", tgfx->pd->port->name, i);

            input_dev->name = tgfx->name[i];
            input_dev->phys = tgfx->phys[i];
            input_dev->id.bustype = BUS_PARPORT;
            input_dev->id.vendor = 0x0003;
            input_dev->id.product = n_buttons[i];
            input_dev->id.version = 0x0100;

            input_set_drvdata(input_dev, tgfx);

            input_dev->open = tgfx_open;
            input_dev->close = tgfx_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; j < n_buttons[i]; j++)
                  set_bit(tgfx_buttons[j], input_dev->keybit);

            err = input_register_device(tgfx->dev[i]);
            if (err)
                  goto err_free_dev;
      }

        if (!tgfx->sticks) {
            printk(KERN_ERR "turbografx.c: No valid devices specified\n");
            err = -EINVAL;
            goto err_free_tgfx;
        }

      return tgfx;

 err_free_dev:
      input_free_device(tgfx->dev[i]);
 err_unreg_devs:
      while (--i >= 0)
            if (tgfx->dev[i])
                  input_unregister_device(tgfx->dev[i]);
 err_free_tgfx:
      kfree(tgfx);
 err_unreg_pardev:
      parport_unregister_device(pd);
 err_put_pp:
      parport_put_port(pp);
 err_out:
      return ERR_PTR(err);
}

static void tgfx_remove(struct tgfx *tgfx)
{
      int i;

      for (i = 0; i < TGFX_MAX_DEVICES; i++)
            if (tgfx->dev[i])
                  input_unregister_device(tgfx->dev[i]);
      parport_unregister_device(tgfx->pd);
      kfree(tgfx);
}

static int __init tgfx_init(void)
{
      int i;
      int have_dev = 0;
      int err = 0;

      for (i = 0; i < TGFX_MAX_PORTS; i++) {
            if (tgfx_cfg[i].nargs == 0 || tgfx_cfg[i].args[0] < 0)
                  continue;

            if (tgfx_cfg[i].nargs < 2) {
                  printk(KERN_ERR "turbografx.c: at least one joystick must be specified\n");
                  err = -EINVAL;
                  break;
            }

            tgfx_base[i] = tgfx_probe(tgfx_cfg[i].args[0],
                                tgfx_cfg[i].args + 1,
                                tgfx_cfg[i].nargs - 1);
            if (IS_ERR(tgfx_base[i])) {
                  err = PTR_ERR(tgfx_base[i]);
                  break;
            }

            have_dev = 1;
      }

      if (err) {
            while (--i >= 0)
                  if (tgfx_base[i])
                        tgfx_remove(tgfx_base[i]);
            return err;
      }

      return have_dev ? 0 : -ENODEV;
}

static void __exit tgfx_exit(void)
{
      int i;

      for (i = 0; i < TGFX_MAX_PORTS; i++)
            if (tgfx_base[i])
                  tgfx_remove(tgfx_base[i]);
}

module_init(tgfx_init);
module_exit(tgfx_exit);

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