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spaceorb.c

/*
 * $Id: spaceorb.c,v 1.15 2002/01/22 20:29:19 vojtech Exp $
 *
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *    David Thompson
 */

/*
 * SpaceTec SpaceOrb 360 and Avenger 6dof controller 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/init.h>
#include <linux/input.h>
#include <linux/serio.h>

#define DRIVER_DESC     "SpaceTec SpaceOrb 360 and Avenger 6dof controller driver"

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

/*
 * Constants.
 */

#define SPACEORB_MAX_LENGTH   64

static int spaceorb_buttons[] = { BTN_TL, BTN_TR, BTN_Y, BTN_X, BTN_B, BTN_A };
static int spaceorb_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };

/*
 * Per-Orb data.
 */

struct spaceorb {
      struct input_dev *dev;
      int idx;
      unsigned char data[SPACEORB_MAX_LENGTH];
      char phys[32];
};

static unsigned char spaceorb_xor[] = "SpaceWare";

static unsigned char *spaceorb_errors[] = { "EEPROM storing 0 failed", "Receive queue overflow", "Transmit queue timeout",
            "Bad packet", "Power brown-out", "EEPROM checksum error", "Hardware fault" };

/*
 * spaceorb_process_packet() decodes packets the driver receives from the
 * SpaceOrb.
 */

static void spaceorb_process_packet(struct spaceorb *spaceorb)
{
      struct input_dev *dev = spaceorb->dev;
      unsigned char *data = spaceorb->data;
      unsigned char c = 0;
      int axes[6];
      int i;

      if (spaceorb->idx < 2) return;
      for (i = 0; i < spaceorb->idx; i++) c ^= data[i];
      if (c) return;

      switch (data[0]) {

            case 'R':                     /* Reset packet */
                  spaceorb->data[spaceorb->idx - 1] = 0;
                  for (i = 1; i < spaceorb->idx && spaceorb->data[i] == ' '; i++);
                  printk(KERN_INFO "input: %s [%s] is %s\n",
                         dev->name, spaceorb->data + i, spaceorb->phys);
                  break;

            case 'D':                     /* Ball + button data */
                  if (spaceorb->idx != 12) return;
                  for (i = 0; i < 9; i++) spaceorb->data[i+2] ^= spaceorb_xor[i];
                  axes[0] = ( data[2]      << 3) | (data[ 3] >> 4);
                  axes[1] = ((data[3] & 0x0f) << 6) | (data[ 4] >> 1);
                  axes[2] = ((data[4] & 0x01) << 9) | (data[ 5] << 2) | (data[4] >> 5);
                  axes[3] = ((data[6] & 0x1f) << 5) | (data[ 7] >> 2);
                  axes[4] = ((data[7] & 0x03) << 8) | (data[ 8] << 1) | (data[7] >> 6);
                  axes[5] = ((data[9] & 0x3f) << 4) | (data[10] >> 3);
                  for (i = 0; i < 6; i++)
                        input_report_abs(dev, spaceorb_axes[i], axes[i] - ((axes[i] & 0x200) ? 1024 : 0));
                  for (i = 0; i < 6; i++)
                        input_report_key(dev, spaceorb_buttons[i], (data[1] >> i) & 1);
                  break;

            case 'K':                     /* Button data */
                  if (spaceorb->idx != 5) return;
                  for (i = 0; i < 6; i++)
                        input_report_key(dev, spaceorb_buttons[i], (data[2] >> i) & 1);

                  break;

            case 'E':                     /* Error packet */
                  if (spaceorb->idx != 4) return;
                  printk(KERN_ERR "spaceorb: Device error. [ ");
                  for (i = 0; i < 7; i++) if (data[1] & (1 << i)) printk("%s ", spaceorb_errors[i]);
                  printk("]\n");
                  break;
      }

      input_sync(dev);
}

static irqreturn_t spaceorb_interrupt(struct serio *serio,
            unsigned char data, unsigned int flags)
{
      struct spaceorb* spaceorb = serio_get_drvdata(serio);

      if (~data & 0x80) {
            if (spaceorb->idx) spaceorb_process_packet(spaceorb);
            spaceorb->idx = 0;
      }
      if (spaceorb->idx < SPACEORB_MAX_LENGTH)
            spaceorb->data[spaceorb->idx++] = data & 0x7f;
      return IRQ_HANDLED;
}

/*
 * spaceorb_disconnect() is the opposite of spaceorb_connect()
 */

static void spaceorb_disconnect(struct serio *serio)
{
      struct spaceorb* spaceorb = serio_get_drvdata(serio);

      serio_close(serio);
      serio_set_drvdata(serio, NULL);
      input_unregister_device(spaceorb->dev);
      kfree(spaceorb);
}

/*
 * spaceorb_connect() is the routine that is called when someone adds a
 * new serio device that supports SpaceOrb/Avenger protocol and registers
 * it as an input device.
 */

static int spaceorb_connect(struct serio *serio, struct serio_driver *drv)
{
      struct spaceorb *spaceorb;
      struct input_dev *input_dev;
      int err = -ENOMEM;
      int i;

      spaceorb = kzalloc(sizeof(struct spaceorb), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!spaceorb || !input_dev)
            goto fail1;

      spaceorb->dev = input_dev;
      snprintf(spaceorb->phys, sizeof(spaceorb->phys), "%s/input0", serio->phys);

      input_dev->name = "SpaceTec SpaceOrb 360 / Avenger";
      input_dev->phys = spaceorb->phys;
      input_dev->id.bustype = BUS_RS232;
      input_dev->id.vendor = SERIO_SPACEORB;
      input_dev->id.product = 0x0001;
      input_dev->id.version = 0x0100;
      input_dev->dev.parent = &serio->dev;

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

      for (i = 0; i < 6; i++)
            set_bit(spaceorb_buttons[i], input_dev->keybit);

      for (i = 0; i < 6; i++)
            input_set_abs_params(input_dev, spaceorb_axes[i], -508, 508, 0, 0);

      serio_set_drvdata(serio, spaceorb);

      err = serio_open(serio, drv);
      if (err)
            goto fail2;

      err = input_register_device(spaceorb->dev);
      if (err)
            goto fail3;

      return 0;

 fail3:     serio_close(serio);
 fail2:     serio_set_drvdata(serio, NULL);
 fail1:     input_free_device(input_dev);
      kfree(spaceorb);
      return err;
}

/*
 * The serio driver structure.
 */

static struct serio_device_id spaceorb_serio_ids[] = {
      {
            .type = SERIO_RS232,
            .proto      = SERIO_SPACEORB,
            .id   = SERIO_ANY,
            .extra      = SERIO_ANY,
      },
      { 0 }
};

MODULE_DEVICE_TABLE(serio, spaceorb_serio_ids);

static struct serio_driver spaceorb_drv = {
      .driver           = {
            .name = "spaceorb",
      },
      .description      = DRIVER_DESC,
      .id_table   = spaceorb_serio_ids,
      .interrupt  = spaceorb_interrupt,
      .connect    = spaceorb_connect,
      .disconnect = spaceorb_disconnect,
};

/*
 * The functions for inserting/removing us as a module.
 */

static int __init spaceorb_init(void)
{
      return serio_register_driver(&spaceorb_drv);
}

static void __exit spaceorb_exit(void)
{
      serio_unregister_driver(&spaceorb_drv);
}

module_init(spaceorb_init);
module_exit(spaceorb_exit);

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