/*

   *  Copyright (c) 1999-2001 Vojtech Pavlik
   */
  
  /*
   * Logitech WingMan Warrior joystick driver for Linux
   */
  
  /*
   * This program is free warftware; 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/module.h>
  #include <linux/slab.h>
  #include <linux/input.h>
  #include <linux/serio.h>
  #include <linux/init.h>
  
  #define DRIVER_DESC	"Logitech WingMan Warrior joystick driver"
  
  MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");
  
  /*
   * Constants.
   */
  
  #define WARRIOR_MAX_LENGTH	16
  static char warrior_lengths[] = { 0, 4, 12, 3, 4, 4, 0, 0 };

  
  /*
   * Per-Warrior data.
   */
  
  struct warrior {

  	struct input_dev *dev;

  	int idx, len;
  	unsigned char data[WARRIOR_MAX_LENGTH];
  	char phys[32];
  };
  
  /*
   * warrior_process_packet() decodes packets the driver receives from the
   * Warrior. It updates the data accordingly.
   */

  static void warrior_process_packet(struct warrior *warrior)

  {

  	struct input_dev *dev = warrior->dev;

  	unsigned char *data = warrior->data;
  
  	if (!warrior->idx) return;

  	switch ((data[0] >> 4) & 7) {
  		case 1:					/* Button data */
  			input_report_key(dev, BTN_TRIGGER,  data[3]       & 1);
  			input_report_key(dev, BTN_THUMB,   (data[3] >> 1) & 1);
  			input_report_key(dev, BTN_TOP,     (data[3] >> 2) & 1);
  			input_report_key(dev, BTN_TOP2,    (data[3] >> 3) & 1);
  			break;
  		case 3:					/* XY-axis info->data */
  			input_report_abs(dev, ABS_X, ((data[0] & 8) << 5) - (data[2] | ((data[0] & 4) << 5)));
  			input_report_abs(dev, ABS_Y, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));
  			break;
  		case 5:					/* Throttle, spinner, hat info->data */
  			input_report_abs(dev, ABS_THROTTLE, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));
  			input_report_abs(dev, ABS_HAT0X, (data[3] & 2 ? 1 : 0) - (data[3] & 1 ? 1 : 0));
  			input_report_abs(dev, ABS_HAT0Y, (data[3] & 8 ? 1 : 0) - (data[3] & 4 ? 1 : 0));
  			input_report_rel(dev, REL_DIAL,  (data[2] | ((data[0] & 4) << 5)) - ((data[0] & 8) << 5));
  			break;
  	}
  	input_sync(dev);
  }
  
  /*
   * warrior_interrupt() is called by the low level driver when characters
   * are ready for us. We then buffer them for further processing, or call the
   * packet processing routine.
   */
  
  static irqreturn_t warrior_interrupt(struct serio *serio,

  		unsigned char data, unsigned int flags)

  {
  	struct warrior *warrior = serio_get_drvdata(serio);
  
  	if (data & 0x80) {

  		if (warrior->idx) warrior_process_packet(warrior);

  		warrior->idx = 0;
  		warrior->len = warrior_lengths[(data >> 4) & 7];
  	}
  
  	if (warrior->idx < warrior->len)
  		warrior->data[warrior->idx++] = data;
  
  	if (warrior->idx == warrior->len) {

  		if (warrior->idx) warrior_process_packet(warrior);

  		warrior->idx = 0;
  		warrior->len = 0;
  	}
  	return IRQ_HANDLED;
  }
  
  /*
   * warrior_disconnect() is the opposite of warrior_connect()
   */
  
  static void warrior_disconnect(struct serio *serio)
  {
  	struct warrior *warrior = serio_get_drvdata(serio);

  	serio_close(serio);
  	serio_set_drvdata(serio, NULL);

  	input_unregister_device(warrior->dev);

  	kfree(warrior);
  }
  
  /*
   * warrior_connect() is the routine that is called when someone adds a
   * new serio device. It looks for the Warrior, and if found, registers
   * it as an input device.
   */
  
  static int warrior_connect(struct serio *serio, struct serio_driver *drv)
  {
  	struct warrior *warrior;

  	struct input_dev *input_dev;
  	int err = -ENOMEM;

  	warrior = kzalloc(sizeof(struct warrior), GFP_KERNEL);
  	input_dev = input_allocate_device();
  	if (!warrior || !input_dev)

  		goto fail1;

  	warrior->dev = input_dev;

  	snprintf(warrior->phys, sizeof(warrior->phys), "%s/input0", serio->phys);

  	input_dev->name = "Logitech WingMan Warrior";
  	input_dev->phys = warrior->phys;
  	input_dev->id.bustype = BUS_RS232;
  	input_dev->id.vendor = SERIO_WARRIOR;
  	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_REL) |
  		BIT_MASK(EV_ABS);
  	input_dev->keybit[BIT_WORD(BTN_TRIGGER)] = BIT_MASK(BTN_TRIGGER) |
  		BIT_MASK(BTN_THUMB) | BIT_MASK(BTN_TOP) | BIT_MASK(BTN_TOP2);
  	input_dev->relbit[0] = BIT_MASK(REL_DIAL);

  	input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 8);
  	input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 8);
  	input_set_abs_params(input_dev, ABS_THROTTLE, -112, 112, 0, 0);
  	input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);

  	input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0);

  
  	serio_set_drvdata(serio, warrior);
  
  	err = serio_open(serio, drv);

  	if (err)

  		goto fail2;
  
  	err = input_register_device(warrior->dev);
  	if (err)
  		goto fail3;

  
  	return 0;

   fail3:	serio_close(serio);
   fail2:	serio_set_drvdata(serio, NULL);
   fail1:	input_free_device(input_dev);

  	kfree(warrior);
  	return err;

  }
  
  /*
   * The serio driver structure.
   */
  
  static struct serio_device_id warrior_serio_ids[] = {
  	{
  		.type	= SERIO_RS232,
  		.proto	= SERIO_WARRIOR,
  		.id	= SERIO_ANY,
  		.extra	= SERIO_ANY,
  	},
  	{ 0 }
  };
  
  MODULE_DEVICE_TABLE(serio, warrior_serio_ids);
  
  static struct serio_driver warrior_drv = {
  	.driver		= {
  		.name	= "warrior",
  	},
  	.description	= DRIVER_DESC,
  	.id_table	= warrior_serio_ids,
  	.interrupt	= warrior_interrupt,
  	.connect	= warrior_connect,
  	.disconnect	= warrior_disconnect,
  };
  
  /*
   * The functions for inserting/removing us as a module.
   */
  
  static int __init warrior_init(void)
  {

  	return serio_register_driver(&warrior_drv);

  }
  
  static void __exit warrior_exit(void)
  {
  	serio_unregister_driver(&warrior_drv);
  }
  
  module_init(warrior_init);
  module_exit(warrior_exit);