/*

   *  Copyright (c) 1998-2001 Vojtech Pavlik
   *
   *   Based on the work of:
   *	Trystan Larey-Williams
   */
  
  /*
   * ThrustMaster DirectConnect (BSP) joystick family 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/delay.h>
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/gameport.h>
  #include <linux/input.h>

  #include <linux/jiffies.h>

  
  #define DRIVER_DESC	"ThrustMaster DirectConnect joystick driver"
  
  MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");
  
  #define TMDC_MAX_START		600	/* 600 us */
  #define TMDC_MAX_STROBE		60	/* 60 us */
  #define TMDC_MAX_LENGTH		13
  
  #define TMDC_MODE_M3DI		1
  #define TMDC_MODE_3DRP		3
  #define TMDC_MODE_AT		4
  #define TMDC_MODE_FM		8
  #define TMDC_MODE_FGP		163
  
  #define TMDC_BYTE_ID		10
  #define TMDC_BYTE_REV		11
  #define TMDC_BYTE_DEF		12
  
  #define TMDC_ABS		7
  #define TMDC_ABS_HAT		4
  #define TMDC_BTN		16

  static const unsigned char tmdc_byte_a[16] = { 0, 1, 3, 4, 6, 7 };
  static const unsigned char tmdc_byte_d[16] = { 2, 5, 8, 9 };

  static const signed char tmdc_abs[TMDC_ABS] =

  	{ ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE, ABS_RX, ABS_RY, ABS_RZ };

  static const signed char tmdc_abs_hat[TMDC_ABS_HAT] =

  	{ ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y };

  static const signed char tmdc_abs_at[TMDC_ABS] =

  	{ ABS_X, ABS_Y, ABS_RUDDER, -1, ABS_THROTTLE };

  static const signed char tmdc_abs_fm[TMDC_ABS] =

  	{ ABS_RX, ABS_RY, ABS_X, ABS_Y };

  static const short tmdc_btn_pad[TMDC_BTN] =

  	{ BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_START, BTN_SELECT, BTN_TL, BTN_TR };

  static const short tmdc_btn_joy[TMDC_BTN] =

  	{ BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_THUMB2, BTN_PINKIE,

  	  BTN_BASE3, BTN_BASE4, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z };

  static const short tmdc_btn_fm[TMDC_BTN] =

          { BTN_TRIGGER, BTN_C, BTN_B, BTN_A, BTN_THUMB, BTN_X, BTN_Y, BTN_Z, BTN_TOP, BTN_TOP2 };

  static const short tmdc_btn_at[TMDC_BTN] =

          { BTN_TRIGGER, BTN_THUMB2, BTN_PINKIE, BTN_THUMB, BTN_BASE6, BTN_BASE5, BTN_BASE4,
            BTN_BASE3, BTN_BASE2, BTN_BASE };

  static const struct {

          int x;
          int y;
  } tmdc_hat_to_axis[] = {{ 0, 0}, { 1, 0}, { 0,-1}, {-1, 0}, { 0, 1}};

  static const struct tmdc_model {
  	unsigned char id;
  	const char *name;
  	char abs;
  	char hats;
  	char btnc[4];
  	char btno[4];
  	const signed char *axes;
  	const short *buttons;
  } tmdc_models[] = {
  	{   1, "ThrustMaster Millenium 3D Inceptor",	  6, 2, { 4, 2 }, { 4, 6 }, tmdc_abs, tmdc_btn_joy },
  	{   3, "ThrustMaster Rage 3D Gamepad",		  2, 0, { 8, 2 }, { 0, 0 }, tmdc_abs, tmdc_btn_pad },
  	{   4, "ThrustMaster Attack Throttle",		  5, 2, { 4, 6 }, { 4, 2 }, tmdc_abs_at, tmdc_btn_at },
  	{   8, "ThrustMaster FragMaster",		  4, 0, { 8, 2 }, { 0, 0 }, tmdc_abs_fm, tmdc_btn_fm },
  	{ 163, "Thrustmaster Fusion GamePad",		  2, 0, { 8, 2 }, { 0, 0 }, tmdc_abs, tmdc_btn_pad },
  	{   0, "Unknown %d-axis, %d-button TM device %d", 0, 0, { 0, 0 }, { 0, 0 }, tmdc_abs, tmdc_btn_joy }
  };
  
  
  struct tmdc_port {
  	struct input_dev *dev;
  	char name[64];
  	char phys[32];
  	int mode;
  	const signed char *abs;
  	const short *btn;
  	unsigned char absc;
  	unsigned char btnc[4];
  	unsigned char btno[4];
  };

  struct tmdc {
  	struct gameport *gameport;

  	struct tmdc_port *port[2];
  #if 0
  	struct input_dev *dev[2];

  	char name[2][64];
  	char phys[2][32];
  	int mode[2];
  	signed char *abs[2];
  	short *btn[2];
  	unsigned char absc[2];
  	unsigned char btnc[2][4];
  	unsigned char btno[2][4];

  #endif

  	int reads;
  	int bads;
  	unsigned char exists;
  };
  
  /*
   * tmdc_read_packet() reads a ThrustMaster packet.
   */
  
  static int tmdc_read_packet(struct gameport *gameport, unsigned char data[2][TMDC_MAX_LENGTH])
  {
  	unsigned char u, v, w, x;
  	unsigned long flags;
  	int i[2], j[2], t[2], p, k;
  
  	p = gameport_time(gameport, TMDC_MAX_STROBE);
  
  	for (k = 0; k < 2; k++) {
  		t[k] = gameport_time(gameport, TMDC_MAX_START);
  		i[k] = j[k] = 0;
  	}
  
  	local_irq_save(flags);
  	gameport_trigger(gameport);
  
  	w = gameport_read(gameport) >> 4;
  
  	do {
  		x = w;
  		w = gameport_read(gameport) >> 4;
  
  		for (k = 0, v = w, u = x; k < 2; k++, v >>= 2, u >>= 2) {
  			if (~v & u & 2) {
  				if (t[k] <= 0 || i[k] >= TMDC_MAX_LENGTH) continue;
  				t[k] = p;
  				if (j[k] == 0) {				 /* Start bit */
  					if (~v & 1) t[k] = 0;
  					data[k][i[k]] = 0; j[k]++; continue;
  				}
  				if (j[k] == 9) {				/* Stop bit */
  					if (v & 1) t[k] = 0;
  					j[k] = 0; i[k]++; continue;
  				}
  				data[k][i[k]] |= (~v & 1) << (j[k]++ - 1);	/* Data bit */
  			}
  			t[k]--;
  		}
  	} while (t[0] > 0 || t[1] > 0);
  
  	local_irq_restore(flags);
  
  	return (i[0] == TMDC_MAX_LENGTH) | ((i[1] == TMDC_MAX_LENGTH) << 1);
  }

  static int tmdc_parse_packet(struct tmdc_port *port, unsigned char *data)
  {
  	int i, k, l;
  
  	if (data[TMDC_BYTE_ID] != port->mode)
  		return -1;
  
  	for (i = 0; i < port->absc; i++) {
  		if (port->abs[i] < 0)
  			return 0;
  
  		input_report_abs(port->dev, port->abs[i], data[tmdc_byte_a[i]]);
  	}
  
  	switch (port->mode) {
  
  		case TMDC_MODE_M3DI:
  
  			i = tmdc_byte_d[0];
  			input_report_abs(port->dev, ABS_HAT0X, ((data[i] >> 3) & 1) - ((data[i] >> 1) & 1));
  			input_report_abs(port->dev, ABS_HAT0Y, ((data[i] >> 2) & 1) - ( data[i]       & 1));
  			break;
  
  		case TMDC_MODE_AT:
  
  			i = tmdc_byte_a[3];
  			input_report_abs(port->dev, ABS_HAT0X, tmdc_hat_to_axis[(data[i] - 141) / 25].x);
  			input_report_abs(port->dev, ABS_HAT0Y, tmdc_hat_to_axis[(data[i] - 141) / 25].y);
  			break;
  
  	}
  
  	for (k = l = 0; k < 4; k++) {
  		for (i = 0; i < port->btnc[k]; i++)
  			input_report_key(port->dev, port->btn[i + l],
  				((data[tmdc_byte_d[k]] >> (i + port->btno[k])) & 1));
  		l += port->btnc[k];
  	}
  
  	input_sync(port->dev);
  
  	return 0;
  }

  /*
   * tmdc_poll() reads and analyzes ThrustMaster joystick data.
   */
  
  static void tmdc_poll(struct gameport *gameport)
  {
  	unsigned char data[2][TMDC_MAX_LENGTH];
  	struct tmdc *tmdc = gameport_get_drvdata(gameport);

  	unsigned char r, bad = 0;

  	int i;

  
  	tmdc->reads++;
  
  	if ((r = tmdc_read_packet(tmdc->gameport, data)) != tmdc->exists)
  		bad = 1;

  	else {
  		for (i = 0; i < 2; i++) {
  			if (r & (1 << i) & tmdc->exists) {

  				if (tmdc_parse_packet(tmdc->port[i], data[i]))
  					bad = 1;

  			}

  		}

  	}
  
  	tmdc->bads += bad;
  }
  
  static int tmdc_open(struct input_dev *dev)
  {

  	struct tmdc *tmdc = input_get_drvdata(dev);

  
  	gameport_start_polling(tmdc->gameport);
  	return 0;
  }
  
  static void tmdc_close(struct input_dev *dev)
  {

  	struct tmdc *tmdc = input_get_drvdata(dev);

  
  	gameport_stop_polling(tmdc->gameport);
  }

  static int tmdc_setup_port(struct tmdc *tmdc, int idx, unsigned char *data)
  {
  	const struct tmdc_model *model;
  	struct tmdc_port *port;
  	struct input_dev *input_dev;
  	int i, j, b = 0;

  	int err;

  
  	tmdc->port[idx] = port = kzalloc(sizeof (struct tmdc_port), GFP_KERNEL);
  	input_dev = input_allocate_device();
  	if (!port || !input_dev) {

  		err = -ENOMEM;
  		goto fail;

  	}
  
  	port->mode = data[TMDC_BYTE_ID];
  
  	for (model = tmdc_models; model->id && model->id != port->mode; model++)
  		/* empty */;
  
  	port->abs = model->axes;
  	port->btn = model->buttons;
  
  	if (!model->id) {
  		port->absc = data[TMDC_BYTE_DEF] >> 4;
  		for (i = 0; i < 4; i++)
  			port->btnc[i] = i < (data[TMDC_BYTE_DEF] & 0xf) ? 8 : 0;
  	} else {
  		port->absc = model->abs;
  		for (i = 0; i < 4; i++)
  			port->btnc[i] = model->btnc[i];
  	}
  
  	for (i = 0; i < 4; i++)
  		port->btno[i] = model->btno[i];
  
  	snprintf(port->name, sizeof(port->name), model->name,
  		 port->absc, (data[TMDC_BYTE_DEF] & 0xf) << 3, port->mode);
  	snprintf(port->phys, sizeof(port->phys), "%s/input%d", tmdc->gameport->phys, i);
  
  	port->dev = input_dev;
  
  	input_dev->name = port->name;
  	input_dev->phys = port->phys;
  	input_dev->id.bustype = BUS_GAMEPORT;
  	input_dev->id.vendor = GAMEPORT_ID_VENDOR_THRUSTMASTER;
  	input_dev->id.product = model->id;
  	input_dev->id.version = 0x0100;

  	input_dev->dev.parent = &tmdc->gameport->dev;

  
  	input_set_drvdata(input_dev, tmdc);

  
  	input_dev->open = tmdc_open;
  	input_dev->close = tmdc_close;

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

  
  	for (i = 0; i < port->absc && i < TMDC_ABS; i++)
  		if (port->abs[i] >= 0)
  			input_set_abs_params(input_dev, port->abs[i], 8, 248, 2, 4);
  
  	for (i = 0; i < model->hats && i < TMDC_ABS_HAT; i++)
  		input_set_abs_params(input_dev, tmdc_abs_hat[i], -1, 1, 0, 0);
  
  	for (i = 0; i < 4; i++) {
  		for (j = 0; j < port->btnc[i] && j < TMDC_BTN; j++)
  			set_bit(port->btn[j + b], input_dev->keybit);
  		b += port->btnc[i];
  	}

  	err = input_register_device(port->dev);
  	if (err)
  		goto fail;

  
  	return 0;

  
   fail:	input_free_device(input_dev);
  	kfree(port);
  	return err;

  }

  /*
   * tmdc_probe() probes for ThrustMaster type joysticks.
   */
  
  static int tmdc_connect(struct gameport *gameport, struct gameport_driver *drv)
  {

  	unsigned char data[2][TMDC_MAX_LENGTH];
  	struct tmdc *tmdc;

  	int i;

  	int err;

  	if (!(tmdc = kzalloc(sizeof(struct tmdc), GFP_KERNEL)))

  		return -ENOMEM;
  
  	tmdc->gameport = gameport;
  
  	gameport_set_drvdata(gameport, tmdc);
  
  	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
  	if (err)
  		goto fail1;
  
  	if (!(tmdc->exists = tmdc_read_packet(gameport, data))) {
  		err = -ENODEV;
  		goto fail2;
  	}
  
  	gameport_set_poll_handler(gameport, tmdc_poll);
  	gameport_set_poll_interval(gameport, 20);

  	for (i = 0; i < 2; i++) {
  		if (tmdc->exists & (1 << i)) {

  			err = tmdc_setup_port(tmdc, i, data[i]);
  			if (err)
  				goto fail3;

  		}

  	}

  
  	return 0;

   fail3: while (--i >= 0) {
  		if (tmdc->port[i]) {
  			input_unregister_device(tmdc->port[i]->dev);
  			kfree(tmdc->port[i]);
  		}
  	}
   fail2:	gameport_close(gameport);
   fail1:	gameport_set_drvdata(gameport, NULL);

  	kfree(tmdc);
  	return err;
  }
  
  static void tmdc_disconnect(struct gameport *gameport)
  {
  	struct tmdc *tmdc = gameport_get_drvdata(gameport);
  	int i;

  	for (i = 0; i < 2; i++) {
  		if (tmdc->port[i]) {
  			input_unregister_device(tmdc->port[i]->dev);
  			kfree(tmdc->port[i]);
  		}
  	}

  	gameport_close(gameport);
  	gameport_set_drvdata(gameport, NULL);
  	kfree(tmdc);
  }
  
  static struct gameport_driver tmdc_drv = {
  	.driver		= {
  		.name	= "tmdc",

  		.owner	= THIS_MODULE,

  	},
  	.description	= DRIVER_DESC,
  	.connect	= tmdc_connect,
  	.disconnect	= tmdc_disconnect,
  };
  
  static int __init tmdc_init(void)
  {

  	return gameport_register_driver(&tmdc_drv);

  }
  
  static void __exit tmdc_exit(void)
  {
  	gameport_unregister_driver(&tmdc_drv);
  }
  
  module_init(tmdc_init);
  module_exit(tmdc_exit);