drivers/input/joystick/grip.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Copyright (c) 1998-2001 Vojtech Pavlik
  */

 /*
  * Gravis/Kensington GrIP protocol joystick and gamepad driver for Linux
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/gameport.h>
 #include <linux/input.h>
 #include <linux/jiffies.h>

 #define DRIVER_DESC	"Gravis GrIP protocol joystick driver"

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

 #define GRIP_MODE_GPP		1
 #define GRIP_MODE_BD		2
 #define GRIP_MODE_XT		3
 #define GRIP_MODE_DC		4

 #define GRIP_LENGTH_GPP		24
 #define GRIP_STROBE_GPP		200	/* 200 us */
 #define GRIP_LENGTH_XT		4
 #define GRIP_STROBE_XT		64	/* 64 us */
 #define GRIP_MAX_CHUNKS_XT	10
 #define GRIP_MAX_BITS_XT	30

 struct grip {
 	struct gameport *gameport;
 	struct input_dev *dev[2];
 	unsigned char mode[2];
 	int reads;
 	int bads;
 	char phys[2][32];
 };

 static int grip_btn_gpp[] = { BTN_START, BTN_SELECT, BTN_TR2, BTN_Y, 0, BTN_TL2, BTN_A, BTN_B, BTN_X, 0, BTN_TL, BTN_TR, -1 };
 static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 };
 static int grip_btn_xt[] = { BTN_TRIGGER, BTN_THUMB, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_SELECT, BTN_START, BTN_MODE, -1 };
 static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 };

 static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 };
 static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
 static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 };
 static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };

 static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital",
 				"Gravis Xterminator Digital", "Gravis Xterminator DualControl" };
 static int *grip_abs[] = { NULL, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc };
 static int *grip_btn[] = { NULL, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc };
 static char grip_anx[] = { 0, 0, 3, 5, 5 };
 static char grip_cen[] = { 0, 0, 2, 2, 4 };

 /*
  * grip_gpp_read_packet() reads a Gravis GamePad Pro packet.
  */

 static int grip_gpp_read_packet(struct gameport *gameport, int shift, unsigned int *data)
 {
 	unsigned long flags;
 	unsigned char u, v;
 	unsigned int t;
 	int i;

 	int strobe = gameport_time(gameport, GRIP_STROBE_GPP);

 	data[0] = 0;
 	t = strobe;
 	i = 0;

 	local_irq_save(flags);

 	v = gameport_read(gameport) >> shift;

 	do {
 		t--;
 		u = v; v = (gameport_read(gameport) >> shift) & 3;
 		if (~v & u & 1) {
 			data[0] |= (v >> 1) << i++;
 			t = strobe;
 		}
 	} while (i < GRIP_LENGTH_GPP && t > 0);

 	local_irq_restore(flags);

 	if (i < GRIP_LENGTH_GPP) return -1;

 	for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
 		data[0] = data[0] >> 1 | (data[0] & 1) << (GRIP_LENGTH_GPP - 1);

 	return -(i == GRIP_LENGTH_GPP);
 }

 /*
  * grip_xt_read_packet() reads a Gravis Xterminator packet.
  */

 static int grip_xt_read_packet(struct gameport *gameport, int shift, unsigned int *data)
 {
 	unsigned int i, j, buf, crc;
 	unsigned char u, v, w;
 	unsigned long flags;
 	unsigned int t;
 	char status;

 	int strobe = gameport_time(gameport, GRIP_STROBE_XT);

 	data[0] = data[1] = data[2] = data[3] = 0;
 	status = buf = i = j = 0;
 	t = strobe;

 	local_irq_save(flags);

 	v = w = (gameport_read(gameport) >> shift) & 3;

 	do {
 		t--;
 		u = (gameport_read(gameport) >> shift) & 3;

 		if (u ^ v) {

 			if ((u ^ v) & 1) {
 				buf = (buf << 1) | (u >> 1);
 				t = strobe;
 				i++;
 			} else

 			if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) {
 				if (i == 20) {
 					crc = buf ^ (buf >> 7) ^ (buf >> 14);
 					if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) {
 						data[buf >> 18] = buf >> 4;
 						status |= 1 << (buf >> 18);
 					}
 					j++;
 				}
 				t = strobe;
 				buf = 0;
 				i = 0;
 			}
 			w = v;
 			v = u;
 		}

 	} while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0);

 	local_irq_restore(flags);

 	return -(status != 0xf);
 }

 /*
  * grip_timer() repeatedly polls the joysticks and generates events.
  */

 static void grip_poll(struct gameport *gameport)
 {
 	struct grip *grip = gameport_get_drvdata(gameport);
 	unsigned int data[GRIP_LENGTH_XT];
 	struct input_dev *dev;
 	int i, j;

 	for (i = 0; i < 2; i++) {

 		dev = grip->dev[i];
 		if (!dev)
 			continue;

 		grip->reads++;

 		switch (grip->mode[i]) {

 			case GRIP_MODE_GPP:

 				if (grip_gpp_read_packet(grip->gameport, (i << 1) + 4, data)) {
 					grip->bads++;
 					break;
 				}

 				input_report_abs(dev, ABS_X, ((*data >> 15) & 1) - ((*data >> 16) & 1));
 				input_report_abs(dev, ABS_Y, ((*data >> 13) & 1) - ((*data >> 12) & 1));

 				for (j = 0; j < 12; j++)
 					if (grip_btn_gpp[j])
 						input_report_key(dev, grip_btn_gpp[j], (*data >> j) & 1);

 				break;

 			case GRIP_MODE_BD:

 				if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
 					grip->bads++;
 					break;
 				}

 				input_report_abs(dev, ABS_X,        (data[0] >> 2) & 0x3f);
 				input_report_abs(dev, ABS_Y,  63 - ((data[0] >> 8) & 0x3f));
 				input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);

 				input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2]       & 1));
 				input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));

 				for (j = 0; j < 5; j++)
 					input_report_key(dev, grip_btn_bd[j], (data[3] >> (j + 4)) & 1);

 				break;

 			case GRIP_MODE_XT:

 				if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
 					grip->bads++;
 					break;
 				}

 				input_report_abs(dev, ABS_X,        (data[0] >> 2) & 0x3f);
 				input_report_abs(dev, ABS_Y,  63 - ((data[0] >> 8) & 0x3f));
 				input_report_abs(dev, ABS_BRAKE,    (data[1] >> 2) & 0x3f);
 				input_report_abs(dev, ABS_GAS,	    (data[1] >> 8) & 0x3f);
 				input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);

 				input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2]       & 1));
 				input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
 				input_report_abs(dev, ABS_HAT1X, ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1));
 				input_report_abs(dev, ABS_HAT1Y, ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1));

 				for (j = 0; j < 11; j++)
 					input_report_key(dev, grip_btn_xt[j], (data[3] >> (j + 3)) & 1);
 				break;

 			case GRIP_MODE_DC:

 				if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
 					grip->bads++;
 					break;
 				}

 				input_report_abs(dev, ABS_X,        (data[0] >> 2) & 0x3f);
 				input_report_abs(dev, ABS_Y,        (data[0] >> 8) & 0x3f);
 				input_report_abs(dev, ABS_RX,       (data[1] >> 2) & 0x3f);
 				input_report_abs(dev, ABS_RY,	    (data[1] >> 8) & 0x3f);
 				input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);

 				input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2]       & 1));
 				input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));

 				for (j = 0; j < 9; j++)
 					input_report_key(dev, grip_btn_dc[j], (data[3] >> (j + 3)) & 1);
 				break;


 		}

 		input_sync(dev);
 	}
 }

 static int grip_open(struct input_dev *dev)
 {
 	struct grip *grip = input_get_drvdata(dev);

 	gameport_start_polling(grip->gameport);
 	return 0;
 }

 static void grip_close(struct input_dev *dev)
 {
 	struct grip *grip = input_get_drvdata(dev);

 	gameport_stop_polling(grip->gameport);
 }

 static int grip_connect(struct gameport *gameport, struct gameport_driver *drv)
 {
 	struct grip *grip;
 	struct input_dev *input_dev;
 	unsigned int data[GRIP_LENGTH_XT];
 	int i, j, t;
 	int err;

 	grip = kzalloc(sizeof(*grip), GFP_KERNEL);
 	if (!grip)
 		return -ENOMEM;

 	grip->gameport = gameport;

 	gameport_set_drvdata(gameport, grip);

 	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 	if (err)
 		goto fail1;

 	for (i = 0; i < 2; i++) {
 		if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) {
 			grip->mode[i] = GRIP_MODE_GPP;
 			continue;
 		}
 		if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) {
 			if (!(data[3] & 7)) {
 				grip->mode[i] = GRIP_MODE_BD;
 				continue;
 			}
 			if (!(data[2] & 0xf0)) {
 				grip->mode[i] = GRIP_MODE_XT;
 				continue;
 			}
 			grip->mode[i] = GRIP_MODE_DC;
 			continue;
 		}
 	}

 	if (!grip->mode[0] && !grip->mode[1]) {
 		err = -ENODEV;
 		goto fail2;
 	}

 	gameport_set_poll_handler(gameport, grip_poll);
 	gameport_set_poll_interval(gameport, 20);

 	for (i = 0; i < 2; i++) {
 		if (!grip->mode[i])
 			continue;

 		grip->dev[i] = input_dev = input_allocate_device();
 		if (!input_dev) {
 			err = -ENOMEM;
 			goto fail3;
 		}

 		snprintf(grip->phys[i], sizeof(grip->phys[i]),
 			 "%s/input%d", gameport->phys, i);

 		input_dev->name = grip_name[grip->mode[i]];
 		input_dev->phys = grip->phys[i];
 		input_dev->id.bustype = BUS_GAMEPORT;
 		input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
 		input_dev->id.product = grip->mode[i];
 		input_dev->id.version = 0x0100;
 		input_dev->dev.parent = &gameport->dev;

 		input_set_drvdata(input_dev, grip);

 		input_dev->open = grip_open;
 		input_dev->close = grip_close;

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

 		for (j = 0; (t = grip_abs[grip->mode[i]][j]) >= 0; j++) {

 			if (j < grip_cen[grip->mode[i]])
 				input_set_abs_params(input_dev, t, 14, 52, 1, 2);
 			else if (j < grip_anx[grip->mode[i]])
 				input_set_abs_params(input_dev, t, 3, 57, 1, 0);
 			else
 				input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 		}

 		for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++)
 			if (t > 0)
 				set_bit(t, input_dev->keybit);

 		err = input_register_device(grip->dev[i]);
 		if (err)
 			goto fail4;
 	}

 	return 0;

  fail4:	input_free_device(grip->dev[i]);
  fail3:	while (--i >= 0)
 		if (grip->dev[i])
 			input_unregister_device(grip->dev[i]);
  fail2:	gameport_close(gameport);
  fail1:	gameport_set_drvdata(gameport, NULL);
 	kfree(grip);
 	return err;
 }

 static void grip_disconnect(struct gameport *gameport)
 {
 	struct grip *grip = gameport_get_drvdata(gameport);
 	int i;

 	for (i = 0; i < 2; i++)
 		if (grip->dev[i])
 			input_unregister_device(grip->dev[i]);
 	gameport_close(gameport);
 	gameport_set_drvdata(gameport, NULL);
 	kfree(grip);
 }

 static struct gameport_driver grip_drv = {
 	.driver		= {
 		.name	= "grip",
 		.owner	= THIS_MODULE,
 	},
 	.description	= DRIVER_DESC,
 	.connect	= grip_connect,
 	.disconnect	= grip_disconnect,
 };

 module_gameport_driver(grip_drv);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (c) 1998-2001 Vojtech Pavlik
	*/

	/*
	* Gravis/Kensington GrIP protocol joystick and gamepad driver for Linux
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/gameport.h>
	#include <linux/input.h>
	#include <linux/jiffies.h>

	#define DRIVER_DESC "Gravis GrIP protocol joystick driver"

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

	#define GRIP_MODE_GPP 1
	#define GRIP_MODE_BD 2
	#define GRIP_MODE_XT 3
	#define GRIP_MODE_DC 4

	#define GRIP_LENGTH_GPP 24
	#define GRIP_STROBE_GPP 200 /* 200 us */
	#define GRIP_LENGTH_XT 4
	#define GRIP_STROBE_XT 64 /* 64 us */
	#define GRIP_MAX_CHUNKS_XT 10
	#define GRIP_MAX_BITS_XT 30

	struct grip {
	struct gameport *gameport;
	struct input_dev *dev[2];
	unsigned char mode[2];
	int reads;
	int bads;
	char phys[2][32];
	};

	static int grip_btn_gpp[] = { BTN_START, BTN_SELECT, BTN_TR2, BTN_Y, 0, BTN_TL2, BTN_A, BTN_B, BTN_X, 0, BTN_TL, BTN_TR, -1 };
	static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 };
	static int grip_btn_xt[] = { BTN_TRIGGER, BTN_THUMB, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_SELECT, BTN_START, BTN_MODE, -1 };
	static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 };

	static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 };
	static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
	static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 };
	static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };

	static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital",
	"Gravis Xterminator Digital", "Gravis Xterminator DualControl" };
	static int *grip_abs[] = { NULL, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc };
	static int *grip_btn[] = { NULL, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc };
	static char grip_anx[] = { 0, 0, 3, 5, 5 };
	static char grip_cen[] = { 0, 0, 2, 2, 4 };

	/*
	* grip_gpp_read_packet() reads a Gravis GamePad Pro packet.
	*/

	static int grip_gpp_read_packet(struct gameport gameport, int shift, unsigned int data)
	{
	unsigned long flags;
	unsigned char u, v;
	unsigned int t;
	int i;

	int strobe = gameport_time(gameport, GRIP_STROBE_GPP);

	data[0] = 0;
	t = strobe;
	i = 0;

	local_irq_save(flags);

	v = gameport_read(gameport) >> shift;

	do {
	t--;
	u = v; v = (gameport_read(gameport) >> shift) & 3;
	if (~v & u & 1) {
	data[0] \|= (v >> 1) << i++;
	t = strobe;
	}
	} while (i < GRIP_LENGTH_GPP && t > 0);

	local_irq_restore(flags);

	if (i < GRIP_LENGTH_GPP) return -1;

	for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
	data[0] = data[0] >> 1 \| (data[0] & 1) << (GRIP_LENGTH_GPP - 1);

	return -(i == GRIP_LENGTH_GPP);
	}

	/*
	* grip_xt_read_packet() reads a Gravis Xterminator packet.
	*/

	static int grip_xt_read_packet(struct gameport gameport, int shift, unsigned int data)
	{
	unsigned int i, j, buf, crc;
	unsigned char u, v, w;
	unsigned long flags;
	unsigned int t;
	char status;

	int strobe = gameport_time(gameport, GRIP_STROBE_XT);

	data[0] = data[1] = data[2] = data[3] = 0;
	status = buf = i = j = 0;
	t = strobe;

	local_irq_save(flags);

	v = w = (gameport_read(gameport) >> shift) & 3;

	do {
	t--;
	u = (gameport_read(gameport) >> shift) & 3;

	if (u ^ v) {

	if ((u ^ v) & 1) {
	buf = (buf << 1) \| (u >> 1);
	t = strobe;
	i++;
	} else

	if ((((u ^ v) & (v ^ w)) >> 1) & ~(u \| v \| w) & 1) {
	if (i == 20) {
	crc = buf ^ (buf >> 7) ^ (buf >> 14);
	if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) {
	data[buf >> 18] = buf >> 4;
	status \|= 1 << (buf >> 18);
	}
	j++;
	}
	t = strobe;
	buf = 0;
	i = 0;
	}
	w = v;
	v = u;
	}

	} while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0);

	local_irq_restore(flags);

	return -(status != 0xf);
	}

	/*
	* grip_timer() repeatedly polls the joysticks and generates events.
	*/

	static void grip_poll(struct gameport *gameport)
	{
	struct grip *grip = gameport_get_drvdata(gameport);
	unsigned int data[GRIP_LENGTH_XT];
	struct input_dev *dev;
	int i, j;

	for (i = 0; i < 2; i++) {

	dev = grip->dev[i];
	if (!dev)
	continue;

	grip->reads++;

	switch (grip->mode[i]) {

	case GRIP_MODE_GPP:

	if (grip_gpp_read_packet(grip->gameport, (i << 1) + 4, data)) {
	grip->bads++;
	break;
	}

	input_report_abs(dev, ABS_X, ((data >> 15) & 1) - ((data >> 16) & 1));
	input_report_abs(dev, ABS_Y, ((data >> 13) & 1) - ((data >> 12) & 1));

	for (j = 0; j < 12; j++)
	if (grip_btn_gpp[j])
	input_report_key(dev, grip_btn_gpp[j], (*data >> j) & 1);

	break;

	case GRIP_MODE_BD:

	if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
	grip->bads++;
	break;
	}

	input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
	input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f));
	input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);

	input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
	input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));

	for (j = 0; j < 5; j++)
	input_report_key(dev, grip_btn_bd[j], (data[3] >> (j + 4)) & 1);

	break;

	case GRIP_MODE_XT:

	if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
	grip->bads++;
	break;
	}

	input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
	input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f));
	input_report_abs(dev, ABS_BRAKE, (data[1] >> 2) & 0x3f);
	input_report_abs(dev, ABS_GAS, (data[1] >> 8) & 0x3f);
	input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);

	input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
	input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
	input_report_abs(dev, ABS_HAT1X, ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1));
	input_report_abs(dev, ABS_HAT1Y, ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1));

	for (j = 0; j < 11; j++)
	input_report_key(dev, grip_btn_xt[j], (data[3] >> (j + 3)) & 1);
	break;

	case GRIP_MODE_DC:

	if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
	grip->bads++;
	break;
	}

	input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
	input_report_abs(dev, ABS_Y, (data[0] >> 8) & 0x3f);
	input_report_abs(dev, ABS_RX, (data[1] >> 2) & 0x3f);
	input_report_abs(dev, ABS_RY, (data[1] >> 8) & 0x3f);
	input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);

	input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
	input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));

	for (j = 0; j < 9; j++)
	input_report_key(dev, grip_btn_dc[j], (data[3] >> (j + 3)) & 1);
	break;


	}

	input_sync(dev);
	}
	}

	static int grip_open(struct input_dev *dev)
	{
	struct grip *grip = input_get_drvdata(dev);

	gameport_start_polling(grip->gameport);
	return 0;
	}

	static void grip_close(struct input_dev *dev)
	{
	struct grip *grip = input_get_drvdata(dev);

	gameport_stop_polling(grip->gameport);
	}

	static int grip_connect(struct gameport gameport, struct gameport_driver drv)
	{
	struct grip *grip;
	struct input_dev *input_dev;
	unsigned int data[GRIP_LENGTH_XT];
	int i, j, t;
	int err;

	grip = kzalloc(sizeof(*grip), GFP_KERNEL);
	if (!grip)
	return -ENOMEM;

	grip->gameport = gameport;

	gameport_set_drvdata(gameport, grip);

	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
	if (err)
	goto fail1;

	for (i = 0; i < 2; i++) {
	if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) {
	grip->mode[i] = GRIP_MODE_GPP;
	continue;
	}
	if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) {
	if (!(data[3] & 7)) {
	grip->mode[i] = GRIP_MODE_BD;
	continue;
	}
	if (!(data[2] & 0xf0)) {
	grip->mode[i] = GRIP_MODE_XT;
	continue;
	}
	grip->mode[i] = GRIP_MODE_DC;
	continue;
	}
	}

	if (!grip->mode[0] && !grip->mode[1]) {
	err = -ENODEV;
	goto fail2;
	}

	gameport_set_poll_handler(gameport, grip_poll);
	gameport_set_poll_interval(gameport, 20);

	for (i = 0; i < 2; i++) {
	if (!grip->mode[i])
	continue;

	grip->dev[i] = input_dev = input_allocate_device();
	if (!input_dev) {
	err = -ENOMEM;
	goto fail3;
	}

	snprintf(grip->phys[i], sizeof(grip->phys[i]),
	"%s/input%d", gameport->phys, i);

	input_dev->name = grip_name[grip->mode[i]];
	input_dev->phys = grip->phys[i];
	input_dev->id.bustype = BUS_GAMEPORT;
	input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS;
	input_dev->id.product = grip->mode[i];
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &gameport->dev;

	input_set_drvdata(input_dev, grip);

	input_dev->open = grip_open;
	input_dev->close = grip_close;

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

	for (j = 0; (t = grip_abs[grip->mode[i]][j]) >= 0; j++) {

	if (j < grip_cen[grip->mode[i]])
	input_set_abs_params(input_dev, t, 14, 52, 1, 2);
	else if (j < grip_anx[grip->mode[i]])
	input_set_abs_params(input_dev, t, 3, 57, 1, 0);
	else
	input_set_abs_params(input_dev, t, -1, 1, 0, 0);
	}

	for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++)
	if (t > 0)
	set_bit(t, input_dev->keybit);

	err = input_register_device(grip->dev[i]);
	if (err)
	goto fail4;
	}

	return 0;

	fail4: input_free_device(grip->dev[i]);
	fail3: while (--i >= 0)
	if (grip->dev[i])
	input_unregister_device(grip->dev[i]);
	fail2: gameport_close(gameport);
	fail1: gameport_set_drvdata(gameport, NULL);
	kfree(grip);
	return err;
	}

	static void grip_disconnect(struct gameport *gameport)
	{
	struct grip *grip = gameport_get_drvdata(gameport);
	int i;

	for (i = 0; i < 2; i++)
	if (grip->dev[i])
	input_unregister_device(grip->dev[i]);
	gameport_close(gameport);
	gameport_set_drvdata(gameport, NULL);
	kfree(grip);
	}

	static struct gameport_driver grip_drv = {
	.driver = {
	.name = "grip",
	.owner = THIS_MODULE,
	},
	.description = DRIVER_DESC,
	.connect = grip_connect,
	.disconnect = grip_disconnect,
	};

	module_gameport_driver(grip_drv);