drivers/input/joystick/analog.c - LeafOS-Devices/android_kernel_samsung_universal7904 - Gitiles

 /*
  * $Id: analog.c,v 1.68 2002/01/22 20:18:32 vojtech Exp $
  *
  *  Copyright (c) 1996-2001 Vojtech Pavlik
  */

 /*
  * Analog joystick and gamepad 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/module.h>
 #include <linux/moduleparam.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/gameport.h>
 #include <linux/jiffies.h>
 #include <asm/timex.h>

 #define DRIVER_DESC	"Analog joystick and gamepad driver"

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

 /*
  * Option parsing.
  */

 #define ANALOG_PORTS		16

 static char *js[ANALOG_PORTS];
 static int js_nargs;
 static int analog_options[ANALOG_PORTS];
 module_param_array_named(map, js, charp, &js_nargs, 0);
 MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");

 __obsolete_setup("js=");

 /*
  * Times, feature definitions.
  */

 #define ANALOG_RUDDER		0x00004
 #define ANALOG_THROTTLE		0x00008
 #define ANALOG_AXES_STD		0x0000f
 #define ANALOG_BTNS_STD		0x000f0

 #define ANALOG_BTNS_CHF		0x00100
 #define ANALOG_HAT1_CHF		0x00200
 #define ANALOG_HAT2_CHF		0x00400
 #define ANALOG_HAT_FCS		0x00800
 #define ANALOG_HATS_ALL		0x00e00
 #define ANALOG_BTN_TL		0x01000
 #define ANALOG_BTN_TR		0x02000
 #define ANALOG_BTN_TL2		0x04000
 #define ANALOG_BTN_TR2		0x08000
 #define ANALOG_BTNS_TLR		0x03000
 #define ANALOG_BTNS_TLR2	0x0c000
 #define ANALOG_BTNS_GAMEPAD	0x0f000

 #define ANALOG_HBTN_CHF		0x10000
 #define ANALOG_ANY_CHF		0x10700
 #define ANALOG_SAITEK		0x20000
 #define ANALOG_EXTENSIONS	0x7ff00
 #define ANALOG_GAMEPAD		0x80000

 #define ANALOG_MAX_TIME		3	/* 3 ms */
 #define ANALOG_LOOP_TIME	2000	/* 2 * loop */
 #define ANALOG_SAITEK_DELAY	200	/* 200 us */
 #define ANALOG_SAITEK_TIME	2000	/* 2000 us */
 #define ANALOG_AXIS_TIME	2	/* 2 * refresh */
 #define ANALOG_INIT_RETRIES	8	/* 8 times */
 #define ANALOG_FUZZ_BITS	2	/* 2 bit more */
 #define ANALOG_FUZZ_MAGIC	36	/* 36 u*ms/loop */

 #define ANALOG_MAX_NAME_LENGTH  128
 #define ANALOG_MAX_PHYS_LENGTH	32

 static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
 static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
 static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
 static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
 static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
 static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
 				  BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };

 static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };

 struct analog {
 	struct input_dev *dev;
 	int mask;
 	short *buttons;
 	char name[ANALOG_MAX_NAME_LENGTH];
 	char phys[ANALOG_MAX_PHYS_LENGTH];
 };

 struct analog_port {
 	struct gameport *gameport;
 	struct analog analog[2];
 	unsigned char mask;
 	char saitek;
 	char cooked;
 	int bads;
 	int reads;
 	int speed;
 	int loop;
 	int fuzz;
 	int axes[4];
 	int buttons;
 	int initial[4];
 	int axtime;
 };

 /*
  * Time macros.
  */

 #ifdef __i386__

 #include <asm/i8253.h>

 #define GET_TIME(x)	do { if (cpu_has_tsc) rdtscl(x); else x = get_time_pit(); } while (0)
 #define DELTA(x,y)	(cpu_has_tsc ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? CLOCK_TICK_RATE / HZ : 0)))
 #define TIME_NAME	(cpu_has_tsc?"TSC":"PIT")
 static unsigned int get_time_pit(void)
 {
         unsigned long flags;
         unsigned int count;

         spin_lock_irqsave(&i8253_lock, flags);
         outb_p(0x00, 0x43);
         count = inb_p(0x40);
         count |= inb_p(0x40) << 8;
         spin_unlock_irqrestore(&i8253_lock, flags);

         return count;
 }
 #elif defined(__x86_64__)
 #define GET_TIME(x)	rdtscl(x)
 #define DELTA(x,y)	((y)-(x))
 #define TIME_NAME	"TSC"
 #elif defined(__alpha__)
 #define GET_TIME(x)	do { x = get_cycles(); } while (0)
 #define DELTA(x,y)	((y)-(x))
 #define TIME_NAME	"PCC"
 #else
 #define FAKE_TIME
 static unsigned long analog_faketime = 0;
 #define GET_TIME(x)     do { x = analog_faketime++; } while(0)
 #define DELTA(x,y)	((y)-(x))
 #define TIME_NAME	"Unreliable"
 #warning Precise timer not defined for this architecture.
 #endif

 /*
  * analog_decode() decodes analog joystick data and reports input events.
  */

 static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
 {
 	struct input_dev *dev = analog->dev;
 	int i, j;

 	if (analog->mask & ANALOG_HAT_FCS)
 		for (i = 0; i < 4; i++)
 			if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
 				buttons |= 1 << (i + 14);
 				break;
 			}

 	for (i = j = 0; i < 6; i++)
 		if (analog->mask & (0x10 << i))
 			input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);

 	if (analog->mask & ANALOG_HBTN_CHF)
 		for (i = 0; i < 4; i++)
 			input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);

 	if (analog->mask & ANALOG_BTN_TL)
 		input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
 	if (analog->mask & ANALOG_BTN_TR)
 		input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
 	if (analog->mask & ANALOG_BTN_TL2)
 		input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
 	if (analog->mask & ANALOG_BTN_TR2)
 		input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));

 	for (i = j = 0; i < 4; i++)
 		if (analog->mask & (1 << i))
 			input_report_abs(dev, analog_axes[j++], axes[i]);

 	for (i = j = 0; i < 3; i++)
 		if (analog->mask & analog_exts[i]) {
 			input_report_abs(dev, analog_hats[j++],
 				((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
 			input_report_abs(dev, analog_hats[j++],
 				((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
 		}

 	input_sync(dev);
 }

 /*
  * analog_cooked_read() reads analog joystick data.
  */

 static int analog_cooked_read(struct analog_port *port)
 {
 	struct gameport *gameport = port->gameport;
 	unsigned int time[4], start, loop, now, loopout, timeout;
 	unsigned char data[4], this, last;
 	unsigned long flags;
 	int i, j;

 	loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
 	timeout = ANALOG_MAX_TIME * port->speed;

 	local_irq_save(flags);
 	gameport_trigger(gameport);
 	GET_TIME(now);
 	local_irq_restore(flags);

 	start = now;
 	this = port->mask;
 	i = 0;

 	do {
 		loop = now;
 		last = this;

 		local_irq_disable();
 		this = gameport_read(gameport) & port->mask;
 		GET_TIME(now);
 		local_irq_restore(flags);

 		if ((last ^ this) && (DELTA(loop, now) < loopout)) {
 			data[i] = last ^ this;
 			time[i] = now;
 			i++;
 		}

 	} while (this && (i < 4) && (DELTA(start, now) < timeout));

 	this <<= 4;

 	for (--i; i >= 0; i--) {
 		this |= data[i];
 		for (j = 0; j < 4; j++)
 			if (data[i] & (1 << j))
 				port->axes[j] = (DELTA(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
 	}

 	return -(this != port->mask);
 }

 static int analog_button_read(struct analog_port *port, char saitek, char chf)
 {
 	unsigned char u;
 	int t = 1, i = 0;
 	int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);

 	u = gameport_read(port->gameport);

 	if (!chf) {
 		port->buttons = (~u >> 4) & 0xf;
 		return 0;
 	}

 	port->buttons = 0;

 	while ((~u & 0xf0) && (i < 16) && t) {
 		port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
 		if (!saitek) return 0;
 		udelay(ANALOG_SAITEK_DELAY);
 		t = strobe;
 		gameport_trigger(port->gameport);
 		while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
 		i++;
 	}

 	return -(!t || (i == 16));
 }

 /*
  * analog_poll() repeatedly polls the Analog joysticks.
  */

 static void analog_poll(struct gameport *gameport)
 {
 	struct analog_port *port = gameport_get_drvdata(gameport);
 	int i;

 	char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
 	char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);

 	if (port->cooked) {
 		port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
 		if (chf)
 			port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
 		port->reads++;
 	} else {
 		if (!port->axtime--) {
 			port->bads -= analog_cooked_read(port);
 			port->bads -= analog_button_read(port, saitek, chf);
 			port->reads++;
 			port->axtime = ANALOG_AXIS_TIME - 1;
 		} else {
 			if (!saitek)
 				analog_button_read(port, saitek, chf);
 		}
 	}

 	for (i = 0; i < 2; i++)
 		if (port->analog[i].mask)
 			analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
 }

 /*
  * analog_open() is a callback from the input open routine.
  */

 static int analog_open(struct input_dev *dev)
 {
 	struct analog_port *port = dev->private;

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

 /*
  * analog_close() is a callback from the input close routine.
  */

 static void analog_close(struct input_dev *dev)
 {
 	struct analog_port *port = dev->private;

 	gameport_stop_polling(port->gameport);
 }

 /*
  * analog_calibrate_timer() calibrates the timer and computes loop
  * and timeout values for a joystick port.
  */

 static void analog_calibrate_timer(struct analog_port *port)
 {
 	struct gameport *gameport = port->gameport;
 	unsigned int i, t, tx, t1, t2, t3;
 	unsigned long flags;

 	local_irq_save(flags);
 	GET_TIME(t1);
 #ifdef FAKE_TIME
 	analog_faketime += 830;
 #endif
 	mdelay(1);
 	GET_TIME(t2);
 	GET_TIME(t3);
 	local_irq_restore(flags);

 	port->speed = DELTA(t1, t2) - DELTA(t2, t3);

 	tx = ~0;

 	for (i = 0; i < 50; i++) {
 		local_irq_save(flags);
 		GET_TIME(t1);
 		for (t = 0; t < 50; t++) { gameport_read(gameport); GET_TIME(t2); }
 		GET_TIME(t3);
 		local_irq_restore(flags);
 		udelay(i);
 		t = DELTA(t1, t2) - DELTA(t2, t3);
 		if (t < tx) tx = t;
 	}

         port->loop = tx / 50;
 }

 /*
  * analog_name() constructs a name for an analog joystick.
  */

 static void analog_name(struct analog *analog)
 {
 	snprintf(analog->name, sizeof(analog->name), "Analog %d-axis %d-button",
 		 hweight8(analog->mask & ANALOG_AXES_STD),
 		 hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
 		 hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);

 	if (analog->mask & ANALOG_HATS_ALL)
 		snprintf(analog->name, sizeof(analog->name), "%s %d-hat",
 			 analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));

 	if (analog->mask & ANALOG_HAT_FCS)
 		strlcat(analog->name, " FCS", sizeof(analog->name));
 	if (analog->mask & ANALOG_ANY_CHF)
 		strlcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF",
 			sizeof(analog->name));

 	strlcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick",
 		sizeof(analog->name));
 }

 /*
  * analog_init_device()
  */

 static int analog_init_device(struct analog_port *port, struct analog *analog, int index)
 {
 	struct input_dev *input_dev;
 	int i, j, t, v, w, x, y, z;

 	analog_name(analog);
 	snprintf(analog->phys, sizeof(analog->phys),
 		 "%s/input%d", port->gameport->phys, index);
 	analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;

 	analog->dev = input_dev = input_allocate_device();
 	if (!input_dev)
 		return -ENOMEM;

 	input_dev->name = analog->name;
 	input_dev->phys = analog->phys;
 	input_dev->id.bustype = BUS_GAMEPORT;
 	input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
 	input_dev->id.product = analog->mask >> 4;
 	input_dev->id.version = 0x0100;

 	input_dev->open = analog_open;
 	input_dev->close = analog_close;
 	input_dev->private = port;
 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);

 	for (i = j = 0; i < 4; i++)
 		if (analog->mask & (1 << i)) {

 			t = analog_axes[j];
 			x = port->axes[i];
 			y = (port->axes[0] + port->axes[1]) >> 1;
 			z = y - port->axes[i];
 			z = z > 0 ? z : -z;
 			v = (x >> 3);
 			w = (x >> 3);

 			if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
 				x = y;

 			if (analog->mask & ANALOG_SAITEK) {
 				if (i == 2) x = port->axes[i];
 				v = x - (x >> 2);
 				w = (x >> 4);
 			}

 			input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
 			j++;
 		}

 	for (i = j = 0; i < 3; i++)
 		if (analog->mask & analog_exts[i])
 			for (x = 0; x < 2; x++) {
 				t = analog_hats[j++];
 				input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 			}

 	for (i = j = 0; i < 4; i++)
 		if (analog->mask & (0x10 << i))
 			set_bit(analog->buttons[j++], input_dev->keybit);

 	if (analog->mask & ANALOG_BTNS_CHF)
 		for (i = 0; i < 2; i++)
 			set_bit(analog->buttons[j++], input_dev->keybit);

 	if (analog->mask & ANALOG_HBTN_CHF)
 		for (i = 0; i < 4; i++)
 			set_bit(analog->buttons[j++], input_dev->keybit);

 	for (i = 0; i < 4; i++)
 		if (analog->mask & (ANALOG_BTN_TL << i))
 			set_bit(analog_pads[i], input_dev->keybit);

 	analog_decode(analog, port->axes, port->initial, port->buttons);

 	input_register_device(analog->dev);

 	return 0;
 }

 /*
  * analog_init_devices() sets up device-specific values and registers the input devices.
  */

 static int analog_init_masks(struct analog_port *port)
 {
 	int i;
 	struct analog *analog = port->analog;
 	int max[4];

 	if (!port->mask)
 		return -1;

 	if ((port->mask & 3) != 3 && port->mask != 0xc) {
 		printk(KERN_WARNING "analog.c: Unknown joystick device found  "
 			"(data=%#x, %s), probably not analog joystick.\n",
 			port->mask, port->gameport->phys);
 		return -1;
 	}


 	i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */

 	analog[0].mask = i & 0xfffff;

 	analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
 			| port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
 			| ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);

 	analog[0].mask &= ~(ANALOG_HAT2_CHF)
 			| ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);

 	analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
 			| ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
 			| ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
 			| ((~analog[0].mask & ANALOG_HAT_FCS) << 4);

 	analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
 			| (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
 			&  ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));

 	analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);

 	analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
 			: (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);

 	if (port->cooked) {

 		for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;

 		if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
 		if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
 		if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
 		if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
 		if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;

 		gameport_calibrate(port->gameport, port->axes, max);
 	}

 	for (i = 0; i < 4; i++)
 		port->initial[i] = port->axes[i];

 	return -!(analog[0].mask || analog[1].mask);
 }

 static int analog_init_port(struct gameport *gameport, struct gameport_driver *drv, struct analog_port *port)
 {
 	int i, t, u, v;

 	port->gameport = gameport;

 	gameport_set_drvdata(gameport, port);

 	if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {

 		analog_calibrate_timer(port);

 		gameport_trigger(gameport);
 		t = gameport_read(gameport);
 		msleep(ANALOG_MAX_TIME);
 		port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
 		port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;

 		for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
 			if (!analog_cooked_read(port))
 				break;
 			msleep(ANALOG_MAX_TIME);
 		}

 		u = v = 0;

 		msleep(ANALOG_MAX_TIME);
 		t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
 		gameport_trigger(gameport);
 		while ((gameport_read(port->gameport) & port->mask) && (u < t))
 			u++;
 		udelay(ANALOG_SAITEK_DELAY);
 		t = gameport_time(gameport, ANALOG_SAITEK_TIME);
 		gameport_trigger(gameport);
 		while ((gameport_read(port->gameport) & port->mask) && (v < t))
 			v++;

 		if (v < (u >> 1)) { /* FIXME - more than one port */
 			analog_options[0] |= /* FIXME - more than one port */
 				ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
 			return 0;
 		}

 		gameport_close(gameport);
 	}

 	if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {

 		for (i = 0; i < ANALOG_INIT_RETRIES; i++)
 			if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
 				break;
 		for (i = 0; i < 4; i++)
 			if (port->axes[i] != -1)
 				port->mask |= 1 << i;

 		port->fuzz = gameport->fuzz;
 		port->cooked = 1;
 		return 0;
 	}

 	return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 }

 static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)
 {
 	struct analog_port *port;
 	int i;
 	int err;

 	if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
 		return - ENOMEM;

 	err = analog_init_port(gameport, drv, port);
 	if (err)
 		goto fail1;

 	err = analog_init_masks(port);
 	if (err)
 		goto fail2;

 	gameport_set_poll_handler(gameport, analog_poll);
 	gameport_set_poll_interval(gameport, 10);

 	for (i = 0; i < 2; i++)
 		if (port->analog[i].mask) {
 			err = analog_init_device(port, port->analog + i, i);
 			if (err)
 				goto fail3;
 		}

 	return 0;

  fail3: while (--i >= 0)
 		input_unregister_device(port->analog[i].dev);
  fail2:	gameport_close(gameport);
  fail1:	gameport_set_drvdata(gameport, NULL);
 	kfree(port);
 	return err;
 }

 static void analog_disconnect(struct gameport *gameport)
 {
 	struct analog_port *port = gameport_get_drvdata(gameport);
 	int i;

 	for (i = 0; i < 2; i++)
 		if (port->analog[i].mask)
 			input_unregister_device(port->analog[i].dev);
 	gameport_close(gameport);
 	gameport_set_drvdata(gameport, NULL);
 	printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
 		port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
 		port->gameport->phys);
 	kfree(port);
 }

 struct analog_types {
 	char *name;
 	int value;
 };

 static struct analog_types analog_types[] = {
 	{ "none",	0x00000000 },
 	{ "auto",	0x000000ff },
 	{ "2btn",	0x0000003f },
 	{ "y-joy",	0x0cc00033 },
 	{ "y-pad",	0x8cc80033 },
 	{ "fcs",	0x000008f7 },
 	{ "chf",	0x000002ff },
 	{ "fullchf",	0x000007ff },
 	{ "gamepad",	0x000830f3 },
 	{ "gamepad8",	0x0008f0f3 },
 	{ NULL, 0 }
 };

 static void analog_parse_options(void)
 {
 	int i, j;
 	char *end;

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

 		for (j = 0; analog_types[j].name; j++)
 			if (!strcmp(analog_types[j].name, js[i])) {
 				analog_options[i] = analog_types[j].value;
 				break;
 			}
 		if (analog_types[j].name) continue;

 		analog_options[i] = simple_strtoul(js[i], &end, 0);
 		if (end != js[i]) continue;

 		analog_options[i] = 0xff;
 		if (!strlen(js[i])) continue;

 		printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
 	}

 	for (; i < ANALOG_PORTS; i++)
 		analog_options[i] = 0xff;
 }

 /*
  * The gameport device structure.
  */

 static struct gameport_driver analog_drv = {
 	.driver		= {
 		.name	= "analog",
 	},
 	.description	= DRIVER_DESC,
 	.connect	= analog_connect,
 	.disconnect	= analog_disconnect,
 };

 static int __init analog_init(void)
 {
 	analog_parse_options();
 	gameport_register_driver(&analog_drv);

 	return 0;
 }

 static void __exit analog_exit(void)
 {
 	gameport_unregister_driver(&analog_drv);
 }

 module_init(analog_init);
 module_exit(analog_exit);
	/*
	* $Id: analog.c,v 1.68 2002/01/22 20:18:32 vojtech Exp $
	*
	* Copyright (c) 1996-2001 Vojtech Pavlik
	*/

	/*
	* Analog joystick and gamepad 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/module.h>
	#include <linux/moduleparam.h>
	#include <linux/slab.h>
	#include <linux/bitops.h>
	#include <linux/init.h>
	#include <linux/input.h>
	#include <linux/gameport.h>
	#include <linux/jiffies.h>
	#include <asm/timex.h>

	#define DRIVER_DESC "Analog joystick and gamepad driver"

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

	/*
	* Option parsing.
	*/

	#define ANALOG_PORTS 16

	static char *js[ANALOG_PORTS];
	static int js_nargs;
	static int analog_options[ANALOG_PORTS];
	module_param_array_named(map, js, charp, &js_nargs, 0);
	MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");

	__obsolete_setup("js=");

	/*
	* Times, feature definitions.
	*/

	#define ANALOG_RUDDER 0x00004
	#define ANALOG_THROTTLE 0x00008
	#define ANALOG_AXES_STD 0x0000f
	#define ANALOG_BTNS_STD 0x000f0

	#define ANALOG_BTNS_CHF 0x00100
	#define ANALOG_HAT1_CHF 0x00200
	#define ANALOG_HAT2_CHF 0x00400
	#define ANALOG_HAT_FCS 0x00800
	#define ANALOG_HATS_ALL 0x00e00
	#define ANALOG_BTN_TL 0x01000
	#define ANALOG_BTN_TR 0x02000
	#define ANALOG_BTN_TL2 0x04000
	#define ANALOG_BTN_TR2 0x08000
	#define ANALOG_BTNS_TLR 0x03000
	#define ANALOG_BTNS_TLR2 0x0c000
	#define ANALOG_BTNS_GAMEPAD 0x0f000

	#define ANALOG_HBTN_CHF 0x10000
	#define ANALOG_ANY_CHF 0x10700
	#define ANALOG_SAITEK 0x20000
	#define ANALOG_EXTENSIONS 0x7ff00
	#define ANALOG_GAMEPAD 0x80000

	#define ANALOG_MAX_TIME 3 /* 3 ms */
	#define ANALOG_LOOP_TIME 2000 /* 2 * loop */
	#define ANALOG_SAITEK_DELAY 200 /* 200 us */
	#define ANALOG_SAITEK_TIME 2000 /* 2000 us */
	#define ANALOG_AXIS_TIME 2 /* 2 * refresh */
	#define ANALOG_INIT_RETRIES 8 /* 8 times */
	#define ANALOG_FUZZ_BITS 2 /* 2 bit more */
	#define ANALOG_FUZZ_MAGIC 36 /* 36 ums/loop /

	#define ANALOG_MAX_NAME_LENGTH 128
	#define ANALOG_MAX_PHYS_LENGTH 32

	static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
	static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
	static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
	static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
	static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
	static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
	BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };

	static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };

	struct analog {
	struct input_dev *dev;
	int mask;
	short *buttons;
	char name[ANALOG_MAX_NAME_LENGTH];
	char phys[ANALOG_MAX_PHYS_LENGTH];
	};

	struct analog_port {
	struct gameport *gameport;
	struct analog analog[2];
	unsigned char mask;
	char saitek;
	char cooked;
	int bads;
	int reads;
	int speed;
	int loop;
	int fuzz;
	int axes[4];
	int buttons;
	int initial[4];
	int axtime;
	};

	/*
	* Time macros.
	*/

	#ifdef __i386__

	#include <asm/i8253.h>

	#define GET_TIME(x) do { if (cpu_has_tsc) rdtscl(x); else x = get_time_pit(); } while (0)
	#define DELTA(x,y) (cpu_has_tsc ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? CLOCK_TICK_RATE / HZ : 0)))
	#define TIME_NAME (cpu_has_tsc?"TSC":"PIT")
	static unsigned int get_time_pit(void)
	{
	unsigned long flags;
	unsigned int count;

	spin_lock_irqsave(&i8253_lock, flags);
	outb_p(0x00, 0x43);
	count = inb_p(0x40);
	count \|= inb_p(0x40) << 8;
	spin_unlock_irqrestore(&i8253_lock, flags);

	return count;
	}
	#elif defined(__x86_64__)
	#define GET_TIME(x) rdtscl(x)
	#define DELTA(x,y) ((y)-(x))
	#define TIME_NAME "TSC"
	#elif defined(__alpha__)
	#define GET_TIME(x) do { x = get_cycles(); } while (0)
	#define DELTA(x,y) ((y)-(x))
	#define TIME_NAME "PCC"
	#else
	#define FAKE_TIME
	static unsigned long analog_faketime = 0;
	#define GET_TIME(x) do { x = analog_faketime++; } while(0)
	#define DELTA(x,y) ((y)-(x))
	#define TIME_NAME "Unreliable"
	#warning Precise timer not defined for this architecture.
	#endif

	/*
	* analog_decode() decodes analog joystick data and reports input events.
	*/

	static void analog_decode(struct analog analog, int axes, int *initial, int buttons)
	{
	struct input_dev *dev = analog->dev;
	int i, j;

	if (analog->mask & ANALOG_HAT_FCS)
	for (i = 0; i < 4; i++)
	if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
	buttons \|= 1 << (i + 14);
	break;
	}

	for (i = j = 0; i < 6; i++)
	if (analog->mask & (0x10 << i))
	input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);

	if (analog->mask & ANALOG_HBTN_CHF)
	for (i = 0; i < 4; i++)
	input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);

	if (analog->mask & ANALOG_BTN_TL)
	input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
	if (analog->mask & ANALOG_BTN_TR)
	input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
	if (analog->mask & ANALOG_BTN_TL2)
	input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
	if (analog->mask & ANALOG_BTN_TR2)
	input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));

	for (i = j = 0; i < 4; i++)
	if (analog->mask & (1 << i))
	input_report_abs(dev, analog_axes[j++], axes[i]);

	for (i = j = 0; i < 3; i++)
	if (analog->mask & analog_exts[i]) {
	input_report_abs(dev, analog_hats[j++],
	((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
	input_report_abs(dev, analog_hats[j++],
	((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
	}

	input_sync(dev);
	}

	/*
	* analog_cooked_read() reads analog joystick data.
	*/

	static int analog_cooked_read(struct analog_port *port)
	{
	struct gameport *gameport = port->gameport;
	unsigned int time[4], start, loop, now, loopout, timeout;
	unsigned char data[4], this, last;
	unsigned long flags;
	int i, j;

	loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
	timeout = ANALOG_MAX_TIME * port->speed;

	local_irq_save(flags);
	gameport_trigger(gameport);
	GET_TIME(now);
	local_irq_restore(flags);

	start = now;
	this = port->mask;
	i = 0;

	do {
	loop = now;
	last = this;

	local_irq_disable();
	this = gameport_read(gameport) & port->mask;
	GET_TIME(now);
	local_irq_restore(flags);

	if ((last ^ this) && (DELTA(loop, now) < loopout)) {
	data[i] = last ^ this;
	time[i] = now;
	i++;
	}

	} while (this && (i < 4) && (DELTA(start, now) < timeout));

	this <<= 4;

	for (--i; i >= 0; i--) {
	this \|= data[i];
	for (j = 0; j < 4; j++)
	if (data[i] & (1 << j))
	port->axes[j] = (DELTA(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
	}

	return -(this != port->mask);
	}

	static int analog_button_read(struct analog_port *port, char saitek, char chf)
	{
	unsigned char u;
	int t = 1, i = 0;
	int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);

	u = gameport_read(port->gameport);

	if (!chf) {
	port->buttons = (~u >> 4) & 0xf;
	return 0;
	}

	port->buttons = 0;

	while ((~u & 0xf0) && (i < 16) && t) {
	port->buttons \|= 1 << analog_chf[(~u >> 4) & 0xf];
	if (!saitek) return 0;
	udelay(ANALOG_SAITEK_DELAY);
	t = strobe;
	gameport_trigger(port->gameport);
	while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
	i++;
	}

	return -(!t \|\| (i == 16));
	}

	/*
	* analog_poll() repeatedly polls the Analog joysticks.
	*/

	static void analog_poll(struct gameport *gameport)
	{
	struct analog_port *port = gameport_get_drvdata(gameport);
	int i;

	char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
	char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);

	if (port->cooked) {
	port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
	if (chf)
	port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
	port->reads++;
	} else {
	if (!port->axtime--) {
	port->bads -= analog_cooked_read(port);
	port->bads -= analog_button_read(port, saitek, chf);
	port->reads++;
	port->axtime = ANALOG_AXIS_TIME - 1;
	} else {
	if (!saitek)
	analog_button_read(port, saitek, chf);
	}
	}

	for (i = 0; i < 2; i++)
	if (port->analog[i].mask)
	analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
	}

	/*
	* analog_open() is a callback from the input open routine.
	*/

	static int analog_open(struct input_dev *dev)
	{
	struct analog_port *port = dev->private;

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

	/*
	* analog_close() is a callback from the input close routine.
	*/

	static void analog_close(struct input_dev *dev)
	{
	struct analog_port *port = dev->private;

	gameport_stop_polling(port->gameport);
	}

	/*
	* analog_calibrate_timer() calibrates the timer and computes loop
	* and timeout values for a joystick port.
	*/

	static void analog_calibrate_timer(struct analog_port *port)
	{
	struct gameport *gameport = port->gameport;
	unsigned int i, t, tx, t1, t2, t3;
	unsigned long flags;

	local_irq_save(flags);
	GET_TIME(t1);
	#ifdef FAKE_TIME
	analog_faketime += 830;
	#endif
	mdelay(1);
	GET_TIME(t2);
	GET_TIME(t3);
	local_irq_restore(flags);

	port->speed = DELTA(t1, t2) - DELTA(t2, t3);

	tx = ~0;

	for (i = 0; i < 50; i++) {
	local_irq_save(flags);
	GET_TIME(t1);
	for (t = 0; t < 50; t++) { gameport_read(gameport); GET_TIME(t2); }
	GET_TIME(t3);
	local_irq_restore(flags);
	udelay(i);
	t = DELTA(t1, t2) - DELTA(t2, t3);
	if (t < tx) tx = t;
	}

	port->loop = tx / 50;
	}

	/*
	* analog_name() constructs a name for an analog joystick.
	*/

	static void analog_name(struct analog *analog)
	{
	snprintf(analog->name, sizeof(analog->name), "Analog %d-axis %d-button",
	hweight8(analog->mask & ANALOG_AXES_STD),
	hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
	hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);

	if (analog->mask & ANALOG_HATS_ALL)
	snprintf(analog->name, sizeof(analog->name), "%s %d-hat",
	analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));

	if (analog->mask & ANALOG_HAT_FCS)
	strlcat(analog->name, " FCS", sizeof(analog->name));
	if (analog->mask & ANALOG_ANY_CHF)
	strlcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF",
	sizeof(analog->name));

	strlcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick",
	sizeof(analog->name));
	}

	/*
	* analog_init_device()
	*/

	static int analog_init_device(struct analog_port port, struct analog analog, int index)
	{
	struct input_dev *input_dev;
	int i, j, t, v, w, x, y, z;

	analog_name(analog);
	snprintf(analog->phys, sizeof(analog->phys),
	"%s/input%d", port->gameport->phys, index);
	analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;

	analog->dev = input_dev = input_allocate_device();
	if (!input_dev)
	return -ENOMEM;

	input_dev->name = analog->name;
	input_dev->phys = analog->phys;
	input_dev->id.bustype = BUS_GAMEPORT;
	input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
	input_dev->id.product = analog->mask >> 4;
	input_dev->id.version = 0x0100;

	input_dev->open = analog_open;
	input_dev->close = analog_close;
	input_dev->private = port;
	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_ABS);

	for (i = j = 0; i < 4; i++)
	if (analog->mask & (1 << i)) {

	t = analog_axes[j];
	x = port->axes[i];
	y = (port->axes[0] + port->axes[1]) >> 1;
	z = y - port->axes[i];
	z = z > 0 ? z : -z;
	v = (x >> 3);
	w = (x >> 3);

	if ((i == 2 \|\| i == 3) && (j == 2 \|\| j == 3) && (z > (y >> 3)))
	x = y;

	if (analog->mask & ANALOG_SAITEK) {
	if (i == 2) x = port->axes[i];
	v = x - (x >> 2);
	w = (x >> 4);
	}

	input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
	j++;
	}

	for (i = j = 0; i < 3; i++)
	if (analog->mask & analog_exts[i])
	for (x = 0; x < 2; x++) {
	t = analog_hats[j++];
	input_set_abs_params(input_dev, t, -1, 1, 0, 0);
	}

	for (i = j = 0; i < 4; i++)
	if (analog->mask & (0x10 << i))
	set_bit(analog->buttons[j++], input_dev->keybit);

	if (analog->mask & ANALOG_BTNS_CHF)
	for (i = 0; i < 2; i++)
	set_bit(analog->buttons[j++], input_dev->keybit);

	if (analog->mask & ANALOG_HBTN_CHF)
	for (i = 0; i < 4; i++)
	set_bit(analog->buttons[j++], input_dev->keybit);

	for (i = 0; i < 4; i++)
	if (analog->mask & (ANALOG_BTN_TL << i))
	set_bit(analog_pads[i], input_dev->keybit);

	analog_decode(analog, port->axes, port->initial, port->buttons);

	input_register_device(analog->dev);

	return 0;
	}

	/*
	* analog_init_devices() sets up device-specific values and registers the input devices.
	*/

	static int analog_init_masks(struct analog_port *port)
	{
	int i;
	struct analog *analog = port->analog;
	int max[4];

	if (!port->mask)
	return -1;

	if ((port->mask & 3) != 3 && port->mask != 0xc) {
	printk(KERN_WARNING "analog.c: Unknown joystick device found "
	"(data=%#x, %s), probably not analog joystick.\n",
	port->mask, port->gameport->phys);
	return -1;
	}


	i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */

	analog[0].mask = i & 0xfffff;

	analog[0].mask &= ~(ANALOG_AXES_STD \| ANALOG_HAT_FCS \| ANALOG_BTNS_GAMEPAD)
	\| port->mask \| ((port->mask << 8) & ANALOG_HAT_FCS)
	\| ((port->mask << 10) & ANALOG_BTNS_TLR) \| ((port->mask << 12) & ANALOG_BTNS_TLR2);

	analog[0].mask &= ~(ANALOG_HAT2_CHF)
	\| ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);

	analog[0].mask &= ~(ANALOG_THROTTLE \| ANALOG_BTN_TR \| ANALOG_BTN_TR2)
	\| ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
	\| ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
	\| ((~analog[0].mask & ANALOG_HAT_FCS) << 4);

	analog[0].mask &= ~(ANALOG_THROTTLE \| ANALOG_RUDDER)
	\| (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
	& ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));

	analog[1].mask = ((i >> 20) & 0xff) \| ((i >> 12) & 0xf0000);

	analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
	: (((ANALOG_BTNS_STD \| port->mask) & ~analog[0].mask) \| ANALOG_GAMEPAD);

	if (port->cooked) {

	for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;

	if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
	if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
	if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
	if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
	if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;

	gameport_calibrate(port->gameport, port->axes, max);
	}

	for (i = 0; i < 4; i++)
	port->initial[i] = port->axes[i];

	return -!(analog[0].mask \|\| analog[1].mask);
	}

	static int analog_init_port(struct gameport gameport, struct gameport_driver drv, struct analog_port *port)
	{
	int i, t, u, v;

	port->gameport = gameport;

	gameport_set_drvdata(gameport, port);

	if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {

	analog_calibrate_timer(port);

	gameport_trigger(gameport);
	t = gameport_read(gameport);
	msleep(ANALOG_MAX_TIME);
	port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
	port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;

	for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
	if (!analog_cooked_read(port))
	break;
	msleep(ANALOG_MAX_TIME);
	}

	u = v = 0;

	msleep(ANALOG_MAX_TIME);
	t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
	gameport_trigger(gameport);
	while ((gameport_read(port->gameport) & port->mask) && (u < t))
	u++;
	udelay(ANALOG_SAITEK_DELAY);
	t = gameport_time(gameport, ANALOG_SAITEK_TIME);
	gameport_trigger(gameport);
	while ((gameport_read(port->gameport) & port->mask) && (v < t))
	v++;

	if (v < (u >> 1)) { /* FIXME - more than one port */
	analog_options[0] \|= /* FIXME - more than one port */
	ANALOG_SAITEK \| ANALOG_BTNS_CHF \| ANALOG_HBTN_CHF \| ANALOG_HAT1_CHF;
	return 0;
	}

	gameport_close(gameport);
	}

	if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {

	for (i = 0; i < ANALOG_INIT_RETRIES; i++)
	if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
	break;
	for (i = 0; i < 4; i++)
	if (port->axes[i] != -1)
	port->mask \|= 1 << i;

	port->fuzz = gameport->fuzz;
	port->cooked = 1;
	return 0;
	}

	return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
	}

	static int analog_connect(struct gameport gameport, struct gameport_driver drv)
	{
	struct analog_port *port;
	int i;
	int err;

	if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
	return - ENOMEM;

	err = analog_init_port(gameport, drv, port);
	if (err)
	goto fail1;

	err = analog_init_masks(port);
	if (err)
	goto fail2;

	gameport_set_poll_handler(gameport, analog_poll);
	gameport_set_poll_interval(gameport, 10);

	for (i = 0; i < 2; i++)
	if (port->analog[i].mask) {
	err = analog_init_device(port, port->analog + i, i);
	if (err)
	goto fail3;
	}

	return 0;

	fail3: while (--i >= 0)
	input_unregister_device(port->analog[i].dev);
	fail2: gameport_close(gameport);
	fail1: gameport_set_drvdata(gameport, NULL);
	kfree(port);
	return err;
	}

	static void analog_disconnect(struct gameport *gameport)
	{
	struct analog_port *port = gameport_get_drvdata(gameport);
	int i;

	for (i = 0; i < 2; i++)
	if (port->analog[i].mask)
	input_unregister_device(port->analog[i].dev);
	gameport_close(gameport);
	gameport_set_drvdata(gameport, NULL);
	printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
	port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
	port->gameport->phys);
	kfree(port);
	}

	struct analog_types {
	char *name;
	int value;
	};

	static struct analog_types analog_types[] = {
	{ "none", 0x00000000 },
	{ "auto", 0x000000ff },
	{ "2btn", 0x0000003f },
	{ "y-joy", 0x0cc00033 },
	{ "y-pad", 0x8cc80033 },
	{ "fcs", 0x000008f7 },
	{ "chf", 0x000002ff },
	{ "fullchf", 0x000007ff },
	{ "gamepad", 0x000830f3 },
	{ "gamepad8", 0x0008f0f3 },
	{ NULL, 0 }
	};

	static void analog_parse_options(void)
	{
	int i, j;
	char *end;

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

	for (j = 0; analog_types[j].name; j++)
	if (!strcmp(analog_types[j].name, js[i])) {
	analog_options[i] = analog_types[j].value;
	break;
	}
	if (analog_types[j].name) continue;

	analog_options[i] = simple_strtoul(js[i], &end, 0);
	if (end != js[i]) continue;

	analog_options[i] = 0xff;
	if (!strlen(js[i])) continue;

	printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
	}

	for (; i < ANALOG_PORTS; i++)
	analog_options[i] = 0xff;
	}

	/*
	* The gameport device structure.
	*/

	static struct gameport_driver analog_drv = {
	.driver = {
	.name = "analog",
	},
	.description = DRIVER_DESC,
	.connect = analog_connect,
	.disconnect = analog_disconnect,
	};

	static int __init analog_init(void)
	{
	analog_parse_options();
	gameport_register_driver(&analog_drv);

	return 0;
	}

	static void __exit analog_exit(void)
	{
	gameport_unregister_driver(&analog_drv);
	}

	module_init(analog_init);
	module_exit(analog_exit);