text: /*
   *  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/slab.h>
  #include <linux/bitops.h>
  #include <linux/init.h>
  #include <linux/input.h>
  #include <linux/gameport.h>
  #include <linux/jiffies.h>
  #include <linux/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 unsigned 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");
  
  /*
   * 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 <linux/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) ? PIT_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;
  
          raw_spin_lock_irqsave(&i8253_lock, flags);
          outb_p(0x00, 0x43);
          count = inb_p(0x40);
          count |= inb_p(0x40) << 8;
          raw_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"
  #elif defined(CONFIG_MN10300)
  #define GET_TIME(x)	do { x = get_cycles(); } while (0)
  #define DELTA(x, y)	((x) - (y))
  #define TIME_NAME	"TSC"
  #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 = input_get_drvdata(dev);
  
  	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 = input_get_drvdata(dev);
  
  	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;
  	int error;
  
  	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->dev.parent = &port->gameport->dev;
  
  	input_set_drvdata(input_dev, port);
  
  	input_dev->open = analog_open;
  	input_dev->close = analog_close;
  
  	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(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);
  
  	error = input_register_device(analog->dev);
  	if (error) {
  		input_free_device(analog->dev);
  		return error;
  	}
  
  	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)
  		if (port->analog[i].mask)
  			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();
  	return gameport_register_driver(&analog_drv);
  }
  
  static void __exit analog_exit(void)
  {
  	gameport_unregister_driver(&analog_drv);
  }
  
  module_init(analog_init);
  module_exit(analog_exit);
  