1 files changed, 786 insertions, 0 deletions

diff --git a/drivers/input/joystick/analog.c b/drivers/input/joystick/analog.c
new file mode 100644
index 000000000..2b625ebef
--- /dev/null
+++ b/drivers/input/joystick/analog.c
@@ -0,0 +1,786 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (c) 1996-2001 Vojtech Pavlik
+ */
+
+/*
+ * Analog joystick and gamepad driver for Linux
+ */
+
+/*
+ */
+
+#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>
+#include <linux/timekeeping.h>
+
+#define DRIVER_DESC	"Analog joystick and gamepad driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+static bool use_ktime = true;
+module_param(use_ktime, bool, 0400);
+MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed");
+
+/*
+ * 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 (boot_cpu_has(X86_FEATURE_TSC)) x = (unsigned int)rdtsc(); else x = get_time_pit(); } while (0)
+#define DELTA(x,y)	(boot_cpu_has(X86_FEATURE_TSC) ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
+#define TIME_NAME	(boot_cpu_has(X86_FEATURE_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)	do { x = (unsigned int)rdtsc(); } while (0)
+#define DELTA(x,y)	((y)-(x))
+#define TIME_NAME	"TSC"
+#elif defined(__alpha__) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_PPC) || defined(CONFIG_RISCV)
+#define GET_TIME(x)	do { x = get_cycles(); } while (0)
+#define DELTA(x,y)	((y)-(x))
+#define TIME_NAME	"get_cycles"
+#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
+
+static inline u64 get_time(void)
+{
+	if (use_ktime) {
+		return ktime_get_ns();
+	} else {
+		unsigned int x;
+		GET_TIME(x);
+		return x;
+	}
+}
+
+static inline unsigned int delta(u64 x, u64 y)
+{
+	if (use_ktime)
+		return y - x;
+	else
+		return DELTA((unsigned int)x, (unsigned int)y);
+}
+
+/*
+ * 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;
+	u64 time[4], start, loop, now;
+	unsigned int 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);
+	now = get_time();
+	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;
+		now = get_time();
+		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;
+	u64 t1, t2, t3;
+	unsigned long flags;
+
+	if (use_ktime) {
+		port->speed = 1000000;
+	} else {
+		local_irq_save(flags);
+		t1 = get_time();
+#ifdef FAKE_TIME
+		analog_faketime += 830;
+#endif
+		mdelay(1);
+		t2 = get_time();
+		t3 = get_time();
+		local_irq_restore(flags);
+
+		port->speed = delta(t1, t2) - delta(t2, t3);
+	}
+
+	tx = ~0;
+
+	for (i = 0; i < 50; i++) {
+		local_irq_save(flags);
+		t1 = get_time();
+		for (t = 0; t < 50; t++) {
+			gameport_read(gameport);
+			t2 = get_time();
+		}
+		t3 = get_time();
+		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);