/* * $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/config.h>#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 <asm/timex.h>MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");MODULE_DESCRIPTION("Analog joystick and gamepad driver");MODULE_LICENSE("GPL");/* * Option parsing. */#define ANALOG_PORTS		16static char *js[ANALOG_PORTS];static int analog_options[ANALOG_PORTS];MODULE_PARM(js, "1-" __MODULE_STRING(ANALOG_PORTS) "s");MODULE_PARM_DESC(js, "Analog joystick options");/* * 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_REFRESH_TIME	HZ/100	/* 10 ms */#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	32static 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 timer_list timer;	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 used;	int axtime;};/* * Time macros. */#ifdef __i386__#define TSC_PRESENT	(test_bit(X86_FEATURE_TSC, &boot_cpu_data.x86_capability))#define GET_TIME(x)	do { if (TSC_PRESENT) rdtscl(x); else x = get_time_pit(); } while (0)#define DELTA(x,y)	(TSC_PRESENT?((y)-(x)):((x)-(y)+((x)<(y)?1193180L/HZ:0)))#define TIME_NAME	(TSC_PRESENT?"TSC":"PIT")static unsigned int get_time_pit(void){        extern spinlock_t i8253_lock;        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 __x86_64__#define GET_TIME(x)	rdtscl(x)#define DELTA(x,y)	((y)-(x))#define TIME_NAME	"TSC"#elif __alpha__#define GET_TIME(x)	do { x = get_cycles(x); } while (0)#define DELTA(x,y)	((y)-(x))#define TIME_NAME	"PCC"#else#define FAKE_TIMEstatic 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));		}}/* * 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;		__save_flags(flags);	__cli();	gameport_trigger(gameport);	GET_TIME(now);	__restore_flags(flags);	start = now;	this = port->mask;	i = 0;	do {		loop = now;		last = this;		__cli();		this = gameport_read(gameport) & port->mask;		GET_TIME(now);		__restore_flags(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_timer() repeatedly polls the Analog joysticks. */static void analog_timer(unsigned long data){	struct analog_port *port = (void *) data;	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);	mod_timer(&port->timer, jiffies + ANALOG_REFRESH_TIME);}/* * analog_open() is a callback from the input open routine. */static int analog_open(struct input_dev *dev){	struct analog_port *port = dev->private;	if (!port->used++)		mod_timer(&port->timer, jiffies + ANALOG_REFRESH_TIME);		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;	if (!--port->used)		del_timer(&port->timer);}/* * 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;	save_flags(flags);	cli();	GET_TIME(t1);#ifdef FAKE_TIME	analog_faketime += 830;#endif	udelay(1000);	GET_TIME(t2);	GET_TIME(t3);	restore_flags(flags);	port->speed = DELTA(t1, t2) - DELTA(t2, t3);	tx = ~0;	for (i = 0; i < 50; i++) {		save_flags(flags);