analog.c

优龙2410linux2.6.8内核源代码

/*
 * $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 <[e-mail]>, 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/moduleparam.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 <[e-mail]>");
MODULE_DESCRIPTION("Analog joystick and gamepad driver");
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_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	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 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 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)
{
        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 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_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;

	local_irq_save(flags);
	GET_TIME(t1);
#ifdef FAKE_TIME
	analog_faketime += 830;
#endif
	udelay(1000);