/* * $Id: lightning.c,v 1.13 2001/04/26 10:24:46 vojtech Exp $ * *  Copyright (c) 1998-2001 Vojtech Pavlik * *  Sponsored by SuSE *//* * PDPI Lightning 4 gamecard 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@suse.cz>, or by paper mail: * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic */#include <asm/io.h>#include <linux/delay.h>#include <linux/errno.h>#include <linux/ioport.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/gameport.h>#include <linux/slab.h>#define L4_PORT			0x201#define L4_SELECT_ANALOG	0xa4#define L4_SELECT_DIGITAL	0xa5#define L4_SELECT_SECONDARY	0xa6#define L4_CMD_ID		0x80#define L4_CMD_GETCAL		0x92#define L4_CMD_SETCAL		0x93#define L4_ID			0x04#define L4_BUSY			0x01#define L4_TIMEOUT		80	/* 80 us */MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");MODULE_LICENSE("GPL");struct l4 {	struct gameport gameport;	unsigned char port;} *l4_port[8];/* * l4_wait_ready() waits for the L4 to become ready. */static int l4_wait_ready(void){	unsigned int t;	t = L4_TIMEOUT;	while ((inb(L4_PORT) & L4_BUSY) && t > 0) t--;	return -(t<=0);}/* * l4_cooked_read() reads data from the Lightning 4. */static int l4_cooked_read(struct gameport *gameport, int *axes, int *buttons){	struct l4 *l4 = gameport->private;	unsigned char status;	int i, result = -1;	outb(L4_SELECT_ANALOG, L4_PORT);	outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT);	if (inb(L4_PORT) & L4_BUSY) goto fail;	outb(l4->port & 3, L4_PORT);	if (l4_wait_ready()) goto fail;	status = inb(L4_PORT);	for (i = 0; i < 4; i++)		if (status & (1 << i)) {			if (l4_wait_ready()) goto fail;			axes[i] = inb(L4_PORT);			if (axes[i] > 252) axes[i] = -1;		}	if (status & 0x10) {		if (l4_wait_ready()) goto fail;		*buttons = inb(L4_PORT) & 0x0f;	}	result = 0;fail:	outb(L4_SELECT_ANALOG, L4_PORT);		return result;}static int l4_open(struct gameport *gameport, int mode){	struct l4 *l4 = gameport->private;        if (l4->port != 0 && mode != GAMEPORT_MODE_COOKED)		return -1;	outb(L4_SELECT_ANALOG, L4_PORT);	return 0;}/* * l4_getcal() reads the L4 with calibration values. */static int l4_getcal(int port, int *cal){	int i, result = -1;		outb(L4_SELECT_ANALOG, L4_PORT);	outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);	if (inb(L4_PORT) & L4_BUSY) goto fail;	outb(L4_CMD_GETCAL, L4_PORT);	if (l4_wait_ready()) goto fail;	if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) goto fail;	if (l4_wait_ready()) goto fail;        outb(port & 3, L4_PORT);	for (i = 0; i < 4; i++) {		if (l4_wait_ready()) goto fail;		cal[i] = inb(L4_PORT);	}	result = 0;fail:	outb(L4_SELECT_ANALOG, L4_PORT);	return result;}/* * l4_setcal() programs the L4 with calibration values. */static int l4_setcal(int port, int *cal){	int i, result = -1;	outb(L4_SELECT_ANALOG, L4_PORT);	outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);	if (inb(L4_PORT) & L4_BUSY) goto fail;	outb(L4_CMD_SETCAL, L4_PORT);	if (l4_wait_ready()) goto fail;	if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) goto fail;	if (l4_wait_ready()) goto fail;        outb(port & 3, L4_PORT);	for (i = 0; i < 4; i++) {		if (l4_wait_ready()) goto fail;		outb(cal[i], L4_PORT);	}	result = 0;fail:	outb(L4_SELECT_ANALOG, L4_PORT);	return result;}/* * l4_calibrate() calibrates the L4 for the attached device, so * that the device's resistance fits into the L4's 8-bit range. */static int l4_calibrate(struct gameport *gameport, int *axes, int *max){	int i, t;	int cal[4];	struct l4 *l4 = gameport->private;	if (l4_getcal(l4->port, cal))		return -1;	for (i = 0; i < 4; i++) {		t = (max[i] * cal[i]) / 200;		t = (t < 1) ? 1 : ((t > 255) ? 255 : t);		axes[i] = (axes[i] < 0) ? -1 : (axes[i] * cal[i]) / t;		axes[i] = (axes[i] > 252) ? 252 : axes[i];		cal[i] = t;	}	if (l4_setcal(l4->port, cal))		return -1;	return 0;}	int __init l4_init(void){	int cal[4] = {255,255,255,255};	int i, j, rev, cards = 0;	struct gameport *gameport;	struct l4 *l4;	if (!request_region(L4_PORT, 1, "lightning"))		return -1;	for (i = 0; i < 2; i++) {		outb(L4_SELECT_ANALOG, L4_PORT);		outb(L4_SELECT_DIGITAL + i, L4_PORT);		if (inb(L4_PORT) & L4_BUSY) continue;		outb(L4_CMD_ID, L4_PORT);		if (l4_wait_ready()) continue;		if (inb(L4_PORT) != L4_SELECT_DIGITAL + i) continue;		if (l4_wait_ready()) continue;		if (inb(L4_PORT) != L4_ID) continue;		if (l4_wait_ready()) continue;		rev = inb(L4_PORT);		if (!rev) continue;		if (!(l4_port[i * 4] = kmalloc(sizeof(struct l4) * 4, GFP_KERNEL))) {			printk(KERN_ERR "lightning: Out of memory allocating ports.\n");			continue;		}		memset(l4_port[i * 4], 0, sizeof(struct l4) * 4);		for (j = 0; j < 4; j++) {			l4 = l4_port[i * 4 + j] = l4_port[i * 4] + j;			l4->port = i * 4 + j;			gameport = &l4->gameport;			gameport->private = l4;			gameport->open = l4_open;			gameport->cooked_read = l4_cooked_read;			gameport->calibrate = l4_calibrate;			if (!i && !j)				gameport->io = L4_PORT;			if (rev > 0x28)		/* on 2.9+ the setcal command works correctly */				l4_setcal(l4->port, cal);						gameport_register_port(gameport);		}		printk(KERN_INFO "gameport%d,%d,%d,%d: PDPI Lightning 4 %s card v%d.%d at %#x\n",			l4_port[i * 4 + 0]->gameport.number, l4_port[i * 4 + 1]->gameport.number, 			l4_port[i * 4 + 2]->gameport.number, l4_port[i * 4 + 3]->gameport.number, 			i ? "secondary" : "primary", rev >> 4, rev, L4_PORT);		cards++;	}	outb(L4_SELECT_ANALOG, L4_PORT);	if (!cards) {		release_region(L4_PORT, 1);		return -1;	}	return 0;}void __init l4_exit(void){	int i;	int cal[4] = {59, 59, 59, 59};	for (i = 0; i < 8; i++)		if (l4_port[i]) {			l4_setcal(l4_port[i]->port, cal);			gameport_unregister_port(&l4_port[i]->gameport);		}	outb(L4_SELECT_ANALOG, L4_PORT);	release_region(L4_PORT, 1);}module_init(l4_init);module_exit(l4_exit);