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/*
* $Id: lightning.c,v 1.7 2000/05/24 19:36:03 vojtech Exp $
*
* Copyright (c) 1998-2000 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/malloc.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>");
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->driver;
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->driver;
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->driver;
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->driver = l4;
gameport->open = l4_open;
gameport->cooked_read = l4_cooked_read;
gameport->calibrate = l4_calibrate;
gameport->type = GAMEPORT_EXT;
if (!i && !j) {
gameport->io = L4_PORT;
gameport->size = 1;
}
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);
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