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|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 1998-2001 Vojtech Pavlik
*/
/*
* PDPI Lightning 4 gamecard driver for Linux.
*/
/*
*/
#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>
#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@ucw.cz>");
MODULE_DESCRIPTION("PDPI Lightning 4 gamecard driver");
MODULE_LICENSE("GPL");
struct l4 {
struct gameport *gameport;
unsigned char port;
};
static struct l4 l4_ports[8];
/*
* l4_wait_ready() waits for the L4 to become ready.
*/
static int l4_wait_ready(void)
{
unsigned int 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->port_data;
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->port_data;
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 out;
outb(L4_CMD_GETCAL, L4_PORT);
if (l4_wait_ready())
goto out;
if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
goto out;
if (l4_wait_ready())
goto out;
outb(port & 3, L4_PORT);
for (i = 0; i < 4; i++) {
if (l4_wait_ready())
goto out;
cal[i] = inb(L4_PORT);
}
result = 0;
out: 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 out;
outb(L4_CMD_SETCAL, L4_PORT);
if (l4_wait_ready())
goto out;
if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
goto out;
if (l4_wait_ready())
goto out;
outb(port & 3, L4_PORT);
for (i = 0; i < 4; i++) {
if (l4_wait_ready())
goto out;
outb(cal[i], L4_PORT);
}
result = 0;
out: 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->port_data;
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;
}
static int __init l4_create_ports(int card_no)
{
struct l4 *l4;
struct gameport *port;
int i, idx;
for (i = 0; i < 4; i++) {
idx = card_no * 4 + i;
l4 = &l4_ports[idx];
if (!(l4->gameport = port = gameport_allocate_port())) {
printk(KERN_ERR "lightning: Memory allocation failed\n");
while (--i >= 0) {
gameport_free_port(l4->gameport);
l4->gameport = NULL;
}
return -ENOMEM;
}
l4->port = idx;
port->port_data = l4;
port->open = l4_open;
port->cooked_read = l4_cooked_read;
port->calibrate = l4_calibrate;
gameport_set_name(port, "PDPI Lightning 4");
gameport_set_phys(port, "isa%04x/gameport%d", L4_PORT, idx);
if (idx == 0)
port->io = L4_PORT;
}
return 0;
}
static int __init l4_add_card(int card_no)
{
int cal[4] = { 255, 255, 255, 255 };
int i, rev, result;
struct l4 *l4;
outb(L4_SELECT_ANALOG, L4_PORT);
outb(L4_SELECT_DIGITAL + card_no, L4_PORT);
if (inb(L4_PORT) & L4_BUSY)
return -1;
outb(L4_CMD_ID, L4_PORT);
if (l4_wait_ready())
return -1;
if (inb(L4_PORT) != L4_SELECT_DIGITAL + card_no)
return -1;
if (l4_wait_ready())
return -1;
if (inb(L4_PORT) != L4_ID)
return -1;
if (l4_wait_ready())
return -1;
rev = inb(L4_PORT);
if (!rev)
return -1;
result = l4_create_ports(card_no);
if (result)
return result;
printk(KERN_INFO "gameport: PDPI Lightning 4 %s card v%d.%d at %#x\n",
card_no ? "secondary" : "primary", rev >> 4, rev, L4_PORT);
for (i = 0; i < 4; i++) {
l4 = &l4_ports[card_no * 4 + i];
if (rev > 0x28) /* on 2.9+ the setcal command works correctly */
l4_setcal(l4->port, cal);
gameport_register_port(l4->gameport);
}
return 0;
}
static int __init l4_init(void)
{
int i, cards = 0;
if (!request_region(L4_PORT, 1, "lightning"))
return -EBUSY;
for (i = 0; i < 2; i++)
if (l4_add_card(i) == 0)
cards++;
outb(L4_SELECT_ANALOG, L4_PORT);
if (!cards) {
release_region(L4_PORT, 1);
return -ENODEV;
}
return 0;
}
static void __exit l4_exit(void)
{
int i;
int cal[4] = { 59, 59, 59, 59 };
for (i = 0; i < 8; i++)
if (l4_ports[i].gameport) {
l4_setcal(l4_ports[i].port, cal);
gameport_unregister_port(l4_ports[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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