326 lines
6.0 KiB
C
326 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 1998-2001 Vojtech Pavlik
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*/
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/*
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* PDPI Lightning 4 gamecard driver for Linux.
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*/
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/*
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*/
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#include <asm/io.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gameport.h>
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#define L4_PORT 0x201
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#define L4_SELECT_ANALOG 0xa4
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#define L4_SELECT_DIGITAL 0xa5
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#define L4_SELECT_SECONDARY 0xa6
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#define L4_CMD_ID 0x80
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#define L4_CMD_GETCAL 0x92
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#define L4_CMD_SETCAL 0x93
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#define L4_ID 0x04
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#define L4_BUSY 0x01
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#define L4_TIMEOUT 80 /* 80 us */
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("PDPI Lightning 4 gamecard driver");
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MODULE_LICENSE("GPL");
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struct l4 {
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struct gameport *gameport;
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unsigned char port;
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};
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static struct l4 l4_ports[8];
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/*
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* l4_wait_ready() waits for the L4 to become ready.
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*/
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static int l4_wait_ready(void)
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{
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unsigned int t = L4_TIMEOUT;
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while ((inb(L4_PORT) & L4_BUSY) && t > 0) t--;
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return -(t <= 0);
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}
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/*
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* l4_cooked_read() reads data from the Lightning 4.
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*/
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static int l4_cooked_read(struct gameport *gameport, int *axes, int *buttons)
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{
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struct l4 *l4 = gameport->port_data;
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unsigned char status;
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int i, result = -1;
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outb(L4_SELECT_ANALOG, L4_PORT);
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outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT);
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if (inb(L4_PORT) & L4_BUSY) goto fail;
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outb(l4->port & 3, L4_PORT);
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if (l4_wait_ready()) goto fail;
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status = inb(L4_PORT);
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for (i = 0; i < 4; i++)
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if (status & (1 << i)) {
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if (l4_wait_ready()) goto fail;
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axes[i] = inb(L4_PORT);
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if (axes[i] > 252) axes[i] = -1;
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}
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if (status & 0x10) {
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if (l4_wait_ready()) goto fail;
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*buttons = inb(L4_PORT) & 0x0f;
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}
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result = 0;
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fail: outb(L4_SELECT_ANALOG, L4_PORT);
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return result;
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}
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static int l4_open(struct gameport *gameport, int mode)
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{
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struct l4 *l4 = gameport->port_data;
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if (l4->port != 0 && mode != GAMEPORT_MODE_COOKED)
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return -1;
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outb(L4_SELECT_ANALOG, L4_PORT);
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return 0;
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}
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/*
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* l4_getcal() reads the L4 with calibration values.
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*/
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static int l4_getcal(int port, int *cal)
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{
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int i, result = -1;
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outb(L4_SELECT_ANALOG, L4_PORT);
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outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
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if (inb(L4_PORT) & L4_BUSY)
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goto out;
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outb(L4_CMD_GETCAL, L4_PORT);
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if (l4_wait_ready())
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goto out;
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if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
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goto out;
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if (l4_wait_ready())
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goto out;
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outb(port & 3, L4_PORT);
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for (i = 0; i < 4; i++) {
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if (l4_wait_ready())
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goto out;
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cal[i] = inb(L4_PORT);
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}
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result = 0;
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out: outb(L4_SELECT_ANALOG, L4_PORT);
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return result;
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}
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/*
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* l4_setcal() programs the L4 with calibration values.
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*/
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static int l4_setcal(int port, int *cal)
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{
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int i, result = -1;
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outb(L4_SELECT_ANALOG, L4_PORT);
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outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
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if (inb(L4_PORT) & L4_BUSY)
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goto out;
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outb(L4_CMD_SETCAL, L4_PORT);
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if (l4_wait_ready())
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goto out;
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if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
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goto out;
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if (l4_wait_ready())
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goto out;
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outb(port & 3, L4_PORT);
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for (i = 0; i < 4; i++) {
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if (l4_wait_ready())
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goto out;
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outb(cal[i], L4_PORT);
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}
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result = 0;
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out: outb(L4_SELECT_ANALOG, L4_PORT);
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return result;
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}
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/*
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* l4_calibrate() calibrates the L4 for the attached device, so
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* that the device's resistance fits into the L4's 8-bit range.
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*/
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static int l4_calibrate(struct gameport *gameport, int *axes, int *max)
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{
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int i, t;
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int cal[4];
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struct l4 *l4 = gameport->port_data;
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if (l4_getcal(l4->port, cal))
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return -1;
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for (i = 0; i < 4; i++) {
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t = (max[i] * cal[i]) / 200;
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t = (t < 1) ? 1 : ((t > 255) ? 255 : t);
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axes[i] = (axes[i] < 0) ? -1 : (axes[i] * cal[i]) / t;
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axes[i] = (axes[i] > 252) ? 252 : axes[i];
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cal[i] = t;
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}
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if (l4_setcal(l4->port, cal))
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return -1;
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return 0;
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}
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static int __init l4_create_ports(int card_no)
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{
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struct l4 *l4;
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struct gameport *port;
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int i, idx;
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for (i = 0; i < 4; i++) {
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idx = card_no * 4 + i;
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l4 = &l4_ports[idx];
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if (!(l4->gameport = port = gameport_allocate_port())) {
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printk(KERN_ERR "lightning: Memory allocation failed\n");
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while (--i >= 0) {
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gameport_free_port(l4->gameport);
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l4->gameport = NULL;
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}
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return -ENOMEM;
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}
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l4->port = idx;
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port->port_data = l4;
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port->open = l4_open;
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port->cooked_read = l4_cooked_read;
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port->calibrate = l4_calibrate;
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gameport_set_name(port, "PDPI Lightning 4");
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gameport_set_phys(port, "isa%04x/gameport%d", L4_PORT, idx);
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if (idx == 0)
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port->io = L4_PORT;
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}
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return 0;
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}
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static int __init l4_add_card(int card_no)
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{
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int cal[4] = { 255, 255, 255, 255 };
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int i, rev, result;
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struct l4 *l4;
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outb(L4_SELECT_ANALOG, L4_PORT);
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outb(L4_SELECT_DIGITAL + card_no, L4_PORT);
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if (inb(L4_PORT) & L4_BUSY)
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return -1;
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outb(L4_CMD_ID, L4_PORT);
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if (l4_wait_ready())
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return -1;
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if (inb(L4_PORT) != L4_SELECT_DIGITAL + card_no)
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return -1;
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if (l4_wait_ready())
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return -1;
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if (inb(L4_PORT) != L4_ID)
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return -1;
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if (l4_wait_ready())
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return -1;
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rev = inb(L4_PORT);
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if (!rev)
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return -1;
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result = l4_create_ports(card_no);
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if (result)
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return result;
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printk(KERN_INFO "gameport: PDPI Lightning 4 %s card v%d.%d at %#x\n",
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card_no ? "secondary" : "primary", rev >> 4, rev, L4_PORT);
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for (i = 0; i < 4; i++) {
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l4 = &l4_ports[card_no * 4 + i];
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if (rev > 0x28) /* on 2.9+ the setcal command works correctly */
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l4_setcal(l4->port, cal);
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gameport_register_port(l4->gameport);
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}
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return 0;
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}
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static int __init l4_init(void)
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{
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int i, cards = 0;
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if (!request_region(L4_PORT, 1, "lightning"))
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return -EBUSY;
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for (i = 0; i < 2; i++)
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if (l4_add_card(i) == 0)
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cards++;
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outb(L4_SELECT_ANALOG, L4_PORT);
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if (!cards) {
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release_region(L4_PORT, 1);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit l4_exit(void)
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{
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int i;
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int cal[4] = { 59, 59, 59, 59 };
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for (i = 0; i < 8; i++)
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if (l4_ports[i].gameport) {
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l4_setcal(l4_ports[i].port, cal);
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gameport_unregister_port(l4_ports[i].gameport);
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}
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outb(L4_SELECT_ANALOG, L4_PORT);
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release_region(L4_PORT, 1);
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}
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module_init(l4_init);
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module_exit(l4_exit);
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