--- /dev/null
+/*
+ * Copyright (c) 1998-2001 Vojtech Pavlik
+ */
+
+/*
+ * 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@ucw.cz>, or by paper mail:
+ * Vojtech Pavlik, Simunkova 1594, 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>
+
+#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);
Code Review / kvmfornfv.git / blobdiff