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/*

 * $Id: ns558.c,v 1.2 2004-03-29 18:27:42 mauro Exp $

 *

 *  Copyright (c) 1999-2001 Vojtech Pavlik

 *  Copyright (c) 1999 Brian Gerst

 */

/*

 * NS558 based standard IBM game port 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 <linuxcomp.h>

#include <asm/io.h>

#include <linux/module.h>

#include <linux/ioport.h>

#include <linux/config.h>

#include <linux/init.h>

#include <linux/gameport.h>

#include <linux/slab.h>

#include <linux/pnp.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");

MODULE_DESCRIPTION("Classic gameport (ISA/PnP) driver");

MODULE_LICENSE("GPL");

#define NS558_ISA       1

#define NS558_PNP       2

static int ns558_isa_portlist[] = { 0x201, 0x200, 0x202, 0x203, 0x204, 0x205, 0x207, 0x209,

                                    0x20b, 0x20c, 0x20e, 0x20f, 0x211, 0x219, 0x101, 0 };

struct ns558 {

        int type;

        int size;

        struct pnp_dev *dev;

        struct list_head node;

        struct gameport gameport;

        char phys[32];

        char name[32];

};

static LIST_HEAD(ns558_list);

/*

 * ns558_isa_probe() tries to find an isa gameport at the

 * specified address, and also checks for mirrors.

 * A joystick must be attached for this to work.

 */

static void ns558_isa_probe(int io)

{

        int i, j, b;

        unsigned char c, u, v;

        struct ns558 *port;

/*

 * No one should be using this address.

 */

        //!!!if (check_region(io, 1))

        //!!!   return;

/*

 * We must not be able to write arbitrary values to the port.

 * The lower two axis bits must be 1 after a write.

 */

        c = inb(io);

        outb(~c & ~3, io);

        if (~(u = v = inb(io)) & 3) {

                outb(c, io);

                return;

        }

/*

 * After a trigger, there must be at least some bits changing.

 */

        for (i = 0; i < 1000; i++) v &= inb(io);

        if (u == v) {

                outb(c, io);

                return;

        }

        wait_ms(3);

/*

 * After some time (4ms) the axes shouldn't change anymore.

 */

        u = inb(io);

        for (i = 0; i < 1000; i++)

                if ((u ^ inb(io)) & 0xf) {

                        outb(c, io);

                        return;

                }

/*

 * And now find the number of mirrors of the port.

 */

        for (i = 1; i < 5; i++) {

                //!!!if (check_region(io & (-1 << i), (1 << i)))        /* Don't disturb anyone */

                //!!!   break;

                outb(0xff, io & (-1 << i));

                for (j = b = 0; j < 1000; j++)

                        if (inb(io & (-1 << i)) != inb((io & (-1 << i)) + (1 << i) - 1)) b++;

                wait_ms(3);

                if (b > 300)                                    /* We allow 30% difference */

                        break;

        }

        i--;

        if (!(port = kmalloc(sizeof(struct ns558), GFP_KERNEL))) {

                printk(KERN_ERR "ns558: Memory allocation failed.\n");

                return;

        }

        memset(port, 0, sizeof(struct ns558));

        port->type = NS558_ISA;

        port->size = (1 << i);

        port->gameport.io = io;

        port->gameport.phys = port->phys;

        port->gameport.name = port->name;

        port->gameport.id.bustype = BUS_ISA;

        sprintf26(port->phys, "isa%04x/gameport0", io & (-1 << i));

        sprintf26(port->name, "NS558 ISA");

        request_region(io & (-1 << i), (1 << i), "ns558-isa");

        gameport_register_port(&port->gameport);

        printk(KERN_INFO "gameport: NS558 ISA at %#x", port->gameport.io);

        if (port->size > 1) printk(" size %d", port->size);

        printk(" speed %d kHz\n", port->gameport.speed);

        list_add(&port->node, &ns558_list);

}

#ifdef CONFIG_PNP

static struct pnp_device_id pnp_devids[] = {

        { .id = "@P@0001", .driver_data = 0 }, /* ALS 100 */

        { .id = "@P@0020", .driver_data = 0 }, /* ALS 200 */

        { .id = "@P@1001", .driver_data = 0 }, /* ALS 100+ */

        { .id = "@P@2001", .driver_data = 0 }, /* ALS 120 */

        { .id = "ASB16fd", .driver_data = 0 }, /* AdLib NSC16 */

        { .id = "AZT3001", .driver_data = 0 }, /* AZT1008 */

        { .id = "CDC0001", .driver_data = 0 }, /* Opl3-SAx */

        { .id = "CSC0001", .driver_data = 0 }, /* CS4232 */

        { .id = "CSC000f", .driver_data = 0 }, /* CS4236 */

        { .id = "CSC0101", .driver_data = 0 }, /* CS4327 */

        { .id = "CTL7001", .driver_data = 0 }, /* SB16 */

        { .id = "CTL7002", .driver_data = 0 }, /* AWE64 */

        { .id = "CTL7005", .driver_data = 0 }, /* Vibra16 */

        { .id = "ENS2020", .driver_data = 0 }, /* SoundscapeVIVO */

        { .id = "ESS0001", .driver_data = 0 }, /* ES1869 */

        { .id = "ESS0005", .driver_data = 0 }, /* ES1878 */

        { .id = "ESS6880", .driver_data = 0 }, /* ES688 */

        { .id = "IBM0012", .driver_data = 0 }, /* CS4232 */

        { .id = "OPT0001", .driver_data = 0 }, /* OPTi Audio16 */

        { .id = "YMH0006", .driver_data = 0 }, /* Opl3-SA */

        { .id = "YMH0022", .driver_data = 0 }, /* Opl3-SAx */

        { .id = "PNPb02f", .driver_data = 0 }, /* Generic */

        { .id = "", },

};

MODULE_DEVICE_TABLE(pnp, pnp_devids);

static int ns558_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *did)

{

        int ioport, iolen;

        struct ns558 *port;

        if (!pnp_port_valid(dev, 0)) {

                printk(KERN_WARNING "ns558: No i/o ports on a gameport? Weird\n");

                return -ENODEV;

        }

        ioport = pnp_port_start(dev,0);

        iolen = pnp_port_len(dev,0);

        if (!request_region(ioport, iolen, "ns558-pnp"))

                return -EBUSY;

        if (!(port = kmalloc(sizeof(struct ns558), GFP_KERNEL))) {

                printk(KERN_ERR "ns558: Memory allocation failed.\n");

                return -ENOMEM;

        }

        memset(port, 0, sizeof(struct ns558));

        port->type = NS558_PNP;

        port->size = iolen;

        port->dev = dev;

        port->gameport.io = ioport;

        port->gameport.phys = port->phys;

        port->gameport.name = port->name;

        port->gameport.id.bustype = BUS_ISAPNP;

        port->gameport.id.version = 0x100;

        sprintf26(port->phys, "pnp%s/gameport0", dev->dev.bus_id);

        sprintf26(port->name, "%s", "NS558 PnP Gameport");

        gameport_register_port(&port->gameport);

        printk(KERN_INFO "gameport: NS558 PnP at pnp%s io %#x",

                dev->dev.bus_id, port->gameport.io);

        if (iolen > 1) printk(" size %d", iolen);

        printk(" speed %d kHz\n", port->gameport.speed);

        list_add_tail(&port->node, &ns558_list);

        return 0;

}

static struct pnp_driver ns558_pnp_driver = {

        .name           = "ns558",

        .id_table       = pnp_devids,

        .probe          = ns558_pnp_probe,

};

#else

static struct pnp_driver ns558_pnp_driver;

#endif

int __init ns558_init(void)

{

        int i = 0;

/*

 * Probe for ISA ports.

 */

        while (ns558_isa_portlist[i])

                ns558_isa_probe(ns558_isa_portlist[i++]);

        pnp_register_driver(&ns558_pnp_driver);

        return list_empty(&ns558_list) ? -ENODEV : 0;

}

void __exit ns558_exit(void)

{

        struct ns558 *port;

        list_for_each_entry(port, &ns558_list, node) {

                gameport_unregister_port(&port->gameport);

                switch (port->type) {

#ifdef CONFIG_PNP

                        case NS558_PNP:

                                /* fall through */

#endif

                        case NS558_ISA:

                                release_region(port->gameport.io & ~(port->size - 1), port->size);

                                break;

                        default:

                                break;

                }

        }

        pnp_unregister_driver(&ns558_pnp_driver);

}

module_init(ns558_init);

module_exit(ns558_exit);