fm801-gp.c

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/*
 *  FM801 gameport driver for Linux
 *
 *  Copyright (c) by Takashi Iwai <[email protected]>
 *
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#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/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/gameport.h>

#define PCI_VENDOR_ID_FORTEMEDIA    0x1319
#define PCI_DEVICE_ID_FM801_GP  0x0802

#define HAVE_COOKED

struct fm801_gp {
    struct gameport *gameport;
    struct resource *res_port;
};

#ifdef HAVE_COOKED
static int fm801_gp_cooked_read(struct gameport *gameport, int *axes, int *buttons)
{
    unsigned short w;

    w = inw(gameport->io + 2);
    *buttons = (~w >> 14) & 0x03;
    axes[0] = (w == 0xffff) ? -1 : ((w & 0x1fff) << 5);
    w = inw(gameport->io + 4);
    axes[1] = (w == 0xffff) ? -1 : ((w & 0x1fff) << 5);
    w = inw(gameport->io + 6);
    *buttons |= ((~w >> 14) & 0x03) << 2;
    axes[2] = (w == 0xffff) ? -1 : ((w & 0x1fff) << 5);
    w = inw(gameport->io + 8);
    axes[3] = (w == 0xffff) ? -1 : ((w & 0x1fff) << 5);
    outw(0xff, gameport->io); /* reset */

        return 0;
}
#endif

static int fm801_gp_open(struct gameport *gameport, int mode)
{
    switch (mode) {
#ifdef HAVE_COOKED
    case GAMEPORT_MODE_COOKED:
        return 0;
#endif
    case GAMEPORT_MODE_RAW:
        return 0;
    default:
        return -1;
    }

    return 0;
}

static int __devinit fm801_gp_probe(struct pci_dev *pci, const struct pci_device_id *id)
{
    struct fm801_gp *gp;
    struct gameport *port;
    int error;

    gp = kzalloc(sizeof(struct fm801_gp), GFP_KERNEL);
    port = gameport_allocate_port();
    if (!gp || !port) {
        printk(KERN_ERR "fm801-gp: Memory allocation failed\n");
        error = -ENOMEM;
        goto err_out_free;
    }

    error = pci_enable_device(pci);
    if (error)
        goto err_out_free;

    port->open = fm801_gp_open;
#ifdef HAVE_COOKED
    port->cooked_read = fm801_gp_cooked_read;
#endif
    gameport_set_name(port, "FM801");
    gameport_set_phys(port, "pci%s/gameport0", pci_name(pci));
    port->dev.parent = &pci->dev;
    port->io = pci_resource_start(pci, 0);

    gp->gameport = port;
    gp->res_port = request_region(port->io, 0x10, "FM801 GP");
    if (!gp->res_port) {
        printk(KERN_DEBUG "fm801-gp: unable to grab region 0x%x-0x%x\n",
            port->io, port->io + 0x0f);
        error = -EBUSY;
        goto err_out_disable_dev;
    }

    pci_set_drvdata(pci, gp);

    outb(0x60, port->io + 0x0d); /* enable joystick 1 and 2 */
    gameport_register_port(port);

    return 0;

 err_out_disable_dev:
    pci_disable_device(pci);
 err_out_free:
    gameport_free_port(port);
    kfree(gp);
    return error;
}

static void __devexit fm801_gp_remove(struct pci_dev *pci)
{
    struct fm801_gp *gp = pci_get_drvdata(pci);

    gameport_unregister_port(gp->gameport);
    release_resource(gp->res_port);
    kfree(gp);

    pci_disable_device(pci);
}

static const struct pci_device_id fm801_gp_id_table[] = {
    { PCI_VENDOR_ID_FORTEMEDIA, PCI_DEVICE_ID_FM801_GP, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0  },
    { 0 }
};
MODULE_DEVICE_TABLE(pci, fm801_gp_id_table);

static struct pci_driver fm801_gp_driver = {
    .name =     "FM801_gameport",
    .id_table = fm801_gp_id_table,
    .probe =    fm801_gp_probe,
    .remove =   __devexit_p(fm801_gp_remove),
};

module_pci_driver(fm801_gp_driver);

MODULE_DESCRIPTION("FM801 gameport driver");
MODULE_AUTHOR("Takashi Iwai <[email protected]>");
MODULE_LICENSE("GPL");