pcigame.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*
 * $Id: pcigame.c,v 1.10 2001/04/26 10:24:46 vojtech Exp $
 *
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *	Raymond Ingles
 *
 *  Sponsored by SuSE
 */

/*
 * Trident 4DWave and Aureal Vortex gameport 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 <[e-mail]>, or by paper mail:
 * Vojtech Pavlik, Ucitelska 1576, 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/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/pci_gameport.h>

#define PCI_VENDOR_ID_AUREAL	0x12eb

#define PCIGAME_DATA_WAIT	20	/* 20 ms */


static struct pcigame_data pcigame_data[] __devinitdata = {
	{ 0x00030, 0x00031, 0x00034, 2, 0xffff, 0x80 },
	{ 0x1100c, 0x11008, 0x11010, 4, 0x1fff, 0x40 },
	{ 0x2880c, 0x28808, 0x28810, 4, 0x1fff, 0x40 },
	{ 0 }
};

static unsigned char pcigame_read(struct gameport *gameport)
{
	struct pcigame *pcigame = gameport->driver;
	return readb(pcigame->base + pcigame->data->legacy);
}

static void pcigame_trigger(struct gameport *gameport)
{
	struct pcigame *pcigame = gameport->driver;
	writeb(0xff, pcigame->base + pcigame->data->legacy);
}

static int pcigame_cooked_read(struct gameport *gameport, int *axes, int *buttons)
{
        struct pcigame *pcigame = gameport->driver;
	int i;

	*buttons = (~readb(pcigame->base + pcigame->data->legacy) >> 4) & 0xf;

	for (i = 0; i < 4; i++) {
		axes[i] = readw(pcigame->base + pcigame->data->axes + i * pcigame->data->axsize);
		if (axes[i] == pcigame->data->axmax) axes[i] = -1;
	}
        
        return 0;
}

static int pcigame_open(struct gameport *gameport, int mode)
{
	struct pcigame *pcigame = gameport->driver;

	switch (mode) {
		case GAMEPORT_MODE_COOKED:
			writeb(pcigame->data->adcmode, pcigame->base + pcigame->data->gcr);
			wait_ms(PCIGAME_DATA_WAIT);
			return 0;
		case GAMEPORT_MODE_RAW:
			writeb(0, pcigame->base + pcigame->data->gcr);
			return 0;
		default:
			return -1;
	}

	return 0;
}

struct pcigame *pcigame_attach(struct pci_dev *dev, int type)
{
	struct pcigame *pcigame;
	int i;

	if (!(pcigame = kmalloc(sizeof(struct pcigame), GFP_KERNEL)))
		return NULL;
        memset(pcigame, 0, sizeof(struct pcigame));


	pcigame->data = pcigame_data + type;

	pcigame->dev = dev;

	pcigame->gameport.driver = pcigame;
	pcigame->gameport.fuzz = 64;
	
	pcigame->gameport.read = pcigame_read;
	pcigame->gameport.trigger = pcigame_trigger;
	pcigame->gameport.cooked_read = pcigame_cooked_read;
	pcigame->gameport.open = pcigame_open;

	for (i = 0; i < 6; i++)
		if (~pci_resource_flags(dev, i) & IORESOURCE_IO)
			break;
	if(i==6)
		return NULL;

	pci_enable_device(dev);

	pcigame->base = ioremap(pci_resource_start(pcigame->dev, i),
				pci_resource_len(pcigame->dev, i));

	gameport_register_port(&pcigame->gameport);
	
	printk(KERN_INFO "gameport%d: %s at pci%02x:%02x.%x speed %d kHz\n",
		pcigame->gameport.number, dev->name, dev->bus->number,
			PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), pcigame->gameport.speed);

	return pcigame;
}

EXPORT_SYMBOL_GPL(pcigame_attach);


void pcigame_detach(struct pcigame *game)
{
	gameport_unregister_port(&game->gameport);
	iounmap(game->base);
	kfree(game);
}

EXPORT_SYMBOL_GPL(pcigame_detach);

static __devinit int pcigame_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct pcigame *r = pcigame_attach(dev, id->driver_data);
	if(r == NULL)
		return -1;
	pci_set_drvdata(dev, r);
	return 0;
}

static void __devexit pcigame_remove(struct pci_dev *dev)
{
	struct pcigame *pcigame = pci_get_drvdata(dev);
	pcigame_detach(pcigame);
}


static struct pci_device_id pcigame_id_table[] __devinitdata =
{
/* If the trident is configured in audio grabs it and we get called by
   that */
#if !defined(CONFIG_SOUND_TRIDENT) && !defined(CONFIG_SOUND_TRIDENT_MODULE)
 { PCI_VENDOR_ID_TRIDENT, 0x2000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, PCIGAME_4DWAVE  },
 { PCI_VENDOR_ID_TRIDENT, 0x2001, PCI_ANY_ID, PCI_ANY_ID, 0, 0, PCIGAME_4DWAVE  },
 { PCI_VENDOR_ID_AL,      0x5451, PCI_ANY_ID, PCI_ANY_ID, 0, 0, PCIGAME_4DWAVE  },
#endif 
 { PCI_VENDOR_ID_AUREAL,  0x0001, PCI_ANY_ID, PCI_ANY_ID, 0, 0, PCIGAME_VORTEX  },
 { PCI_VENDOR_ID_AUREAL,  0x0002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, PCIGAME_VORTEX2 },
 { 0 }};

static struct pci_driver pcigame_driver = {
	name:		"pcigame",
	id_table:	pcigame_id_table,
	probe:		pcigame_probe,
	remove:		__devexit_p(pcigame_remove),
};

int __init pcigame_init(void)
{
	pci_register_driver(&pcigame_driver);
	/* Needed by other modules */
	return 0;
}

void __exit pcigame_exit(void)
{
	pci_unregister_driver(&pcigame_driver);
}

module_init(pcigame_init);
module_exit(pcigame_exit);

MODULE_LICENSE("GPL");