// SPDX-License-Identifier: GPL-2.0-or-later
/*
    card-opti92x-ad1848.c - driver for OPTi 82c92x based soundcards.
    Copyright (C) 1998-2000 by Massimo Piccioni <dafastidio@libero.it>

    Part of this code was developed at the Italian Ministry of Air Defence,
    Sixth Division (oh, che pace ...), Rome.

    Thanks to Maria Grazia Pollarini, Salvatore Vassallo.

*/


#include <linux/init.h>
#include <linux/err.h>
#include <linux/isa.h>
#include <linux/delay.h>
#include <linux/pnp.h>
#include <linux/module.h>
#include <linux/io.h>
#include <asm/dma.h>
#include <sound/core.h>
#include <sound/tlv.h>
#include <sound/wss.h>
#include <sound/mpu401.h>
#include <sound/opl3.h>
#ifndef OPTi93X
#include <sound/opl4.h>
#endif
#define SNDRV_LEGACY_FIND_FREE_IOPORT
#define SNDRV_LEGACY_FIND_FREE_IRQ
#define SNDRV_LEGACY_FIND_FREE_DMA
#include <sound/initval.h>

MODULE_AUTHOR("Massimo Piccioni <dafastidio@libero.it>");
MODULE_LICENSE("GPL");
#ifdef OPTi93X
MODULE_DESCRIPTION("OPTi93X");
#else	/* OPTi93X */
#ifdef CS4231
MODULE_DESCRIPTION("OPTi92X - CS4231");
#else	/* CS4231 */
MODULE_DESCRIPTION("OPTi92X - AD1848");
#endif	/* CS4231 */
#endif	/* OPTi93X */

static int index = SNDRV_DEFAULT_IDX1;	/* Index 0-MAX */
static char *id = SNDRV_DEFAULT_STR1;		/* ID for this card */
//static bool enable = SNDRV_DEFAULT_ENABLE1;	/* Enable this card */
#ifdef CONFIG_PNP
static bool isapnp = true;			/* Enable ISA PnP detection */
#endif
static long port = SNDRV_DEFAULT_PORT1; 	/* 0x530,0xe80,0xf40,0x604 */
static long mpu_port = SNDRV_DEFAULT_PORT1;	/* 0x300,0x310,0x320,0x330 */
static long fm_port = SNDRV_DEFAULT_PORT1;	/* 0x388 */
static int irq = SNDRV_DEFAULT_IRQ1;		/* 5,7,9,10,11 */
static int mpu_irq = SNDRV_DEFAULT_IRQ1;	/* 5,7,9,10 */
static int dma1 = SNDRV_DEFAULT_DMA1;		/* 0,1,3 */
#if defined(CS4231) || defined(OPTi93X)
static int dma2 = SNDRV_DEFAULT_DMA1;		/* 0,1,3 */
#endif	/* CS4231 || OPTi93X */

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for opti9xx based soundcard.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for opti9xx based soundcard.");
//module_param(enable, bool, 0444);
//MODULE_PARM_DESC(enable, "Enable opti9xx soundcard.");
#ifdef CONFIG_PNP
module_param(isapnp, bool, 0444);
MODULE_PARM_DESC(isapnp, "Enable ISA PnP detection for specified soundcard.");
#endif
module_param_hw(port, long, ioport, 0444);
MODULE_PARM_DESC(port, "WSS port # for opti9xx driver.");
module_param_hw(mpu_port, long, ioport, 0444);
MODULE_PARM_DESC(mpu_port, "MPU-401 port # for opti9xx driver.");
module_param_hw(fm_port, long, ioport, 0444);
MODULE_PARM_DESC(fm_port, "FM port # for opti9xx driver.");
module_param_hw(irq, int, irq, 0444);
MODULE_PARM_DESC(irq, "WSS irq # for opti9xx driver.");
module_param_hw(mpu_irq, int, irq, 0444);
MODULE_PARM_DESC(mpu_irq, "MPU-401 irq # for opti9xx driver.");
module_param_hw(dma1, int, dma, 0444);
MODULE_PARM_DESC(dma1, "1st dma # for opti9xx driver.");
#if defined(CS4231) || defined(OPTi93X)
module_param_hw(dma2, int, dma, 0444);
MODULE_PARM_DESC(dma2, "2nd dma # for opti9xx driver.");
#endif	/* CS4231 || OPTi93X */

#define OPTi9XX_HW_82C928	1
#define OPTi9XX_HW_82C929	2
#define OPTi9XX_HW_82C924	3
#define OPTi9XX_HW_82C925	4
#define OPTi9XX_HW_82C930	5
#define OPTi9XX_HW_82C931	6
#define OPTi9XX_HW_82C933	7
#define OPTi9XX_HW_LAST		OPTi9XX_HW_82C933

#define OPTi9XX_MC_REG(n)	n

#ifdef OPTi93X

#define OPTi93X_STATUS			0x02
#define OPTi93X_PORT(chip, r)		((chip)->port + OPTi93X_##r)

#define OPTi93X_IRQ_PLAYBACK		0x04
#define OPTi93X_IRQ_CAPTURE		0x08

#endif /* OPTi93X */

struct snd_opti9xx {
	unsigned short hardware;
	unsigned char password;
	char name[7];

	unsigned long mc_base;
	struct resource *res_mc_base;
	unsigned long mc_base_size;
#ifdef OPTi93X
	unsigned long mc_indir_index;
	struct resource *res_mc_indir;
#endif	/* OPTi93X */
	struct snd_wss *codec;
	unsigned long pwd_reg;

	spinlock_t lock;

	long wss_base;
	int irq;
};

static int snd_opti9xx_pnp_is_probed;

#ifdef CONFIG_PNP

static const struct pnp_card_device_id snd_opti9xx_pnpids[] = {
#ifndef OPTi93X
	/* OPTi 82C924 */
	{ .id = "OPT0924",
	  .devs = { { "OPT0000" }, { "OPT0002" }, { "OPT0005" } },
	  .driver_data = 0x0924 },
	/* OPTi 82C925 */
	{ .id = "OPT0925",
	  .devs = { { "OPT9250" }, { "OPT0002" }, { "OPT0005" } },
	  .driver_data = 0x0925 },
#else
	/* OPTi 82C931/3 */
	{ .id = "OPT0931", .devs = { { "OPT9310" }, { "OPT0002" } },
	  .driver_data = 0x0931 },
#endif	/* OPTi93X */
	{ .id = "" }
};

MODULE_DEVICE_TABLE(pnp_card, snd_opti9xx_pnpids);

#endif	/* CONFIG_PNP */

#define DEV_NAME KBUILD_MODNAME

static const char * const snd_opti9xx_names[] = {
	"unknown",
	"82C928",	"82C929",
	"82C924",	"82C925",
	"82C930",	"82C931",	"82C933"
};

static int snd_opti9xx_init(struct snd_opti9xx *chip,
			    unsigned short hardware)
{
	static const int opti9xx_mc_size[] = {7, 7, 10, 10, 2, 2, 2};

	chip->hardware = hardware;
	strcpy(chip->name, snd_opti9xx_names[hardware]);

	spin_lock_init(&chip->lock);

	chip->irq = -1;

#ifndef OPTi93X
#ifdef CONFIG_PNP
	if (isapnp && chip->mc_base)
		/* PnP resource gives the least 10 bits */
		chip->mc_base |= 0xc00;
	else
#endif	/* CONFIG_PNP */
	{
		chip->mc_base = 0xf8c;
		chip->mc_base_size = opti9xx_mc_size[hardware];
	}
#else
		chip->mc_base_size = opti9xx_mc_size[hardware];
#endif

	switch (hardware) {
#ifndef OPTi93X
	case OPTi9XX_HW_82C928:
	case OPTi9XX_HW_82C929:
		chip->password = (hardware == OPTi9XX_HW_82C928) ? 0xe2 : 0xe3;
		chip->pwd_reg = 3;
		break;

	case OPTi9XX_HW_82C924:
	case OPTi9XX_HW_82C925:
		chip->password = 0xe5;
		chip->pwd_reg = 3;
		break;
#else	/* OPTi93X */

	case OPTi9XX_HW_82C930:
	case OPTi9XX_HW_82C931:
	case OPTi9XX_HW_82C933:
		chip->mc_base = (hardware == OPTi9XX_HW_82C930) ? 0xf8f : 0xf8d;
		if (!chip->mc_indir_index)
			chip->mc_indir_index = 0xe0e;
		chip->password = 0xe4;
		chip->pwd_reg = 0;
		break;
#endif	/* OPTi93X */

	default:
		snd_printk(KERN_ERR "chip %d not supported\n", hardware);
		return -ENODEV;
	}
	return 0;
}

static unsigned char snd_opti9xx_read(struct snd_opti9xx *chip,
				      unsigned char reg)
{
	unsigned long flags;
	unsigned char retval = 0xff;

	spin_lock_irqsave(&chip->lock, flags);
	outb(chip->password, chip->mc_base + chip->pwd_reg);

	switch (chip->hardware) {
#ifndef OPTi93X
	case OPTi9XX_HW_82C924:
	case OPTi9XX_HW_82C925:
		if (reg > 7) {
			outb(reg, chip->mc_base + 8);
			outb(chip->password, chip->mc_base + chip->pwd_reg);
			retval = inb(chip->mc_base + 9);
			break;
		}
		fallthrough;

	case OPTi9XX_HW_82C928:
	case OPTi9XX_HW_82C929:
		retval = inb(chip->mc_base + reg);
		break;
#else	/* OPTi93X */

	case OPTi9XX_HW_82C930:
	case OPTi9XX_HW_82C931:
	case OPTi9XX_HW_82C933:
		outb(reg, chip->mc_indir_index);
		outb(chip->password, chip->mc_base + chip->pwd_reg);
		retval = inb(chip->mc_indir_index + 1);
		break;
#endif	/* OPTi93X */

	default:
		snd_printk(KERN_ERR "chip %d not supported\n", chip->hardware);
	}

	spin_unlock_irqrestore(&chip->lock, flags);
	return retval;
}

static void snd_opti9xx_write(struct snd_opti9xx *chip, unsigned char reg,
			      unsigned char value)
{
	unsigned long flags;

	spin_lock_irqsave(&chip->lock, flags);
	outb(chip->password, chip->mc_base + chip->pwd_reg);

	switch (chip->hardware) {
#ifndef OPTi93X
	case OPTi9XX_HW_82C924:
	case OPTi9XX_HW_82C925:
		if (reg > 7) {
			outb(reg, chip->mc_base + 8);
			outb(chip->password, chip->mc_base + chip->pwd_reg);
			outb(value, chip->mc_base + 9);
			break;
		}
		fallthrough;

	case OPTi9XX_HW_82C928:
	case OPTi9XX_HW_82C929:
		outb(value, chip->mc_base + reg);
		break;
#else	/* OPTi93X */

	case OPTi9XX_HW_82C930:
	case OPTi9XX_HW_82C931:
	case OPTi9XX_HW_82C933:
		outb(reg, chip->mc_indir_index);
		outb(chip->password, chip->mc_base + chip->pwd_reg);
		outb(value, chip->mc_indir_index + 1);
		break;
#endif	/* OPTi93X */

	default:
		snd_printk(KERN_ERR "chip %d not supported\n", chip->hardware);
	}

	spin_unlock_irqrestore(&chip->lock, flags);
}


static inline void snd_opti9xx_write_mask(struct snd_opti9xx *chip,
		unsigned char reg, unsigned char value, unsigned char mask)
{
	unsigned char oldval = snd_opti9xx_read(chip, reg);

	snd_opti9xx_write(chip, reg, (oldval & ~mask) | (value & mask));
}

static int snd_opti9xx_configure(struct snd_opti9xx *chip,
					   long port,
					   int irq, int dma1, int dma2,
					   long mpu_port, int mpu_irq)
{
	unsigned char wss_base_bits;
	unsigned char irq_bits;
	unsigned char dma_bits;
	unsigned char mpu_port_bits = 0;
	unsigned char mpu_irq_bits;

	switch (chip->hardware) {
#ifndef OPTi93X
	case OPTi9XX_HW_82C924:
		/* opti 929 mode (?), OPL3 clock output, audio enable */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(4), 0xf0, 0xfc);
		/* enable wave audio */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(6), 0x02, 0x02);
		fallthrough;

	case OPTi9XX_HW_82C925:
		/* enable WSS mode */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(1), 0x80, 0x80);
		/* OPL3 FM synthesis */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(2), 0x00, 0x20);
		/* disable Sound Blaster IRQ and DMA */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(3), 0xf0, 0xff);
#ifdef CS4231
		/* cs4231/4248 fix enabled */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(5), 0x02, 0x02);
#else
		/* cs4231/4248 fix disabled */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(5), 0x00, 0x02);
#endif	/* CS4231 */
		break;

	case OPTi9XX_HW_82C928:
	case OPTi9XX_HW_82C929:
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(1), 0x80, 0x80);
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(2), 0x00, 0x20);
		/*
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(3), 0xa2, 0xae);
		*/
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(4), 0x00, 0x0c);
#ifdef CS4231
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(5), 0x02, 0x02);
#else
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(5), 0x00, 0x02);
#endif	/* CS4231 */
		break;

#else	/* OPTi93X */
	case OPTi9XX_HW_82C931:
		/* disable 3D sound (set GPIO1 as output, low) */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(20), 0x04, 0x0c);
		fallthrough;

	case OPTi9XX_HW_82C933:
		/*
		 * The BTC 1817DW has QS1000 wavetable which is connected
		 * to the serial digital input of the OPTI931.
		 */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(21), 0x82, 0xff);
		/* 
		 * This bit sets OPTI931 to automaticaly select FM
		 * or digital input signal.
		 */
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(26), 0x01, 0x01);
		fallthrough;

	case OPTi9XX_HW_82C930:
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(6), 0x02, 0x03);
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(3), 0x00, 0xff);
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(4), 0x10 |
			(chip->hardware == OPTi9XX_HW_82C930 ? 0x00 : 0x04),
			0x34);
		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(5), 0x20, 0xbf);
		break;
#endif	/* OPTi93X */

	default:
		snd_printk(KERN_ERR "chip %d not supported\n", chip->hardware);
		return -EINVAL;
	}

	/* PnP resource says it decodes only 10 bits of address */
	switch (port & 0x3ff) {
	case 0x130:
		chip->wss_base = 0x530;
		wss_base_bits = 0x00;
		break;
	case 0x204:
		chip->wss_base = 0x604;
		wss_base_bits = 0x03;
		break;
	case 0x280:
		chip->wss_base = 0xe80;
		wss_base_bits = 0x01;
		break;
	case 0x340:
		chip->wss_base = 0xf40;
		wss_base_bits = 0x02;
		break;
	default:
		snd_printk(KERN_WARNING "WSS port 0x%lx not valid\n", port);
		goto __skip_base;
	}
	snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(1), wss_base_bits << 4, 0x30);

__skip_base:
	switch (irq) {
//#ifdef OPTi93X
	case 5:
		irq_bits = 0x05;
		break;
//#endif	/* OPTi93X */
	case 7:
		irq_bits = 0x01;
		break;
	case 9:
		irq_bits = 0x02;
		break;
	case 10:
		irq_bits = 0x03;
		break;
	case 11:
		irq_bits = 0x04;
		break;
	default:
		snd_printk(KERN_WARNING "WSS irq # %d not valid\n", irq);
		goto __skip_resources;
	}

	switch (dma1) {
	case 0:
		dma_bits = 0x01;
		break;
	case 1:
		dma_bits = 0x02;
		break;
	case 3:
		dma_bits = 0x03;
		break;
	default:
		snd_printk(KERN_WARNING "WSS dma1 # %d not valid\n", dma1);
		goto __skip_resources;
	}

#if defined(CS4231) || defined(OPTi93X)
	if (dma1 == dma2) {
		snd_printk(KERN_ERR "don't want to share dmas\n");
		return -EBUSY;
	}

	switch (dma2) {
	case 0:
	case 1:
		break;
	default:
		snd_printk(KERN_WARNING "WSS dma2 # %d not valid\n", dma2);
		goto __skip_resources;
	}
	dma_bits |= 0x04;
#endif	/* CS4231 || OPTi93X */

#ifndef OPTi93X
	 outb(irq_bits << 3 | dma_bits, chip->wss_base);
#else /* OPTi93X */
	snd_opti9xx_write(chip, OPTi9XX_MC_REG(3), (irq_bits << 3 | dma_bits));
#endif /* OPTi93X */

__skip_resources:
	if (chip->hardware > OPTi9XX_HW_82C928) {
		switch (mpu_port) {
		case 0:
		case -1:
			break;
		case 0x300:
			mpu_port_bits = 0x03;
			break;
		case 0x310:
			mpu_port_bits = 0x02;
			break;
		case 0x320:
			mpu_port_bits = 0x01;
			break;
		case 0x330:
			mpu_port_bits = 0x00;
			break;
		default:
			snd_printk(KERN_WARNING
				   "MPU-401 port 0x%lx not valid\n", mpu_port);
			goto __skip_mpu;
		}

		switch (mpu_irq) {
		case 5:
			mpu_irq_bits = 0x02;
			break;
		case 7:
			mpu_irq_bits = 0x03;
			break;
		case 9:
			mpu_irq_bits = 0x00;
			break;
		case 10:
			mpu_irq_bits = 0x01;
			break;
		default:
			snd_printk(KERN_WARNING "MPU-401 irq # %d not valid\n",
				mpu_irq);
			goto __skip_mpu;
		}

		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(6),
			(mpu_port <= 0) ? 0x00 :
				0x80 | mpu_port_bits << 5 | mpu_irq_bits << 3,
			0xf8);
	}
__skip_mpu:

	return 0;
}

#ifdef OPTi93X

static const DECLARE_TLV_DB_SCALE(db_scale_5bit_3db_step, -9300, 300, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_5bit, -4650, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_4bit_12db_max, -3300, 300, 0);

static const struct snd_kcontrol_new snd_opti93x_controls[] = {
WSS_DOUBLE("Master Playback Switch", 0,
		OPTi93X_OUT_LEFT, OPTi93X_OUT_RIGHT, 7, 7, 1, 1),
WSS_DOUBLE_TLV("Master Playback Volume", 0,
		OPTi93X_OUT_LEFT, OPTi93X_OUT_RIGHT, 1, 1, 31, 1,
		db_scale_5bit_3db_step),
WSS_DOUBLE_TLV("PCM Playback Volume", 0,
		CS4231_LEFT_OUTPUT, CS4231_RIGHT_OUTPUT, 0, 0, 31, 1,
		db_scale_5bit),
WSS_DOUBLE_TLV("FM Playback Volume", 0,
		CS4231_AUX2_LEFT_INPUT, CS4231_AUX2_RIGHT_INPUT, 1, 1, 15, 1,
		db_scale_4bit_12db_max),
WSS_DOUBLE("Line Playback Switch", 0,
		CS4231_LEFT_LINE_IN, CS4231_RIGHT_LINE_IN, 7, 7, 1, 1),
WSS_DOUBLE_TLV("Line Playback Volume", 0,
		CS4231_LEFT_LINE_IN, CS4231_RIGHT_LINE_IN, 0, 0, 15, 1,
		db_scale_4bit_12db_max),
WSS_DOUBLE("Mic Playback Switch", 0,
		OPTi93X_MIC_LEFT_INPUT, OPTi93X_MIC_RIGHT_INPUT, 7, 7, 1, 1),
WSS_DOUBLE_TLV("Mic Playback Volume", 0,
		OPTi93X_MIC_LEFT_INPUT, OPTi93X_MIC_RIGHT_INPUT, 1, 1, 15, 1,
		db_scale_4bit_12db_max),
WSS_DOUBLE_TLV("CD Playback Volume", 0,
		CS4231_AUX1_LEFT_INPUT, CS4231_AUX1_RIGHT_INPUT, 1, 1, 15, 1,
		db_scale_4bit_12db_max),
WSS_DOUBLE("Aux Playback Switch", 0,
		OPTi931_AUX_LEFT_INPUT, OPTi931_AUX_RIGHT_INPUT, 7, 7, 1, 1),
WSS_DOUBLE_TLV("Aux Playback Volume", 0,
		OPTi931_AUX_LEFT_INPUT, OPTi931_AUX_RIGHT_INPUT, 1, 1, 15, 1,
		db_scale_4bit_12db_max),
};

static int snd_opti93x_mixer(struct snd_wss *chip)
{
	struct snd_card *card;
	unsigned int idx;
	struct snd_ctl_elem_id id1, id2;
	int err;

	if (snd_BUG_ON(!chip || !chip->pcm))
		return -EINVAL;

	card = chip->card;

	strcpy(card->mixername, chip->pcm->name);

	memset(&id1, 0, sizeof(id1));
	memset(&id2, 0, sizeof(id2));
	id1.iface = id2.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
	/* reassign AUX0 switch to CD */
	strcpy(id1.name, "Aux Playback Switch");
	strcpy(id2.name, "CD Playback Switch");
	err = snd_ctl_rename_id(card, &id1, &id2);
	if (err < 0) {
		snd_printk(KERN_ERR "Cannot rename opti93x control\n");
		return err;
	}
	/* reassign AUX1 switch to FM */
	strcpy(id1.name, "Aux Playback Switch"); id1.index = 1;
	strcpy(id2.name, "FM Playback Switch");
	err = snd_ctl_rename_id(card, &id1, &id2);
	if (err < 0) {
		snd_printk(KERN_ERR "Cannot rename opti93x control\n");
		return err;
	}
	/* remove AUX1 volume */
	strcpy(id1.name, "Aux Playback Volume"); id1.index = 1;
	snd_ctl_remove_id(card, &id1);

	/* Replace WSS volume controls with OPTi93x volume controls */
	id1.index = 0;
	for (idx = 0; idx < ARRAY_SIZE(snd_opti93x_controls); idx++) {
		strcpy(id1.name, snd_opti93x_controls[idx].name);
		snd_ctl_remove_id(card, &id1);

		err = snd_ctl_add(card,
				snd_ctl_new1(&snd_opti93x_controls[idx], chip));
		if (err < 0)
			return err;
	}
	return 0;
}

static irqreturn_t snd_opti93x_interrupt(int irq, void *dev_id)
{
	struct snd_opti9xx *chip = dev_id;
	struct snd_wss *codec = chip->codec;
	unsigned char status;

	if (!codec)
		return IRQ_HANDLED;

	status = snd_opti9xx_read(chip, OPTi9XX_MC_REG(11));
	if ((status & OPTi93X_IRQ_PLAYBACK) && codec->playback_substream)
		snd_pcm_period_elapsed(codec->playback_substream);
	if ((status & OPTi93X_IRQ_CAPTURE) && codec->capture_substream) {
		snd_wss_overrange(codec);
		snd_pcm_period_elapsed(codec->capture_substream);
	}
	outb(0x00, OPTi93X_PORT(codec, STATUS));
	return IRQ_HANDLED;
}

#endif /* OPTi93X */

static int snd_opti9xx_read_check(struct snd_opti9xx *chip)
{
	unsigned char value;
#ifdef OPTi93X
	unsigned long flags;
#endif

	chip->res_mc_base = request_region(chip->mc_base, chip->mc_base_size,
					   "OPTi9xx MC");
	if (chip->res_mc_base == NULL)
		return -EBUSY;
#ifndef OPTi93X
	value = snd_opti9xx_read(chip, OPTi9XX_MC_REG(1));
	if (value != 0xff && value != inb(chip->mc_base + OPTi9XX_MC_REG(1)))
		if (value == snd_opti9xx_read(chip, OPTi9XX_MC_REG(1)))
			return 0;
#else	/* OPTi93X */
	chip->res_mc_indir = request_region(chip->mc_indir_index, 2,
					    "OPTi93x MC");
	if (chip->res_mc_indir == NULL)
		return -EBUSY;

	spin_lock_irqsave(&chip->lock, flags);
	outb(chip->password, chip->mc_base + chip->pwd_reg);
	outb(((chip->mc_indir_index & 0x1f0) >> 4), chip->mc_base);
	spin_unlock_irqrestore(&chip->lock, flags);

	value = snd_opti9xx_read(chip, OPTi9XX_MC_REG(7));
	snd_opti9xx_write(chip, OPTi9XX_MC_REG(7), 0xff - value);
	if (snd_opti9xx_read(chip, OPTi9XX_MC_REG(7)) == 0xff - value)
		return 0;

	release_and_free_resource(chip->res_mc_indir);
	chip->res_mc_indir = NULL;
#endif	/* OPTi93X */
	release_and_free_resource(chip->res_mc_base);
	chip->res_mc_base = NULL;

	return -ENODEV;
}

static int snd_card_opti9xx_detect(struct snd_card *card,
				   struct snd_opti9xx *chip)
{
	int i, err;

#ifndef OPTi93X
	for (i = OPTi9XX_HW_82C928; i < OPTi9XX_HW_82C930; i++) {
#else
	for (i = OPTi9XX_HW_82C931; i >= OPTi9XX_HW_82C930; i--) {
#endif
		err = snd_opti9xx_init(chip, i);
		if (err < 0)
			return err;

		err = snd_opti9xx_read_check(chip);
		if (err == 0)
			return 1;
#ifdef OPTi93X
		chip->mc_indir_index = 0;
#endif
	}
	return -ENODEV;
}

#ifdef CONFIG_PNP
static int snd_card_opti9xx_pnp(struct snd_opti9xx *chip,
				struct pnp_card_link *card,
				const struct pnp_card_device_id *pid)
{
	struct pnp_dev *pdev;
	int err;
	struct pnp_dev *devmpu;
#ifndef OPTi93X
	struct pnp_dev *devmc;
#endif

	pdev = pnp_request_card_device(card, pid->devs[0].id, NULL);
	if (pdev == NULL)
		return -EBUSY;

	err = pnp_activate_dev(pdev);
	if (err < 0) {
		snd_printk(KERN_ERR "AUDIO pnp configure failure: %d\n", err);
		return err;
	}

#ifdef OPTi93X
	port = pnp_port_start(pdev, 0) - 4;
	fm_port = pnp_port_start(pdev, 1) + 8;
	/* adjust mc_indir_index - some cards report it at 0xe?d,
	   other at 0xe?c but it really is always at 0xe?e */
	chip->mc_indir_index = (pnp_port_start(pdev, 3) & ~0xf) | 0xe;
#else
	devmc = pnp_request_card_device(card, pid->devs[2].id, NULL);
	if (devmc == NULL)
		return -EBUSY;

	err = pnp_activate_dev(devmc);
	if (err < 0) {
		snd_printk(KERN_ERR "MC pnp configure failure: %d\n", err);
		return err;
	}

	port = pnp_port_start(pdev, 1);
	fm_port = pnp_port_start(pdev, 2) + 8;
	/*
	 * The MC(0) is never accessed and card does not
	 * include it in the PnP resource range. OPTI93x include it.
	 */
	chip->mc_base = pnp_port_start(devmc, 0) - 1;
	chip->mc_base_size = pnp_port_len(devmc, 0) + 1;
#endif	/* OPTi93X */
	irq = pnp_irq(pdev, 0);
	dma1 = pnp_dma(pdev, 0);
#if defined(CS4231) || defined(OPTi93X)
	dma2 = pnp_dma(pdev, 1);
#endif	/* CS4231 || OPTi93X */

	devmpu = pnp_request_card_device(card, pid->devs[1].id, NULL);

	if (devmpu && mpu_port > 0) {
		err = pnp_activate_dev(devmpu);
		if (err < 0) {
			snd_printk(KERN_ERR "MPU401 pnp configure failure\n");
			mpu_port = -1;
		} else {
			mpu_port = pnp_port_start(devmpu, 0);
			mpu_irq = pnp_irq(devmpu, 0);
		}
	}
	return pid->driver_data;
}
#endif	/* CONFIG_PNP */

static void snd_card_opti9xx_free(struct snd_card *card)
{
	struct snd_opti9xx *chip = card->private_data;

	if (chip) {
#ifdef OPTi93X
		if (chip->irq > 0) {
			disable_irq(chip->irq);
			free_irq(chip->irq, chip);
		}
		release_and_free_resource(chip->res_mc_indir);
#endif
		release_and_free_resource(chip->res_mc_base);
	}
}

static int snd_opti9xx_probe(struct snd_card *card)
{
	static const long possible_ports[] = {0x530, 0xe80, 0xf40, 0x604, -1};
	int error;
	int xdma2;
	struct snd_opti9xx *chip = card->private_data;
	struct snd_wss *codec;
	struct snd_rawmidi *rmidi;
	struct snd_hwdep *synth;

#if defined(CS4231) || defined(OPTi93X)
	xdma2 = dma2;
#else
	xdma2 = -1;
#endif

	if (port == SNDRV_AUTO_PORT) {
		port = snd_legacy_find_free_ioport(possible_ports, 4);
		if (port < 0) {
			snd_printk(KERN_ERR "unable to find a free WSS port\n");
			return -EBUSY;
		}
	}
	error = snd_opti9xx_configure(chip, port, irq, dma1, xdma2,
				      mpu_port, mpu_irq);
	if (error)
		return error;

	error = snd_wss_create(card, chip->wss_base + 4, -1, irq, dma1, xdma2,
#ifdef OPTi93X
			       WSS_HW_OPTI93X, WSS_HWSHARE_IRQ,
#else
			       WSS_HW_DETECT, 0,
#endif
			       &codec);
	if (error < 0)
		return error;
	chip->codec = codec;
	error = snd_wss_pcm(codec, 0);
	if (error < 0)
		return error;
	error = snd_wss_mixer(codec);
	if (error < 0)
		return error;
#ifdef OPTi93X
	error = snd_opti93x_mixer(codec);
	if (error < 0)
		return error;
#endif
#ifdef CS4231
	error = snd_wss_timer(codec, 0);
	if (error < 0)
		return error;
#endif
#ifdef OPTi93X
	error = request_irq(irq, snd_opti93x_interrupt,
			    0, DEV_NAME" - WSS", chip);
	if (error < 0) {
		snd_printk(KERN_ERR "opti9xx: can't grab IRQ %d\n", irq);
		return error;
	}
#endif
	chip->irq = irq;
	card->sync_irq = chip->irq;
	strcpy(card->driver, chip->name);
	sprintf(card->shortname, "OPTi %s", card->driver);
#if defined(CS4231) || defined(OPTi93X)
	snprintf(card->longname, sizeof(card->longname),
		 "%s, %s at 0x%lx, irq %d, dma %d&%d",
		 card->shortname, codec->pcm->name,
		 chip->wss_base + 4, irq, dma1, xdma2);
#else
	snprintf(card->longname, sizeof(card->longname),
		 "%s, %s at 0x%lx, irq %d, dma %d",
		 card->shortname, codec->pcm->name, chip->wss_base + 4, irq,
		 dma1);
#endif	/* CS4231 || OPTi93X */

	if (mpu_port <= 0 || mpu_port == SNDRV_AUTO_PORT)
		rmidi = NULL;
	else {
		error = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401,
				mpu_port, 0, mpu_irq, &rmidi);
		if (error)
			snd_printk(KERN_WARNING "no MPU-401 device at 0x%lx?\n",
				   mpu_port);
	}

	if (fm_port > 0 && fm_port != SNDRV_AUTO_PORT) {
		struct snd_opl3 *opl3 = NULL;
#ifndef OPTi93X
		if (chip->hardware == OPTi9XX_HW_82C928 ||
		    chip->hardware == OPTi9XX_HW_82C929 ||
		    chip->hardware == OPTi9XX_HW_82C924) {
			struct snd_opl4 *opl4;
			/* assume we have an OPL4 */
			snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(2),
					       0x20, 0x20);
			if (snd_opl4_create(card, fm_port, fm_port - 8,
					    2, &opl3, &opl4) < 0) {
				/* no luck, use OPL3 instead */
				snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(2),
						       0x00, 0x20);
			}
		}
#endif	/* !OPTi93X */
		if (!opl3 && snd_opl3_create(card, fm_port, fm_port + 2,
					     OPL3_HW_AUTO, 0, &opl3) < 0) {
			snd_printk(KERN_WARNING "no OPL device at 0x%lx-0x%lx\n",
				   fm_port, fm_port + 4 - 1);
		}
		if (opl3) {
			error = snd_opl3_hwdep_new(opl3, 0, 1, &synth);
			if (error < 0)
				return error;
		}
	}

	return snd_card_register(card);
}

static int snd_opti9xx_card_new(struct device *pdev, struct snd_card **cardp)
{
	struct snd_card *card;
	int err;

	err = snd_card_new(pdev, index, id, THIS_MODULE,
			   sizeof(struct snd_opti9xx), &card);
	if (err < 0)
		return err;
	card->private_free = snd_card_opti9xx_free;
	*cardp = card;
	return 0;
}

static int snd_opti9xx_isa_match(struct device *devptr,
				 unsigned int dev)
{
#ifdef CONFIG_PNP
	if (snd_opti9xx_pnp_is_probed)
		return 0;
	if (isapnp)
		return 0;
#endif
	return 1;
}

static int snd_opti9xx_isa_probe(struct device *devptr,
				 unsigned int dev)
{
	struct snd_card *card;
	int error;
	static const long possible_mpu_ports[] = {0x300, 0x310, 0x320, 0x330, -1};
#ifdef OPTi93X
	static const int possible_irqs[] = {5, 9, 10, 11, 7, -1};
#else
	static const int possible_irqs[] = {9, 10, 11, 7, -1};
#endif	/* OPTi93X */
	static const int possible_mpu_irqs[] = {5, 9, 10, 7, -1};
	static const int possible_dma1s[] = {3, 1, 0, -1};
#if defined(CS4231) || defined(OPTi93X)
	static const int possible_dma2s[][2] = {{1,-1}, {0,-1}, {-1,-1}, {0,-1}};
#endif	/* CS4231 || OPTi93X */

	if (mpu_port == SNDRV_AUTO_PORT) {
		if ((mpu_port = snd_legacy_find_free_ioport(possible_mpu_ports, 2)) < 0) {
			snd_printk(KERN_ERR "unable to find a free MPU401 port\n");
			return -EBUSY;
		}
	}
	if (irq == SNDRV_AUTO_IRQ) {
		if ((irq = snd_legacy_find_free_irq(possible_irqs)) < 0) {
			snd_printk(KERN_ERR "unable to find a free IRQ\n");
			return -EBUSY;
		}
	}
	if (mpu_irq == SNDRV_AUTO_IRQ) {
		if ((mpu_irq = snd_legacy_find_free_irq(possible_mpu_irqs)) < 0) {
			snd_printk(KERN_ERR "unable to find a free MPU401 IRQ\n");
			return -EBUSY;
		}
	}
	if (dma1 == SNDRV_AUTO_DMA) {
		if ((dma1 = snd_legacy_find_free_dma(possible_dma1s)) < 0) {
			snd_printk(KERN_ERR "unable to find a free DMA1\n");
			return -EBUSY;
		}
	}
#if defined(CS4231) || defined(OPTi93X)
	if (dma2 == SNDRV_AUTO_DMA) {
		if ((dma2 = snd_legacy_find_free_dma(possible_dma2s[dma1 % 4])) < 0) {
			snd_printk(KERN_ERR "unable to find a free DMA2\n");
			return -EBUSY;
		}
	}
#endif

	error = snd_opti9xx_card_new(devptr, &card);
	if (error < 0)
		return error;

	if ((error = snd_card_opti9xx_detect(card, card->private_data)) < 0) {
		snd_card_free(card);
		return error;
	}
	if ((error = snd_opti9xx_probe(card)) < 0) {
		snd_card_free(card);
		return error;
	}
	dev_set_drvdata(devptr, card);
	return 0;
}

static int snd_opti9xx_isa_remove(struct device *devptr,
				  unsigned int dev)
{
	snd_card_free(dev_get_drvdata(devptr));
	return 0;
}

#ifdef CONFIG_PM
static int snd_opti9xx_suspend(struct snd_card *card)
{
	struct snd_opti9xx *chip = card->private_data;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	chip->codec->suspend(chip->codec);
	return 0;
}

static int snd_opti9xx_resume(struct snd_card *card)
{
	struct snd_opti9xx *chip = card->private_data;
	int error, xdma2;
#if defined(CS4231) || defined(OPTi93X)
	xdma2 = dma2;
#else
	xdma2 = -1;
#endif

	error = snd_opti9xx_configure(chip, port, irq, dma1, xdma2,
				      mpu_port, mpu_irq);
	if (error)
		return error;
	chip->codec->resume(chip->codec);
	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;
}

static int snd_opti9xx_isa_suspend(struct device *dev, unsigned int n,
				   pm_message_t state)
{
	return snd_opti9xx_suspend(dev_get_drvdata(dev));
}

static int snd_opti9xx_isa_resume(struct device *dev, unsigned int n)
{
	return snd_opti9xx_resume(dev_get_drvdata(dev));
}
#endif

static struct isa_driver snd_opti9xx_driver = {
	.match		= snd_opti9xx_isa_match,
	.probe		= snd_opti9xx_isa_probe,
	.remove		= snd_opti9xx_isa_remove,
#ifdef CONFIG_PM
	.suspend	= snd_opti9xx_isa_suspend,
	.resume		= snd_opti9xx_isa_resume,
#endif
	.driver		= {
		.name	= DEV_NAME
	},
};

#ifdef CONFIG_PNP
static int snd_opti9xx_pnp_probe(struct pnp_card_link *pcard,
				 const struct pnp_card_device_id *pid)
{
	struct snd_card *card;
	int error, hw;
	struct snd_opti9xx *chip;

	if (snd_opti9xx_pnp_is_probed)
		return -EBUSY;
	if (! isapnp)
		return -ENODEV;
	error = snd_opti9xx_card_new(&pcard->card->dev, &card);
	if (error < 0)
		return error;
	chip = card->private_data;

	hw = snd_card_opti9xx_pnp(chip, pcard, pid);
	switch (hw) {
	case 0x0924:
		hw = OPTi9XX_HW_82C924;
		break;
	case 0x0925:
		hw = OPTi9XX_HW_82C925;
		break;
	case 0x0931:
		hw = OPTi9XX_HW_82C931;
		break;
	default:
		snd_card_free(card);
		return -ENODEV;
	}

	if ((error = snd_opti9xx_init(chip, hw))) {
		snd_card_free(card);
		return error;
	}
	error = snd_opti9xx_read_check(chip);
	if (error) {
		snd_printk(KERN_ERR "OPTI chip not found\n");
		snd_card_free(card);
		return error;
	}
	if ((error = snd_opti9xx_probe(card)) < 0) {
		snd_card_free(card);
		return error;
	}
	pnp_set_card_drvdata(pcard, card);
	snd_opti9xx_pnp_is_probed = 1;
	return 0;
}

static void snd_opti9xx_pnp_remove(struct pnp_card_link *pcard)
{
	snd_card_free(pnp_get_card_drvdata(pcard));
	pnp_set_card_drvdata(pcard, NULL);
	snd_opti9xx_pnp_is_probed = 0;
}

#ifdef CONFIG_PM
static int snd_opti9xx_pnp_suspend(struct pnp_card_link *pcard,
				   pm_message_t state)
{
	return snd_opti9xx_suspend(pnp_get_card_drvdata(pcard));
}

static int snd_opti9xx_pnp_resume(struct pnp_card_link *pcard)
{
	return snd_opti9xx_resume(pnp_get_card_drvdata(pcard));
}
#endif

static struct pnp_card_driver opti9xx_pnpc_driver = {
	.flags		= PNP_DRIVER_RES_DISABLE,
	.name		= DEV_NAME,
	.id_table	= snd_opti9xx_pnpids,
	.probe		= snd_opti9xx_pnp_probe,
	.remove		= snd_opti9xx_pnp_remove,
#ifdef CONFIG_PM
	.suspend	= snd_opti9xx_pnp_suspend,
	.resume		= snd_opti9xx_pnp_resume,
#endif
};
#endif

#ifdef OPTi93X
#define CHIP_NAME	"82C93x"
#else
#define CHIP_NAME	"82C92x"
#endif

static int __init alsa_card_opti9xx_init(void)
{
#ifdef CONFIG_PNP
	pnp_register_card_driver(&opti9xx_pnpc_driver);
	if (snd_opti9xx_pnp_is_probed)
		return 0;
	pnp_unregister_card_driver(&opti9xx_pnpc_driver);
#endif
	return isa_register_driver(&snd_opti9xx_driver, 1);
}

static void __exit alsa_card_opti9xx_exit(void)
{
	if (!snd_opti9xx_pnp_is_probed) {
		isa_unregister_driver(&snd_opti9xx_driver);
		return;
	}
#ifdef CONFIG_PNP
	pnp_unregister_card_driver(&opti9xx_pnpc_driver);
#endif
}

module_init(alsa_card_opti9xx_init)
module_exit(alsa_card_opti9xx_exit)