sound/drivers/opl3/opl3_lib.c - third_party/linux - Git at Google

 /*
  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>,
  *                   Hannu Savolainen 1993-1996,
  *                   Rob Hooft
  *
  *  Routines for control of AdLib FM cards (OPL2/OPL3/OPL4 chips)
  *
  *  Most if code is ported from OSS/Lite.
  *
  *   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
  *
  */

 #include <sound/opl3.h>
 #include <linux/io.h>
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <sound/minors.h>

 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Hannu Savolainen 1993-1996, Rob Hooft");
 MODULE_DESCRIPTION("Routines for control of AdLib FM cards (OPL2/OPL3/OPL4 chips)");
 MODULE_LICENSE("GPL");

 extern char snd_opl3_regmap[MAX_OPL2_VOICES][4];

 static void snd_opl2_command(struct snd_opl3 * opl3, unsigned short cmd, unsigned char val)
 {
 	unsigned long flags;
 	unsigned long port;

 	/*
 	 * The original 2-OP synth requires a quite long delay
 	 * after writing to a register.
 	 */

 	port = (cmd & OPL3_RIGHT) ? opl3->r_port : opl3->l_port;

 	spin_lock_irqsave(&opl3->reg_lock, flags);

 	outb((unsigned char) cmd, port);
 	udelay(10);

 	outb((unsigned char) val, port + 1);
 	udelay(30);

 	spin_unlock_irqrestore(&opl3->reg_lock, flags);
 }

 static void snd_opl3_command(struct snd_opl3 * opl3, unsigned short cmd, unsigned char val)
 {
 	unsigned long flags;
 	unsigned long port;

 	/*
 	 * The OPL-3 survives with just two INBs
 	 * after writing to a register.
 	 */

 	port = (cmd & OPL3_RIGHT) ? opl3->r_port : opl3->l_port;

 	spin_lock_irqsave(&opl3->reg_lock, flags);

 	outb((unsigned char) cmd, port);
 	inb(opl3->l_port);
 	inb(opl3->l_port);

 	outb((unsigned char) val, port + 1);
 	inb(opl3->l_port);
 	inb(opl3->l_port);

 	spin_unlock_irqrestore(&opl3->reg_lock, flags);
 }

 static int snd_opl3_detect(struct snd_opl3 * opl3)
 {
 	/*
 	 * This function returns 1 if the FM chip is present at the given I/O port
 	 * The detection algorithm plays with the timer built in the FM chip and
 	 * looks for a change in the status register.
 	 *
 	 * Note! The timers of the FM chip are not connected to AdLib (and compatible)
 	 * boards.
 	 *
 	 * Note2! The chip is initialized if detected.
 	 */

 	unsigned char stat1, stat2, signature;

 	/* Reset timers 1 and 2 */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_TIMER1_MASK | OPL3_TIMER2_MASK);
 	/* Reset the IRQ of the FM chip */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_IRQ_RESET);
 	signature = stat1 = inb(opl3->l_port);	/* Status register */
 	if ((stat1 & 0xe0) != 0x00) {	/* Should be 0x00 */
 		snd_printd("OPL3: stat1 = 0x%x\n", stat1);
 		return -ENODEV;
 	}
 	/* Set timer1 to 0xff */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER1, 0xff);
 	/* Unmask and start timer 1 */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_TIMER2_MASK | OPL3_TIMER1_START);
 	/* Now we have to delay at least 80us */
 	udelay(200);
 	/* Read status after timers have expired */
 	stat2 = inb(opl3->l_port);
 	/* Stop the timers */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_TIMER1_MASK | OPL3_TIMER2_MASK);
 	/* Reset the IRQ of the FM chip */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_IRQ_RESET);
 	if ((stat2 & 0xe0) != 0xc0) {	/* There is no YM3812 */
 		snd_printd("OPL3: stat2 = 0x%x\n", stat2);
 		return -ENODEV;
 	}

 	/* If the toplevel code knows exactly the type of chip, don't try
 	   to detect it. */
 	if (opl3->hardware != OPL3_HW_AUTO)
 		return 0;

 	/* There is a FM chip on this address. Detect the type (OPL2 to OPL4) */
 	if (signature == 0x06) {	/* OPL2 */
 		opl3->hardware = OPL3_HW_OPL2;
 	} else {
 		/*
 		 * If we had an OPL4 chip, opl3->hardware would have been set
 		 * by the OPL4 driver; so we can assume OPL3 here.
 		 */
 		if (snd_BUG_ON(!opl3->r_port))
 			return -ENODEV;
 		opl3->hardware = OPL3_HW_OPL3;
 	}
 	return 0;
 }

 /*
  *  AdLib timers
  */

 /*
  *  Timer 1 - 80us
  */

 static int snd_opl3_timer1_start(struct snd_timer * timer)
 {
 	unsigned long flags;
 	unsigned char tmp;
 	unsigned int ticks;
 	struct snd_opl3 *opl3;

 	opl3 = snd_timer_chip(timer);
 	spin_lock_irqsave(&opl3->timer_lock, flags);
 	ticks = timer->sticks;
 	tmp = (opl3->timer_enable | OPL3_TIMER1_START) & ~OPL3_TIMER1_MASK;
 	opl3->timer_enable = tmp;
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER1, 256 - ticks);	/* timer 1 count */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);	/* enable timer 1 IRQ */
 	spin_unlock_irqrestore(&opl3->timer_lock, flags);
 	return 0;
 }

 static int snd_opl3_timer1_stop(struct snd_timer * timer)
 {
 	unsigned long flags;
 	unsigned char tmp;
 	struct snd_opl3 *opl3;

 	opl3 = snd_timer_chip(timer);
 	spin_lock_irqsave(&opl3->timer_lock, flags);
 	tmp = (opl3->timer_enable | OPL3_TIMER1_MASK) & ~OPL3_TIMER1_START;
 	opl3->timer_enable = tmp;
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);	/* disable timer #1 */
 	spin_unlock_irqrestore(&opl3->timer_lock, flags);
 	return 0;
 }

 /*
  *  Timer 2 - 320us
  */

 static int snd_opl3_timer2_start(struct snd_timer * timer)
 {
 	unsigned long flags;
 	unsigned char tmp;
 	unsigned int ticks;
 	struct snd_opl3 *opl3;

 	opl3 = snd_timer_chip(timer);
 	spin_lock_irqsave(&opl3->timer_lock, flags);
 	ticks = timer->sticks;
 	tmp = (opl3->timer_enable | OPL3_TIMER2_START) & ~OPL3_TIMER2_MASK;
 	opl3->timer_enable = tmp;
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER2, 256 - ticks);	/* timer 1 count */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);	/* enable timer 1 IRQ */
 	spin_unlock_irqrestore(&opl3->timer_lock, flags);
 	return 0;
 }

 static int snd_opl3_timer2_stop(struct snd_timer * timer)
 {
 	unsigned long flags;
 	unsigned char tmp;
 	struct snd_opl3 *opl3;

 	opl3 = snd_timer_chip(timer);
 	spin_lock_irqsave(&opl3->timer_lock, flags);
 	tmp = (opl3->timer_enable | OPL3_TIMER2_MASK) & ~OPL3_TIMER2_START;
 	opl3->timer_enable = tmp;
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);	/* disable timer #1 */
 	spin_unlock_irqrestore(&opl3->timer_lock, flags);
 	return 0;
 }

 /*

  */

 static struct snd_timer_hardware snd_opl3_timer1 =
 {
 	.flags =	SNDRV_TIMER_HW_STOP,
 	.resolution =	80000,
 	.ticks =	256,
 	.start =	snd_opl3_timer1_start,
 	.stop =		snd_opl3_timer1_stop,
 };

 static struct snd_timer_hardware snd_opl3_timer2 =
 {
 	.flags =	SNDRV_TIMER_HW_STOP,
 	.resolution =	320000,
 	.ticks =	256,
 	.start =	snd_opl3_timer2_start,
 	.stop =		snd_opl3_timer2_stop,
 };

 static int snd_opl3_timer1_init(struct snd_opl3 * opl3, int timer_no)
 {
 	struct snd_timer *timer = NULL;
 	struct snd_timer_id tid;
 	int err;

 	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
 	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 	tid.card = opl3->card->number;
 	tid.device = timer_no;
 	tid.subdevice = 0;
 	if ((err = snd_timer_new(opl3->card, "AdLib timer #1", &tid, &timer)) >= 0) {
 		strcpy(timer->name, "AdLib timer #1");
 		timer->private_data = opl3;
 		timer->hw = snd_opl3_timer1;
 	}
 	opl3->timer1 = timer;
 	return err;
 }

 static int snd_opl3_timer2_init(struct snd_opl3 * opl3, int timer_no)
 {
 	struct snd_timer *timer = NULL;
 	struct snd_timer_id tid;
 	int err;

 	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
 	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 	tid.card = opl3->card->number;
 	tid.device = timer_no;
 	tid.subdevice = 0;
 	if ((err = snd_timer_new(opl3->card, "AdLib timer #2", &tid, &timer)) >= 0) {
 		strcpy(timer->name, "AdLib timer #2");
 		timer->private_data = opl3;
 		timer->hw = snd_opl3_timer2;
 	}
 	opl3->timer2 = timer;
 	return err;
 }

 /*

  */

 void snd_opl3_interrupt(struct snd_hwdep * hw)
 {
 	unsigned char status;
 	struct snd_opl3 *opl3;
 	struct snd_timer *timer;

 	if (hw == NULL)
 		return;

 	opl3 = hw->private_data;
 	status = inb(opl3->l_port);
 #if 0
 	snd_printk(KERN_DEBUG "AdLib IRQ status = 0x%x\n", status);
 #endif
 	if (!(status & 0x80))
 		return;

 	if (status & 0x40) {
 		timer = opl3->timer1;
 		snd_timer_interrupt(timer, timer->sticks);
 	}
 	if (status & 0x20) {
 		timer = opl3->timer2;
 		snd_timer_interrupt(timer, timer->sticks);
 	}
 }

 EXPORT_SYMBOL(snd_opl3_interrupt);

 /*

  */

 static int snd_opl3_free(struct snd_opl3 *opl3)
 {
 	if (snd_BUG_ON(!opl3))
 		return -ENXIO;
 	if (opl3->private_free)
 		opl3->private_free(opl3);
 	snd_opl3_clear_patches(opl3);
 	release_and_free_resource(opl3->res_l_port);
 	release_and_free_resource(opl3->res_r_port);
 	kfree(opl3);
 	return 0;
 }

 static int snd_opl3_dev_free(struct snd_device *device)
 {
 	struct snd_opl3 *opl3 = device->device_data;
 	return snd_opl3_free(opl3);
 }

 int snd_opl3_new(struct snd_card *card,
 		 unsigned short hardware,
 		 struct snd_opl3 **ropl3)
 {
 	static struct snd_device_ops ops = {
 		.dev_free = snd_opl3_dev_free,
 	};
 	struct snd_opl3 *opl3;
 	int err;

 	*ropl3 = NULL;
 	opl3 = kzalloc(sizeof(*opl3), GFP_KERNEL);
 	if (!opl3)
 		return -ENOMEM;

 	opl3->card = card;
 	opl3->hardware = hardware;
 	spin_lock_init(&opl3->reg_lock);
 	spin_lock_init(&opl3->timer_lock);

 	if ((err = snd_device_new(card, SNDRV_DEV_CODEC, opl3, &ops)) < 0) {
 		snd_opl3_free(opl3);
 		return err;
 	}

 	*ropl3 = opl3;
 	return 0;
 }

 EXPORT_SYMBOL(snd_opl3_new);

 int snd_opl3_init(struct snd_opl3 *opl3)
 {
 	if (! opl3->command) {
 		printk(KERN_ERR "snd_opl3_init: command not defined!\n");
 		return -EINVAL;
 	}

 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
 	/* Melodic mode */
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);

 	switch (opl3->hardware & OPL3_HW_MASK) {
 	case OPL3_HW_OPL2:
 		opl3->max_voices = MAX_OPL2_VOICES;
 		break;
 	case OPL3_HW_OPL3:
 	case OPL3_HW_OPL4:
 		opl3->max_voices = MAX_OPL3_VOICES;
 		/* Enter OPL3 mode */
 		opl3->command(opl3, OPL3_RIGHT | OPL3_REG_MODE, OPL3_OPL3_ENABLE);
 	}
 	return 0;
 }

 EXPORT_SYMBOL(snd_opl3_init);

 int snd_opl3_create(struct snd_card *card,
 		    unsigned long l_port,
 		    unsigned long r_port,
 		    unsigned short hardware,
 		    int integrated,
 		    struct snd_opl3 ** ropl3)
 {
 	struct snd_opl3 *opl3;
 	int err;

 	*ropl3 = NULL;
 	if ((err = snd_opl3_new(card, hardware, &opl3)) < 0)
 		return err;
 	if (! integrated) {
 		if ((opl3->res_l_port = request_region(l_port, 2, "OPL2/3 (left)")) == NULL) {
 			snd_printk(KERN_ERR "opl3: can't grab left port 0x%lx\n", l_port);
 			snd_device_free(card, opl3);
 			return -EBUSY;
 		}
 		if (r_port != 0 &&
 		    (opl3->res_r_port = request_region(r_port, 2, "OPL2/3 (right)")) == NULL) {
 			snd_printk(KERN_ERR "opl3: can't grab right port 0x%lx\n", r_port);
 			snd_device_free(card, opl3);
 			return -EBUSY;
 		}
 	}
 	opl3->l_port = l_port;
 	opl3->r_port = r_port;

 	switch (opl3->hardware) {
 	/* some hardware doesn't support timers */
 	case OPL3_HW_OPL3_SV:
 	case OPL3_HW_OPL3_CS:
 	case OPL3_HW_OPL3_FM801:
 		opl3->command = &snd_opl3_command;
 		break;
 	default:
 		opl3->command = &snd_opl2_command;
 		if ((err = snd_opl3_detect(opl3)) < 0) {
 			snd_printd("OPL2/3 chip not detected at 0x%lx/0x%lx\n",
 				   opl3->l_port, opl3->r_port);
 			snd_device_free(card, opl3);
 			return err;
 		}
 		/* detect routine returns correct hardware type */
 		switch (opl3->hardware & OPL3_HW_MASK) {
 		case OPL3_HW_OPL3:
 		case OPL3_HW_OPL4:
 			opl3->command = &snd_opl3_command;
 		}
 	}

 	snd_opl3_init(opl3);

 	*ropl3 = opl3;
 	return 0;
 }

 EXPORT_SYMBOL(snd_opl3_create);

 int snd_opl3_timer_new(struct snd_opl3 * opl3, int timer1_dev, int timer2_dev)
 {
 	int err;

 	if (timer1_dev >= 0)
 		if ((err = snd_opl3_timer1_init(opl3, timer1_dev)) < 0)
 			return err;
 	if (timer2_dev >= 0) {
 		if ((err = snd_opl3_timer2_init(opl3, timer2_dev)) < 0) {
 			snd_device_free(opl3->card, opl3->timer1);
 			opl3->timer1 = NULL;
 			return err;
 		}
 	}
 	return 0;
 }

 EXPORT_SYMBOL(snd_opl3_timer_new);

 int snd_opl3_hwdep_new(struct snd_opl3 * opl3,
 		       int device, int seq_device,
 		       struct snd_hwdep ** rhwdep)
 {
 	struct snd_hwdep *hw;
 	struct snd_card *card = opl3->card;
 	int err;

 	if (rhwdep)
 		*rhwdep = NULL;

 	/* create hardware dependent device (direct FM) */

 	if ((err = snd_hwdep_new(card, "OPL2/OPL3", device, &hw)) < 0) {
 		snd_device_free(card, opl3);
 		return err;
 	}
 	hw->private_data = opl3;
 	hw->exclusive = 1;
 #ifdef CONFIG_SND_OSSEMUL
 	if (device == 0)
 		hw->oss_type = SNDRV_OSS_DEVICE_TYPE_DMFM;
 #endif
 	strcpy(hw->name, hw->id);
 	switch (opl3->hardware & OPL3_HW_MASK) {
 	case OPL3_HW_OPL2:
 		strcpy(hw->name, "OPL2 FM");
 		hw->iface = SNDRV_HWDEP_IFACE_OPL2;
 		break;
 	case OPL3_HW_OPL3:
 		strcpy(hw->name, "OPL3 FM");
 		hw->iface = SNDRV_HWDEP_IFACE_OPL3;
 		break;
 	case OPL3_HW_OPL4:
 		strcpy(hw->name, "OPL4 FM");
 		hw->iface = SNDRV_HWDEP_IFACE_OPL4;
 		break;
 	}

 	/* operators - only ioctl */
 	hw->ops.open = snd_opl3_open;
 	hw->ops.ioctl = snd_opl3_ioctl;
 	hw->ops.write = snd_opl3_write;
 	hw->ops.release = snd_opl3_release;

 	opl3->hwdep = hw;
 	opl3->seq_dev_num = seq_device;
 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
 	if (snd_seq_device_new(card, seq_device, SNDRV_SEQ_DEV_ID_OPL3,
 			       sizeof(struct snd_opl3 *), &opl3->seq_dev) >= 0) {
 		strcpy(opl3->seq_dev->name, hw->name);
 		*(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(opl3->seq_dev) = opl3;
 	}
 #endif
 	if (rhwdep)
 		*rhwdep = hw;
 	return 0;
 }

 EXPORT_SYMBOL(snd_opl3_hwdep_new);

 /*
  *  INIT part
  */

 static int __init alsa_opl3_init(void)
 {
 	return 0;
 }

 static void __exit alsa_opl3_exit(void)
 {
 }

 module_init(alsa_opl3_init)
 module_exit(alsa_opl3_exit)
	/*
	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>,
	* Hannu Savolainen 1993-1996,
	* Rob Hooft
	*
	* Routines for control of AdLib FM cards (OPL2/OPL3/OPL4 chips)
	*
	* Most if code is ported from OSS/Lite.
	*
	* 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
	*
	*/

	#include <sound/opl3.h>
	#include <linux/io.h>
	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/ioport.h>
	#include <sound/minors.h>

	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Hannu Savolainen 1993-1996, Rob Hooft");
	MODULE_DESCRIPTION("Routines for control of AdLib FM cards (OPL2/OPL3/OPL4 chips)");
	MODULE_LICENSE("GPL");

	extern char snd_opl3_regmap[MAX_OPL2_VOICES][4];

	static void snd_opl2_command(struct snd_opl3 * opl3, unsigned short cmd, unsigned char val)
	{
	unsigned long flags;
	unsigned long port;

	/*
	* The original 2-OP synth requires a quite long delay
	* after writing to a register.
	*/

	port = (cmd & OPL3_RIGHT) ? opl3->r_port : opl3->l_port;

	spin_lock_irqsave(&opl3->reg_lock, flags);

	outb((unsigned char) cmd, port);
	udelay(10);

	outb((unsigned char) val, port + 1);
	udelay(30);

	spin_unlock_irqrestore(&opl3->reg_lock, flags);
	}

	static void snd_opl3_command(struct snd_opl3 * opl3, unsigned short cmd, unsigned char val)
	{
	unsigned long flags;
	unsigned long port;

	/*
	* The OPL-3 survives with just two INBs
	* after writing to a register.
	*/

	port = (cmd & OPL3_RIGHT) ? opl3->r_port : opl3->l_port;

	spin_lock_irqsave(&opl3->reg_lock, flags);

	outb((unsigned char) cmd, port);
	inb(opl3->l_port);
	inb(opl3->l_port);

	outb((unsigned char) val, port + 1);
	inb(opl3->l_port);
	inb(opl3->l_port);

	spin_unlock_irqrestore(&opl3->reg_lock, flags);
	}

	static int snd_opl3_detect(struct snd_opl3 * opl3)
	{
	/*
	* This function returns 1 if the FM chip is present at the given I/O port
	* The detection algorithm plays with the timer built in the FM chip and
	* looks for a change in the status register.
	*
	* Note! The timers of the FM chip are not connected to AdLib (and compatible)
	* boards.
	*
	* Note2! The chip is initialized if detected.
	*/

	unsigned char stat1, stat2, signature;

	/* Reset timers 1 and 2 */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, OPL3_TIMER1_MASK \| OPL3_TIMER2_MASK);
	/* Reset the IRQ of the FM chip */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, OPL3_IRQ_RESET);
	signature = stat1 = inb(opl3->l_port); /* Status register */
	if ((stat1 & 0xe0) != 0x00) { /* Should be 0x00 */
	snd_printd("OPL3: stat1 = 0x%x\n", stat1);
	return -ENODEV;
	}
	/* Set timer1 to 0xff */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER1, 0xff);
	/* Unmask and start timer 1 */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, OPL3_TIMER2_MASK \| OPL3_TIMER1_START);
	/* Now we have to delay at least 80us */
	udelay(200);
	/* Read status after timers have expired */
	stat2 = inb(opl3->l_port);
	/* Stop the timers */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, OPL3_TIMER1_MASK \| OPL3_TIMER2_MASK);
	/* Reset the IRQ of the FM chip */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, OPL3_IRQ_RESET);
	if ((stat2 & 0xe0) != 0xc0) { /* There is no YM3812 */
	snd_printd("OPL3: stat2 = 0x%x\n", stat2);
	return -ENODEV;
	}

	/* If the toplevel code knows exactly the type of chip, don't try
	to detect it. */
	if (opl3->hardware != OPL3_HW_AUTO)
	return 0;

	/* There is a FM chip on this address. Detect the type (OPL2 to OPL4) */
	if (signature == 0x06) { /* OPL2 */
	opl3->hardware = OPL3_HW_OPL2;
	} else {
	/*
	* If we had an OPL4 chip, opl3->hardware would have been set
	* by the OPL4 driver; so we can assume OPL3 here.
	*/
	if (snd_BUG_ON(!opl3->r_port))
	return -ENODEV;
	opl3->hardware = OPL3_HW_OPL3;
	}
	return 0;
	}

	/*
	* AdLib timers
	*/

	/*
	* Timer 1 - 80us
	*/

	static int snd_opl3_timer1_start(struct snd_timer * timer)
	{
	unsigned long flags;
	unsigned char tmp;
	unsigned int ticks;
	struct snd_opl3 *opl3;

	opl3 = snd_timer_chip(timer);
	spin_lock_irqsave(&opl3->timer_lock, flags);
	ticks = timer->sticks;
	tmp = (opl3->timer_enable \| OPL3_TIMER1_START) & ~OPL3_TIMER1_MASK;
	opl3->timer_enable = tmp;
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER1, 256 - ticks); /* timer 1 count */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, tmp); /* enable timer 1 IRQ */
	spin_unlock_irqrestore(&opl3->timer_lock, flags);
	return 0;
	}

	static int snd_opl3_timer1_stop(struct snd_timer * timer)
	{
	unsigned long flags;
	unsigned char tmp;
	struct snd_opl3 *opl3;

	opl3 = snd_timer_chip(timer);
	spin_lock_irqsave(&opl3->timer_lock, flags);
	tmp = (opl3->timer_enable \| OPL3_TIMER1_MASK) & ~OPL3_TIMER1_START;
	opl3->timer_enable = tmp;
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, tmp); /* disable timer #1 */
	spin_unlock_irqrestore(&opl3->timer_lock, flags);
	return 0;
	}

	/*
	* Timer 2 - 320us
	*/

	static int snd_opl3_timer2_start(struct snd_timer * timer)
	{
	unsigned long flags;
	unsigned char tmp;
	unsigned int ticks;
	struct snd_opl3 *opl3;

	opl3 = snd_timer_chip(timer);
	spin_lock_irqsave(&opl3->timer_lock, flags);
	ticks = timer->sticks;
	tmp = (opl3->timer_enable \| OPL3_TIMER2_START) & ~OPL3_TIMER2_MASK;
	opl3->timer_enable = tmp;
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER2, 256 - ticks); /* timer 1 count */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, tmp); /* enable timer 1 IRQ */
	spin_unlock_irqrestore(&opl3->timer_lock, flags);
	return 0;
	}

	static int snd_opl3_timer2_stop(struct snd_timer * timer)
	{
	unsigned long flags;
	unsigned char tmp;
	struct snd_opl3 *opl3;

	opl3 = snd_timer_chip(timer);
	spin_lock_irqsave(&opl3->timer_lock, flags);
	tmp = (opl3->timer_enable \| OPL3_TIMER2_MASK) & ~OPL3_TIMER2_START;
	opl3->timer_enable = tmp;
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TIMER_CONTROL, tmp); /* disable timer #1 */
	spin_unlock_irqrestore(&opl3->timer_lock, flags);
	return 0;
	}

	/*

	*/

	static struct snd_timer_hardware snd_opl3_timer1 =
	{
	.flags = SNDRV_TIMER_HW_STOP,
	.resolution = 80000,
	.ticks = 256,
	.start = snd_opl3_timer1_start,
	.stop = snd_opl3_timer1_stop,
	};

	static struct snd_timer_hardware snd_opl3_timer2 =
	{
	.flags = SNDRV_TIMER_HW_STOP,
	.resolution = 320000,
	.ticks = 256,
	.start = snd_opl3_timer2_start,
	.stop = snd_opl3_timer2_stop,
	};

	static int snd_opl3_timer1_init(struct snd_opl3 * opl3, int timer_no)
	{
	struct snd_timer *timer = NULL;
	struct snd_timer_id tid;
	int err;

	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
	tid.card = opl3->card->number;
	tid.device = timer_no;
	tid.subdevice = 0;
	if ((err = snd_timer_new(opl3->card, "AdLib timer #1", &tid, &timer)) >= 0) {
	strcpy(timer->name, "AdLib timer #1");
	timer->private_data = opl3;
	timer->hw = snd_opl3_timer1;
	}
	opl3->timer1 = timer;
	return err;
	}

	static int snd_opl3_timer2_init(struct snd_opl3 * opl3, int timer_no)
	{
	struct snd_timer *timer = NULL;
	struct snd_timer_id tid;
	int err;

	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
	tid.card = opl3->card->number;
	tid.device = timer_no;
	tid.subdevice = 0;
	if ((err = snd_timer_new(opl3->card, "AdLib timer #2", &tid, &timer)) >= 0) {
	strcpy(timer->name, "AdLib timer #2");
	timer->private_data = opl3;
	timer->hw = snd_opl3_timer2;
	}
	opl3->timer2 = timer;
	return err;
	}

	/*

	*/

	void snd_opl3_interrupt(struct snd_hwdep * hw)
	{
	unsigned char status;
	struct snd_opl3 *opl3;
	struct snd_timer *timer;

	if (hw == NULL)
	return;

	opl3 = hw->private_data;
	status = inb(opl3->l_port);
	#if 0
	snd_printk(KERN_DEBUG "AdLib IRQ status = 0x%x\n", status);
	#endif
	if (!(status & 0x80))
	return;

	if (status & 0x40) {
	timer = opl3->timer1;
	snd_timer_interrupt(timer, timer->sticks);
	}
	if (status & 0x20) {
	timer = opl3->timer2;
	snd_timer_interrupt(timer, timer->sticks);
	}
	}

	EXPORT_SYMBOL(snd_opl3_interrupt);

	/*

	*/

	static int snd_opl3_free(struct snd_opl3 *opl3)
	{
	if (snd_BUG_ON(!opl3))
	return -ENXIO;
	if (opl3->private_free)
	opl3->private_free(opl3);
	snd_opl3_clear_patches(opl3);
	release_and_free_resource(opl3->res_l_port);
	release_and_free_resource(opl3->res_r_port);
	kfree(opl3);
	return 0;
	}

	static int snd_opl3_dev_free(struct snd_device *device)
	{
	struct snd_opl3 *opl3 = device->device_data;
	return snd_opl3_free(opl3);
	}

	int snd_opl3_new(struct snd_card *card,
	unsigned short hardware,
	struct snd_opl3 **ropl3)
	{
	static struct snd_device_ops ops = {
	.dev_free = snd_opl3_dev_free,
	};
	struct snd_opl3 *opl3;
	int err;

	*ropl3 = NULL;
	opl3 = kzalloc(sizeof(*opl3), GFP_KERNEL);
	if (!opl3)
	return -ENOMEM;

	opl3->card = card;
	opl3->hardware = hardware;
	spin_lock_init(&opl3->reg_lock);
	spin_lock_init(&opl3->timer_lock);

	if ((err = snd_device_new(card, SNDRV_DEV_CODEC, opl3, &ops)) < 0) {
	snd_opl3_free(opl3);
	return err;
	}

	*ropl3 = opl3;
	return 0;
	}

	EXPORT_SYMBOL(snd_opl3_new);

	int snd_opl3_init(struct snd_opl3 *opl3)
	{
	if (! opl3->command) {
	printk(KERN_ERR "snd_opl3_init: command not defined!\n");
	return -EINVAL;
	}

	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
	/* Melodic mode */
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_PERCUSSION, 0x00);

	switch (opl3->hardware & OPL3_HW_MASK) {
	case OPL3_HW_OPL2:
	opl3->max_voices = MAX_OPL2_VOICES;
	break;
	case OPL3_HW_OPL3:
	case OPL3_HW_OPL4:
	opl3->max_voices = MAX_OPL3_VOICES;
	/* Enter OPL3 mode */
	opl3->command(opl3, OPL3_RIGHT \| OPL3_REG_MODE, OPL3_OPL3_ENABLE);
	}
	return 0;
	}

	EXPORT_SYMBOL(snd_opl3_init);

	int snd_opl3_create(struct snd_card *card,
	unsigned long l_port,
	unsigned long r_port,
	unsigned short hardware,
	int integrated,
	struct snd_opl3 ** ropl3)
	{
	struct snd_opl3 *opl3;
	int err;

	*ropl3 = NULL;
	if ((err = snd_opl3_new(card, hardware, &opl3)) < 0)
	return err;
	if (! integrated) {
	if ((opl3->res_l_port = request_region(l_port, 2, "OPL2/3 (left)")) == NULL) {
	snd_printk(KERN_ERR "opl3: can't grab left port 0x%lx\n", l_port);
	snd_device_free(card, opl3);
	return -EBUSY;
	}
	if (r_port != 0 &&
	(opl3->res_r_port = request_region(r_port, 2, "OPL2/3 (right)")) == NULL) {
	snd_printk(KERN_ERR "opl3: can't grab right port 0x%lx\n", r_port);
	snd_device_free(card, opl3);
	return -EBUSY;
	}
	}
	opl3->l_port = l_port;
	opl3->r_port = r_port;

	switch (opl3->hardware) {
	/* some hardware doesn't support timers */
	case OPL3_HW_OPL3_SV:
	case OPL3_HW_OPL3_CS:
	case OPL3_HW_OPL3_FM801:
	opl3->command = &snd_opl3_command;
	break;
	default:
	opl3->command = &snd_opl2_command;
	if ((err = snd_opl3_detect(opl3)) < 0) {
	snd_printd("OPL2/3 chip not detected at 0x%lx/0x%lx\n",
	opl3->l_port, opl3->r_port);
	snd_device_free(card, opl3);
	return err;
	}
	/* detect routine returns correct hardware type */
	switch (opl3->hardware & OPL3_HW_MASK) {
	case OPL3_HW_OPL3:
	case OPL3_HW_OPL4:
	opl3->command = &snd_opl3_command;
	}
	}

	snd_opl3_init(opl3);

	*ropl3 = opl3;
	return 0;
	}

	EXPORT_SYMBOL(snd_opl3_create);

	int snd_opl3_timer_new(struct snd_opl3 * opl3, int timer1_dev, int timer2_dev)
	{
	int err;

	if (timer1_dev >= 0)
	if ((err = snd_opl3_timer1_init(opl3, timer1_dev)) < 0)
	return err;
	if (timer2_dev >= 0) {
	if ((err = snd_opl3_timer2_init(opl3, timer2_dev)) < 0) {
	snd_device_free(opl3->card, opl3->timer1);
	opl3->timer1 = NULL;
	return err;
	}
	}
	return 0;
	}

	EXPORT_SYMBOL(snd_opl3_timer_new);

	int snd_opl3_hwdep_new(struct snd_opl3 * opl3,
	int device, int seq_device,
	struct snd_hwdep ** rhwdep)
	{
	struct snd_hwdep *hw;
	struct snd_card *card = opl3->card;
	int err;

	if (rhwdep)
	*rhwdep = NULL;

	/* create hardware dependent device (direct FM) */

	if ((err = snd_hwdep_new(card, "OPL2/OPL3", device, &hw)) < 0) {
	snd_device_free(card, opl3);
	return err;
	}
	hw->private_data = opl3;
	hw->exclusive = 1;
	#ifdef CONFIG_SND_OSSEMUL
	if (device == 0)
	hw->oss_type = SNDRV_OSS_DEVICE_TYPE_DMFM;
	#endif
	strcpy(hw->name, hw->id);
	switch (opl3->hardware & OPL3_HW_MASK) {
	case OPL3_HW_OPL2:
	strcpy(hw->name, "OPL2 FM");
	hw->iface = SNDRV_HWDEP_IFACE_OPL2;
	break;
	case OPL3_HW_OPL3:
	strcpy(hw->name, "OPL3 FM");
	hw->iface = SNDRV_HWDEP_IFACE_OPL3;
	break;
	case OPL3_HW_OPL4:
	strcpy(hw->name, "OPL4 FM");
	hw->iface = SNDRV_HWDEP_IFACE_OPL4;
	break;
	}

	/* operators - only ioctl */
	hw->ops.open = snd_opl3_open;
	hw->ops.ioctl = snd_opl3_ioctl;
	hw->ops.write = snd_opl3_write;
	hw->ops.release = snd_opl3_release;

	opl3->hwdep = hw;
	opl3->seq_dev_num = seq_device;
	#if IS_ENABLED(CONFIG_SND_SEQUENCER)
	if (snd_seq_device_new(card, seq_device, SNDRV_SEQ_DEV_ID_OPL3,
	sizeof(struct snd_opl3 *), &opl3->seq_dev) >= 0) {
	strcpy(opl3->seq_dev->name, hw->name);
	(struct snd_opl3 *)SNDRV_SEQ_DEVICE_ARGPTR(opl3->seq_dev) = opl3;
	}
	#endif
	if (rhwdep)
	*rhwdep = hw;
	return 0;
	}

	EXPORT_SYMBOL(snd_opl3_hwdep_new);

	/*
	* INIT part
	*/

	static int __init alsa_opl3_init(void)
	{
	return 0;
	}

	static void __exit alsa_opl3_exit(void)
	{
	}

	module_init(alsa_opl3_init)
	module_exit(alsa_opl3_exit)