sound/oss/msnd.c - kernel/quantenna - Git at Google

 /*********************************************************************
  *
  * msnd.c - Driver Base
  *
  * Turtle Beach MultiSound Sound Card Driver for Linux
  *
  * Copyright (C) 1998 Andrew Veliath
  *
  * 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 <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/vmalloc.h>
 #include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>

 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <linux/spinlock.h>
 #include <asm/irq.h>
 #include "msnd.h"

 #define LOGNAME			"msnd"

 #define MSND_MAX_DEVS		4

 static multisound_dev_t		*devs[MSND_MAX_DEVS];
 static int			num_devs;

 int msnd_register(multisound_dev_t *dev)
 {
 	int i;

 	for (i = 0; i < MSND_MAX_DEVS; ++i)
 		if (devs[i] == NULL)
 			break;

 	if (i == MSND_MAX_DEVS)
 		return -ENOMEM;

 	devs[i] = dev;
 	++num_devs;
 	return 0;
 }

 void msnd_unregister(multisound_dev_t *dev)
 {
 	int i;

 	for (i = 0; i < MSND_MAX_DEVS; ++i)
 		if (devs[i] == dev)
 			break;

 	if (i == MSND_MAX_DEVS) {
 		printk(KERN_WARNING LOGNAME ": Unregistering unknown device\n");
 		return;
 	}

 	devs[i] = NULL;
 	--num_devs;
 }

 void msnd_init_queue(void __iomem *base, int start, int size)
 {
 	writew(PCTODSP_BASED(start), base + JQS_wStart);
 	writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
 	writew(0, base + JQS_wHead);
 	writew(0, base + JQS_wTail);
 }

 void msnd_fifo_init(msnd_fifo *f)
 {
 	f->data = NULL;
 }

 void msnd_fifo_free(msnd_fifo *f)
 {
 	vfree(f->data);
 	f->data = NULL;
 }

 int msnd_fifo_alloc(msnd_fifo *f, size_t n)
 {
 	msnd_fifo_free(f);
 	f->data = vmalloc(n);
 	f->n = n;
 	f->tail = 0;
 	f->head = 0;
 	f->len = 0;

 	if (!f->data)
 		return -ENOMEM;

 	return 0;
 }

 void msnd_fifo_make_empty(msnd_fifo *f)
 {
 	f->len = f->tail = f->head = 0;
 }

 int msnd_fifo_write_io(msnd_fifo *f, char __iomem *buf, size_t len)
 {
 	int count = 0;

 	while ((count < len) && (f->len != f->n)) {

 		int nwritten;

 		if (f->head <= f->tail) {
 			nwritten = len - count;
 			if (nwritten > f->n - f->tail)
 				nwritten = f->n - f->tail;
 		}
 		else {
 			nwritten = f->head - f->tail;
 			if (nwritten > len - count)
 				nwritten = len - count;
 		}

 		memcpy_fromio(f->data + f->tail, buf, nwritten);

 		count += nwritten;
 		buf += nwritten;
 		f->len += nwritten;
 		f->tail += nwritten;
 		f->tail %= f->n;
 	}

 	return count;
 }

 int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len)
 {
 	int count = 0;

 	while ((count < len) && (f->len != f->n)) {

 		int nwritten;

 		if (f->head <= f->tail) {
 			nwritten = len - count;
 			if (nwritten > f->n - f->tail)
 				nwritten = f->n - f->tail;
 		}
 		else {
 			nwritten = f->head - f->tail;
 			if (nwritten > len - count)
 				nwritten = len - count;
 		}

 		memcpy(f->data + f->tail, buf, nwritten);

 		count += nwritten;
 		buf += nwritten;
 		f->len += nwritten;
 		f->tail += nwritten;
 		f->tail %= f->n;
 	}

 	return count;
 }

 int msnd_fifo_read_io(msnd_fifo *f, char __iomem *buf, size_t len)
 {
 	int count = 0;

 	while ((count < len) && (f->len > 0)) {

 		int nread;

 		if (f->tail <= f->head) {
 			nread = len - count;
 			if (nread > f->n - f->head)
 				nread = f->n - f->head;
 		}
 		else {
 			nread = f->tail - f->head;
 			if (nread > len - count)
 				nread = len - count;
 		}

 		memcpy_toio(buf, f->data + f->head, nread);

 		count += nread;
 		buf += nread;
 		f->len -= nread;
 		f->head += nread;
 		f->head %= f->n;
 	}

 	return count;
 }

 int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len)
 {
 	int count = 0;

 	while ((count < len) && (f->len > 0)) {

 		int nread;

 		if (f->tail <= f->head) {
 			nread = len - count;
 			if (nread > f->n - f->head)
 				nread = f->n - f->head;
 		}
 		else {
 			nread = f->tail - f->head;
 			if (nread > len - count)
 				nread = len - count;
 		}

 		memcpy(buf, f->data + f->head, nread);

 		count += nread;
 		buf += nread;
 		f->len -= nread;
 		f->head += nread;
 		f->head %= f->n;
 	}

 	return count;
 }

 static int msnd_wait_TXDE(multisound_dev_t *dev)
 {
 	register unsigned int io = dev->io;
 	register int timeout = 1000;

 	while(timeout-- > 0)
 		if (msnd_inb(io + HP_ISR) & HPISR_TXDE)
 			return 0;

 	return -EIO;
 }

 static int msnd_wait_HC0(multisound_dev_t *dev)
 {
 	register unsigned int io = dev->io;
 	register int timeout = 1000;

 	while(timeout-- > 0)
 		if (!(msnd_inb(io + HP_CVR) & HPCVR_HC))
 			return 0;

 	return -EIO;
 }

 int msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&dev->lock, flags);
 	if (msnd_wait_HC0(dev) == 0) {
 		msnd_outb(cmd, dev->io + HP_CVR);
 		spin_unlock_irqrestore(&dev->lock, flags);
 		return 0;
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);

 	printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");

 	return -EIO;
 }

 int msnd_send_word(multisound_dev_t *dev, unsigned char high,
 		   unsigned char mid, unsigned char low)
 {
 	register unsigned int io = dev->io;

 	if (msnd_wait_TXDE(dev) == 0) {
 		msnd_outb(high, io + HP_TXH);
 		msnd_outb(mid, io + HP_TXM);
 		msnd_outb(low, io + HP_TXL);
 		return 0;
 	}

 	printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");

 	return -EIO;
 }

 int msnd_upload_host(multisound_dev_t *dev, char *bin, int len)
 {
 	int i;

 	if (len % 3 != 0) {
 		printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");
 		return -EINVAL;
 	}

 	for (i = 0; i < len; i += 3)
 		if (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
 			return -EIO;

 	msnd_inb(dev->io + HP_RXL);
 	msnd_inb(dev->io + HP_CVR);

 	return 0;
 }

 int msnd_enable_irq(multisound_dev_t *dev)
 {
 	unsigned long flags;

 	if (dev->irq_ref++)
 		return 0;

 	printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");

 	spin_lock_irqsave(&dev->lock, flags);
 	if (msnd_wait_TXDE(dev) == 0) {
 		msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
 		if (dev->type == msndClassic)
 			msnd_outb(dev->irqid, dev->io + HP_IRQM);
 		msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
 		msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
 		enable_irq(dev->irq);
 		msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
 		spin_unlock_irqrestore(&dev->lock, flags);
 		return 0;
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);

 	printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");

 	return -EIO;
 }

 int msnd_disable_irq(multisound_dev_t *dev)
 {
 	unsigned long flags;

 	if (--dev->irq_ref > 0)
 		return 0;

 	if (dev->irq_ref < 0)
 		printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);

 	printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");

 	spin_lock_irqsave(&dev->lock, flags);
 	if (msnd_wait_TXDE(dev) == 0) {
 		msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
 		if (dev->type == msndClassic)
 			msnd_outb(HPIRQ_NONE, dev->io + HP_IRQM);
 		disable_irq(dev->irq);
 		spin_unlock_irqrestore(&dev->lock, flags);
 		return 0;
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);

 	printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");

 	return -EIO;
 }

 #ifndef LINUX20
 EXPORT_SYMBOL(msnd_register);
 EXPORT_SYMBOL(msnd_unregister);

 EXPORT_SYMBOL(msnd_init_queue);

 EXPORT_SYMBOL(msnd_fifo_init);
 EXPORT_SYMBOL(msnd_fifo_free);
 EXPORT_SYMBOL(msnd_fifo_alloc);
 EXPORT_SYMBOL(msnd_fifo_make_empty);
 EXPORT_SYMBOL(msnd_fifo_write_io);
 EXPORT_SYMBOL(msnd_fifo_read_io);
 EXPORT_SYMBOL(msnd_fifo_write);
 EXPORT_SYMBOL(msnd_fifo_read);

 EXPORT_SYMBOL(msnd_send_dsp_cmd);
 EXPORT_SYMBOL(msnd_send_word);
 EXPORT_SYMBOL(msnd_upload_host);

 EXPORT_SYMBOL(msnd_enable_irq);
 EXPORT_SYMBOL(msnd_disable_irq);
 #endif

 #ifdef MODULE
 MODULE_AUTHOR				("Andrew Veliath <andrewtv@usa.net>");
 MODULE_DESCRIPTION			("Turtle Beach MultiSound Driver Base");
 MODULE_LICENSE("GPL");


 int init_module(void)
 {
 	return 0;
 }

 void cleanup_module(void)
 {
 }
 #endif
	/*********************************************************************
	*
	* msnd.c - Driver Base
	*
	* Turtle Beach MultiSound Sound Card Driver for Linux
	*
	* Copyright (C) 1998 Andrew Veliath
	*
	* 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 <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/vmalloc.h>
	#include <linux/types.h>
	#include <linux/delay.h>
	#include <linux/mm.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>

	#include <asm/io.h>
	#include <asm/uaccess.h>
	#include <linux/spinlock.h>
	#include <asm/irq.h>
	#include "msnd.h"

	#define LOGNAME "msnd"

	#define MSND_MAX_DEVS 4

	static multisound_dev_t *devs[MSND_MAX_DEVS];
	static int num_devs;

	int msnd_register(multisound_dev_t *dev)
	{
	int i;

	for (i = 0; i < MSND_MAX_DEVS; ++i)
	if (devs[i] == NULL)
	break;

	if (i == MSND_MAX_DEVS)
	return -ENOMEM;

	devs[i] = dev;
	++num_devs;
	return 0;
	}

	void msnd_unregister(multisound_dev_t *dev)
	{
	int i;

	for (i = 0; i < MSND_MAX_DEVS; ++i)
	if (devs[i] == dev)
	break;

	if (i == MSND_MAX_DEVS) {
	printk(KERN_WARNING LOGNAME ": Unregistering unknown device\n");
	return;
	}

	devs[i] = NULL;
	--num_devs;
	}

	void msnd_init_queue(void __iomem *base, int start, int size)
	{
	writew(PCTODSP_BASED(start), base + JQS_wStart);
	writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
	writew(0, base + JQS_wHead);
	writew(0, base + JQS_wTail);
	}

	void msnd_fifo_init(msnd_fifo *f)
	{
	f->data = NULL;
	}

	void msnd_fifo_free(msnd_fifo *f)
	{
	vfree(f->data);
	f->data = NULL;
	}

	int msnd_fifo_alloc(msnd_fifo *f, size_t n)
	{
	msnd_fifo_free(f);
	f->data = vmalloc(n);
	f->n = n;
	f->tail = 0;
	f->head = 0;
	f->len = 0;

	if (!f->data)
	return -ENOMEM;

	return 0;
	}

	void msnd_fifo_make_empty(msnd_fifo *f)
	{
	f->len = f->tail = f->head = 0;
	}

	int msnd_fifo_write_io(msnd_fifo f, char __iomem buf, size_t len)
	{
	int count = 0;

	while ((count < len) && (f->len != f->n)) {

	int nwritten;

	if (f->head <= f->tail) {
	nwritten = len - count;
	if (nwritten > f->n - f->tail)
	nwritten = f->n - f->tail;
	}
	else {
	nwritten = f->head - f->tail;
	if (nwritten > len - count)
	nwritten = len - count;
	}

	memcpy_fromio(f->data + f->tail, buf, nwritten);

	count += nwritten;
	buf += nwritten;
	f->len += nwritten;
	f->tail += nwritten;
	f->tail %= f->n;
	}

	return count;
	}

	int msnd_fifo_write(msnd_fifo f, const char buf, size_t len)
	{
	int count = 0;

	while ((count < len) && (f->len != f->n)) {

	int nwritten;

	if (f->head <= f->tail) {
	nwritten = len - count;
	if (nwritten > f->n - f->tail)
	nwritten = f->n - f->tail;
	}
	else {
	nwritten = f->head - f->tail;
	if (nwritten > len - count)
	nwritten = len - count;
	}

	memcpy(f->data + f->tail, buf, nwritten);

	count += nwritten;
	buf += nwritten;
	f->len += nwritten;
	f->tail += nwritten;
	f->tail %= f->n;
	}

	return count;
	}

	int msnd_fifo_read_io(msnd_fifo f, char __iomem buf, size_t len)
	{
	int count = 0;

	while ((count < len) && (f->len > 0)) {

	int nread;

	if (f->tail <= f->head) {
	nread = len - count;
	if (nread > f->n - f->head)
	nread = f->n - f->head;
	}
	else {
	nread = f->tail - f->head;
	if (nread > len - count)
	nread = len - count;
	}

	memcpy_toio(buf, f->data + f->head, nread);

	count += nread;
	buf += nread;
	f->len -= nread;
	f->head += nread;
	f->head %= f->n;
	}

	return count;
	}

	int msnd_fifo_read(msnd_fifo f, char buf, size_t len)
	{
	int count = 0;

	while ((count < len) && (f->len > 0)) {

	int nread;

	if (f->tail <= f->head) {
	nread = len - count;
	if (nread > f->n - f->head)
	nread = f->n - f->head;
	}
	else {
	nread = f->tail - f->head;
	if (nread > len - count)
	nread = len - count;
	}

	memcpy(buf, f->data + f->head, nread);

	count += nread;
	buf += nread;
	f->len -= nread;
	f->head += nread;
	f->head %= f->n;
	}

	return count;
	}

	static int msnd_wait_TXDE(multisound_dev_t *dev)
	{
	register unsigned int io = dev->io;
	register int timeout = 1000;

	while(timeout-- > 0)
	if (msnd_inb(io + HP_ISR) & HPISR_TXDE)
	return 0;

	return -EIO;
	}

	static int msnd_wait_HC0(multisound_dev_t *dev)
	{
	register unsigned int io = dev->io;
	register int timeout = 1000;

	while(timeout-- > 0)
	if (!(msnd_inb(io + HP_CVR) & HPCVR_HC))
	return 0;

	return -EIO;
	}

	int msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
	{
	unsigned long flags;

	spin_lock_irqsave(&dev->lock, flags);
	if (msnd_wait_HC0(dev) == 0) {
	msnd_outb(cmd, dev->io + HP_CVR);
	spin_unlock_irqrestore(&dev->lock, flags);
	return 0;
	}
	spin_unlock_irqrestore(&dev->lock, flags);

	printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");

	return -EIO;
	}

	int msnd_send_word(multisound_dev_t *dev, unsigned char high,
	unsigned char mid, unsigned char low)
	{
	register unsigned int io = dev->io;

	if (msnd_wait_TXDE(dev) == 0) {
	msnd_outb(high, io + HP_TXH);
	msnd_outb(mid, io + HP_TXM);
	msnd_outb(low, io + HP_TXL);
	return 0;
	}

	printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");

	return -EIO;
	}

	int msnd_upload_host(multisound_dev_t dev, char bin, int len)
	{
	int i;

	if (len % 3 != 0) {
	printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");
	return -EINVAL;
	}

	for (i = 0; i < len; i += 3)
	if (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
	return -EIO;

	msnd_inb(dev->io + HP_RXL);
	msnd_inb(dev->io + HP_CVR);

	return 0;
	}

	int msnd_enable_irq(multisound_dev_t *dev)
	{
	unsigned long flags;

	if (dev->irq_ref++)
	return 0;

	printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");

	spin_lock_irqsave(&dev->lock, flags);
	if (msnd_wait_TXDE(dev) == 0) {
	msnd_outb(msnd_inb(dev->io + HP_ICR) \| HPICR_TREQ, dev->io + HP_ICR);
	if (dev->type == msndClassic)
	msnd_outb(dev->irqid, dev->io + HP_IRQM);
	msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
	msnd_outb(msnd_inb(dev->io + HP_ICR) \| HPICR_RREQ, dev->io + HP_ICR);
	enable_irq(dev->irq);
	msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
	spin_unlock_irqrestore(&dev->lock, flags);
	return 0;
	}
	spin_unlock_irqrestore(&dev->lock, flags);

	printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");

	return -EIO;
	}

	int msnd_disable_irq(multisound_dev_t *dev)
	{
	unsigned long flags;

	if (--dev->irq_ref > 0)
	return 0;

	if (dev->irq_ref < 0)
	printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);

	printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");

	spin_lock_irqsave(&dev->lock, flags);
	if (msnd_wait_TXDE(dev) == 0) {
	msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
	if (dev->type == msndClassic)
	msnd_outb(HPIRQ_NONE, dev->io + HP_IRQM);
	disable_irq(dev->irq);
	spin_unlock_irqrestore(&dev->lock, flags);
	return 0;
	}
	spin_unlock_irqrestore(&dev->lock, flags);

	printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");

	return -EIO;
	}

	#ifndef LINUX20
	EXPORT_SYMBOL(msnd_register);
	EXPORT_SYMBOL(msnd_unregister);

	EXPORT_SYMBOL(msnd_init_queue);

	EXPORT_SYMBOL(msnd_fifo_init);
	EXPORT_SYMBOL(msnd_fifo_free);
	EXPORT_SYMBOL(msnd_fifo_alloc);
	EXPORT_SYMBOL(msnd_fifo_make_empty);
	EXPORT_SYMBOL(msnd_fifo_write_io);
	EXPORT_SYMBOL(msnd_fifo_read_io);
	EXPORT_SYMBOL(msnd_fifo_write);
	EXPORT_SYMBOL(msnd_fifo_read);

	EXPORT_SYMBOL(msnd_send_dsp_cmd);
	EXPORT_SYMBOL(msnd_send_word);
	EXPORT_SYMBOL(msnd_upload_host);

	EXPORT_SYMBOL(msnd_enable_irq);
	EXPORT_SYMBOL(msnd_disable_irq);
	#endif

	#ifdef MODULE
	MODULE_AUTHOR ("Andrew Veliath <andrewtv@usa.net>");
	MODULE_DESCRIPTION ("Turtle Beach MultiSound Driver Base");
	MODULE_LICENSE("GPL");


	int init_module(void)
	{
	return 0;
	}

	void cleanup_module(void)
	{
	}
	#endif