sound/isa/msnd/msnd.c - linux - Git at Google

 /*********************************************************************
  *
  * 2002/06/30 Karsten Wiese:
  *	removed kernel-version dependencies.
  *	ripped from linux kernel 2.4.18 (OSS Implementation) by me.
  *	In the OSS Version, this file is compiled to a separate MODULE,
  *	that is used by the pinnacle and the classic driver.
  *	since there is no classic driver for alsa yet (i dont have a classic
  *	& writing one blindfold is difficult) this file's object is statically
  *	linked into the pinnacle-driver-module for now.	look for the string
  *		"uncomment this to make this a module again"
  *	to do guess what.
  *
  * the following is a copy of the 2.4.18 OSS FREE file-heading comment:
  *
  * 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/kernel.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/fs.h>
 #include <linux/delay.h>
 #include <linux/module.h>

 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>

 #include "msnd.h"

 #define LOGNAME			"msnd"


 void snd_msnd_init_queue(void *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);
 }
 EXPORT_SYMBOL(snd_msnd_init_queue);

 static int snd_msnd_wait_TXDE(struct snd_msnd *dev)
 {
 	unsigned int io = dev->io;
 	int timeout = 1000;

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

 	return -EIO;
 }

 static int snd_msnd_wait_HC0(struct snd_msnd *dev)
 {
 	unsigned int io = dev->io;
 	int timeout = 1000;

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

 	return -EIO;
 }

 int snd_msnd_send_dsp_cmd(struct snd_msnd *dev, u8 cmd)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&dev->lock, flags);
 	if (snd_msnd_wait_HC0(dev) == 0) {
 		outb(cmd, dev->io + HP_CVR);
 		spin_unlock_irqrestore(&dev->lock, flags);
 		return 0;
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);

 	snd_printd(KERN_ERR LOGNAME ": Send DSP command timeout\n");

 	return -EIO;
 }
 EXPORT_SYMBOL(snd_msnd_send_dsp_cmd);

 int snd_msnd_send_word(struct snd_msnd *dev, unsigned char high,
 		   unsigned char mid, unsigned char low)
 {
 	unsigned int io = dev->io;

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

 	snd_printd(KERN_ERR LOGNAME ": Send host word timeout\n");

 	return -EIO;
 }
 EXPORT_SYMBOL(snd_msnd_send_word);

 int snd_msnd_upload_host(struct snd_msnd *dev, const u8 *bin, int len)
 {
 	int i;

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

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

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

 	return 0;
 }
 EXPORT_SYMBOL(snd_msnd_upload_host);

 int snd_msnd_enable_irq(struct snd_msnd *dev)
 {
 	unsigned long flags;

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

 	snd_printdd(LOGNAME ": Enabling IRQ\n");

 	spin_lock_irqsave(&dev->lock, flags);
 	if (snd_msnd_wait_TXDE(dev) == 0) {
 		outb(inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
 		if (dev->type == msndClassic)
 			outb(dev->irqid, dev->io + HP_IRQM);

 		outb(inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
 		outb(inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
 		enable_irq(dev->irq);
 		snd_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);

 	snd_printd(KERN_ERR LOGNAME ": Enable IRQ failed\n");

 	return -EIO;
 }
 EXPORT_SYMBOL(snd_msnd_enable_irq);

 int snd_msnd_disable_irq(struct snd_msnd *dev)
 {
 	unsigned long flags;

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

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

 	snd_printdd(LOGNAME ": Disabling IRQ\n");

 	spin_lock_irqsave(&dev->lock, flags);
 	if (snd_msnd_wait_TXDE(dev) == 0) {
 		outb(inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
 		if (dev->type == msndClassic)
 			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);

 	snd_printd(KERN_ERR LOGNAME ": Disable IRQ failed\n");

 	return -EIO;
 }
 EXPORT_SYMBOL(snd_msnd_disable_irq);

 static inline long get_play_delay_jiffies(struct snd_msnd *chip, long size)
 {
 	long tmp = (size * HZ * chip->play_sample_size) / 8;
 	return tmp / (chip->play_sample_rate * chip->play_channels);
 }

 static void snd_msnd_dsp_write_flush(struct snd_msnd *chip)
 {
 	if (!(chip->mode & FMODE_WRITE) || !test_bit(F_WRITING, &chip->flags))
 		return;
 	set_bit(F_WRITEFLUSH, &chip->flags);
 /*	interruptible_sleep_on_timeout(
 		&chip->writeflush,
 		get_play_delay_jiffies(&chip, chip->DAPF.len));*/
 	clear_bit(F_WRITEFLUSH, &chip->flags);
 	if (!signal_pending(current))
 		schedule_timeout_interruptible(
 			get_play_delay_jiffies(chip, chip->play_period_bytes));
 	clear_bit(F_WRITING, &chip->flags);
 }

 void snd_msnd_dsp_halt(struct snd_msnd *chip, struct file *file)
 {
 	if ((file ? file->f_mode : chip->mode) & FMODE_READ) {
 		clear_bit(F_READING, &chip->flags);
 		snd_msnd_send_dsp_cmd(chip, HDEX_RECORD_STOP);
 		snd_msnd_disable_irq(chip);
 		if (file) {
 			snd_printd(KERN_INFO LOGNAME
 				   ": Stopping read for %p\n", file);
 			chip->mode &= ~FMODE_READ;
 		}
 		clear_bit(F_AUDIO_READ_INUSE, &chip->flags);
 	}
 	if ((file ? file->f_mode : chip->mode) & FMODE_WRITE) {
 		if (test_bit(F_WRITING, &chip->flags)) {
 			snd_msnd_dsp_write_flush(chip);
 			snd_msnd_send_dsp_cmd(chip, HDEX_PLAY_STOP);
 		}
 		snd_msnd_disable_irq(chip);
 		if (file) {
 			snd_printd(KERN_INFO
 				   LOGNAME ": Stopping write for %p\n", file);
 			chip->mode &= ~FMODE_WRITE;
 		}
 		clear_bit(F_AUDIO_WRITE_INUSE, &chip->flags);
 	}
 }
 EXPORT_SYMBOL(snd_msnd_dsp_halt);


 int snd_msnd_DARQ(struct snd_msnd *chip, int bank)
 {
 	int /*size, n,*/ timeout = 3;
 	u16 wTmp;
 	/* void *DAQD; */

 	/* Increment the tail and check for queue wrap */
 	wTmp = readw(chip->DARQ + JQS_wTail) + PCTODSP_OFFSET(DAQDS__size);
 	if (wTmp > readw(chip->DARQ + JQS_wSize))
 		wTmp = 0;
 	while (wTmp == readw(chip->DARQ + JQS_wHead) && timeout--)
 		udelay(1);

 	if (chip->capturePeriods == 2) {
 		void *pDAQ = chip->mappedbase + DARQ_DATA_BUFF +
 			     bank * DAQDS__size + DAQDS_wStart;
 		unsigned short offset = 0x3000 + chip->capturePeriodBytes;

 		if (readw(pDAQ) != PCTODSP_BASED(0x3000))
 			offset = 0x3000;
 		writew(PCTODSP_BASED(offset), pDAQ);
 	}

 	writew(wTmp, chip->DARQ + JQS_wTail);

 #if 0
 	/* Get our digital audio queue struct */
 	DAQD = bank * DAQDS__size + chip->mappedbase + DARQ_DATA_BUFF;

 	/* Get length of data */
 	size = readw(DAQD + DAQDS_wSize);

 	/* Read data from the head (unprotected bank 1 access okay
 	   since this is only called inside an interrupt) */
 	outb(HPBLKSEL_1, chip->io + HP_BLKS);
 	n = msnd_fifo_write(&chip->DARF,
 			    (char *)(chip->base + bank * DAR_BUFF_SIZE),
 			    size, 0);
 	if (n <= 0) {
 		outb(HPBLKSEL_0, chip->io + HP_BLKS);
 		return n;
 	}
 	outb(HPBLKSEL_0, chip->io + HP_BLKS);
 #endif

 	return 1;
 }
 EXPORT_SYMBOL(snd_msnd_DARQ);

 int snd_msnd_DAPQ(struct snd_msnd *chip, int start)
 {
 	u16	DAPQ_tail;
 	int	protect = start, nbanks = 0;
 	void	*DAQD;
 	static int play_banks_submitted;
 	/* unsigned long flags;
 	spin_lock_irqsave(&chip->lock, flags); not necessary */

 	DAPQ_tail = readw(chip->DAPQ + JQS_wTail);
 	while (DAPQ_tail != readw(chip->DAPQ + JQS_wHead) || start) {
 		int bank_num = DAPQ_tail / PCTODSP_OFFSET(DAQDS__size);

 		if (start) {
 			start = 0;
 			play_banks_submitted = 0;
 		}

 		/* Get our digital audio queue struct */
 		DAQD = bank_num * DAQDS__size + chip->mappedbase +
 			DAPQ_DATA_BUFF;

 		/* Write size of this bank */
 		writew(chip->play_period_bytes, DAQD + DAQDS_wSize);
 		if (play_banks_submitted < 3)
 			++play_banks_submitted;
 		else if (chip->playPeriods == 2) {
 			unsigned short offset = chip->play_period_bytes;

 			if (readw(DAQD + DAQDS_wStart) != PCTODSP_BASED(0x0))
 				offset = 0;

 			writew(PCTODSP_BASED(offset), DAQD + DAQDS_wStart);
 		}
 		++nbanks;

 		/* Then advance the tail */
 		/*
 		if (protect)
 			snd_printd(KERN_INFO "B %X %lX\n",
 				   bank_num, xtime.tv_usec);
 		*/

 		DAPQ_tail = (++bank_num % 3) * PCTODSP_OFFSET(DAQDS__size);
 		writew(DAPQ_tail, chip->DAPQ + JQS_wTail);
 		/* Tell the DSP to play the bank */
 		snd_msnd_send_dsp_cmd(chip, HDEX_PLAY_START);
 		if (protect)
 			if (2 == bank_num)
 				break;
 	}
 	/*
 	if (protect)
 		snd_printd(KERN_INFO "%lX\n", xtime.tv_usec);
 	*/
 	/* spin_unlock_irqrestore(&chip->lock, flags); not necessary */
 	return nbanks;
 }
 EXPORT_SYMBOL(snd_msnd_DAPQ);

 static void snd_msnd_play_reset_queue(struct snd_msnd *chip,
 				      unsigned int pcm_periods,
 				      unsigned int pcm_count)
 {
 	int	n;
 	void	*pDAQ = chip->mappedbase + DAPQ_DATA_BUFF;

 	chip->last_playbank = -1;
 	chip->playLimit = pcm_count * (pcm_periods - 1);
 	chip->playPeriods = pcm_periods;
 	writew(PCTODSP_OFFSET(0 * DAQDS__size), chip->DAPQ + JQS_wHead);
 	writew(PCTODSP_OFFSET(0 * DAQDS__size), chip->DAPQ + JQS_wTail);

 	chip->play_period_bytes = pcm_count;

 	for (n = 0; n < pcm_periods; ++n, pDAQ += DAQDS__size) {
 		writew(PCTODSP_BASED((u32)(pcm_count * n)),
 			pDAQ + DAQDS_wStart);
 		writew(0, pDAQ + DAQDS_wSize);
 		writew(1, pDAQ + DAQDS_wFormat);
 		writew(chip->play_sample_size, pDAQ + DAQDS_wSampleSize);
 		writew(chip->play_channels, pDAQ + DAQDS_wChannels);
 		writew(chip->play_sample_rate, pDAQ + DAQDS_wSampleRate);
 		writew(HIMT_PLAY_DONE * 0x100 + n, pDAQ + DAQDS_wIntMsg);
 		writew(n, pDAQ + DAQDS_wFlags);
 	}
 }

 static void snd_msnd_capture_reset_queue(struct snd_msnd *chip,
 					 unsigned int pcm_periods,
 					 unsigned int pcm_count)
 {
 	int		n;
 	void		*pDAQ;
 	/* unsigned long	flags; */

 	/* snd_msnd_init_queue(chip->DARQ, DARQ_DATA_BUFF, DARQ_BUFF_SIZE); */

 	chip->last_recbank = 2;
 	chip->captureLimit = pcm_count * (pcm_periods - 1);
 	chip->capturePeriods = pcm_periods;
 	writew(PCTODSP_OFFSET(0 * DAQDS__size), chip->DARQ + JQS_wHead);
 	writew(PCTODSP_OFFSET(chip->last_recbank * DAQDS__size),
 		chip->DARQ + JQS_wTail);

 #if 0 /* Critical section: bank 1 access. this is how the OSS driver does it:*/
 	spin_lock_irqsave(&chip->lock, flags);
 	outb(HPBLKSEL_1, chip->io + HP_BLKS);
 	memset_io(chip->mappedbase, 0, DAR_BUFF_SIZE * 3);
 	outb(HPBLKSEL_0, chip->io + HP_BLKS);
 	spin_unlock_irqrestore(&chip->lock, flags);
 #endif

 	chip->capturePeriodBytes = pcm_count;
 	snd_printdd("snd_msnd_capture_reset_queue() %i\n", pcm_count);

 	pDAQ = chip->mappedbase + DARQ_DATA_BUFF;

 	for (n = 0; n < pcm_periods; ++n, pDAQ += DAQDS__size) {
 		u32 tmp = pcm_count * n;

 		writew(PCTODSP_BASED(tmp + 0x3000), pDAQ + DAQDS_wStart);
 		writew(pcm_count, pDAQ + DAQDS_wSize);
 		writew(1, pDAQ + DAQDS_wFormat);
 		writew(chip->capture_sample_size, pDAQ + DAQDS_wSampleSize);
 		writew(chip->capture_channels, pDAQ + DAQDS_wChannels);
 		writew(chip->capture_sample_rate, pDAQ + DAQDS_wSampleRate);
 		writew(HIMT_RECORD_DONE * 0x100 + n, pDAQ + DAQDS_wIntMsg);
 		writew(n, pDAQ + DAQDS_wFlags);
 	}
 }

 static struct snd_pcm_hardware snd_msnd_playback = {
 	.info =			SNDRV_PCM_INFO_MMAP |
 				SNDRV_PCM_INFO_INTERLEAVED |
 				SNDRV_PCM_INFO_MMAP_VALID |
 				SNDRV_PCM_INFO_BATCH,
 	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 	.rates =		SNDRV_PCM_RATE_8000_48000,
 	.rate_min =		8000,
 	.rate_max =		48000,
 	.channels_min =		1,
 	.channels_max =		2,
 	.buffer_bytes_max =	0x3000,
 	.period_bytes_min =	0x40,
 	.period_bytes_max =	0x1800,
 	.periods_min =		2,
 	.periods_max =		3,
 	.fifo_size =		0,
 };

 static struct snd_pcm_hardware snd_msnd_capture = {
 	.info =			SNDRV_PCM_INFO_MMAP |
 				SNDRV_PCM_INFO_INTERLEAVED |
 				SNDRV_PCM_INFO_MMAP_VALID |
 				SNDRV_PCM_INFO_BATCH,
 	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 	.rates =		SNDRV_PCM_RATE_8000_48000,
 	.rate_min =		8000,
 	.rate_max =		48000,
 	.channels_min =		1,
 	.channels_max =		2,
 	.buffer_bytes_max =	0x3000,
 	.period_bytes_min =	0x40,
 	.period_bytes_max =	0x1800,
 	.periods_min =		2,
 	.periods_max =		3,
 	.fifo_size =		0,
 };


 static int snd_msnd_playback_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

 	set_bit(F_AUDIO_WRITE_INUSE, &chip->flags);
 	clear_bit(F_WRITING, &chip->flags);
 	snd_msnd_enable_irq(chip);

 	runtime->dma_area = chip->mappedbase;
 	runtime->dma_bytes = 0x3000;

 	chip->playback_substream = substream;
 	runtime->hw = snd_msnd_playback;
 	return 0;
 }

 static int snd_msnd_playback_close(struct snd_pcm_substream *substream)
 {
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

 	snd_msnd_disable_irq(chip);
 	clear_bit(F_AUDIO_WRITE_INUSE, &chip->flags);
 	return 0;
 }


 static int snd_msnd_playback_hw_params(struct snd_pcm_substream *substream,
 					struct snd_pcm_hw_params *params)
 {
 	int	i;
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
 	void	*pDAQ =	chip->mappedbase + DAPQ_DATA_BUFF;

 	chip->play_sample_size = snd_pcm_format_width(params_format(params));
 	chip->play_channels = params_channels(params);
 	chip->play_sample_rate = params_rate(params);

 	for (i = 0; i < 3; ++i, pDAQ += DAQDS__size) {
 		writew(chip->play_sample_size, pDAQ + DAQDS_wSampleSize);
 		writew(chip->play_channels, pDAQ + DAQDS_wChannels);
 		writew(chip->play_sample_rate, pDAQ + DAQDS_wSampleRate);
 	}
 	/* dont do this here:
 	 * snd_msnd_calibrate_adc(chip->play_sample_rate);
 	 */

 	return 0;
 }

 static int snd_msnd_playback_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
 	unsigned int pcm_size = snd_pcm_lib_buffer_bytes(substream);
 	unsigned int pcm_count = snd_pcm_lib_period_bytes(substream);
 	unsigned int pcm_periods = pcm_size / pcm_count;

 	snd_msnd_play_reset_queue(chip, pcm_periods, pcm_count);
 	chip->playDMAPos = 0;
 	return 0;
 }

 static int snd_msnd_playback_trigger(struct snd_pcm_substream *substream,
 				     int cmd)
 {
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
 	int	result = 0;

 	if (cmd == SNDRV_PCM_TRIGGER_START) {
 		snd_printdd("snd_msnd_playback_trigger(START)\n");
 		chip->banksPlayed = 0;
 		set_bit(F_WRITING, &chip->flags);
 		snd_msnd_DAPQ(chip, 1);
 	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 		snd_printdd("snd_msnd_playback_trigger(STop)\n");
 		/* interrupt diagnostic, comment this out later */
 		clear_bit(F_WRITING, &chip->flags);
 		snd_msnd_send_dsp_cmd(chip, HDEX_PLAY_STOP);
 	} else {
 		snd_printd(KERN_ERR "snd_msnd_playback_trigger(?????)\n");
 		result = -EINVAL;
 	}

 	snd_printdd("snd_msnd_playback_trigger() ENDE\n");
 	return result;
 }

 static snd_pcm_uframes_t
 snd_msnd_playback_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

 	return bytes_to_frames(substream->runtime, chip->playDMAPos);
 }


 static struct snd_pcm_ops snd_msnd_playback_ops = {
 	.open =		snd_msnd_playback_open,
 	.close =	snd_msnd_playback_close,
 	.ioctl =	snd_pcm_lib_ioctl,
 	.hw_params =	snd_msnd_playback_hw_params,
 	.prepare =	snd_msnd_playback_prepare,
 	.trigger =	snd_msnd_playback_trigger,
 	.pointer =	snd_msnd_playback_pointer,
 };

 static int snd_msnd_capture_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

 	set_bit(F_AUDIO_READ_INUSE, &chip->flags);
 	snd_msnd_enable_irq(chip);
 	runtime->dma_area = chip->mappedbase + 0x3000;
 	runtime->dma_bytes = 0x3000;
 	memset(runtime->dma_area, 0, runtime->dma_bytes);
 	chip->capture_substream = substream;
 	runtime->hw = snd_msnd_capture;
 	return 0;
 }

 static int snd_msnd_capture_close(struct snd_pcm_substream *substream)
 {
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

 	snd_msnd_disable_irq(chip);
 	clear_bit(F_AUDIO_READ_INUSE, &chip->flags);
 	return 0;
 }

 static int snd_msnd_capture_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
 	unsigned int pcm_size = snd_pcm_lib_buffer_bytes(substream);
 	unsigned int pcm_count = snd_pcm_lib_period_bytes(substream);
 	unsigned int pcm_periods = pcm_size / pcm_count;

 	snd_msnd_capture_reset_queue(chip, pcm_periods, pcm_count);
 	chip->captureDMAPos = 0;
 	return 0;
 }

 static int snd_msnd_capture_trigger(struct snd_pcm_substream *substream,
 				    int cmd)
 {
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

 	if (cmd == SNDRV_PCM_TRIGGER_START) {
 		chip->last_recbank = -1;
 		set_bit(F_READING, &chip->flags);
 		if (snd_msnd_send_dsp_cmd(chip, HDEX_RECORD_START) == 0)
 			return 0;

 		clear_bit(F_READING, &chip->flags);
 	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 		clear_bit(F_READING, &chip->flags);
 		snd_msnd_send_dsp_cmd(chip, HDEX_RECORD_STOP);
 		return 0;
 	}
 	return -EINVAL;
 }


 static snd_pcm_uframes_t
 snd_msnd_capture_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

 	return bytes_to_frames(runtime, chip->captureDMAPos);
 }


 static int snd_msnd_capture_hw_params(struct snd_pcm_substream *substream,
 					struct snd_pcm_hw_params *params)
 {
 	int		i;
 	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
 	void		*pDAQ = chip->mappedbase + DARQ_DATA_BUFF;

 	chip->capture_sample_size = snd_pcm_format_width(params_format(params));
 	chip->capture_channels = params_channels(params);
 	chip->capture_sample_rate = params_rate(params);

 	for (i = 0; i < 3; ++i, pDAQ += DAQDS__size) {
 		writew(chip->capture_sample_size, pDAQ + DAQDS_wSampleSize);
 		writew(chip->capture_channels, pDAQ + DAQDS_wChannels);
 		writew(chip->capture_sample_rate, pDAQ + DAQDS_wSampleRate);
 	}
 	return 0;
 }


 static struct snd_pcm_ops snd_msnd_capture_ops = {
 	.open =		snd_msnd_capture_open,
 	.close =	snd_msnd_capture_close,
 	.ioctl =	snd_pcm_lib_ioctl,
 	.hw_params =	snd_msnd_capture_hw_params,
 	.prepare =	snd_msnd_capture_prepare,
 	.trigger =	snd_msnd_capture_trigger,
 	.pointer =	snd_msnd_capture_pointer,
 };


 int snd_msnd_pcm(struct snd_card *card, int device)
 {
 	struct snd_msnd *chip = card->private_data;
 	struct snd_pcm	*pcm;
 	int err;

 	err = snd_pcm_new(card, "MSNDPINNACLE", device, 1, 1, &pcm);
 	if (err < 0)
 		return err;

 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_msnd_playback_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_msnd_capture_ops);

 	pcm->private_data = chip;
 	strcpy(pcm->name, "Hurricane");

 	return 0;
 }
 EXPORT_SYMBOL(snd_msnd_pcm);

 MODULE_DESCRIPTION("Common routines for Turtle Beach Multisound drivers");
 MODULE_LICENSE("GPL");
	/*********************************************************************
	*
	* 2002/06/30 Karsten Wiese:
	* removed kernel-version dependencies.
	* ripped from linux kernel 2.4.18 (OSS Implementation) by me.
	* In the OSS Version, this file is compiled to a separate MODULE,
	* that is used by the pinnacle and the classic driver.
	* since there is no classic driver for alsa yet (i dont have a classic
	* & writing one blindfold is difficult) this file's object is statically
	* linked into the pinnacle-driver-module for now. look for the string
	* "uncomment this to make this a module again"
	* to do guess what.
	*
	* the following is a copy of the 2.4.18 OSS FREE file-heading comment:
	*
	* 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/kernel.h>
	#include <linux/types.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/fs.h>
	#include <linux/delay.h>
	#include <linux/module.h>

	#include <sound/core.h>
	#include <sound/initval.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>

	#include "msnd.h"

	#define LOGNAME "msnd"


	void snd_msnd_init_queue(void *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);
	}
	EXPORT_SYMBOL(snd_msnd_init_queue);

	static int snd_msnd_wait_TXDE(struct snd_msnd *dev)
	{
	unsigned int io = dev->io;
	int timeout = 1000;

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

	return -EIO;
	}

	static int snd_msnd_wait_HC0(struct snd_msnd *dev)
	{
	unsigned int io = dev->io;
	int timeout = 1000;

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

	return -EIO;
	}

	int snd_msnd_send_dsp_cmd(struct snd_msnd *dev, u8 cmd)
	{
	unsigned long flags;

	spin_lock_irqsave(&dev->lock, flags);
	if (snd_msnd_wait_HC0(dev) == 0) {
	outb(cmd, dev->io + HP_CVR);
	spin_unlock_irqrestore(&dev->lock, flags);
	return 0;
	}
	spin_unlock_irqrestore(&dev->lock, flags);

	snd_printd(KERN_ERR LOGNAME ": Send DSP command timeout\n");

	return -EIO;
	}
	EXPORT_SYMBOL(snd_msnd_send_dsp_cmd);

	int snd_msnd_send_word(struct snd_msnd *dev, unsigned char high,
	unsigned char mid, unsigned char low)
	{
	unsigned int io = dev->io;

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

	snd_printd(KERN_ERR LOGNAME ": Send host word timeout\n");

	return -EIO;
	}
	EXPORT_SYMBOL(snd_msnd_send_word);

	int snd_msnd_upload_host(struct snd_msnd dev, const u8 bin, int len)
	{
	int i;

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

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

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

	return 0;
	}
	EXPORT_SYMBOL(snd_msnd_upload_host);

	int snd_msnd_enable_irq(struct snd_msnd *dev)
	{
	unsigned long flags;

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

	snd_printdd(LOGNAME ": Enabling IRQ\n");

	spin_lock_irqsave(&dev->lock, flags);
	if (snd_msnd_wait_TXDE(dev) == 0) {
	outb(inb(dev->io + HP_ICR) \| HPICR_TREQ, dev->io + HP_ICR);
	if (dev->type == msndClassic)
	outb(dev->irqid, dev->io + HP_IRQM);

	outb(inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
	outb(inb(dev->io + HP_ICR) \| HPICR_RREQ, dev->io + HP_ICR);
	enable_irq(dev->irq);
	snd_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);

	snd_printd(KERN_ERR LOGNAME ": Enable IRQ failed\n");

	return -EIO;
	}
	EXPORT_SYMBOL(snd_msnd_enable_irq);

	int snd_msnd_disable_irq(struct snd_msnd *dev)
	{
	unsigned long flags;

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

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

	snd_printdd(LOGNAME ": Disabling IRQ\n");

	spin_lock_irqsave(&dev->lock, flags);
	if (snd_msnd_wait_TXDE(dev) == 0) {
	outb(inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
	if (dev->type == msndClassic)
	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);

	snd_printd(KERN_ERR LOGNAME ": Disable IRQ failed\n");

	return -EIO;
	}
	EXPORT_SYMBOL(snd_msnd_disable_irq);

	static inline long get_play_delay_jiffies(struct snd_msnd *chip, long size)
	{
	long tmp = (size * HZ * chip->play_sample_size) / 8;
	return tmp / (chip->play_sample_rate * chip->play_channels);
	}

	static void snd_msnd_dsp_write_flush(struct snd_msnd *chip)
	{
	if (!(chip->mode & FMODE_WRITE) \|\| !test_bit(F_WRITING, &chip->flags))
	return;
	set_bit(F_WRITEFLUSH, &chip->flags);
	/* interruptible_sleep_on_timeout(
	&chip->writeflush,
	get_play_delay_jiffies(&chip, chip->DAPF.len));*/
	clear_bit(F_WRITEFLUSH, &chip->flags);
	if (!signal_pending(current))
	schedule_timeout_interruptible(
	get_play_delay_jiffies(chip, chip->play_period_bytes));
	clear_bit(F_WRITING, &chip->flags);
	}

	void snd_msnd_dsp_halt(struct snd_msnd chip, struct file file)
	{
	if ((file ? file->f_mode : chip->mode) & FMODE_READ) {
	clear_bit(F_READING, &chip->flags);
	snd_msnd_send_dsp_cmd(chip, HDEX_RECORD_STOP);
	snd_msnd_disable_irq(chip);
	if (file) {
	snd_printd(KERN_INFO LOGNAME
	": Stopping read for %p\n", file);
	chip->mode &= ~FMODE_READ;
	}
	clear_bit(F_AUDIO_READ_INUSE, &chip->flags);
	}
	if ((file ? file->f_mode : chip->mode) & FMODE_WRITE) {
	if (test_bit(F_WRITING, &chip->flags)) {
	snd_msnd_dsp_write_flush(chip);
	snd_msnd_send_dsp_cmd(chip, HDEX_PLAY_STOP);
	}
	snd_msnd_disable_irq(chip);
	if (file) {
	snd_printd(KERN_INFO
	LOGNAME ": Stopping write for %p\n", file);
	chip->mode &= ~FMODE_WRITE;
	}
	clear_bit(F_AUDIO_WRITE_INUSE, &chip->flags);
	}
	}
	EXPORT_SYMBOL(snd_msnd_dsp_halt);


	int snd_msnd_DARQ(struct snd_msnd *chip, int bank)
	{
	int /size, n,/ timeout = 3;
	u16 wTmp;
	/* void DAQD; /

	/* Increment the tail and check for queue wrap */
	wTmp = readw(chip->DARQ + JQS_wTail) + PCTODSP_OFFSET(DAQDS__size);
	if (wTmp > readw(chip->DARQ + JQS_wSize))
	wTmp = 0;
	while (wTmp == readw(chip->DARQ + JQS_wHead) && timeout--)
	udelay(1);

	if (chip->capturePeriods == 2) {
	void *pDAQ = chip->mappedbase + DARQ_DATA_BUFF +
	bank * DAQDS__size + DAQDS_wStart;
	unsigned short offset = 0x3000 + chip->capturePeriodBytes;

	if (readw(pDAQ) != PCTODSP_BASED(0x3000))
	offset = 0x3000;
	writew(PCTODSP_BASED(offset), pDAQ);
	}

	writew(wTmp, chip->DARQ + JQS_wTail);

	#if 0
	/* Get our digital audio queue struct */
	DAQD = bank * DAQDS__size + chip->mappedbase + DARQ_DATA_BUFF;

	/* Get length of data */
	size = readw(DAQD + DAQDS_wSize);

	/* Read data from the head (unprotected bank 1 access okay
	since this is only called inside an interrupt) */
	outb(HPBLKSEL_1, chip->io + HP_BLKS);
	n = msnd_fifo_write(&chip->DARF,
	(char )(chip->base + bank DAR_BUFF_SIZE),
	size, 0);
	if (n <= 0) {
	outb(HPBLKSEL_0, chip->io + HP_BLKS);
	return n;
	}
	outb(HPBLKSEL_0, chip->io + HP_BLKS);
	#endif

	return 1;
	}
	EXPORT_SYMBOL(snd_msnd_DARQ);

	int snd_msnd_DAPQ(struct snd_msnd *chip, int start)
	{
	u16 DAPQ_tail;
	int protect = start, nbanks = 0;
	void *DAQD;
	static int play_banks_submitted;
	/* unsigned long flags;
	spin_lock_irqsave(&chip->lock, flags); not necessary */

	DAPQ_tail = readw(chip->DAPQ + JQS_wTail);
	while (DAPQ_tail != readw(chip->DAPQ + JQS_wHead) \|\| start) {
	int bank_num = DAPQ_tail / PCTODSP_OFFSET(DAQDS__size);

	if (start) {
	start = 0;
	play_banks_submitted = 0;
	}

	/* Get our digital audio queue struct */
	DAQD = bank_num * DAQDS__size + chip->mappedbase +
	DAPQ_DATA_BUFF;

	/* Write size of this bank */
	writew(chip->play_period_bytes, DAQD + DAQDS_wSize);
	if (play_banks_submitted < 3)
	++play_banks_submitted;
	else if (chip->playPeriods == 2) {
	unsigned short offset = chip->play_period_bytes;

	if (readw(DAQD + DAQDS_wStart) != PCTODSP_BASED(0x0))
	offset = 0;

	writew(PCTODSP_BASED(offset), DAQD + DAQDS_wStart);
	}
	++nbanks;

	/* Then advance the tail */
	/*
	if (protect)
	snd_printd(KERN_INFO "B %X %lX\n",
	bank_num, xtime.tv_usec);
	*/

	DAPQ_tail = (++bank_num % 3) * PCTODSP_OFFSET(DAQDS__size);
	writew(DAPQ_tail, chip->DAPQ + JQS_wTail);
	/* Tell the DSP to play the bank */
	snd_msnd_send_dsp_cmd(chip, HDEX_PLAY_START);
	if (protect)
	if (2 == bank_num)
	break;
	}
	/*
	if (protect)
	snd_printd(KERN_INFO "%lX\n", xtime.tv_usec);
	*/
	/* spin_unlock_irqrestore(&chip->lock, flags); not necessary */
	return nbanks;
	}
	EXPORT_SYMBOL(snd_msnd_DAPQ);

	static void snd_msnd_play_reset_queue(struct snd_msnd *chip,
	unsigned int pcm_periods,
	unsigned int pcm_count)
	{
	int n;
	void *pDAQ = chip->mappedbase + DAPQ_DATA_BUFF;

	chip->last_playbank = -1;
	chip->playLimit = pcm_count * (pcm_periods - 1);
	chip->playPeriods = pcm_periods;
	writew(PCTODSP_OFFSET(0 * DAQDS__size), chip->DAPQ + JQS_wHead);
	writew(PCTODSP_OFFSET(0 * DAQDS__size), chip->DAPQ + JQS_wTail);

	chip->play_period_bytes = pcm_count;

	for (n = 0; n < pcm_periods; ++n, pDAQ += DAQDS__size) {
	writew(PCTODSP_BASED((u32)(pcm_count * n)),
	pDAQ + DAQDS_wStart);
	writew(0, pDAQ + DAQDS_wSize);
	writew(1, pDAQ + DAQDS_wFormat);
	writew(chip->play_sample_size, pDAQ + DAQDS_wSampleSize);
	writew(chip->play_channels, pDAQ + DAQDS_wChannels);
	writew(chip->play_sample_rate, pDAQ + DAQDS_wSampleRate);
	writew(HIMT_PLAY_DONE * 0x100 + n, pDAQ + DAQDS_wIntMsg);
	writew(n, pDAQ + DAQDS_wFlags);
	}
	}

	static void snd_msnd_capture_reset_queue(struct snd_msnd *chip,
	unsigned int pcm_periods,
	unsigned int pcm_count)
	{
	int n;
	void *pDAQ;
	/* unsigned long flags; */

	/* snd_msnd_init_queue(chip->DARQ, DARQ_DATA_BUFF, DARQ_BUFF_SIZE); */

	chip->last_recbank = 2;
	chip->captureLimit = pcm_count * (pcm_periods - 1);
	chip->capturePeriods = pcm_periods;
	writew(PCTODSP_OFFSET(0 * DAQDS__size), chip->DARQ + JQS_wHead);
	writew(PCTODSP_OFFSET(chip->last_recbank * DAQDS__size),
	chip->DARQ + JQS_wTail);

	#if 0 /* Critical section: bank 1 access. this is how the OSS driver does it:*/
	spin_lock_irqsave(&chip->lock, flags);
	outb(HPBLKSEL_1, chip->io + HP_BLKS);
	memset_io(chip->mappedbase, 0, DAR_BUFF_SIZE * 3);
	outb(HPBLKSEL_0, chip->io + HP_BLKS);
	spin_unlock_irqrestore(&chip->lock, flags);
	#endif

	chip->capturePeriodBytes = pcm_count;
	snd_printdd("snd_msnd_capture_reset_queue() %i\n", pcm_count);

	pDAQ = chip->mappedbase + DARQ_DATA_BUFF;

	for (n = 0; n < pcm_periods; ++n, pDAQ += DAQDS__size) {
	u32 tmp = pcm_count * n;

	writew(PCTODSP_BASED(tmp + 0x3000), pDAQ + DAQDS_wStart);
	writew(pcm_count, pDAQ + DAQDS_wSize);
	writew(1, pDAQ + DAQDS_wFormat);
	writew(chip->capture_sample_size, pDAQ + DAQDS_wSampleSize);
	writew(chip->capture_channels, pDAQ + DAQDS_wChannels);
	writew(chip->capture_sample_rate, pDAQ + DAQDS_wSampleRate);
	writew(HIMT_RECORD_DONE * 0x100 + n, pDAQ + DAQDS_wIntMsg);
	writew(n, pDAQ + DAQDS_wFlags);
	}
	}

	static struct snd_pcm_hardware snd_msnd_playback = {
	.info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_BATCH,
	.formats = SNDRV_PCM_FMTBIT_U8 \| SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.rate_min = 8000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 2,
	.buffer_bytes_max = 0x3000,
	.period_bytes_min = 0x40,
	.period_bytes_max = 0x1800,
	.periods_min = 2,
	.periods_max = 3,
	.fifo_size = 0,
	};

	static struct snd_pcm_hardware snd_msnd_capture = {
	.info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_BATCH,
	.formats = SNDRV_PCM_FMTBIT_U8 \| SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.rate_min = 8000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 2,
	.buffer_bytes_max = 0x3000,
	.period_bytes_min = 0x40,
	.period_bytes_max = 0x1800,
	.periods_min = 2,
	.periods_max = 3,
	.fifo_size = 0,
	};


	static int snd_msnd_playback_open(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

	set_bit(F_AUDIO_WRITE_INUSE, &chip->flags);
	clear_bit(F_WRITING, &chip->flags);
	snd_msnd_enable_irq(chip);

	runtime->dma_area = chip->mappedbase;
	runtime->dma_bytes = 0x3000;

	chip->playback_substream = substream;
	runtime->hw = snd_msnd_playback;
	return 0;
	}

	static int snd_msnd_playback_close(struct snd_pcm_substream *substream)
	{
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

	snd_msnd_disable_irq(chip);
	clear_bit(F_AUDIO_WRITE_INUSE, &chip->flags);
	return 0;
	}


	static int snd_msnd_playback_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	int i;
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
	void *pDAQ = chip->mappedbase + DAPQ_DATA_BUFF;

	chip->play_sample_size = snd_pcm_format_width(params_format(params));
	chip->play_channels = params_channels(params);
	chip->play_sample_rate = params_rate(params);

	for (i = 0; i < 3; ++i, pDAQ += DAQDS__size) {
	writew(chip->play_sample_size, pDAQ + DAQDS_wSampleSize);
	writew(chip->play_channels, pDAQ + DAQDS_wChannels);
	writew(chip->play_sample_rate, pDAQ + DAQDS_wSampleRate);
	}
	/* dont do this here:
	* snd_msnd_calibrate_adc(chip->play_sample_rate);
	*/

	return 0;
	}

	static int snd_msnd_playback_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
	unsigned int pcm_size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int pcm_count = snd_pcm_lib_period_bytes(substream);
	unsigned int pcm_periods = pcm_size / pcm_count;

	snd_msnd_play_reset_queue(chip, pcm_periods, pcm_count);
	chip->playDMAPos = 0;
	return 0;
	}

	static int snd_msnd_playback_trigger(struct snd_pcm_substream *substream,
	int cmd)
	{
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
	int result = 0;

	if (cmd == SNDRV_PCM_TRIGGER_START) {
	snd_printdd("snd_msnd_playback_trigger(START)\n");
	chip->banksPlayed = 0;
	set_bit(F_WRITING, &chip->flags);
	snd_msnd_DAPQ(chip, 1);
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
	snd_printdd("snd_msnd_playback_trigger(STop)\n");
	/* interrupt diagnostic, comment this out later */
	clear_bit(F_WRITING, &chip->flags);
	snd_msnd_send_dsp_cmd(chip, HDEX_PLAY_STOP);
	} else {
	snd_printd(KERN_ERR "snd_msnd_playback_trigger(?????)\n");
	result = -EINVAL;
	}

	snd_printdd("snd_msnd_playback_trigger() ENDE\n");
	return result;
	}

	static snd_pcm_uframes_t
	snd_msnd_playback_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

	return bytes_to_frames(substream->runtime, chip->playDMAPos);
	}


	static struct snd_pcm_ops snd_msnd_playback_ops = {
	.open = snd_msnd_playback_open,
	.close = snd_msnd_playback_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_msnd_playback_hw_params,
	.prepare = snd_msnd_playback_prepare,
	.trigger = snd_msnd_playback_trigger,
	.pointer = snd_msnd_playback_pointer,
	};

	static int snd_msnd_capture_open(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

	set_bit(F_AUDIO_READ_INUSE, &chip->flags);
	snd_msnd_enable_irq(chip);
	runtime->dma_area = chip->mappedbase + 0x3000;
	runtime->dma_bytes = 0x3000;
	memset(runtime->dma_area, 0, runtime->dma_bytes);
	chip->capture_substream = substream;
	runtime->hw = snd_msnd_capture;
	return 0;
	}

	static int snd_msnd_capture_close(struct snd_pcm_substream *substream)
	{
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

	snd_msnd_disable_irq(chip);
	clear_bit(F_AUDIO_READ_INUSE, &chip->flags);
	return 0;
	}

	static int snd_msnd_capture_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
	unsigned int pcm_size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int pcm_count = snd_pcm_lib_period_bytes(substream);
	unsigned int pcm_periods = pcm_size / pcm_count;

	snd_msnd_capture_reset_queue(chip, pcm_periods, pcm_count);
	chip->captureDMAPos = 0;
	return 0;
	}

	static int snd_msnd_capture_trigger(struct snd_pcm_substream *substream,
	int cmd)
	{
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

	if (cmd == SNDRV_PCM_TRIGGER_START) {
	chip->last_recbank = -1;
	set_bit(F_READING, &chip->flags);
	if (snd_msnd_send_dsp_cmd(chip, HDEX_RECORD_START) == 0)
	return 0;

	clear_bit(F_READING, &chip->flags);
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
	clear_bit(F_READING, &chip->flags);
	snd_msnd_send_dsp_cmd(chip, HDEX_RECORD_STOP);
	return 0;
	}
	return -EINVAL;
	}


	static snd_pcm_uframes_t
	snd_msnd_capture_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);

	return bytes_to_frames(runtime, chip->captureDMAPos);
	}


	static int snd_msnd_capture_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	int i;
	struct snd_msnd *chip = snd_pcm_substream_chip(substream);
	void *pDAQ = chip->mappedbase + DARQ_DATA_BUFF;

	chip->capture_sample_size = snd_pcm_format_width(params_format(params));
	chip->capture_channels = params_channels(params);
	chip->capture_sample_rate = params_rate(params);

	for (i = 0; i < 3; ++i, pDAQ += DAQDS__size) {
	writew(chip->capture_sample_size, pDAQ + DAQDS_wSampleSize);
	writew(chip->capture_channels, pDAQ + DAQDS_wChannels);
	writew(chip->capture_sample_rate, pDAQ + DAQDS_wSampleRate);
	}
	return 0;
	}


	static struct snd_pcm_ops snd_msnd_capture_ops = {
	.open = snd_msnd_capture_open,
	.close = snd_msnd_capture_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_msnd_capture_hw_params,
	.prepare = snd_msnd_capture_prepare,
	.trigger = snd_msnd_capture_trigger,
	.pointer = snd_msnd_capture_pointer,
	};


	int snd_msnd_pcm(struct snd_card *card, int device)
	{
	struct snd_msnd *chip = card->private_data;
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(card, "MSNDPINNACLE", device, 1, 1, &pcm);
	if (err < 0)
	return err;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_msnd_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_msnd_capture_ops);

	pcm->private_data = chip;
	strcpy(pcm->name, "Hurricane");

	return 0;
	}
	EXPORT_SYMBOL(snd_msnd_pcm);

	MODULE_DESCRIPTION("Common routines for Turtle Beach Multisound drivers");
	MODULE_LICENSE("GPL");