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OpenCloudOS-Kernel/sound/isa/msnd/msnd.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*********************************************************************
*
* 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
*
********************************************************************/
#include <linux/kernel.h>
#include <linux/sched/signal.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 __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);
}
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 __iomem *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 __iomem *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 __iomem *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 __iomem *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 const 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 const 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 = (__force void *)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 __iomem *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 const struct snd_pcm_ops snd_msnd_playback_ops = {
.open = snd_msnd_playback_open,
.close = snd_msnd_playback_close,
.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 = (__force void *)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 __iomem *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 const struct snd_pcm_ops snd_msnd_capture_ops = {
.open = snd_msnd_capture_open,
.close = snd_msnd_capture_close,
.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");
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