msnd.c

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/*********************************************************************
 *
 * 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_pcm **rpcm)
{
    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");


    if (rpcm)
        *rpcm = pcm;
    return 0;
}
EXPORT_SYMBOL(snd_msnd_pcm);

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