/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *                   Abramo Bagnara <abramo@alsa-project.org>
 *                   Cirrus Logic, Inc.
 *  Routines for control of Cirrus Logic CS461x chips
 *
 *  KNOWN BUGS:
 *    - Sometimes the SPDIF input DSP tasks get's unsynchronized
 *      and the SPDIF get somewhat "distorcionated", or/and left right channel
 *      are swapped. To get around this problem when it happens, mute and unmute 
 *      the SPDIF input mixer control.
 *    - On the Hercules Game Theater XP the amplifier are sometimes turned
 *      off on inadecuate moments which causes distorcions on sound.
 *
 *  TODO:
 *    - Secondary CODEC on some soundcards
 *    - SPDIF input support for other sample rates then 48khz
 *    - Posibility to mix the SPDIF output with analog sources.
 *    - PCM channels for Center and LFE on secondary codec
 *
 *  NOTE: with CONFIG_SND_CS46XX_NEW_DSP unset uses old DSP image (which
 *        is default configuration), no SPDIF, no secondary codec, no
 *        multi channel PCM.  But known to work.
 *
 *  FINALLY: A credit to the developers Tom and Jordan 
 *           at Cirrus for have helping me out with the DSP, however we
 *           still don't have sufficient documentation and technical
 *           references to be able to implement all fancy feutures
 *           supported by the cs46xx DSP's. 
 *           Benny <benny@hostmobility.com>
 *                
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/mutex.h>


#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/cs46xx.h>

#include <asm/io.h>

#include "cs46xx_lib.h"
#include "dsp_spos.h"

static void amp_voyetra(struct snd_cs46xx *chip, int change);

#ifdef CONFIG_SND_CS46XX_NEW_DSP
static struct snd_pcm_ops snd_cs46xx_playback_rear_ops;
static struct snd_pcm_ops snd_cs46xx_playback_indirect_rear_ops;
static struct snd_pcm_ops snd_cs46xx_playback_clfe_ops;
static struct snd_pcm_ops snd_cs46xx_playback_indirect_clfe_ops;
static struct snd_pcm_ops snd_cs46xx_playback_iec958_ops;
static struct snd_pcm_ops snd_cs46xx_playback_indirect_iec958_ops;
#endif

static struct snd_pcm_ops snd_cs46xx_playback_ops;
static struct snd_pcm_ops snd_cs46xx_playback_indirect_ops;
static struct snd_pcm_ops snd_cs46xx_capture_ops;
static struct snd_pcm_ops snd_cs46xx_capture_indirect_ops;

static unsigned short snd_cs46xx_codec_read(struct snd_cs46xx *chip,
                                            unsigned short reg,
                                            int codec_index)
{
        int count;
        unsigned short result,tmp;
        u32 offset = 0;

        if (snd_BUG_ON(codec_index != CS46XX_PRIMARY_CODEC_INDEX &&
                       codec_index != CS46XX_SECONDARY_CODEC_INDEX))
                return -EINVAL;

        chip->active_ctrl(chip, 1);

        if (codec_index == CS46XX_SECONDARY_CODEC_INDEX)
                offset = CS46XX_SECONDARY_CODEC_OFFSET;

        /*
         *  1. Write ACCAD = Command Address Register = 46Ch for AC97 register address
         *  2. Write ACCDA = Command Data Register = 470h    for data to write to AC97 
         *  3. Write ACCTL = Control Register = 460h for initiating the write7---55
         *  4. Read ACCTL = 460h, DCV should be reset by now and 460h = 17h
         *  5. if DCV not cleared, break and return error
         *  6. Read ACSTS = Status Register = 464h, check VSTS bit
         */

        snd_cs46xx_peekBA0(chip, BA0_ACSDA + offset);

        tmp = snd_cs46xx_peekBA0(chip, BA0_ACCTL);
        if ((tmp & ACCTL_VFRM) == 0) {
                snd_printk(KERN_WARNING  "cs46xx: ACCTL_VFRM not set 0x%x\n",tmp);
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL, (tmp & (~ACCTL_ESYN)) | ACCTL_VFRM );
                msleep(50);
                tmp = snd_cs46xx_peekBA0(chip, BA0_ACCTL + offset);
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL, tmp | ACCTL_ESYN | ACCTL_VFRM );

        }

        /*
         *  Setup the AC97 control registers on the CS461x to send the
         *  appropriate command to the AC97 to perform the read.
         *  ACCAD = Command Address Register = 46Ch
         *  ACCDA = Command Data Register = 470h
         *  ACCTL = Control Register = 460h
         *  set DCV - will clear when process completed
         *  set CRW - Read command
         *  set VFRM - valid frame enabled
         *  set ESYN - ASYNC generation enabled
         *  set RSTN - ARST# inactive, AC97 codec not reset
         */

        snd_cs46xx_pokeBA0(chip, BA0_ACCAD, reg);
        snd_cs46xx_pokeBA0(chip, BA0_ACCDA, 0);
        if (codec_index == CS46XX_PRIMARY_CODEC_INDEX) {
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL,/* clear ACCTL_DCV */ ACCTL_CRW | 
                                   ACCTL_VFRM | ACCTL_ESYN |
                                   ACCTL_RSTN);
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL, ACCTL_DCV | ACCTL_CRW |
                                   ACCTL_VFRM | ACCTL_ESYN |
                                   ACCTL_RSTN);
        } else {
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL, ACCTL_DCV | ACCTL_TC |
                                   ACCTL_CRW | ACCTL_VFRM | ACCTL_ESYN |
                                   ACCTL_RSTN);
        }

        /*
         *  Wait for the read to occur.
         */
        for (count = 0; count < 1000; count++) {
                /*
                 *  First, we want to wait for a short time.
                 */
                udelay(10);
                /*
                 *  Now, check to see if the read has completed.
                 *  ACCTL = 460h, DCV should be reset by now and 460h = 17h
                 */
                if (!(snd_cs46xx_peekBA0(chip, BA0_ACCTL) & ACCTL_DCV))
                        goto ok1;
        }

        snd_printk(KERN_ERR "AC'97 read problem (ACCTL_DCV), reg = 0x%x\n", reg);
        result = 0xffff;
        goto end;
        
 ok1:
        /*
         *  Wait for the valid status bit to go active.
         */
        for (count = 0; count < 100; count++) {
                /*
                 *  Read the AC97 status register.
                 *  ACSTS = Status Register = 464h
                 *  VSTS - Valid Status
                 */
                if (snd_cs46xx_peekBA0(chip, BA0_ACSTS + offset) & ACSTS_VSTS)
                        goto ok2;
                udelay(10);
        }
        
        snd_printk(KERN_ERR "AC'97 read problem (ACSTS_VSTS), codec_index %d, reg = 0x%x\n", codec_index, reg);
        result = 0xffff;
        goto end;

 ok2:
        /*
         *  Read the data returned from the AC97 register.
         *  ACSDA = Status Data Register = 474h
         */
#if 0
        printk("e) reg = 0x%x, val = 0x%x, BA0_ACCAD = 0x%x\n", reg,
                        snd_cs46xx_peekBA0(chip, BA0_ACSDA),
                        snd_cs46xx_peekBA0(chip, BA0_ACCAD));
#endif

        //snd_cs46xx_peekBA0(chip, BA0_ACCAD);
        result = snd_cs46xx_peekBA0(chip, BA0_ACSDA + offset);
 end:
        chip->active_ctrl(chip, -1);
        return result;
}

static unsigned short snd_cs46xx_ac97_read(struct snd_ac97 * ac97,
                                            unsigned short reg)
{
        struct snd_cs46xx *chip = ac97->private_data;
        unsigned short val;
        int codec_index = ac97->num;

        if (snd_BUG_ON(codec_index != CS46XX_PRIMARY_CODEC_INDEX &&
                       codec_index != CS46XX_SECONDARY_CODEC_INDEX))
                return 0xffff;

        val = snd_cs46xx_codec_read(chip, reg, codec_index);

        return val;
}


static void snd_cs46xx_codec_write(struct snd_cs46xx *chip,
                                   unsigned short reg,
                                   unsigned short val,
                                   int codec_index)
{
        int count;

        if (snd_BUG_ON(codec_index != CS46XX_PRIMARY_CODEC_INDEX &&
                       codec_index != CS46XX_SECONDARY_CODEC_INDEX))
                return;

        chip->active_ctrl(chip, 1);

        /*
         *  1. Write ACCAD = Command Address Register = 46Ch for AC97 register address
         *  2. Write ACCDA = Command Data Register = 470h    for data to write to AC97
         *  3. Write ACCTL = Control Register = 460h for initiating the write
         *  4. Read ACCTL = 460h, DCV should be reset by now and 460h = 07h
         *  5. if DCV not cleared, break and return error
         */

        /*
         *  Setup the AC97 control registers on the CS461x to send the
         *  appropriate command to the AC97 to perform the read.
         *  ACCAD = Command Address Register = 46Ch
         *  ACCDA = Command Data Register = 470h
         *  ACCTL = Control Register = 460h
         *  set DCV - will clear when process completed
         *  reset CRW - Write command
         *  set VFRM - valid frame enabled
         *  set ESYN - ASYNC generation enabled
         *  set RSTN - ARST# inactive, AC97 codec not reset
         */
        snd_cs46xx_pokeBA0(chip, BA0_ACCAD , reg);
        snd_cs46xx_pokeBA0(chip, BA0_ACCDA , val);
        snd_cs46xx_peekBA0(chip, BA0_ACCTL);

        if (codec_index == CS46XX_PRIMARY_CODEC_INDEX) {
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL, /* clear ACCTL_DCV */ ACCTL_VFRM |
                                   ACCTL_ESYN | ACCTL_RSTN);
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL, ACCTL_DCV | ACCTL_VFRM |
                                   ACCTL_ESYN | ACCTL_RSTN);
        } else {
                snd_cs46xx_pokeBA0(chip, BA0_ACCTL, ACCTL_DCV | ACCTL_TC |
                                   ACCTL_VFRM | ACCTL_ESYN | ACCTL_RSTN);
        }

        for (count = 0; count < 4000; count++) {
                /*
                 *  First, we want to wait for a short time.
                 */
                udelay(10);
                /*
                 *  Now, check to see if the write has completed.
                 *  ACCTL = 460h, DCV should be reset by now and 460h = 07h
                 */
                if (!(snd_cs46xx_peekBA0(chip, BA0_ACCTL) & ACCTL_DCV)) {
                        goto end;
                }
        }
        snd_printk(KERN_ERR "AC'97 write problem, codec_index = %d, reg = 0x%x, val = 0x%x\n", codec_index, reg, val);
 end:
        chip->active_ctrl(chip, -1);
}

static void snd_cs46xx_ac97_write(struct snd_ac97 *ac97,
                                   unsigned short reg,
                                   unsigned short val)
{
        struct snd_cs46xx *chip = ac97->private_data;
        int codec_index = ac97->num;

        if (snd_BUG_ON(codec_index != CS46XX_PRIMARY_CODEC_INDEX &&
                       codec_index != CS46XX_SECONDARY_CODEC_INDEX))
                return;

        snd_cs46xx_codec_write(chip, reg, val, codec_index);
}


/*
 *  Chip initialization
 */

int snd_cs46xx_download(struct snd_cs46xx *chip,
                        u32 *src,
                        unsigned long offset,
                        unsigned long len)
{
        void __iomem *dst;
        unsigned int bank = offset >> 16;
        offset = offset & 0xffff;

        if (snd_BUG_ON((offset & 3) || (len & 3)))
                return -EINVAL;
        dst = chip->region.idx[bank+1].remap_addr + offset;
        len /= sizeof(u32);

        /* writel already converts 32-bit value to right endianess */
        while (len-- > 0) {
                writel(*src++, dst);
                dst += sizeof(u32);
        }
        return 0;
}

#ifdef CONFIG_SND_CS46XX_NEW_DSP

#include "imgs/cwc4630.h"
#include "imgs/cwcasync.h"
#include "imgs/cwcsnoop.h"
#include "imgs/cwcbinhack.h"
#include "imgs/cwcdma.h"

int snd_cs46xx_clear_BA1(struct snd_cs46xx *chip,
                         unsigned long offset,
                         unsigned long len) 
{
        void __iomem *dst;
        unsigned int bank = offset >> 16;
        offset = offset & 0xffff;

        if (snd_BUG_ON((offset & 3) || (len & 3)))
                return -EINVAL;
        dst = chip->region.idx[bank+1].remap_addr + offset;
        len /= sizeof(u32);

        /* writel already converts 32-bit value to right endianess */
        while (len-- > 0) {
                writel(0, dst);
                dst += sizeof(u32);
        }
        return 0;
}

#else /* old DSP image */

#include "cs46xx_image.h"

int snd_cs46xx_download_image(struct snd_cs46xx *chip)
{
        int idx, err;
        unsigned long offset = 0;

        for (idx = 0; idx < BA1_MEMORY_COUNT; idx++) {
                if ((err = snd_cs46xx_download(chip,
                                               &BA1Struct.map[offset],
                                               BA1Struct.memory[idx].offset,
                                               BA1Struct.memory[idx].size)) < 0)
                        return err;
                offset += BA1Struct.memory[idx].size >> 2;
        }       
        return 0;
}
#endif /* CONFIG_SND_CS46XX_NEW_DSP */

/*
 *  Chip reset
 */

static void snd_cs46xx_reset(struct snd_cs46xx *chip)
{
        int idx;

        /*
         *  Write the reset bit of the SP control register.
         */
        snd_cs46xx_poke(chip, BA1_SPCR, SPCR_RSTSP);

        /*
         *  Write the control register.
         */
        snd_cs46xx_poke(chip, BA1_SPCR, SPCR_DRQEN);

        /*
         *  Clear the trap registers.
         */
        for (idx = 0; idx < 8; idx++) {
                snd_cs46xx_poke(chip, BA1_DREG, DREG_REGID_TRAP_SELECT + idx);
                snd_cs46xx_poke(chip, BA1_TWPR, 0xFFFF);
        }
        snd_cs46xx_poke(chip, BA1_DREG, 0);

        /*
         *  Set the frame timer to reflect the number of cycles per frame.
         */
        snd_cs46xx_poke(chip, BA1_FRMT, 0xadf);
}

static int cs46xx_wait_for_fifo(struct snd_cs46xx * chip,int retry_timeout) 
{
        u32 i, status = 0;
        /*
         * Make sure the previous FIFO write operation has completed.
         */
        for(i = 0; i < 50; i++){
                status = snd_cs46xx_peekBA0(chip, BA0_SERBST);
    
                if( !(status & SERBST_WBSY) )
                        break;

                mdelay(retry_timeout);
        }
  
        if(status & SERBST_WBSY) {
                snd_printk( KERN_ERR "cs46xx: failure waiting for FIFO command to complete\n");

                return -EINVAL;
        }

        return 0;
}

static void snd_cs46xx_clear_serial_FIFOs(struct snd_cs46xx *chip)
{
        int idx, powerdown = 0;
        unsigned int tmp;

        /*
         *  See if the devices are powered down.  If so, we must power them up first
         *  or they will not respond.
         */
        tmp = snd_cs46xx_peekBA0(chip, BA0_CLKCR1);
        if (!(tmp & CLKCR1_SWCE)) {
                snd_cs46xx_pokeBA0(chip, BA0_CLKCR1, tmp | CLKCR1_SWCE);
                powerdown = 1;
        }

        /*
         *  We want to clear out the serial port FIFOs so we don't end up playing
         *  whatever random garbage happens to be in them.  We fill the sample FIFOS
         *  with zero (silence).
         */
        snd_cs46xx_pokeBA0(chip, BA0_SERBWP, 0);

        /*
         *  Fill all 256 sample FIFO locations.
         */
        for (idx = 0; idx < 0xFF; idx++) {
                /*
                 *  Make sure the previous FIFO write operation has completed.
                 */
                if (cs46xx_wait_for_fifo(chip,1)) {
                        snd_printdd ("failed waiting for FIFO at addr (%02X)\n",idx);

                        if (powerdown)
                                snd_cs46xx_pokeBA0(chip, BA0_CLKCR1, tmp);
          
                        break;
                }
                /*
                 *  Write the serial port FIFO index.
                 */
                snd_cs46xx_pokeBA0(chip, BA0_SERBAD, idx);
                /*
                 *  Tell the serial port to load the new value into the FIFO location.
                 */
                snd_cs46xx_pokeBA0(chip, BA0_SERBCM, SERBCM_WRC);
        }
        /*
         *  Now, if we powered up the devices, then power them back down again.
         *  This is kinda ugly, but should never happen.
         */
        if (powerdown)
                snd_cs46xx_pokeBA0(chip, BA0_CLKCR1, tmp);
}

static void snd_cs46xx_proc_start(struct snd_cs46xx *chip)
{
        int cnt;

        /*
         *  Set the frame timer to reflect the number of cycles per frame.
         */
        snd_cs46xx_poke(chip, BA1_FRMT, 0xadf);
        /*
         *  Turn on the run, run at frame, and DMA enable bits in the local copy of
         *  the SP control register.
         */
        snd_cs46xx_poke(chip, BA1_SPCR, SPCR_RUN | SPCR_RUNFR | SPCR_DRQEN);
        /*
         *  Wait until the run at frame bit resets itself in the SP control
         *  register.
         */
        for (cnt = 0; cnt < 25; cnt++) {
                udelay(50);
                if (!(snd_cs46xx_peek(chip, BA1_SPCR) & SPCR_RUNFR))
                        break;
        }

        if (snd_cs46xx_peek(chip, BA1_SPCR) & SPCR_RUNFR)
                snd_printk(KERN_ERR "SPCR_RUNFR never reset\n");
}

static void snd_cs46xx_proc_stop(struct snd_cs46xx *chip)
{
        /*
         *  Turn off the run, run at frame, and DMA enable bits in the local copy of
         *  the SP control register.
         */
        snd_cs46xx_poke(chip, BA1_SPCR, 0);
}

/*
 *  Sample rate routines
 */

#define GOF_PER_SEC 200

static void snd_cs46xx_set_play_sample_rate(struct snd_cs46xx *chip, unsigned int rate)
{
        unsigned long flags;
        unsigned int tmp1, tmp2;
        unsigned int phiIncr;
        unsigned int correctionPerGOF, correctionPerSec;

        /*
         *  Compute the values used to drive the actual sample rate conversion.
         *  The following formulas are being computed, using inline assembly
         *  since we need to use 64 bit arithmetic to compute the values:
         *
         *  phiIncr = floor((Fs,in * 2^26) / Fs,out)
         *  correctionPerGOF = floor((Fs,in * 2^26 - Fs,out * phiIncr) /
         *                                   GOF_PER_SEC)
         *  ulCorrectionPerSec = Fs,in * 2^26 - Fs,out * phiIncr -M
         *                       GOF_PER_SEC * correctionPerGOF
         *
         *  i.e.
         *
         *  phiIncr:other = dividend:remainder((Fs,in * 2^26) / Fs,out)
         *  correctionPerGOF:correctionPerSec =
         *      dividend:remainder(ulOther / GOF_PER_SEC)
         */
        tmp1 = rate << 16;
        phiIncr = tmp1 / 48000;
        tmp1 -= phiIncr * 48000;
        tmp1 <<= 10;
        phiIncr <<= 10;
        tmp2 = tmp1 / 48000;
        phiIncr += tmp2;
        tmp1 -= tmp2 * 48000;
        correctionPerGOF = tmp1 / GOF_PER_SEC;
        tmp1 -= correctionPerGOF * GOF_PER_SEC;
        correctionPerSec = tmp1;

        /*
         *  Fill in the SampleRateConverter control block.
         */
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_cs46xx_poke(chip, BA1_PSRC,
          ((correctionPerSec << 16) & 0xFFFF0000) | (correctionPerGOF & 0xFFFF));
        snd_cs46xx_poke(chip, BA1_PPI, phiIncr);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
}

static void snd_cs46xx_set_capture_sample_rate(struct snd_cs46xx *chip, unsigned int rate)
{
        unsigned long flags;
        unsigned int phiIncr, coeffIncr, tmp1, tmp2;
        unsigned int correctionPerGOF, correctionPerSec, initialDelay;
        unsigned int frameGroupLength, cnt;

        /*
         *  We can only decimate by up to a factor of 1/9th the hardware rate.
         *  Correct the value if an attempt is made to stray outside that limit.
         */
        if ((rate * 9) < 48000)
                rate = 48000 / 9;

        /*
         *  We can not capture at at rate greater than the Input Rate (48000).
         *  Return an error if an attempt is made to stray outside that limit.
         */
        if (rate > 48000)
                rate = 48000;

        /*
         *  Compute the values used to drive the actual sample rate conversion.
         *  The following formulas are being computed, using inline assembly
         *  since we need to use 64 bit arithmetic to compute the values:
         *
         *     coeffIncr = -floor((Fs,out * 2^23) / Fs,in)
         *     phiIncr = floor((Fs,in * 2^26) / Fs,out)
         *     correctionPerGOF = floor((Fs,in * 2^26 - Fs,out * phiIncr) /
         *                                GOF_PER_SEC)
         *     correctionPerSec = Fs,in * 2^26 - Fs,out * phiIncr -
         *                          GOF_PER_SEC * correctionPerGOF
         *     initialDelay = ceil((24 * Fs,in) / Fs,out)
         *
         * i.e.
         *
         *     coeffIncr = neg(dividend((Fs,out * 2^23) / Fs,in))
         *     phiIncr:ulOther = dividend:remainder((Fs,in * 2^26) / Fs,out)
         *     correctionPerGOF:correctionPerSec =
         *          dividend:remainder(ulOther / GOF_PER_SEC)
         *     initialDelay = dividend(((24 * Fs,in) + Fs,out - 1) / Fs,out)
         */

        tmp1 = rate << 16;
        coeffIncr = tmp1 / 48000;
        tmp1 -= coeffIncr * 48000;
        tmp1 <<= 7;
        coeffIncr <<= 7;
        coeffIncr += tmp1 / 48000;
        coeffIncr ^= 0xFFFFFFFF;
        coeffIncr++;
        tmp1 = 48000 << 16;
        phiIncr = tmp1 / rate;
        tmp1 -= phiIncr * rate;
        tmp1 <<= 10;
        phiIncr <<= 10;
        tmp2 = tmp1 / rate;
        phiIncr += tmp2;
        tmp1 -= tmp2 * rate;
        correctionPerGOF = tmp1 / GOF_PER_SEC;
        tmp1 -= correctionPerGOF * GOF_PER_SEC;
        correctionPerSec = tmp1;
        initialDelay = ((48000 * 24) + rate - 1) / rate;

        /*
         *  Fill in the VariDecimate control block.
         */
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_cs46xx_poke(chip, BA1_CSRC,
                ((correctionPerSec << 16) & 0xFFFF0000) | (correctionPerGOF & 0xFFFF));
        snd_cs46xx_poke(chip, BA1_CCI, coeffIncr);
        snd_cs46xx_poke(chip, BA1_CD,
                (((BA1_VARIDEC_BUF_1 + (initialDelay << 2)) << 16) & 0xFFFF0000) | 0x80);
        snd_cs46xx_poke(chip, BA1_CPI, phiIncr);
        spin_unlock_irqrestore(&chip->reg_lock, flags);

        /*
         *  Figure out the frame group length for the write back task.  Basically,
         *  this is just the factors of 24000 (2^6*3*5^3) that are not present in
         *  the output sample rate.
         */
        frameGroupLength = 1;
        for (cnt = 2; cnt <= 64; cnt *= 2) {
                if (((rate / cnt) * cnt) != rate)
                        frameGroupLength *= 2;
        }
        if (((rate / 3) * 3) != rate) {
                frameGroupLength *= 3;
        }
        for (cnt = 5; cnt <= 125; cnt *= 5) {
                if (((rate / cnt) * cnt) != rate) 
                        frameGroupLength *= 5;
        }

        /*
         * Fill in the WriteBack control block.
         */
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_cs46xx_poke(chip, BA1_CFG1, frameGroupLength);
        snd_cs46xx_poke(chip, BA1_CFG2, (0x00800000 | frameGroupLength));
        snd_cs46xx_poke(chip, BA1_CCST, 0x0000FFFF);
        snd_cs46xx_poke(chip, BA1_CSPB, ((65536 * rate) / 24000));
        snd_cs46xx_poke(chip, (BA1_CSPB + 4), 0x0000FFFF);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
}

/*
 *  PCM part
 */

static void snd_cs46xx_pb_trans_copy(struct snd_pcm_substream *substream,
                                     struct snd_pcm_indirect *rec, size_t bytes)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_cs46xx_pcm * cpcm = runtime->private_data;
        memcpy(cpcm->hw_buf.area + rec->hw_data, runtime->dma_area + rec->sw_data, bytes);
}

static int snd_cs46xx_playback_transfer(struct snd_pcm_substream *substream)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_cs46xx_pcm * cpcm = runtime->private_data;
        snd_pcm_indirect_playback_transfer(substream, &cpcm->pcm_rec, snd_cs46xx_pb_trans_copy);
        return 0;
}

static void snd_cs46xx_cp_trans_copy(struct snd_pcm_substream *substream,
                                     struct snd_pcm_indirect *rec, size_t bytes)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        memcpy(runtime->dma_area + rec->sw_data,
               chip->capt.hw_buf.area + rec->hw_data, bytes);
}

static int snd_cs46xx_capture_transfer(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        snd_pcm_indirect_capture_transfer(substream, &chip->capt.pcm_rec, snd_cs46xx_cp_trans_copy);
        return 0;
}

static snd_pcm_uframes_t snd_cs46xx_playback_direct_pointer(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        size_t ptr;
        struct snd_cs46xx_pcm *cpcm = substream->runtime->private_data;

        if (snd_BUG_ON(!cpcm->pcm_channel))
                return -ENXIO;

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        ptr = snd_cs46xx_peek(chip, (cpcm->pcm_channel->pcm_reader_scb->address + 2) << 2);
#else
        ptr = snd_cs46xx_peek(chip, BA1_PBA);
#endif
        ptr -= cpcm->hw_buf.addr;
        return ptr >> cpcm->shift;
}

static snd_pcm_uframes_t snd_cs46xx_playback_indirect_pointer(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        size_t ptr;
        struct snd_cs46xx_pcm *cpcm = substream->runtime->private_data;

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        if (snd_BUG_ON(!cpcm->pcm_channel))
                return -ENXIO;
        ptr = snd_cs46xx_peek(chip, (cpcm->pcm_channel->pcm_reader_scb->address + 2) << 2);
#else
        ptr = snd_cs46xx_peek(chip, BA1_PBA);
#endif
        ptr -= cpcm->hw_buf.addr;
        return snd_pcm_indirect_playback_pointer(substream, &cpcm->pcm_rec, ptr);
}

static snd_pcm_uframes_t snd_cs46xx_capture_direct_pointer(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        size_t ptr = snd_cs46xx_peek(chip, BA1_CBA) - chip->capt.hw_buf.addr;
        return ptr >> chip->capt.shift;
}

static snd_pcm_uframes_t snd_cs46xx_capture_indirect_pointer(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        size_t ptr = snd_cs46xx_peek(chip, BA1_CBA) - chip->capt.hw_buf.addr;
        return snd_pcm_indirect_capture_pointer(substream, &chip->capt.pcm_rec, ptr);
}

static int snd_cs46xx_playback_trigger(struct snd_pcm_substream *substream,
                                       int cmd)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        /*struct snd_pcm_runtime *runtime = substream->runtime;*/
        int result = 0;

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        struct snd_cs46xx_pcm *cpcm = substream->runtime->private_data;
        if (! cpcm->pcm_channel) {
                return -ENXIO;
        }
#endif
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
#ifdef CONFIG_SND_CS46XX_NEW_DSP
                /* magic value to unmute PCM stream  playback volume */
                snd_cs46xx_poke(chip, (cpcm->pcm_channel->pcm_reader_scb->address + 
                                       SCBVolumeCtrl) << 2, 0x80008000);

                if (cpcm->pcm_channel->unlinked)
                        cs46xx_dsp_pcm_link(chip,cpcm->pcm_channel);

                if (substream->runtime->periods != CS46XX_FRAGS)
                        snd_cs46xx_playback_transfer(substream);
#else
                spin_lock(&chip->reg_lock);
                if (substream->runtime->periods != CS46XX_FRAGS)
                        snd_cs46xx_playback_transfer(substream);
                { unsigned int tmp;
                tmp = snd_cs46xx_peek(chip, BA1_PCTL);
                tmp &= 0x0000ffff;
                snd_cs46xx_poke(chip, BA1_PCTL, chip->play_ctl | tmp);
                }
                spin_unlock(&chip->reg_lock);
#endif
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
#ifdef CONFIG_SND_CS46XX_NEW_DSP
                /* magic mute channel */
                snd_cs46xx_poke(chip, (cpcm->pcm_channel->pcm_reader_scb->address + 
                                       SCBVolumeCtrl) << 2, 0xffffffff);

                if (!cpcm->pcm_channel->unlinked)
                        cs46xx_dsp_pcm_unlink(chip,cpcm->pcm_channel);
#else
                spin_lock(&chip->reg_lock);
                { unsigned int tmp;
                tmp = snd_cs46xx_peek(chip, BA1_PCTL);
                tmp &= 0x0000ffff;
                snd_cs46xx_poke(chip, BA1_PCTL, tmp);
                }
                spin_unlock(&chip->reg_lock);
#endif
                break;
        default:
                result = -EINVAL;
                break;
        }

        return result;
}

static int snd_cs46xx_capture_trigger(struct snd_pcm_substream *substream,
                                      int cmd)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        unsigned int tmp;
        int result = 0;

        spin_lock(&chip->reg_lock);
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
                tmp = snd_cs46xx_peek(chip, BA1_CCTL);
                tmp &= 0xffff0000;
                snd_cs46xx_poke(chip, BA1_CCTL, chip->capt.ctl | tmp);
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
                tmp = snd_cs46xx_peek(chip, BA1_CCTL);
                tmp &= 0xffff0000;
                snd_cs46xx_poke(chip, BA1_CCTL, tmp);
                break;
        default:
                result = -EINVAL;
                break;
        }
        spin_unlock(&chip->reg_lock);

        return result;
}

#ifdef CONFIG_SND_CS46XX_NEW_DSP
static int _cs46xx_adjust_sample_rate (struct snd_cs46xx *chip, struct snd_cs46xx_pcm *cpcm,
                                       int sample_rate) 
{

        /* If PCMReaderSCB and SrcTaskSCB not created yet ... */
        if ( cpcm->pcm_channel == NULL) {
                cpcm->pcm_channel = cs46xx_dsp_create_pcm_channel (chip, sample_rate, 
                                                                   cpcm, cpcm->hw_buf.addr,cpcm->pcm_channel_id);
                if (cpcm->pcm_channel == NULL) {
                        snd_printk(KERN_ERR "cs46xx: failed to create virtual PCM channel\n");
                        return -ENOMEM;
                }
                cpcm->pcm_channel->sample_rate = sample_rate;
        } else
        /* if sample rate is changed */
        if ((int)cpcm->pcm_channel->sample_rate != sample_rate) {
                int unlinked = cpcm->pcm_channel->unlinked;
                cs46xx_dsp_destroy_pcm_channel (chip,cpcm->pcm_channel);

                if ( (cpcm->pcm_channel = cs46xx_dsp_create_pcm_channel (chip, sample_rate, cpcm, 
                                                                         cpcm->hw_buf.addr,
                                                                         cpcm->pcm_channel_id)) == NULL) {
                        snd_printk(KERN_ERR "cs46xx: failed to re-create virtual PCM channel\n");
                        return -ENOMEM;
                }

                if (!unlinked) cs46xx_dsp_pcm_link (chip,cpcm->pcm_channel);
                cpcm->pcm_channel->sample_rate = sample_rate;
        }

        return 0;
}
#endif


static int snd_cs46xx_playback_hw_params(struct snd_pcm_substream *substream,
                                         struct snd_pcm_hw_params *hw_params)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_cs46xx_pcm *cpcm;
        int err;
#ifdef CONFIG_SND_CS46XX_NEW_DSP
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        int sample_rate = params_rate(hw_params);
        int period_size = params_period_bytes(hw_params);
#endif
        cpcm = runtime->private_data;

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        if (snd_BUG_ON(!sample_rate))
                return -ENXIO;

        mutex_lock(&chip->spos_mutex);

        if (_cs46xx_adjust_sample_rate (chip,cpcm,sample_rate)) {
                mutex_unlock(&chip->spos_mutex);
                return -ENXIO;
        }

        snd_BUG_ON(!cpcm->pcm_channel);
        if (!cpcm->pcm_channel) {
                mutex_unlock(&chip->spos_mutex);
                return -ENXIO;
        }


        if (cs46xx_dsp_pcm_channel_set_period (chip,cpcm->pcm_channel,period_size)) {
                 mutex_unlock(&chip->spos_mutex);
                 return -EINVAL;
         }

        snd_printdd ("period_size (%d), periods (%d) buffer_size(%d)\n",
                     period_size, params_periods(hw_params),
                     params_buffer_bytes(hw_params));
#endif

        if (params_periods(hw_params) == CS46XX_FRAGS) {
                if (runtime->dma_area != cpcm->hw_buf.area)
                        snd_pcm_lib_free_pages(substream);
                runtime->dma_area = cpcm->hw_buf.area;
                runtime->dma_addr = cpcm->hw_buf.addr;
                runtime->dma_bytes = cpcm->hw_buf.bytes;


#ifdef CONFIG_SND_CS46XX_NEW_DSP
                if (cpcm->pcm_channel_id == DSP_PCM_MAIN_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_ops;
                } else if (cpcm->pcm_channel_id == DSP_PCM_REAR_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_rear_ops;
                } else if (cpcm->pcm_channel_id == DSP_PCM_CENTER_LFE_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_clfe_ops;
                } else if (cpcm->pcm_channel_id == DSP_IEC958_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_iec958_ops;
                } else {
                        snd_BUG();
                }
#else
                substream->ops = &snd_cs46xx_playback_ops;
#endif

        } else {
                if (runtime->dma_area == cpcm->hw_buf.area) {
                        runtime->dma_area = NULL;
                        runtime->dma_addr = 0;
                        runtime->dma_bytes = 0;
                }
                if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0) {
#ifdef CONFIG_SND_CS46XX_NEW_DSP
                        mutex_unlock(&chip->spos_mutex);
#endif
                        return err;
                }

#ifdef CONFIG_SND_CS46XX_NEW_DSP
                if (cpcm->pcm_channel_id == DSP_PCM_MAIN_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_indirect_ops;
                } else if (cpcm->pcm_channel_id == DSP_PCM_REAR_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_indirect_rear_ops;
                } else if (cpcm->pcm_channel_id == DSP_PCM_CENTER_LFE_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_indirect_clfe_ops;
                } else if (cpcm->pcm_channel_id == DSP_IEC958_CHANNEL) {
                        substream->ops = &snd_cs46xx_playback_indirect_iec958_ops;
                } else {
                        snd_BUG();
                }
#else
                substream->ops = &snd_cs46xx_playback_indirect_ops;
#endif

        }

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        mutex_unlock(&chip->spos_mutex);

#endif

        return 0;
}

static int snd_cs46xx_playback_hw_free(struct snd_pcm_substream *substream)
{
        /*struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);*/
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_cs46xx_pcm *cpcm;

        cpcm = runtime->private_data;

        /* if play_back open fails, then this function
           is called and cpcm can actually be NULL here */
        if (!cpcm) return -ENXIO;

        if (runtime->dma_area != cpcm->hw_buf.area)
                snd_pcm_lib_free_pages(substream);
    
        runtime->dma_area = NULL;
        runtime->dma_addr = 0;
        runtime->dma_bytes = 0;

        return 0;
}

static int snd_cs46xx_playback_prepare(struct snd_pcm_substream *substream)
{
        unsigned int tmp;
        unsigned int pfie;
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_cs46xx_pcm *cpcm;

        cpcm = runtime->private_data;

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        if (snd_BUG_ON(!cpcm->pcm_channel))
                return -ENXIO;

        pfie = snd_cs46xx_peek(chip, (cpcm->pcm_channel->pcm_reader_scb->address + 1) << 2 );
        pfie &= ~0x0000f03f;
#else
        /* old dsp */
        pfie = snd_cs46xx_peek(chip, BA1_PFIE);
        pfie &= ~0x0000f03f;
#endif

        cpcm->shift = 2;
        /* if to convert from stereo to mono */
        if (runtime->channels == 1) {
                cpcm->shift--;
                pfie |= 0x00002000;
        }
        /* if to convert from 8 bit to 16 bit */
        if (snd_pcm_format_width(runtime->format) == 8) {
                cpcm->shift--;
                pfie |= 0x00001000;
        }
        /* if to convert to unsigned */
        if (snd_pcm_format_unsigned(runtime->format))
                pfie |= 0x00008000;

        /* Never convert byte order when sample stream is 8 bit */
        if (snd_pcm_format_width(runtime->format) != 8) {
                /* convert from big endian to little endian */
                if (snd_pcm_format_big_endian(runtime->format))
                        pfie |= 0x00004000;
        }
        
        memset(&cpcm->pcm_rec, 0, sizeof(cpcm->pcm_rec));
        cpcm->pcm_rec.sw_buffer_size = snd_pcm_lib_buffer_bytes(substream);
        cpcm->pcm_rec.hw_buffer_size = runtime->period_size * CS46XX_FRAGS << cpcm->shift;

#ifdef CONFIG_SND_CS46XX_NEW_DSP

        tmp = snd_cs46xx_peek(chip, (cpcm->pcm_channel->pcm_reader_scb->address) << 2);
        tmp &= ~0x000003ff;
        tmp |= (4 << cpcm->shift) - 1;
        /* playback transaction count register */
        snd_cs46xx_poke(chip, (cpcm->pcm_channel->pcm_reader_scb->address) << 2, tmp);

        /* playback format && interrupt enable */
        snd_cs46xx_poke(chip, (cpcm->pcm_channel->pcm_reader_scb->address + 1) << 2, pfie | cpcm->pcm_channel->pcm_slot);
#else
        snd_cs46xx_poke(chip, BA1_PBA, cpcm->hw_buf.addr);
        tmp = snd_cs46xx_peek(chip, BA1_PDTC);
        tmp &= ~0x000003ff;
        tmp |= (4 << cpcm->shift) - 1;
        snd_cs46xx_poke(chip, BA1_PDTC, tmp);
        snd_cs46xx_poke(chip, BA1_PFIE, pfie);
        snd_cs46xx_set_play_sample_rate(chip, runtime->rate);
#endif

        return 0;
}

static int snd_cs46xx_capture_hw_params(struct snd_pcm_substream *substream,
                                        struct snd_pcm_hw_params *hw_params)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        cs46xx_dsp_pcm_ostream_set_period (chip, params_period_bytes(hw_params));
#endif
        if (runtime->periods == CS46XX_FRAGS) {
                if (runtime->dma_area != chip->capt.hw_buf.area)
                        snd_pcm_lib_free_pages(substream);
                runtime->dma_area = chip->capt.hw_buf.area;
                runtime->dma_addr = chip->capt.hw_buf.addr;
                runtime->dma_bytes = chip->capt.hw_buf.bytes;
                substream->ops = &snd_cs46xx_capture_ops;
        } else {
                if (runtime->dma_area == chip->capt.hw_buf.area) {
                        runtime->dma_area = NULL;
                        runtime->dma_addr = 0;
                        runtime->dma_bytes = 0;
                }
                if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
                        return err;
                substream->ops = &snd_cs46xx_capture_indirect_ops;
        }

        return 0;
}

static int snd_cs46xx_capture_hw_free(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;

        if (runtime->dma_area != chip->capt.hw_buf.area)
                snd_pcm_lib_free_pages(substream);
        runtime->dma_area = NULL;
        runtime->dma_addr = 0;
        runtime->dma_bytes = 0;

        return 0;
}

static int snd_cs46xx_capture_prepare(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;

        snd_cs46xx_poke(chip, BA1_CBA, chip->capt.hw_buf.addr);
        chip->capt.shift = 2;
        memset(&chip->capt.pcm_rec, 0, sizeof(chip->capt.pcm_rec));
        chip->capt.pcm_rec.sw_buffer_size = snd_pcm_lib_buffer_bytes(substream);
        chip->capt.pcm_rec.hw_buffer_size = runtime->period_size * CS46XX_FRAGS << 2;
        snd_cs46xx_set_capture_sample_rate(chip, runtime->rate);

        return 0;
}

static irqreturn_t snd_cs46xx_interrupt(int irq, void *dev_id)
{
        struct snd_cs46xx *chip = dev_id;
        u32 status1;
#ifdef CONFIG_SND_CS46XX_NEW_DSP
        struct dsp_spos_instance * ins = chip->dsp_spos_instance;
        u32 status2;
        int i;
        struct snd_cs46xx_pcm *cpcm = NULL;
#endif

        /*
         *  Read the Interrupt Status Register to clear the interrupt
         */
        status1 = snd_cs46xx_peekBA0(chip, BA0_HISR);
        if ((status1 & 0x7fffffff) == 0) {
                snd_cs46xx_pokeBA0(chip, BA0_HICR, HICR_CHGM | HICR_IEV);
                return IRQ_NONE;
        }

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        status2 = snd_cs46xx_peekBA0(chip, BA0_HSR0);

        for (i = 0; i < DSP_MAX_PCM_CHANNELS; ++i) {
                if (i <= 15) {
                        if ( status1 & (1 << i) ) {
                                if (i == CS46XX_DSP_CAPTURE_CHANNEL) {
                                        if (chip->capt.substream)
                                                snd_pcm_period_elapsed(chip->capt.substream);
                                } else {
                                        if (ins->pcm_channels[i].active &&
                                            ins->pcm_channels[i].private_data &&
                                            !ins->pcm_channels[i].unlinked) {
                                                cpcm = ins->pcm_channels[i].private_data;
                                                snd_pcm_period_elapsed(cpcm->substream);
                                        }
                                }
                        }
                } else {
                        if ( status2 & (1 << (i - 16))) {
                                if (ins->pcm_channels[i].active && 
                                    ins->pcm_channels[i].private_data &&
                                    !ins->pcm_channels[i].unlinked) {
                                        cpcm = ins->pcm_channels[i].private_data;
                                        snd_pcm_period_elapsed(cpcm->substream);
                                }
                        }
                }
        }

#else
        /* old dsp */
        if ((status1 & HISR_VC0) && chip->playback_pcm) {
                if (chip->playback_pcm->substream)
                        snd_pcm_period_elapsed(chip->playback_pcm->substream);
        }
        if ((status1 & HISR_VC1) && chip->pcm) {
                if (chip->capt.substream)
                        snd_pcm_period_elapsed(chip->capt.substream);
        }
#endif

        if ((status1 & HISR_MIDI) && chip->rmidi) {
                unsigned char c;
                
                spin_lock(&chip->reg_lock);
                while ((snd_cs46xx_peekBA0(chip, BA0_MIDSR) & MIDSR_RBE) == 0) {
                        c = snd_cs46xx_peekBA0(chip, BA0_MIDRP);
                        if ((chip->midcr & MIDCR_RIE) == 0)
                                continue;
                        snd_rawmidi_receive(chip->midi_input, &c, 1);
                }
                while ((snd_cs46xx_peekBA0(chip, BA0_MIDSR) & MIDSR_TBF) == 0) {
                        if ((chip->midcr & MIDCR_TIE) == 0)
                                break;
                        if (snd_rawmidi_transmit(chip->midi_output, &c, 1) != 1) {
                                chip->midcr &= ~MIDCR_TIE;
                                snd_cs46xx_pokeBA0(chip, BA0_MIDCR, chip->midcr);
                                break;
                        }
                        snd_cs46xx_pokeBA0(chip, BA0_MIDWP, c);
                }
                spin_unlock(&chip->reg_lock);
        }
        /*
         *  EOI to the PCI part....reenables interrupts
         */
        snd_cs46xx_pokeBA0(chip, BA0_HICR, HICR_CHGM | HICR_IEV);

        return IRQ_HANDLED;
}

static struct snd_pcm_hardware snd_cs46xx_playback =
{
        .info =                 (SNDRV_PCM_INFO_MMAP |
                                 SNDRV_PCM_INFO_INTERLEAVED | 
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER /*|*/
                                 /*SNDRV_PCM_INFO_RESUME*/),
        .formats =              (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
                                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
                                 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE),
        .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             5500,
        .rate_max =             48000,
        .channels_min =         1,
        .channels_max =         2,
        .buffer_bytes_max =     (256 * 1024),
        .period_bytes_min =     CS46XX_MIN_PERIOD_SIZE,
        .period_bytes_max =     CS46XX_MAX_PERIOD_SIZE,
        .periods_min =          CS46XX_FRAGS,
        .periods_max =          1024,
        .fifo_size =            0,
};

static struct snd_pcm_hardware snd_cs46xx_capture =
{
        .info =                 (SNDRV_PCM_INFO_MMAP |
                                 SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER /*|*/
                                 /*SNDRV_PCM_INFO_RESUME*/),
        .formats =              SNDRV_PCM_FMTBIT_S16_LE,
        .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             5500,
        .rate_max =             48000,
        .channels_min =         2,
        .channels_max =         2,
        .buffer_bytes_max =     (256 * 1024),
        .period_bytes_min =     CS46XX_MIN_PERIOD_SIZE,
        .period_bytes_max =     CS46XX_MAX_PERIOD_SIZE,
        .periods_min =          CS46XX_FRAGS,
        .periods_max =          1024,
        .fifo_size =            0,
};

#ifdef CONFIG_SND_CS46XX_NEW_DSP

static unsigned int period_sizes[] = { 32, 64, 128, 256, 512, 1024, 2048 };

static struct snd_pcm_hw_constraint_list hw_constraints_period_sizes = {
        .count = ARRAY_SIZE(period_sizes),
        .list = period_sizes,
        .mask = 0
};

#endif

static void snd_cs46xx_pcm_free_substream(struct snd_pcm_runtime *runtime)
{
        kfree(runtime->private_data);
}

static int _cs46xx_playback_open_channel (struct snd_pcm_substream *substream,int pcm_channel_id)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        struct snd_cs46xx_pcm * cpcm;
        struct snd_pcm_runtime *runtime = substream->runtime;

        cpcm = kzalloc(sizeof(*cpcm), GFP_KERNEL);
        if (cpcm == NULL)
                return -ENOMEM;
        if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
                                PAGE_SIZE, &cpcm->hw_buf) < 0) {
                kfree(cpcm);
                return -ENOMEM;
        }

        runtime->hw = snd_cs46xx_playback;
        runtime->private_data = cpcm;
        runtime->private_free = snd_cs46xx_pcm_free_substream;

        cpcm->substream = substream;
#ifdef CONFIG_SND_CS46XX_NEW_DSP
        mutex_lock(&chip->spos_mutex);
        cpcm->pcm_channel = NULL; 
        cpcm->pcm_channel_id = pcm_channel_id;


        snd_pcm_hw_constraint_list(runtime, 0,
                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
                                   &hw_constraints_period_sizes);

        mutex_unlock(&chip->spos_mutex);
#else
        chip->playback_pcm = cpcm; /* HACK */
#endif

        if (chip->accept_valid)
                substream->runtime->hw.info |= SNDRV_PCM_INFO_MMAP_VALID;
        chip->active_ctrl(chip, 1);

        return 0;
}

static int snd_cs46xx_playback_open(struct snd_pcm_substream *substream)
{
        snd_printdd("open front channel\n");
        return _cs46xx_playback_open_channel(substream,DSP_PCM_MAIN_CHANNEL);
}

#ifdef CONFIG_SND_CS46XX_NEW_DSP
static int snd_cs46xx_playback_open_rear(struct snd_pcm_substream *substream)
{
        snd_printdd("open rear channel\n");

        return _cs46xx_playback_open_channel(substream,DSP_PCM_REAR_CHANNEL);
}

static int snd_cs46xx_playback_open_clfe(struct snd_pcm_substream *substream)
{
        snd_printdd("open center - LFE channel\n");

        return _cs46xx_playback_open_channel(substream,DSP_PCM_CENTER_LFE_CHANNEL);
}

static int snd_cs46xx_playback_open_iec958(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);

        snd_printdd("open raw iec958 channel\n");

        mutex_lock(&chip->spos_mutex);
        cs46xx_iec958_pre_open (chip);
        mutex_unlock(&chip->spos_mutex);

        return _cs46xx_playback_open_channel(substream,DSP_IEC958_CHANNEL);
}

static int snd_cs46xx_playback_close(struct snd_pcm_substream *substream);

static int snd_cs46xx_playback_close_iec958(struct snd_pcm_substream *substream)
{
        int err;
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
  
        snd_printdd("close raw iec958 channel\n");

        err = snd_cs46xx_playback_close(substream);

        mutex_lock(&chip->spos_mutex);
        cs46xx_iec958_post_close (chip);
        mutex_unlock(&chip->spos_mutex);

        return err;
}
#endif

static int snd_cs46xx_capture_open(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);

        if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
                                PAGE_SIZE, &chip->capt.hw_buf) < 0)
                return -ENOMEM;
        chip->capt.substream = substream;
        substream->runtime->hw = snd_cs46xx_capture;

        if (chip->accept_valid)
                substream->runtime->hw.info |= SNDRV_PCM_INFO_MMAP_VALID;

        chip->active_ctrl(chip, 1);

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        snd_pcm_hw_constraint_list(substream->runtime, 0,
                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
                                   &hw_constraints_period_sizes);
#endif
        return 0;
}

static int snd_cs46xx_playback_close(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_cs46xx_pcm * cpcm;

        cpcm = runtime->private_data;

        /* when playback_open fails, then cpcm can be NULL */
        if (!cpcm) return -ENXIO;

#ifdef CONFIG_SND_CS46XX_NEW_DSP
        mutex_lock(&chip->spos_mutex);
        if (cpcm->pcm_channel) {
                cs46xx_dsp_destroy_pcm_channel(chip,cpcm->pcm_channel);
                cpcm->pcm_channel = NULL;
        }
        mutex_unlock(&chip->spos_mutex);
#else
        chip->playback_pcm = NULL;
#endif

        cpcm->substream = NULL;
        snd_dma_free_pages(&cpcm->hw_buf);
        chip->active_ctrl(chip, -1);

        return 0;
}

static int snd_cs46xx_capture_close(struct snd_pcm_substream *substream)
{
        struct snd_cs46xx *chip = snd_pcm_substream_chip(substream);

        chip->capt.substream = NULL;
        snd_dma_free_pages(&chip->capt.hw_buf);
        chip->active_ctrl(chip, -1);

        return 0;
}

#ifdef CONFIG_SND_CS46XX_NEW_DSP
static struct snd_pcm_ops snd_cs46xx_playback_rear_ops = {
        .open =                 snd_cs46xx_playback_open_rear,
        .close =                snd_cs46xx_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_direct_pointer,
};

static struct snd_pcm_ops snd_cs46xx_playback_indirect_rear_ops = {
        .open =                 snd_cs46xx_playback_open_rear,
        .close =                snd_cs46xx_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_indirect_pointer,
        .ack =                  snd_cs46xx_playback_transfer,
};

static struct snd_pcm_ops snd_cs46xx_playback_clfe_ops = {
        .open =                 snd_cs46xx_playback_open_clfe,
        .close =                snd_cs46xx_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_direct_pointer,
};

static struct snd_pcm_ops snd_cs46xx_playback_indirect_clfe_ops = {
        .open =                 snd_cs46xx_playback_open_clfe,
        .close =                snd_cs46xx_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_indirect_pointer,
        .ack =                  snd_cs46xx_playback_transfer,
};

static struct snd_pcm_ops snd_cs46xx_playback_iec958_ops = {
        .open =                 snd_cs46xx_playback_open_iec958,
        .close =                snd_cs46xx_playback_close_iec958,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_direct_pointer,
};

static struct snd_pcm_ops snd_cs46xx_playback_indirect_iec958_ops = {
        .open =                 snd_cs46xx_playback_open_iec958,
        .close =                snd_cs46xx_playback_close_iec958,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_indirect_pointer,
        .ack =                  snd_cs46xx_playback_transfer,
};

#endif

static struct snd_pcm_ops snd_cs46xx_playback_ops = {
        .open =                 snd_cs46xx_playback_open,
        .close =                snd_cs46xx_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_direct_pointer,
};

static struct snd_pcm_ops snd_cs46xx_playback_indirect_ops = {
        .open =                 snd_cs46xx_playback_open,
        .close =                snd_cs46xx_playback_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_playback_hw_params,
        .hw_free =              snd_cs46xx_playback_hw_free,
        .prepare =              snd_cs46xx_playback_prepare,
        .trigger =              snd_cs46xx_playback_trigger,
        .pointer =              snd_cs46xx_playback_indirect_pointer,
        .ack =                  snd_cs46xx_playback_transfer,
};

static struct snd_pcm_ops snd_cs46xx_capture_ops = {
        .open =                 snd_cs46xx_capture_open,
        .close =                snd_cs46xx_capture_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_capture_hw_params,
        .hw_free =              snd_cs46xx_capture_hw_free,
        .prepare =              snd_cs46xx_capture_prepare,
        .trigger =              snd_cs46xx_capture_trigger,
        .pointer =              snd_cs46xx_capture_direct_pointer,
};

static struct snd_pcm_ops snd_cs46xx_capture_indirect_ops = {
        .open =                 snd_cs46xx_capture_open,
        .close =                snd_cs46xx_capture_close,
        .ioctl =                snd_pcm_lib_ioctl,
        .hw_params =            snd_cs46xx_capture_hw_params,
        .hw_free =              snd_cs46xx_capture_hw_free,
        .prepare =              snd_cs46xx_capture_prepare,
        .trigger =              snd_cs46xx_capture_trigger,
        .pointer =              snd_cs46xx_capture_indirect_pointer,
        .ack =                  snd_cs46xx_capture_transfer,
};

#ifdef CONFIG_SND_CS46XX_NEW_DSP
#define MAX_PLAYBACK_CHANNELS   (DSP_MAX_PCM_CHANNELS - 1)
#else
#define MAX_PLAYBACK_CHANNELS   1
#endif

int __devinit snd_cs46xx_pcm(struct snd_cs46xx *chip, int device, struct snd_pcm ** rpcm)
{
        struct snd_pcm *pcm;
        int err;

        if (rpcm)
                *rpcm = NULL;
        if ((err = snd_pcm_new(chip->card, "CS46xx", device, MAX_PLAYBACK_CHANNELS, 1, &pcm)) < 0)
                return err;

        pcm->private_data = chip;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_cs46xx_playback_ops);
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cs46xx_capture_ops);

        /* global setup */
        pcm->info_flags = 0;
        strcpy(pcm->name, "CS46xx");
        chip->pcm = pcm;

        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_pci_data(chip->pci), 64*1024, 256*1024);

        if (rpcm)
                *rpcm = pcm;

        return 0;
}


#ifdef CONFIG_SND_CS46XX_NEW_DSP
int __devinit snd_cs46xx_pcm_rear(struct snd_cs46xx *chip, int device, struct snd_pcm ** rpcm)
{
        struct snd_pcm *pcm;
        int err;

        if (rpcm)
                *rpcm = NULL;

        if ((err = snd_pcm_new(chip->card, "CS46xx - Rear", device, MAX_PLAYBACK_CHANNELS, 0, &pcm)) < 0)
                return err;

        pcm->private_data = chip;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_cs46xx_playback_rear_ops);

        /* global setup */
        pcm->info_flags = 0;
        strcpy(pcm->name, "CS46xx - Rear");
        chip->pcm_rear = pcm;

        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_pci_data(chip->pci), 64*1024, 256*1024);

        if (rpcm)
                *rpcm = pcm;

        return 0;
}

int __devinit snd_cs46xx_pcm_center_lfe(struct snd_cs46xx *chip, int device, struct snd_pcm ** rpcm)
{
        struct snd_pcm *pcm;
        int err;

        if (rpcm)
                *rpcm = NULL;

        if ((err = snd_pcm_new(chip->card, "CS46xx - Center LFE", device, MAX_PLAYBACK_CHANNELS, 0, &pcm)) < 0)
                return err;

        pcm->private_data = chip;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_cs46xx_playback_clfe_ops);

        /* global setup */
        pcm->info_flags = 0;
        strcpy(pcm->name, "CS46xx - Center LFE");
        chip->pcm_center_lfe = pcm;

        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_pci_data(chip->pci), 64*1024, 256*1024);

        if (rpcm)
                *rpcm = pcm;

        return 0;
}

int __devinit snd_cs46xx_pcm_iec958(struct snd_cs46xx *chip, int device, struct snd_pcm ** rpcm)
{
        struct snd_pcm *pcm;
        int err;

        if (rpcm)
                *rpcm = NULL;

        if ((err = snd_pcm_new(chip->card, "CS46xx - IEC958", device, 1, 0, &pcm)) < 0)
                return err;

        pcm->private_data = chip;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_cs46xx_playback_iec958_ops);

        /* global setup */
        pcm->info_flags = 0;
        strcpy(pcm->name, "CS46xx - IEC958");
        chip->pcm_rear = pcm;

        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_pci_data(chip->pci), 64*1024, 256*1024);

        if (rpcm)
                *rpcm = pcm;

        return 0;
}
#endif

/*
 *  Mixer routines
 */
static void snd_cs46xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
{
        struct snd_cs46xx *chip = bus->private_data;

        chip->ac97_bus = NULL;
}

static void snd_cs46xx_mixer_free_ac97(struct snd_ac97 *ac97)
{
        struct snd_cs46xx *chip = ac97->private_data;

        if (snd_BUG_ON(ac97 != chip->ac97[CS46XX_PRIMARY_CODEC_INDEX] &&
                       ac97 != chip->ac97[CS46XX_SECONDARY_CODEC_INDEX]))
                return;

        if (ac97 == chip->ac97[CS46XX_PRIMARY_CODEC_INDEX]) {
                chip->ac97[CS46XX_PRIMARY_CODEC_INDEX] = NULL;
                chip->eapd_switch = NULL;
        }
        else
                chip->ac97[CS46XX_SECONDARY_CODEC_INDEX] = NULL;
}

static int snd_cs46xx_vol_info(struct snd_kcontrol *kcontrol, 
                               struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 2;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 0x7fff;
        return 0;
}

static int snd_cs46xx_vol_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        int reg = kcontrol->private_value;
        unsigned int val = snd_cs46xx_peek(chip, reg);
        ucontrol->value.integer.value[0] = 0xffff - (val >> 16);
        ucontrol->value.integer.value[1] = 0xffff - (val & 0xffff);
        return 0;
}

static int snd_cs46xx_vol_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        int reg = kcontrol->private_value;
        unsigned int val = ((0xffff - ucontrol->value.integer.value[0]) << 16 | 
                            (0xffff - ucontrol->value.integer.value[1]));
        unsigned int old = snd_cs46xx_peek(chip, reg);
        int change = (old != val);

        if (change) {
                snd_cs46xx_poke(chip, reg, val);
        }

        return change;
}

#ifdef CONFIG_SND_CS46XX_NEW_DSP

static int snd_cs46xx_vol_dac_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);

        ucontrol->value.integer.value[0] = chip->dsp_spos_instance->dac_volume_left;
        ucontrol->value.integer.value[1] = chip->dsp_spos_instance->dac_volume_right;

        return 0;
}

static int snd_cs46xx_vol_dac_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        int change = 0;

        if (chip->dsp_spos_instance->dac_volume_right != ucontrol->value.integer.value[0] ||
            chip->dsp_spos_instance->dac_volume_left != ucontrol->value.integer.value[1]) {
                cs46xx_dsp_set_dac_volume(chip,
                                          ucontrol->value.integer.value[0],
                                          ucontrol->value.integer.value[1]);
                change = 1;
        }

        return change;
}

#if 0
static int snd_cs46xx_vol_iec958_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);

        ucontrol->value.integer.value[0] = chip->dsp_spos_instance->spdif_input_volume_left;
        ucontrol->value.integer.value[1] = chip->dsp_spos_instance->spdif_input_volume_right;
        return 0;
}

static int snd_cs46xx_vol_iec958_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        int change = 0;

        if (chip->dsp_spos_instance->spdif_input_volume_left  != ucontrol->value.integer.value[0] ||
            chip->dsp_spos_instance->spdif_input_volume_right!= ucontrol->value.integer.value[1]) {
                cs46xx_dsp_set_iec958_volume (chip,
                                              ucontrol->value.integer.value[0],
                                              ucontrol->value.integer.value[1]);
                change = 1;
        }

        return change;
}
#endif

#define snd_mixer_boolean_info          snd_ctl_boolean_mono_info

static int snd_cs46xx_iec958_get(struct snd_kcontrol *kcontrol, 
                                 struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        int reg = kcontrol->private_value;

        if (reg == CS46XX_MIXER_SPDIF_OUTPUT_ELEMENT)
                ucontrol->value.integer.value[0] = (chip->dsp_spos_instance->spdif_status_out & DSP_SPDIF_STATUS_OUTPUT_ENABLED);
        else
                ucontrol->value.integer.value[0] = chip->dsp_spos_instance->spdif_status_in;

        return 0;
}

static int snd_cs46xx_iec958_put(struct snd_kcontrol *kcontrol, 
                                  struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        int change, res;

        switch (kcontrol->private_value) {
        case CS46XX_MIXER_SPDIF_OUTPUT_ELEMENT:
                mutex_lock(&chip->spos_mutex);
                change = (chip->dsp_spos_instance->spdif_status_out & DSP_SPDIF_STATUS_OUTPUT_ENABLED);
                if (ucontrol->value.integer.value[0] && !change) 
                        cs46xx_dsp_enable_spdif_out(chip);
                else if (change && !ucontrol->value.integer.value[0])
                        cs46xx_dsp_disable_spdif_out(chip);

                res = (change != (chip->dsp_spos_instance->spdif_status_out & DSP_SPDIF_STATUS_OUTPUT_ENABLED));
                mutex_unlock(&chip->spos_mutex);
                break;
        case CS46XX_MIXER_SPDIF_INPUT_ELEMENT:
                change = chip->dsp_spos_instance->spdif_status_in;
                if (ucontrol->value.integer.value[0] && !change) {
                        cs46xx_dsp_enable_spdif_in(chip);
                        /* restore volume */
                }
                else if (change && !ucontrol->value.integer.value[0])
                        cs46xx_dsp_disable_spdif_in(chip);
                
                res = (change != chip->dsp_spos_instance->spdif_status_in);
                break;
        default:
                res = -EINVAL;
                snd_BUG(); /* should never happen ... */
        }

        return res;
}

static int snd_cs46xx_adc_capture_get(struct snd_kcontrol *kcontrol, 
                                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        struct dsp_spos_instance * ins = chip->dsp_spos_instance;

        if (ins->adc_input != NULL) 
                ucontrol->value.integer.value[0] = 1;
        else 
                ucontrol->value.integer.value[0] = 0;
        
        return 0;
}

static int snd_cs46xx_adc_capture_put(struct snd_kcontrol *kcontrol, 
                                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        struct dsp_spos_instance * ins = chip->dsp_spos_instance;
        int change = 0;

        if (ucontrol->value.integer.value[0] && !ins->adc_input) {
                cs46xx_dsp_enable_adc_capture(chip);
                change = 1;
        } else  if (!ucontrol->value.integer.value[0] && ins->adc_input) {
                cs46xx_dsp_disable_adc_capture(chip);
                change = 1;
        }
        return change;
}

static int snd_cs46xx_pcm_capture_get(struct snd_kcontrol *kcontrol, 
                                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        struct dsp_spos_instance * ins = chip->dsp_spos_instance;

        if (ins->pcm_input != NULL) 
                ucontrol->value.integer.value[0] = 1;
        else 
                ucontrol->value.integer.value[0] = 0;

        return 0;
}


static int snd_cs46xx_pcm_capture_put(struct snd_kcontrol *kcontrol, 
                                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        struct dsp_spos_instance * ins = chip->dsp_spos_instance;
        int change = 0;

        if (ucontrol->value.integer.value[0] && !ins->pcm_input) {
                cs46xx_dsp_enable_pcm_capture(chip);
                change = 1;
        } else  if (!ucontrol->value.integer.value[0] && ins->pcm_input) {
                cs46xx_dsp_disable_pcm_capture(chip);
                change = 1;
        }

        return change;
}

static int snd_herc_spdif_select_get(struct snd_kcontrol *kcontrol, 
                                     struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);

        int val1 = snd_cs46xx_peekBA0(chip, BA0_EGPIODR);

        if (val1 & EGPIODR_GPOE0)
                ucontrol->value.integer.value[0] = 1;
        else
                ucontrol->value.integer.value[0] = 0;

        return 0;
}

/*
 *      Game Theatre XP card - EGPIO[0] is used to select SPDIF input optical or coaxial.
 */ 
static int snd_herc_spdif_select_put(struct snd_kcontrol *kcontrol, 
                                       struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        int val1 = snd_cs46xx_peekBA0(chip, BA0_EGPIODR);
        int val2 = snd_cs46xx_peekBA0(chip, BA0_EGPIOPTR);

        if (ucontrol->value.integer.value[0]) {
                /* optical is default */
                snd_cs46xx_pokeBA0(chip, BA0_EGPIODR, 
                                   EGPIODR_GPOE0 | val1);  /* enable EGPIO0 output */
                snd_cs46xx_pokeBA0(chip, BA0_EGPIOPTR, 
                                   EGPIOPTR_GPPT0 | val2); /* open-drain on output */
        } else {
                /* coaxial */
                snd_cs46xx_pokeBA0(chip, BA0_EGPIODR,  val1 & ~EGPIODR_GPOE0); /* disable */
                snd_cs46xx_pokeBA0(chip, BA0_EGPIOPTR, val2 & ~EGPIOPTR_GPPT0); /* disable */
        }

        /* checking diff from the EGPIO direction register 
           should be enough */
        return (val1 != (int)snd_cs46xx_peekBA0(chip, BA0_EGPIODR));
}


static int snd_cs46xx_spdif_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
        uinfo->count = 1;
        return 0;
}

static int snd_cs46xx_spdif_default_get(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_cs46xx *chip = snd_kcontrol_chip(kcontrol);
        struct dsp_spos_instance * ins = chip->dsp_spos_instance;