/*      $OpenBSD: bktr_audio.c,v 1.15 2024/09/04 07:54:52 mglocker Exp $        */
/* $FreeBSD: src/sys/dev/bktr/bktr_audio.c,v 1.8 2000/10/31 13:09:56 roger Exp $ */
/*
 * This is part of the Driver for Video Capture Cards (Frame grabbers)
 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
 * chipset.
 * Copyright Roger Hardiman and Amancio Hasty.
 *
 * bktr_audio : This deals with controlling the audio on TV cards,
 *                controlling the Audio Multiplexer (audio source selector).
 *                controlling any MSP34xx stereo audio decoders.
 *                controlling any DPL35xx dolby surround sound audio decoders.    
 *                initialising TDA98xx audio devices.
 *
 */

/*
 * 1. Redistributions of source code must retain the
 * Copyright (c) 1997 Amancio Hasty, 1999 Roger Hardiman
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Amancio Hasty and
 *      Roger Hardiman
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/vnode.h>

#include <dev/ic/bt8xx.h>       /* OpenBSD location of .h files */
#include <dev/pci/bktr/bktr_reg.h>
#include <dev/pci/bktr/bktr_core.h>
#include <dev/pci/bktr/bktr_card.h>
#include <dev/pci/bktr/bktr_audio.h>

/*
 * Prototypes for the GV_BCTV specific functions.
 */
void    set_bctv_audio( bktr_ptr_t bktr );
void    bctv_gpio_write( bktr_ptr_t bktr, int port, int val );
/*int   bctv_gpio_read( bktr_ptr_t bktr, int port );*/ /* Not used */



/*
 * init_audio_devices
 * Reset any MSP34xx or TDA98xx audio devices.
 */
void init_audio_devices( bktr_ptr_t bktr ) {

        /* enable stereo if appropriate on TDA audio chip */
        if ( bktr->card.dbx )
                init_BTSC( bktr );
 
        /* reset the MSP34xx stereo audio chip */
        if ( bktr->card.msp3400c )
                msp_dpl_reset( bktr, bktr->msp_addr );

        /* reset the DPL35xx dolby audio chip */
        if ( bktr->card.dpl3518a )
                msp_dpl_reset( bktr, bktr->dpl_addr );

}


/*
 * 
 */
#define AUDIOMUX_DISCOVER_NOT
int
set_audio( bktr_ptr_t bktr, int cmd )
{
        u_int           temp;
        volatile u_char idx;

#if defined( AUDIOMUX_DISCOVER )
        if ( cmd >= 200 )
                cmd -= 200;
        else
#endif /* AUDIOMUX_DISCOVER */

        /* check for existence of audio MUXes */
        if ( !bktr->card.audiomuxs[ 4 ] )
                return( -1 );

        switch (cmd) {
        case AUDIO_TUNER:
                if (bktr->reverse_mute ) 
                    bktr->audio_mux_select = 0;
                else    
                    bktr->audio_mux_select = 3;

                break;
        case AUDIO_EXTERN:
                bktr->audio_mux_select = 1;
                break;
        case AUDIO_INTERN:
                bktr->audio_mux_select = 2;
                break;
        case AUDIO_MUTE:
                bktr->audio_mute_state = TRUE;  /* set mute */
                break;
        case AUDIO_UNMUTE:
                bktr->audio_mute_state = FALSE; /* clear mute */
                break;
        default:
                printf("%s: audio cmd error %02x\n", bktr_name(bktr),
                       cmd);
                return( -1 );
        }


        /* Most cards have a simple audio multiplexer to select the
         * audio source. The I/O_GV card has a more advanced multiplexer
         * and requires special handling.
         */
        if ( bktr->bt848_card == CARD_IO_GV ) {
                set_bctv_audio( bktr );
                return( 0 );
        }

        /* Proceed with the simpler audio multiplexer code for the majority
         * of Bt848 cards.
         */

        /*
         * Leave the upper bits of the GPIO port alone in case they control
         * something like the dbx or teletext chips.  This doesn't guarantee
         * success, but follows the rule of least astonishment.
         */

        if ( bktr->audio_mute_state == TRUE ) {
                if (bktr->reverse_mute )
                  idx  = 3;
                else    
                  idx  = 0;
        }
        else
                idx = bktr->audio_mux_select;


        temp = INL(bktr, BKTR_GPIO_DATA) & ~bktr->card.gpio_mux_bits;
#if defined( AUDIOMUX_DISCOVER )
        OUTL(bktr, BKTR_GPIO_DATA, temp | (cmd & 0xff));
        printf("%s: cmd: %d audio mux %x temp %x \n", bktr_name(bktr),
                cmd, bktr->card.audiomuxs[ idx ], temp );
#else
        OUTL(bktr, BKTR_GPIO_DATA, temp | bktr->card.audiomuxs[ idx ]);
#endif /* AUDIOMUX_DISCOVER */



        /* Some new Hauppauge cards do not have an audio mux */
        /* Instead we use the MSP34xx chip to select TV audio, Line-In */
        /* FM Radio and Mute */
        /* Examples of this are the Hauppauge 44xxx MSP34xx models */
        /* It is ok to drive both the mux and the MSP34xx chip. */
        /* If there is no mux, the MSP does the switching of the audio source */
        /* If there is a mux, it does the switching of the audio source */

        if ((bktr->card.msp3400c) && (bktr->audio_mux_present == 0)) {

          if (bktr->audio_mute_state == TRUE ) {
                 msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000, 0x0000); /* volume to MUTE */
          } else {
                 if(bktr->audio_mux_select == 0) { /* TV Tuner */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000, 0x7300); /* 0 db volume */
                    if (bktr->msp_source_selected != 0) msp_autodetect(bktr);  /* setup TV audio mode */
                    bktr->msp_source_selected = 0;
                 }
                 if(bktr->audio_mux_select == 1) { /* Line In */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000, 0x7300); /* 0 db volume */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000d, 0x1900); /* scart prescale */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008, 0x0220); /* SCART | STEREO */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0013, 0x0000); /* DSP In = SC1_IN_L/R */
                    bktr->msp_source_selected = 1;
                 }

                 if(bktr->audio_mux_select == 2) { /* FM Radio */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000, 0x7300); /* 0 db volume */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000d, 0x1900); /* scart prescale */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008, 0x0220); /* SCART | STEREO */
                    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0013, 0x0200); /* DSP In = SC2_IN_L/R */
                    bktr->msp_source_selected = 2;
                 }
          }
        }


        return( 0 );
}


/*
 * 
 */
void
temp_mute( bktr_ptr_t bktr, int flag )
{
        static int      muteState = FALSE;

        if ( flag == TRUE ) {
                muteState = bktr->audio_mute_state;
                set_audio( bktr, AUDIO_MUTE );          /* prevent 'click' */
        }
        else {
                tsleep_nsec( BKTR_SLEEP, PZERO, "tuning", MSEC_TO_NSEC(125) );
                if ( muteState == FALSE )
                        set_audio( bktr, AUDIO_UNMUTE );
        }
}

/* address of BTSC/SAP decoder chip */
#define TDA9850_WADDR           0xb6
#define TDA9850_RADDR           0xb7


/* registers in the TDA9850 BTSC/dbx chip */
#define CON1ADDR                0x04
#define CON2ADDR                0x05
#define CON3ADDR                0x06 
#define CON4ADDR                0x07
#define ALI1ADDR                0x08 
#define ALI2ADDR                0x09
#define ALI3ADDR                0x0a

/*
 * initialise the dbx chip
 * taken from the Linux bttv driver TDA9850 initialisation code
 */
void 
init_BTSC( bktr_ptr_t bktr )
{
    i2cWrite(bktr, TDA9850_WADDR, CON1ADDR, 0x08); /* noise threshold st */
    i2cWrite(bktr, TDA9850_WADDR, CON2ADDR, 0x08); /* noise threshold sap */
    i2cWrite(bktr, TDA9850_WADDR, CON3ADDR, 0x40); /* stereo mode */
    i2cWrite(bktr, TDA9850_WADDR, CON4ADDR, 0x07); /* 0 dB input gain? */
    i2cWrite(bktr, TDA9850_WADDR, ALI1ADDR, 0x10); /* wideband alignment? */
    i2cWrite(bktr, TDA9850_WADDR, ALI2ADDR, 0x10); /* spectral alignment? */
    i2cWrite(bktr, TDA9850_WADDR, ALI3ADDR, 0x03);
}

/*
 * setup the dbx chip
 * XXX FIXME: a lot of work to be done here, this merely unmutes it.
 */
int
set_BTSC( bktr_ptr_t bktr, int control )
{
        return( i2cWrite( bktr, TDA9850_WADDR, CON3ADDR, control ) );
}

/*
 * CARD_GV_BCTV specific functions.
 */

#define BCTV_AUDIO_MAIN              0x10    /* main audio program */
#define BCTV_AUDIO_SUB               0x20    /* sub audio program */
#define BCTV_AUDIO_BOTH              0x30    /* main(L) + sub(R) program */

#define BCTV_GPIO_REG0          1
#define BCTV_GPIO_REG1          3

#define BCTV_GR0_AUDIO_MODE     3
#define BCTV_GR0_AUDIO_MAIN     0       /* main program */
#define BCTV_GR0_AUDIO_SUB      3       /* sub program */
#define BCTV_GR0_AUDIO_BOTH     1       /* main(L) + sub(R) */
#define BCTV_GR0_AUDIO_MUTE     4       /* audio mute */
#define BCTV_GR0_AUDIO_MONO     8       /* force mono */

void
set_bctv_audio( bktr_ptr_t bktr )
{
        int data;

        switch (bktr->audio_mux_select) {
        case 1:         /* external */
        case 2:         /* internal */
                bctv_gpio_write(bktr, BCTV_GPIO_REG1, 0);
                break;
        default:        /* tuner */
                bctv_gpio_write(bktr, BCTV_GPIO_REG1, 1);
                break;
        }
/*      switch (bktr->audio_sap_select) { */
        switch (BCTV_AUDIO_BOTH) {
        case BCTV_AUDIO_SUB:
                data = BCTV_GR0_AUDIO_SUB;
                break;
        case BCTV_AUDIO_BOTH:
                data = BCTV_GR0_AUDIO_BOTH;
                break;
        case BCTV_AUDIO_MAIN:
        default:
                data = BCTV_GR0_AUDIO_MAIN;
                break;
        }
        if (bktr->audio_mute_state == TRUE)
                data |= BCTV_GR0_AUDIO_MUTE;

        bctv_gpio_write(bktr, BCTV_GPIO_REG0, data);

        return;
}

/* gpio_data bit assignment */
#define BCTV_GPIO_ADDR_MASK     0x000300
#define BCTV_GPIO_WE            0x000400
#define BCTV_GPIO_OE            0x000800
#define BCTV_GPIO_VAL_MASK      0x00f000

#define BCTV_GPIO_PORT_MASK     3
#define BCTV_GPIO_ADDR_SHIFT    8
#define BCTV_GPIO_VAL_SHIFT     12

/* gpio_out_en value for read/write */
#define BCTV_GPIO_OUT_RMASK     0x000f00
#define BCTV_GPIO_OUT_WMASK     0x00ff00

#define BCTV_BITS       100

void
bctv_gpio_write( bktr_ptr_t bktr, int port, int val )
{
        u_int data, outbits;

        port &= BCTV_GPIO_PORT_MASK;
        switch (port) {
        case 1:
        case 3:
                data = ((val << BCTV_GPIO_VAL_SHIFT) & BCTV_GPIO_VAL_MASK) |
                       ((port << BCTV_GPIO_ADDR_SHIFT) & BCTV_GPIO_ADDR_MASK) |
                       BCTV_GPIO_WE | BCTV_GPIO_OE;
                outbits = BCTV_GPIO_OUT_WMASK;
                break;
        default:
                return;
        }
        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
        OUTL(bktr, BKTR_GPIO_DATA, data);
        OUTL(bktr, BKTR_GPIO_OUT_EN, outbits);
        DELAY(BCTV_BITS);
        OUTL(bktr, BKTR_GPIO_DATA, data & ~BCTV_GPIO_WE);
        DELAY(BCTV_BITS);
        OUTL(bktr, BKTR_GPIO_DATA, data);
        DELAY(BCTV_BITS);
        OUTL(bktr, BKTR_GPIO_DATA, ~0);
        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
}

/* Not yet used
int
bctv_gpio_read( bktr_ptr_t bktr, int port )
{
        u_int data, outbits, ret;

        port &= BCTV_GPIO_PORT_MASK;
        switch (port) {
        case 1:
        case 3:
                data = ((port << BCTV_GPIO_ADDR_SHIFT) & BCTV_GPIO_ADDR_MASK) |
                       BCTV_GPIO_WE | BCTV_GPIO_OE;
                outbits = BCTV_GPIO_OUT_RMASK;
                break;
        default:
                return( -1 );
        }
        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
        OUTL(bktr, BKTR_GPIO_DATA, data);
        OUTL(bktr, BKTR_GPIO_OUT_EN, outbits);
        DELAY(BCTV_BITS);
        OUTL(bktr, BKTR_GPIO_DATA, data & ~BCTV_GPIO_OE);
        DELAY(BCTV_BITS);
        ret = INL(bktr, BKTR_GPIO_DATA);
        DELAY(BCTV_BITS);
        OUTL(bktr, BKTR_GPIO_DATA, data);
        DELAY(BCTV_BITS);
        OUTL(bktr, BKTR_GPIO_DATA, ~0);
        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
        return( (ret & BCTV_GPIO_VAL_MASK) >> BCTV_GPIO_VAL_SHIFT );
}
*/

/*
 * setup the MSP34xx Stereo Audio Chip
 * This uses the Auto Configuration Option on MSP3410D and MSP3415D chips
 * and DBX mode selection for MSP3430G chips.
 * For MSP3400C support, the full programming sequence is required and is
 * not yet supported.
 */

/* Read the MSP version string */
void msp_read_id( bktr_ptr_t bktr ){
    int rev1=0, rev2=0;
    rev1 = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x001e);
    rev2 = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x001f);

    snprintf(bktr->msp_version_string, sizeof bktr->msp_version_string,
      "34%02d%c-%c%d", (rev2>>8)&0xff, (rev1&0xff)+'@', ((rev1>>8)&0xff)+'@',
      rev2&0x1f);

}


/* Configure the MSP chip to Auto-detect the audio format.
 * For the MSP3430G, we use fast autodetect mode
 * For the MSP3410/3415 there are two schemes for this
 *  a) Fast autodetection - the chip is put into autodetect mode, and the function
 *     returns immediately. This works in most cases and is the Default Mode.
 *  b) Slow mode. The function sets the MSP3410/3415 chip, then waits for feedback from 
 *     the chip and re-programs it if needed.
 */
void msp_autodetect( bktr_ptr_t bktr ) {
  int auto_detect, loops;
  int stereo;

  /* MSP3430G - countries with mono and DBX stereo */
  if (strncmp("3430G", bktr->msp_version_string, 5) == 0 ||
      strncmp("3435G", bktr->msp_version_string, 5) == 0) {

    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0030,0x2003);/* Enable Auto format detection */
    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0020);/* Standard Select Reg. = BTSC-Stereo*/
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000E,0x2403);/* darned if I know */
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0320);/* Source select = (St or A) */
                                                             /* & Ch. Matrix = St */
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
  }


  /* MSP3415D SPECIAL CASE Use the Tuner's Mono audio output for the MSP */
  /* (for Hauppauge 44xxx card with Tuner Type 0x2a) */
  else if (  ( (strncmp("3415D", bktr->msp_version_string, 5) == 0)
               &&(bktr->msp_use_mono_source == 1)
              )
           || (bktr->slow_msp_audio == 2) ){
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000, 0x7300); /* 0 db volume */
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000d, 0x1900); /* scart prescale */
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008, 0x0220); /* SCART | STEREO */
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0013, 0x0100); /* DSP In = MONO IN */
  }


  /* MSP3410/MSP3415 - countries with mono, stereo using 2 FM channels and NICAM */
  /* FAST sound scheme */
  else if (bktr->slow_msp_audio == 0) {
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0000);/* Spkr Source = default(FM/AM) */
    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0001);/* Enable Auto format detection */
    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0021,0x0001);/* Auto selection of NICAM/MONO mode */
  }


  /* MSP3410/MSP3415 - European Countries where the fast MSP3410/3415 programming fails */
  /* SLOW sound scheme */
  else if ( bktr->slow_msp_audio == 1) {
    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0001);/* Enable Auto format detection */
    
    /* wait for 0.5s max for terrestrial sound autodetection */
    loops = 10;
    do {
      DELAY(100000);
      auto_detect = msp_dpl_read(bktr, bktr->msp_addr, 0x10, 0x007e);
      loops++;
    } while (auto_detect > 0xff && loops < 50);
    if (bootverbose)printf ("%s: Result of autodetect after %dms: %d\n",
                            bktr_name(bktr), loops*10, auto_detect);

    /* Now set the audio baseband processing */
    switch (auto_detect) {
    case 0:                    /* no TV sound standard detected */
      break;
    case 2:                    /* M Dual FM */
      break;
    case 3:                    /* B/G Dual FM; German stereo */
      /* Read the stereo detection value from DSP reg 0x0018 */
      DELAY(20000);
      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
      if (bootverbose)printf ("%s: Stereo reg 0x18 a: %d\n",
                              bktr_name(bktr), stereo);
      DELAY(20000);
      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
      if (bootverbose)printf ("%s: Stereo reg 0x18 b: %d\n",
                              bktr_name(bktr), stereo); 
      DELAY(20000); 
      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
      if (bootverbose)printf ("%s: Stereo reg 0x18 c: %d\n",
                              bktr_name(bktr), stereo);
      if (stereo > 0x0100 && stereo < 0x8000) { /* Seems to be stereo */
        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0020);/* Loudspeaker set stereo*/
        /*
          set spatial effect strength to 50% enlargement
          set spatial effect mode b, stereo basewidth enlargement only
        */
        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x3f28);
      } else if (stereo > 0x8000) {    /* bilingual mode */
        if (bootverbose) printf ("%s: Bilingual mode detected\n",
                                 bktr_name(bktr));
        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0000);/* Loudspeaker */
        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x0000);/* all spatial effects off */
       } else {                 /* must be mono */
        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0030);/* Loudspeaker */
        /*
          set spatial effect strength to 50% enlargement
          set spatial effect mode a, stereo basewidth enlargement
          and pseudo stereo effect with automatic high-pass filter
        */
        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x3f08);
      }
#if 0
       /* The reset value for Channel matrix mode is FM/AM and SOUNDA/LEFT */
       /* We would like STEREO instead val: 0x0020 */
       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0020);/* Loudspeaker */
       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0009,0x0020);/* Headphone */
       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000a,0x0020);/* SCART1 */
       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0041,0x0020);/* SCART2 */
       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000b,0x0020);/* I2S */
       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000c,0x0020);/* Quasi-Peak Detector Source */
       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000e,0x0001);
#endif
      break;
    case 8:                    /* B/G FM NICAM */
       msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0021,0x0001);/* Auto selection of NICAM/MONO mode */
       break;
     case 9:                    /* L_AM NICAM or D/K*/
     case 10:                   /* i-FM NICAM */
       break;
     default:
       if (bootverbose) printf ("%s: Unknown autodetection result value: %d\n",
                                bktr_name(bktr), auto_detect); 
     }

  }


  /* uncomment the following line to enable the MSP34xx 1KHz Tone Generator */
  /* turn your speaker volume down low before trying this */
  /* msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0014, 0x7f40); */
}

/* Read the DPL version string */
void dpl_read_id( bktr_ptr_t bktr ){
    int rev1=0, rev2=0;
    rev1 = msp_dpl_read(bktr, bktr->dpl_addr, 0x12, 0x001e);
    rev2 = msp_dpl_read(bktr, bktr->dpl_addr, 0x12, 0x001f);

    snprintf(bktr->dpl_version_string, sizeof bktr->dpl_version_string,
      "34%02d%c-%c%d", ((rev2>>8)&0xff)-1, (rev1&0xff)+'@',
      ((rev1>>8)&0xff)+'@', rev2&0x1f);
}

/* Configure the DPL chip to Auto-detect the audio format */
void dpl_autodetect( bktr_ptr_t bktr ) {

    /* The following are empiric values tried from the DPL35xx data sheet */
    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x000c,0x0320);   /* quasi peak detector source dolby
                                                                lr 0x03xx; quasi peak detector matrix
                                                                stereo 0xXX20 */
    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0040,0x0060);   /* Surround decoder mode;
                                                                ADAPTIVE/3D-PANORAMA, that means two
                                                                speakers and no center speaker, all
                                                                channels L/R/C/S mixed to L and R */
    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0041,0x0620);   /* surround source matrix;I2S2/STEREO*/
    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0042,0x1F00);   /* surround delay 31ms max */
    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0043,0x0000);   /* automatic surround input balance */
    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0044,0x4000);   /* surround spatial effect 50%
                                                                recommended*/
    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0045,0x5400);   /* surround panorama effect 66%
                                                                recommended with PANORAMA mode
                                                                in 0x0040 set to panorama */
}