bktr_audio.c revision 59250 
1/* $FreeBSD: head/sys/dev/bktr/bktr_audio.c 59250 2000-04-15 07:46:19Z roger $ */
2/*
3 * This is part of the Driver for Video Capture Cards (Frame grabbers)
4 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
5 * chipset.
6 * Copyright Roger Hardiman and Amancio Hasty.
7 *
8 * bktr_audio : This deals with controlling the audio on TV cards,
9 *                controlling the Audio Multiplexer (audio source selector).
10 *                controlling any MSP34xx stereo audio decoders.
11 *                controlling any DPL35xx dolby surroud sound audio decoders.
12 *                initialising TDA98xx audio devices.
13 *
14 */
15
16/*
17 * 1. Redistributions of source code must retain the
18 * Copyright (c) 1997 Amancio Hasty, 1999 Roger Hardiman
19 * All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 *    notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 *    notice, this list of conditions and the following disclaimer in the
28 *    documentation and/or other materials provided with the distribution.
29 * 3. All advertising materials mentioning features or use of this software
30 *    must display the following acknowledgement:
31 *      This product includes software developed by Amancio Hasty and
32 *      Roger Hardiman
33 * 4. The name of the author may not be used to endorse or promote products
34 *    derived from this software without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
37 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
38 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
40 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
41 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
42 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
45 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
46 * POSSIBILITY OF SUCH DAMAGE.
47 */
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/kernel.h>
52#include <sys/vnode.h>
53#ifdef __NetBSD__
54#include <sys/proc.h>
55static int bootverbose = 1;
56#endif
57
58#ifdef __FreeBSD__
59#include <machine/clock.h>		/* for DELAY */
60#include <pci/pcivar.h>
61#endif
62
63#if (__FreeBSD_version >=300000)
64#include <machine/bus_memio.h>		/* for bus space */
65#include <machine/bus.h>
66#include <sys/bus.h>
67#endif
68
69#ifdef __NetBSD__
70#include <dev/ic/ioctl_meteor.h>	/* NetBSD location of .h files */
71#include <dev/ic/ioctl_bt848.h>
72#else
73#include <machine/ioctl_meteor.h>	/* Traditional location of .h files */
74#include <machine/ioctl_bt848.h>        /* extensions to ioctl_meteor.h */
75#endif
76#include <dev/bktr/bktr_reg.h>
77#include <dev/bktr/bktr_core.h>
78#include <dev/bktr/bktr_tuner.h>
79#include <dev/bktr/bktr_card.h>
80#include <dev/bktr/bktr_audio.h>
81
82
83/*
84 * Prototypes for the GV_BCTV specific functions.
85 */
86void    set_bctv_audio( bktr_ptr_t bktr );
87void    bctv_gpio_write( bktr_ptr_t bktr, int port, int val );
88/*int   bctv_gpio_read( bktr_ptr_t bktr, int port );*/ /* Not used */
89
90
91
92/*
93 * init_audio_devices
94 * Reset any MSP34xx or TDA98xx audio devices.
95 */
96void init_audio_devices( bktr_ptr_t bktr ) {
97
98        /* enable stereo if appropriate on TDA audio chip */
99        if ( bktr->card.dbx )
100                init_BTSC( bktr );
101
102        /* reset the MSP34xx stereo audio chip */
103        if ( bktr->card.msp3400c )
104                msp_dpl_reset( bktr, bktr->msp_addr );
105
106        /* reset the DPL35xx dolby audio chip */
107        if ( bktr->card.dpl3518a )
108                msp_dpl_reset( bktr, bktr->dpl_addr );
109
110}
111
112
113/*
114 *
115 */
116#define AUDIOMUX_DISCOVER_NOT
117int
118set_audio( bktr_ptr_t bktr, int cmd )
119{
120	u_long		temp;
121	volatile u_char	idx;
122
123#if defined( AUDIOMUX_DISCOVER )
124	if ( cmd >= 200 )
125		cmd -= 200;
126	else
127#endif /* AUDIOMUX_DISCOVER */
128
129	/* check for existance of audio MUXes */
130	if ( !bktr->card.audiomuxs[ 4 ] )
131		return( -1 );
132
133	switch (cmd) {
134	case AUDIO_TUNER:
135#ifdef BKTR_REVERSEMUTE
136		bktr->audio_mux_select = 3;
137#else
138		bktr->audio_mux_select = 0;
139#endif
140
141		if (bktr->reverse_mute )
142		      bktr->audio_mux_select = 0;
143		else
144		    bktr->audio_mux_select = 3;
145
146		break;
147	case AUDIO_EXTERN:
148		bktr->audio_mux_select = 1;
149		break;
150	case AUDIO_INTERN:
151		bktr->audio_mux_select = 2;
152		break;
153	case AUDIO_MUTE:
154		bktr->audio_mute_state = TRUE;	/* set mute */
155		break;
156	case AUDIO_UNMUTE:
157		bktr->audio_mute_state = FALSE;	/* clear mute */
158		break;
159	default:
160		printf("bktr: audio cmd error %02x\n", cmd);
161		return( -1 );
162	}
163
164
165	/* Most cards have a simple audio multiplexer to select the
166	 * audio source. The I/O_GV card has a more advanced multiplexer
167	 * and requires special handling.
168	 */
169        if ( bktr->bt848_card == CARD_IO_GV ) {
170                set_bctv_audio( bktr );
171                return( 0 );
172	}
173
174	/* Proceed with the simpler audio multiplexer code for the majority
175	 * of Bt848 cards.
176	 */
177
178	/*
179	 * Leave the upper bits of the GPIO port alone in case they control
180	 * something like the dbx or teletext chips.  This doesn't guarantee
181	 * success, but follows the rule of least astonishment.
182	 */
183
184	if ( bktr->audio_mute_state == TRUE ) {
185#ifdef BKTR_REVERSEMUTE
186		idx = 0;
187#else
188		idx = 3;
189#endif
190
191		if (bktr->reverse_mute )
192		  idx  = 3;
193		else
194		  idx  = 0;
195
196	}
197	else
198		idx = bktr->audio_mux_select;
199
200	temp = INL(bktr, BKTR_GPIO_DATA) & ~bktr->card.gpio_mux_bits;
201#if defined( AUDIOMUX_DISCOVER )
202	OUTL(bktr, BKTR_GPIO_DATA, temp | (cmd & 0xff));
203	printf("cmd: %d audio mux %x temp %x \n", cmd,bktr->card.audiomuxs[ idx ], temp );
204#else
205	OUTL(bktr, BKTR_GPIO_DATA, temp | bktr->card.audiomuxs[ idx ]);
206#endif /* AUDIOMUX_DISCOVER */
207
208	return( 0 );
209}
210
211
212/*
213 *
214 */
215void
216temp_mute( bktr_ptr_t bktr, int flag )
217{
218	static int	muteState = FALSE;
219
220	if ( flag == TRUE ) {
221		muteState = bktr->audio_mute_state;
222		set_audio( bktr, AUDIO_MUTE );		/* prevent 'click' */
223	}
224	else {
225		tsleep( BKTR_SLEEP, PZERO, "tuning", hz/8 );
226		if ( muteState == FALSE )
227			set_audio( bktr, AUDIO_UNMUTE );
228	}
229}
230
231/* address of BTSC/SAP decoder chip */
232#define TDA9850_WADDR           0xb6
233#define TDA9850_RADDR           0xb7
234
235
236/* registers in the TDA9850 BTSC/dbx chip */
237#define CON1ADDR                0x04
238#define CON2ADDR                0x05
239#define CON3ADDR                0x06
240#define CON4ADDR                0x07
241#define ALI1ADDR                0x08
242#define ALI2ADDR                0x09
243#define ALI3ADDR                0x0a
244
245/*
246 * initialise the dbx chip
247 * taken from the Linux bttv driver TDA9850 initialisation code
248 */
249void
250init_BTSC( bktr_ptr_t bktr )
251{
252    i2cWrite(bktr, TDA9850_WADDR, CON1ADDR, 0x08); /* noise threshold st */
253    i2cWrite(bktr, TDA9850_WADDR, CON2ADDR, 0x08); /* noise threshold sap */
254    i2cWrite(bktr, TDA9850_WADDR, CON3ADDR, 0x40); /* stereo mode */
255    i2cWrite(bktr, TDA9850_WADDR, CON4ADDR, 0x07); /* 0 dB input gain? */
256    i2cWrite(bktr, TDA9850_WADDR, ALI1ADDR, 0x10); /* wideband alignment? */
257    i2cWrite(bktr, TDA9850_WADDR, ALI2ADDR, 0x10); /* spectral alignment? */
258    i2cWrite(bktr, TDA9850_WADDR, ALI3ADDR, 0x03);
259}
260
261/*
262 * setup the dbx chip
263 * XXX FIXME: alot of work to be done here, this merely unmutes it.
264 */
265int
266set_BTSC( bktr_ptr_t bktr, int control )
267{
268	return( i2cWrite( bktr, TDA9850_WADDR, CON3ADDR, control ) );
269}
270
271/*
272 * CARD_GV_BCTV specific functions.
273 */
274
275#define BCTV_AUDIO_MAIN              0x10    /* main audio program */
276#define BCTV_AUDIO_SUB               0x20    /* sub audio program */
277#define BCTV_AUDIO_BOTH              0x30    /* main(L) + sub(R) program */
278
279#define BCTV_GPIO_REG0          1
280#define BCTV_GPIO_REG1          3
281
282#define BCTV_GR0_AUDIO_MODE     3
283#define BCTV_GR0_AUDIO_MAIN     0       /* main program */
284#define BCTV_GR0_AUDIO_SUB      3       /* sub program */
285#define BCTV_GR0_AUDIO_BOTH     1       /* main(L) + sub(R) */
286#define BCTV_GR0_AUDIO_MUTE     4       /* audio mute */
287#define BCTV_GR0_AUDIO_MONO     8       /* force mono */
288
289void
290set_bctv_audio( bktr_ptr_t bktr )
291{
292        int data;
293
294        switch (bktr->audio_mux_select) {
295        case 1:         /* external */
296        case 2:         /* internal */
297                bctv_gpio_write(bktr, BCTV_GPIO_REG1, 0);
298                break;
299        default:        /* tuner */
300                bctv_gpio_write(bktr, BCTV_GPIO_REG1, 1);
301                break;
302        }
303/*      switch (bktr->audio_sap_select) { */
304        switch (BCTV_AUDIO_BOTH) {
305        case BCTV_AUDIO_SUB:
306                data = BCTV_GR0_AUDIO_SUB;
307                break;
308        case BCTV_AUDIO_BOTH:
309                data = BCTV_GR0_AUDIO_BOTH;
310                break;
311        case BCTV_AUDIO_MAIN:
312        default:
313                data = BCTV_GR0_AUDIO_MAIN;
314                break;
315        }
316        if (bktr->audio_mute_state == TRUE)
317                data |= BCTV_GR0_AUDIO_MUTE;
318
319        bctv_gpio_write(bktr, BCTV_GPIO_REG0, data);
320
321        return;
322}
323
324/* gpio_data bit assignment */
325#define BCTV_GPIO_ADDR_MASK     0x000300
326#define BCTV_GPIO_WE            0x000400
327#define BCTV_GPIO_OE            0x000800
328#define BCTV_GPIO_VAL_MASK      0x00f000
329
330#define BCTV_GPIO_PORT_MASK     3
331#define BCTV_GPIO_ADDR_SHIFT    8
332#define BCTV_GPIO_VAL_SHIFT     12
333
334/* gpio_out_en value for read/write */
335#define BCTV_GPIO_OUT_RMASK     0x000f00
336#define BCTV_GPIO_OUT_WMASK     0x00ff00
337
338#define BCTV_BITS       100
339
340void
341bctv_gpio_write( bktr_ptr_t bktr, int port, int val )
342{
343        u_long data, outbits;
344
345        port &= BCTV_GPIO_PORT_MASK;
346        switch (port) {
347        case 1:
348        case 3:
349                data = ((val << BCTV_GPIO_VAL_SHIFT) & BCTV_GPIO_VAL_MASK) |
350                       ((port << BCTV_GPIO_ADDR_SHIFT) & BCTV_GPIO_ADDR_MASK) |
351                       BCTV_GPIO_WE | BCTV_GPIO_OE;
352                outbits = BCTV_GPIO_OUT_WMASK;
353                break;
354        default:
355                return;
356        }
357        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
358        OUTL(bktr, BKTR_GPIO_DATA, data);
359        OUTL(bktr, BKTR_GPIO_OUT_EN, outbits);
360        DELAY(BCTV_BITS);
361        OUTL(bktr, BKTR_GPIO_DATA, data & ~BCTV_GPIO_WE);
362        DELAY(BCTV_BITS);
363        OUTL(bktr, BKTR_GPIO_DATA, data);
364        DELAY(BCTV_BITS);
365        OUTL(bktr, BKTR_GPIO_DATA, ~0);
366        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
367}
368
369/* Not yet used
370int
371bctv_gpio_read( bktr_ptr_t bktr, int port )
372{
373        u_long data, outbits, ret;
374
375        port &= BCTV_GPIO_PORT_MASK;
376        switch (port) {
377        case 1:
378        case 3:
379                data = ((port << BCTV_GPIO_ADDR_SHIFT) & BCTV_GPIO_ADDR_MASK) |
380                       BCTV_GPIO_WE | BCTV_GPIO_OE;
381                outbits = BCTV_GPIO_OUT_RMASK;
382                break;
383        default:
384                return( -1 );
385        }
386        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
387        OUTL(bktr, BKTR_GPIO_DATA, data);
388        OUTL(bktr, BKTR_GPIO_OUT_EN, outbits);
389        DELAY(BCTV_BITS);
390        OUTL(bktr, BKTR_GPIO_DATA, data & ~BCTV_GPIO_OE);
391        DELAY(BCTV_BITS);
392        ret = INL(bktr, BKTR_GPIO_DATA);
393        DELAY(BCTV_BITS);
394        OUTL(bktr, BKTR_GPIO_DATA, data);
395        DELAY(BCTV_BITS);
396        OUTL(bktr, BKTR_GPIO_DATA, ~0);
397        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
398        return( (ret & BCTV_GPIO_VAL_MASK) >> BCTV_GPIO_VAL_SHIFT );
399}
400*/
401
402/*
403 * setup the MSP34xx Stereo Audio Chip
404 * This uses the Auto Configuration Option on MSP3410D and MSP3415D chips
405 * and DBX mode selection for MSP3430G chips.
406 * For MSP3400C support, the full programming sequence is required and is
407 * not yet supported.
408 */
409
410/* Read the MSP version string */
411void msp_read_id( bktr_ptr_t bktr ){
412    int rev1=0, rev2=0;
413    rev1 = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x001e);
414    rev2 = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x001f);
415
416    sprintf(bktr->msp_version_string, "34%02d%c-%c%d",
417      (rev2>>8)&0xff, (rev1&0xff)+'@', ((rev1>>8)&0xff)+'@', rev2&0x1f);
418
419}
420
421
422/* Configure the MSP chip to Auto-detect the audio format.
423 * For the MSP3430G, we use fast autodetect mode
424 * For the MSP3410/3415 there are two schemes for this
425 *  a) Fast autodetection - the chip is put into autodetect mode, and the function
426 *     returns immediatly. This works in most cases and is the Default Mode.
427 *  b) Slow mode. The function sets the MSP3410/3415 chip, then waits for feedback from
428 *     the chip and re-programs it if needed.
429 */
430void msp_autodetect( bktr_ptr_t bktr ) {
431  int auto_detect, loops;
432  int stereo;
433
434  /* MSP3430G - countries with mono and DBX stereo */
435  if (strncmp("3430G", bktr->msp_version_string, 5) == 0){
436
437    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0030,0x2003);/* Enable Auto format detection */
438    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0020);/* Standard Select Reg. = BTSC-Stereo*/
439    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000E,0x2403);/* darned if I know */
440    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0320);/* Source select = (St or A) */
441					                     /* & Ch. Matrix = St */
442    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
443  }
444
445
446  /* MSP3410/MSP3415 - countries with mono, stereo using 2 FM channels and NICAM */
447  /* FAST sound scheme */
448  if ( (strncmp("3430G", bktr->msp_version_string, 5) != 0)
449    && (bktr->slow_msp_audio == 0) ){
450    if(bootverbose)printf("inside fast MSP autodetect code\n");
451    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
452    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0001);/* Enable Auto format detection */
453    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0021,0x0001);/* Auto selection of NICAM/MONO mode */
454  }
455
456
457  /* MSP3410/MSP3415 - European Countries where the fast MSP3410/3415 programming fails */
458  /* SLOW sound scheme */
459  if ( (strncmp("3430G", bktr->msp_version_string, 5) != 0)
460    && (bktr->slow_msp_audio == 1) ){
461    if (bootverbose)printf("inside slow MSP autodetect code\n");
462    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
463    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0001);/* Enable Auto format detection */
464
465    /* wait for 0.5s max for terrestrial sound autodetection */
466    loops = 10;
467    do {
468      DELAY(100000);
469      auto_detect = msp_dpl_read(bktr, bktr->msp_addr, 0x10, 0x007e);
470      loops++;
471    } while (auto_detect > 0xff && loops < 50);
472    if (bootverbose)printf ("Result of autodetect after %dms: %d\n", loops*10, auto_detect);
473
474    /* Now set the audio baseband processing */
475    switch (auto_detect) {
476    case 0:                    /* no TV sound standard detected */
477      break;
478    case 2:                    /* M Dual FM */
479      break;
480    case 3:                    /* B/G Dual FM; German stereo */
481      /* Read the stereo detection value from DSP reg 0x0018 */
482      DELAY(20000);
483      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
484      if (bootverbose)printf ("Stereo reg 0x18 a: %d\n", stereo);
485      DELAY(20000);
486      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
487      if (bootverbose)printf ("Stereo reg 0x18 b: %d\n", stereo);
488      DELAY(20000);
489      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
490      if (bootverbose)printf ("Stereo reg 0x18 c: %d\n", stereo);
491      if (stereo > 0x0100 && stereo < 0x8000) { /* Seems to be stereo */
492        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0020);/* Loudspeaker set stereo*/
493        /*
494          set spatial effect strength to 50% enlargement
495          set spatial effect mode b, stereo basewidth enlargment only
496        */
497        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x3f28);
498      } else if (stereo > 0x8000) {    /* bilingual mode */
499        if (bootverbose) printf ("Bilingual mode detected\n");
500        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0000);/* Loudspeaker */
501        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x0000);/* all spatial effects off */
502       } else {                 /* must be mono */
503        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0030);/* Loudspeaker */
504        /*
505          set spatial effect strength to 50% enlargement
506          set spatial effect mode a, stereo basewidth enlargment
507          and pseudo stereo effect with automatic high-pass filter
508        */
509        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x3f08);
510      }
511#if 0
512       /* The reset value for Channel matrix mode is FM/AM and SOUNDA/LEFT */
513       /* We would like STEREO instead val: 0x0020 */
514       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0020);/* Loudspeaker */
515       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0009,0x0020);/* Headphone */
516       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000a,0x0020);/* SCART1 */
517       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0041,0x0020);/* SCART2 */
518       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000b,0x0020);/* I2S */
519       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000c,0x0020);/* Quasi-Peak Detector Source */
520       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000e,0x0001);
521#endif
522      break;
523    case 8:                    /* B/G FM NICAM */
524       msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0021,0x0001);/* Auto selection of NICAM/MONO mode */
525       break;
526     case 9:                    /* L_AM NICAM or D/K*/
527     case 10:                   /* i-FM NICAM */
528       break;
529     default:
530       if (bootverbose) printf ("Unkown autodetection result value: %d\n", auto_detect);
531     }
532
533  }
534
535
536  /* uncomment the following line to enable the MSP34xx 1Khz Tone Generator */
537  /* turn your speaker volume down low before trying this */
538  /* msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0014, 0x7f40); */
539}
540
541/* Read the DPL version string */
542void dpl_read_id( bktr_ptr_t bktr ){
543    int rev1=0, rev2=0;
544    rev1 = msp_dpl_read(bktr, bktr->dpl_addr, 0x12, 0x001e);
545    rev2 = msp_dpl_read(bktr, bktr->dpl_addr, 0x12, 0x001f);
546
547    sprintf(bktr->dpl_version_string, "34%02d%c-%c%d",
548      ((rev2>>8)&0xff)-1, (rev1&0xff)+'@', ((rev1>>8)&0xff)+'@', rev2&0x1f);
549}
550
551/* Configure the DPL chip to Auto-detect the audio format */
552void dpl_autodetect( bktr_ptr_t bktr ) {
553
554    /* The following are empiric values tried from the DPL35xx data sheet */
555    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x000c,0x0320);	/* quasi peak detector source dolby
556								lr 0x03xx; quasi peak detector matrix
557								stereo 0xXX20 */
558    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0040,0x0060);	/* Surround decoder mode;
559								ADAPTIVE/3D-PANORAMA, that means two
560								speakers and no center speaker, all
561								channels L/R/C/S mixed to L and R */
562    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0041,0x0620);	/* surround source matrix;I2S2/STEREO*/
563    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0042,0x1F00);	/* surround delay 31ms max */
564    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0043,0x0000);	/* automatic surround input balance */
565    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0044,0x4000);	/* surround spatial effect 50%
566								recommended*/
567    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0045,0x5400);	/* surround panorama effect 66%
568								recommended with PANORAMA mode
569								in 0x0040 set to panorama */
570}
571
572