bktr_audio.c revision 67306 
1/* $FreeBSD: head/sys/dev/bktr/bktr_audio.c 67306 2000-10-19 07:33:28Z 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
54#ifdef __FreeBSD__
55
56#if (__FreeBSD_version < 500000)
57#include <machine/clock.h>              /* for DELAY */
58#endif
59
60#include <pci/pcivar.h>
61
62#if (__FreeBSD_version >=300000)
63#include <machine/bus_memio.h>		/* for bus space */
64#include <machine/bus.h>
65#include <sys/bus.h>
66#endif
67#endif
68
69#ifdef __NetBSD__
70#include <sys/proc.h>
71#include <dev/ic/bt8xx.h>	/* NetBSD location of .h files */
72#include <dev/pci/bktr/bktr_reg.h>
73#include <dev/pci/bktr/bktr_core.h>
74#include <dev/pci/bktr/bktr_tuner.h>
75#include <dev/pci/bktr/bktr_card.h>
76#include <dev/pci/bktr/bktr_audio.h>
77#else
78#include <machine/ioctl_meteor.h>	/* Traditional location of .h files */
79#include <machine/ioctl_bt848.h>        /* extensions to ioctl_meteor.h */
80#include <dev/bktr/bktr_reg.h>
81#include <dev/bktr/bktr_core.h>
82#include <dev/bktr/bktr_tuner.h>
83#include <dev/bktr/bktr_card.h>
84#include <dev/bktr/bktr_audio.h>
85#endif
86
87/*
88 * Prototypes for the GV_BCTV specific functions.
89 */
90void    set_bctv_audio( bktr_ptr_t bktr );
91void    bctv_gpio_write( bktr_ptr_t bktr, int port, int val );
92/*int   bctv_gpio_read( bktr_ptr_t bktr, int port );*/ /* Not used */
93
94
95
96/*
97 * init_audio_devices
98 * Reset any MSP34xx or TDA98xx audio devices.
99 */
100void init_audio_devices( bktr_ptr_t bktr ) {
101
102        /* enable stereo if appropriate on TDA audio chip */
103        if ( bktr->card.dbx )
104                init_BTSC( bktr );
105
106        /* reset the MSP34xx stereo audio chip */
107        if ( bktr->card.msp3400c )
108                msp_dpl_reset( bktr, bktr->msp_addr );
109
110        /* reset the DPL35xx dolby audio chip */
111        if ( bktr->card.dpl3518a )
112                msp_dpl_reset( bktr, bktr->dpl_addr );
113
114}
115
116
117/*
118 *
119 */
120#define AUDIOMUX_DISCOVER_NOT
121int
122set_audio( bktr_ptr_t bktr, int cmd )
123{
124	u_long		temp;
125	volatile u_char	idx;
126
127#if defined( AUDIOMUX_DISCOVER )
128	if ( cmd >= 200 )
129		cmd -= 200;
130	else
131#endif /* AUDIOMUX_DISCOVER */
132
133	/* check for existance of audio MUXes */
134	if ( !bktr->card.audiomuxs[ 4 ] )
135		return( -1 );
136
137	switch (cmd) {
138	case AUDIO_TUNER:
139#ifdef BKTR_REVERSEMUTE
140		bktr->audio_mux_select = 3;
141#else
142		bktr->audio_mux_select = 0;
143#endif
144
145		if (bktr->reverse_mute )
146		      bktr->audio_mux_select = 0;
147		else
148		    bktr->audio_mux_select = 3;
149
150		break;
151	case AUDIO_EXTERN:
152		bktr->audio_mux_select = 1;
153		break;
154	case AUDIO_INTERN:
155		bktr->audio_mux_select = 2;
156		break;
157	case AUDIO_MUTE:
158		bktr->audio_mute_state = TRUE;	/* set mute */
159		break;
160	case AUDIO_UNMUTE:
161		bktr->audio_mute_state = FALSE;	/* clear mute */
162		break;
163	default:
164		printf("%s: audio cmd error %02x\n", bktr_name(bktr),
165		       cmd);
166		return( -1 );
167	}
168
169
170	/* Most cards have a simple audio multiplexer to select the
171	 * audio source. The I/O_GV card has a more advanced multiplexer
172	 * and requires special handling.
173	 */
174        if ( bktr->bt848_card == CARD_IO_GV ) {
175                set_bctv_audio( bktr );
176                return( 0 );
177	}
178
179	/* Proceed with the simpler audio multiplexer code for the majority
180	 * of Bt848 cards.
181	 */
182
183	/*
184	 * Leave the upper bits of the GPIO port alone in case they control
185	 * something like the dbx or teletext chips.  This doesn't guarantee
186	 * success, but follows the rule of least astonishment.
187	 */
188
189	if ( bktr->audio_mute_state == TRUE ) {
190#ifdef BKTR_REVERSEMUTE
191		idx = 0;
192#else
193		idx = 3;
194#endif
195
196		if (bktr->reverse_mute )
197		  idx  = 3;
198		else
199		  idx  = 0;
200
201	}
202	else
203		idx = bktr->audio_mux_select;
204
205	temp = INL(bktr, BKTR_GPIO_DATA) & ~bktr->card.gpio_mux_bits;
206#if defined( AUDIOMUX_DISCOVER )
207	OUTL(bktr, BKTR_GPIO_DATA, temp | (cmd & 0xff));
208	printf("%s: cmd: %d audio mux %x temp %x \n", bktr_name(bktr),
209	       cmd, bktr->card.audiomuxs[ idx ], temp );
210#else
211	OUTL(bktr, BKTR_GPIO_DATA, temp | bktr->card.audiomuxs[ idx ]);
212#endif /* AUDIOMUX_DISCOVER */
213
214	return( 0 );
215}
216
217
218/*
219 *
220 */
221void
222temp_mute( bktr_ptr_t bktr, int flag )
223{
224	static int	muteState = FALSE;
225
226	if ( flag == TRUE ) {
227		muteState = bktr->audio_mute_state;
228		set_audio( bktr, AUDIO_MUTE );		/* prevent 'click' */
229	}
230	else {
231		tsleep( BKTR_SLEEP, PZERO, "tuning", hz/8 );
232		if ( muteState == FALSE )
233			set_audio( bktr, AUDIO_UNMUTE );
234	}
235}
236
237/* address of BTSC/SAP decoder chip */
238#define TDA9850_WADDR           0xb6
239#define TDA9850_RADDR           0xb7
240
241
242/* registers in the TDA9850 BTSC/dbx chip */
243#define CON1ADDR                0x04
244#define CON2ADDR                0x05
245#define CON3ADDR                0x06
246#define CON4ADDR                0x07
247#define ALI1ADDR                0x08
248#define ALI2ADDR                0x09
249#define ALI3ADDR                0x0a
250
251/*
252 * initialise the dbx chip
253 * taken from the Linux bttv driver TDA9850 initialisation code
254 */
255void
256init_BTSC( bktr_ptr_t bktr )
257{
258    i2cWrite(bktr, TDA9850_WADDR, CON1ADDR, 0x08); /* noise threshold st */
259    i2cWrite(bktr, TDA9850_WADDR, CON2ADDR, 0x08); /* noise threshold sap */
260    i2cWrite(bktr, TDA9850_WADDR, CON3ADDR, 0x40); /* stereo mode */
261    i2cWrite(bktr, TDA9850_WADDR, CON4ADDR, 0x07); /* 0 dB input gain? */
262    i2cWrite(bktr, TDA9850_WADDR, ALI1ADDR, 0x10); /* wideband alignment? */
263    i2cWrite(bktr, TDA9850_WADDR, ALI2ADDR, 0x10); /* spectral alignment? */
264    i2cWrite(bktr, TDA9850_WADDR, ALI3ADDR, 0x03);
265}
266
267/*
268 * setup the dbx chip
269 * XXX FIXME: alot of work to be done here, this merely unmutes it.
270 */
271int
272set_BTSC( bktr_ptr_t bktr, int control )
273{
274	return( i2cWrite( bktr, TDA9850_WADDR, CON3ADDR, control ) );
275}
276
277/*
278 * CARD_GV_BCTV specific functions.
279 */
280
281#define BCTV_AUDIO_MAIN              0x10    /* main audio program */
282#define BCTV_AUDIO_SUB               0x20    /* sub audio program */
283#define BCTV_AUDIO_BOTH              0x30    /* main(L) + sub(R) program */
284
285#define BCTV_GPIO_REG0          1
286#define BCTV_GPIO_REG1          3
287
288#define BCTV_GR0_AUDIO_MODE     3
289#define BCTV_GR0_AUDIO_MAIN     0       /* main program */
290#define BCTV_GR0_AUDIO_SUB      3       /* sub program */
291#define BCTV_GR0_AUDIO_BOTH     1       /* main(L) + sub(R) */
292#define BCTV_GR0_AUDIO_MUTE     4       /* audio mute */
293#define BCTV_GR0_AUDIO_MONO     8       /* force mono */
294
295void
296set_bctv_audio( bktr_ptr_t bktr )
297{
298        int data;
299
300        switch (bktr->audio_mux_select) {
301        case 1:         /* external */
302        case 2:         /* internal */
303                bctv_gpio_write(bktr, BCTV_GPIO_REG1, 0);
304                break;
305        default:        /* tuner */
306                bctv_gpio_write(bktr, BCTV_GPIO_REG1, 1);
307                break;
308        }
309/*      switch (bktr->audio_sap_select) { */
310        switch (BCTV_AUDIO_BOTH) {
311        case BCTV_AUDIO_SUB:
312                data = BCTV_GR0_AUDIO_SUB;
313                break;
314        case BCTV_AUDIO_BOTH:
315                data = BCTV_GR0_AUDIO_BOTH;
316                break;
317        case BCTV_AUDIO_MAIN:
318        default:
319                data = BCTV_GR0_AUDIO_MAIN;
320                break;
321        }
322        if (bktr->audio_mute_state == TRUE)
323                data |= BCTV_GR0_AUDIO_MUTE;
324
325        bctv_gpio_write(bktr, BCTV_GPIO_REG0, data);
326
327        return;
328}
329
330/* gpio_data bit assignment */
331#define BCTV_GPIO_ADDR_MASK     0x000300
332#define BCTV_GPIO_WE            0x000400
333#define BCTV_GPIO_OE            0x000800
334#define BCTV_GPIO_VAL_MASK      0x00f000
335
336#define BCTV_GPIO_PORT_MASK     3
337#define BCTV_GPIO_ADDR_SHIFT    8
338#define BCTV_GPIO_VAL_SHIFT     12
339
340/* gpio_out_en value for read/write */
341#define BCTV_GPIO_OUT_RMASK     0x000f00
342#define BCTV_GPIO_OUT_WMASK     0x00ff00
343
344#define BCTV_BITS       100
345
346void
347bctv_gpio_write( bktr_ptr_t bktr, int port, int val )
348{
349        u_long data, outbits;
350
351        port &= BCTV_GPIO_PORT_MASK;
352        switch (port) {
353        case 1:
354        case 3:
355                data = ((val << BCTV_GPIO_VAL_SHIFT) & BCTV_GPIO_VAL_MASK) |
356                       ((port << BCTV_GPIO_ADDR_SHIFT) & BCTV_GPIO_ADDR_MASK) |
357                       BCTV_GPIO_WE | BCTV_GPIO_OE;
358                outbits = BCTV_GPIO_OUT_WMASK;
359                break;
360        default:
361                return;
362        }
363        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
364        OUTL(bktr, BKTR_GPIO_DATA, data);
365        OUTL(bktr, BKTR_GPIO_OUT_EN, outbits);
366        DELAY(BCTV_BITS);
367        OUTL(bktr, BKTR_GPIO_DATA, data & ~BCTV_GPIO_WE);
368        DELAY(BCTV_BITS);
369        OUTL(bktr, BKTR_GPIO_DATA, data);
370        DELAY(BCTV_BITS);
371        OUTL(bktr, BKTR_GPIO_DATA, ~0);
372        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
373}
374
375/* Not yet used
376int
377bctv_gpio_read( bktr_ptr_t bktr, int port )
378{
379        u_long data, outbits, ret;
380
381        port &= BCTV_GPIO_PORT_MASK;
382        switch (port) {
383        case 1:
384        case 3:
385                data = ((port << BCTV_GPIO_ADDR_SHIFT) & BCTV_GPIO_ADDR_MASK) |
386                       BCTV_GPIO_WE | BCTV_GPIO_OE;
387                outbits = BCTV_GPIO_OUT_RMASK;
388                break;
389        default:
390                return( -1 );
391        }
392        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
393        OUTL(bktr, BKTR_GPIO_DATA, data);
394        OUTL(bktr, BKTR_GPIO_OUT_EN, outbits);
395        DELAY(BCTV_BITS);
396        OUTL(bktr, BKTR_GPIO_DATA, data & ~BCTV_GPIO_OE);
397        DELAY(BCTV_BITS);
398        ret = INL(bktr, BKTR_GPIO_DATA);
399        DELAY(BCTV_BITS);
400        OUTL(bktr, BKTR_GPIO_DATA, data);
401        DELAY(BCTV_BITS);
402        OUTL(bktr, BKTR_GPIO_DATA, ~0);
403        OUTL(bktr, BKTR_GPIO_OUT_EN, 0);
404        return( (ret & BCTV_GPIO_VAL_MASK) >> BCTV_GPIO_VAL_SHIFT );
405}
406*/
407
408/*
409 * setup the MSP34xx Stereo Audio Chip
410 * This uses the Auto Configuration Option on MSP3410D and MSP3415D chips
411 * and DBX mode selection for MSP3430G chips.
412 * For MSP3400C support, the full programming sequence is required and is
413 * not yet supported.
414 */
415
416/* Read the MSP version string */
417void msp_read_id( bktr_ptr_t bktr ){
418    int rev1=0, rev2=0;
419    rev1 = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x001e);
420    rev2 = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x001f);
421
422    sprintf(bktr->msp_version_string, "34%02d%c-%c%d",
423      (rev2>>8)&0xff, (rev1&0xff)+'@', ((rev1>>8)&0xff)+'@', rev2&0x1f);
424
425}
426
427
428/* Configure the MSP chip to Auto-detect the audio format.
429 * For the MSP3430G, we use fast autodetect mode
430 * For the MSP3410/3415 there are two schemes for this
431 *  a) Fast autodetection - the chip is put into autodetect mode, and the function
432 *     returns immediatly. This works in most cases and is the Default Mode.
433 *  b) Slow mode. The function sets the MSP3410/3415 chip, then waits for feedback from
434 *     the chip and re-programs it if needed.
435 */
436void msp_autodetect( bktr_ptr_t bktr ) {
437  int auto_detect, loops;
438  int stereo;
439
440  /* MSP3430G - countries with mono and DBX stereo */
441  if (strncmp("3430G", bktr->msp_version_string, 5) == 0){
442
443    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0030,0x2003);/* Enable Auto format detection */
444    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0020);/* Standard Select Reg. = BTSC-Stereo*/
445    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000E,0x2403);/* darned if I know */
446    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0320);/* Source select = (St or A) */
447					                     /* & Ch. Matrix = St */
448    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
449  }
450
451
452  /* MSP3410/MSP3415 - countries with mono, stereo using 2 FM channels and NICAM */
453  /* FAST sound scheme */
454  if ( (strncmp("3430G", bktr->msp_version_string, 5) != 0)
455    && (bktr->slow_msp_audio == 0) ){
456    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
457    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0001);/* Enable Auto format detection */
458    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0021,0x0001);/* Auto selection of NICAM/MONO mode */
459  }
460
461
462  /* MSP3410/MSP3415 - European Countries where the fast MSP3410/3415 programming fails */
463  /* SLOW sound scheme */
464  if ( (strncmp("3430G", bktr->msp_version_string, 5) != 0)
465    && (bktr->slow_msp_audio == 1) ){
466    msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0000,0x7300);/* Set volume to 0db gain */
467    msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0020,0x0001);/* Enable Auto format detection */
468
469    /* wait for 0.5s max for terrestrial sound autodetection */
470    loops = 10;
471    do {
472      DELAY(100000);
473      auto_detect = msp_dpl_read(bktr, bktr->msp_addr, 0x10, 0x007e);
474      loops++;
475    } while (auto_detect > 0xff && loops < 50);
476    if (bootverbose)printf ("%s: Result of autodetect after %dms: %d\n",
477			    bktr_name(bktr), loops*10, auto_detect);
478
479    /* Now set the audio baseband processing */
480    switch (auto_detect) {
481    case 0:                    /* no TV sound standard detected */
482      break;
483    case 2:                    /* M Dual FM */
484      break;
485    case 3:                    /* B/G Dual FM; German stereo */
486      /* Read the stereo detection value from DSP reg 0x0018 */
487      DELAY(20000);
488      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
489      if (bootverbose)printf ("%s: Stereo reg 0x18 a: %d\n",
490			      bktr_name(bktr), stereo);
491      DELAY(20000);
492      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
493      if (bootverbose)printf ("%s: Stereo reg 0x18 b: %d\n",
494			      bktr_name(bktr), stereo);
495      DELAY(20000);
496      stereo = msp_dpl_read(bktr, bktr->msp_addr, 0x12, 0x0018);
497      if (bootverbose)printf ("%s: Stereo reg 0x18 c: %d\n",
498			      bktr_name(bktr), stereo);
499      if (stereo > 0x0100 && stereo < 0x8000) { /* Seems to be stereo */
500        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0020);/* Loudspeaker set stereo*/
501        /*
502          set spatial effect strength to 50% enlargement
503          set spatial effect mode b, stereo basewidth enlargment only
504        */
505        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x3f28);
506      } else if (stereo > 0x8000) {    /* bilingual mode */
507        if (bootverbose) printf ("%s: Bilingual mode detected\n",
508				 bktr_name(bktr));
509        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0000);/* Loudspeaker */
510        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x0000);/* all spatial effects off */
511       } else {                 /* must be mono */
512        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0030);/* Loudspeaker */
513        /*
514          set spatial effect strength to 50% enlargement
515          set spatial effect mode a, stereo basewidth enlargment
516          and pseudo stereo effect with automatic high-pass filter
517        */
518        msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0005,0x3f08);
519      }
520#if 0
521       /* The reset value for Channel matrix mode is FM/AM and SOUNDA/LEFT */
522       /* We would like STEREO instead val: 0x0020 */
523       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0008,0x0020);/* Loudspeaker */
524       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0009,0x0020);/* Headphone */
525       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000a,0x0020);/* SCART1 */
526       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0041,0x0020);/* SCART2 */
527       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000b,0x0020);/* I2S */
528       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000c,0x0020);/* Quasi-Peak Detector Source */
529       msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x000e,0x0001);
530#endif
531      break;
532    case 8:                    /* B/G FM NICAM */
533       msp_dpl_write(bktr, bktr->msp_addr, 0x10, 0x0021,0x0001);/* Auto selection of NICAM/MONO mode */
534       break;
535     case 9:                    /* L_AM NICAM or D/K*/
536     case 10:                   /* i-FM NICAM */
537       break;
538     default:
539       if (bootverbose) printf ("%s: Unknown autodetection result value: %d\n",
540				bktr_name(bktr), auto_detect);
541     }
542
543  }
544
545
546  /* uncomment the following line to enable the MSP34xx 1Khz Tone Generator */
547  /* turn your speaker volume down low before trying this */
548  /* msp_dpl_write(bktr, bktr->msp_addr, 0x12, 0x0014, 0x7f40); */
549}
550
551/* Read the DPL version string */
552void dpl_read_id( bktr_ptr_t bktr ){
553    int rev1=0, rev2=0;
554    rev1 = msp_dpl_read(bktr, bktr->dpl_addr, 0x12, 0x001e);
555    rev2 = msp_dpl_read(bktr, bktr->dpl_addr, 0x12, 0x001f);
556
557    sprintf(bktr->dpl_version_string, "34%02d%c-%c%d",
558      ((rev2>>8)&0xff)-1, (rev1&0xff)+'@', ((rev1>>8)&0xff)+'@', rev2&0x1f);
559}
560
561/* Configure the DPL chip to Auto-detect the audio format */
562void dpl_autodetect( bktr_ptr_t bktr ) {
563
564    /* The following are empiric values tried from the DPL35xx data sheet */
565    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x000c,0x0320);	/* quasi peak detector source dolby
566								lr 0x03xx; quasi peak detector matrix
567								stereo 0xXX20 */
568    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0040,0x0060);	/* Surround decoder mode;
569								ADAPTIVE/3D-PANORAMA, that means two
570								speakers and no center speaker, all
571								channels L/R/C/S mixed to L and R */
572    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0041,0x0620);	/* surround source matrix;I2S2/STEREO*/
573    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0042,0x1F00);	/* surround delay 31ms max */
574    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0043,0x0000);	/* automatic surround input balance */
575    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0044,0x4000);	/* surround spatial effect 50%
576								recommended*/
577    msp_dpl_write(bktr, bktr->dpl_addr, 0x12, 0x0045,0x5400);	/* surround panorama effect 66%
578								recommended with PANORAMA mode
579								in 0x0040 set to panorama */
580}
581
582