summaryrefslogtreecommitdiff
path: root/sound/hda/hdmi_chmap.c
blob: c6c75e7e0981affde1d06b508f551b7be25733a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
/*
 * HDMI Channel map support helpers
 */

#include <linux/module.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/hda_chmap.h>

/*
 * CEA speaker placement:
 *
 *        FLH       FCH        FRH
 *  FLW    FL  FLC   FC   FRC   FR   FRW
 *
 *                                  LFE
 *                     TC
 *
 *          RL  RLC   RC   RRC   RR
 *
 * The Left/Right Surround channel _notions_ LS/RS in SMPTE 320M corresponds to
 * CEA RL/RR; The SMPTE channel _assignment_ C/LFE is swapped to CEA LFE/FC.
 */
enum cea_speaker_placement {
	FL  = (1 <<  0),	/* Front Left           */
	FC  = (1 <<  1),	/* Front Center         */
	FR  = (1 <<  2),	/* Front Right          */
	FLC = (1 <<  3),	/* Front Left Center    */
	FRC = (1 <<  4),	/* Front Right Center   */
	RL  = (1 <<  5),	/* Rear Left            */
	RC  = (1 <<  6),	/* Rear Center          */
	RR  = (1 <<  7),	/* Rear Right           */
	RLC = (1 <<  8),	/* Rear Left Center     */
	RRC = (1 <<  9),	/* Rear Right Center    */
	LFE = (1 << 10),	/* Low Frequency Effect */
	FLW = (1 << 11),	/* Front Left Wide      */
	FRW = (1 << 12),	/* Front Right Wide     */
	FLH = (1 << 13),	/* Front Left High      */
	FCH = (1 << 14),	/* Front Center High    */
	FRH = (1 << 15),	/* Front Right High     */
	TC  = (1 << 16),	/* Top Center           */
};

static const char * const cea_speaker_allocation_names[] = {
	/*  0 */ "FL/FR",
	/*  1 */ "LFE",
	/*  2 */ "FC",
	/*  3 */ "RL/RR",
	/*  4 */ "RC",
	/*  5 */ "FLC/FRC",
	/*  6 */ "RLC/RRC",
	/*  7 */ "FLW/FRW",
	/*  8 */ "FLH/FRH",
	/*  9 */ "TC",
	/* 10 */ "FCH",
};

/*
 * ELD SA bits in the CEA Speaker Allocation data block
 */
static int eld_speaker_allocation_bits[] = {
	[0] = FL | FR,
	[1] = LFE,
	[2] = FC,
	[3] = RL | RR,
	[4] = RC,
	[5] = FLC | FRC,
	[6] = RLC | RRC,
	/* the following are not defined in ELD yet */
	[7] = FLW | FRW,
	[8] = FLH | FRH,
	[9] = TC,
	[10] = FCH,
};

/*
 * ALSA sequence is:
 *
 *       surround40   surround41   surround50   surround51   surround71
 * ch0   front left   =            =            =            =
 * ch1   front right  =            =            =            =
 * ch2   rear left    =            =            =            =
 * ch3   rear right   =            =            =            =
 * ch4                LFE          center       center       center
 * ch5                                          LFE          LFE
 * ch6                                                       side left
 * ch7                                                       side right
 *
 * surround71 = {FL, FR, RLC, RRC, FC, LFE, RL, RR}
 */
static int hdmi_channel_mapping[0x32][8] = {
	/* stereo */
	[0x00] = { 0x00, 0x11, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7 },
	/* 2.1 */
	[0x01] = { 0x00, 0x11, 0x22, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7 },
	/* Dolby Surround */
	[0x02] = { 0x00, 0x11, 0x23, 0xf2, 0xf4, 0xf5, 0xf6, 0xf7 },
	/* surround40 */
	[0x08] = { 0x00, 0x11, 0x24, 0x35, 0xf3, 0xf2, 0xf6, 0xf7 },
	/* 4ch */
	[0x03] = { 0x00, 0x11, 0x23, 0x32, 0x44, 0xf5, 0xf6, 0xf7 },
	/* surround41 */
	[0x09] = { 0x00, 0x11, 0x24, 0x35, 0x42, 0xf3, 0xf6, 0xf7 },
	/* surround50 */
	[0x0a] = { 0x00, 0x11, 0x24, 0x35, 0x43, 0xf2, 0xf6, 0xf7 },
	/* surround51 */
	[0x0b] = { 0x00, 0x11, 0x24, 0x35, 0x43, 0x52, 0xf6, 0xf7 },
	/* 7.1 */
	[0x13] = { 0x00, 0x11, 0x26, 0x37, 0x43, 0x52, 0x64, 0x75 },
};

/*
 * This is an ordered list!
 *
 * The preceding ones have better chances to be selected by
 * hdmi_channel_allocation().
 */
static struct hdac_cea_channel_speaker_allocation channel_allocations[] = {
/*			  channel:   7     6    5    4    3     2    1    0  */
{ .ca_index = 0x00,  .speakers = {   0,    0,   0,   0,   0,    0,  FR,  FL } },
				 /* 2.1 */
{ .ca_index = 0x01,  .speakers = {   0,    0,   0,   0,   0,  LFE,  FR,  FL } },
				 /* Dolby Surround */
{ .ca_index = 0x02,  .speakers = {   0,    0,   0,   0,  FC,    0,  FR,  FL } },
				 /* surround40 */
{ .ca_index = 0x08,  .speakers = {   0,    0,  RR,  RL,   0,    0,  FR,  FL } },
				 /* surround41 */
{ .ca_index = 0x09,  .speakers = {   0,    0,  RR,  RL,   0,  LFE,  FR,  FL } },
				 /* surround50 */
{ .ca_index = 0x0a,  .speakers = {   0,    0,  RR,  RL,  FC,    0,  FR,  FL } },
				 /* surround51 */
{ .ca_index = 0x0b,  .speakers = {   0,    0,  RR,  RL,  FC,  LFE,  FR,  FL } },
				 /* 6.1 */
{ .ca_index = 0x0f,  .speakers = {   0,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
				 /* surround71 */
{ .ca_index = 0x13,  .speakers = { RRC,  RLC,  RR,  RL,  FC,  LFE,  FR,  FL } },

{ .ca_index = 0x03,  .speakers = {   0,    0,   0,   0,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x04,  .speakers = {   0,    0,   0,  RC,   0,    0,  FR,  FL } },
{ .ca_index = 0x05,  .speakers = {   0,    0,   0,  RC,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x06,  .speakers = {   0,    0,   0,  RC,  FC,    0,  FR,  FL } },
{ .ca_index = 0x07,  .speakers = {   0,    0,   0,  RC,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x0c,  .speakers = {   0,   RC,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x0d,  .speakers = {   0,   RC,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x0e,  .speakers = {   0,   RC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x10,  .speakers = { RRC,  RLC,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x11,  .speakers = { RRC,  RLC,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x12,  .speakers = { RRC,  RLC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x14,  .speakers = { FRC,  FLC,   0,   0,   0,    0,  FR,  FL } },
{ .ca_index = 0x15,  .speakers = { FRC,  FLC,   0,   0,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x16,  .speakers = { FRC,  FLC,   0,   0,  FC,    0,  FR,  FL } },
{ .ca_index = 0x17,  .speakers = { FRC,  FLC,   0,   0,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x18,  .speakers = { FRC,  FLC,   0,  RC,   0,    0,  FR,  FL } },
{ .ca_index = 0x19,  .speakers = { FRC,  FLC,   0,  RC,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x1a,  .speakers = { FRC,  FLC,   0,  RC,  FC,    0,  FR,  FL } },
{ .ca_index = 0x1b,  .speakers = { FRC,  FLC,   0,  RC,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x1c,  .speakers = { FRC,  FLC,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x1d,  .speakers = { FRC,  FLC,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x1e,  .speakers = { FRC,  FLC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x1f,  .speakers = { FRC,  FLC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x20,  .speakers = {   0,  FCH,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x21,  .speakers = {   0,  FCH,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x22,  .speakers = {  TC,    0,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x23,  .speakers = {  TC,    0,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x24,  .speakers = { FRH,  FLH,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x25,  .speakers = { FRH,  FLH,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x26,  .speakers = { FRW,  FLW,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x27,  .speakers = { FRW,  FLW,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x28,  .speakers = {  TC,   RC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x29,  .speakers = {  TC,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x2a,  .speakers = { FCH,   RC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x2b,  .speakers = { FCH,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x2c,  .speakers = {  TC,  FCH,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x2d,  .speakers = {  TC,  FCH,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x2e,  .speakers = { FRH,  FLH,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x2f,  .speakers = { FRH,  FLH,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x30,  .speakers = { FRW,  FLW,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x31,  .speakers = { FRW,  FLW,  RR,  RL,  FC,  LFE,  FR,  FL } },
};

static int hdmi_pin_set_slot_channel(struct hdac_device *codec,
		hda_nid_t pin_nid, int asp_slot, int channel)
{
	return snd_hdac_codec_write(codec, pin_nid, 0,
				AC_VERB_SET_HDMI_CHAN_SLOT,
				(channel << 4) | asp_slot);
}

static int hdmi_pin_get_slot_channel(struct hdac_device *codec,
			hda_nid_t pin_nid, int asp_slot)
{
	return (snd_hdac_codec_read(codec, pin_nid, 0,
				   AC_VERB_GET_HDMI_CHAN_SLOT,
				   asp_slot) & 0xf0) >> 4;
}

static int hdmi_get_channel_count(struct hdac_device *codec, hda_nid_t cvt_nid)
{
	return 1 + snd_hdac_codec_read(codec, cvt_nid, 0,
					AC_VERB_GET_CVT_CHAN_COUNT, 0);
}

static void hdmi_set_channel_count(struct hdac_device *codec,
				   hda_nid_t cvt_nid, int chs)
{
	if (chs != hdmi_get_channel_count(codec, cvt_nid))
		snd_hdac_codec_write(codec, cvt_nid, 0,
				    AC_VERB_SET_CVT_CHAN_COUNT, chs - 1);
}

/*
 * Channel mapping routines
 */

/*
 * Compute derived values in channel_allocations[].
 */
static void init_channel_allocations(void)
{
	int i, j;
	struct hdac_cea_channel_speaker_allocation *p;

	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
		p = channel_allocations + i;
		p->channels = 0;
		p->spk_mask = 0;
		for (j = 0; j < ARRAY_SIZE(p->speakers); j++)
			if (p->speakers[j]) {
				p->channels++;
				p->spk_mask |= p->speakers[j];
			}
	}
}

static int get_channel_allocation_order(int ca)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
		if (channel_allocations[i].ca_index == ca)
			break;
	}
	return i;
}

void snd_hdac_print_channel_allocation(int spk_alloc, char *buf, int buflen)
{
	int i, j;

	for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
		if (spk_alloc & (1 << i))
			j += snprintf(buf + j, buflen - j,  " %s",
					cea_speaker_allocation_names[i]);
	}
	buf[j] = '\0';	/* necessary when j == 0 */
}
EXPORT_SYMBOL_GPL(snd_hdac_print_channel_allocation);

/*
 * The transformation takes two steps:
 *
 *	eld->spk_alloc => (eld_speaker_allocation_bits[]) => spk_mask
 *	      spk_mask => (channel_allocations[])         => ai->CA
 *
 * TODO: it could select the wrong CA from multiple candidates.
*/
static int hdmi_channel_allocation_spk_alloc_blk(struct hdac_device *codec,
				   int spk_alloc, int channels)
{
	int i;
	int ca = 0;
	int spk_mask = 0;
	char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];

	/*
	 * CA defaults to 0 for basic stereo audio
	 */
	if (channels <= 2)
		return 0;

	/*
	 * expand ELD's speaker allocation mask
	 *
	 * ELD tells the speaker mask in a compact(paired) form,
	 * expand ELD's notions to match the ones used by Audio InfoFrame.
	 */
	for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
		if (spk_alloc & (1 << i))
			spk_mask |= eld_speaker_allocation_bits[i];
	}

	/* search for the first working match in the CA table */
	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
		if (channels == channel_allocations[i].channels &&
		    (spk_mask & channel_allocations[i].spk_mask) ==
				channel_allocations[i].spk_mask) {
			ca = channel_allocations[i].ca_index;
			break;
		}
	}

	if (!ca) {
		/*
		 * if there was no match, select the regular ALSA channel
		 * allocation with the matching number of channels
		 */
		for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
			if (channels == channel_allocations[i].channels) {
				ca = channel_allocations[i].ca_index;
				break;
			}
		}
	}

	snd_hdac_print_channel_allocation(spk_alloc, buf, sizeof(buf));
	dev_dbg(&codec->dev, "HDMI: select CA 0x%x for %d-channel allocation: %s\n",
		    ca, channels, buf);

	return ca;
}

static void hdmi_debug_channel_mapping(struct hdac_chmap *chmap,
				       hda_nid_t pin_nid)
{
#ifdef CONFIG_SND_DEBUG_VERBOSE
	int i;
	int channel;

	for (i = 0; i < 8; i++) {
		channel = chmap->ops.pin_get_slot_channel(
				chmap->hdac, pin_nid, i);
		dev_dbg(&chmap->hdac->dev, "HDMI: ASP channel %d => slot %d\n",
						channel, i);
	}
#endif
}

static void hdmi_std_setup_channel_mapping(struct hdac_chmap *chmap,
				       hda_nid_t pin_nid,
				       bool non_pcm,
				       int ca)
{
	struct hdac_cea_channel_speaker_allocation *ch_alloc;
	int i;
	int err;
	int order;
	int non_pcm_mapping[8];

	order = get_channel_allocation_order(ca);
	ch_alloc = &channel_allocations[order];

	if (hdmi_channel_mapping[ca][1] == 0) {
		int hdmi_slot = 0;
		/* fill actual channel mappings in ALSA channel (i) order */
		for (i = 0; i < ch_alloc->channels; i++) {
			while (!ch_alloc->speakers[7 - hdmi_slot] && !WARN_ON(hdmi_slot >= 8))
				hdmi_slot++; /* skip zero slots */

			hdmi_channel_mapping[ca][i] = (i << 4) | hdmi_slot++;
		}
		/* fill the rest of the slots with ALSA channel 0xf */
		for (hdmi_slot = 0; hdmi_slot < 8; hdmi_slot++)
			if (!ch_alloc->speakers[7 - hdmi_slot])
				hdmi_channel_mapping[ca][i++] = (0xf << 4) | hdmi_slot;
	}

	if (non_pcm) {
		for (i = 0; i < ch_alloc->channels; i++)
			non_pcm_mapping[i] = (i << 4) | i;
		for (; i < 8; i++)
			non_pcm_mapping[i] = (0xf << 4) | i;
	}

	for (i = 0; i < 8; i++) {
		int slotsetup = non_pcm ? non_pcm_mapping[i] : hdmi_channel_mapping[ca][i];
		int hdmi_slot = slotsetup & 0x0f;
		int channel = (slotsetup & 0xf0) >> 4;

		err = chmap->ops.pin_set_slot_channel(chmap->hdac,
				pin_nid, hdmi_slot, channel);
		if (err) {
			dev_dbg(&chmap->hdac->dev, "HDMI: channel mapping failed\n");
			break;
		}
	}
}

struct channel_map_table {
	unsigned char map;		/* ALSA API channel map position */
	int spk_mask;			/* speaker position bit mask */
};

static struct channel_map_table map_tables[] = {
	{ SNDRV_CHMAP_FL,	FL },
	{ SNDRV_CHMAP_FR,	FR },
	{ SNDRV_CHMAP_RL,	RL },
	{ SNDRV_CHMAP_RR,	RR },
	{ SNDRV_CHMAP_LFE,	LFE },
	{ SNDRV_CHMAP_FC,	FC },
	{ SNDRV_CHMAP_RLC,	RLC },
	{ SNDRV_CHMAP_RRC,	RRC },
	{ SNDRV_CHMAP_RC,	RC },
	{ SNDRV_CHMAP_FLC,	FLC },
	{ SNDRV_CHMAP_FRC,	FRC },
	{ SNDRV_CHMAP_TFL,	FLH },
	{ SNDRV_CHMAP_TFR,	FRH },
	{ SNDRV_CHMAP_FLW,	FLW },
	{ SNDRV_CHMAP_FRW,	FRW },
	{ SNDRV_CHMAP_TC,	TC },
	{ SNDRV_CHMAP_TFC,	FCH },
	{} /* terminator */
};

/* from ALSA API channel position to speaker bit mask */
int snd_hdac_chmap_to_spk_mask(unsigned char c)
{
	struct channel_map_table *t = map_tables;

	for (; t->map; t++) {
		if (t->map == c)
			return t->spk_mask;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_chmap_to_spk_mask);

/* from ALSA API channel position to CEA slot */
static int to_cea_slot(int ordered_ca, unsigned char pos)
{
	int mask = snd_hdac_chmap_to_spk_mask(pos);
	int i;

	if (mask) {
		for (i = 0; i < 8; i++) {
			if (channel_allocations[ordered_ca].speakers[7 - i] == mask)
				return i;
		}
	}

	return -1;
}

/* from speaker bit mask to ALSA API channel position */
int snd_hdac_spk_to_chmap(int spk)
{
	struct channel_map_table *t = map_tables;

	for (; t->map; t++) {
		if (t->spk_mask == spk)
			return t->map;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_spk_to_chmap);

/* from CEA slot to ALSA API channel position */
static int from_cea_slot(int ordered_ca, unsigned char slot)
{
	int mask = channel_allocations[ordered_ca].speakers[7 - slot];

	return snd_hdac_spk_to_chmap(mask);
}

/* get the CA index corresponding to the given ALSA API channel map */
static int hdmi_manual_channel_allocation(int chs, unsigned char *map)
{
	int i, spks = 0, spk_mask = 0;

	for (i = 0; i < chs; i++) {
		int mask = snd_hdac_chmap_to_spk_mask(map[i]);

		if (mask) {
			spk_mask |= mask;
			spks++;
		}
	}

	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
		if ((chs == channel_allocations[i].channels ||
		     spks == channel_allocations[i].channels) &&
		    (spk_mask & channel_allocations[i].spk_mask) ==
				channel_allocations[i].spk_mask)
			return channel_allocations[i].ca_index;
	}
	return -1;
}

/* set up the channel slots for the given ALSA API channel map */
static int hdmi_manual_setup_channel_mapping(struct hdac_chmap *chmap,
					     hda_nid_t pin_nid,
					     int chs, unsigned char *map,
					     int ca)
{
	int ordered_ca = get_channel_allocation_order(ca);
	int alsa_pos, hdmi_slot;
	int assignments[8] = {[0 ... 7] = 0xf};

	for (alsa_pos = 0; alsa_pos < chs; alsa_pos++) {

		hdmi_slot = to_cea_slot(ordered_ca, map[alsa_pos]);

		if (hdmi_slot < 0)
			continue; /* unassigned channel */

		assignments[hdmi_slot] = alsa_pos;
	}

	for (hdmi_slot = 0; hdmi_slot < 8; hdmi_slot++) {
		int err;

		err = chmap->ops.pin_set_slot_channel(chmap->hdac,
				pin_nid, hdmi_slot, assignments[hdmi_slot]);
		if (err)
			return -EINVAL;
	}
	return 0;
}

/* store ALSA API channel map from the current default map */
static void hdmi_setup_fake_chmap(unsigned char *map, int ca)
{
	int i;
	int ordered_ca = get_channel_allocation_order(ca);

	for (i = 0; i < 8; i++) {
		if (i < channel_allocations[ordered_ca].channels)
			map[i] = from_cea_slot(ordered_ca, hdmi_channel_mapping[ca][i] & 0x0f);
		else
			map[i] = 0;
	}
}

void snd_hdac_setup_channel_mapping(struct hdac_chmap *chmap,
				       hda_nid_t pin_nid, bool non_pcm, int ca,
				       int channels, unsigned char *map,
				       bool chmap_set)
{
	if (!non_pcm && chmap_set) {
		hdmi_manual_setup_channel_mapping(chmap, pin_nid,
						  channels, map, ca);
	} else {
		hdmi_std_setup_channel_mapping(chmap, pin_nid, non_pcm, ca);
		hdmi_setup_fake_chmap(map, ca);
	}

	hdmi_debug_channel_mapping(chmap, pin_nid);
}
EXPORT_SYMBOL_GPL(snd_hdac_setup_channel_mapping);

int snd_hdac_get_active_channels(int ca)
{
	int ordered_ca = get_channel_allocation_order(ca);

	return channel_allocations[ordered_ca].channels;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_active_channels);

struct hdac_cea_channel_speaker_allocation *snd_hdac_get_ch_alloc_from_ca(int ca)
{
	return &channel_allocations[get_channel_allocation_order(ca)];
}
EXPORT_SYMBOL_GPL(snd_hdac_get_ch_alloc_from_ca);

int snd_hdac_channel_allocation(struct hdac_device *hdac, int spk_alloc,
		int channels, bool chmap_set, bool non_pcm, unsigned char *map)
{
	int ca;

	if (!non_pcm && chmap_set)
		ca = hdmi_manual_channel_allocation(channels, map);
	else
		ca = hdmi_channel_allocation_spk_alloc_blk(hdac,
					spk_alloc, channels);

	if (ca < 0)
		ca = 0;

	return ca;
}
EXPORT_SYMBOL_GPL(snd_hdac_channel_allocation);

/*
 * ALSA API channel-map control callbacks
 */
static int hdmi_chmap_ctl_info(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_info *uinfo)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
	struct hdac_chmap *chmap = info->private_data;

	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = chmap->channels_max;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = SNDRV_CHMAP_LAST;
	return 0;
}

static int hdmi_chmap_cea_alloc_validate_get_type(struct hdac_chmap *chmap,
		struct hdac_cea_channel_speaker_allocation *cap, int channels)
{
	/* If the speaker allocation matches the channel count, it is OK.*/
	if (cap->channels != channels)
		return -1;

	/* all channels are remappable freely */
	return SNDRV_CTL_TLVT_CHMAP_VAR;
}

static void hdmi_cea_alloc_to_tlv_chmap(struct hdac_chmap *hchmap,
		struct hdac_cea_channel_speaker_allocation *cap,
		unsigned int *chmap, int channels)
{
	int count = 0;
	int c;

	for (c = 7; c >= 0; c--) {
		int spk = cap->speakers[c];

		if (!spk)
			continue;

		chmap[count++] = snd_hdac_spk_to_chmap(spk);
	}

	WARN_ON(count != channels);
}

static int spk_mask_from_spk_alloc(int spk_alloc)
{
	int i;
	int spk_mask = eld_speaker_allocation_bits[0];

	for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
		if (spk_alloc & (1 << i))
			spk_mask |= eld_speaker_allocation_bits[i];
	}

	return spk_mask;
}

static int hdmi_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
			      unsigned int size, unsigned int __user *tlv)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
	struct hdac_chmap *chmap = info->private_data;
	int pcm_idx = kcontrol->private_value;
	unsigned int __user *dst;
	int chs, count = 0;
	unsigned long max_chs;
	int type;
	int spk_alloc, spk_mask;

	if (size < 8)
		return -ENOMEM;
	if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
		return -EFAULT;
	size -= 8;
	dst = tlv + 2;

	spk_alloc = chmap->ops.get_spk_alloc(chmap->hdac, pcm_idx);
	spk_mask = spk_mask_from_spk_alloc(spk_alloc);

	max_chs = hweight_long(spk_mask);

	for (chs = 2; chs <= max_chs; chs++) {
		int i;
		struct hdac_cea_channel_speaker_allocation *cap;

		cap = channel_allocations;
		for (i = 0; i < ARRAY_SIZE(channel_allocations); i++, cap++) {
			int chs_bytes = chs * 4;
			unsigned int tlv_chmap[8];

			if (cap->channels != chs)
				continue;

			if (!(cap->spk_mask == (spk_mask & cap->spk_mask)))
				continue;

			type = chmap->ops.chmap_cea_alloc_validate_get_type(
							chmap, cap, chs);
			if (type < 0)
				return -ENODEV;
			if (size < 8)
				return -ENOMEM;

			if (put_user(type, dst) ||
			    put_user(chs_bytes, dst + 1))
				return -EFAULT;

			dst += 2;
			size -= 8;
			count += 8;

			if (size < chs_bytes)
				return -ENOMEM;

			size -= chs_bytes;
			count += chs_bytes;
			chmap->ops.cea_alloc_to_tlv_chmap(chmap, cap,
						tlv_chmap, chs);

			if (copy_to_user(dst, tlv_chmap, chs_bytes))
				return -EFAULT;
			dst += chs;
		}
	}

	if (put_user(count, tlv + 1))
		return -EFAULT;

	return 0;
}

static int hdmi_chmap_ctl_get(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
	struct hdac_chmap *chmap = info->private_data;
	int pcm_idx = kcontrol->private_value;
	unsigned char pcm_chmap[8];
	int i;

	memset(pcm_chmap, 0, sizeof(pcm_chmap));
	chmap->ops.get_chmap(chmap->hdac, pcm_idx, pcm_chmap);

	for (i = 0; i < sizeof(chmap); i++)
		ucontrol->value.integer.value[i] = pcm_chmap[i];

	return 0;
}

static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
	struct hdac_chmap *hchmap = info->private_data;
	int pcm_idx = kcontrol->private_value;
	unsigned int ctl_idx;
	struct snd_pcm_substream *substream;
	unsigned char chmap[8], per_pin_chmap[8];
	int i, err, ca, prepared = 0;

	/* No monitor is connected in dyn_pcm_assign.
	 * It's invalid to setup the chmap
	 */
	if (!hchmap->ops.is_pcm_attached(hchmap->hdac, pcm_idx))
		return 0;

	ctl_idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
	substream = snd_pcm_chmap_substream(info, ctl_idx);
	if (!substream || !substream->runtime)
		return 0; /* just for avoiding error from alsactl restore */
	switch (substream->runtime->status->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_SETUP:
		break;
	case SNDRV_PCM_STATE_PREPARED:
		prepared = 1;
		break;
	default:
		return -EBUSY;
	}
	memset(chmap, 0, sizeof(chmap));
	for (i = 0; i < ARRAY_SIZE(chmap); i++)
		chmap[i] = ucontrol->value.integer.value[i];

	hchmap->ops.get_chmap(hchmap->hdac, pcm_idx, per_pin_chmap);
	if (!memcmp(chmap, per_pin_chmap, sizeof(chmap)))
		return 0;
	ca = hdmi_manual_channel_allocation(ARRAY_SIZE(chmap), chmap);
	if (ca < 0)
		return -EINVAL;
	if (hchmap->ops.chmap_validate) {
		err = hchmap->ops.chmap_validate(hchmap, ca,
				ARRAY_SIZE(chmap), chmap);
		if (err)
			return err;
	}

	hchmap->ops.set_chmap(hchmap->hdac, pcm_idx, chmap, prepared);

	return 0;
}

static const struct hdac_chmap_ops chmap_ops = {
	.chmap_cea_alloc_validate_get_type	= hdmi_chmap_cea_alloc_validate_get_type,
	.cea_alloc_to_tlv_chmap			= hdmi_cea_alloc_to_tlv_chmap,
	.pin_get_slot_channel			= hdmi_pin_get_slot_channel,
	.pin_set_slot_channel			= hdmi_pin_set_slot_channel,
	.set_channel_count			= hdmi_set_channel_count,
};

void snd_hdac_register_chmap_ops(struct hdac_device *hdac,
				struct hdac_chmap *chmap)
{
	chmap->ops = chmap_ops;
	chmap->hdac = hdac;
	init_channel_allocations();
}
EXPORT_SYMBOL_GPL(snd_hdac_register_chmap_ops);

int snd_hdac_add_chmap_ctls(struct snd_pcm *pcm, int pcm_idx,
				struct hdac_chmap *hchmap)
{
	struct snd_pcm_chmap *chmap;
	struct snd_kcontrol *kctl;
	int err, i;

	err = snd_pcm_add_chmap_ctls(pcm,
				     SNDRV_PCM_STREAM_PLAYBACK,
				     NULL, 0, pcm_idx, &chmap);
	if (err < 0)
		return err;
	/* override handlers */
	chmap->private_data = hchmap;
	kctl = chmap->kctl;
	for (i = 0; i < kctl->count; i++)
		kctl->vd[i].access |= SNDRV_CTL_ELEM_ACCESS_WRITE;
	kctl->info = hdmi_chmap_ctl_info;
	kctl->get = hdmi_chmap_ctl_get;
	kctl->put = hdmi_chmap_ctl_put;
	kctl->tlv.c = hdmi_chmap_ctl_tlv;

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_add_chmap_ctls);