Free Electrons

Embedded Linux Experts

  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
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
/*
 * wm8731.c  --  WM8731 ALSA SoC Audio driver
 *
 * Copyright 2005 Openedhand Ltd.
 * Copyright 2006-12 Wolfson Microelectronics, plc
 *
 * Author: Richard Purdie <richard@openedhand.com>
 *
 * Based on wm8753.c by Liam Girdwood
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <linux/of_device.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "wm8731.h"

#define WM8731_NUM_SUPPLIES 4
static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
	"AVDD",
	"HPVDD",
	"DCVDD",
	"DBVDD",
};

/* codec private data */
struct wm8731_priv {
	struct regmap *regmap;
	struct clk *mclk;
	struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
	const struct snd_pcm_hw_constraint_list *constraints;
	unsigned int sysclk;
	int sysclk_type;
	int playback_fs;
	bool deemph;

	struct mutex lock;
};


/*
 * wm8731 register cache
 */
static const struct reg_default wm8731_reg_defaults[] = {
	{ 0, 0x0097 },
	{ 1, 0x0097 },
	{ 2, 0x0079 },
	{ 3, 0x0079 },
	{ 4, 0x000a },
	{ 5, 0x0008 },
	{ 6, 0x009f },
	{ 7, 0x000a },
	{ 8, 0x0000 },
	{ 9, 0x0000 },
};

static bool wm8731_volatile(struct device *dev, unsigned int reg)
{
	return reg == WM8731_RESET;
}

#define wm8731_reset(m)	regmap_write(m, WM8731_RESET, 0)

static const char *wm8731_input_select[] = {"Line In", "Mic"};

static SOC_ENUM_SINGLE_DECL(wm8731_insel_enum,
			    WM8731_APANA, 2, wm8731_input_select);

static int wm8731_deemph[] = { 0, 32000, 44100, 48000 };

static int wm8731_set_deemph(struct snd_soc_codec *codec)
{
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
	int val, i, best;

	/* If we're using deemphasis select the nearest available sample
	 * rate.
	 */
	if (wm8731->deemph) {
		best = 1;
		for (i = 2; i < ARRAY_SIZE(wm8731_deemph); i++) {
			if (abs(wm8731_deemph[i] - wm8731->playback_fs) <
			    abs(wm8731_deemph[best] - wm8731->playback_fs))
				best = i;
		}

		val = best << 1;
	} else {
		best = 0;
		val = 0;
	}

	dev_dbg(codec->dev, "Set deemphasis %d (%dHz)\n",
		best, wm8731_deemph[best]);

	return snd_soc_update_bits(codec, WM8731_APDIGI, 0x6, val);
}

static int wm8731_get_deemph(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);

	ucontrol->value.integer.value[0] = wm8731->deemph;

	return 0;
}

static int wm8731_put_deemph(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
	unsigned int deemph = ucontrol->value.integer.value[0];
	int ret = 0;

	if (deemph > 1)
		return -EINVAL;

	mutex_lock(&wm8731->lock);
	if (wm8731->deemph != deemph) {
		wm8731->deemph = deemph;

		wm8731_set_deemph(codec);

		ret = 1;
	}
	mutex_unlock(&wm8731->lock);

	return ret;
}

static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
static const DECLARE_TLV_DB_SCALE(mic_tlv, 0, 2000, 0);

static const struct snd_kcontrol_new wm8731_snd_controls[] = {

SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
		 0, 127, 0, out_tlv),
SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
	7, 1, 0),

SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
		 in_tlv),
SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),

SOC_SINGLE_TLV("Mic Boost Volume", WM8731_APANA, 0, 1, 0, mic_tlv),
SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),

SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
	       sidetone_tlv),

SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),

SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0,
		    wm8731_get_deemph, wm8731_put_deemph),
};

/* Output Mixer */
static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
};

/* Input mux */
static const struct snd_kcontrol_new wm8731_input_mux_controls =
SOC_DAPM_ENUM("Input Select", wm8731_insel_enum);

static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
SND_SOC_DAPM_SUPPLY("ACTIVE",WM8731_ACTIVE, 0, 0, NULL, 0),
SND_SOC_DAPM_SUPPLY("OSC", WM8731_PWR, 5, 1, NULL, 0),
SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
	&wm8731_output_mixer_controls[0],
	ARRAY_SIZE(wm8731_output_mixer_controls)),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
SND_SOC_DAPM_OUTPUT("LOUT"),
SND_SOC_DAPM_OUTPUT("LHPOUT"),
SND_SOC_DAPM_OUTPUT("ROUT"),
SND_SOC_DAPM_OUTPUT("RHPOUT"),
SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
SND_SOC_DAPM_INPUT("MICIN"),
SND_SOC_DAPM_INPUT("RLINEIN"),
SND_SOC_DAPM_INPUT("LLINEIN"),
};

static int wm8731_check_osc(struct snd_soc_dapm_widget *source,
			    struct snd_soc_dapm_widget *sink)
{
	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(source->dapm);
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);

	return wm8731->sysclk_type == WM8731_SYSCLK_XTAL;
}

static const struct snd_soc_dapm_route wm8731_intercon[] = {
	{"DAC", NULL, "OSC", wm8731_check_osc},
	{"ADC", NULL, "OSC", wm8731_check_osc},
	{"DAC", NULL, "ACTIVE"},
	{"ADC", NULL, "ACTIVE"},

	/* output mixer */
	{"Output Mixer", "Line Bypass Switch", "Line Input"},
	{"Output Mixer", "HiFi Playback Switch", "DAC"},
	{"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},

	/* outputs */
	{"RHPOUT", NULL, "Output Mixer"},
	{"ROUT", NULL, "Output Mixer"},
	{"LHPOUT", NULL, "Output Mixer"},
	{"LOUT", NULL, "Output Mixer"},

	/* input mux */
	{"Input Mux", "Line In", "Line Input"},
	{"Input Mux", "Mic", "Mic Bias"},
	{"ADC", NULL, "Input Mux"},

	/* inputs */
	{"Line Input", NULL, "LLINEIN"},
	{"Line Input", NULL, "RLINEIN"},
	{"Mic Bias", NULL, "MICIN"},
};

struct _coeff_div {
	u32 mclk;
	u32 rate;
	u16 fs;
	u8 sr:4;
	u8 bosr:1;
	u8 usb:1;
};

/* codec mclk clock divider coefficients */
static const struct _coeff_div coeff_div[] = {
	/* 48k */
	{12288000, 48000, 256, 0x0, 0x0, 0x0},
	{18432000, 48000, 384, 0x0, 0x1, 0x0},
	{12000000, 48000, 250, 0x0, 0x0, 0x1},

	/* 32k */
	{12288000, 32000, 384, 0x6, 0x0, 0x0},
	{18432000, 32000, 576, 0x6, 0x1, 0x0},
	{12000000, 32000, 375, 0x6, 0x0, 0x1},

	/* 8k */
	{12288000, 8000, 1536, 0x3, 0x0, 0x0},
	{18432000, 8000, 2304, 0x3, 0x1, 0x0},
	{11289600, 8000, 1408, 0xb, 0x0, 0x0},
	{16934400, 8000, 2112, 0xb, 0x1, 0x0},
	{12000000, 8000, 1500, 0x3, 0x0, 0x1},

	/* 96k */
	{12288000, 96000, 128, 0x7, 0x0, 0x0},
	{18432000, 96000, 192, 0x7, 0x1, 0x0},
	{12000000, 96000, 125, 0x7, 0x0, 0x1},

	/* 44.1k */
	{11289600, 44100, 256, 0x8, 0x0, 0x0},
	{16934400, 44100, 384, 0x8, 0x1, 0x0},
	{12000000, 44100, 272, 0x8, 0x1, 0x1},

	/* 88.2k */
	{11289600, 88200, 128, 0xf, 0x0, 0x0},
	{16934400, 88200, 192, 0xf, 0x1, 0x0},
	{12000000, 88200, 136, 0xf, 0x1, 0x1},
};

/* rates constraints */
static const unsigned int wm8731_rates_12000000[] = {
	8000, 32000, 44100, 48000, 96000, 88200,
};

static const unsigned int wm8731_rates_12288000_18432000[] = {
	8000, 32000, 48000, 96000,
};

static const unsigned int wm8731_rates_11289600_16934400[] = {
	8000, 44100, 88200,
};

static const struct snd_pcm_hw_constraint_list wm8731_constraints_12000000 = {
	.list = wm8731_rates_12000000,
	.count = ARRAY_SIZE(wm8731_rates_12000000),
};

static const
struct snd_pcm_hw_constraint_list wm8731_constraints_12288000_18432000 = {
	.list = wm8731_rates_12288000_18432000,
	.count = ARRAY_SIZE(wm8731_rates_12288000_18432000),
};

static const
struct snd_pcm_hw_constraint_list wm8731_constraints_11289600_16934400 = {
	.list = wm8731_rates_11289600_16934400,
	.count = ARRAY_SIZE(wm8731_rates_11289600_16934400),
};

static inline int get_coeff(int mclk, int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
		if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
			return i;
	}
	return 0;
}

static int wm8731_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
	u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
	int i = get_coeff(wm8731->sysclk, params_rate(params));
	u16 srate = (coeff_div[i].sr << 2) |
		(coeff_div[i].bosr << 1) | coeff_div[i].usb;

	wm8731->playback_fs = params_rate(params);

	snd_soc_write(codec, WM8731_SRATE, srate);

	/* bit size */
	switch (params_width(params)) {
	case 16:
		break;
	case 20:
		iface |= 0x0004;
		break;
	case 24:
		iface |= 0x0008;
		break;
	case 32:
		iface |= 0x000c;
		break;
	}

	wm8731_set_deemph(codec);

	snd_soc_write(codec, WM8731_IFACE, iface);
	return 0;
}

static int wm8731_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;

	if (mute)
		snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
	else
		snd_soc_write(codec, WM8731_APDIGI, mute_reg);
	return 0;
}

static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
		int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);

	switch (clk_id) {
	case WM8731_SYSCLK_XTAL:
	case WM8731_SYSCLK_MCLK:
		if (wm8731->mclk && clk_set_rate(wm8731->mclk, freq))
			return -EINVAL;
		wm8731->sysclk_type = clk_id;
		break;
	default:
		return -EINVAL;
	}

	switch (freq) {
	case 0:
		wm8731->constraints = NULL;
		break;
	case 12000000:
		wm8731->constraints = &wm8731_constraints_12000000;
		break;
	case 12288000:
	case 18432000:
		wm8731->constraints = &wm8731_constraints_12288000_18432000;
		break;
	case 16934400:
	case 11289600:
		wm8731->constraints = &wm8731_constraints_11289600_16934400;
		break;
	default:
		return -EINVAL;
	}

	wm8731->sysclk = freq;

	snd_soc_dapm_sync(dapm);

	return 0;
}


static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = 0;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		iface |= 0x0040;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		return -EINVAL;
	}

	/* interface format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		iface |= 0x0002;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		iface |= 0x0001;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		iface |= 0x0013;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		iface |= 0x0003;
		break;
	default:
		return -EINVAL;
	}

	/* clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	case SND_SOC_DAIFMT_IB_IF:
		iface |= 0x0090;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		iface |= 0x0080;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		iface |= 0x0010;
		break;
	default:
		return -EINVAL;
	}

	/* set iface */
	snd_soc_write(codec, WM8731_IFACE, iface);
	return 0;
}

static int wm8731_set_bias_level(struct snd_soc_codec *codec,
				 enum snd_soc_bias_level level)
{
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
	int ret;
	u16 reg;

	switch (level) {
	case SND_SOC_BIAS_ON:
		if (wm8731->mclk) {
			ret = clk_prepare_enable(wm8731->mclk);
			if (ret)
				return ret;
		}
		break;
	case SND_SOC_BIAS_PREPARE:
		break;
	case SND_SOC_BIAS_STANDBY:
		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
			ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
						    wm8731->supplies);
			if (ret != 0)
				return ret;

			regcache_sync(wm8731->regmap);
		}

		/* Clear PWROFF, gate CLKOUT, everything else as-is */
		reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
		snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
		break;
	case SND_SOC_BIAS_OFF:
		if (wm8731->mclk)
			clk_disable_unprepare(wm8731->mclk);
		snd_soc_write(codec, WM8731_PWR, 0xffff);
		regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
				       wm8731->supplies);
		regcache_mark_dirty(wm8731->regmap);
		break;
	}
	return 0;
}

static int wm8731_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
{
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(dai->codec);

	if (wm8731->constraints)
		snd_pcm_hw_constraint_list(substream->runtime, 0,
					   SNDRV_PCM_HW_PARAM_RATE,
					   wm8731->constraints);

	return 0;
}

#define WM8731_RATES SNDRV_PCM_RATE_8000_96000

#define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
	SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops wm8731_dai_ops = {
	.startup	= wm8731_startup,
	.hw_params	= wm8731_hw_params,
	.digital_mute	= wm8731_mute,
	.set_sysclk	= wm8731_set_dai_sysclk,
	.set_fmt	= wm8731_set_dai_fmt,
};

static struct snd_soc_dai_driver wm8731_dai = {
	.name = "wm8731-hifi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8731_RATES,
		.formats = WM8731_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8731_RATES,
		.formats = WM8731_FORMATS,},
	.ops = &wm8731_dai_ops,
	.symmetric_rates = 1,
};

static int wm8731_request_supplies(struct device *dev,
		struct wm8731_priv *wm8731)
{
	int ret = 0, i;

	for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
		wm8731->supplies[i].supply = wm8731_supply_names[i];

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(wm8731->supplies),
				 wm8731->supplies);
	if (ret != 0) {
		dev_err(dev, "Failed to request supplies: %d\n", ret);
		return ret;
	}

	ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
				    wm8731->supplies);
	if (ret != 0) {
		dev_err(dev, "Failed to enable supplies: %d\n", ret);
		return ret;
	}

	return 0;
}

static int wm8731_hw_init(struct device *dev, struct wm8731_priv *wm8731)
{
	int ret = 0;

	ret = wm8731_reset(wm8731->regmap);
	if (ret < 0) {
		dev_err(dev, "Failed to issue reset: %d\n", ret);
		goto err_regulator_enable;
	}

	/* Clear POWEROFF, keep everything else disabled */
	regmap_write(wm8731->regmap, WM8731_PWR, 0x7f);

	/* Latch the update bits */
	regmap_update_bits(wm8731->regmap, WM8731_LOUT1V, 0x100, 0);
	regmap_update_bits(wm8731->regmap, WM8731_ROUT1V, 0x100, 0);
	regmap_update_bits(wm8731->regmap, WM8731_LINVOL, 0x100, 0);
	regmap_update_bits(wm8731->regmap, WM8731_RINVOL, 0x100, 0);

	/* Disable bypass path by default */
	regmap_update_bits(wm8731->regmap, WM8731_APANA, 0x8, 0);

	regcache_mark_dirty(wm8731->regmap);

err_regulator_enable:
	/* Regulators will be enabled by bias management */
	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);

	return ret;
}

static const struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
	.set_bias_level = wm8731_set_bias_level,
	.suspend_bias_off = true,

	.component_driver = {
		.controls		= wm8731_snd_controls,
		.num_controls		= ARRAY_SIZE(wm8731_snd_controls),
		.dapm_widgets		= wm8731_dapm_widgets,
		.num_dapm_widgets	= ARRAY_SIZE(wm8731_dapm_widgets),
		.dapm_routes		= wm8731_intercon,
		.num_dapm_routes	= ARRAY_SIZE(wm8731_intercon),
	},
};

static const struct of_device_id wm8731_of_match[] = {
	{ .compatible = "wlf,wm8731", },
	{ }
};

MODULE_DEVICE_TABLE(of, wm8731_of_match);

static const struct regmap_config wm8731_regmap = {
	.reg_bits = 7,
	.val_bits = 9,

	.max_register = WM8731_RESET,
	.volatile_reg = wm8731_volatile,

	.cache_type = REGCACHE_RBTREE,
	.reg_defaults = wm8731_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(wm8731_reg_defaults),
};

#if defined(CONFIG_SPI_MASTER)
static int wm8731_spi_probe(struct spi_device *spi)
{
	struct wm8731_priv *wm8731;
	int ret;

	wm8731 = devm_kzalloc(&spi->dev, sizeof(*wm8731), GFP_KERNEL);
	if (wm8731 == NULL)
		return -ENOMEM;

	wm8731->mclk = devm_clk_get(&spi->dev, "mclk");
	if (IS_ERR(wm8731->mclk)) {
		ret = PTR_ERR(wm8731->mclk);
		if (ret == -ENOENT) {
			wm8731->mclk = NULL;
			dev_warn(&spi->dev, "Assuming static MCLK\n");
		} else {
			dev_err(&spi->dev, "Failed to get MCLK: %d\n",
				ret);
			return ret;
		}
	}

	mutex_init(&wm8731->lock);

	spi_set_drvdata(spi, wm8731);

	ret = wm8731_request_supplies(&spi->dev, wm8731);
	if (ret != 0)
		return ret;

	wm8731->regmap = devm_regmap_init_spi(spi, &wm8731_regmap);
	if (IS_ERR(wm8731->regmap)) {
		ret = PTR_ERR(wm8731->regmap);
		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	ret = wm8731_hw_init(&spi->dev, wm8731);
	if (ret != 0)
		return ret;

	ret = snd_soc_register_codec(&spi->dev,
			&soc_codec_dev_wm8731, &wm8731_dai, 1);
	if (ret != 0) {
		dev_err(&spi->dev, "Failed to register CODEC: %d\n", ret);
		return ret;
	}

	return 0;
}

static int wm8731_spi_remove(struct spi_device *spi)
{
	snd_soc_unregister_codec(&spi->dev);
	return 0;
}

static struct spi_driver wm8731_spi_driver = {
	.driver = {
		.name	= "wm8731",
		.of_match_table = wm8731_of_match,
	},
	.probe		= wm8731_spi_probe,
	.remove		= wm8731_spi_remove,
};
#endif /* CONFIG_SPI_MASTER */

#if IS_ENABLED(CONFIG_I2C)
static int wm8731_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct wm8731_priv *wm8731;
	int ret;

	wm8731 = devm_kzalloc(&i2c->dev, sizeof(struct wm8731_priv),
			      GFP_KERNEL);
	if (wm8731 == NULL)
		return -ENOMEM;

	wm8731->mclk = devm_clk_get(&i2c->dev, "mclk");
	if (IS_ERR(wm8731->mclk)) {
		ret = PTR_ERR(wm8731->mclk);
		if (ret == -ENOENT) {
			wm8731->mclk = NULL;
			dev_warn(&i2c->dev, "Assuming static MCLK\n");
		} else {
			dev_err(&i2c->dev, "Failed to get MCLK: %d\n",
				ret);
			return ret;
		}
	}

	mutex_init(&wm8731->lock);

	i2c_set_clientdata(i2c, wm8731);

	ret = wm8731_request_supplies(&i2c->dev, wm8731);
	if (ret != 0)
		return ret;

	wm8731->regmap = devm_regmap_init_i2c(i2c, &wm8731_regmap);
	if (IS_ERR(wm8731->regmap)) {
		ret = PTR_ERR(wm8731->regmap);
		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	ret = wm8731_hw_init(&i2c->dev, wm8731);
	if (ret != 0)
		return ret;

	ret = snd_soc_register_codec(&i2c->dev,
			&soc_codec_dev_wm8731, &wm8731_dai, 1);
	if (ret != 0) {
		dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
		return ret;
	}

	return 0;
}

static int wm8731_i2c_remove(struct i2c_client *client)
{
	snd_soc_unregister_codec(&client->dev);
	return 0;
}

static const struct i2c_device_id wm8731_i2c_id[] = {
	{ "wm8731", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);

static struct i2c_driver wm8731_i2c_driver = {
	.driver = {
		.name = "wm8731",
		.of_match_table = wm8731_of_match,
	},
	.probe =    wm8731_i2c_probe,
	.remove =   wm8731_i2c_remove,
	.id_table = wm8731_i2c_id,
};
#endif

static int __init wm8731_modinit(void)
{
	int ret = 0;
#if IS_ENABLED(CONFIG_I2C)
	ret = i2c_add_driver(&wm8731_i2c_driver);
	if (ret != 0) {
		printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
		       ret);
	}
#endif
#if defined(CONFIG_SPI_MASTER)
	ret = spi_register_driver(&wm8731_spi_driver);
	if (ret != 0) {
		printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
		       ret);
	}
#endif
	return ret;
}
module_init(wm8731_modinit);

static void __exit wm8731_exit(void)
{
#if IS_ENABLED(CONFIG_I2C)
	i2c_del_driver(&wm8731_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
	spi_unregister_driver(&wm8731_spi_driver);
#endif
}
module_exit(wm8731_exit);

MODULE_DESCRIPTION("ASoC WM8731 driver");
MODULE_AUTHOR("Richard Purdie");
MODULE_LICENSE("GPL");