aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/wm8974.c
blob: 1468fe10cbbe54d57ce5d072b5406261487d2bc8 (plain) (blame)
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
/*
 * wm8974.c  --  WM8974 ALSA Soc Audio driver
 *
 * Copyright 2006-2009 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood <linux@wolfsonmicro.com>
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "wm8974.h"

static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0050, 0x0000, 0x0140, 0x0000,
	0x0000, 0x0000, 0x0000, 0x00ff,
	0x0000, 0x0000, 0x0100, 0x00ff,
	0x0000, 0x0000, 0x012c, 0x002c,
	0x002c, 0x002c, 0x002c, 0x0000,
	0x0032, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0038, 0x000b, 0x0032, 0x0000,
	0x0008, 0x000c, 0x0093, 0x00e9,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0003, 0x0010, 0x0000, 0x0000,
	0x0000, 0x0002, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0039, 0x0000,
	0x0000,
};

#define WM8974_POWER1_BIASEN  0x08
#define WM8974_POWER1_BUFIOEN 0x04

struct wm8974_priv {
	struct snd_soc_codec codec;
	u16 reg_cache[WM8974_CACHEREGNUM];
};

static struct snd_soc_codec *wm8974_codec;

#define wm8974_reset(c)	snd_soc_write(c, WM8974_RESET, 0)

static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
static const char *wm8974_eqmode[] = {"Capture", "Playback" };
static const char *wm8974_bw[] = {"Narrow", "Wide" };
static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
static const char *wm8974_alc[] = {"ALC", "Limiter" };

static const struct soc_enum wm8974_enum[] = {
	SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
	SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
	SOC_ENUM_SINGLE(WM8974_DAC,  4, 4, wm8974_deemp),
	SOC_ENUM_SINGLE(WM8974_EQ1,  8, 2, wm8974_eqmode),

	SOC_ENUM_SINGLE(WM8974_EQ1,  5, 4, wm8974_eq1),
	SOC_ENUM_SINGLE(WM8974_EQ2,  8, 2, wm8974_bw),
	SOC_ENUM_SINGLE(WM8974_EQ2,  5, 4, wm8974_eq2),
	SOC_ENUM_SINGLE(WM8974_EQ3,  8, 2, wm8974_bw),

	SOC_ENUM_SINGLE(WM8974_EQ3,  5, 4, wm8974_eq3),
	SOC_ENUM_SINGLE(WM8974_EQ4,  8, 2, wm8974_bw),
	SOC_ENUM_SINGLE(WM8974_EQ4,  5, 4, wm8974_eq4),
	SOC_ENUM_SINGLE(WM8974_EQ5,  8, 2, wm8974_bw),

	SOC_ENUM_SINGLE(WM8974_EQ5,  5, 4, wm8974_eq5),
	SOC_ENUM_SINGLE(WM8974_ALC3,  8, 2, wm8974_alc),
};

static const char *wm8974_auxmode_text[] = { "Buffer", "Mixer" };

static const struct soc_enum wm8974_auxmode =
	SOC_ENUM_SINGLE(WM8974_INPUT,  3, 2, wm8974_auxmode_text);

static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);

static const struct snd_kcontrol_new wm8974_snd_controls[] = {

SOC_SINGLE("Digital Loopback Switch", WM8974_COMP, 0, 1, 0),

SOC_ENUM("DAC Companding", wm8974_enum[1]),
SOC_ENUM("ADC Companding", wm8974_enum[0]),

SOC_ENUM("Playback De-emphasis", wm8974_enum[2]),
SOC_SINGLE("DAC Inversion Switch", WM8974_DAC, 0, 1, 0),

SOC_SINGLE_TLV("PCM Volume", WM8974_DACVOL, 0, 255, 0, digital_tlv),

SOC_SINGLE("High Pass Filter Switch", WM8974_ADC, 8, 1, 0),
SOC_SINGLE("High Pass Cut Off", WM8974_ADC, 4, 7, 0),
SOC_SINGLE("ADC Inversion Switch", WM8974_ADC, 0, 1, 0),

SOC_SINGLE_TLV("Capture Volume", WM8974_ADCVOL,  0, 255, 0, digital_tlv),

SOC_ENUM("Equaliser Function", wm8974_enum[3]),
SOC_ENUM("EQ1 Cut Off", wm8974_enum[4]),
SOC_SINGLE_TLV("EQ1 Volume", WM8974_EQ1,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ2 Bandwith", wm8974_enum[5]),
SOC_ENUM("EQ2 Cut Off", wm8974_enum[6]),
SOC_SINGLE_TLV("EQ2 Volume", WM8974_EQ2,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ3 Bandwith", wm8974_enum[7]),
SOC_ENUM("EQ3 Cut Off", wm8974_enum[8]),
SOC_SINGLE_TLV("EQ3 Volume", WM8974_EQ3,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ4 Bandwith", wm8974_enum[9]),
SOC_ENUM("EQ4 Cut Off", wm8974_enum[10]),
SOC_SINGLE_TLV("EQ4 Volume", WM8974_EQ4,  0, 24, 1, eq_tlv),

SOC_ENUM("Equaliser EQ5 Bandwith", wm8974_enum[11]),
SOC_ENUM("EQ5 Cut Off", wm8974_enum[12]),
SOC_SINGLE_TLV("EQ5 Volume", WM8974_EQ5,  0, 24, 1, eq_tlv),

SOC_SINGLE("DAC Playback Limiter Switch", WM8974_DACLIM1,  8, 1, 0),
SOC_SINGLE("DAC Playback Limiter Decay", WM8974_DACLIM1,  4, 15, 0),
SOC_SINGLE("DAC Playback Limiter Attack", WM8974_DACLIM1,  0, 15, 0),

SOC_SINGLE("DAC Playback Limiter Threshold", WM8974_DACLIM2,  4, 7, 0),
SOC_SINGLE("DAC Playback Limiter Boost", WM8974_DACLIM2,  0, 15, 0),

SOC_SINGLE("ALC Enable Switch", WM8974_ALC1,  8, 1, 0),
SOC_SINGLE("ALC Capture Max Gain", WM8974_ALC1,  3, 7, 0),
SOC_SINGLE("ALC Capture Min Gain", WM8974_ALC1,  0, 7, 0),

SOC_SINGLE("ALC Capture ZC Switch", WM8974_ALC2,  8, 1, 0),
SOC_SINGLE("ALC Capture Hold", WM8974_ALC2,  4, 7, 0),
SOC_SINGLE("ALC Capture Target", WM8974_ALC2,  0, 15, 0),

SOC_ENUM("ALC Capture Mode", wm8974_enum[13]),
SOC_SINGLE("ALC Capture Decay", WM8974_ALC3,  4, 15, 0),
SOC_SINGLE("ALC Capture Attack", WM8974_ALC3,  0, 15, 0),

SOC_SINGLE("ALC Capture Noise Gate Switch", WM8974_NGATE,  3, 1, 0),
SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8974_NGATE,  0, 7, 0),

SOC_SINGLE("Capture PGA ZC Switch", WM8974_INPPGA,  7, 1, 0),
SOC_SINGLE_TLV("Capture PGA Volume", WM8974_INPPGA,  0, 63, 0, inpga_tlv),

SOC_SINGLE("Speaker Playback ZC Switch", WM8974_SPKVOL,  7, 1, 0),
SOC_SINGLE("Speaker Playback Switch", WM8974_SPKVOL,  6, 1, 1),
SOC_SINGLE_TLV("Speaker Playback Volume", WM8974_SPKVOL,  0, 63, 0, spk_tlv),

SOC_ENUM("Aux Mode", wm8974_auxmode),

SOC_SINGLE("Capture Boost(+20dB)", WM8974_ADCBOOST,  8, 1, 0),
SOC_SINGLE("Mono Playback Switch", WM8974_MONOMIX, 6, 1, 1),

/* DAC / ADC oversampling */
SOC_SINGLE("DAC 128x Oversampling Switch", WM8974_DAC, 8, 1, 0),
SOC_SINGLE("ADC 128x Oversampling Switch", WM8974_ADC, 8, 1, 0),
};

/* Speaker Output Mixer */
static const struct snd_kcontrol_new wm8974_speaker_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_SPKMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_SPKMIX, 5, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_SPKMIX, 0, 1, 0),
};

/* Mono Output Mixer */
static const struct snd_kcontrol_new wm8974_mono_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_MONOMIX, 1, 1, 0),
SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_MONOMIX, 2, 1, 0),
SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_MONOMIX, 0, 1, 0),
};

/* Boost mixer */
static const struct snd_kcontrol_new wm8974_boost_mixer[] = {
SOC_DAPM_SINGLE("Aux Switch", WM8974_INPPGA, 6, 1, 0),
};

/* Input PGA */
static const struct snd_kcontrol_new wm8974_inpga[] = {
SOC_DAPM_SINGLE("Aux Switch", WM8974_INPUT, 2, 1, 0),
SOC_DAPM_SINGLE("MicN Switch", WM8974_INPUT, 1, 1, 0),
SOC_DAPM_SINGLE("MicP Switch", WM8974_INPUT, 0, 1, 0),
};

/* AUX Input boost vol */
static const struct snd_kcontrol_new wm8974_aux_boost_controls =
SOC_DAPM_SINGLE("Aux Volume", WM8974_ADCBOOST, 0, 7, 0);

/* Mic Input boost vol */
static const struct snd_kcontrol_new wm8974_mic_boost_controls =
SOC_DAPM_SINGLE("Mic Volume", WM8974_ADCBOOST, 4, 7, 0);

static const struct snd_soc_dapm_widget wm8974_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Speaker Mixer", WM8974_POWER3, 2, 0,
	&wm8974_speaker_mixer_controls[0],
	ARRAY_SIZE(wm8974_speaker_mixer_controls)),
SND_SOC_DAPM_MIXER("Mono Mixer", WM8974_POWER3, 3, 0,
	&wm8974_mono_mixer_controls[0],
	ARRAY_SIZE(wm8974_mono_mixer_controls)),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8974_POWER3, 0, 0),
SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8974_POWER2, 0, 0),
SND_SOC_DAPM_PGA("Aux Input", WM8974_POWER1, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("SpkN Out", WM8974_POWER3, 5, 0, NULL, 0),
SND_SOC_DAPM_PGA("SpkP Out", WM8974_POWER3, 6, 0, NULL, 0),
SND_SOC_DAPM_PGA("Mono Out", WM8974_POWER3, 7, 0, NULL, 0),

SND_SOC_DAPM_MIXER("Input PGA", WM8974_POWER2, 2, 0, wm8974_inpga,
		   ARRAY_SIZE(wm8974_inpga)),
SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0,
		   wm8974_boost_mixer, ARRAY_SIZE(wm8974_boost_mixer)),

SND_SOC_DAPM_MICBIAS("Mic Bias", WM8974_POWER1, 4, 0),

SND_SOC_DAPM_INPUT("MICN"),
SND_SOC_DAPM_INPUT("MICP"),
SND_SOC_DAPM_INPUT("AUX"),
SND_SOC_DAPM_OUTPUT("MONOOUT"),
SND_SOC_DAPM_OUTPUT("SPKOUTP"),
SND_SOC_DAPM_OUTPUT("SPKOUTN"),
};

static const struct snd_soc_dapm_route audio_map[] = {
	/* Mono output mixer */
	{"Mono Mixer", "PCM Playback Switch", "DAC"},
	{"Mono Mixer", "Aux Playback Switch", "Aux Input"},
	{"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},

	/* Speaker output mixer */
	{"Speaker Mixer", "PCM Playback Switch", "DAC"},
	{"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
	{"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},

	/* Outputs */
	{"Mono Out", NULL, "Mono Mixer"},
	{"MONOOUT", NULL, "Mono Out"},
	{"SpkN Out", NULL, "Speaker Mixer"},
	{"SpkP Out", NULL, "Speaker Mixer"},
	{"SPKOUTN", NULL, "SpkN Out"},
	{"SPKOUTP", NULL, "SpkP Out"},

	/* Boost Mixer */
	{"ADC", NULL, "Boost Mixer"},
	{"Boost Mixer", "Aux Switch", "Aux Input"},
	{"Boost Mixer", NULL, "Input PGA"},
	{"Boost Mixer", NULL, "MICP"},

	/* Input PGA */
	{"Input PGA", "Aux Switch", "Aux Input"},
	{"Input PGA", "MicN Switch", "MICN"},
	{"Input PGA", "MicP Switch", "MICP"},

	/* Inputs */
	{"Aux Input", NULL, "AUX"},
};

static int wm8974_add_widgets(struct snd_soc_codec *codec)
{
	snd_soc_dapm_new_controls(codec, wm8974_dapm_widgets,
				  ARRAY_SIZE(wm8974_dapm_widgets));

	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

	return 0;
}

struct pll_ {
	unsigned int pre_div:1;
	unsigned int n:4;
	unsigned int k;
};

/* The size in bits of the pll divide multiplied by 10
 * to allow rounding later */
#define FIXED_PLL_SIZE ((1 << 24) * 10)

static void pll_factors(struct pll_ *pll_div,
			unsigned int target, unsigned int source)
{
	unsigned long long Kpart;
	unsigned int K, Ndiv, Nmod;

	/* There is a fixed divide by 4 in the output path */
	target *= 4;

	Ndiv = target / source;
	if (Ndiv < 6) {
		source /= 2;
		pll_div->pre_div = 1;
		Ndiv = target / source;
	} else
		pll_div->pre_div = 0;

	if ((Ndiv < 6) || (Ndiv > 12))
		printk(KERN_WARNING
			"WM8974 N value %u outwith recommended range!\n",
			Ndiv);

	pll_div->n = Ndiv;
	Nmod = target % source;
	Kpart = FIXED_PLL_SIZE * (long long)Nmod;

	do_div(Kpart, source);

	K = Kpart & 0xFFFFFFFF;

	/* Check if we need to round */
	if ((K % 10) >= 5)
		K += 5;

	/* Move down to proper range now rounding is done */
	K /= 10;

	pll_div->k = K;
}

static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
		int source, unsigned int freq_in, unsigned int freq_out)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct pll_ pll_div;
	u16 reg;

	if (freq_in == 0 || freq_out == 0) {
		/* Clock CODEC directly from MCLK */
		reg = snd_soc_read(codec, WM8974_CLOCK);
		snd_soc_write(codec, WM8974_CLOCK, reg & 0x0ff);

		/* Turn off PLL */
		reg = snd_soc_read(codec, WM8974_POWER1);
		snd_soc_write(codec, WM8974_POWER1, reg & 0x1df);
		return 0;
	}

	pll_factors(&pll_div, freq_out, freq_in);

	snd_soc_write(codec, WM8974_PLLN, (pll_div.pre_div << 4) | pll_div.n);
	snd_soc_write(codec, WM8974_PLLK1, pll_div.k >> 18);
	snd_soc_write(codec, WM8974_PLLK2, (pll_div.k >> 9) & 0x1ff);
	snd_soc_write(codec, WM8974_PLLK3, pll_div.k & 0x1ff);
	reg = snd_soc_read(codec, WM8974_POWER1);
	snd_soc_write(codec, WM8974_POWER1, reg | 0x020);

	/* Run CODEC from PLL instead of MCLK */
	reg = snd_soc_read(codec, WM8974_CLOCK);
	snd_soc_write(codec, WM8974_CLOCK, reg | 0x100);

	return 0;
}

/*
 * Configure WM8974 clock dividers.
 */
static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
		int div_id, int div)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 reg;

	switch (div_id) {
	case WM8974_OPCLKDIV:
		reg = snd_soc_read(codec, WM8974_GPIO) & 0x1cf;
		snd_soc_write(codec, WM8974_GPIO, reg | div);
		break;
	case WM8974_MCLKDIV:
		reg = snd_soc_read(codec, WM8974_CLOCK) & 0x11f;
		snd_soc_write(codec, WM8974_CLOCK, reg | div);
		break;
	case WM8974_BCLKDIV:
		reg = snd_soc_read(codec, WM8974_CLOCK) & 0x1e3;
		snd_soc_write(codec, WM8974_CLOCK, reg | div);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = 0;
	u16 clk = snd_soc_read(codec, WM8974_CLOCK) & 0x1fe;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		clk |= 0x0001;
		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 |= 0x0010;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		iface |= 0x0008;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		iface |= 0x00018;
		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 |= 0x0180;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		iface |= 0x0100;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		iface |= 0x0080;
		break;
	default:
		return -EINVAL;
	}

	snd_soc_write(codec, WM8974_IFACE, iface);
	snd_soc_write(codec, WM8974_CLOCK, clk);
	return 0;
}

static int wm8974_pcm_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;
	u16 iface = snd_soc_read(codec, WM8974_IFACE) & 0x19f;
	u16 adn = snd_soc_read(codec, WM8974_ADD) & 0x1f1;

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		iface |= 0x0020;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iface |= 0x0040;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		iface |= 0x0060;
		break;
	}

	/* filter coefficient */
	switch (params_rate(params)) {
	case 8000:
		adn |= 0x5 << 1;
		break;
	case 11025:
		adn |= 0x4 << 1;
		break;
	case 16000:
		adn |= 0x3 << 1;
		break;
	case 22050:
		adn |= 0x2 << 1;
		break;
	case 32000:
		adn |= 0x1 << 1;
		break;
	case 44100:
	case 48000:
		break;
	}

	snd_soc_write(codec, WM8974_IFACE, iface);
	snd_soc_write(codec, WM8974_ADD, adn);
	return 0;
}

static int wm8974_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = snd_soc_read(codec, WM8974_DAC) & 0xffbf;

	if (mute)
		snd_soc_write(codec, WM8974_DAC, mute_reg | 0x40);
	else
		snd_soc_write(codec, WM8974_DAC, mute_reg);
	return 0;
}

/* liam need to make this lower power with dapm */
static int wm8974_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
{
	u16 power1 = snd_soc_read(codec, WM8974_POWER1) & ~0x3;

	switch (level) {
	case SND_SOC_BIAS_ON:
	case SND_SOC_BIAS_PREPARE:
		power1 |= 0x1;  /* VMID 50k */
		snd_soc_write(codec, WM8974_POWER1, power1);
		break;

	case SND_SOC_BIAS_STANDBY:
		power1 |= WM8974_POWER1_BIASEN | WM8974_POWER1_BUFIOEN;

		if (codec->bias_level == SND_SOC_BIAS_OFF) {
			/* Initial cap charge at VMID 5k */
			snd_soc_write(codec, WM8974_POWER1, power1 | 0x3);
			mdelay(100);
		}

		power1 |= 0x2;  /* VMID 500k */
		snd_soc_write(codec, WM8974_POWER1, power1);
		break;

	case SND_SOC_BIAS_OFF:
		snd_soc_write(codec, WM8974_POWER1, 0);
		snd_soc_write(codec, WM8974_POWER2, 0);
		snd_soc_write(codec, WM8974_POWER3, 0);
		break;
	}

	codec->bias_level = level;
	return 0;
}

#define WM8974_RATES (SNDRV_PCM_RATE_8000_48000)

#define WM8974_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
	SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_ops wm8974_ops = {
	.hw_params = wm8974_pcm_hw_params,
	.digital_mute = wm8974_mute,
	.set_fmt = wm8974_set_dai_fmt,
	.set_clkdiv = wm8974_set_dai_clkdiv,
	.set_pll = wm8974_set_dai_pll,
};

struct snd_soc_dai wm8974_dai = {
	.name = "WM8974 HiFi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,   /* Only 1 channel of data */
		.rates = WM8974_RATES,
		.formats = WM8974_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,   /* Only 1 channel of data */
		.rates = WM8974_RATES,
		.formats = WM8974_FORMATS,},
	.ops = &wm8974_ops,
	.symmetric_rates = 1,
};
EXPORT_SYMBOL_GPL(wm8974_dai);

static int wm8974_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
}

static int wm8974_resume(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;
	int i;
	u8 data[2];
	u16 *cache = codec->reg_cache;

	/* Sync reg_cache with the hardware */
	for (i = 0; i < ARRAY_SIZE(wm8974_reg); i++) {
		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
		data[1] = cache[i] & 0x00ff;
		codec->hw_write(codec->control_data, data, 2);
	}
	wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
}

static int wm8974_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret = 0;

	if (wm8974_codec == NULL) {
		dev_err(&pdev->dev, "Codec device not registered\n");
		return -ENODEV;
	}

	socdev->card->codec = wm8974_codec;
	codec = wm8974_codec;

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		dev_err(codec->dev, "failed to create pcms: %d\n", ret);
		goto pcm_err;
	}

	snd_soc_add_controls(codec, wm8974_snd_controls,
			     ARRAY_SIZE(wm8974_snd_controls));
	wm8974_add_widgets(codec);

	return ret;

pcm_err:
	return ret;
}

/* power down chip */
static int wm8974_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8974 = {
	.probe = 	wm8974_probe,
	.remove = 	wm8974_remove,
	.suspend = 	wm8974_suspend,
	.resume =	wm8974_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8974);

static __devinit int wm8974_register(struct wm8974_priv *wm8974)
{
	int ret;
	struct snd_soc_codec *codec = &wm8974->codec;

	if (wm8974_codec) {
		dev_err(codec->dev, "Another WM8974 is registered\n");
		ret = -EINVAL;
		goto err;
	}

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	snd_soc_codec_set_drvdata(codec, wm8974);
	codec->name = "WM8974";
	codec->owner = THIS_MODULE;
	codec->bias_level = SND_SOC_BIAS_OFF;
	codec->set_bias_level = wm8974_set_bias_level;
	codec->dai = &wm8974_dai;
	codec->num_dai = 1;
	codec->reg_cache_size = WM8974_CACHEREGNUM;
	codec->reg_cache = &wm8974->reg_cache;

	ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		goto err;
	}

	memcpy(codec->reg_cache, wm8974_reg, sizeof(wm8974_reg));

	ret = wm8974_reset(codec);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to issue reset\n");
		goto err;
	}

	wm8974_dai.dev = codec->dev;

	wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	wm8974_codec = codec;

	ret = snd_soc_register_codec(codec);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
		goto err;
	}

	ret = snd_soc_register_dai(&wm8974_dai);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
		goto err_codec;
	}

	return 0;

err_codec:
	snd_soc_unregister_codec(codec);
err:
	kfree(wm8974);
	return ret;
}

static __devexit void wm8974_unregister(struct wm8974_priv *wm8974)
{
	wm8974_set_bias_level(&wm8974->codec, SND_SOC_BIAS_OFF);
	snd_soc_unregister_dai(&wm8974_dai);
	snd_soc_unregister_codec(&wm8974->codec);
	kfree(wm8974);
	wm8974_codec = NULL;
}

static __devinit int wm8974_i2c_probe(struct i2c_client *i2c,
				      const struct i2c_device_id *id)
{
	struct wm8974_priv *wm8974;
	struct snd_soc_codec *codec;

	wm8974 = kzalloc(sizeof(struct wm8974_priv), GFP_KERNEL);
	if (wm8974 == NULL)
		return -ENOMEM;

	codec = &wm8974->codec;
	codec->hw_write = (hw_write_t)i2c_master_send;

	i2c_set_clientdata(i2c, wm8974);
	codec->control_data = i2c;

	codec->dev = &i2c->dev;

	return wm8974_register(wm8974);
}

static __devexit int wm8974_i2c_remove(struct i2c_client *client)
{
	struct wm8974_priv *wm8974 = i2c_get_clientdata(client);
	wm8974_unregister(wm8974);
	return 0;
}

static const struct i2c_device_id wm8974_i2c_id[] = {
	{ "wm8974", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm8974_i2c_id);

static struct i2c_driver wm8974_i2c_driver = {
	.driver = {
		.name = "WM8974",
		.owner = THIS_MODULE,
	},
	.probe =    wm8974_i2c_probe,
	.remove =   __devexit_p(wm8974_i2c_remove),
	.id_table = wm8974_i2c_id,
};

static int __init wm8974_modinit(void)
{
	return i2c_add_driver(&wm8974_i2c_driver);
}
module_init(wm8974_modinit);

static void __exit wm8974_exit(void)
{
	i2c_del_driver(&wm8974_i2c_driver);
}
module_exit(wm8974_exit);

MODULE_DESCRIPTION("ASoC WM8974 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");