aboutsummaryrefslogtreecommitdiff
path: root/sound/soc/codecs/wm8940.c
blob: e3c4bbfaae273db4502dfaa58c2e29971271e3f3 (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
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
/*
 * wm8940.c  --  WM8940 ALSA Soc Audio driver
 *
 * Author: Jonathan Cameron <jic23@cam.ac.uk>
 *
 * Based on wm8510.c
 *    Copyright  2006 Wolfson Microelectronics PLC.
 *    Author:  Liam Girdwood <lrg@slimlogic.co.uk>
 *
 * 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.
 *
 * Not currently handled:
 * Notch filter control
 * AUXMode (inverting vs mixer)
 * No means to obtain current gain if alc enabled.
 * No use made of gpio
 * Fast VMID discharge for power down
 * Soft Start
 * DLR and ALR Swaps not enabled
 * Digital Sidetone not supported
 */
#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/spi/spi.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 "wm8940.h"

struct wm8940_priv {
	unsigned int sysclk;
	u16 reg_cache[WM8940_CACHEREGNUM];
	struct snd_soc_codec codec;
};

static u16 wm8940_reg_defaults[] = {
	0x8940, /* Soft Reset */
	0x0000, /* Power 1 */
	0x0000, /* Power 2 */
	0x0000, /* Power 3 */
	0x0010, /* Interface Control */
	0x0000, /* Companding Control */
	0x0140, /* Clock Control */
	0x0000, /* Additional Controls */
	0x0000, /* GPIO Control */
	0x0002, /* Auto Increment Control */
	0x0000, /* DAC Control */
	0x00FF, /* DAC Volume */
	0,
	0,
	0x0100, /* ADC Control */
	0x00FF, /* ADC Volume */
	0x0000, /* Notch Filter 1 Control 1 */
	0x0000, /* Notch Filter 1 Control 2 */
	0x0000, /* Notch Filter 2 Control 1 */
	0x0000, /* Notch Filter 2 Control 2 */
	0x0000, /* Notch Filter 3 Control 1 */
	0x0000, /* Notch Filter 3 Control 2 */
	0x0000, /* Notch Filter 4 Control 1 */
	0x0000, /* Notch Filter 4 Control 2 */
	0x0032, /* DAC Limit Control 1 */
	0x0000, /* DAC Limit Control 2 */
	0,
	0,
	0,
	0,
	0,
	0,
	0x0038, /* ALC Control 1 */
	0x000B, /* ALC Control 2 */
	0x0032, /* ALC Control 3 */
	0x0000, /* Noise Gate */
	0x0041, /* PLLN */
	0x000C, /* PLLK1 */
	0x0093, /* PLLK2 */
	0x00E9, /* PLLK3 */
	0,
	0,
	0x0030, /* ALC Control 4 */
	0,
	0x0002, /* Input Control */
	0x0050, /* PGA Gain */
	0,
	0x0002, /* ADC Boost Control */
	0,
	0x0002, /* Output Control */
	0x0000, /* Speaker Mixer Control */
	0,
	0,
	0,
	0x0079, /* Speaker Volume */
	0,
	0x0000, /* Mono Mixer Control */
};

static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
static const struct soc_enum wm8940_adc_companding_enum
= SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
static const struct soc_enum wm8940_dac_companding_enum
= SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);

static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
static const struct soc_enum wm8940_alc_mode_enum
= SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);

static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
static const struct soc_enum wm8940_mic_bias_level_enum
= SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);

static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
static const struct soc_enum wm8940_filter_mode_enum
= SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);

static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);

static const struct snd_kcontrol_new wm8940_snd_controls[] = {
	SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
		   6, 1, 0),
	SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
	SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),

	SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
	SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
	SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
		       3, 7, 1, wm8940_alc_max_tlv),
	SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
		       0, 7, 0, wm8940_alc_min_tlv),
	SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
		       0, 14, 0, wm8940_alc_tar_tlv),
	SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
	SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
	SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
	SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
	SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
		   3, 1, 0),
	SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
		   0, 7, 0),

	SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
	SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
	SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
	SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
		       4, 9, 1, wm8940_lim_thresh_tlv),
	SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
		       0, 12, 0, wm8940_lim_boost_tlv),

	SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
	SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
		       0, 63, 0, wm8940_pga_vol_tlv),
	SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
		       0, 255, 0, wm8940_adc_tlv),
	SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
		       0, 255, 0, wm8940_adc_tlv),
	SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
	SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
		       8, 1, 0, wm8940_capture_boost_vol_tlv),
	SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
		       0, 63, 0, wm8940_spk_vol_tlv),
	SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),

	SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
		       8, 1, 1, wm8940_att_tlv),
	SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),

	SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
	SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
		       7, 1, 1, wm8940_att_tlv),

	SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
	SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
	SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
	SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
	SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
	SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
	SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
};

static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
	SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
	SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
};

static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
	SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
	SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
};

static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
	SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
	SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
			    0, 7, 0, wm8940_boost_vol_tlv),
	SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
			    4, 7, 0, wm8940_boost_vol_tlv),
};

static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
	SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
	SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
	SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
};

static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
	SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
			   &wm8940_speaker_mixer_controls[0],
			   ARRAY_SIZE(wm8940_speaker_mixer_controls)),
	SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
			   &wm8940_mono_mixer_controls[0],
			   ARRAY_SIZE(wm8940_mono_mixer_controls)),
	SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),

	SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
	SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
	SND_SOC_DAPM_OUTPUT("MONOOUT"),
	SND_SOC_DAPM_OUTPUT("SPKOUTP"),
	SND_SOC_DAPM_OUTPUT("SPKOUTN"),

	SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
	SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
	SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
			   &wm8940_micpga_controls[0],
			   ARRAY_SIZE(wm8940_micpga_controls)),
	SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
			   &wm8940_input_boost_controls[0],
			   ARRAY_SIZE(wm8940_input_boost_controls)),
	SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),

	SND_SOC_DAPM_INPUT("MICN"),
	SND_SOC_DAPM_INPUT("MICP"),
	SND_SOC_DAPM_INPUT("AUX"),
};

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"},

	/*  Microphone PGA */
	{"Mic PGA", "MICN Switch", "MICN"},
	{"Mic PGA", "MICP Switch", "MICP"},
	{"Mic PGA", "AUX Switch", "AUX"},

	/* Boost Mixer */
	{"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
	{"Boost Mixer", "Mic Volume",  "MICP"},
	{"Boost Mixer", "Aux Volume", "Aux Input"},

	{"ADC", NULL, "Boost Mixer"},
};

static int wm8940_add_widgets(struct snd_soc_codec *codec)
{
	int ret;

	ret = snd_soc_dapm_new_controls(codec, wm8940_dapm_widgets,
					ARRAY_SIZE(wm8940_dapm_widgets));
	if (ret)
		goto error_ret;
	ret = snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
	if (ret)
		goto error_ret;

error_ret:
	return ret;
}

#define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0);

static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
			      unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67;
	u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		clk |= 1;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		return -EINVAL;
	}
	snd_soc_write(codec, WM8940_CLOCK, clk);

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		iface |= (2 << 3);
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		iface |= (1 << 3);
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		break;
	case SND_SOC_DAIFMT_DSP_A:
		iface |= (3 << 3);
		break;
	case SND_SOC_DAIFMT_DSP_B:
		iface |= (3 << 3) | (1 << 7);
		break;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	case SND_SOC_DAIFMT_NB_IF:
		iface |= (1 << 7);
		break;
	case SND_SOC_DAIFMT_IB_NF:
		iface |= (1 << 8);
		break;
	case SND_SOC_DAIFMT_IB_IF:
		iface |= (1 << 8) | (1 << 7);
		break;
	}

	snd_soc_write(codec, WM8940_IFACE, iface);

	return 0;
}

static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->card->codec;
	u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
	u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
	u16 companding =  snd_soc_read(codec,
						WM8940_COMPANDINGCTL) & 0xFFDF;
	int ret;

	/* LoutR control */
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
	    && params_channels(params) == 2)
		iface |= (1 << 9);

	switch (params_rate(params)) {
	case 8000:
		addcntrl |= (0x5 << 1);
		break;
	case 11025:
		addcntrl |= (0x4 << 1);
		break;
	case 16000:
		addcntrl |= (0x3 << 1);
		break;
	case 22050:
		addcntrl |= (0x2 << 1);
		break;
	case 32000:
		addcntrl |= (0x1 << 1);
		break;
	case 44100:
	case 48000:
		break;
	}
	ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
	if (ret)
		goto error_ret;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		companding = companding | (1 << 5);
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		iface |= (1 << 5);
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iface |= (2 << 5);
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		iface |= (3 << 5);
		break;
	}
	ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
	if (ret)
		goto error_ret;
	ret = snd_soc_write(codec, WM8940_IFACE, iface);

error_ret:
	return ret;
}

static int wm8940_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf;

	if (mute)
		mute_reg |= 0x40;

	return snd_soc_write(codec, WM8940_DAC, mute_reg);
}

static int wm8940_set_bias_level(struct snd_soc_codec *codec,
				 enum snd_soc_bias_level level)
{
	u16 val;
	u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0;
	int ret = 0;

	switch (level) {
	case SND_SOC_BIAS_ON:
		/* ensure bufioen and biasen */
		pwr_reg |= (1 << 2) | (1 << 3);
		/* Enable thermal shutdown */
		val = snd_soc_read(codec, WM8940_OUTPUTCTL);
		ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2);
		if (ret)
			break;
		/* set vmid to 75k */
		ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
		break;
	case SND_SOC_BIAS_PREPARE:
		/* ensure bufioen and biasen */
		pwr_reg |= (1 << 2) | (1 << 3);
		ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
		break;
	case SND_SOC_BIAS_STANDBY:
		/* ensure bufioen and biasen */
		pwr_reg |= (1 << 2) | (1 << 3);
		/* set vmid to 300k for standby */
		ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2);
		break;
	case SND_SOC_BIAS_OFF:
		ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg);
		break;
	}

	return ret;
}

struct pll_ {
	unsigned int pre_scale:2;
	unsigned int n:4;
	unsigned int k;
};

static struct pll_ pll_div;

/* 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(unsigned int target, unsigned int source)
{
	unsigned long long Kpart;
	unsigned int K, Ndiv, Nmod;
	/* The left shift ist to avoid accuracy loss when right shifting */
	Ndiv = target / source;

	if (Ndiv > 12) {
		source <<= 1;
		/* Multiply by 2 */
		pll_div.pre_scale = 0;
		Ndiv = target / source;
	} else if (Ndiv < 3) {
		source >>= 2;
		/* Divide by 4 */
		pll_div.pre_scale = 3;
		Ndiv = target / source;
	} else if (Ndiv < 6) {
		source >>= 1;
		/* divide by 2 */
		pll_div.pre_scale = 2;
		Ndiv = target / source;
	} else
		pll_div.pre_scale = 1;

	if ((Ndiv < 6) || (Ndiv > 12))
		printk(KERN_WARNING
			"WM8940 N value %d outwith recommended range!d\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;
}

/* Untested at the moment */
static int wm8940_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;
	u16 reg;

	/* Turn off PLL */
	reg = snd_soc_read(codec, WM8940_POWER1);
	snd_soc_write(codec, WM8940_POWER1, reg & 0x1df);

	if (freq_in == 0 || freq_out == 0) {
		/* Clock CODEC directly from MCLK */
		reg = snd_soc_read(codec, WM8940_CLOCK);
		snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff);
		/* Pll power down */
		snd_soc_write(codec, WM8940_PLLN, (1 << 7));
		return 0;
	}

	/* Pll is followed by a frequency divide by 4 */
	pll_factors(freq_out*4, freq_in);
	if (pll_div.k)
		snd_soc_write(codec, WM8940_PLLN,
			     (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
	else /* No factional component */
		snd_soc_write(codec, WM8940_PLLN,
			     (pll_div.pre_scale << 4) | pll_div.n);
	snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18);
	snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
	snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
	/* Enable the PLL */
	reg = snd_soc_read(codec, WM8940_POWER1);
	snd_soc_write(codec, WM8940_POWER1, reg | 0x020);

	/* Run CODEC from PLL instead of MCLK */
	reg = snd_soc_read(codec, WM8940_CLOCK);
	snd_soc_write(codec, WM8940_CLOCK, reg | 0x100);

	return 0;
}

static int wm8940_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 wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);

	switch (freq) {
	case 11289600:
	case 12000000:
	case 12288000:
	case 16934400:
	case 18432000:
		wm8940->sysclk = freq;
		return 0;
	}
	return -EINVAL;
}

static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
				 int div_id, int div)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 reg;
	int ret = 0;

	switch (div_id) {
	case WM8940_BCLKDIV:
		reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFEF3;
		ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
		break;
	case WM8940_MCLKDIV:
		reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F;
		ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5));
		break;
	case WM8940_OPCLKDIV:
		reg = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFCF;
		ret = snd_soc_write(codec, WM8940_ADDCNTRL, reg | (div << 4));
		break;
	}
	return ret;
}

#define WM8940_RATES SNDRV_PCM_RATE_8000_48000

#define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 |				\
			SNDRV_PCM_FMTBIT_S16_LE |			\
			SNDRV_PCM_FMTBIT_S20_3LE |			\
			SNDRV_PCM_FMTBIT_S24_LE |			\
			SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_ops wm8940_dai_ops = {
	.hw_params = wm8940_i2s_hw_params,
	.set_sysclk = wm8940_set_dai_sysclk,
	.digital_mute = wm8940_mute,
	.set_fmt = wm8940_set_dai_fmt,
	.set_clkdiv = wm8940_set_dai_clkdiv,
	.set_pll = wm8940_set_dai_pll,
};

struct snd_soc_dai wm8940_dai = {
	.name = "WM8940",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8940_RATES,
		.formats = WM8940_FORMATS,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8940_RATES,
		.formats = WM8940_FORMATS,
	},
	.ops = &wm8940_dai_ops,
	.symmetric_rates = 1,
};
EXPORT_SYMBOL_GPL(wm8940_dai);

static int wm8940_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;

	return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
}

static int wm8940_resume(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;
	int i;
	int ret;
	u8 data[3];
	u16 *cache = codec->reg_cache;

	/* Sync reg_cache with the hardware
	 * Could use auto incremented writes to speed this up
	 */
	for (i = 0; i < ARRAY_SIZE(wm8940_reg_defaults); i++) {
		data[0] = i;
		data[1] = (cache[i] & 0xFF00) >> 8;
		data[2] = cache[i] & 0x00FF;
		ret = codec->hw_write(codec->control_data, data, 3);
		if (ret < 0)
			goto error_ret;
		else if (ret != 3) {
			ret = -EIO;
			goto error_ret;
		}
	}
	ret = wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	if (ret)
		goto error_ret;

error_ret:
	return ret;
}

static struct snd_soc_codec *wm8940_codec;

static int wm8940_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;

	int ret = 0;

	if (wm8940_codec == NULL) {
		dev_err(&pdev->dev, "Codec device not registered\n");
		return -ENODEV;
	}

	socdev->card->codec = wm8940_codec;
	codec = wm8940_codec;

	mutex_init(&codec->mutex);
	/* 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;
	}

	ret = snd_soc_add_controls(codec, wm8940_snd_controls,
			     ARRAY_SIZE(wm8940_snd_controls));
	if (ret)
		goto error_free_pcms;
	ret = wm8940_add_widgets(codec);
	if (ret)
		goto error_free_pcms;

	return ret;

error_free_pcms:
	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);
pcm_err:
	return ret;
}

static int wm8940_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_wm8940 = {
	.probe = wm8940_probe,
	.remove = wm8940_remove,
	.suspend = wm8940_suspend,
	.resume = wm8940_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8940);

static int wm8940_register(struct wm8940_priv *wm8940,
			   enum snd_soc_control_type control)
{
	struct wm8940_setup_data *pdata = wm8940->codec.dev->platform_data;
	struct snd_soc_codec *codec = &wm8940->codec;
	int ret;
	u16 reg;
	if (wm8940_codec) {
		dev_err(codec->dev, "Another WM8940 is registered\n");
		return -EINVAL;
	}

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

	snd_soc_codec_set_drvdata(codec, wm8940);
	codec->name = "WM8940";
	codec->owner = THIS_MODULE;
	codec->bias_level = SND_SOC_BIAS_OFF;
	codec->set_bias_level = wm8940_set_bias_level;
	codec->dai = &wm8940_dai;
	codec->num_dai = 1;
	codec->reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults);
	codec->reg_cache = &wm8940->reg_cache;

	ret = snd_soc_codec_set_cache_io(codec, 8, 16, control);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		return ret;
	}

	memcpy(codec->reg_cache, wm8940_reg_defaults,
	       sizeof(wm8940_reg_defaults));

	ret = wm8940_reset(codec);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to issue reset\n");
		return ret;
	}

	wm8940_dai.dev = codec->dev;

	wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
	if (ret < 0)
		return ret;

	if (!pdata)
		dev_warn(codec->dev, "No platform data supplied\n");
	else {
		reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
		ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
		if (ret < 0)
			return ret;
	}


	wm8940_codec = codec;

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

	ret = snd_soc_register_dai(&wm8940_dai);
	if (ret) {
		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
		snd_soc_unregister_codec(codec);
		return ret;
	}

	return 0;
}

static void wm8940_unregister(struct wm8940_priv *wm8940)
{
	wm8940_set_bias_level(&wm8940->codec, SND_SOC_BIAS_OFF);
	snd_soc_unregister_dai(&wm8940_dai);
	snd_soc_unregister_codec(&wm8940->codec);
	kfree(wm8940);
	wm8940_codec = NULL;
}

static int wm8940_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct wm8940_priv *wm8940;
	struct snd_soc_codec *codec;

	wm8940 = kzalloc(sizeof *wm8940, GFP_KERNEL);
	if (wm8940 == NULL)
		return -ENOMEM;

	codec = &wm8940->codec;
	codec->hw_write = (hw_write_t)i2c_master_send;
	i2c_set_clientdata(i2c, wm8940);
	codec->control_data = i2c;
	codec->dev = &i2c->dev;

	return wm8940_register(wm8940, SND_SOC_I2C);
}

static int __devexit wm8940_i2c_remove(struct i2c_client *client)
{
	struct wm8940_priv *wm8940 = i2c_get_clientdata(client);

	wm8940_unregister(wm8940);

	return 0;
}

static const struct i2c_device_id wm8940_i2c_id[] = {
	{ "wm8940", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);

static struct i2c_driver wm8940_i2c_driver = {
	.driver = {
		.name = "WM8940 I2C Codec",
		.owner = THIS_MODULE,
	},
	.probe = wm8940_i2c_probe,
	.remove = __devexit_p(wm8940_i2c_remove),
	.id_table = wm8940_i2c_id,
};

static int __init wm8940_modinit(void)
{
	int ret;

	ret = i2c_add_driver(&wm8940_i2c_driver);
	if (ret)
		printk(KERN_ERR "Failed to register WM8940 I2C driver: %d\n",
		       ret);
	return ret;
}
module_init(wm8940_modinit);

static void __exit wm8940_exit(void)
{
	i2c_del_driver(&wm8940_i2c_driver);
}
module_exit(wm8940_exit);

MODULE_DESCRIPTION("ASoC WM8940 driver");
MODULE_AUTHOR("Jonathan Cameron");
MODULE_LICENSE("GPL");