summaryrefslogtreecommitdiff
path: root/sound/soc/codecs/wm8731.c
blob: e725c09a3e79bf7bafa6fda17ee6112fd629e6ee (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
/*
 * wm8731.c  --  WM8731 ALSA SoC Audio driver
 *
 * Copyright 2005 Openedhand Ltd.
 *
 * 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/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.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 "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 {
	enum snd_soc_control_type control_type;
	struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
	u16 reg_cache[WM8731_CACHEREGNUM];
	unsigned int sysclk;
	int sysclk_type;
};


/*
 * wm8731 register cache
 * We can't read the WM8731 register space when we are
 * using 2 wire for device control, so we cache them instead.
 * There is no point in caching the reset register
 */
static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
	0x0097, 0x0097, 0x0079, 0x0079,
	0x000a, 0x0008, 0x009f, 0x000a,
	0x0000, 0x0000
};

#define wm8731_reset(c)	snd_soc_write(c, WM8731_RESET, 0)

static const char *wm8731_input_select[] = {"Line In", "Mic"};
static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};

static const struct soc_enum wm8731_enum[] = {
	SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
	SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
};

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 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("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
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_ENUM("Playback De-emphasis", wm8731_enum[1]),
};

/* 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_enum[0]);

static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
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 wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(source->codec);

	return wm8731->sysclk_type == WM8731_SYSCLK_MCLK;
}

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

	/* 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"},
};

static int wm8731_add_widgets(struct snd_soc_codec *codec)
{
	snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
				  ARRAY_SIZE(wm8731_dapm_widgets));

	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

	return 0;
}

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},
};

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;

	snd_soc_write(codec, WM8731_SRATE, srate);

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		iface |= 0x0004;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iface |= 0x0008;
		break;
	}

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

static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;

	/* set active */
	snd_soc_write(codec, WM8731_ACTIVE, 0x0001);

	return 0;
}

static void wm8731_shutdown(struct snd_pcm_substream *substream,
			    struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;

	/* deactivate */
	if (!codec->active) {
		udelay(50);
		snd_soc_write(codec, WM8731_ACTIVE, 0x0);
	}
}

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 wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);

	switch (clk_id) {
	case WM8731_SYSCLK_XTAL:
	case WM8731_SYSCLK_MCLK:
		wm8731->sysclk_type = clk_id;
		break;
	default:
		return -EINVAL;
	}

	switch (freq) {
	case 11289600:
	case 12000000:
	case 12288000:
	case 16934400:
	case 18432000:
		wm8731->sysclk = freq;
		break;
	default:
		return -EINVAL;
	}

	snd_soc_dapm_sync(codec);

	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 |= 0x0003;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		iface |= 0x0013;
		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 i, ret;
	u8 data[2];
	u16 *cache = codec->reg_cache;
	u16 reg;

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

			/* Sync reg_cache with the hardware */
			for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
				if (cache[i] == wm8731_reg[i])
					continue;

				data[0] = (i << 1) | ((cache[i] >> 8)
						      & 0x0001);
				data[1] = cache[i] & 0x00ff;
				codec->hw_write(codec->control_data, data, 2);
			}
		}

		/* 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:
		snd_soc_write(codec, WM8731_ACTIVE, 0x0);
		snd_soc_write(codec, WM8731_PWR, 0xffff);
		regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
				       wm8731->supplies);
		break;
	}
	codec->bias_level = level;
	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)

static struct snd_soc_dai_ops wm8731_dai_ops = {
	.prepare	= wm8731_pcm_prepare,
	.hw_params	= wm8731_hw_params,
	.shutdown	= wm8731_shutdown,
	.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,
};

#ifdef CONFIG_PM
static int wm8731_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
	wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;
}

static int wm8731_resume(struct snd_soc_codec *codec)
{
	wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
}
#else
#define wm8731_suspend NULL
#define wm8731_resume NULL
#endif

static int wm8731_probe(struct snd_soc_codec *codec)
{
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
	int ret = 0, i;

	ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8731->control_type);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		return ret;
	}

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

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

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

	wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	/* Latch the update bits */
	snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
	snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
	snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
	snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);

	/* Disable bypass path by default */
	snd_soc_update_bits(codec, WM8731_APANA, 0x8, 0);

	snd_soc_add_controls(codec, wm8731_snd_controls,
			     ARRAY_SIZE(wm8731_snd_controls));
	wm8731_add_widgets(codec);

	/* Regulators will have been enabled by bias management */
	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);

	return 0;

err_regulator_enable:
	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
err_regulator_get:
	regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);

	kfree(wm8731);
	return ret;
}

/* power down chip */
static int wm8731_remove(struct snd_soc_codec *codec)
{
	struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);

	wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);

	regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
	regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);

	return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
	.probe =	wm8731_probe,
	.remove =	wm8731_remove,
	.suspend =	wm8731_suspend,
	.resume =	wm8731_resume,
	.set_bias_level = wm8731_set_bias_level,
	.reg_cache_size = ARRAY_SIZE(wm8731_reg),
	.reg_word_size = sizeof(u16),
	.reg_cache_default = wm8731_reg,
};

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

	wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
	if (wm8731 == NULL)
		return -ENOMEM;

	wm8731->control_type = SND_SOC_SPI;
	spi_set_drvdata(spi, wm8731);

	ret = snd_soc_register_codec(&spi->dev,
			&soc_codec_dev_wm8731, &wm8731_dai, 1);
	if (ret < 0)
		kfree(wm8731);
	return ret;
}

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

static struct spi_driver wm8731_spi_driver = {
	.driver = {
		.name	= "wm8731-codec",
		.owner	= THIS_MODULE,
	},
	.probe		= wm8731_spi_probe,
	.remove		= __devexit_p(wm8731_spi_remove),
};
#endif /* CONFIG_SPI_MASTER */

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
				      const struct i2c_device_id *id)
{
	struct wm8731_priv *wm8731;
	int ret;

	wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
	if (wm8731 == NULL)
		return -ENOMEM;

	i2c_set_clientdata(i2c, wm8731);
	wm8731->control_type = SND_SOC_I2C;

	ret =  snd_soc_register_codec(&i2c->dev,
			&soc_codec_dev_wm8731, &wm8731_dai, 1);
	if (ret < 0)
		kfree(wm8731);
	return ret;
}

static __devexit int wm8731_i2c_remove(struct i2c_client *client)
{
	snd_soc_unregister_codec(&client->dev);
	kfree(i2c_get_clientdata(client));
	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-codec",
		.owner = THIS_MODULE,
	},
	.probe =    wm8731_i2c_probe,
	.remove =   __devexit_p(wm8731_i2c_remove),
	.id_table = wm8731_i2c_id,
};
#endif

static int __init wm8731_modinit(void)
{
	int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
	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 defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
	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");