summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/adau1701.c
blob: 881bab4a65aab3e937be32379c867cb3d5c96b01 (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
/*
 * Driver for ADAU1701 SigmaDSP processor
 *
 * Copyright 2011 Analog Devices Inc.
 * Author: Lars-Peter Clausen <lars@metafoo.de>
 *	based on an inital version by Cliff Cai <cliff.cai@analog.com>
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "sigmadsp.h"
#include "adau1701.h"

#define ADAU1701_DSPCTRL	0x081c
#define ADAU1701_SEROCTL	0x081e
#define ADAU1701_SERICTL	0x081f

#define ADAU1701_AUXNPOW	0x0822

#define ADAU1701_OSCIPOW	0x0826
#define ADAU1701_DACSET		0x0827

#define ADAU1701_MAX_REGISTER	0x0828

#define ADAU1701_DSPCTRL_CR		(1 << 2)
#define ADAU1701_DSPCTRL_DAM		(1 << 3)
#define ADAU1701_DSPCTRL_ADM		(1 << 4)
#define ADAU1701_DSPCTRL_SR_48		0x00
#define ADAU1701_DSPCTRL_SR_96		0x01
#define ADAU1701_DSPCTRL_SR_192		0x02
#define ADAU1701_DSPCTRL_SR_MASK	0x03

#define ADAU1701_SEROCTL_INV_LRCLK	0x2000
#define ADAU1701_SEROCTL_INV_BCLK	0x1000
#define ADAU1701_SEROCTL_MASTER		0x0800

#define ADAU1701_SEROCTL_OBF16		0x0000
#define ADAU1701_SEROCTL_OBF8		0x0200
#define ADAU1701_SEROCTL_OBF4		0x0400
#define ADAU1701_SEROCTL_OBF2		0x0600
#define ADAU1701_SEROCTL_OBF_MASK	0x0600

#define ADAU1701_SEROCTL_OLF1024	0x0000
#define ADAU1701_SEROCTL_OLF512		0x0080
#define ADAU1701_SEROCTL_OLF256		0x0100
#define ADAU1701_SEROCTL_OLF_MASK	0x0180

#define ADAU1701_SEROCTL_MSB_DEALY1	0x0000
#define ADAU1701_SEROCTL_MSB_DEALY0	0x0004
#define ADAU1701_SEROCTL_MSB_DEALY8	0x0008
#define ADAU1701_SEROCTL_MSB_DEALY12	0x000c
#define ADAU1701_SEROCTL_MSB_DEALY16	0x0010
#define ADAU1701_SEROCTL_MSB_DEALY_MASK	0x001c

#define ADAU1701_SEROCTL_WORD_LEN_24	0x0000
#define ADAU1701_SEROCTL_WORD_LEN_20	0x0001
#define ADAU1701_SEROCTL_WORD_LEN_16	0x0010
#define ADAU1701_SEROCTL_WORD_LEN_MASK	0x0003

#define ADAU1701_AUXNPOW_VBPD		0x40
#define ADAU1701_AUXNPOW_VRPD		0x20

#define ADAU1701_SERICTL_I2S		0
#define ADAU1701_SERICTL_LEFTJ		1
#define ADAU1701_SERICTL_TDM		2
#define ADAU1701_SERICTL_RIGHTJ_24	3
#define ADAU1701_SERICTL_RIGHTJ_20	4
#define ADAU1701_SERICTL_RIGHTJ_18	5
#define ADAU1701_SERICTL_RIGHTJ_16	6
#define ADAU1701_SERICTL_MODE_MASK	7
#define ADAU1701_SERICTL_INV_BCLK	BIT(3)
#define ADAU1701_SERICTL_INV_LRCLK	BIT(4)

#define ADAU1701_OSCIPOW_OPD		0x04
#define ADAU1701_DACSET_DACINIT		1

#define ADAU1707_CLKDIV_UNSET		(-1UL)

#define ADAU1701_FIRMWARE "adau1701.bin"

struct adau1701 {
	int gpio_nreset;
	int gpio_pll_mode[2];
	unsigned int dai_fmt;
	unsigned int pll_clkdiv;
	unsigned int sysclk;
	struct regmap *regmap;
};

static const struct snd_kcontrol_new adau1701_controls[] = {
	SOC_SINGLE("Master Capture Switch", ADAU1701_DSPCTRL, 4, 1, 0),
};

static const struct snd_soc_dapm_widget adau1701_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC0", "Playback", ADAU1701_AUXNPOW, 3, 1),
	SND_SOC_DAPM_DAC("DAC1", "Playback", ADAU1701_AUXNPOW, 2, 1),
	SND_SOC_DAPM_DAC("DAC2", "Playback", ADAU1701_AUXNPOW, 1, 1),
	SND_SOC_DAPM_DAC("DAC3", "Playback", ADAU1701_AUXNPOW, 0, 1),
	SND_SOC_DAPM_ADC("ADC", "Capture", ADAU1701_AUXNPOW, 7, 1),

	SND_SOC_DAPM_OUTPUT("OUT0"),
	SND_SOC_DAPM_OUTPUT("OUT1"),
	SND_SOC_DAPM_OUTPUT("OUT2"),
	SND_SOC_DAPM_OUTPUT("OUT3"),
	SND_SOC_DAPM_INPUT("IN0"),
	SND_SOC_DAPM_INPUT("IN1"),
};

static const struct snd_soc_dapm_route adau1701_dapm_routes[] = {
	{ "OUT0", NULL, "DAC0" },
	{ "OUT1", NULL, "DAC1" },
	{ "OUT2", NULL, "DAC2" },
	{ "OUT3", NULL, "DAC3" },

	{ "ADC", NULL, "IN0" },
	{ "ADC", NULL, "IN1" },
};

static unsigned int adau1701_register_size(struct device *dev,
		unsigned int reg)
{
	switch (reg) {
	case ADAU1701_DSPCTRL:
	case ADAU1701_SEROCTL:
	case ADAU1701_AUXNPOW:
	case ADAU1701_OSCIPOW:
	case ADAU1701_DACSET:
		return 2;
	case ADAU1701_SERICTL:
		return 1;
	}

	dev_err(dev, "Unsupported register address: %d\n", reg);
	return 0;
}

static bool adau1701_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ADAU1701_DACSET:
		return true;
	default:
		return false;
	}
}

static int adau1701_reg_write(void *context, unsigned int reg,
			      unsigned int value)
{
	struct i2c_client *client = context;
	unsigned int i;
	unsigned int size;
	uint8_t buf[4];
	int ret;

	size = adau1701_register_size(&client->dev, reg);
	if (size == 0)
		return -EINVAL;

	buf[0] = reg >> 8;
	buf[1] = reg & 0xff;

	for (i = size + 1; i >= 2; --i) {
		buf[i] = value;
		value >>= 8;
	}

	ret = i2c_master_send(client, buf, size + 2);
	if (ret == size + 2)
		return 0;
	else if (ret < 0)
		return ret;
	else
		return -EIO;
}

static int adau1701_reg_read(void *context, unsigned int reg,
			     unsigned int *value)
{
	int ret;
	unsigned int i;
	unsigned int size;
	uint8_t send_buf[2], recv_buf[3];
	struct i2c_client *client = context;
	struct i2c_msg msgs[2];

	size = adau1701_register_size(&client->dev, reg);
	if (size == 0)
		return -EINVAL;

	send_buf[0] = reg >> 8;
	send_buf[1] = reg & 0xff;

	msgs[0].addr = client->addr;
	msgs[0].len = sizeof(send_buf);
	msgs[0].buf = send_buf;
	msgs[0].flags = 0;

	msgs[1].addr = client->addr;
	msgs[1].len = size;
	msgs[1].buf = recv_buf;
	msgs[1].flags = I2C_M_RD;

	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	if (ret < 0)
		return ret;
	else if (ret != ARRAY_SIZE(msgs))
		return -EIO;

	*value = 0;

	for (i = 0; i < size; i++)
		*value |= recv_buf[i] << (i * 8);

	return 0;
}

static int adau1701_reset(struct snd_soc_codec *codec, unsigned int clkdiv)
{
	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
	struct i2c_client *client = to_i2c_client(codec->dev);
	int ret;

	if (clkdiv != ADAU1707_CLKDIV_UNSET &&
	    gpio_is_valid(adau1701->gpio_pll_mode[0]) &&
	    gpio_is_valid(adau1701->gpio_pll_mode[1])) {
		switch (clkdiv) {
		case 64:
			gpio_set_value(adau1701->gpio_pll_mode[0], 0);
			gpio_set_value(adau1701->gpio_pll_mode[1], 0);
			break;
		case 256:
			gpio_set_value(adau1701->gpio_pll_mode[0], 0);
			gpio_set_value(adau1701->gpio_pll_mode[1], 1);
			break;
		case 384:
			gpio_set_value(adau1701->gpio_pll_mode[0], 1);
			gpio_set_value(adau1701->gpio_pll_mode[1], 0);
			break;
		case 0:	/* fallback */
		case 512:
			gpio_set_value(adau1701->gpio_pll_mode[0], 1);
			gpio_set_value(adau1701->gpio_pll_mode[1], 1);
			break;
		}
	}

	adau1701->pll_clkdiv = clkdiv;

	if (gpio_is_valid(adau1701->gpio_nreset)) {
		gpio_set_value(adau1701->gpio_nreset, 0);
		/* minimum reset time is 20ns */
		udelay(1);
		gpio_set_value(adau1701->gpio_nreset, 1);
		/* power-up time may be as long as 85ms */
		mdelay(85);
	}

	/*
	 * Postpone the firmware download to a point in time when we
	 * know the correct PLL setup
	 */
	if (clkdiv != ADAU1707_CLKDIV_UNSET) {
		ret = process_sigma_firmware(client, ADAU1701_FIRMWARE);
		if (ret) {
			dev_warn(codec->dev, "Failed to load firmware\n");
			return ret;
		}
	}

	regmap_write(adau1701->regmap, ADAU1701_DACSET, ADAU1701_DACSET_DACINIT);
	regmap_write(adau1701->regmap, ADAU1701_DSPCTRL, ADAU1701_DSPCTRL_CR);

	regcache_mark_dirty(adau1701->regmap);
	regcache_sync(adau1701->regmap);

	return 0;
}

static int adau1701_set_capture_pcm_format(struct snd_soc_codec *codec,
		snd_pcm_format_t format)
{
	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
	unsigned int mask = ADAU1701_SEROCTL_WORD_LEN_MASK;
	unsigned int val;

	switch (format) {
	case SNDRV_PCM_FORMAT_S16_LE:
		val = ADAU1701_SEROCTL_WORD_LEN_16;
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		val = ADAU1701_SEROCTL_WORD_LEN_20;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		val = ADAU1701_SEROCTL_WORD_LEN_24;
		break;
	default:
		return -EINVAL;
	}

	if (adau1701->dai_fmt == SND_SOC_DAIFMT_RIGHT_J) {
		switch (format) {
		case SNDRV_PCM_FORMAT_S16_LE:
			val |= ADAU1701_SEROCTL_MSB_DEALY16;
			break;
		case SNDRV_PCM_FORMAT_S20_3LE:
			val |= ADAU1701_SEROCTL_MSB_DEALY12;
			break;
		case SNDRV_PCM_FORMAT_S24_LE:
			val |= ADAU1701_SEROCTL_MSB_DEALY8;
			break;
		}
		mask |= ADAU1701_SEROCTL_MSB_DEALY_MASK;
	}

	snd_soc_update_bits(codec, ADAU1701_SEROCTL, mask, val);

	return 0;
}

static int adau1701_set_playback_pcm_format(struct snd_soc_codec *codec,
			snd_pcm_format_t format)
{
	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
	unsigned int val;

	if (adau1701->dai_fmt != SND_SOC_DAIFMT_RIGHT_J)
		return 0;

	switch (format) {
	case SNDRV_PCM_FORMAT_S16_LE:
		val = ADAU1701_SERICTL_RIGHTJ_16;
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		val = ADAU1701_SERICTL_RIGHTJ_20;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		val = ADAU1701_SERICTL_RIGHTJ_24;
		break;
	default:
		return -EINVAL;
	}

	snd_soc_update_bits(codec, ADAU1701_SERICTL,
		ADAU1701_SERICTL_MODE_MASK, val);

	return 0;
}

static int adau1701_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 adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
	unsigned int clkdiv = adau1701->sysclk / params_rate(params);
	snd_pcm_format_t format;
	unsigned int val;
	int ret;

	/*
	 * If the mclk/lrclk ratio changes, the chip needs updated PLL
	 * mode GPIO settings, and a full reset cycle, including a new
	 * firmware upload.
	 */
	if (clkdiv != adau1701->pll_clkdiv) {
		ret = adau1701_reset(codec, clkdiv);
		if (ret < 0)
			return ret;
	}

	switch (params_rate(params)) {
	case 192000:
		val = ADAU1701_DSPCTRL_SR_192;
		break;
	case 96000:
		val = ADAU1701_DSPCTRL_SR_96;
		break;
	case 48000:
		val = ADAU1701_DSPCTRL_SR_48;
		break;
	default:
		return -EINVAL;
	}

	snd_soc_update_bits(codec, ADAU1701_DSPCTRL,
		ADAU1701_DSPCTRL_SR_MASK, val);

	format = params_format(params);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return adau1701_set_playback_pcm_format(codec, format);
	else
		return adau1701_set_capture_pcm_format(codec, format);
}

static int adau1701_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
	unsigned int serictl = 0x00, seroctl = 0x00;
	bool invert_lrclk;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		/* master, 64-bits per sample, 1 frame per sample */
		seroctl |= ADAU1701_SEROCTL_MASTER | ADAU1701_SEROCTL_OBF16
				| ADAU1701_SEROCTL_OLF1024;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		return -EINVAL;
	}

	/* clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		invert_lrclk = false;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		invert_lrclk = true;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		invert_lrclk = false;
		serictl |= ADAU1701_SERICTL_INV_BCLK;
		seroctl |= ADAU1701_SEROCTL_INV_BCLK;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		invert_lrclk = true;
		serictl |= ADAU1701_SERICTL_INV_BCLK;
		seroctl |= ADAU1701_SEROCTL_INV_BCLK;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		serictl |= ADAU1701_SERICTL_LEFTJ;
		seroctl |= ADAU1701_SEROCTL_MSB_DEALY0;
		invert_lrclk = !invert_lrclk;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		serictl |= ADAU1701_SERICTL_RIGHTJ_24;
		seroctl |= ADAU1701_SEROCTL_MSB_DEALY8;
		invert_lrclk = !invert_lrclk;
		break;
	default:
		return -EINVAL;
	}

	if (invert_lrclk) {
		seroctl |= ADAU1701_SEROCTL_INV_LRCLK;
		serictl |= ADAU1701_SERICTL_INV_LRCLK;
	}

	adau1701->dai_fmt = fmt & SND_SOC_DAIFMT_FORMAT_MASK;

	regmap_write(adau1701->regmap, ADAU1701_SERICTL, serictl);
	regmap_update_bits(adau1701->regmap, ADAU1701_SEROCTL,
		~ADAU1701_SEROCTL_WORD_LEN_MASK, seroctl);

	return 0;
}

static int adau1701_set_bias_level(struct snd_soc_codec *codec,
		enum snd_soc_bias_level level)
{
	unsigned int mask = ADAU1701_AUXNPOW_VBPD | ADAU1701_AUXNPOW_VRPD;

	switch (level) {
	case SND_SOC_BIAS_ON:
		break;
	case SND_SOC_BIAS_PREPARE:
		break;
	case SND_SOC_BIAS_STANDBY:
		/* Enable VREF and VREF buffer */
		snd_soc_update_bits(codec, ADAU1701_AUXNPOW, mask, 0x00);
		break;
	case SND_SOC_BIAS_OFF:
		/* Disable VREF and VREF buffer */
		snd_soc_update_bits(codec, ADAU1701_AUXNPOW, mask, mask);
		break;
	}

	codec->dapm.bias_level = level;
	return 0;
}

static int adau1701_digital_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	unsigned int mask = ADAU1701_DSPCTRL_DAM;
	unsigned int val;

	if (mute)
		val = 0;
	else
		val = mask;

	snd_soc_update_bits(codec, ADAU1701_DSPCTRL, mask, val);

	return 0;
}

static int adau1701_set_sysclk(struct snd_soc_codec *codec, int clk_id,
	int source, unsigned int freq, int dir)
{
	unsigned int val;
	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);

	switch (clk_id) {
	case ADAU1701_CLK_SRC_OSC:
		val = 0x0;
		break;
	case ADAU1701_CLK_SRC_MCLK:
		val = ADAU1701_OSCIPOW_OPD;
		break;
	default:
		return -EINVAL;
	}

	snd_soc_update_bits(codec, ADAU1701_OSCIPOW, ADAU1701_OSCIPOW_OPD, val);
	adau1701->sysclk = freq;

	return 0;
}

#define ADAU1701_RATES (SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
	SNDRV_PCM_RATE_192000)

#define ADAU1701_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
	SNDRV_PCM_FMTBIT_S24_LE)

static const struct snd_soc_dai_ops adau1701_dai_ops = {
	.set_fmt	= adau1701_set_dai_fmt,
	.hw_params	= adau1701_hw_params,
	.digital_mute	= adau1701_digital_mute,
};

static struct snd_soc_dai_driver adau1701_dai = {
	.name = "adau1701",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 8,
		.rates = ADAU1701_RATES,
		.formats = ADAU1701_FORMATS,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 2,
		.channels_max = 8,
		.rates = ADAU1701_RATES,
		.formats = ADAU1701_FORMATS,
	},
	.ops = &adau1701_dai_ops,
	.symmetric_rates = 1,
};

#ifdef CONFIG_OF
static const struct of_device_id adau1701_dt_ids[] = {
	{ .compatible = "adi,adau1701", },
	{ }
};
MODULE_DEVICE_TABLE(of, adau1701_dt_ids);
#endif

static int adau1701_probe(struct snd_soc_codec *codec)
{
	int ret;
	struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);

	codec->control_data = to_i2c_client(codec->dev);

	/*
	 * Let the pll_clkdiv variable default to something that won't happen
	 * at runtime. That way, we can postpone the firmware download from
	 * adau1701_reset() to a point in time when we know the correct PLL
	 * mode parameters.
	 */
	adau1701->pll_clkdiv = ADAU1707_CLKDIV_UNSET;

	/* initalize with pre-configured pll mode settings */
	ret = adau1701_reset(codec, adau1701->pll_clkdiv);
	if (ret < 0)
		return ret;

	return 0;
}

static struct snd_soc_codec_driver adau1701_codec_drv = {
	.probe			= adau1701_probe,
	.set_bias_level		= adau1701_set_bias_level,
	.idle_bias_off		= true,

	.controls		= adau1701_controls,
	.num_controls		= ARRAY_SIZE(adau1701_controls),
	.dapm_widgets		= adau1701_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(adau1701_dapm_widgets),
	.dapm_routes		= adau1701_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(adau1701_dapm_routes),

	.set_sysclk		= adau1701_set_sysclk,
};

static const struct regmap_config adau1701_regmap = {
	.reg_bits		= 16,
	.val_bits		= 32,
	.max_register		= ADAU1701_MAX_REGISTER,
	.cache_type		= REGCACHE_RBTREE,
	.volatile_reg		= adau1701_volatile_reg,
	.reg_write		= adau1701_reg_write,
	.reg_read		= adau1701_reg_read,
};

static int adau1701_i2c_probe(struct i2c_client *client,
			      const struct i2c_device_id *id)
{
	struct adau1701 *adau1701;
	struct device *dev = &client->dev;
	int gpio_nreset = -EINVAL;
	int gpio_pll_mode[2] = { -EINVAL, -EINVAL };
	int ret;

	adau1701 = devm_kzalloc(dev, sizeof(*adau1701), GFP_KERNEL);
	if (!adau1701)
		return -ENOMEM;

	adau1701->regmap = devm_regmap_init(dev, NULL, client,
					    &adau1701_regmap);
	if (IS_ERR(adau1701->regmap))
		return PTR_ERR(adau1701->regmap);

	if (dev->of_node) {
		gpio_nreset = of_get_named_gpio(dev->of_node, "reset-gpio", 0);
		if (gpio_nreset < 0 && gpio_nreset != -ENOENT)
			return gpio_nreset;

		gpio_pll_mode[0] = of_get_named_gpio(dev->of_node,
						   "adi,pll-mode-gpios", 0);
		if (gpio_pll_mode[0] < 0 && gpio_pll_mode[0] != -ENOENT)
			return gpio_pll_mode[0];

		gpio_pll_mode[1] = of_get_named_gpio(dev->of_node,
						   "adi,pll-mode-gpios", 1);
		if (gpio_pll_mode[1] < 0 && gpio_pll_mode[1] != -ENOENT)
			return gpio_pll_mode[1];
	}

	if (gpio_is_valid(gpio_nreset)) {
		ret = devm_gpio_request_one(dev, gpio_nreset, GPIOF_OUT_INIT_LOW,
					    "ADAU1701 Reset");
		if (ret < 0)
			return ret;
	}

	if (gpio_is_valid(gpio_pll_mode[0]) &&
	    gpio_is_valid(gpio_pll_mode[1])) {
		ret = devm_gpio_request_one(dev, gpio_pll_mode[0],
					    GPIOF_OUT_INIT_LOW,
					    "ADAU1701 PLL mode 0");
		if (ret < 0)
			return ret;

		ret = devm_gpio_request_one(dev, gpio_pll_mode[1],
					    GPIOF_OUT_INIT_LOW,
					    "ADAU1701 PLL mode 1");
		if (ret < 0)
			return ret;
	}

	adau1701->gpio_nreset = gpio_nreset;
	adau1701->gpio_pll_mode[0] = gpio_pll_mode[0];
	adau1701->gpio_pll_mode[1] = gpio_pll_mode[1];

	i2c_set_clientdata(client, adau1701);
	ret = snd_soc_register_codec(&client->dev, &adau1701_codec_drv,
			&adau1701_dai, 1);
	return ret;
}

static int adau1701_i2c_remove(struct i2c_client *client)
{
	snd_soc_unregister_codec(&client->dev);
	return 0;
}

static const struct i2c_device_id adau1701_i2c_id[] = {
	{ "adau1701", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adau1701_i2c_id);

static struct i2c_driver adau1701_i2c_driver = {
	.driver = {
		.name	= "adau1701",
		.owner	= THIS_MODULE,
		.of_match_table	= of_match_ptr(adau1701_dt_ids),
	},
	.probe		= adau1701_i2c_probe,
	.remove		= adau1701_i2c_remove,
	.id_table	= adau1701_i2c_id,
};

module_i2c_driver(adau1701_i2c_driver);

MODULE_DESCRIPTION("ASoC ADAU1701 SigmaDSP driver");
MODULE_AUTHOR("Cliff Cai <cliff.cai@analog.com>");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud