summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/max9867.c
blob: c72cb2888c21664209764eccd778f6b26d12e07e (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
// SPDX-License-Identifier: GPL-2.0
//
// MAX9867 ALSA SoC codec driver
//
// Copyright 2013-2015 Maxim Integrated Products
// Copyright 2018 Ladislav Michl <ladis@linux-mips.org>
//

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include "max9867.h"

static const char *const max9867_spmode[] = {
	"Stereo Diff", "Mono Diff",
	"Stereo Cap", "Mono Cap",
	"Stereo Single", "Mono Single",
	"Stereo Single Fast", "Mono Single Fast"
};
static const char *const max9867_filter_text[] = {"IIR", "FIR"};

static const char *const max9867_adc_dac_filter_text[] = {
	"Disabled",
	"Elliptical/16/256",
	"Butterworth/16/500",
	"Elliptical/8/256",
	"Butterworth/8/500",
	"Butterworth/8-24"
};

static SOC_ENUM_SINGLE_DECL(max9867_filter, MAX9867_CODECFLTR, 7,
	max9867_filter_text);
static SOC_ENUM_SINGLE_DECL(max9867_dac_filter, MAX9867_CODECFLTR, 0,
	max9867_adc_dac_filter_text);
static SOC_ENUM_SINGLE_DECL(max9867_adc_filter, MAX9867_CODECFLTR, 4,
	max9867_adc_dac_filter_text);
static SOC_ENUM_SINGLE_DECL(max9867_spkmode, MAX9867_MODECONFIG, 0,
	max9867_spmode);
static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(max9867_master_tlv,
	 0,  2, TLV_DB_SCALE_ITEM(-8600, 200, 1),
	 3, 17, TLV_DB_SCALE_ITEM(-7800, 400, 0),
	18, 25, TLV_DB_SCALE_ITEM(-2000, 200, 0),
	26, 34, TLV_DB_SCALE_ITEM( -500, 100, 0),
	35, 40, TLV_DB_SCALE_ITEM(  350,  50, 0),
);
static DECLARE_TLV_DB_SCALE(max9867_mic_tlv, 0, 100, 0);
static DECLARE_TLV_DB_SCALE(max9867_line_tlv, -600, 200, 0);
static DECLARE_TLV_DB_SCALE(max9867_adc_tlv, -1200, 100, 0);
static DECLARE_TLV_DB_SCALE(max9867_dac_tlv, -1500, 100, 0);
static DECLARE_TLV_DB_SCALE(max9867_dacboost_tlv, 0, 600, 0);
static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(max9867_micboost_tlv,
	0, 2, TLV_DB_SCALE_ITEM(-2000, 2000, 1),
	3, 3, TLV_DB_SCALE_ITEM(3000, 0, 0),
);

static const struct snd_kcontrol_new max9867_snd_controls[] = {
	SOC_DOUBLE_R_TLV("Master Playback Volume", MAX9867_LEFTVOL,
			MAX9867_RIGHTVOL, 0, 40, 1, max9867_master_tlv),
	SOC_DOUBLE_R_TLV("Line Capture Volume", MAX9867_LEFTLINELVL,
			MAX9867_RIGHTLINELVL, 0, 15, 1, max9867_line_tlv),
	SOC_DOUBLE_R_TLV("Mic Capture Volume", MAX9867_LEFTMICGAIN,
			MAX9867_RIGHTMICGAIN, 0, 20, 1, max9867_mic_tlv),
	SOC_DOUBLE_R_TLV("Mic Boost Capture Volume", MAX9867_LEFTMICGAIN,
			MAX9867_RIGHTMICGAIN, 5, 3, 0, max9867_micboost_tlv),
	SOC_SINGLE("Digital Sidetone Volume", MAX9867_SIDETONE, 0, 31, 1),
	SOC_SINGLE_TLV("Digital Playback Volume", MAX9867_DACLEVEL, 0, 15, 1,
			max9867_dac_tlv),
	SOC_SINGLE_TLV("Digital Boost Playback Volume", MAX9867_DACLEVEL, 4, 3, 0,
			max9867_dacboost_tlv),
	SOC_DOUBLE_TLV("Digital Capture Volume", MAX9867_ADCLEVEL, 4, 0, 15, 1,
			max9867_adc_tlv),
	SOC_ENUM("Speaker Mode", max9867_spkmode),
	SOC_SINGLE("Volume Smoothing Switch", MAX9867_MODECONFIG, 6, 1, 0),
	SOC_SINGLE("Line ZC Switch", MAX9867_MODECONFIG, 5, 1, 0),
	SOC_ENUM("DSP Filter", max9867_filter),
	SOC_ENUM("ADC Filter", max9867_adc_filter),
	SOC_ENUM("DAC Filter", max9867_dac_filter),
	SOC_SINGLE("Mono Playback Switch", MAX9867_IFC1B, 3, 1, 0),
};

/* Input mixer */
static const struct snd_kcontrol_new max9867_input_mixer_controls[] = {
	SOC_DAPM_DOUBLE("Line Capture Switch", MAX9867_INPUTCONFIG, 7, 5, 1, 0),
	SOC_DAPM_DOUBLE("Mic Capture Switch", MAX9867_INPUTCONFIG, 6, 4, 1, 0),
};

/* Output mixer */
static const struct snd_kcontrol_new max9867_output_mixer_controls[] = {
	SOC_DAPM_DOUBLE_R("Line Bypass Switch",
			  MAX9867_LEFTLINELVL, MAX9867_RIGHTLINELVL, 6, 1, 1),
};

/* Sidetone mixer */
static const struct snd_kcontrol_new max9867_sidetone_mixer_controls[] = {
	SOC_DAPM_DOUBLE("Sidetone Switch", MAX9867_SIDETONE, 6, 7, 1, 0),
};

/* Line out switch */
static const struct snd_kcontrol_new max9867_line_out_control =
	SOC_DAPM_DOUBLE_R("Switch",
			  MAX9867_LEFTVOL, MAX9867_RIGHTVOL, 6, 1, 1);

/* DMIC mux */
static const char *const dmic_mux_text[] = {
	"ADC", "DMIC"
};
static SOC_ENUM_SINGLE_DECL(left_dmic_mux_enum,
			    MAX9867_MICCONFIG, 5, dmic_mux_text);
static SOC_ENUM_SINGLE_DECL(right_dmic_mux_enum,
			    MAX9867_MICCONFIG, 4, dmic_mux_text);
static const struct snd_kcontrol_new max9867_left_dmic_mux =
	SOC_DAPM_ENUM("DMICL Mux", left_dmic_mux_enum);
static const struct snd_kcontrol_new max9867_right_dmic_mux =
	SOC_DAPM_ENUM("DMICR Mux", right_dmic_mux_enum);

static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
	SND_SOC_DAPM_INPUT("MICL"),
	SND_SOC_DAPM_INPUT("MICR"),
	SND_SOC_DAPM_INPUT("DMICL"),
	SND_SOC_DAPM_INPUT("DMICR"),
	SND_SOC_DAPM_INPUT("LINL"),
	SND_SOC_DAPM_INPUT("LINR"),

	SND_SOC_DAPM_PGA("Left Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Right Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
				     max9867_input_mixer_controls,
				     ARRAY_SIZE(max9867_input_mixer_controls)),
	SND_SOC_DAPM_MUX("DMICL Mux", SND_SOC_NOPM, 0, 0,
			 &max9867_left_dmic_mux),
	SND_SOC_DAPM_MUX("DMICR Mux", SND_SOC_NOPM, 0, 0,
			 &max9867_right_dmic_mux),
	SND_SOC_DAPM_ADC("ADCL", "HiFi Capture", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_ADC("ADCR", "HiFi Capture", SND_SOC_NOPM, 0, 0),

	SND_SOC_DAPM_MIXER("Digital", SND_SOC_NOPM, 0, 0,
			   max9867_sidetone_mixer_controls,
			   ARRAY_SIZE(max9867_sidetone_mixer_controls)),
	SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", SND_SOC_NOPM, 0, 0,
				     max9867_output_mixer_controls,
				     ARRAY_SIZE(max9867_output_mixer_controls)),
	SND_SOC_DAPM_DAC("DACL", "HiFi Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_DAC("DACR", "HiFi Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_SWITCH("Master Playback", SND_SOC_NOPM, 0, 0,
			    &max9867_line_out_control),
	SND_SOC_DAPM_OUTPUT("LOUT"),
	SND_SOC_DAPM_OUTPUT("ROUT"),
};

static const struct snd_soc_dapm_route max9867_audio_map[] = {
	{"Left Line Input", NULL, "LINL"},
	{"Right Line Input", NULL, "LINR"},
	{"Input Mixer", "Mic Capture Switch", "MICL"},
	{"Input Mixer", "Mic Capture Switch", "MICR"},
	{"Input Mixer", "Line Capture Switch", "Left Line Input"},
	{"Input Mixer", "Line Capture Switch", "Right Line Input"},
	{"DMICL Mux", "DMIC", "DMICL"},
	{"DMICR Mux", "DMIC", "DMICR"},
	{"DMICL Mux", "ADC", "Input Mixer"},
	{"DMICR Mux", "ADC", "Input Mixer"},
	{"ADCL", NULL, "DMICL Mux"},
	{"ADCR", NULL, "DMICR Mux"},

	{"Digital", "Sidetone Switch", "ADCL"},
	{"Digital", "Sidetone Switch", "ADCR"},
	{"DACL", NULL, "Digital"},
	{"DACR", NULL, "Digital"},

	{"Output Mixer", "Line Bypass Switch", "Left Line Input"},
	{"Output Mixer", "Line Bypass Switch", "Right Line Input"},
	{"Output Mixer", NULL, "DACL"},
	{"Output Mixer", NULL, "DACR"},
	{"Master Playback", "Switch", "Output Mixer"},
	{"LOUT", NULL, "Master Playback"},
	{"ROUT", NULL, "Master Playback"},
};

static const unsigned int max9867_rates_44k1[] = {
	11025, 22050, 44100,
};

static const struct snd_pcm_hw_constraint_list max9867_constraints_44k1 = {
	.list = max9867_rates_44k1,
	.count = ARRAY_SIZE(max9867_rates_44k1),
};

static const unsigned int max9867_rates_48k[] = {
	8000, 16000, 32000, 48000,
};

static const struct snd_pcm_hw_constraint_list max9867_constraints_48k = {
	.list = max9867_rates_48k,
	.count = ARRAY_SIZE(max9867_rates_48k),
};

struct max9867_priv {
	struct regmap *regmap;
	const struct snd_pcm_hw_constraint_list *constraints;
	unsigned int sysclk, pclk;
	bool master, dsp_a;
};

static int max9867_startup(struct snd_pcm_substream *substream,
			   struct snd_soc_dai *dai)
{
        struct max9867_priv *max9867 =
		snd_soc_component_get_drvdata(dai->component);

	if (max9867->constraints)
		snd_pcm_hw_constraint_list(substream->runtime, 0,
			SNDRV_PCM_HW_PARAM_RATE, max9867->constraints);

	return 0;
}

static int max9867_dai_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
	int value;
	unsigned long int rate, ratio;
	struct snd_soc_component *component = dai->component;
	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
	unsigned int ni = DIV_ROUND_CLOSEST_ULL(96ULL * 0x10000 * params_rate(params),
						max9867->pclk);

	/* set up the ni value */
	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
		MAX9867_NI_HIGH_MASK, (0xFF00 & ni) >> 8);
	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
		MAX9867_NI_LOW_MASK, 0x00FF & ni);
	if (max9867->master) {
		if (max9867->dsp_a) {
			value = MAX9867_IFC1B_48X;
		} else {
			rate = params_rate(params) * 2 * params_width(params);
			ratio = max9867->pclk / rate;
			switch (params_width(params)) {
			case 8:
			case 16:
				switch (ratio) {
				case 2:
					value = MAX9867_IFC1B_PCLK_2;
					break;
				case 4:
					value = MAX9867_IFC1B_PCLK_4;
					break;
				case 8:
					value = MAX9867_IFC1B_PCLK_8;
					break;
				case 16:
					value = MAX9867_IFC1B_PCLK_16;
					break;
				default:
					return -EINVAL;
				}
				break;
			case 24:
				value = MAX9867_IFC1B_48X;
				break;
			case 32:
				value = MAX9867_IFC1B_64X;
				break;
			default:
				return -EINVAL;
			}
		}
		regmap_update_bits(max9867->regmap, MAX9867_IFC1B,
			MAX9867_IFC1B_BCLK_MASK, value);
	} else {
		/*
		 * digital pll locks on to any externally supplied LRCLK signal
		 * and also enable rapid lock mode.
		 */
		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
			MAX9867_RAPID_LOCK, MAX9867_RAPID_LOCK);
		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
			MAX9867_PLL, MAX9867_PLL);
	}
	return 0;
}

static int max9867_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_component *component = dai->component;
	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);

	return regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
				  1 << 6, !!mute << 6);
}

static int max9867_set_dai_sysclk(struct snd_soc_dai *codec_dai,
		int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_component *component = codec_dai->component;
	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
	int value = 0;

	/* Set the prescaler based on the master clock frequency*/
	if (freq >= 10000000 && freq <= 20000000) {
		value |= MAX9867_PSCLK_10_20;
		max9867->pclk = freq;
	} else if (freq >= 20000000 && freq <= 40000000) {
		value |= MAX9867_PSCLK_20_40;
		max9867->pclk = freq / 2;
	} else if (freq >= 40000000 && freq <= 60000000) {
		value |= MAX9867_PSCLK_40_60;
		max9867->pclk = freq / 4;
	} else {
		dev_err(component->dev,
			"Invalid clock frequency %uHz (required 10-60MHz)\n",
			freq);
		return -EINVAL;
	}
	if (freq % 48000 == 0)
		max9867->constraints = &max9867_constraints_48k;
	else if (freq % 44100 == 0)
		max9867->constraints = &max9867_constraints_44k1;
	else
		dev_warn(component->dev,
			 "Unable to set exact rate with %uHz clock frequency\n",
			 freq);
	max9867->sysclk = freq;
	value = value << MAX9867_PSCLK_SHIFT;
	/* exact integer mode is not supported */
	value &= ~MAX9867_FREQ_MASK;
	regmap_update_bits(max9867->regmap, MAX9867_SYSCLK,
			MAX9867_PSCLK_MASK, value);
	return 0;
}

static int max9867_dai_set_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
{
	struct snd_soc_component *component = codec_dai->component;
	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
	u8 iface1A, iface1B;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		max9867->master = true;
		iface1A = MAX9867_MASTER;
		iface1B = MAX9867_IFC1B_48X;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		max9867->master = false;
		iface1A = iface1B = 0;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		max9867->dsp_a = false;
		iface1A |= MAX9867_I2S_DLY;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		max9867->dsp_a = true;
		iface1A |= MAX9867_TDM_MODE | MAX9867_SDOUT_HIZ;
		break;
	default:
		return -EINVAL;
	}

	/* Clock inversion bits, BCI and WCI */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	case SND_SOC_DAIFMT_IB_IF:
		iface1A |= MAX9867_WCI_MODE | MAX9867_BCI_MODE;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		iface1A |= MAX9867_BCI_MODE;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		iface1A |= MAX9867_WCI_MODE;
		break;
	default:
		return -EINVAL;
	}

	regmap_write(max9867->regmap, MAX9867_IFC1A, iface1A);
	regmap_update_bits(max9867->regmap, MAX9867_IFC1B,
			   MAX9867_IFC1B_BCLK_MASK, iface1B);

	return 0;
}

static const struct snd_soc_dai_ops max9867_dai_ops = {
	.set_sysclk	= max9867_set_dai_sysclk,
	.set_fmt	= max9867_dai_set_fmt,
	.digital_mute	= max9867_mute,
	.startup	= max9867_startup,
	.hw_params	= max9867_dai_hw_params,
};

static struct snd_soc_dai_driver max9867_dai[] = {
	{
	.name = "max9867-aif1",
	.playback = {
		.stream_name = "HiFi Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.stream_name = "HiFi Capture",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &max9867_dai_ops,
	.symmetric_rates = 1,
	}
};

#ifdef CONFIG_PM
static int max9867_suspend(struct snd_soc_component *component)
{
	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_OFF);

	return 0;
}

static int max9867_resume(struct snd_soc_component *component)
{
	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_STANDBY);

	return 0;
}
#else
#define max9867_suspend	NULL
#define max9867_resume	NULL
#endif

static int max9867_set_bias_level(struct snd_soc_component *component,
				  enum snd_soc_bias_level level)
{
	int err;
	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);

	switch (level) {
	case SND_SOC_BIAS_STANDBY:
		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
			err = regcache_sync(max9867->regmap);
			if (err)
				return err;

			err = regmap_write(max9867->regmap,
					   MAX9867_PWRMAN, 0xff);
			if (err)
				return err;
		}
		break;
	case SND_SOC_BIAS_OFF:
		err = regmap_write(max9867->regmap, MAX9867_PWRMAN, 0);
		if (err)
			return err;

		regcache_mark_dirty(max9867->regmap);
		break;
	default:
		break;
	}

	return 0;
}

static const struct snd_soc_component_driver max9867_component = {
	.controls		= max9867_snd_controls,
	.num_controls		= ARRAY_SIZE(max9867_snd_controls),
	.dapm_routes		= max9867_audio_map,
	.num_dapm_routes	= ARRAY_SIZE(max9867_audio_map),
	.dapm_widgets		= max9867_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(max9867_dapm_widgets),
	.suspend		= max9867_suspend,
	.resume			= max9867_resume,
	.set_bias_level		= max9867_set_bias_level,
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
	.non_legacy_dai_naming	= 1,
};

static bool max9867_volatile_register(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case MAX9867_STATUS:
	case MAX9867_JACKSTATUS:
	case MAX9867_AUXHIGH:
	case MAX9867_AUXLOW:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config max9867_regmap = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= MAX9867_REVISION,
	.volatile_reg	= max9867_volatile_register,
	.cache_type	= REGCACHE_RBTREE,
};

static int max9867_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
{
	struct max9867_priv *max9867;
	int ret, reg;

	max9867 = devm_kzalloc(&i2c->dev, sizeof(*max9867), GFP_KERNEL);
	if (!max9867)
		return -ENOMEM;

	i2c_set_clientdata(i2c, max9867);
	max9867->regmap = devm_regmap_init_i2c(i2c, &max9867_regmap);
	if (IS_ERR(max9867->regmap)) {
		ret = PTR_ERR(max9867->regmap);
		dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
		return ret;
	}
	ret = regmap_read(max9867->regmap, MAX9867_REVISION, &reg);
	if (ret < 0) {
		dev_err(&i2c->dev, "Failed to read: %d\n", ret);
		return ret;
	}
	dev_info(&i2c->dev, "device revision: %x\n", reg);
	ret = devm_snd_soc_register_component(&i2c->dev, &max9867_component,
			max9867_dai, ARRAY_SIZE(max9867_dai));
	if (ret < 0)
		dev_err(&i2c->dev, "Failed to register component: %d\n", ret);
	return ret;
}

static const struct i2c_device_id max9867_i2c_id[] = {
	{ "max9867", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max9867_i2c_id);

static const struct of_device_id max9867_of_match[] = {
	{ .compatible = "maxim,max9867", },
	{ }
};
MODULE_DEVICE_TABLE(of, max9867_of_match);

static struct i2c_driver max9867_i2c_driver = {
	.driver = {
		.name = "max9867",
		.of_match_table = of_match_ptr(max9867_of_match),
	},
	.probe  = max9867_i2c_probe,
	.id_table = max9867_i2c_id,
};

module_i2c_driver(max9867_i2c_driver);

MODULE_AUTHOR("Ladislav Michl <ladis@linux-mips.org>");
MODULE_DESCRIPTION("ASoC MAX9867 driver");
MODULE_LICENSE("GPL");