summaryrefslogtreecommitdiffstats
path: root/sound/soc/samsung/tm2_wm5110.c
blob: dc93941e01c3b8d4d374c451505b3f9f908ae448 (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
/*
 * Copyright (C) 2015 - 2016 Samsung Electronics Co., Ltd.
 *
 * Authors: Inha Song <ideal.song@samsung.com>
 *          Sylwester Nawrocki <s.nawrocki@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "i2s.h"
#include "../codecs/wm5110.h"

/*
 * The source clock is XCLKOUT with its mux set to the external fixed rate
 * oscillator (XXTI).
 */
#define MCLK_RATE	24000000U

#define TM2_DAI_AIF1	0
#define TM2_DAI_AIF2	1

struct tm2_machine_priv {
	struct snd_soc_component *component;
	unsigned int sysclk_rate;
	struct gpio_desc *gpio_mic_bias;
};

static int tm2_start_sysclk(struct snd_soc_card *card)
{
	struct tm2_machine_priv *priv = snd_soc_card_get_drvdata(card);
	struct snd_soc_component *component = priv->component;
	int ret;

	ret = snd_soc_component_set_pll(component, WM5110_FLL1_REFCLK,
				    ARIZONA_FLL_SRC_MCLK1,
				    MCLK_RATE,
				    priv->sysclk_rate);
	if (ret < 0) {
		dev_err(component->dev, "Failed to set FLL1 source: %d\n", ret);
		return ret;
	}

	ret = snd_soc_component_set_pll(component, WM5110_FLL1,
				    ARIZONA_FLL_SRC_MCLK1,
				    MCLK_RATE,
				    priv->sysclk_rate);
	if (ret < 0) {
		dev_err(component->dev, "Failed to start FLL1: %d\n", ret);
		return ret;
	}

	ret = snd_soc_component_set_sysclk(component, ARIZONA_CLK_SYSCLK,
				       ARIZONA_CLK_SRC_FLL1,
				       priv->sysclk_rate,
				       SND_SOC_CLOCK_IN);
	if (ret < 0) {
		dev_err(component->dev, "Failed to set SYSCLK source: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tm2_stop_sysclk(struct snd_soc_card *card)
{
	struct tm2_machine_priv *priv = snd_soc_card_get_drvdata(card);
	struct snd_soc_component *component = priv->component;
	int ret;

	ret = snd_soc_component_set_pll(component, WM5110_FLL1, 0, 0, 0);
	if (ret < 0) {
		dev_err(component->dev, "Failed to stop FLL1: %d\n", ret);
		return ret;
	}

	ret = snd_soc_component_set_sysclk(component, ARIZONA_CLK_SYSCLK,
				       ARIZONA_CLK_SRC_FLL1, 0, 0);
	if (ret < 0) {
		dev_err(component->dev, "Failed to stop SYSCLK: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tm2_aif1_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component = rtd->codec_dai->component;
	struct tm2_machine_priv *priv = snd_soc_card_get_drvdata(rtd->card);

	switch (params_rate(params)) {
	case 4000:
	case 8000:
	case 12000:
	case 16000:
	case 24000:
	case 32000:
	case 48000:
	case 96000:
	case 192000:
		/* Highest possible SYSCLK frequency: 147.456MHz */
		priv->sysclk_rate = 147456000U;
		break;
	case 11025:
	case 22050:
	case 44100:
	case 88200:
	case 176400:
		/* Highest possible SYSCLK frequency: 135.4752 MHz */
		priv->sysclk_rate = 135475200U;
		break;
	default:
		dev_err(component->dev, "Not supported sample rate: %d\n",
			params_rate(params));
		return -EINVAL;
	}

	return tm2_start_sysclk(rtd->card);
}

static struct snd_soc_ops tm2_aif1_ops = {
	.hw_params = tm2_aif1_hw_params,
};

static int tm2_aif2_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component = rtd->codec_dai->component;
	unsigned int asyncclk_rate;
	int ret;

	switch (params_rate(params)) {
	case 8000:
	case 12000:
	case 16000:
		/* Highest possible ASYNCCLK frequency: 49.152MHz */
		asyncclk_rate = 49152000U;
		break;
	case 11025:
		/* Highest possible ASYNCCLK frequency: 45.1584 MHz */
		asyncclk_rate = 45158400U;
		break;
	default:
		dev_err(component->dev, "Not supported sample rate: %d\n",
			params_rate(params));
		return -EINVAL;
	}

	ret = snd_soc_component_set_pll(component, WM5110_FLL2_REFCLK,
				    ARIZONA_FLL_SRC_MCLK1,
				    MCLK_RATE,
				    asyncclk_rate);
	if (ret < 0) {
		dev_err(component->dev, "Failed to set FLL2 source: %d\n", ret);
		return ret;
	}

	ret = snd_soc_component_set_pll(component, WM5110_FLL2,
				    ARIZONA_FLL_SRC_MCLK1,
				    MCLK_RATE,
				    asyncclk_rate);
	if (ret < 0) {
		dev_err(component->dev, "Failed to start FLL2: %d\n", ret);
		return ret;
	}

	ret = snd_soc_component_set_sysclk(component, ARIZONA_CLK_ASYNCCLK,
				       ARIZONA_CLK_SRC_FLL2,
				       asyncclk_rate,
				       SND_SOC_CLOCK_IN);
	if (ret < 0) {
		dev_err(component->dev, "Failed to set ASYNCCLK source: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tm2_aif2_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component = rtd->codec_dai->component;
	int ret;

	/* disable FLL2 */
	ret = snd_soc_component_set_pll(component, WM5110_FLL2, ARIZONA_FLL_SRC_MCLK1,
				    0, 0);
	if (ret < 0)
		dev_err(component->dev, "Failed to stop FLL2: %d\n", ret);

	return ret;
}

static struct snd_soc_ops tm2_aif2_ops = {
	.hw_params = tm2_aif2_hw_params,
	.hw_free = tm2_aif2_hw_free,
};

static int tm2_hdmi_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	unsigned int bfs;
	int bitwidth, ret;

	bitwidth = snd_pcm_format_width(params_format(params));
	if (bitwidth < 0) {
		dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
		return bitwidth;
	}

	switch (bitwidth) {
	case 48:
		bfs = 64;
		break;
	case 16:
		bfs = 32;
		break;
	default:
		dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
		return -EINVAL;
	}

	switch (params_rate(params)) {
	case 48000:
	case 96000:
	case 192000:
		break;
	default:
		dev_err(rtd->card->dev, "Unsupported sample rate: %d\n",
			params_rate(params));
		return -EINVAL;
	}

	ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_OPCLK,
					0, SAMSUNG_I2S_OPCLK_PCLK);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_clkdiv(cpu_dai, SAMSUNG_I2S_DIV_BCLK, bfs);
	if (ret < 0)
		return ret;

	return 0;
}

static struct snd_soc_ops tm2_hdmi_ops = {
	.hw_params = tm2_hdmi_hw_params,
};

static int tm2_mic_bias(struct snd_soc_dapm_widget *w,
				struct snd_kcontrol *kcontrol, int event)
{
	struct snd_soc_card *card = w->dapm->card;
	struct tm2_machine_priv *priv = snd_soc_card_get_drvdata(card);

	switch (event) {
	case SND_SOC_DAPM_PRE_PMU:
		gpiod_set_value_cansleep(priv->gpio_mic_bias,  1);
		break;
	case SND_SOC_DAPM_POST_PMD:
		gpiod_set_value_cansleep(priv->gpio_mic_bias,  0);
		break;
	}

	return 0;
}

static int tm2_set_bias_level(struct snd_soc_card *card,
				struct snd_soc_dapm_context *dapm,
				enum snd_soc_bias_level level)
{
	struct snd_soc_pcm_runtime *rtd;

	rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);

	if (dapm->dev != rtd->codec_dai->dev)
		return 0;

	switch (level) {
	case SND_SOC_BIAS_STANDBY:
		if (card->dapm.bias_level == SND_SOC_BIAS_OFF)
			tm2_start_sysclk(card);
		break;
	case SND_SOC_BIAS_OFF:
		tm2_stop_sysclk(card);
		break;
	default:
		break;
	}

	return 0;
}

static struct snd_soc_aux_dev tm2_speaker_amp_dev;

static int tm2_late_probe(struct snd_soc_card *card)
{
	struct tm2_machine_priv *priv = snd_soc_card_get_drvdata(card);
	struct snd_soc_dai_link_component dlc = { 0 };
	unsigned int ch_map[] = { 0, 1 };
	struct snd_soc_dai *amp_pdm_dai;
	struct snd_soc_pcm_runtime *rtd;
	struct snd_soc_dai *aif1_dai;
	struct snd_soc_dai *aif2_dai;
	int ret;

	rtd = snd_soc_get_pcm_runtime(card, card->dai_link[TM2_DAI_AIF1].name);
	aif1_dai = rtd->codec_dai;
	priv->component = rtd->codec_dai->component;

	ret = snd_soc_dai_set_sysclk(aif1_dai, ARIZONA_CLK_SYSCLK, 0, 0);
	if (ret < 0) {
		dev_err(aif1_dai->dev, "Failed to set SYSCLK: %d\n", ret);
		return ret;
	}

	rtd = snd_soc_get_pcm_runtime(card, card->dai_link[TM2_DAI_AIF2].name);
	aif2_dai = rtd->codec_dai;

	ret = snd_soc_dai_set_sysclk(aif2_dai, ARIZONA_CLK_ASYNCCLK, 0, 0);
	if (ret < 0) {
		dev_err(aif2_dai->dev, "Failed to set ASYNCCLK: %d\n", ret);
		return ret;
	}

	dlc.of_node = tm2_speaker_amp_dev.codec_of_node;
	amp_pdm_dai = snd_soc_find_dai(&dlc);
	if (!amp_pdm_dai)
		return -ENODEV;

	/* Set the MAX98504 V/I sense PDM Tx DAI channel mapping */
	ret = snd_soc_dai_set_channel_map(amp_pdm_dai, ARRAY_SIZE(ch_map),
					  ch_map, 0, NULL);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_tdm_slot(amp_pdm_dai, 0x3, 0x0, 2, 16);
	if (ret < 0)
		return ret;

	return 0;
}

static const struct snd_kcontrol_new tm2_controls[] = {
	SOC_DAPM_PIN_SWITCH("HP"),
	SOC_DAPM_PIN_SWITCH("SPK"),
	SOC_DAPM_PIN_SWITCH("RCV"),
	SOC_DAPM_PIN_SWITCH("VPS"),
	SOC_DAPM_PIN_SWITCH("HDMI"),

	SOC_DAPM_PIN_SWITCH("Main Mic"),
	SOC_DAPM_PIN_SWITCH("Sub Mic"),
	SOC_DAPM_PIN_SWITCH("Third Mic"),

	SOC_DAPM_PIN_SWITCH("Headset Mic"),
};

static const struct snd_soc_dapm_widget tm2_dapm_widgets[] = {
	SND_SOC_DAPM_HP("HP", NULL),
	SND_SOC_DAPM_SPK("SPK", NULL),
	SND_SOC_DAPM_SPK("RCV", NULL),
	SND_SOC_DAPM_LINE("VPS", NULL),
	SND_SOC_DAPM_LINE("HDMI", NULL),

	SND_SOC_DAPM_MIC("Main Mic", tm2_mic_bias),
	SND_SOC_DAPM_MIC("Sub Mic", NULL),
	SND_SOC_DAPM_MIC("Third Mic", NULL),

	SND_SOC_DAPM_MIC("Headset Mic", NULL),
};

static const struct snd_soc_component_driver tm2_component = {
	.name	= "tm2-audio",
};

static struct snd_soc_dai_driver tm2_ext_dai[] = {
	{
		.name = "Voice call",
		.playback = {
			.channels_min = 1,
			.channels_max = 4,
			.rate_min = 8000,
			.rate_max = 48000,
			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
					SNDRV_PCM_RATE_48000),
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		.capture = {
			.channels_min = 1,
			.channels_max = 4,
			.rate_min = 8000,
			.rate_max = 48000,
			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
					SNDRV_PCM_RATE_48000),
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
	},
	{
		.name = "Bluetooth",
		.playback = {
			.channels_min = 1,
			.channels_max = 4,
			.rate_min = 8000,
			.rate_max = 16000,
			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000),
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		.capture = {
			.channels_min = 1,
			.channels_max = 2,
			.rate_min = 8000,
			.rate_max = 16000,
			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000),
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
	},
};

static struct snd_soc_dai_link tm2_dai_links[] = {
	{
		.name		= "WM5110 AIF1",
		.stream_name	= "HiFi Primary",
		.cpu_dai_name   = SAMSUNG_I2S_DAI,
		.codec_dai_name = "wm5110-aif1",
		.ops		= &tm2_aif1_ops,
		.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBM_CFM,
	}, {
		.name		= "WM5110 Voice",
		.stream_name	= "Voice call",
		.cpu_dai_name   = SAMSUNG_I2S_DAI,
		.codec_dai_name = "wm5110-aif2",
		.ops		= &tm2_aif2_ops,
		.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBM_CFM,
		.ignore_suspend = 1,
	}, {
		.name		= "WM5110 BT",
		.stream_name	= "Bluetooth",
		.cpu_dai_name   = SAMSUNG_I2S_DAI,
		.codec_dai_name = "wm5110-aif3",
		.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBM_CFM,
		.ignore_suspend = 1,
	}, {
		.name		= "HDMI",
		.stream_name	= "i2s1",
		.ops		= &tm2_hdmi_ops,
		.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBS_CFS,
	}
};

static struct snd_soc_card tm2_card = {
	.owner			= THIS_MODULE,

	.dai_link		= tm2_dai_links,
	.controls		= tm2_controls,
	.num_controls		= ARRAY_SIZE(tm2_controls),
	.dapm_widgets		= tm2_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(tm2_dapm_widgets),
	.aux_dev		= &tm2_speaker_amp_dev,
	.num_aux_devs		= 1,

	.late_probe		= tm2_late_probe,
	.set_bias_level		= tm2_set_bias_level,
};

static int tm2_probe(struct platform_device *pdev)
{
	struct device_node *cpu_dai_node[2] = {};
	struct device_node *codec_dai_node[2] = {};
	const char *cells_name = NULL;
	struct device *dev = &pdev->dev;
	struct snd_soc_card *card = &tm2_card;
	struct tm2_machine_priv *priv;
	struct of_phandle_args args;
	struct snd_soc_dai_link *dai_link;
	int num_codecs, ret, i;

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

	snd_soc_card_set_drvdata(card, priv);
	card->dev = dev;

	priv->gpio_mic_bias = devm_gpiod_get(dev, "mic-bias", GPIOD_OUT_HIGH);
	if (IS_ERR(priv->gpio_mic_bias)) {
		dev_err(dev, "Failed to get mic bias gpio\n");
		return PTR_ERR(priv->gpio_mic_bias);
	}

	ret = snd_soc_of_parse_card_name(card, "model");
	if (ret < 0) {
		dev_err(dev, "Card name is not specified\n");
		return ret;
	}

	ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
	if (ret < 0) {
		dev_err(dev, "Audio routing is not specified or invalid\n");
		return ret;
	}

	card->aux_dev[0].codec_of_node = of_parse_phandle(dev->of_node,
							"audio-amplifier", 0);
	if (!card->aux_dev[0].codec_of_node) {
		dev_err(dev, "audio-amplifier property invalid or missing\n");
		return -EINVAL;
	}

	num_codecs = of_count_phandle_with_args(dev->of_node, "audio-codec",
						 NULL);

	/* Skip the HDMI link if not specified in DT */
	if (num_codecs > 1) {
		card->num_links = ARRAY_SIZE(tm2_dai_links);
		cells_name = "#sound-dai-cells";
	} else {
		card->num_links = ARRAY_SIZE(tm2_dai_links) - 1;
	}

	for (i = 0; i < num_codecs; i++) {
		struct of_phandle_args args;

		ret = of_parse_phandle_with_args(dev->of_node, "i2s-controller",
						 cells_name, i, &args);
		if (!args.np) {
			dev_err(dev, "i2s-controller property parse error: %d\n", i);
			ret = -EINVAL;
			goto dai_node_put;
		}
		cpu_dai_node[i] = args.np;

		codec_dai_node[i] = of_parse_phandle(dev->of_node,
						     "audio-codec", i);
		if (!codec_dai_node[i]) {
			dev_err(dev, "audio-codec property parse error\n");
			ret = -EINVAL;
			goto dai_node_put;
		}
	}

	/* Initialize WM5110 - I2S and HDMI - I2S1 DAI links */
	for_each_card_prelinks(card, i, dai_link) {
		unsigned int dai_index = 0; /* WM5110 */

		dai_link->cpu_name = NULL;
		dai_link->platform_name = NULL;

		if (num_codecs > 1 && i == card->num_links - 1)
			dai_index = 1; /* HDMI */

		dai_link->codec_of_node = codec_dai_node[dai_index];
		dai_link->cpu_of_node = cpu_dai_node[dai_index];
		dai_link->platform_of_node = cpu_dai_node[dai_index];
	}

	if (num_codecs > 1) {
		/* HDMI DAI link (I2S1) */
		i = card->num_links - 1;

		ret = of_parse_phandle_with_fixed_args(dev->of_node,
						"audio-codec", 0, 1, &args);
		if (ret) {
			dev_err(dev, "audio-codec property parse error\n");
			goto dai_node_put;
		}

		ret = snd_soc_get_dai_name(&args, &card->dai_link[i].codec_dai_name);
		if (ret) {
			dev_err(dev, "Unable to get codec_dai_name\n");
			goto dai_node_put;
		}
	}

	ret = devm_snd_soc_register_component(dev, &tm2_component,
				tm2_ext_dai, ARRAY_SIZE(tm2_ext_dai));
	if (ret < 0) {
		dev_err(dev, "Failed to register component: %d\n", ret);
		goto dai_node_put;
	}

	ret = devm_snd_soc_register_card(dev, card);
	if (ret < 0) {
		dev_err(dev, "Failed to register card: %d\n", ret);
		goto dai_node_put;
	}

dai_node_put:
	for (i = 0; i < num_codecs; i++) {
		of_node_put(codec_dai_node[i]);
		of_node_put(cpu_dai_node[i]);
	}

	of_node_put(card->aux_dev[0].codec_of_node);

	return ret;
}

static int tm2_pm_prepare(struct device *dev)
{
	struct snd_soc_card *card = dev_get_drvdata(dev);

	return tm2_stop_sysclk(card);
}

static void tm2_pm_complete(struct device *dev)
{
	struct snd_soc_card *card = dev_get_drvdata(dev);

	tm2_start_sysclk(card);
}

static const struct dev_pm_ops tm2_pm_ops = {
	.prepare	= tm2_pm_prepare,
	.suspend	= snd_soc_suspend,
	.resume		= snd_soc_resume,
	.complete	= tm2_pm_complete,
	.freeze		= snd_soc_suspend,
	.thaw		= snd_soc_resume,
	.poweroff	= snd_soc_poweroff,
	.restore	= snd_soc_resume,
};

static const struct of_device_id tm2_of_match[] = {
	{ .compatible = "samsung,tm2-audio" },
	{ },
};
MODULE_DEVICE_TABLE(of, tm2_of_match);

static struct platform_driver tm2_driver = {
	.driver = {
		.name		= "tm2-audio",
		.pm		= &tm2_pm_ops,
		.of_match_table	= tm2_of_match,
	},
	.probe	= tm2_probe,
};
module_platform_driver(tm2_driver);

MODULE_AUTHOR("Inha Song <ideal.song@samsung.com>");
MODULE_DESCRIPTION("ALSA SoC Exynos TM2 Audio Support");
MODULE_LICENSE("GPL v2");