summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/tas2780.c
blob: a6db6f0e5431fd8f53a33de225fac330e9d38abe (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
// SPDX-License-Identifier: GPL-2.0
// Driver for the Texas Instruments TAS2780 Mono
//		Audio amplifier
// Copyright (C) 2022 Texas Instruments Inc.

#include <linux/module.h>
#include <linux/err.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>

#include "tas2780.h"

struct tas2780_priv {
	struct snd_soc_component *component;
	struct gpio_desc *reset_gpio;
	struct regmap *regmap;
	struct device *dev;
	int v_sense_slot;
	int i_sense_slot;
};

static void tas2780_reset(struct tas2780_priv *tas2780)
{
	int ret = 0;

	if (tas2780->reset_gpio) {
		gpiod_set_value_cansleep(tas2780->reset_gpio, 0);
		usleep_range(2000, 2050);
		gpiod_set_value_cansleep(tas2780->reset_gpio, 1);
		usleep_range(2000, 2050);
	}

	snd_soc_component_write(tas2780->component, TAS2780_SW_RST,
				TAS2780_RST);
	if (ret)
		dev_err(tas2780->dev, "%s:errCode:0x%x Reset error!\n",
			__func__, ret);
}

#ifdef CONFIG_PM
static int tas2780_codec_suspend(struct snd_soc_component *component)
{
	struct tas2780_priv *tas2780 =
		snd_soc_component_get_drvdata(component);
	int ret = 0;

	ret = snd_soc_component_update_bits(component, TAS2780_PWR_CTRL,
		TAS2780_PWR_CTRL_MASK, TAS2780_PWR_CTRL_SHUTDOWN);
	if (ret < 0) {
		dev_err(tas2780->dev, "%s:errCode:0x%0x:power down error\n",
			__func__, ret);
		goto err;
	}
	ret = 0;
	regcache_cache_only(tas2780->regmap, true);
	regcache_mark_dirty(tas2780->regmap);
err:
	return ret;
}

static int tas2780_codec_resume(struct snd_soc_component *component)
{
	struct tas2780_priv *tas2780 =
		snd_soc_component_get_drvdata(component);
	int ret = 0;

	ret = snd_soc_component_update_bits(component, TAS2780_PWR_CTRL,
		TAS2780_PWR_CTRL_MASK, TAS2780_PWR_CTRL_ACTIVE);

	if (ret < 0) {
		dev_err(tas2780->dev, "%s:errCode:0x%0x:power down error\n",
			__func__, ret);
		goto err;
	}
	ret = 0;
	regcache_cache_only(tas2780->regmap, false);
	ret = regcache_sync(tas2780->regmap);
err:
	return ret;
}
#endif

static const char * const tas2780_ASI1_src[] = {
	"I2C offset", "Left", "Right", "LeftRightDiv2",
};

static SOC_ENUM_SINGLE_DECL(
	tas2780_ASI1_src_enum, TAS2780_TDM_CFG2, 4, tas2780_ASI1_src);

static const struct snd_kcontrol_new tas2780_asi1_mux =
	SOC_DAPM_ENUM("ASI1 Source", tas2780_ASI1_src_enum);

static const struct snd_kcontrol_new isense_switch =
	SOC_DAPM_SINGLE("Switch", TAS2780_PWR_CTRL,
			TAS2780_ISENSE_POWER_EN, 1, 1);
static const struct snd_kcontrol_new vsense_switch =
	SOC_DAPM_SINGLE("Switch", TAS2780_PWR_CTRL,
			TAS2780_VSENSE_POWER_EN, 1, 1);

static const struct snd_soc_dapm_widget tas2780_dapm_widgets[] = {
	SND_SOC_DAPM_AIF_IN("ASI1", "ASI1 Playback", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_MUX("ASI1 Sel", SND_SOC_NOPM, 0, 0, &tas2780_asi1_mux),
	SND_SOC_DAPM_SWITCH("ISENSE", TAS2780_PWR_CTRL,
		TAS2780_ISENSE_POWER_EN, 1, &isense_switch),
	SND_SOC_DAPM_SWITCH("VSENSE", TAS2780_PWR_CTRL,
		TAS2780_VSENSE_POWER_EN, 1, &vsense_switch),
	SND_SOC_DAPM_OUTPUT("OUT"),
	SND_SOC_DAPM_SIGGEN("VMON"),
	SND_SOC_DAPM_SIGGEN("IMON")
};

static const struct snd_soc_dapm_route tas2780_audio_map[] = {
	{"ASI1 Sel", "I2C offset", "ASI1"},
	{"ASI1 Sel", "Left", "ASI1"},
	{"ASI1 Sel", "Right", "ASI1"},
	{"ASI1 Sel", "LeftRightDiv2", "ASI1"},
	{"OUT", NULL, "ASI1 Sel"},
	{"ISENSE", "Switch", "IMON"},
	{"VSENSE", "Switch", "VMON"},
};

static int tas2780_mute(struct snd_soc_dai *dai, int mute, int direction)
{
	struct snd_soc_component *component = dai->component;
	struct tas2780_priv *tas2780 =
		snd_soc_component_get_drvdata(component);
	int ret = 0;

	ret = snd_soc_component_update_bits(component, TAS2780_PWR_CTRL,
		TAS2780_PWR_CTRL_MASK,
		mute ? TAS2780_PWR_CTRL_MUTE : 0);
	if (ret < 0) {
		dev_err(tas2780->dev, "%s: Failed to set powercontrol\n",
			__func__);
		goto err;
	}
	ret = 0;
err:
	return ret;
}

static int tas2780_set_bitwidth(struct tas2780_priv *tas2780, int bitwidth)
{
	struct snd_soc_component *component = tas2780->component;
	int sense_en;
	int val;
	int ret;
	int slot_size;

	switch (bitwidth) {
	case SNDRV_PCM_FORMAT_S16_LE:
		ret = snd_soc_component_update_bits(component,
			TAS2780_TDM_CFG2,
			TAS2780_TDM_CFG2_RXW_MASK,
			TAS2780_TDM_CFG2_RXW_16BITS);
		slot_size = TAS2780_TDM_CFG2_RXS_16BITS;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		ret = snd_soc_component_update_bits(component,
			TAS2780_TDM_CFG2,
			TAS2780_TDM_CFG2_RXW_MASK,
			TAS2780_TDM_CFG2_RXW_24BITS);
		slot_size = TAS2780_TDM_CFG2_RXS_24BITS;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		ret = snd_soc_component_update_bits(component,
			TAS2780_TDM_CFG2,
			TAS2780_TDM_CFG2_RXW_MASK,
			TAS2780_TDM_CFG2_RXW_32BITS);
		slot_size = TAS2780_TDM_CFG2_RXS_32BITS;
		break;

	default:
		ret = -EINVAL;
	}

	if (ret < 0) {
		dev_err(tas2780->dev, "%s:errCode:0x%x set bitwidth error\n",
			__func__, ret);
		goto err;
	}

	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG2,
		TAS2780_TDM_CFG2_RXS_MASK, slot_size);
	if (ret < 0) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x set RX slot size error\n",
			__func__, ret);
		goto err;
	}

	val = snd_soc_component_read(tas2780->component, TAS2780_PWR_CTRL);
	if (val < 0) {
		dev_err(tas2780->dev, "%s:errCode:0x%x read PWR_CTRL error\n",
			__func__, val);
		ret = val;
		goto err;
	}

	if (val & (1 << TAS2780_VSENSE_POWER_EN))
		sense_en = 0;
	else
		sense_en = TAS2780_TDM_CFG5_VSNS_ENABLE;

	ret = snd_soc_component_update_bits(tas2780->component,
		TAS2780_TDM_CFG5, TAS2780_TDM_CFG5_VSNS_ENABLE, sense_en);
	if (ret < 0) {
		dev_err(tas2780->dev, "%s:errCode:0x%x enable vSNS error\n",
			__func__, ret);
		goto err;
	}

	if (val & (1 << TAS2780_ISENSE_POWER_EN))
		sense_en = 0;
	else
		sense_en = TAS2780_TDM_CFG6_ISNS_ENABLE;

	ret = snd_soc_component_update_bits(tas2780->component,
		TAS2780_TDM_CFG6, TAS2780_TDM_CFG6_ISNS_ENABLE, sense_en);
	if (ret < 0) {
		dev_err(tas2780->dev, "%s:errCode:0x%x enable iSNS error\n",
			__func__, ret);
		goto err;
	}
	ret = 0;
err:
	return ret;
}

static int tas2780_set_samplerate(
	struct tas2780_priv *tas2780, int samplerate)
{
	struct snd_soc_component *component = tas2780->component;
	int ramp_rate_val;
	int ret;

	switch (samplerate) {
	case 48000:
		ramp_rate_val = TAS2780_TDM_CFG0_SMP_48KHZ |
				TAS2780_TDM_CFG0_44_1_48KHZ;
		break;
	case 44100:
		ramp_rate_val = TAS2780_TDM_CFG0_SMP_44_1KHZ |
				TAS2780_TDM_CFG0_44_1_48KHZ;
		break;
	case 96000:
		ramp_rate_val = TAS2780_TDM_CFG0_SMP_48KHZ |
				TAS2780_TDM_CFG0_88_2_96KHZ;
		break;
	case 88200:
		ramp_rate_val = TAS2780_TDM_CFG0_SMP_44_1KHZ |
				TAS2780_TDM_CFG0_88_2_96KHZ;
		break;
	default:
		return -EINVAL;
	}
	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG0,
		TAS2780_TDM_CFG0_SMP_MASK | TAS2780_TDM_CFG0_MASK,
		ramp_rate_val);
	if (ret < 0) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x Failed to set ramp_rate_val\n",
			__func__, ret);
		goto err;
	}
	ret = 0;
err:
	return ret;
}

static int tas2780_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
	struct snd_soc_component *component = dai->component;
	struct tas2780_priv *tas2780 =
		snd_soc_component_get_drvdata(component);
	int ret;

	ret = tas2780_set_bitwidth(tas2780, params_format(params));
	if (ret < 0)
		return ret;

	return tas2780_set_samplerate(tas2780, params_rate(params));
}

static int tas2780_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct snd_soc_component *component = dai->component;
	struct tas2780_priv *tas2780 =
		snd_soc_component_get_drvdata(component);
	u8 tdm_rx_start_slot = 0, asi_cfg_1 = 0;
	int iface;
	int ret = 0;

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		asi_cfg_1 = TAS2780_TDM_CFG1_RX_RISING;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		asi_cfg_1 = TAS2780_TDM_CFG1_RX_FALLING;
		break;
	default:
		dev_err(tas2780->dev, "ASI format Inverse is not found\n");
		return -EINVAL;
	}

	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG1,
		TAS2780_TDM_CFG1_RX_MASK, asi_cfg_1);
	if (ret < 0) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x Failed to set asi_cfg_1\n",
			__func__, ret);
		goto err;
	}

	if (((fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S)
		|| ((fmt & SND_SOC_DAIFMT_FORMAT_MASK)
		== SND_SOC_DAIFMT_DSP_A)){
		iface = TAS2780_TDM_CFG2_SCFG_I2S;
		tdm_rx_start_slot = 1;
	} else {
		if (((fmt & SND_SOC_DAIFMT_FORMAT_MASK)
			== SND_SOC_DAIFMT_DSP_B)
			|| ((fmt & SND_SOC_DAIFMT_FORMAT_MASK)
			== SND_SOC_DAIFMT_LEFT_J)) {
			iface = TAS2780_TDM_CFG2_SCFG_LEFT_J;
			tdm_rx_start_slot = 0;
		} else {
			dev_err(tas2780->dev,
				"%s:DAI Format is not found, fmt=0x%x\n",
				__func__, fmt);
			ret = -EINVAL;
			goto err;
		}
	}
	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG1,
		TAS2780_TDM_CFG1_MASK,
		(tdm_rx_start_slot << TAS2780_TDM_CFG1_51_SHIFT));
	if (ret < 0) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x Failed to set tdm_rx_start_slot\n",
			__func__, ret);
		goto err;
	}

	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG2,
		TAS2780_TDM_CFG2_SCFG_MASK, iface);
	if (ret < 0) {
		dev_err(tas2780->dev, "%s:errCode:0x%x Failed to set iface\n",
			__func__, ret);
		goto err;
	}
	ret = 0;
err:
	return ret;
}

static int tas2780_set_dai_tdm_slot(struct snd_soc_dai *dai,
				unsigned int tx_mask,
				unsigned int rx_mask,
				int slots, int slot_width)
{
	struct snd_soc_component *component = dai->component;
	struct tas2780_priv *tas2780 =
		snd_soc_component_get_drvdata(component);
	int left_slot, right_slot;
	int slots_cfg;
	int slot_size;
	int ret = 0;

	if (tx_mask == 0 || rx_mask != 0)
		return -EINVAL;

	if (slots == 1) {
		if (tx_mask != 1)
			return -EINVAL;
		left_slot = 0;
		right_slot = 0;
	} else {
		left_slot = __ffs(tx_mask);
		tx_mask &= ~(1 << left_slot);
		if (tx_mask == 0) {
			right_slot = left_slot;
		} else {
			right_slot = __ffs(tx_mask);
			tx_mask &= ~(1 << right_slot);
		}
	}

	if (tx_mask != 0 || left_slot >= slots || right_slot >= slots)
		return -EINVAL;

	slots_cfg = (right_slot << TAS2780_TDM_CFG3_RXS_SHIFT) | left_slot;
	ret = snd_soc_component_write(component, TAS2780_TDM_CFG3, slots_cfg);
	if (ret) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x Failed to set slots_cfg\n",
			__func__, ret);
		goto err;
	}

	switch (slot_width) {
	case 16:
		slot_size = TAS2780_TDM_CFG2_RXS_16BITS;
		break;
	case 24:
		slot_size = TAS2780_TDM_CFG2_RXS_24BITS;
		break;
	case 32:
		slot_size = TAS2780_TDM_CFG2_RXS_32BITS;
		break;
	default:
		ret = -EINVAL;
		goto err;
	}

	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG2,
		TAS2780_TDM_CFG2_RXS_MASK, slot_size);
	if (ret < 0) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x Failed to set slot_size\n",
			__func__, ret);
		goto err;
	}

	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG5,
		TAS2780_TDM_CFG5_50_MASK, tas2780->v_sense_slot);
	if (ret < 0) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x Failed to set v_sense_slot\n",
			__func__, ret);
		goto err;
	}

	ret = snd_soc_component_update_bits(component, TAS2780_TDM_CFG6,
		TAS2780_TDM_CFG6_50_MASK, tas2780->i_sense_slot);
	if (ret < 0) {
		dev_err(tas2780->dev,
			"%s:errCode:0x%x Failed to set i_sense_slot\n",
			__func__, ret);
		goto err;
	}
	ret = 0;
err:
	return ret;
}

static const struct snd_soc_dai_ops tas2780_dai_ops = {
	.mute_stream = tas2780_mute,
	.hw_params  = tas2780_hw_params,
	.set_fmt    = tas2780_set_fmt,
	.set_tdm_slot = tas2780_set_dai_tdm_slot,
	.no_capture_mute = 1,
};

#define TAS2780_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
			 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

#define TAS2780_RATES (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
		       SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_88200)

static struct snd_soc_dai_driver tas2780_dai_driver[] = {
	{
		.name = "tas2780 ASI1",
		.id = 0,
		.playback = {
			.stream_name    = "ASI1 Playback",
			.channels_min   = 2,
			.channels_max   = 2,
			.rates      = TAS2780_RATES,
			.formats    = TAS2780_FORMATS,
		},
		.capture = {
			.stream_name    = "ASI1 Capture",
			.channels_min   = 1,
			.channels_max   = 2,
			.rates = TAS2780_RATES,
			.formats = TAS2780_FORMATS,
		},
		.ops = &tas2780_dai_ops,
		.symmetric_rate = 1,
	},
};

static int tas2780_codec_probe(struct snd_soc_component *component)
{
	struct tas2780_priv *tas2780 =
		snd_soc_component_get_drvdata(component);
	int ret = 0;

	tas2780->component = component;

	tas2780_reset(tas2780);
	ret = snd_soc_component_update_bits(component,
			TAS2780_IC_CFG, TAS2780_IC_CFG_MASK,
			TAS2780_IC_CFG_ENABLE);
	if (ret < 0)
		dev_err(tas2780->dev, "%s:errCode:0x%0x\n",
			__func__, ret);

	return ret;
}

static DECLARE_TLV_DB_SCALE(tas2780_digital_tlv, 1100, 50, 0);
static DECLARE_TLV_DB_SCALE(tas2780_playback_volume, -10000, 50, 0);

static const struct snd_kcontrol_new tas2780_snd_controls[] = {
	SOC_SINGLE_TLV("Speaker Volume", TAS2780_DVC, 0,
		       TAS2780_DVC_MAX, 1, tas2780_playback_volume),
	SOC_SINGLE_TLV("Amp Gain Volume", TAS2780_CHNL_0, 0, 0x14, 0,
		       tas2780_digital_tlv),
};

static const struct snd_soc_component_driver soc_component_driver_tas2780 = {
	.probe			= tas2780_codec_probe,
#ifdef CONFIG_PM
	.suspend		= tas2780_codec_suspend,
	.resume			= tas2780_codec_resume,
#endif
	.controls		= tas2780_snd_controls,
	.num_controls		= ARRAY_SIZE(tas2780_snd_controls),
	.dapm_widgets		= tas2780_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(tas2780_dapm_widgets),
	.dapm_routes		= tas2780_audio_map,
	.num_dapm_routes	= ARRAY_SIZE(tas2780_audio_map),
	.idle_bias_on		= 1,
	.endianness		= 1,
};

static const struct reg_default tas2780_reg_defaults[] = {
	{ TAS2780_PAGE, 0x00 },
	{ TAS2780_SW_RST, 0x00 },
	{ TAS2780_PWR_CTRL, 0x1a },
	{ TAS2780_DVC, 0x00 },
	{ TAS2780_CHNL_0, 0x00 },
	{ TAS2780_TDM_CFG0, 0x09 },
	{ TAS2780_TDM_CFG1, 0x02 },
	{ TAS2780_TDM_CFG2, 0x0a },
	{ TAS2780_TDM_CFG3, 0x10 },
	{ TAS2780_TDM_CFG5, 0x42 },
};

static const struct regmap_range_cfg tas2780_regmap_ranges[] = {
	{
		.range_min = 0,
		.range_max = 1 * 128,
		.selector_reg = TAS2780_PAGE,
		.selector_mask = 0xff,
		.selector_shift = 0,
		.window_start = 0,
		.window_len = 128,
	},
};

static const struct regmap_config tas2780_i2c_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.reg_defaults = tas2780_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(tas2780_reg_defaults),
	.cache_type = REGCACHE_RBTREE,
	.ranges = tas2780_regmap_ranges,
	.num_ranges = ARRAY_SIZE(tas2780_regmap_ranges),
	.max_register = 1 * 128,
};

static int tas2780_parse_dt(struct device *dev, struct tas2780_priv *tas2780)
{
	int ret = 0;

	tas2780->reset_gpio = devm_gpiod_get_optional(tas2780->dev, "reset",
		GPIOD_OUT_HIGH);
	if (IS_ERR(tas2780->reset_gpio)) {
		if (PTR_ERR(tas2780->reset_gpio) == -EPROBE_DEFER) {
			tas2780->reset_gpio = NULL;
			return -EPROBE_DEFER;
		}
	}

	ret = fwnode_property_read_u32(dev->fwnode, "ti,imon-slot-no",
		&tas2780->i_sense_slot);
	if (ret)
		tas2780->i_sense_slot = 0;

	ret = fwnode_property_read_u32(dev->fwnode, "ti,vmon-slot-no",
		&tas2780->v_sense_slot);
	if (ret)
		tas2780->v_sense_slot = 2;

	return 0;
}

static int tas2780_i2c_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct tas2780_priv *tas2780;
	int result;

	tas2780 = devm_kzalloc(&client->dev, sizeof(struct tas2780_priv),
		GFP_KERNEL);
	if (!tas2780)
		return -ENOMEM;
	tas2780->dev = &client->dev;
	i2c_set_clientdata(client, tas2780);
	dev_set_drvdata(&client->dev, tas2780);

	tas2780->regmap = devm_regmap_init_i2c(client, &tas2780_i2c_regmap);
	if (IS_ERR(tas2780->regmap)) {
		result = PTR_ERR(tas2780->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			result);
		return result;
	}

	if (client->dev.of_node) {
		result = tas2780_parse_dt(&client->dev, tas2780);
		if (result) {
			dev_err(tas2780->dev,
				"%s: Failed to parse devicetree\n", __func__);
			return result;
		}
	}

	return devm_snd_soc_register_component(tas2780->dev,
		&soc_component_driver_tas2780, tas2780_dai_driver,
		ARRAY_SIZE(tas2780_dai_driver));
}

static const struct i2c_device_id tas2780_i2c_id[] = {
	{ "tas2780", 0},
	{ }
};
MODULE_DEVICE_TABLE(i2c, tas2780_i2c_id);

#if defined(CONFIG_OF)
static const struct of_device_id tas2780_of_match[] = {
	{ .compatible = "ti,tas2780" },
	{},
};
MODULE_DEVICE_TABLE(of, tas2780_of_match);
#endif

static struct i2c_driver tas2780_i2c_driver = {
	.driver = {
		.name   = "tas2780",
		.of_match_table = of_match_ptr(tas2780_of_match),
	},
	.probe  = tas2780_i2c_probe,
	.id_table   = tas2780_i2c_id,
};
module_i2c_driver(tas2780_i2c_driver);

MODULE_AUTHOR("Raphael Xu <raphael-xu@ti.com>");
MODULE_DESCRIPTION("TAS2780 I2C Smart Amplifier driver");
MODULE_LICENSE("GPL");