atmel-classd.c 18 KB
Newer Older
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
/* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
 *
 * Copyright (C) 2015 Atmel
 *
 * Author: Songjun Wu <songjun.wu@atmel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 or later
 * as published by the Free Software Foundation.
 */

#include <linux/of.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>
#include "atmel-classd.h"

struct atmel_classd_pdata {
	bool non_overlap_enable;
	int non_overlap_time;
	int pwm_type;
	const char *card_name;
};

struct atmel_classd {
	dma_addr_t phy_base;
	struct regmap *regmap;
	struct clk *pclk;
	struct clk *gclk;
	struct clk *aclk;
	int irq;
	const struct atmel_classd_pdata *pdata;
};

#ifdef CONFIG_OF
static const struct of_device_id atmel_classd_of_match[] = {
	{
		.compatible = "atmel,sama5d2-classd",
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, atmel_classd_of_match);

static struct atmel_classd_pdata *atmel_classd_dt_init(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct atmel_classd_pdata *pdata;
	const char *pwm_type;
	int ret;

	if (!np) {
		dev_err(dev, "device node not found\n");
		return ERR_PTR(-EINVAL);
	}

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

	ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type);
	if ((ret == 0) && (strcmp(pwm_type, "diff") == 0))
		pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
	else
		pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;

	ret = of_property_read_u32(np,
			"atmel,non-overlap-time", &pdata->non_overlap_time);
	if (ret)
		pdata->non_overlap_enable = false;
	else
		pdata->non_overlap_enable = true;

	ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
	if (ret)
		pdata->card_name = "CLASSD";

	return pdata;
}
#else
static inline struct atmel_classd_pdata *
atmel_classd_dt_init(struct device *dev)
{
	return ERR_PTR(-EINVAL);
}
#endif

#define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
			| SNDRV_PCM_RATE_16000	| SNDRV_PCM_RATE_22050 \
			| SNDRV_PCM_RATE_32000	| SNDRV_PCM_RATE_44100 \
			| SNDRV_PCM_RATE_48000	| SNDRV_PCM_RATE_88200 \
			| SNDRV_PCM_RATE_96000)

static const struct snd_pcm_hardware atmel_classd_hw = {
	.info			= SNDRV_PCM_INFO_MMAP
				| SNDRV_PCM_INFO_MMAP_VALID
				| SNDRV_PCM_INFO_INTERLEAVED
				| SNDRV_PCM_INFO_RESUME
				| SNDRV_PCM_INFO_PAUSE,
	.formats		= (SNDRV_PCM_FMTBIT_S16_LE),
	.rates			= ATMEL_CLASSD_RATES,
	.rate_min		= 8000,
	.rate_max		= 96000,
109
	.channels_min		= 1,
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
	.channels_max		= 2,
	.buffer_bytes_max	= 64 * 1024,
	.period_bytes_min	= 256,
	.period_bytes_max	= 32 * 1024,
	.periods_min		= 2,
	.periods_max		= 256,
};

#define ATMEL_CLASSD_PREALLOC_BUF_SIZE  (64 * 1024)

/* cpu dai component */
static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	regmap_write(dd->regmap, CLASSD_THR, 0x0);

	return clk_prepare_enable(dd->pclk);
}

static void atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	clk_disable_unprepare(dd->pclk);
}

static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
	.startup	= atmel_classd_cpu_dai_startup,
	.shutdown	= atmel_classd_cpu_dai_shutdown,
};

static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
	.playback = {
148
		.channels_min	= 1,
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
		.channels_max	= 2,
		.rates		= ATMEL_CLASSD_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &atmel_classd_cpu_dai_ops,
};

static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
	.name = "atmel-classd",
};

/* platform */
static int
atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	if (params_physical_width(params) != 16) {
		dev_err(rtd->platform->dev,
			"only supports 16-bit audio data\n");
		return -EINVAL;
	}

174 175 176 177 178
	if (params_channels(params) == 1)
		slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	else
		slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;

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
	slave_config->direction		= DMA_MEM_TO_DEV;
	slave_config->dst_addr		= dd->phy_base + CLASSD_THR;
	slave_config->dst_maxburst	= 1;
	slave_config->src_maxburst	= 1;
	slave_config->device_fc		= false;

	return 0;
}

static const struct snd_dmaengine_pcm_config
atmel_classd_dmaengine_pcm_config = {
	.prepare_slave_config	= atmel_classd_platform_configure_dma,
	.pcm_hardware		= &atmel_classd_hw,
	.prealloc_buffer_size	= ATMEL_CLASSD_PREALLOC_BUF_SIZE,
};

/* codec */
static const char * const mono_mode_text[] = {
	"mix", "sat", "left", "right"
};

static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
			CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
			mono_mode_text);

static const char * const eqcfg_text[] = {
	"Treble-12dB", "Treble-6dB",
	"Medium-8dB", "Medium-3dB",
	"Bass-12dB", "Bass-6dB",
	"0 dB",
	"Bass+6dB", "Bass+12dB",
	"Medium+3dB", "Medium+8dB",
	"Treble+6dB", "Treble+12dB",
};

static const unsigned int eqcfg_value[] = {
	CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
	CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
	CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
	CLASSD_INTPMR_EQCFG_FLAT,
	CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
	CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
	CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
};

static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
		CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
		eqcfg_text, eqcfg_value);

static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);

static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
		CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
		78, 1, classd_digital_tlv),

SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
		CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),

SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),

SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),

SOC_ENUM("Mono Mode", classd_mono_mode_enum),

SOC_ENUM("EQ", classd_eqcfg_enum),
};

static const char * const pwm_type[] = {
	"Single ended", "Differential"
};

static int atmel_classd_codec_probe(struct snd_soc_codec *codec)
{
	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
	const struct atmel_classd_pdata *pdata = dd->pdata;
	u32 mask, val;

	mask = CLASSD_MR_PWMTYP_MASK;
	val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;

	mask |= CLASSD_MR_NON_OVERLAP_MASK;
	if (pdata->non_overlap_enable) {
		val |= (CLASSD_MR_NON_OVERLAP_EN
			<< CLASSD_MR_NON_OVERLAP_SHIFT);

		mask |= CLASSD_MR_NOVR_VAL_MASK;
		switch (pdata->non_overlap_time) {
		case 5:
			val |= (CLASSD_MR_NOVR_VAL_5NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 10:
			val |= (CLASSD_MR_NOVR_VAL_10NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 15:
			val |= (CLASSD_MR_NOVR_VAL_15NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		case 20:
			val |= (CLASSD_MR_NOVR_VAL_20NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			break;
		default:
			val |= (CLASSD_MR_NOVR_VAL_10NS
				<< CLASSD_MR_NOVR_VAL_SHIFT);
			dev_warn(codec->dev,
				"non-overlapping value %d is invalid, the default value 10 is specified\n",
				pdata->non_overlap_time);
			break;
		}
	}

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	dev_info(codec->dev,
		"PWM modulation type is %s, non-overlapping is %s\n",
		pwm_type[pdata->pwm_type],
		pdata->non_overlap_enable?"enabled":"disabled");

	return 0;
}

304 305 306 307 308 309 310 311
static int atmel_classd_codec_resume(struct snd_soc_codec *codec)
{
	struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);

	return regcache_sync(dd->regmap);
}

312 313 314 315 316 317 318
static struct regmap *atmel_classd_codec_get_remap(struct device *dev)
{
	return dev_get_regmap(dev, NULL);
}

static struct snd_soc_codec_driver soc_codec_dev_classd = {
	.probe		= atmel_classd_codec_probe,
319
	.resume		= atmel_classd_codec_resume,
320
	.get_regmap	= atmel_classd_codec_get_remap,
321 322 323 324
	.component_driver = {
		.controls		= atmel_classd_snd_controls,
		.num_controls		= ARRAY_SIZE(atmel_classd_snd_controls),
	},
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
};

/* codec dai component */
static int atmel_classd_codec_dai_startup(struct snd_pcm_substream *substream,
				struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	int ret;

	ret = clk_prepare_enable(dd->aclk);
	if (ret)
		return ret;

	return clk_prepare_enable(dd->gclk);
}

static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
	int mute)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u32 mask, val;

	mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;

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

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	return 0;
}

#define CLASSD_ACLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
361
#define CLASSD_ACLK_RATE_12M288_MPY_8  (12288 * 1000 * 8)
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

static struct {
	int rate;
	int sample_rate;
	int dsp_clk;
	unsigned long aclk_rate;
} const sample_rates[] = {
	{ 8000,  CLASSD_INTPMR_FRAME_8K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 16000, CLASSD_INTPMR_FRAME_16K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 32000, CLASSD_INTPMR_FRAME_32K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 48000, CLASSD_INTPMR_FRAME_48K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 96000, CLASSD_INTPMR_FRAME_96K,
	CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
	{ 22050, CLASSD_INTPMR_FRAME_22K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	{ 44100, CLASSD_INTPMR_FRAME_44K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
	{ 88200, CLASSD_INTPMR_FRAME_88K,
	CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
};

static int
atmel_classd_codec_dai_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_codec *codec = codec_dai->codec;
	int fs;
	int i, best, best_val, cur_val, ret;
	u32 mask, val;

	fs = params_rate(params);

	best = 0;
	best_val = abs(fs - sample_rates[0].rate);
	for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
		/* Closest match */
		cur_val = abs(fs - sample_rates[i].rate);
		if (cur_val < best_val) {
			best = i;
			best_val = cur_val;
		}
	}

	dev_dbg(codec->dev,
		"Selected SAMPLE_RATE of %dHz, ACLK_RATE of %ldHz\n",
		sample_rates[best].rate, sample_rates[best].aclk_rate);

	clk_disable_unprepare(dd->gclk);
	clk_disable_unprepare(dd->aclk);

	ret = clk_set_rate(dd->aclk, sample_rates[best].aclk_rate);
	if (ret)
		return ret;

	mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
	val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
	| (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);

	snd_soc_update_bits(codec, CLASSD_INTPMR, mask, val);

	ret = clk_prepare_enable(dd->aclk);
	if (ret)
		return ret;

	return clk_prepare_enable(dd->gclk);
}

static void
atmel_classd_codec_dai_shutdown(struct snd_pcm_substream *substream,
			    struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);

	clk_disable_unprepare(dd->gclk);
	clk_disable_unprepare(dd->aclk);
}

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

	snd_soc_update_bits(codec, CLASSD_MR,
				CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK,
				(CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
				|(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));

	return 0;
}

static int atmel_classd_codec_dai_trigger(struct snd_pcm_substream *substream,
					int cmd, struct snd_soc_dai *codec_dai)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u32 mask, val;

	mask = CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		val = mask;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
			| (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
		break;
	default:
		return -EINVAL;
	}

	snd_soc_update_bits(codec, CLASSD_MR, mask, val);

	return 0;
}

static const struct snd_soc_dai_ops atmel_classd_codec_dai_ops = {
	.digital_mute	= atmel_classd_codec_dai_digital_mute,
	.startup	= atmel_classd_codec_dai_startup,
	.shutdown	= atmel_classd_codec_dai_shutdown,
	.hw_params	= atmel_classd_codec_dai_hw_params,
	.prepare	= atmel_classd_codec_dai_prepare,
	.trigger	= atmel_classd_codec_dai_trigger,
};

#define ATMEL_CLASSD_CODEC_DAI_NAME  "atmel-classd-hifi"

static struct snd_soc_dai_driver atmel_classd_codec_dai = {
	.name = ATMEL_CLASSD_CODEC_DAI_NAME,
	.playback = {
		.stream_name	= "Playback",
504
		.channels_min	= 1,
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
		.channels_max	= 2,
		.rates		= ATMEL_CLASSD_RATES,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &atmel_classd_codec_dai_ops,
};

/* ASoC sound card */
static int atmel_classd_asoc_card_init(struct device *dev,
					struct snd_soc_card *card)
{
	struct snd_soc_dai_link *dai_link;
	struct atmel_classd *dd = snd_soc_card_get_drvdata(card);

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

	dai_link->name			= "CLASSD";
	dai_link->stream_name		= "CLASSD PCM";
	dai_link->codec_dai_name	= ATMEL_CLASSD_CODEC_DAI_NAME;
	dai_link->cpu_dai_name		= dev_name(dev);
	dai_link->codec_name		= dev_name(dev);
	dai_link->platform_name		= dev_name(dev);

	card->dai_link	= dai_link;
	card->num_links	= 1;
	card->name	= dd->pdata->card_name;
	card->dev	= dev;

	return 0;
};

/* regmap configuration */
static const struct reg_default atmel_classd_reg_defaults[] = {
	{ CLASSD_INTPMR,   0x00301212 },
};

#define ATMEL_CLASSD_REG_MAX    0xE4
static const struct regmap_config atmel_classd_regmap_config = {
	.reg_bits	= 32,
	.reg_stride	= 4,
	.val_bits	= 32,
	.max_register	= ATMEL_CLASSD_REG_MAX,

	.cache_type		= REGCACHE_FLAT,
	.reg_defaults		= atmel_classd_reg_defaults,
	.num_reg_defaults	= ARRAY_SIZE(atmel_classd_reg_defaults),
};

static int atmel_classd_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct atmel_classd *dd;
	struct resource *res;
	void __iomem *io_base;
	const struct atmel_classd_pdata *pdata;
	struct snd_soc_card *card;
	int ret;

	pdata = dev_get_platdata(dev);
	if (!pdata) {
		pdata = atmel_classd_dt_init(dev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	}

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

	dd->pdata = pdata;

	dd->irq = platform_get_irq(pdev, 0);
	if (dd->irq < 0) {
		ret = dd->irq;
		dev_err(dev, "failed to could not get irq: %d\n", ret);
		return ret;
	}

	dd->pclk = devm_clk_get(dev, "pclk");
	if (IS_ERR(dd->pclk)) {
		ret = PTR_ERR(dd->pclk);
		dev_err(dev, "failed to get peripheral clock: %d\n", ret);
		return ret;
	}

	dd->gclk = devm_clk_get(dev, "gclk");
	if (IS_ERR(dd->gclk)) {
		ret = PTR_ERR(dd->gclk);
		dev_err(dev, "failed to get GCK clock: %d\n", ret);
		return ret;
	}

	dd->aclk = devm_clk_get(dev, "aclk");
	if (IS_ERR(dd->aclk)) {
		ret = PTR_ERR(dd->aclk);
		dev_err(dev, "failed to get audio clock: %d\n", ret);
		return ret;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	io_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(io_base)) {
		ret =  PTR_ERR(io_base);
		dev_err(dev, "failed to remap register memory: %d\n", ret);
		return ret;
	}

	dd->phy_base = res->start;

	dd->regmap = devm_regmap_init_mmio(dev, io_base,
					&atmel_classd_regmap_config);
	if (IS_ERR(dd->regmap)) {
		ret = PTR_ERR(dd->regmap);
		dev_err(dev, "failed to init register map: %d\n", ret);
		return ret;
	}

	ret = devm_snd_soc_register_component(dev,
					&atmel_classd_cpu_dai_component,
					&atmel_classd_cpu_dai, 1);
	if (ret) {
		dev_err(dev, "could not register CPU DAI: %d\n", ret);
		return ret;
	}

	ret = devm_snd_dmaengine_pcm_register(dev,
					&atmel_classd_dmaengine_pcm_config,
					0);
	if (ret) {
		dev_err(dev, "could not register platform: %d\n", ret);
		return ret;
	}

	ret = snd_soc_register_codec(dev, &soc_codec_dev_classd,
					&atmel_classd_codec_dai, 1);
	if (ret) {
		dev_err(dev, "could not register codec: %d\n", ret);
		return ret;
	}

	/* register sound card */
	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
649 650 651 652
	if (!card) {
		ret = -ENOMEM;
		goto unregister_codec;
	}
653 654 655 656 657 658 659

	snd_soc_card_set_drvdata(card, dd);
	platform_set_drvdata(pdev, card);

	ret = atmel_classd_asoc_card_init(dev, card);
	if (ret) {
		dev_err(dev, "failed to init sound card\n");
660
		goto unregister_codec;
661 662 663 664 665
	}

	ret = devm_snd_soc_register_card(dev, card);
	if (ret) {
		dev_err(dev, "failed to register sound card: %d\n", ret);
666
		goto unregister_codec;
667 668 669
	}

	return 0;
670 671 672 673

unregister_codec:
	snd_soc_unregister_codec(dev);
	return ret;
674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
}

static int atmel_classd_remove(struct platform_device *pdev)
{
	snd_soc_unregister_codec(&pdev->dev);
	return 0;
}

static struct platform_driver atmel_classd_driver = {
	.driver	= {
		.name		= "atmel-classd",
		.of_match_table	= of_match_ptr(atmel_classd_of_match),
		.pm		= &snd_soc_pm_ops,
	},
	.probe	= atmel_classd_probe,
	.remove	= atmel_classd_remove,
};
module_platform_driver(atmel_classd_driver);

MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
MODULE_LICENSE("GPL");