sound/soc/atmel/atmel-classd.c

   1 /* Atmel ALSA SoC Audio Class D Amplifier (CLASSD) driver
   2  *
   3  * Copyright (C) 2015 Atmel
   4  *
   5  * Author: Songjun Wu <songjun.wu@atmel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 or later
   9  * as published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/of.h>
  13 #include <linux/clk.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regmap.h>
  17 #include <sound/core.h>
  18 #include <sound/dmaengine_pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/tlv.h>
  21 #include "atmel-classd.h"
  22
  23 struct atmel_classd_pdata {
  24         bool non_overlap_enable;
  25         int non_overlap_time;
  26         int pwm_type;
  27         const char *card_name;
  28 };
  29
  30 struct atmel_classd {
  31         dma_addr_t phy_base;
  32         struct regmap *regmap;
  33         struct clk *pclk;
  34         struct clk *gclk;
  35         struct device *dev;
  36         int irq;
  37         const struct atmel_classd_pdata *pdata;
  38 };
  39
  40 #ifdef CONFIG_OF
  41 static const struct of_device_id atmel_classd_of_match[] = {
  42         {
  43                 .compatible = "atmel,sama5d2-classd",
  44         }, {
  45                 /* sentinel */
  46         }
  47 };
  48 MODULE_DEVICE_TABLE(of, atmel_classd_of_match);
  49
  50 static struct atmel_classd_pdata *atmel_classd_dt_init(struct device *dev)
  51 {
  52         struct device_node *np = dev->of_node;
  53         struct atmel_classd_pdata *pdata;
  54         const char *pwm_type;
  55         int ret;
  56
  57         if (!np) {
  58                 dev_err(dev, "device node not found\n");
  59                 return ERR_PTR(-EINVAL);
  60         }
  61
  62         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
  63         if (!pdata)
  64                 return ERR_PTR(-ENOMEM);
  65
  66         ret = of_property_read_string(np, "atmel,pwm-type", &pwm_type);
  67         if ((ret == 0) && (strcmp(pwm_type, "diff") == 0))
  68                 pdata->pwm_type = CLASSD_MR_PWMTYP_DIFF;
  69         else
  70                 pdata->pwm_type = CLASSD_MR_PWMTYP_SINGLE;
  71
  72         ret = of_property_read_u32(np,
  73                         "atmel,non-overlap-time", &pdata->non_overlap_time);
  74         if (ret)
  75                 pdata->non_overlap_enable = false;
  76         else
  77                 pdata->non_overlap_enable = true;
  78
  79         ret = of_property_read_string(np, "atmel,model", &pdata->card_name);
  80         if (ret)
  81                 pdata->card_name = "CLASSD";
  82
  83         return pdata;
  84 }
  85 #else
  86 static inline struct atmel_classd_pdata *
  87 atmel_classd_dt_init(struct device *dev)
  88 {
  89         return ERR_PTR(-EINVAL);
  90 }
  91 #endif
  92
  93 #define ATMEL_CLASSD_RATES (SNDRV_PCM_RATE_8000 \
  94                         | SNDRV_PCM_RATE_16000  | SNDRV_PCM_RATE_22050 \
  95                         | SNDRV_PCM_RATE_32000  | SNDRV_PCM_RATE_44100 \
  96                         | SNDRV_PCM_RATE_48000  | SNDRV_PCM_RATE_88200 \
  97                         | SNDRV_PCM_RATE_96000)
  98
  99 static const struct snd_pcm_hardware atmel_classd_hw = {
 100         .info                   = SNDRV_PCM_INFO_MMAP
 101                                 | SNDRV_PCM_INFO_MMAP_VALID
 102                                 | SNDRV_PCM_INFO_INTERLEAVED
 103                                 | SNDRV_PCM_INFO_RESUME
 104                                 | SNDRV_PCM_INFO_PAUSE,
 105         .formats                = (SNDRV_PCM_FMTBIT_S16_LE),
 106         .rates                  = ATMEL_CLASSD_RATES,
 107         .rate_min               = 8000,
 108         .rate_max               = 96000,
 109         .channels_min           = 1,
 110         .channels_max           = 2,
 111         .buffer_bytes_max       = 64 * 1024,
 112         .period_bytes_min       = 256,
 113         .period_bytes_max       = 32 * 1024,
 114         .periods_min            = 2,
 115         .periods_max            = 256,
 116 };
 117
 118 #define ATMEL_CLASSD_PREALLOC_BUF_SIZE  (64 * 1024)
 119
 120 /* cpu dai component */
 121 static int atmel_classd_cpu_dai_startup(struct snd_pcm_substream *substream,
 122                                         struct snd_soc_dai *cpu_dai)
 123 {
 124         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 125         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 126
 127         regmap_write(dd->regmap, CLASSD_THR, 0x0);
 128
 129         return clk_prepare_enable(dd->pclk);
 130 }
 131
 132 static void atmel_classd_cpu_dai_shutdown(struct snd_pcm_substream *substream,
 133                                         struct snd_soc_dai *cpu_dai)
 134 {
 135         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 136         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 137
 138         clk_disable_unprepare(dd->pclk);
 139 }
 140
 141 static const struct snd_soc_dai_ops atmel_classd_cpu_dai_ops = {
 142         .startup        = atmel_classd_cpu_dai_startup,
 143         .shutdown       = atmel_classd_cpu_dai_shutdown,
 144 };
 145
 146 static struct snd_soc_dai_driver atmel_classd_cpu_dai = {
 147         .playback = {
 148                 .channels_min   = 1,
 149                 .channels_max   = 2,
 150                 .rates          = ATMEL_CLASSD_RATES,
 151                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,},
 152         .ops = &atmel_classd_cpu_dai_ops,
 153 };
 154
 155 static const struct snd_soc_component_driver atmel_classd_cpu_dai_component = {
 156         .name = "atmel-classd",
 157 };
 158
 159 /* platform */
 160 static int
 161 atmel_classd_platform_configure_dma(struct snd_pcm_substream *substream,
 162         struct snd_pcm_hw_params *params,
 163         struct dma_slave_config *slave_config)
 164 {
 165         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 166         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 167
 168         if (params_physical_width(params) != 16) {
 169                 dev_err(dd->dev,
 170                         "only supports 16-bit audio data\n");
 171                 return -EINVAL;
 172         }
 173
 174         if (params_channels(params) == 1)
 175                 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 176         else
 177                 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 178
 179         slave_config->direction         = DMA_MEM_TO_DEV;
 180         slave_config->dst_addr          = dd->phy_base + CLASSD_THR;
 181         slave_config->dst_maxburst      = 1;
 182         slave_config->src_maxburst      = 1;
 183         slave_config->device_fc         = false;
 184
 185         return 0;
 186 }
 187
 188 static const struct snd_dmaengine_pcm_config
 189 atmel_classd_dmaengine_pcm_config = {
 190         .prepare_slave_config   = atmel_classd_platform_configure_dma,
 191         .pcm_hardware           = &atmel_classd_hw,
 192         .prealloc_buffer_size   = ATMEL_CLASSD_PREALLOC_BUF_SIZE,
 193 };
 194
 195 /* codec */
 196 static const char * const mono_mode_text[] = {
 197         "mix", "sat", "left", "right"
 198 };
 199
 200 static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
 201                         CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
 202                         mono_mode_text);
 203
 204 static const char * const eqcfg_text[] = {
 205         "Treble-12dB", "Treble-6dB",
 206         "Medium-8dB", "Medium-3dB",
 207         "Bass-12dB", "Bass-6dB",
 208         "0 dB",
 209         "Bass+6dB", "Bass+12dB",
 210         "Medium+3dB", "Medium+8dB",
 211         "Treble+6dB", "Treble+12dB",
 212 };
 213
 214 static const unsigned int eqcfg_value[] = {
 215         CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
 216         CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
 217         CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
 218         CLASSD_INTPMR_EQCFG_FLAT,
 219         CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
 220         CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
 221         CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
 222 };
 223
 224 static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
 225                 CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
 226                 eqcfg_text, eqcfg_value);
 227
 228 static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);
 229
 230 static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
 231 SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
 232                 CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
 233                 78, 1, classd_digital_tlv),
 234
 235 SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
 236                 CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),
 237
 238 SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),
 239
 240 SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),
 241
 242 SOC_ENUM("Mono Mode", classd_mono_mode_enum),
 243
 244 SOC_ENUM("EQ", classd_eqcfg_enum),
 245 };
 246
 247 static const char * const pwm_type[] = {
 248         "Single ended", "Differential"
 249 };
 250
 251 static int atmel_classd_component_probe(struct snd_soc_component *component)
 252 {
 253         struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
 254         struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
 255         const struct atmel_classd_pdata *pdata = dd->pdata;
 256         u32 mask, val;
 257
 258         mask = CLASSD_MR_PWMTYP_MASK;
 259         val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;
 260
 261         mask |= CLASSD_MR_NON_OVERLAP_MASK;
 262         if (pdata->non_overlap_enable) {
 263                 val |= (CLASSD_MR_NON_OVERLAP_EN
 264                         << CLASSD_MR_NON_OVERLAP_SHIFT);
 265
 266                 mask |= CLASSD_MR_NOVR_VAL_MASK;
 267                 switch (pdata->non_overlap_time) {
 268                 case 5:
 269                         val |= (CLASSD_MR_NOVR_VAL_5NS
 270                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 271                         break;
 272                 case 10:
 273                         val |= (CLASSD_MR_NOVR_VAL_10NS
 274                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 275                         break;
 276                 case 15:
 277                         val |= (CLASSD_MR_NOVR_VAL_15NS
 278                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 279                         break;
 280                 case 20:
 281                         val |= (CLASSD_MR_NOVR_VAL_20NS
 282                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 283                         break;
 284                 default:
 285                         val |= (CLASSD_MR_NOVR_VAL_10NS
 286                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 287                         dev_warn(component->dev,
 288                                 "non-overlapping value %d is invalid, the default value 10 is specified\n",
 289                                 pdata->non_overlap_time);
 290                         break;
 291                 }
 292         }
 293
 294         snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
 295
 296         dev_info(component->dev,
 297                 "PWM modulation type is %s, non-overlapping is %s\n",
 298                 pwm_type[pdata->pwm_type],
 299                 pdata->non_overlap_enable?"enabled":"disabled");
 300
 301         return 0;
 302 }
 303
 304 static int atmel_classd_component_resume(struct snd_soc_component *component)
 305 {
 306         struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
 307         struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
 308
 309         return regcache_sync(dd->regmap);
 310 }
 311
 312 static struct snd_soc_component_driver soc_component_dev_classd = {
 313         .probe                  = atmel_classd_component_probe,
 314         .resume                 = atmel_classd_component_resume,
 315         .controls               = atmel_classd_snd_controls,
 316         .num_controls           = ARRAY_SIZE(atmel_classd_snd_controls),
 317         .idle_bias_on           = 1,
 318         .use_pmdown_time        = 1,
 319         .endianness             = 1,
 320         .non_legacy_dai_naming  = 1,
 321 };
 322
 323 /* codec dai component */
 324 static int atmel_classd_codec_dai_startup(struct snd_pcm_substream *substream,
 325                                 struct snd_soc_dai *codec_dai)
 326 {
 327         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 328         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 329
 330         return clk_prepare_enable(dd->gclk);
 331 }
 332
 333 static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
 334         int mute)
 335 {
 336         struct snd_soc_component *component = codec_dai->component;
 337         u32 mask, val;
 338
 339         mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;
 340
 341         if (mute)
 342                 val = mask;
 343         else
 344                 val = 0;
 345
 346         snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
 347
 348         return 0;
 349 }
 350
 351 #define CLASSD_GCLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
 352 #define CLASSD_GCLK_RATE_12M288_MPY_8  (12288 * 1000 * 8)
 353
 354 static struct {
 355         int rate;
 356         int sample_rate;
 357         int dsp_clk;
 358         unsigned long gclk_rate;
 359 } const sample_rates[] = {
 360         { 8000,  CLASSD_INTPMR_FRAME_8K,
 361         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
 362         { 16000, CLASSD_INTPMR_FRAME_16K,
 363         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
 364         { 32000, CLASSD_INTPMR_FRAME_32K,
 365         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
 366         { 48000, CLASSD_INTPMR_FRAME_48K,
 367         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
 368         { 96000, CLASSD_INTPMR_FRAME_96K,
 369         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_GCLK_RATE_12M288_MPY_8 },
 370         { 22050, CLASSD_INTPMR_FRAME_22K,
 371         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
 372         { 44100, CLASSD_INTPMR_FRAME_44K,
 373         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
 374         { 88200, CLASSD_INTPMR_FRAME_88K,
 375         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_GCLK_RATE_11M2896_MPY_8 },
 376 };
 377
 378 static int
 379 atmel_classd_codec_dai_hw_params(struct snd_pcm_substream *substream,
 380                             struct snd_pcm_hw_params *params,
 381                             struct snd_soc_dai *codec_dai)
 382 {
 383         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 384         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 385         struct snd_soc_component *component = codec_dai->component;
 386         int fs;
 387         int i, best, best_val, cur_val, ret;
 388         u32 mask, val;
 389
 390         fs = params_rate(params);
 391
 392         best = 0;
 393         best_val = abs(fs - sample_rates[0].rate);
 394         for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
 395                 /* Closest match */
 396                 cur_val = abs(fs - sample_rates[i].rate);
 397                 if (cur_val < best_val) {
 398                         best = i;
 399                         best_val = cur_val;
 400                 }
 401         }
 402
 403         dev_dbg(component->dev,
 404                 "Selected SAMPLE_RATE of %dHz, GCLK_RATE of %ldHz\n",
 405                 sample_rates[best].rate, sample_rates[best].gclk_rate);
 406
 407         clk_disable_unprepare(dd->gclk);
 408
 409         ret = clk_set_rate(dd->gclk, sample_rates[best].gclk_rate);
 410         if (ret)
 411                 return ret;
 412
 413         mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
 414         val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
 415         | (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);
 416
 417         snd_soc_component_update_bits(component, CLASSD_INTPMR, mask, val);
 418
 419         return clk_prepare_enable(dd->gclk);
 420 }
 421
 422 static void
 423 atmel_classd_codec_dai_shutdown(struct snd_pcm_substream *substream,
 424                             struct snd_soc_dai *codec_dai)
 425 {
 426         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 427         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 428
 429         clk_disable_unprepare(dd->gclk);
 430 }
 431
 432 static int atmel_classd_codec_dai_prepare(struct snd_pcm_substream *substream,
 433                                         struct snd_soc_dai *codec_dai)
 434 {
 435         struct snd_soc_component *component = codec_dai->component;
 436
 437         snd_soc_component_update_bits(component, CLASSD_MR,
 438                                 CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK,
 439                                 (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
 440                                 |(CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT));
 441
 442         return 0;
 443 }
 444
 445 static int atmel_classd_codec_dai_trigger(struct snd_pcm_substream *substream,
 446                                         int cmd, struct snd_soc_dai *codec_dai)
 447 {
 448         struct snd_soc_component *component = codec_dai->component;
 449         u32 mask, val;
 450
 451         mask = CLASSD_MR_LEN_MASK | CLASSD_MR_REN_MASK;
 452
 453         switch (cmd) {
 454         case SNDRV_PCM_TRIGGER_START:
 455         case SNDRV_PCM_TRIGGER_RESUME:
 456         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 457                 val = mask;
 458                 break;
 459         case SNDRV_PCM_TRIGGER_STOP:
 460         case SNDRV_PCM_TRIGGER_SUSPEND:
 461         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 462                 val = (CLASSD_MR_LEN_DIS << CLASSD_MR_LEN_SHIFT)
 463                         | (CLASSD_MR_REN_DIS << CLASSD_MR_REN_SHIFT);
 464                 break;
 465         default:
 466                 return -EINVAL;
 467         }
 468
 469         snd_soc_component_update_bits(component, CLASSD_MR, mask, val);
 470
 471         return 0;
 472 }
 473
 474 static const struct snd_soc_dai_ops atmel_classd_codec_dai_ops = {
 475         .digital_mute   = atmel_classd_codec_dai_digital_mute,
 476         .startup        = atmel_classd_codec_dai_startup,
 477         .shutdown       = atmel_classd_codec_dai_shutdown,
 478         .hw_params      = atmel_classd_codec_dai_hw_params,
 479         .prepare        = atmel_classd_codec_dai_prepare,
 480         .trigger        = atmel_classd_codec_dai_trigger,
 481 };
 482
 483 #define ATMEL_CLASSD_CODEC_DAI_NAME  "atmel-classd-hifi"
 484
 485 static struct snd_soc_dai_driver atmel_classd_codec_dai = {
 486         .name = ATMEL_CLASSD_CODEC_DAI_NAME,
 487         .playback = {
 488                 .stream_name    = "Playback",
 489                 .channels_min   = 1,
 490                 .channels_max   = 2,
 491                 .rates          = ATMEL_CLASSD_RATES,
 492                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,
 493         },
 494         .ops = &atmel_classd_codec_dai_ops,
 495 };
 496
 497 /* ASoC sound card */
 498 static int atmel_classd_asoc_card_init(struct device *dev,
 499                                         struct snd_soc_card *card)
 500 {
 501         struct snd_soc_dai_link *dai_link;
 502         struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
 503
 504         dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
 505         if (!dai_link)
 506                 return -ENOMEM;
 507
 508         dai_link->name                  = "CLASSD";
 509         dai_link->stream_name           = "CLASSD PCM";
 510         dai_link->codec_dai_name        = ATMEL_CLASSD_CODEC_DAI_NAME;
 511         dai_link->cpu_dai_name          = dev_name(dev);
 512         dai_link->codec_name            = dev_name(dev);
 513         dai_link->platform_name         = dev_name(dev);
 514
 515         card->dai_link  = dai_link;
 516         card->num_links = 1;
 517         card->name      = dd->pdata->card_name;
 518         card->dev       = dev;
 519
 520         return 0;
 521 };
 522
 523 /* regmap configuration */
 524 static const struct reg_default atmel_classd_reg_defaults[] = {
 525         { CLASSD_INTPMR,   0x00301212 },
 526 };
 527
 528 #define ATMEL_CLASSD_REG_MAX    0xE4
 529 static const struct regmap_config atmel_classd_regmap_config = {
 530         .reg_bits       = 32,
 531         .reg_stride     = 4,
 532         .val_bits       = 32,
 533         .max_register   = ATMEL_CLASSD_REG_MAX,
 534
 535         .cache_type             = REGCACHE_FLAT,
 536         .reg_defaults           = atmel_classd_reg_defaults,
 537         .num_reg_defaults       = ARRAY_SIZE(atmel_classd_reg_defaults),
 538 };
 539
 540 static int atmel_classd_probe(struct platform_device *pdev)
 541 {
 542         struct device *dev = &pdev->dev;
 543         struct atmel_classd *dd;
 544         struct resource *res;
 545         void __iomem *io_base;
 546         const struct atmel_classd_pdata *pdata;
 547         struct snd_soc_card *card;
 548         int ret;
 549
 550         pdata = dev_get_platdata(dev);
 551         if (!pdata) {
 552                 pdata = atmel_classd_dt_init(dev);
 553                 if (IS_ERR(pdata))
 554                         return PTR_ERR(pdata);
 555         }
 556
 557         dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
 558         if (!dd)
 559                 return -ENOMEM;
 560
 561         dd->pdata = pdata;
 562
 563         dd->irq = platform_get_irq(pdev, 0);
 564         if (dd->irq < 0) {
 565                 ret = dd->irq;
 566                 dev_err(dev, "failed to could not get irq: %d\n", ret);
 567                 return ret;
 568         }
 569
 570         dd->pclk = devm_clk_get(dev, "pclk");
 571         if (IS_ERR(dd->pclk)) {
 572                 ret = PTR_ERR(dd->pclk);
 573                 dev_err(dev, "failed to get peripheral clock: %d\n", ret);
 574                 return ret;
 575         }
 576
 577         dd->gclk = devm_clk_get(dev, "gclk");
 578         if (IS_ERR(dd->gclk)) {
 579                 ret = PTR_ERR(dd->gclk);
 580                 dev_err(dev, "failed to get GCK clock: %d\n", ret);
 581                 return ret;
 582         }
 583
 584         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 585         io_base = devm_ioremap_resource(dev, res);
 586         if (IS_ERR(io_base))
 587                 return PTR_ERR(io_base);
 588
 589         dd->phy_base = res->start;
 590         dd->dev = dev;
 591
 592         dd->regmap = devm_regmap_init_mmio(dev, io_base,
 593                                         &atmel_classd_regmap_config);
 594         if (IS_ERR(dd->regmap)) {
 595                 ret = PTR_ERR(dd->regmap);
 596                 dev_err(dev, "failed to init register map: %d\n", ret);
 597                 return ret;
 598         }
 599
 600         ret = devm_snd_soc_register_component(dev,
 601                                         &atmel_classd_cpu_dai_component,
 602                                         &atmel_classd_cpu_dai, 1);
 603         if (ret) {
 604                 dev_err(dev, "could not register CPU DAI: %d\n", ret);
 605                 return ret;
 606         }
 607
 608         ret = devm_snd_dmaengine_pcm_register(dev,
 609                                         &atmel_classd_dmaengine_pcm_config,
 610                                         0);
 611         if (ret) {
 612                 dev_err(dev, "could not register platform: %d\n", ret);
 613                 return ret;
 614         }
 615
 616         ret = devm_snd_soc_register_component(dev, &soc_component_dev_classd,
 617                                         &atmel_classd_codec_dai, 1);
 618         if (ret) {
 619                 dev_err(dev, "could not register component: %d\n", ret);
 620                 return ret;
 621         }
 622
 623         /* register sound card */
 624         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 625         if (!card) {
 626                 ret = -ENOMEM;
 627                 goto unregister_codec;
 628         }
 629
 630         snd_soc_card_set_drvdata(card, dd);
 631
 632         ret = atmel_classd_asoc_card_init(dev, card);
 633         if (ret) {
 634                 dev_err(dev, "failed to init sound card\n");
 635                 goto unregister_codec;
 636         }
 637
 638         ret = devm_snd_soc_register_card(dev, card);
 639         if (ret) {
 640                 dev_err(dev, "failed to register sound card: %d\n", ret);
 641                 goto unregister_codec;
 642         }
 643
 644         return 0;
 645
 646 unregister_codec:
 647         return ret;
 648 }
 649
 650 static int atmel_classd_remove(struct platform_device *pdev)
 651 {
 652         return 0;
 653 }
 654
 655 static struct platform_driver atmel_classd_driver = {
 656         .driver = {
 657                 .name           = "atmel-classd",
 658                 .of_match_table = of_match_ptr(atmel_classd_of_match),
 659                 .pm             = &snd_soc_pm_ops,
 660         },
 661         .probe  = atmel_classd_probe,
 662         .remove = atmel_classd_remove,
 663 };
 664 module_platform_driver(atmel_classd_driver);
 665
 666 MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
 667 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
 668 MODULE_LICENSE("GPL");