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