kernel/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 clk *aclk;
  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           = 2,
 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   = 2,
 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(rtd->platform->dev,
 170                         "only supports 16-bit audio data\n");
 171                 return -EINVAL;
 172         }
 173
 174         slave_config->direction         = DMA_MEM_TO_DEV;
 175         slave_config->dst_addr          = dd->phy_base + CLASSD_THR;
 176         slave_config->dst_addr_width    = DMA_SLAVE_BUSWIDTH_4_BYTES;
 177         slave_config->dst_maxburst      = 1;
 178         slave_config->src_maxburst      = 1;
 179         slave_config->device_fc         = false;
 180
 181         return 0;
 182 }
 183
 184 static const struct snd_dmaengine_pcm_config
 185 atmel_classd_dmaengine_pcm_config = {
 186         .prepare_slave_config   = atmel_classd_platform_configure_dma,
 187         .pcm_hardware           = &atmel_classd_hw,
 188         .prealloc_buffer_size   = ATMEL_CLASSD_PREALLOC_BUF_SIZE,
 189 };
 190
 191 /* codec */
 192 static const char * const mono_mode_text[] = {
 193         "mix", "sat", "left", "right"
 194 };
 195
 196 static SOC_ENUM_SINGLE_DECL(classd_mono_mode_enum,
 197                         CLASSD_INTPMR, CLASSD_INTPMR_MONO_MODE_SHIFT,
 198                         mono_mode_text);
 199
 200 static const char * const eqcfg_text[] = {
 201         "Treble-12dB", "Treble-6dB",
 202         "Medium-8dB", "Medium-3dB",
 203         "Bass-12dB", "Bass-6dB",
 204         "0 dB",
 205         "Bass+6dB", "Bass+12dB",
 206         "Medium+3dB", "Medium+8dB",
 207         "Treble+6dB", "Treble+12dB",
 208 };
 209
 210 static const unsigned int eqcfg_value[] = {
 211         CLASSD_INTPMR_EQCFG_T_CUT_12, CLASSD_INTPMR_EQCFG_T_CUT_6,
 212         CLASSD_INTPMR_EQCFG_M_CUT_8, CLASSD_INTPMR_EQCFG_M_CUT_3,
 213         CLASSD_INTPMR_EQCFG_B_CUT_12, CLASSD_INTPMR_EQCFG_B_CUT_6,
 214         CLASSD_INTPMR_EQCFG_FLAT,
 215         CLASSD_INTPMR_EQCFG_B_BOOST_6, CLASSD_INTPMR_EQCFG_B_BOOST_12,
 216         CLASSD_INTPMR_EQCFG_M_BOOST_3, CLASSD_INTPMR_EQCFG_M_BOOST_8,
 217         CLASSD_INTPMR_EQCFG_T_BOOST_6, CLASSD_INTPMR_EQCFG_T_BOOST_12,
 218 };
 219
 220 static SOC_VALUE_ENUM_SINGLE_DECL(classd_eqcfg_enum,
 221                 CLASSD_INTPMR, CLASSD_INTPMR_EQCFG_SHIFT, 0xf,
 222                 eqcfg_text, eqcfg_value);
 223
 224 static const DECLARE_TLV_DB_SCALE(classd_digital_tlv, -7800, 100, 1);
 225
 226 static const struct snd_kcontrol_new atmel_classd_snd_controls[] = {
 227 SOC_DOUBLE_TLV("Playback Volume", CLASSD_INTPMR,
 228                 CLASSD_INTPMR_ATTL_SHIFT, CLASSD_INTPMR_ATTR_SHIFT,
 229                 78, 1, classd_digital_tlv),
 230
 231 SOC_SINGLE("Deemphasis Switch", CLASSD_INTPMR,
 232                 CLASSD_INTPMR_DEEMP_SHIFT, 1, 0),
 233
 234 SOC_SINGLE("Mono Switch", CLASSD_INTPMR, CLASSD_INTPMR_MONO_SHIFT, 1, 0),
 235
 236 SOC_SINGLE("Swap Switch", CLASSD_INTPMR, CLASSD_INTPMR_SWAP_SHIFT, 1, 0),
 237
 238 SOC_ENUM("Mono Mode", classd_mono_mode_enum),
 239
 240 SOC_ENUM("EQ", classd_eqcfg_enum),
 241 };
 242
 243 static const char * const pwm_type[] = {
 244         "Single ended", "Differential"
 245 };
 246
 247 static int atmel_classd_codec_probe(struct snd_soc_codec *codec)
 248 {
 249         struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
 250         struct atmel_classd *dd = snd_soc_card_get_drvdata(card);
 251         const struct atmel_classd_pdata *pdata = dd->pdata;
 252         u32 mask, val;
 253
 254         mask = CLASSD_MR_PWMTYP_MASK;
 255         val = pdata->pwm_type << CLASSD_MR_PWMTYP_SHIFT;
 256
 257         mask |= CLASSD_MR_NON_OVERLAP_MASK;
 258         if (pdata->non_overlap_enable) {
 259                 val |= (CLASSD_MR_NON_OVERLAP_EN
 260                         << CLASSD_MR_NON_OVERLAP_SHIFT);
 261
 262                 mask |= CLASSD_MR_NOVR_VAL_MASK;
 263                 switch (pdata->non_overlap_time) {
 264                 case 5:
 265                         val |= (CLASSD_MR_NOVR_VAL_5NS
 266                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 267                         break;
 268                 case 10:
 269                         val |= (CLASSD_MR_NOVR_VAL_10NS
 270                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 271                         break;
 272                 case 15:
 273                         val |= (CLASSD_MR_NOVR_VAL_15NS
 274                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 275                         break;
 276                 case 20:
 277                         val |= (CLASSD_MR_NOVR_VAL_20NS
 278                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 279                         break;
 280                 default:
 281                         val |= (CLASSD_MR_NOVR_VAL_10NS
 282                                 << CLASSD_MR_NOVR_VAL_SHIFT);
 283                         dev_warn(codec->dev,
 284                                 "non-overlapping value %d is invalid, the default value 10 is specified\n",
 285                                 pdata->non_overlap_time);
 286                         break;
 287                 }
 288         }
 289
 290         snd_soc_update_bits(codec, CLASSD_MR, mask, val);
 291
 292         dev_info(codec->dev,
 293                 "PWM modulation type is %s, non-overlapping is %s\n",
 294                 pwm_type[pdata->pwm_type],
 295                 pdata->non_overlap_enable?"enabled":"disabled");
 296
 297         return 0;
 298 }
 299
 300 static struct regmap *atmel_classd_codec_get_remap(struct device *dev)
 301 {
 302         return dev_get_regmap(dev, NULL);
 303 }
 304
 305 static struct snd_soc_codec_driver soc_codec_dev_classd = {
 306         .probe          = atmel_classd_codec_probe,
 307         .controls       = atmel_classd_snd_controls,
 308         .num_controls   = ARRAY_SIZE(atmel_classd_snd_controls),
 309         .get_regmap     = atmel_classd_codec_get_remap,
 310 };
 311
 312 /* codec dai component */
 313 static int atmel_classd_codec_dai_startup(struct snd_pcm_substream *substream,
 314                                 struct snd_soc_dai *codec_dai)
 315 {
 316         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 317         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 318         int ret;
 319
 320         ret = clk_prepare_enable(dd->aclk);
 321         if (ret)
 322                 return ret;
 323
 324         return clk_prepare_enable(dd->gclk);
 325 }
 326
 327 static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
 328         int mute)
 329 {
 330         struct snd_soc_codec *codec = codec_dai->codec;
 331         u32 mask, val;
 332
 333         mask = CLASSD_MR_LMUTE_MASK | CLASSD_MR_RMUTE_MASK;
 334
 335         if (mute)
 336                 val = mask;
 337         else
 338                 val = 0;
 339
 340         snd_soc_update_bits(codec, CLASSD_MR, mask, val);
 341
 342         return 0;
 343 }
 344
 345 #define CLASSD_ACLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
 346 #define CLASSD_ACLK_RATE_12M288_MPY_8  (12228 * 1000 * 8)
 347
 348 static struct {
 349         int rate;
 350         int sample_rate;
 351         int dsp_clk;
 352         unsigned long aclk_rate;
 353 } const sample_rates[] = {
 354         { 8000,  CLASSD_INTPMR_FRAME_8K,
 355         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
 356         { 16000, CLASSD_INTPMR_FRAME_16K,
 357         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
 358         { 32000, CLASSD_INTPMR_FRAME_32K,
 359         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
 360         { 48000, CLASSD_INTPMR_FRAME_48K,
 361         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
 362         { 96000, CLASSD_INTPMR_FRAME_96K,
 363         CLASSD_INTPMR_DSP_CLK_FREQ_12M288, CLASSD_ACLK_RATE_12M288_MPY_8 },
 364         { 22050, CLASSD_INTPMR_FRAME_22K,
 365         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
 366         { 44100, CLASSD_INTPMR_FRAME_44K,
 367         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
 368         { 88200, CLASSD_INTPMR_FRAME_88K,
 369         CLASSD_INTPMR_DSP_CLK_FREQ_11M2896, CLASSD_ACLK_RATE_11M2896_MPY_8 },
 370 };
 371
 372 static int
 373 atmel_classd_codec_dai_hw_params(struct snd_pcm_substream *substream,
 374                             struct snd_pcm_hw_params *params,
 375                             struct snd_soc_dai *codec_dai)
 376 {
 377         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 378         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 379         struct snd_soc_codec *codec = codec_dai->codec;
 380         int fs;
 381         int i, best, best_val, cur_val, ret;
 382         u32 mask, val;
 383
 384         fs = params_rate(params);
 385
 386         best = 0;
 387         best_val = abs(fs - sample_rates[0].rate);
 388         for (i = 1; i < ARRAY_SIZE(sample_rates); i++) {
 389                 /* Closest match */
 390                 cur_val = abs(fs - sample_rates[i].rate);
 391                 if (cur_val < best_val) {
 392                         best = i;
 393                         best_val = cur_val;
 394                 }
 395         }
 396
 397         dev_dbg(codec->dev,
 398                 "Selected SAMPLE_RATE of %dHz, ACLK_RATE of %ldHz\n",
 399                 sample_rates[best].rate, sample_rates[best].aclk_rate);
 400
 401         clk_disable_unprepare(dd->gclk);
 402         clk_disable_unprepare(dd->aclk);
 403
 404         ret = clk_set_rate(dd->aclk, sample_rates[best].aclk_rate);
 405         if (ret)
 406                 return ret;
 407
 408         mask = CLASSD_INTPMR_DSP_CLK_FREQ_MASK | CLASSD_INTPMR_FRAME_MASK;
 409         val = (sample_rates[best].dsp_clk << CLASSD_INTPMR_DSP_CLK_FREQ_SHIFT)
 410         | (sample_rates[best].sample_rate << CLASSD_INTPMR_FRAME_SHIFT);
 411
 412         snd_soc_update_bits(codec, CLASSD_INTPMR, mask, val);
 413
 414         ret = clk_prepare_enable(dd->aclk);
 415         if (ret)
 416                 return ret;
 417
 418         return clk_prepare_enable(dd->gclk);
 419 }
 420
 421 static void
 422 atmel_classd_codec_dai_shutdown(struct snd_pcm_substream *substream,
 423                             struct snd_soc_dai *codec_dai)
 424 {
 425         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 426         struct atmel_classd *dd = snd_soc_card_get_drvdata(rtd->card);
 427
 428         clk_disable_unprepare(dd->gclk);
 429         clk_disable_unprepare(dd->aclk);
 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_codec *codec = codec_dai->codec;
 436
 437         snd_soc_update_bits(codec, 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_codec *codec = codec_dai->codec;
 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_update_bits(codec, 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   = 2,
 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         dd->aclk = devm_clk_get(dev, "aclk");
 585         if (IS_ERR(dd->aclk)) {
 586                 ret = PTR_ERR(dd->aclk);
 587                 dev_err(dev, "failed to get audio clock: %d\n", ret);
 588                 return ret;
 589         }
 590
 591         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 592         if (!res) {
 593                 dev_err(dev, "no memory resource\n");
 594                 return -ENXIO;
 595         }
 596
 597         io_base = devm_ioremap_resource(dev, res);
 598         if (IS_ERR(io_base)) {
 599                 ret =  PTR_ERR(io_base);
 600                 dev_err(dev, "failed to remap register memory: %d\n", ret);
 601                 return ret;
 602         }
 603
 604         dd->phy_base = res->start;
 605
 606         dd->regmap = devm_regmap_init_mmio(dev, io_base,
 607                                         &atmel_classd_regmap_config);
 608         if (IS_ERR(dd->regmap)) {
 609                 ret = PTR_ERR(dd->regmap);
 610                 dev_err(dev, "failed to init register map: %d\n", ret);
 611                 return ret;
 612         }
 613
 614         ret = devm_snd_soc_register_component(dev,
 615                                         &atmel_classd_cpu_dai_component,
 616                                         &atmel_classd_cpu_dai, 1);
 617         if (ret) {
 618                 dev_err(dev, "could not register CPU DAI: %d\n", ret);
 619                 return ret;
 620         }
 621
 622         ret = devm_snd_dmaengine_pcm_register(dev,
 623                                         &atmel_classd_dmaengine_pcm_config,
 624                                         0);
 625         if (ret) {
 626                 dev_err(dev, "could not register platform: %d\n", ret);
 627                 return ret;
 628         }
 629
 630         ret = snd_soc_register_codec(dev, &soc_codec_dev_classd,
 631                                         &atmel_classd_codec_dai, 1);
 632         if (ret) {
 633                 dev_err(dev, "could not register codec: %d\n", ret);
 634                 return ret;
 635         }
 636
 637         /* register sound card */
 638         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 639         if (!card)
 640                 return -ENOMEM;
 641
 642         snd_soc_card_set_drvdata(card, dd);
 643         platform_set_drvdata(pdev, card);
 644
 645         ret = atmel_classd_asoc_card_init(dev, card);
 646         if (ret) {
 647                 dev_err(dev, "failed to init sound card\n");
 648                 return ret;
 649         }
 650
 651         ret = devm_snd_soc_register_card(dev, card);
 652         if (ret) {
 653                 dev_err(dev, "failed to register sound card: %d\n", ret);
 654                 return ret;
 655         }
 656
 657         return 0;
 658 }
 659
 660 static int atmel_classd_remove(struct platform_device *pdev)
 661 {
 662         snd_soc_unregister_codec(&pdev->dev);
 663         return 0;
 664 }
 665
 666 static struct platform_driver atmel_classd_driver = {
 667         .driver = {
 668                 .name           = "atmel-classd",
 669                 .of_match_table = of_match_ptr(atmel_classd_of_match),
 670                 .pm             = &snd_soc_pm_ops,
 671         },
 672         .probe  = atmel_classd_probe,
 673         .remove = atmel_classd_remove,
 674 };
 675 module_platform_driver(atmel_classd_driver);
 676
 677 MODULE_DESCRIPTION("Atmel ClassD driver under ALSA SoC architecture");
 678 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
 679 MODULE_LICENSE("GPL");