sound/soc/codecs/ak4613.c

   1 /*
   2  * ak4613.c  --  Asahi Kasei ALSA Soc Audio driver
   3  *
   4  * Copyright (C) 2015 Renesas Electronics Corporation
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * Based on ak4642.c by Kuninori Morimoto
   8  * Based on wm8731.c by Richard Purdie
   9  * Based on ak4535.c by Richard Purdie
  10  * Based on wm8753.c by Liam Girdwood
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/i2c.h>
  19 #include <linux/slab.h>
  20 #include <linux/of_device.h>
  21 #include <linux/module.h>
  22 #include <linux/regmap.h>
  23 #include <sound/soc.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/tlv.h>
  26
  27 #define PW_MGMT1        0x00 /* Power Management 1 */
  28 #define PW_MGMT2        0x01 /* Power Management 2 */
  29 #define PW_MGMT3        0x02 /* Power Management 3 */
  30 #define CTRL1           0x03 /* Control 1 */
  31 #define CTRL2           0x04 /* Control 2 */
  32 #define DEMP1           0x05 /* De-emphasis1 */
  33 #define DEMP2           0x06 /* De-emphasis2 */
  34 #define OFD             0x07 /* Overflow Detect */
  35 #define ZRD             0x08 /* Zero Detect */
  36 #define ICTRL           0x09 /* Input Control */
  37 #define OCTRL           0x0a /* Output Control */
  38 #define LOUT1           0x0b /* LOUT1 Volume Control */
  39 #define ROUT1           0x0c /* ROUT1 Volume Control */
  40 #define LOUT2           0x0d /* LOUT2 Volume Control */
  41 #define ROUT2           0x0e /* ROUT2 Volume Control */
  42 #define LOUT3           0x0f /* LOUT3 Volume Control */
  43 #define ROUT3           0x10 /* ROUT3 Volume Control */
  44 #define LOUT4           0x11 /* LOUT4 Volume Control */
  45 #define ROUT4           0x12 /* ROUT4 Volume Control */
  46 #define LOUT5           0x13 /* LOUT5 Volume Control */
  47 #define ROUT5           0x14 /* ROUT5 Volume Control */
  48 #define LOUT6           0x15 /* LOUT6 Volume Control */
  49 #define ROUT6           0x16 /* ROUT6 Volume Control */
  50
  51 /* PW_MGMT1 */
  52 #define RSTN            BIT(0)
  53 #define PMDAC           BIT(1)
  54 #define PMADC           BIT(2)
  55 #define PMVR            BIT(3)
  56
  57 /* PW_MGMT2 */
  58 #define PMAD_ALL        0x7
  59
  60 /* PW_MGMT3 */
  61 #define PMDA_ALL        0x3f
  62
  63 /* CTRL1 */
  64 #define DIF0            BIT(3)
  65 #define DIF1            BIT(4)
  66 #define DIF2            BIT(5)
  67 #define TDM0            BIT(6)
  68 #define TDM1            BIT(7)
  69 #define NO_FMT          (0xff)
  70 #define FMT_MASK        (0xf8)
  71
  72 /* CTRL2 */
  73 #define DFS_MASK                (3 << 2)
  74 #define DFS_NORMAL_SPEED        (0 << 2)
  75 #define DFS_DOUBLE_SPEED        (1 << 2)
  76 #define DFS_QUAD_SPEED          (2 << 2)
  77
  78 /* ICTRL */
  79 #define ICTRL_MASK      (0x3)
  80
  81 /* OCTRL */
  82 #define OCTRL_MASK      (0x3F)
  83
  84 struct ak4613_formats {
  85         unsigned int width;
  86         unsigned int fmt;
  87 };
  88
  89 struct ak4613_interface {
  90         struct ak4613_formats capture;
  91         struct ak4613_formats playback;
  92 };
  93
  94 struct ak4613_priv {
  95         struct mutex lock;
  96         const struct ak4613_interface *iface;
  97         struct snd_pcm_hw_constraint_list constraint;
  98         unsigned int sysclk;
  99
 100         unsigned int fmt;
 101         u8 oc;
 102         u8 ic;
 103         int cnt;
 104 };
 105
 106 /*
 107  * Playback Volume
 108  *
 109  * max : 0x00 : 0 dB
 110  *       ( 0.5 dB step )
 111  * min : 0xFE : -127.0 dB
 112  * mute: 0xFF
 113  */
 114 static const DECLARE_TLV_DB_SCALE(out_tlv, -12750, 50, 1);
 115
 116 static const struct snd_kcontrol_new ak4613_snd_controls[] = {
 117         SOC_DOUBLE_R_TLV("Digital Playback Volume1", LOUT1, ROUT1,
 118                          0, 0xFF, 1, out_tlv),
 119         SOC_DOUBLE_R_TLV("Digital Playback Volume2", LOUT2, ROUT2,
 120                          0, 0xFF, 1, out_tlv),
 121         SOC_DOUBLE_R_TLV("Digital Playback Volume3", LOUT3, ROUT3,
 122                          0, 0xFF, 1, out_tlv),
 123         SOC_DOUBLE_R_TLV("Digital Playback Volume4", LOUT4, ROUT4,
 124                          0, 0xFF, 1, out_tlv),
 125         SOC_DOUBLE_R_TLV("Digital Playback Volume5", LOUT5, ROUT5,
 126                          0, 0xFF, 1, out_tlv),
 127         SOC_DOUBLE_R_TLV("Digital Playback Volume6", LOUT6, ROUT6,
 128                          0, 0xFF, 1, out_tlv),
 129 };
 130
 131 static const struct reg_default ak4613_reg[] = {
 132         { 0x0,  0x0f }, { 0x1,  0x07 }, { 0x2,  0x3f }, { 0x3,  0x20 },
 133         { 0x4,  0x20 }, { 0x5,  0x55 }, { 0x6,  0x05 }, { 0x7,  0x07 },
 134         { 0x8,  0x0f }, { 0x9,  0x07 }, { 0xa,  0x3f }, { 0xb,  0x00 },
 135         { 0xc,  0x00 }, { 0xd,  0x00 }, { 0xe,  0x00 }, { 0xf,  0x00 },
 136         { 0x10, 0x00 }, { 0x11, 0x00 }, { 0x12, 0x00 }, { 0x13, 0x00 },
 137         { 0x14, 0x00 }, { 0x15, 0x00 }, { 0x16, 0x00 },
 138 };
 139
 140 #define AUDIO_IFACE_TO_VAL(fmts) ((fmts - ak4613_iface) << 3)
 141 #define AUDIO_IFACE(b, fmt) { b, SND_SOC_DAIFMT_##fmt }
 142 static const struct ak4613_interface ak4613_iface[] = {
 143         /* capture */                           /* playback */
 144         /* [0] - [2] are not supported */
 145         [3] = { AUDIO_IFACE(24, LEFT_J),        AUDIO_IFACE(24, LEFT_J) },
 146         [4] = { AUDIO_IFACE(24, I2S),           AUDIO_IFACE(24, I2S) },
 147 };
 148
 149 static const struct regmap_config ak4613_regmap_cfg = {
 150         .reg_bits               = 8,
 151         .val_bits               = 8,
 152         .max_register           = 0x16,
 153         .reg_defaults           = ak4613_reg,
 154         .num_reg_defaults       = ARRAY_SIZE(ak4613_reg),
 155         .cache_type             = REGCACHE_RBTREE,
 156 };
 157
 158 static const struct of_device_id ak4613_of_match[] = {
 159         { .compatible = "asahi-kasei,ak4613",   .data = &ak4613_regmap_cfg },
 160         {},
 161 };
 162 MODULE_DEVICE_TABLE(of, ak4613_of_match);
 163
 164 static const struct i2c_device_id ak4613_i2c_id[] = {
 165         { "ak4613", (kernel_ulong_t)&ak4613_regmap_cfg },
 166         { }
 167 };
 168 MODULE_DEVICE_TABLE(i2c, ak4613_i2c_id);
 169
 170 static const struct snd_soc_dapm_widget ak4613_dapm_widgets[] = {
 171
 172         /* Outputs */
 173         SND_SOC_DAPM_OUTPUT("LOUT1"),
 174         SND_SOC_DAPM_OUTPUT("LOUT2"),
 175         SND_SOC_DAPM_OUTPUT("LOUT3"),
 176         SND_SOC_DAPM_OUTPUT("LOUT4"),
 177         SND_SOC_DAPM_OUTPUT("LOUT5"),
 178         SND_SOC_DAPM_OUTPUT("LOUT6"),
 179
 180         SND_SOC_DAPM_OUTPUT("ROUT1"),
 181         SND_SOC_DAPM_OUTPUT("ROUT2"),
 182         SND_SOC_DAPM_OUTPUT("ROUT3"),
 183         SND_SOC_DAPM_OUTPUT("ROUT4"),
 184         SND_SOC_DAPM_OUTPUT("ROUT5"),
 185         SND_SOC_DAPM_OUTPUT("ROUT6"),
 186
 187         /* Inputs */
 188         SND_SOC_DAPM_INPUT("LIN1"),
 189         SND_SOC_DAPM_INPUT("LIN2"),
 190
 191         SND_SOC_DAPM_INPUT("RIN1"),
 192         SND_SOC_DAPM_INPUT("RIN2"),
 193
 194         /* DAC */
 195         SND_SOC_DAPM_DAC("DAC1", NULL, PW_MGMT3, 0, 0),
 196         SND_SOC_DAPM_DAC("DAC2", NULL, PW_MGMT3, 1, 0),
 197         SND_SOC_DAPM_DAC("DAC3", NULL, PW_MGMT3, 2, 0),
 198         SND_SOC_DAPM_DAC("DAC4", NULL, PW_MGMT3, 3, 0),
 199         SND_SOC_DAPM_DAC("DAC5", NULL, PW_MGMT3, 4, 0),
 200         SND_SOC_DAPM_DAC("DAC6", NULL, PW_MGMT3, 5, 0),
 201
 202         /* ADC */
 203         SND_SOC_DAPM_ADC("ADC1", NULL, PW_MGMT2, 0, 0),
 204         SND_SOC_DAPM_ADC("ADC2", NULL, PW_MGMT2, 1, 0),
 205 };
 206
 207 static const struct snd_soc_dapm_route ak4613_intercon[] = {
 208         {"LOUT1", NULL, "DAC1"},
 209         {"LOUT2", NULL, "DAC2"},
 210         {"LOUT3", NULL, "DAC3"},
 211         {"LOUT4", NULL, "DAC4"},
 212         {"LOUT5", NULL, "DAC5"},
 213         {"LOUT6", NULL, "DAC6"},
 214
 215         {"ROUT1", NULL, "DAC1"},
 216         {"ROUT2", NULL, "DAC2"},
 217         {"ROUT3", NULL, "DAC3"},
 218         {"ROUT4", NULL, "DAC4"},
 219         {"ROUT5", NULL, "DAC5"},
 220         {"ROUT6", NULL, "DAC6"},
 221
 222         {"DAC1", NULL, "Playback"},
 223         {"DAC2", NULL, "Playback"},
 224         {"DAC3", NULL, "Playback"},
 225         {"DAC4", NULL, "Playback"},
 226         {"DAC5", NULL, "Playback"},
 227         {"DAC6", NULL, "Playback"},
 228
 229         {"Capture", NULL, "ADC1"},
 230         {"Capture", NULL, "ADC2"},
 231
 232         {"ADC1", NULL, "LIN1"},
 233         {"ADC2", NULL, "LIN2"},
 234
 235         {"ADC1", NULL, "RIN1"},
 236         {"ADC2", NULL, "RIN2"},
 237 };
 238
 239 static void ak4613_dai_shutdown(struct snd_pcm_substream *substream,
 240                                struct snd_soc_dai *dai)
 241 {
 242         struct snd_soc_codec *codec = dai->codec;
 243         struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
 244         struct device *dev = codec->dev;
 245
 246         mutex_lock(&priv->lock);
 247         priv->cnt--;
 248         if (priv->cnt < 0) {
 249                 dev_err(dev, "unexpected counter error\n");
 250                 priv->cnt = 0;
 251         }
 252         if (!priv->cnt)
 253                 priv->iface = NULL;
 254         mutex_unlock(&priv->lock);
 255 }
 256
 257 static void ak4613_hw_constraints(struct ak4613_priv *priv,
 258                                   struct snd_pcm_runtime *runtime)
 259 {
 260         static const unsigned int ak4613_rates[] = {
 261                  32000,
 262                  44100,
 263                  48000,
 264                  64000,
 265                  88200,
 266                  96000,
 267                 176400,
 268                 192000,
 269         };
 270         struct snd_pcm_hw_constraint_list *constraint = &priv->constraint;
 271         unsigned int fs;
 272         int i;
 273
 274         constraint->list        = ak4613_rates;
 275         constraint->mask        = 0;
 276         constraint->count       = 0;
 277
 278         /*
 279          * Slave Mode
 280          *      Normal: [32kHz, 48kHz] : 256fs,384fs or 512fs
 281          *      Double: [64kHz, 96kHz] : 256fs
 282          *      Quad  : [128kHz,192kHz]: 128fs
 283          *
 284          * Master mode
 285          *      Normal: [32kHz, 48kHz] : 256fs or 512fs
 286          *      Double: [64kHz, 96kHz] : 256fs
 287          *      Quad  : [128kHz,192kHz]: 128fs
 288         */
 289         for (i = 0; i < ARRAY_SIZE(ak4613_rates); i++) {
 290                 /* minimum fs on each range */
 291                 fs = (ak4613_rates[i] <= 96000) ? 256 : 128;
 292
 293                 if (priv->sysclk >= ak4613_rates[i] * fs)
 294                         constraint->count = i + 1;
 295         }
 296
 297         snd_pcm_hw_constraint_list(runtime, 0,
 298                                 SNDRV_PCM_HW_PARAM_RATE, constraint);
 299 }
 300
 301 static int ak4613_dai_startup(struct snd_pcm_substream *substream,
 302                               struct snd_soc_dai *dai)
 303 {
 304         struct snd_soc_codec *codec = dai->codec;
 305         struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
 306
 307         priv->cnt++;
 308
 309         ak4613_hw_constraints(priv, substream->runtime);
 310
 311         return 0;
 312 }
 313
 314 static int ak4613_dai_set_sysclk(struct snd_soc_dai *codec_dai,
 315                                  int clk_id, unsigned int freq, int dir)
 316 {
 317         struct snd_soc_codec *codec = codec_dai->codec;
 318         struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
 319
 320         priv->sysclk = freq;
 321
 322         return 0;
 323 }
 324
 325 static int ak4613_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 326 {
 327         struct snd_soc_codec *codec = dai->codec;
 328         struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
 329
 330         fmt &= SND_SOC_DAIFMT_FORMAT_MASK;
 331
 332         switch (fmt) {
 333         case SND_SOC_DAIFMT_LEFT_J:
 334         case SND_SOC_DAIFMT_I2S:
 335                 priv->fmt = fmt;
 336                 break;
 337         default:
 338                 return -EINVAL;
 339         }
 340
 341         return 0;
 342 }
 343
 344 static bool ak4613_dai_fmt_matching(const struct ak4613_interface *iface,
 345                                     int is_play,
 346                                     unsigned int fmt, unsigned int width)
 347 {
 348         const struct ak4613_formats *fmts;
 349
 350         fmts = (is_play) ? &iface->playback : &iface->capture;
 351
 352         if (fmts->fmt != fmt)
 353                 return false;
 354
 355         if (fmts->width != width)
 356                 return false;
 357
 358         return true;
 359 }
 360
 361 static int ak4613_dai_hw_params(struct snd_pcm_substream *substream,
 362                                 struct snd_pcm_hw_params *params,
 363                                 struct snd_soc_dai *dai)
 364 {
 365         struct snd_soc_codec *codec = dai->codec;
 366         struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
 367         const struct ak4613_interface *iface;
 368         struct device *dev = codec->dev;
 369         unsigned int width = params_width(params);
 370         unsigned int fmt = priv->fmt;
 371         unsigned int rate;
 372         int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 373         int i, ret;
 374         u8 fmt_ctrl, ctrl2;
 375
 376         rate = params_rate(params);
 377         switch (rate) {
 378         case 32000:
 379         case 44100:
 380         case 48000:
 381                 ctrl2 = DFS_NORMAL_SPEED;
 382                 break;
 383         case 64000:
 384         case 88200:
 385         case 96000:
 386                 ctrl2 = DFS_DOUBLE_SPEED;
 387                 break;
 388         case 176400:
 389         case 192000:
 390                 ctrl2 = DFS_QUAD_SPEED;
 391                 break;
 392         default:
 393                 return -EINVAL;
 394         }
 395
 396         /*
 397          * FIXME
 398          *
 399          * It doesn't support TDM at this point
 400          */
 401         fmt_ctrl = NO_FMT;
 402         ret = -EINVAL;
 403         iface = NULL;
 404
 405         mutex_lock(&priv->lock);
 406         if (priv->iface) {
 407                 if (ak4613_dai_fmt_matching(priv->iface, is_play, fmt, width))
 408                         iface = priv->iface;
 409         } else {
 410                 for (i = ARRAY_SIZE(ak4613_iface) - 1; i >= 0; i--) {
 411                         if (!ak4613_dai_fmt_matching(ak4613_iface + i,
 412                                                      is_play,
 413                                                      fmt, width))
 414                                 continue;
 415                         iface = ak4613_iface + i;
 416                         break;
 417                 }
 418         }
 419
 420         if ((priv->iface == NULL) ||
 421             (priv->iface == iface)) {
 422                 priv->iface = iface;
 423                 ret = 0;
 424         }
 425         mutex_unlock(&priv->lock);
 426
 427         if (ret < 0)
 428                 goto hw_params_end;
 429
 430         fmt_ctrl = AUDIO_IFACE_TO_VAL(iface);
 431
 432         snd_soc_update_bits(codec, CTRL1, FMT_MASK, fmt_ctrl);
 433         snd_soc_update_bits(codec, CTRL2, DFS_MASK, ctrl2);
 434
 435         snd_soc_update_bits(codec, ICTRL, ICTRL_MASK, priv->ic);
 436         snd_soc_update_bits(codec, OCTRL, OCTRL_MASK, priv->oc);
 437
 438 hw_params_end:
 439         if (ret < 0)
 440                 dev_warn(dev, "unsupported data width/format combination\n");
 441
 442         return ret;
 443 }
 444
 445 static int ak4613_set_bias_level(struct snd_soc_codec *codec,
 446                                  enum snd_soc_bias_level level)
 447 {
 448         u8 mgmt1 = 0;
 449
 450         switch (level) {
 451         case SND_SOC_BIAS_ON:
 452                 mgmt1 |= RSTN;
 453                 /* fall through */
 454         case SND_SOC_BIAS_PREPARE:
 455                 mgmt1 |= PMADC | PMDAC;
 456                 /* fall through */
 457         case SND_SOC_BIAS_STANDBY:
 458                 mgmt1 |= PMVR;
 459                 /* fall through */
 460         case SND_SOC_BIAS_OFF:
 461         default:
 462                 break;
 463         }
 464
 465         snd_soc_write(codec, PW_MGMT1, mgmt1);
 466
 467         return 0;
 468 }
 469
 470 static const struct snd_soc_dai_ops ak4613_dai_ops = {
 471         .startup        = ak4613_dai_startup,
 472         .shutdown       = ak4613_dai_shutdown,
 473         .set_sysclk     = ak4613_dai_set_sysclk,
 474         .set_fmt        = ak4613_dai_set_fmt,
 475         .hw_params      = ak4613_dai_hw_params,
 476 };
 477
 478 #define AK4613_PCM_RATE         (SNDRV_PCM_RATE_32000  |\
 479                                  SNDRV_PCM_RATE_44100  |\
 480                                  SNDRV_PCM_RATE_48000  |\
 481                                  SNDRV_PCM_RATE_64000  |\
 482                                  SNDRV_PCM_RATE_88200  |\
 483                                  SNDRV_PCM_RATE_96000  |\
 484                                  SNDRV_PCM_RATE_176400 |\
 485                                  SNDRV_PCM_RATE_192000)
 486 #define AK4613_PCM_FMTBIT       (SNDRV_PCM_FMTBIT_S24_LE)
 487
 488 static struct snd_soc_dai_driver ak4613_dai = {
 489         .name = "ak4613-hifi",
 490         .playback = {
 491                 .stream_name    = "Playback",
 492                 .channels_min   = 2,
 493                 .channels_max   = 2,
 494                 .rates          = AK4613_PCM_RATE,
 495                 .formats        = AK4613_PCM_FMTBIT,
 496         },
 497         .capture = {
 498                 .stream_name    = "Capture",
 499                 .channels_min   = 2,
 500                 .channels_max   = 2,
 501                 .rates          = AK4613_PCM_RATE,
 502                 .formats        = AK4613_PCM_FMTBIT,
 503         },
 504         .ops = &ak4613_dai_ops,
 505         .symmetric_rates = 1,
 506 };
 507
 508 static int ak4613_suspend(struct snd_soc_codec *codec)
 509 {
 510         struct regmap *regmap = dev_get_regmap(codec->dev, NULL);
 511
 512         regcache_cache_only(regmap, true);
 513         regcache_mark_dirty(regmap);
 514         return 0;
 515 }
 516
 517 static int ak4613_resume(struct snd_soc_codec *codec)
 518 {
 519         struct regmap *regmap = dev_get_regmap(codec->dev, NULL);
 520
 521         regcache_cache_only(regmap, false);
 522         return regcache_sync(regmap);
 523 }
 524
 525 static const struct snd_soc_codec_driver soc_codec_dev_ak4613 = {
 526         .suspend                = ak4613_suspend,
 527         .resume                 = ak4613_resume,
 528         .set_bias_level         = ak4613_set_bias_level,
 529         .component_driver = {
 530                 .controls               = ak4613_snd_controls,
 531                 .num_controls           = ARRAY_SIZE(ak4613_snd_controls),
 532                 .dapm_widgets           = ak4613_dapm_widgets,
 533                 .num_dapm_widgets       = ARRAY_SIZE(ak4613_dapm_widgets),
 534                 .dapm_routes            = ak4613_intercon,
 535                 .num_dapm_routes        = ARRAY_SIZE(ak4613_intercon),
 536         },
 537 };
 538
 539 static void ak4613_parse_of(struct ak4613_priv *priv,
 540                             struct device *dev)
 541 {
 542         struct device_node *np = dev->of_node;
 543         char prop[32];
 544         int i;
 545
 546         /* Input 1 - 2 */
 547         for (i = 0; i < 2; i++) {
 548                 snprintf(prop, sizeof(prop), "asahi-kasei,in%d-single-end", i + 1);
 549                 if (!of_get_property(np, prop, NULL))
 550                         priv->ic |= 1 << i;
 551         }
 552
 553         /* Output 1 - 6 */
 554         for (i = 0; i < 6; i++) {
 555                 snprintf(prop, sizeof(prop), "asahi-kasei,out%d-single-end", i + 1);
 556                 if (!of_get_property(np, prop, NULL))
 557                         priv->oc |= 1 << i;
 558         }
 559 }
 560
 561 static int ak4613_i2c_probe(struct i2c_client *i2c,
 562                             const struct i2c_device_id *id)
 563 {
 564         struct device *dev = &i2c->dev;
 565         struct device_node *np = dev->of_node;
 566         const struct regmap_config *regmap_cfg;
 567         struct regmap *regmap;
 568         struct ak4613_priv *priv;
 569
 570         regmap_cfg = NULL;
 571         if (np) {
 572                 const struct of_device_id *of_id;
 573
 574                 of_id = of_match_device(ak4613_of_match, dev);
 575                 if (of_id)
 576                         regmap_cfg = of_id->data;
 577         } else {
 578                 regmap_cfg = (const struct regmap_config *)id->driver_data;
 579         }
 580
 581         if (!regmap_cfg)
 582                 return -EINVAL;
 583
 584         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 585         if (!priv)
 586                 return -ENOMEM;
 587
 588         ak4613_parse_of(priv, dev);
 589
 590         priv->iface             = NULL;
 591         priv->cnt               = 0;
 592         priv->sysclk            = 0;
 593
 594         mutex_init(&priv->lock);
 595
 596         i2c_set_clientdata(i2c, priv);
 597
 598         regmap = devm_regmap_init_i2c(i2c, regmap_cfg);
 599         if (IS_ERR(regmap))
 600                 return PTR_ERR(regmap);
 601
 602         return snd_soc_register_codec(dev, &soc_codec_dev_ak4613,
 603                                       &ak4613_dai, 1);
 604 }
 605
 606 static int ak4613_i2c_remove(struct i2c_client *client)
 607 {
 608         snd_soc_unregister_codec(&client->dev);
 609         return 0;
 610 }
 611
 612 static struct i2c_driver ak4613_i2c_driver = {
 613         .driver = {
 614                 .name = "ak4613-codec",
 615                 .of_match_table = ak4613_of_match,
 616         },
 617         .probe          = ak4613_i2c_probe,
 618         .remove         = ak4613_i2c_remove,
 619         .id_table       = ak4613_i2c_id,
 620 };
 621
 622 module_i2c_driver(ak4613_i2c_driver);
 623
 624 MODULE_DESCRIPTION("Soc AK4613 driver");
 625 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 626 MODULE_LICENSE("GPL v2");