sound/soc/codecs/max98926.c

   1 /*
   2  * max98926.c -- ALSA SoC MAX98926 driver
   3  * Copyright 2013-15 Maxim Integrated Products
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/i2c.h>
  10 #include <linux/module.h>
  11 #include <linux/regmap.h>
  12 #include <linux/slab.h>
  13 #include <linux/cdev.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16 #include <sound/soc.h>
  17 #include <sound/tlv.h>
  18 #include "max98926.h"
  19
  20 static const char * const max98926_boost_voltage_txt[] = {
  21         "8.5V", "8.25V", "8.0V", "7.75V", "7.5V", "7.25V", "7.0V", "6.75V",
  22         "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V"
  23 };
  24
  25 static const char * const max98926_boost_current_txt[] = {
  26         "0.6", "0.8", "1.0", "1.2", "1.4", "1.6", "1.8", "2.0",
  27         "2.2", "2.4", "2.6", "2.8", "3.2", "3.6", "4.0", "4.4"
  28 };
  29
  30 static const char *const max98926_dai_txt[] = {
  31         "Left", "Right", "LeftRight", "LeftRightDiv2",
  32 };
  33
  34 static const char *const max98926_pdm_ch_text[] = {
  35         "Current", "Voltage",
  36 };
  37
  38 static const char *const max98926_hpf_cutoff_txt[] = {
  39         "Disable", "DC Block", "100Hz",
  40         "200Hz", "400Hz", "800Hz",
  41 };
  42
  43 static const struct reg_default max98926_reg[] = {
  44         { 0x0B, 0x00 }, /* IRQ Enable0 */
  45         { 0x0C, 0x00 }, /* IRQ Enable1 */
  46         { 0x0D, 0x00 }, /* IRQ Enable2 */
  47         { 0x0E, 0x00 }, /* IRQ Clear0 */
  48         { 0x0F, 0x00 }, /* IRQ Clear1 */
  49         { 0x10, 0x00 }, /* IRQ Clear2 */
  50         { 0x11, 0xC0 }, /* Map0 */
  51         { 0x12, 0x00 }, /* Map1 */
  52         { 0x13, 0x00 }, /* Map2 */
  53         { 0x14, 0xF0 }, /* Map3 */
  54         { 0x15, 0x00 }, /* Map4 */
  55         { 0x16, 0xAB }, /* Map5 */
  56         { 0x17, 0x89 }, /* Map6 */
  57         { 0x18, 0x00 }, /* Map7 */
  58         { 0x19, 0x00 }, /* Map8 */
  59         { 0x1A, 0x04 }, /* DAI Clock Mode 1 */
  60         { 0x1B, 0x00 }, /* DAI Clock Mode 2 */
  61         { 0x1C, 0x00 }, /* DAI Clock Divider Denominator MSBs */
  62         { 0x1D, 0x00 }, /* DAI Clock Divider Denominator LSBs */
  63         { 0x1E, 0xF0 }, /* DAI Clock Divider Numerator MSBs */
  64         { 0x1F, 0x00 }, /* DAI Clock Divider Numerator LSBs */
  65         { 0x20, 0x50 }, /* Format */
  66         { 0x21, 0x00 }, /* TDM Slot Select */
  67         { 0x22, 0x00 }, /* DOUT Configuration VMON */
  68         { 0x23, 0x00 }, /* DOUT Configuration IMON */
  69         { 0x24, 0x00 }, /* DOUT Configuration VBAT */
  70         { 0x25, 0x00 }, /* DOUT Configuration VBST */
  71         { 0x26, 0x00 }, /* DOUT Configuration FLAG */
  72         { 0x27, 0xFF }, /* DOUT HiZ Configuration 1 */
  73         { 0x28, 0xFF }, /* DOUT HiZ Configuration 2 */
  74         { 0x29, 0xFF }, /* DOUT HiZ Configuration 3 */
  75         { 0x2A, 0xFF }, /* DOUT HiZ Configuration 4 */
  76         { 0x2B, 0x02 }, /* DOUT Drive Strength */
  77         { 0x2C, 0x90 }, /* Filters */
  78         { 0x2D, 0x00 }, /* Gain */
  79         { 0x2E, 0x02 }, /* Gain Ramping */
  80         { 0x2F, 0x00 }, /* Speaker Amplifier */
  81         { 0x30, 0x0A }, /* Threshold */
  82         { 0x31, 0x00 }, /* ALC Attack */
  83         { 0x32, 0x80 }, /* ALC Atten and Release */
  84         { 0x33, 0x00 }, /* ALC Infinite Hold Release */
  85         { 0x34, 0x92 }, /* ALC Configuration */
  86         { 0x35, 0x01 }, /* Boost Converter */
  87         { 0x36, 0x00 }, /* Block Enable */
  88         { 0x37, 0x00 }, /* Configuration */
  89         { 0x38, 0x00 }, /* Global Enable */
  90         { 0x3A, 0x00 }, /* Boost Limiter */
  91 };
  92
  93 static const struct soc_enum max98926_voltage_enum[] = {
  94         SOC_ENUM_SINGLE(MAX98926_DAI_CLK_DIV_N_LSBS, 0,
  95                 ARRAY_SIZE(max98926_pdm_ch_text),
  96                 max98926_pdm_ch_text),
  97 };
  98
  99 static const struct snd_kcontrol_new max98926_voltage_control =
 100         SOC_DAPM_ENUM("Route", max98926_voltage_enum);
 101
 102 static const struct soc_enum max98926_current_enum[] = {
 103         SOC_ENUM_SINGLE(MAX98926_DAI_CLK_DIV_N_LSBS,
 104                 MAX98926_PDM_SOURCE_1_SHIFT,
 105                 ARRAY_SIZE(max98926_pdm_ch_text),
 106                 max98926_pdm_ch_text),
 107 };
 108
 109 static const struct snd_kcontrol_new max98926_current_control =
 110         SOC_DAPM_ENUM("Route", max98926_current_enum);
 111
 112 static const struct snd_kcontrol_new max98926_mixer_controls[] = {
 113         SOC_DAPM_SINGLE("PCM Single Switch", MAX98926_SPK_AMP,
 114                 MAX98926_INSELECT_MODE_SHIFT, 0, 0),
 115         SOC_DAPM_SINGLE("PDM Single Switch", MAX98926_SPK_AMP,
 116                 MAX98926_INSELECT_MODE_SHIFT, 1, 0),
 117 };
 118
 119 static const struct snd_kcontrol_new max98926_dai_controls[] = {
 120         SOC_DAPM_SINGLE("Left", MAX98926_GAIN,
 121                 MAX98926_DAC_IN_SEL_SHIFT, 0, 0),
 122         SOC_DAPM_SINGLE("Right", MAX98926_GAIN,
 123                 MAX98926_DAC_IN_SEL_SHIFT, 1, 0),
 124         SOC_DAPM_SINGLE("LeftRight", MAX98926_GAIN,
 125                 MAX98926_DAC_IN_SEL_SHIFT, 2, 0),
 126         SOC_DAPM_SINGLE("(Left+Right)/2 Switch", MAX98926_GAIN,
 127                 MAX98926_DAC_IN_SEL_SHIFT, 3, 0),
 128 };
 129
 130 static const struct snd_soc_dapm_widget max98926_dapm_widgets[] = {
 131         SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0,
 132                 SND_SOC_NOPM, 0, 0),
 133         SND_SOC_DAPM_DAC("Amp Enable", NULL, MAX98926_BLOCK_ENABLE,
 134                 MAX98926_SPK_EN_SHIFT, 0),
 135         SND_SOC_DAPM_SUPPLY("Global Enable", MAX98926_GLOBAL_ENABLE,
 136                 MAX98926_EN_SHIFT, 0, NULL, 0),
 137         SND_SOC_DAPM_SUPPLY("VI Enable", MAX98926_BLOCK_ENABLE,
 138                 MAX98926_ADC_IMON_EN_WIDTH |
 139                 MAX98926_ADC_VMON_EN_SHIFT,
 140                 0, NULL, 0),
 141         SND_SOC_DAPM_PGA("BST Enable", MAX98926_BLOCK_ENABLE,
 142                 MAX98926_BST_EN_SHIFT, 0, NULL, 0),
 143         SND_SOC_DAPM_OUTPUT("BE_OUT"),
 144         SND_SOC_DAPM_MIXER("PCM Sel", MAX98926_SPK_AMP,
 145                 MAX98926_INSELECT_MODE_SHIFT, 0,
 146                 &max98926_mixer_controls[0],
 147                 ARRAY_SIZE(max98926_mixer_controls)),
 148         SND_SOC_DAPM_MIXER("DAI Sel",
 149                 MAX98926_GAIN, MAX98926_DAC_IN_SEL_SHIFT, 0,
 150                 &max98926_dai_controls[0],
 151                 ARRAY_SIZE(max98926_dai_controls)),
 152         SND_SOC_DAPM_MUX("PDM CH1 Source",
 153                 MAX98926_DAI_CLK_DIV_N_LSBS,
 154                 MAX98926_PDM_CURRENT_SHIFT,
 155                 0, &max98926_current_control),
 156         SND_SOC_DAPM_MUX("PDM CH0 Source",
 157                 MAX98926_DAI_CLK_DIV_N_LSBS,
 158                 MAX98926_PDM_VOLTAGE_SHIFT,
 159                 0, &max98926_voltage_control),
 160 };
 161
 162 static const struct snd_soc_dapm_route max98926_audio_map[] = {
 163         {"VI Enable", NULL, "DAI_OUT"},
 164         {"DAI Sel", "Left", "VI Enable"},
 165         {"DAI Sel", "Right", "VI Enable"},
 166         {"DAI Sel", "LeftRight", "VI Enable"},
 167         {"DAI Sel", "LeftRightDiv2", "VI Enable"},
 168         {"PCM Sel", "PCM", "DAI Sel"},
 169
 170         {"PDM CH1 Source", "Current", "DAI_OUT"},
 171         {"PDM CH1 Source", "Voltage", "DAI_OUT"},
 172         {"PDM CH0 Source", "Current", "DAI_OUT"},
 173         {"PDM CH0 Source", "Voltage", "DAI_OUT"},
 174         {"PCM Sel", "Analog", "PDM CH1 Source"},
 175         {"PCM Sel", "Analog", "PDM CH0 Source"},
 176         {"Amp Enable", NULL, "PCM Sel"},
 177
 178         {"BST Enable", NULL, "Amp Enable"},
 179         {"BE_OUT", NULL, "BST Enable"},
 180 };
 181
 182 static bool max98926_volatile_register(struct device *dev, unsigned int reg)
 183 {
 184         switch (reg) {
 185         case MAX98926_VBAT_DATA:
 186         case MAX98926_VBST_DATA:
 187         case MAX98926_LIVE_STATUS0:
 188         case MAX98926_LIVE_STATUS1:
 189         case MAX98926_LIVE_STATUS2:
 190         case MAX98926_STATE0:
 191         case MAX98926_STATE1:
 192         case MAX98926_STATE2:
 193         case MAX98926_FLAG0:
 194         case MAX98926_FLAG1:
 195         case MAX98926_FLAG2:
 196         case MAX98926_VERSION:
 197                 return true;
 198         default:
 199                 return false;
 200         }
 201 }
 202
 203 static bool max98926_readable_register(struct device *dev, unsigned int reg)
 204 {
 205         switch (reg) {
 206         case MAX98926_IRQ_CLEAR0:
 207         case MAX98926_IRQ_CLEAR1:
 208         case MAX98926_IRQ_CLEAR2:
 209         case MAX98926_ALC_HOLD_RLS:
 210                 return false;
 211         default:
 212                 return true;
 213         }
 214 };
 215
 216 DECLARE_TLV_DB_SCALE(max98926_spk_tlv, -600, 100, 0);
 217 DECLARE_TLV_DB_RANGE(max98926_current_tlv,
 218         0, 11, TLV_DB_SCALE_ITEM(20, 20, 0),
 219         12, 15, TLV_DB_SCALE_ITEM(320, 40, 0),
 220 );
 221
 222 static SOC_ENUM_SINGLE_DECL(max98926_dac_hpf_cutoff,
 223                 MAX98926_FILTERS, MAX98926_DAC_HPF_SHIFT,
 224                 max98926_hpf_cutoff_txt);
 225
 226 static SOC_ENUM_SINGLE_DECL(max98926_boost_voltage,
 227                 MAX98926_CONFIGURATION, MAX98926_BST_VOUT_SHIFT,
 228                 max98926_boost_voltage_txt);
 229
 230 static const struct snd_kcontrol_new max98926_snd_controls[] = {
 231         SOC_SINGLE_TLV("Speaker Volume", MAX98926_GAIN,
 232                 MAX98926_SPK_GAIN_SHIFT,
 233                 (1<<MAX98926_SPK_GAIN_WIDTH)-1, 0,
 234                 max98926_spk_tlv),
 235         SOC_SINGLE("Ramp Switch", MAX98926_GAIN_RAMPING,
 236                 MAX98926_SPK_RMP_EN_SHIFT, 1, 0),
 237         SOC_SINGLE("ZCD Switch", MAX98926_GAIN_RAMPING,
 238                 MAX98926_SPK_ZCD_EN_SHIFT, 1, 0),
 239         SOC_SINGLE("ALC Switch", MAX98926_THRESHOLD,
 240                 MAX98926_ALC_EN_SHIFT, 1, 0),
 241         SOC_SINGLE("ALC Threshold", MAX98926_THRESHOLD,
 242                 MAX98926_ALC_TH_SHIFT,
 243                 (1<<MAX98926_ALC_TH_WIDTH)-1, 0),
 244         SOC_ENUM("Boost Output Voltage", max98926_boost_voltage),
 245         SOC_SINGLE_TLV("Boost Current Limit", MAX98926_BOOST_LIMITER,
 246                 MAX98926_BST_ILIM_SHIFT,
 247                 (1<<MAX98926_BST_ILIM_SHIFT)-1, 0,
 248                 max98926_current_tlv),
 249         SOC_ENUM("DAC HPF Cutoff", max98926_dac_hpf_cutoff),
 250         SOC_DOUBLE("PDM Channel One", MAX98926_DAI_CLK_DIV_N_LSBS,
 251                 MAX98926_PDM_CHANNEL_1_SHIFT,
 252                 MAX98926_PDM_CHANNEL_1_HIZ, 1, 0),
 253         SOC_DOUBLE("PDM Channel Zero", MAX98926_DAI_CLK_DIV_N_LSBS,
 254                 MAX98926_PDM_CHANNEL_0_SHIFT,
 255                 MAX98926_PDM_CHANNEL_0_HIZ, 1, 0),
 256 };
 257
 258 static const struct {
 259         int rate;
 260         int  sr;
 261 } rate_table[] = {
 262         {
 263                 .rate = 8000,
 264                 .sr = 0,
 265         },
 266         {
 267                 .rate = 11025,
 268                 .sr = 1,
 269         },
 270         {
 271                 .rate = 12000,
 272                 .sr = 2,
 273         },
 274         {
 275                 .rate = 16000,
 276                 .sr = 3,
 277         },
 278         {
 279                 .rate = 22050,
 280                 .sr = 4,
 281         },
 282         {
 283                 .rate = 24000,
 284                 .sr = 5,
 285         },
 286         {
 287                 .rate = 32000,
 288                 .sr = 6,
 289         },
 290         {
 291                 .rate = 44100,
 292                 .sr = 7,
 293         },
 294         {
 295                 .rate = 48000,
 296                 .sr = 8,
 297         },
 298 };
 299
 300 static void max98926_set_sense_data(struct max98926_priv *max98926)
 301 {
 302         regmap_update_bits(max98926->regmap,
 303                 MAX98926_DOUT_CFG_VMON,
 304                 MAX98926_DAI_VMON_EN_MASK,
 305                 MAX98926_DAI_VMON_EN_MASK);
 306         regmap_update_bits(max98926->regmap,
 307                 MAX98926_DOUT_CFG_IMON,
 308                 MAX98926_DAI_IMON_EN_MASK,
 309                 MAX98926_DAI_IMON_EN_MASK);
 310
 311         if (!max98926->interleave_mode) {
 312                 /* set VMON slots */
 313                 regmap_update_bits(max98926->regmap,
 314                         MAX98926_DOUT_CFG_VMON,
 315                         MAX98926_DAI_VMON_SLOT_MASK,
 316                         max98926->v_slot);
 317                 /* set IMON slots */
 318                 regmap_update_bits(max98926->regmap,
 319                         MAX98926_DOUT_CFG_IMON,
 320                         MAX98926_DAI_IMON_SLOT_MASK,
 321                         max98926->i_slot);
 322         } else {
 323                 /* enable interleave mode */
 324                 regmap_update_bits(max98926->regmap,
 325                         MAX98926_FORMAT,
 326                         MAX98926_DAI_INTERLEAVE_MASK,
 327                         MAX98926_DAI_INTERLEAVE_MASK);
 328                 /* set interleave slots */
 329                 regmap_update_bits(max98926->regmap,
 330                         MAX98926_DOUT_CFG_VBAT,
 331                         MAX98926_DAI_INTERLEAVE_SLOT_MASK,
 332                         max98926->v_slot);
 333         }
 334 }
 335
 336 static int max98926_dai_set_fmt(struct snd_soc_dai *codec_dai,
 337                 unsigned int fmt)
 338 {
 339         struct snd_soc_codec *codec = codec_dai->codec;
 340         struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
 341         unsigned int invert = 0;
 342
 343         dev_dbg(codec->dev, "%s: fmt 0x%08X\n", __func__, fmt);
 344
 345         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 346         case SND_SOC_DAIFMT_CBS_CFS:
 347                 max98926_set_sense_data(max98926);
 348                 break;
 349         default:
 350                 dev_err(codec->dev, "DAI clock mode unsupported\n");
 351                 return -EINVAL;
 352         }
 353
 354         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 355         case SND_SOC_DAIFMT_NB_NF:
 356                 break;
 357         case SND_SOC_DAIFMT_NB_IF:
 358                 invert = MAX98926_DAI_WCI_MASK;
 359                 break;
 360         case SND_SOC_DAIFMT_IB_NF:
 361                 invert = MAX98926_DAI_BCI_MASK;
 362                 break;
 363         case SND_SOC_DAIFMT_IB_IF:
 364                 invert = MAX98926_DAI_BCI_MASK | MAX98926_DAI_WCI_MASK;
 365                 break;
 366         default:
 367                 dev_err(codec->dev, "DAI invert mode unsupported\n");
 368                 return -EINVAL;
 369         }
 370
 371         regmap_write(max98926->regmap,
 372                         MAX98926_FORMAT, MAX98926_DAI_DLY_MASK);
 373         regmap_update_bits(max98926->regmap, MAX98926_FORMAT,
 374                         MAX98926_DAI_BCI_MASK, invert);
 375         return 0;
 376 }
 377
 378 static int max98926_dai_hw_params(struct snd_pcm_substream *substream,
 379                 struct snd_pcm_hw_params *params,
 380                 struct snd_soc_dai *dai)
 381 {
 382         int dai_sr = -EINVAL;
 383         int rate = params_rate(params), i;
 384         struct snd_soc_codec *codec = dai->codec;
 385         struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
 386         int blr_clk_ratio;
 387
 388         switch (params_format(params)) {
 389         case SNDRV_PCM_FORMAT_S16_LE:
 390                 regmap_update_bits(max98926->regmap,
 391                         MAX98926_FORMAT,
 392                         MAX98926_DAI_CHANSZ_MASK,
 393                         MAX98926_DAI_CHANSZ_16);
 394                 max98926->ch_size = 16;
 395                 break;
 396         case SNDRV_PCM_FORMAT_S24_LE:
 397                 regmap_update_bits(max98926->regmap,
 398                         MAX98926_FORMAT,
 399                         MAX98926_DAI_CHANSZ_MASK,
 400                         MAX98926_DAI_CHANSZ_24);
 401                 max98926->ch_size = 24;
 402                 break;
 403         case SNDRV_PCM_FORMAT_S32_LE:
 404                 regmap_update_bits(max98926->regmap,
 405                         MAX98926_FORMAT,
 406                         MAX98926_DAI_CHANSZ_MASK,
 407                         MAX98926_DAI_CHANSZ_32);
 408                 max98926->ch_size = 32;
 409                 break;
 410         default:
 411                 dev_dbg(codec->dev, "format unsupported %d\n",
 412                         params_format(params));
 413                 return -EINVAL;
 414         }
 415
 416         /* BCLK/LRCLK ratio calculation */
 417         blr_clk_ratio = params_channels(params) * max98926->ch_size;
 418
 419         switch (blr_clk_ratio) {
 420         case 32:
 421                 regmap_update_bits(max98926->regmap,
 422                         MAX98926_DAI_CLK_MODE2,
 423                         MAX98926_DAI_BSEL_MASK,
 424                         MAX98926_DAI_BSEL_32);
 425                 break;
 426         case 48:
 427                 regmap_update_bits(max98926->regmap,
 428                         MAX98926_DAI_CLK_MODE2,
 429                         MAX98926_DAI_BSEL_MASK,
 430                         MAX98926_DAI_BSEL_48);
 431                 break;
 432         case 64:
 433                 regmap_update_bits(max98926->regmap,
 434                         MAX98926_DAI_CLK_MODE2,
 435                         MAX98926_DAI_BSEL_MASK,
 436                         MAX98926_DAI_BSEL_64);
 437                 break;
 438         default:
 439                 return -EINVAL;
 440         }
 441
 442         /* find the closest rate */
 443         for (i = 0; i < ARRAY_SIZE(rate_table); i++) {
 444                 if (rate_table[i].rate >= rate) {
 445                         dai_sr = rate_table[i].sr;
 446                         break;
 447                 }
 448         }
 449         if (dai_sr < 0)
 450                 return -EINVAL;
 451
 452         /* set DAI_SR to correct LRCLK frequency */
 453         regmap_update_bits(max98926->regmap,
 454                 MAX98926_DAI_CLK_MODE2,
 455                 MAX98926_DAI_SR_MASK, dai_sr << MAX98926_DAI_SR_SHIFT);
 456         return 0;
 457 }
 458
 459 #define MAX98926_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
 460                 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 461
 462 static struct snd_soc_dai_ops max98926_dai_ops = {
 463         .set_fmt = max98926_dai_set_fmt,
 464         .hw_params = max98926_dai_hw_params,
 465 };
 466
 467 static struct snd_soc_dai_driver max98926_dai[] = {
 468 {
 469         .name = "max98926-aif1",
 470         .playback = {
 471                 .stream_name = "HiFi Playback",
 472                 .channels_min = 1,
 473                 .channels_max = 2,
 474                 .rates = SNDRV_PCM_RATE_8000_48000,
 475                 .formats = MAX98926_FORMATS,
 476         },
 477         .capture = {
 478                 .stream_name = "HiFi Capture",
 479                 .channels_min = 1,
 480                 .channels_max = 2,
 481                 .rates = SNDRV_PCM_RATE_8000_48000,
 482                 .formats = MAX98926_FORMATS,
 483         },
 484         .ops = &max98926_dai_ops,
 485 }
 486 };
 487
 488 static int max98926_probe(struct snd_soc_codec *codec)
 489 {
 490         struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
 491
 492         max98926->codec = codec;
 493         codec->control_data = max98926->regmap;
 494         /* Hi-Z all the slots */
 495         regmap_write(max98926->regmap, MAX98926_DOUT_HIZ_CFG4, 0xF0);
 496         return 0;
 497 }
 498
 499 static struct snd_soc_codec_driver soc_codec_dev_max98926 = {
 500         .probe  = max98926_probe,
 501         .component_driver = {
 502                 .controls               = max98926_snd_controls,
 503                 .num_controls           = ARRAY_SIZE(max98926_snd_controls),
 504                 .dapm_routes            = max98926_audio_map,
 505                 .num_dapm_routes        = ARRAY_SIZE(max98926_audio_map),
 506                 .dapm_widgets           = max98926_dapm_widgets,
 507                 .num_dapm_widgets       = ARRAY_SIZE(max98926_dapm_widgets),
 508         },
 509 };
 510
 511 static const struct regmap_config max98926_regmap = {
 512         .reg_bits       = 8,
 513         .val_bits       = 8,
 514         .max_register   = MAX98926_VERSION,
 515         .reg_defaults   = max98926_reg,
 516         .num_reg_defaults = ARRAY_SIZE(max98926_reg),
 517         .volatile_reg   = max98926_volatile_register,
 518         .readable_reg   = max98926_readable_register,
 519         .cache_type             = REGCACHE_RBTREE,
 520 };
 521
 522 static int max98926_i2c_probe(struct i2c_client *i2c,
 523                 const struct i2c_device_id *id)
 524 {
 525         int ret, reg;
 526         u32 value;
 527         struct max98926_priv *max98926;
 528
 529         max98926 = devm_kzalloc(&i2c->dev,
 530                         sizeof(*max98926), GFP_KERNEL);
 531         if (!max98926)
 532                 return -ENOMEM;
 533
 534         i2c_set_clientdata(i2c, max98926);
 535         max98926->regmap = devm_regmap_init_i2c(i2c, &max98926_regmap);
 536         if (IS_ERR(max98926->regmap)) {
 537                 ret = PTR_ERR(max98926->regmap);
 538                 dev_err(&i2c->dev,
 539                                 "Failed to allocate regmap: %d\n", ret);
 540                 goto err_out;
 541         }
 542         if (of_property_read_bool(i2c->dev.of_node, "interleave-mode"))
 543                 max98926->interleave_mode = true;
 544
 545         if (!of_property_read_u32(i2c->dev.of_node, "vmon-slot-no", &value)) {
 546                 if (value > MAX98926_DAI_VMON_SLOT_1E_1F) {
 547                         dev_err(&i2c->dev, "vmon slot number is wrong:\n");
 548                         return -EINVAL;
 549                 }
 550                 max98926->v_slot = value;
 551         }
 552         if (!of_property_read_u32(i2c->dev.of_node, "imon-slot-no", &value)) {
 553                 if (value > MAX98926_DAI_IMON_SLOT_1E_1F) {
 554                         dev_err(&i2c->dev, "imon slot number is wrong:\n");
 555                         return -EINVAL;
 556                 }
 557                 max98926->i_slot = value;
 558         }
 559         ret = regmap_read(max98926->regmap,
 560                         MAX98926_VERSION, &reg);
 561         if (ret < 0) {
 562                 dev_err(&i2c->dev, "Failed to read: %x\n", reg);
 563                 return ret;
 564         }
 565
 566         ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_max98926,
 567                         max98926_dai, ARRAY_SIZE(max98926_dai));
 568         if (ret < 0)
 569                 dev_err(&i2c->dev,
 570                                 "Failed to register codec: %d\n", ret);
 571         dev_info(&i2c->dev, "device version: %x\n", reg);
 572 err_out:
 573         return ret;
 574 }
 575
 576 static int max98926_i2c_remove(struct i2c_client *client)
 577 {
 578         snd_soc_unregister_codec(&client->dev);
 579         return 0;
 580 }
 581
 582 static const struct i2c_device_id max98926_i2c_id[] = {
 583         { "max98926", 0 },
 584         { }
 585 };
 586 MODULE_DEVICE_TABLE(i2c, max98926_i2c_id);
 587
 588 static const struct of_device_id max98926_of_match[] = {
 589         { .compatible = "maxim,max98926", },
 590         { }
 591 };
 592 MODULE_DEVICE_TABLE(of, max98926_of_match);
 593
 594 static struct i2c_driver max98926_i2c_driver = {
 595         .driver = {
 596                 .name = "max98926",
 597                 .of_match_table = of_match_ptr(max98926_of_match),
 598                 .pm = NULL,
 599         },
 600         .probe  = max98926_i2c_probe,
 601         .remove = max98926_i2c_remove,
 602         .id_table = max98926_i2c_id,
 603 };
 604
 605 module_i2c_driver(max98926_i2c_driver)
 606 MODULE_DESCRIPTION("ALSA SoC MAX98926 driver");
 607 MODULE_AUTHOR("Anish kumar <anish.kumar@maximintegrated.com>");
 608 MODULE_LICENSE("GPL");