sound/soc/codecs/max9867.c

   1 /*
   2  * max9867.c -- max9867 ALSA SoC Audio driver
   3  *
   4  * Copyright 2013-15 Maxim Integrated Products
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/i2c.h>
  13 #include <linux/module.h>
  14 #include <linux/regmap.h>
  15 #include <sound/pcm_params.h>
  16 #include <sound/soc.h>
  17 #include <sound/tlv.h>
  18 #include "max9867.h"
  19
  20 static const char *const max9867_spmode[] = {
  21         "Stereo Diff", "Mono Diff",
  22         "Stereo Cap", "Mono Cap",
  23         "Stereo Single", "Mono Single",
  24         "Stereo Single Fast", "Mono Single Fast"
  25 };
  26 static const char *const max9867_sidetone_text[] = {
  27         "None", "Left", "Right", "LeftRight", "LeftRightDiv2",
  28 };
  29 static const char *const max9867_filter_text[] = {"IIR", "FIR"};
  30
  31 static SOC_ENUM_SINGLE_DECL(max9867_filter, MAX9867_CODECFLTR, 7,
  32         max9867_filter_text);
  33 static SOC_ENUM_SINGLE_DECL(max9867_spkmode, MAX9867_MODECONFIG, 0,
  34         max9867_spmode);
  35 static SOC_ENUM_SINGLE_DECL(max9867_sidetone, MAX9867_DACGAIN, 6,
  36         max9867_sidetone_text);
  37 static DECLARE_TLV_DB_SCALE(max9860_capture_tlv, -600, 200, 0);
  38 static DECLARE_TLV_DB_SCALE(max9860_mic_tlv, 2000, 100, 1);
  39 static DECLARE_TLV_DB_SCALE(max9860_adc_left_tlv, -1200, 100, 1);
  40 static DECLARE_TLV_DB_SCALE(max9860_adc_right_tlv, -1200, 100, 1);
  41 static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(max98088_micboost_tlv,
  42         0, 1, TLV_DB_SCALE_ITEM(0, 2000, 0),
  43         2, 2, TLV_DB_SCALE_ITEM(3000, 0, 0),
  44 );
  45
  46 static const struct snd_kcontrol_new max9867_snd_controls[] = {
  47         SOC_DOUBLE_R("Master Playback Volume", MAX9867_LEFTVOL,
  48                                 MAX9867_RIGHTVOL, 0, 63, 1),
  49         SOC_DOUBLE_R_TLV("Capture Volume", MAX9867_LEFTMICGAIN,
  50                         MAX9867_RIGHTMICGAIN,
  51                         0, 15, 1, max9860_capture_tlv),
  52         SOC_DOUBLE_R_TLV("Mic Volume", MAX9867_LEFTMICGAIN,
  53                         MAX9867_RIGHTMICGAIN, 0, 31, 1, max9860_mic_tlv),
  54         SOC_DOUBLE_R_TLV("Mic Boost Volume", MAX9867_LEFTMICGAIN,
  55                         MAX9867_RIGHTMICGAIN, 5, 3, 0, max98088_micboost_tlv),
  56         SOC_ENUM("Digital Sidetone Src", max9867_sidetone),
  57         SOC_SINGLE("Sidetone Volume", MAX9867_DACGAIN, 0, 31, 1),
  58         SOC_SINGLE("DAC Volume", MAX9867_DACLEVEL, 4, 3, 0),
  59         SOC_SINGLE("DAC Attenuation", MAX9867_DACLEVEL, 0, 15, 1),
  60         SOC_SINGLE_TLV("ADC Left Volume", MAX9867_ADCLEVEL,
  61                         4, 15, 1, max9860_adc_left_tlv),
  62         SOC_SINGLE_TLV("ADC Right Volume", MAX9867_ADCLEVEL,
  63                         0, 15, 1, max9860_adc_right_tlv),
  64         SOC_ENUM("Speaker Mode", max9867_spkmode),
  65         SOC_SINGLE("Volume Smoothing Switch", MAX9867_MODECONFIG, 6, 1, 0),
  66         SOC_SINGLE("ZCD Switch", MAX9867_MODECONFIG, 5, 1, 0),
  67         SOC_ENUM("DSP Filter", max9867_filter),
  68 };
  69
  70 static const char *const max9867_mux[] = {"None", "Mic", "Line", "Mic_Line"};
  71
  72 static SOC_ENUM_SINGLE_DECL(max9867_mux_enum,
  73         MAX9867_INPUTCONFIG, MAX9867_INPUT_SHIFT,
  74         max9867_mux);
  75
  76 static const struct snd_kcontrol_new max9867_dapm_mux_controls =
  77         SOC_DAPM_ENUM("Route", max9867_mux_enum);
  78
  79 static const struct snd_kcontrol_new max9867_left_dapm_control =
  80         SOC_DAPM_SINGLE("Switch", MAX9867_PWRMAN, 6, 1, 0);
  81 static const struct snd_kcontrol_new max9867_right_dapm_control =
  82         SOC_DAPM_SINGLE("Switch", MAX9867_PWRMAN, 5, 1, 0);
  83 static const struct snd_kcontrol_new max9867_line_dapm_control =
  84         SOC_DAPM_SINGLE("Switch", MAX9867_LEFTLINELVL, 6, 1, 1);
  85
  86 static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
  87         SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0),
  88         SND_SOC_DAPM_DAC("Left DAC", NULL, MAX9867_PWRMAN, 3, 0),
  89         SND_SOC_DAPM_DAC("Right DAC", NULL, MAX9867_PWRMAN, 2, 0),
  90         SND_SOC_DAPM_MIXER("Output Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
  91         SND_SOC_DAPM_OUTPUT("HPOUT"),
  92
  93         SND_SOC_DAPM_AIF_IN("DAI_IN", "HiFi Capture", 0, SND_SOC_NOPM, 0, 0),
  94         SND_SOC_DAPM_ADC("Left ADC", "HiFi Capture", MAX9867_PWRMAN, 1, 0),
  95         SND_SOC_DAPM_ADC("Right ADC", "HiFi Capture", MAX9867_PWRMAN, 0, 0),
  96         SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
  97                 &max9867_dapm_mux_controls),
  98
  99         SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
 100         SND_SOC_DAPM_SWITCH("Left Line", MAX9867_LEFTLINELVL, 6, 1,
 101                 &max9867_left_dapm_control),
 102         SND_SOC_DAPM_SWITCH("Right Line", MAX9867_RIGTHLINELVL, 6, 1,
 103                 &max9867_right_dapm_control),
 104         SND_SOC_DAPM_SWITCH("Line Mixer", SND_SOC_NOPM, 0, 0,
 105                 &max9867_line_dapm_control),
 106         SND_SOC_DAPM_INPUT("LINE_IN"),
 107 };
 108
 109 static const struct snd_soc_dapm_route max9867_audio_map[] = {
 110         {"Left DAC", NULL, "DAI_OUT"},
 111         {"Right DAC", NULL, "DAI_OUT"},
 112         {"Output Mixer", NULL, "Left DAC"},
 113         {"Output Mixer", NULL, "Right DAC"},
 114         {"HPOUT", NULL, "Output Mixer"},
 115
 116         {"Left ADC", NULL, "DAI_IN"},
 117         {"Right ADC", NULL, "DAI_IN"},
 118         {"Input Mixer", NULL, "Left ADC"},
 119         {"Input Mixer", NULL, "Right ADC"},
 120         {"Input Mux", "Line", "Input Mixer"},
 121         {"Input Mux", "Mic", "Input Mixer"},
 122         {"Input Mux", "Mic_Line", "Input Mixer"},
 123         {"Right Line", "Switch", "Input Mux"},
 124         {"Left Line", "Switch", "Input Mux"},
 125         {"LINE_IN", NULL, "Left Line"},
 126         {"LINE_IN", NULL, "Right Line"},
 127 };
 128
 129 enum rates {
 130         pcm_rate_8, pcm_rate_16, pcm_rate_24,
 131         pcm_rate_32, pcm_rate_44,
 132         pcm_rate_48, max_pcm_rate,
 133 };
 134
 135 static const struct ni_div_rates {
 136         u32 mclk;
 137         u16 ni[max_pcm_rate];
 138 } ni_div[] = {
 139         {11289600, {0x116A, 0x22D4, 0x343F, 0x45A9, 0x6000, 0x687D} },
 140         {12000000, {0x1062, 0x20C5, 0x3127, 0x4189, 0x5A51, 0x624E} },
 141         {12288000, {0x1000, 0x2000, 0x3000, 0x4000, 0x5833, 0x6000} },
 142         {13000000, {0x0F20, 0x1E3F, 0x2D5F, 0x3C7F, 0x535F, 0x5ABE} },
 143         {19200000, {0x0A3D, 0x147B, 0x1EB8, 0x28F6, 0x3873, 0x3D71} },
 144         {24000000, {0x1062, 0x20C5, 0x1893, 0x4189, 0x5A51, 0x624E} },
 145         {26000000, {0x0F20, 0x1E3F, 0x16AF, 0x3C7F, 0x535F, 0x5ABE} },
 146         {27000000, {0x0E90, 0x1D21, 0x15D8, 0x3A41, 0x5048, 0x5762} },
 147 };
 148
 149 static inline int get_ni_value(int mclk, int rate)
 150 {
 151         int i, ret = 0;
 152
 153         /* find the closest rate index*/
 154         for (i = 0; i < ARRAY_SIZE(ni_div); i++) {
 155                 if (ni_div[i].mclk >= mclk)
 156                         break;
 157         }
 158         if (i == ARRAY_SIZE(ni_div))
 159                 return -EINVAL;
 160
 161         switch (rate) {
 162         case 8000:
 163                 return ni_div[i].ni[pcm_rate_8];
 164         case 16000:
 165                 return ni_div[i].ni[pcm_rate_16];
 166         case 32000:
 167                 return ni_div[i].ni[pcm_rate_32];
 168         case 44100:
 169                 return ni_div[i].ni[pcm_rate_44];
 170         case 48000:
 171                 return ni_div[i].ni[pcm_rate_48];
 172         default:
 173                 pr_err("%s wrong rate %d\n", __func__, rate);
 174                 ret = -EINVAL;
 175         }
 176         return ret;
 177 }
 178
 179 static int max9867_dai_hw_params(struct snd_pcm_substream *substream,
 180                 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 181 {
 182         struct snd_soc_component *component = dai->component;
 183         struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
 184         unsigned int ni_h, ni_l;
 185         int value;
 186
 187         value = get_ni_value(max9867->sysclk, params_rate(params));
 188         if (value < 0)
 189                 return value;
 190
 191         ni_h = (0xFF00 & value) >> 8;
 192         ni_l = 0x00FF & value;
 193         /* set up the ni value */
 194         regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
 195                 MAX9867_NI_HIGH_MASK, ni_h);
 196         regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
 197                 MAX9867_NI_LOW_MASK, ni_l);
 198         if (!max9867->master) {
 199                 /*
 200                  * digital pll locks on to any externally supplied LRCLK signal
 201                  * and also enable rapid lock mode.
 202                  */
 203                 regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
 204                         MAX9867_RAPID_LOCK, MAX9867_RAPID_LOCK);
 205                 regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
 206                         MAX9867_PLL, MAX9867_PLL);
 207         } else {
 208                 unsigned long int bclk_rate, pclk_bclk_ratio;
 209                 int bclk_value;
 210
 211                 bclk_rate = params_rate(params) * 2 * params_width(params);
 212                 pclk_bclk_ratio = max9867->pclk/bclk_rate;
 213                 switch (params_width(params)) {
 214                 case 8:
 215                 case 16:
 216                         switch (pclk_bclk_ratio) {
 217                         case 2:
 218                                 bclk_value = MAX9867_IFC1B_PCLK_2;
 219                                 break;
 220                         case 4:
 221                                 bclk_value = MAX9867_IFC1B_PCLK_4;
 222                                 break;
 223                         case 8:
 224                                 bclk_value = MAX9867_IFC1B_PCLK_8;
 225                                 break;
 226                         case 16:
 227                                 bclk_value = MAX9867_IFC1B_PCLK_16;
 228                                 break;
 229                         default:
 230                                 dev_err(component->dev,
 231                                         "unsupported sampling rate\n");
 232                                 return -EINVAL;
 233                         }
 234                         break;
 235                 case 24:
 236                         bclk_value = MAX9867_IFC1B_24BIT;
 237                         break;
 238                 case 32:
 239                         bclk_value = MAX9867_IFC1B_32BIT;
 240                         break;
 241                 default:
 242                         dev_err(component->dev, "unsupported sampling rate\n");
 243                         return -EINVAL;
 244                 }
 245                 regmap_update_bits(max9867->regmap, MAX9867_IFC1B,
 246                         MAX9867_IFC1B_BCLK_MASK, bclk_value);
 247         }
 248         return 0;
 249 }
 250
 251 static int max9867_prepare(struct snd_pcm_substream *substream,
 252                          struct snd_soc_dai *dai)
 253 {
 254         struct snd_soc_component *component = dai->component;
 255         struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
 256
 257         regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
 258                 MAX9867_SHTDOWN_MASK, MAX9867_SHTDOWN_MASK);
 259         return 0;
 260 }
 261
 262 static int max9867_mute(struct snd_soc_dai *dai, int mute)
 263 {
 264         struct snd_soc_component *component = dai->component;
 265         struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
 266
 267         if (mute)
 268                 regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
 269                         MAX9867_DAC_MUTE_MASK, MAX9867_DAC_MUTE_MASK);
 270         else
 271                 regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
 272                         MAX9867_DAC_MUTE_MASK, 0);
 273         return 0;
 274 }
 275
 276 static int max9867_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 277                 int clk_id, unsigned int freq, int dir)
 278 {
 279         struct snd_soc_component *component = codec_dai->component;
 280         struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
 281         int value = 0;
 282
 283         /* Set the prescaler based on the master clock frequency*/
 284         if (freq >= 10000000 && freq <= 20000000) {
 285                 value |= MAX9867_PSCLK_10_20;
 286                 max9867->pclk =  freq;
 287         } else if (freq >= 20000000 && freq <= 40000000) {
 288                 value |= MAX9867_PSCLK_20_40;
 289                 max9867->pclk =  freq/2;
 290         } else if (freq >= 40000000 && freq <= 60000000) {
 291                 value |= MAX9867_PSCLK_40_60;
 292                 max9867->pclk =  freq/4;
 293         } else {
 294                 dev_err(component->dev,
 295                         "Invalid clock frequency %uHz (required 10-60MHz)\n",
 296                         freq);
 297                 return -EINVAL;
 298         }
 299         value = value << MAX9867_PSCLK_SHIFT;
 300         max9867->sysclk = freq;
 301         /* exact integer mode is not supported */
 302         value &= ~MAX9867_FREQ_MASK;
 303         regmap_update_bits(max9867->regmap, MAX9867_SYSCLK,
 304                         MAX9867_PSCLK_MASK, value);
 305         return 0;
 306 }
 307
 308 static int max9867_dai_set_fmt(struct snd_soc_dai *codec_dai,
 309                 unsigned int fmt)
 310 {
 311         struct snd_soc_component *component = codec_dai->component;
 312         struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
 313         u8 iface1A = 0, iface1B = 0;
 314
 315         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 316         case SND_SOC_DAIFMT_CBM_CFM:
 317                 max9867->master = 1;
 318                 iface1A |= MAX9867_MASTER;
 319                 break;
 320         case SND_SOC_DAIFMT_CBS_CFS:
 321                 max9867->master = 0;
 322                 iface1A &= ~MAX9867_MASTER;
 323                 break;
 324         default:
 325                 return -EINVAL;
 326         }
 327
 328         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 329         case SND_SOC_DAIFMT_I2S:
 330                 iface1A |= MAX9867_I2S_DLY;
 331                 break;
 332         case SND_SOC_DAIFMT_DSP_A:
 333                 iface1A |= MAX9867_TDM_MODE | MAX9867_SDOUT_HIZ;
 334                 break;
 335         default:
 336                 return -EINVAL;
 337         }
 338
 339         /* Clock inversion bits, BCI and WCI */
 340         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 341         case SND_SOC_DAIFMT_NB_NF:
 342                 break;
 343         case SND_SOC_DAIFMT_IB_IF:
 344                 iface1A |= MAX9867_WCI_MODE | MAX9867_BCI_MODE;
 345                 break;
 346         case SND_SOC_DAIFMT_IB_NF:
 347                 iface1A |= MAX9867_BCI_MODE;
 348                 break;
 349         case SND_SOC_DAIFMT_NB_IF:
 350                 iface1A |= MAX9867_WCI_MODE;
 351                 break;
 352         default:
 353                 return -EINVAL;
 354         }
 355
 356         regmap_write(max9867->regmap, MAX9867_IFC1A, iface1A);
 357         regmap_write(max9867->regmap, MAX9867_IFC1B, iface1B);
 358         return 0;
 359 }
 360
 361 static const struct snd_soc_dai_ops max9867_dai_ops = {
 362         .set_fmt = max9867_dai_set_fmt,
 363         .set_sysclk     = max9867_set_dai_sysclk,
 364         .prepare        = max9867_prepare,
 365         .digital_mute   = max9867_mute,
 366         .hw_params = max9867_dai_hw_params,
 367 };
 368
 369 #define MAX9867_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
 370         SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
 371 #define MAX9867_FORMATS (SNDRV_PCM_FMTBIT_S16_LE)
 372
 373 static struct snd_soc_dai_driver max9867_dai[] = {
 374         {
 375         .name = "max9867-aif1",
 376         .playback = {
 377                 .stream_name = "HiFi Playback",
 378                 .channels_min = 2,
 379                 .channels_max = 2,
 380                 .rates = MAX9867_RATES,
 381                 .formats = MAX9867_FORMATS,
 382         },
 383         .capture = {
 384                 .stream_name = "HiFi Capture",
 385                 .channels_min = 2,
 386                 .channels_max = 2,
 387                 .rates = MAX9867_RATES,
 388                 .formats = MAX9867_FORMATS,
 389         },
 390         .ops = &max9867_dai_ops,
 391         .symmetric_rates = 1,
 392         }
 393 };
 394
 395 #ifdef CONFIG_PM_SLEEP
 396 static int max9867_suspend(struct device *dev)
 397 {
 398         struct max9867_priv *max9867 = dev_get_drvdata(dev);
 399
 400         /* Drop down to power saving mode when system is suspended */
 401         regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
 402                 MAX9867_SHTDOWN_MASK, ~MAX9867_SHTDOWN_MASK);
 403         return 0;
 404 }
 405
 406 static int max9867_resume(struct device *dev)
 407 {
 408         struct max9867_priv *max9867 = dev_get_drvdata(dev);
 409
 410         regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
 411                 MAX9867_SHTDOWN_MASK, MAX9867_SHTDOWN_MASK);
 412         return 0;
 413 }
 414 #endif
 415
 416 static const struct snd_soc_component_driver max9867_component = {
 417         .controls               = max9867_snd_controls,
 418         .num_controls           = ARRAY_SIZE(max9867_snd_controls),
 419         .dapm_routes            = max9867_audio_map,
 420         .num_dapm_routes        = ARRAY_SIZE(max9867_audio_map),
 421         .dapm_widgets           = max9867_dapm_widgets,
 422         .num_dapm_widgets       = ARRAY_SIZE(max9867_dapm_widgets),
 423         .idle_bias_on           = 1,
 424         .use_pmdown_time        = 1,
 425         .endianness             = 1,
 426         .non_legacy_dai_naming  = 1,
 427 };
 428
 429 static bool max9867_volatile_register(struct device *dev, unsigned int reg)
 430 {
 431         switch (reg) {
 432         case MAX9867_STATUS:
 433         case MAX9867_JACKSTATUS:
 434         case MAX9867_AUXHIGH:
 435         case MAX9867_AUXLOW:
 436                 return true;
 437         default:
 438                 return false;
 439         }
 440 }
 441
 442 static const struct reg_default max9867_reg[] = {
 443         { 0x04, 0x00 },
 444         { 0x05, 0x00 },
 445         { 0x06, 0x00 },
 446         { 0x07, 0x00 },
 447         { 0x08, 0x00 },
 448         { 0x09, 0x00 },
 449         { 0x0A, 0x00 },
 450         { 0x0B, 0x00 },
 451         { 0x0C, 0x00 },
 452         { 0x0D, 0x00 },
 453         { 0x0E, 0x00 },
 454         { 0x0F, 0x00 },
 455         { 0x10, 0x00 },
 456         { 0x11, 0x00 },
 457         { 0x12, 0x00 },
 458         { 0x13, 0x00 },
 459         { 0x14, 0x00 },
 460         { 0x15, 0x00 },
 461         { 0x16, 0x00 },
 462         { 0x17, 0x00 },
 463 };
 464
 465 static const struct regmap_config max9867_regmap = {
 466         .reg_bits       = 8,
 467         .val_bits       = 8,
 468         .max_register   = MAX9867_REVISION,
 469         .reg_defaults   = max9867_reg,
 470         .num_reg_defaults = ARRAY_SIZE(max9867_reg),
 471         .volatile_reg   = max9867_volatile_register,
 472         .cache_type     = REGCACHE_RBTREE,
 473 };
 474
 475 static int max9867_i2c_probe(struct i2c_client *i2c,
 476                 const struct i2c_device_id *id)
 477 {
 478         struct max9867_priv *max9867;
 479         int ret = 0, reg;
 480
 481         max9867 = devm_kzalloc(&i2c->dev,
 482                         sizeof(*max9867), GFP_KERNEL);
 483         if (!max9867)
 484                 return -ENOMEM;
 485
 486         i2c_set_clientdata(i2c, max9867);
 487         max9867->regmap = devm_regmap_init_i2c(i2c, &max9867_regmap);
 488         if (IS_ERR(max9867->regmap)) {
 489                 ret = PTR_ERR(max9867->regmap);
 490                 dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
 491                 return ret;
 492         }
 493         ret = regmap_read(max9867->regmap,
 494                         MAX9867_REVISION, &reg);
 495         if (ret < 0) {
 496                 dev_err(&i2c->dev, "Failed to read: %d\n", ret);
 497                 return ret;
 498         }
 499         dev_info(&i2c->dev, "device revision: %x\n", reg);
 500         ret = devm_snd_soc_register_component(&i2c->dev, &max9867_component,
 501                         max9867_dai, ARRAY_SIZE(max9867_dai));
 502         if (ret < 0) {
 503                 dev_err(&i2c->dev, "Failed to register component: %d\n", ret);
 504                 return ret;
 505         }
 506         return ret;
 507 }
 508
 509 static const struct i2c_device_id max9867_i2c_id[] = {
 510         { "max9867", 0 },
 511         { }
 512 };
 513 MODULE_DEVICE_TABLE(i2c, max9867_i2c_id);
 514
 515 static const struct of_device_id max9867_of_match[] = {
 516         { .compatible = "maxim,max9867", },
 517         { }
 518 };
 519 MODULE_DEVICE_TABLE(of, max9867_of_match);
 520
 521 static const struct dev_pm_ops max9867_pm_ops = {
 522         SET_SYSTEM_SLEEP_PM_OPS(max9867_suspend, max9867_resume)
 523 };
 524
 525 static struct i2c_driver max9867_i2c_driver = {
 526         .driver = {
 527                 .name = "max9867",
 528                 .of_match_table = of_match_ptr(max9867_of_match),
 529                 .pm = &max9867_pm_ops,
 530         },
 531         .probe  = max9867_i2c_probe,
 532         .id_table = max9867_i2c_id,
 533 };
 534
 535 module_i2c_driver(max9867_i2c_driver);
 536
 537 MODULE_AUTHOR("anish kumar <yesanishhere@gmail.com>");
 538 MODULE_DESCRIPTION("ALSA SoC MAX9867 driver");
 539 MODULE_LICENSE("GPL");