sound/soc/codecs/tas2764.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Driver for the Texas Instruments TAS2764 CODEC
   4 // Copyright (C) 2020 Texas Instruments Inc.
   5
   6 #include <linux/module.h>
   7 #include <linux/moduleparam.h>
   8 #include <linux/err.h>
   9 #include <linux/init.h>
  10 #include <linux/delay.h>
  11 #include <linux/pm.h>
  12 #include <linux/i2c.h>
  13 #include <linux/gpio.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/regmap.h>
  17 #include <linux/of.h>
  18 #include <linux/of_gpio.h>
  19 #include <linux/slab.h>
  20 #include <sound/soc.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/initval.h>
  24 #include <sound/tlv.h>
  25
  26 #include "tas2764.h"
  27
  28 struct tas2764_priv {
  29         struct snd_soc_component *component;
  30         struct gpio_desc *reset_gpio;
  31         struct gpio_desc *sdz_gpio;
  32         struct regmap *regmap;
  33         struct device *dev;
  34
  35         int v_sense_slot;
  36         int i_sense_slot;
  37 };
  38
  39 static void tas2764_reset(struct tas2764_priv *tas2764)
  40 {
  41         if (tas2764->reset_gpio) {
  42                 gpiod_set_value_cansleep(tas2764->reset_gpio, 0);
  43                 msleep(20);
  44                 gpiod_set_value_cansleep(tas2764->reset_gpio, 1);
  45         }
  46
  47         snd_soc_component_write(tas2764->component, TAS2764_SW_RST,
  48                                 TAS2764_RST);
  49 }
  50
  51 static int tas2764_set_bias_level(struct snd_soc_component *component,
  52                                  enum snd_soc_bias_level level)
  53 {
  54         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
  55
  56         switch (level) {
  57         case SND_SOC_BIAS_ON:
  58                 snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
  59                                               TAS2764_PWR_CTRL_MASK,
  60                                               TAS2764_PWR_CTRL_ACTIVE);
  61                 break;
  62         case SND_SOC_BIAS_STANDBY:
  63         case SND_SOC_BIAS_PREPARE:
  64                 snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
  65                                               TAS2764_PWR_CTRL_MASK,
  66                                               TAS2764_PWR_CTRL_MUTE);
  67                 break;
  68         case SND_SOC_BIAS_OFF:
  69                 snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
  70                                               TAS2764_PWR_CTRL_MASK,
  71                                               TAS2764_PWR_CTRL_SHUTDOWN);
  72                 break;
  73
  74         default:
  75                 dev_err(tas2764->dev,
  76                                 "wrong power level setting %d\n", level);
  77                 return -EINVAL;
  78         }
  79
  80         return 0;
  81 }
  82
  83 #ifdef CONFIG_PM
  84 static int tas2764_codec_suspend(struct snd_soc_component *component)
  85 {
  86         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
  87         int ret;
  88
  89         ret = snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
  90                                             TAS2764_PWR_CTRL_MASK,
  91                                             TAS2764_PWR_CTRL_SHUTDOWN);
  92
  93         if (ret < 0)
  94                 return ret;
  95
  96         if (tas2764->sdz_gpio)
  97                 gpiod_set_value_cansleep(tas2764->sdz_gpio, 0);
  98
  99         regcache_cache_only(tas2764->regmap, true);
 100         regcache_mark_dirty(tas2764->regmap);
 101
 102         return 0;
 103 }
 104
 105 static int tas2764_codec_resume(struct snd_soc_component *component)
 106 {
 107         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
 108         int ret;
 109
 110         if (tas2764->sdz_gpio)
 111                 gpiod_set_value_cansleep(tas2764->sdz_gpio, 1);
 112
 113         ret = snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
 114                                             TAS2764_PWR_CTRL_MASK,
 115                                             TAS2764_PWR_CTRL_ACTIVE);
 116
 117         if (ret < 0)
 118                 return ret;
 119
 120         regcache_cache_only(tas2764->regmap, false);
 121
 122         return regcache_sync(tas2764->regmap);
 123 }
 124 #else
 125 #define tas2764_codec_suspend NULL
 126 #define tas2764_codec_resume NULL
 127 #endif
 128
 129 static const char * const tas2764_ASI1_src[] = {
 130         "I2C offset", "Left", "Right", "LeftRightDiv2",
 131 };
 132
 133 static SOC_ENUM_SINGLE_DECL(
 134         tas2764_ASI1_src_enum, TAS2764_TDM_CFG2, 4, tas2764_ASI1_src);
 135
 136 static const struct snd_kcontrol_new tas2764_asi1_mux =
 137         SOC_DAPM_ENUM("ASI1 Source", tas2764_ASI1_src_enum);
 138
 139 static int tas2764_dac_event(struct snd_soc_dapm_widget *w,
 140                              struct snd_kcontrol *kcontrol, int event)
 141 {
 142         struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
 143         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
 144         int ret;
 145
 146         switch (event) {
 147         case SND_SOC_DAPM_POST_PMU:
 148                 ret = snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
 149                                                     TAS2764_PWR_CTRL_MASK,
 150                                                     TAS2764_PWR_CTRL_MUTE);
 151                 break;
 152         case SND_SOC_DAPM_PRE_PMD:
 153                 ret = snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
 154                                                     TAS2764_PWR_CTRL_MASK,
 155                                                     TAS2764_PWR_CTRL_SHUTDOWN);
 156                 break;
 157         default:
 158                 dev_err(tas2764->dev, "Unsupported event\n");
 159                 return -EINVAL;
 160         }
 161
 162         if (ret < 0)
 163                 return ret;
 164
 165         return 0;
 166 }
 167
 168 static const struct snd_kcontrol_new isense_switch =
 169         SOC_DAPM_SINGLE("Switch", TAS2764_PWR_CTRL, TAS2764_ISENSE_POWER_EN, 1, 1);
 170 static const struct snd_kcontrol_new vsense_switch =
 171         SOC_DAPM_SINGLE("Switch", TAS2764_PWR_CTRL, TAS2764_VSENSE_POWER_EN, 1, 1);
 172
 173 static const struct snd_soc_dapm_widget tas2764_dapm_widgets[] = {
 174         SND_SOC_DAPM_AIF_IN("ASI1", "ASI1 Playback", 0, SND_SOC_NOPM, 0, 0),
 175         SND_SOC_DAPM_MUX("ASI1 Sel", SND_SOC_NOPM, 0, 0, &tas2764_asi1_mux),
 176         SND_SOC_DAPM_SWITCH("ISENSE", TAS2764_PWR_CTRL, TAS2764_ISENSE_POWER_EN,
 177                             1, &isense_switch),
 178         SND_SOC_DAPM_SWITCH("VSENSE", TAS2764_PWR_CTRL, TAS2764_VSENSE_POWER_EN,
 179                             1, &vsense_switch),
 180         SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas2764_dac_event,
 181                            SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 182         SND_SOC_DAPM_OUTPUT("OUT"),
 183         SND_SOC_DAPM_SIGGEN("VMON"),
 184         SND_SOC_DAPM_SIGGEN("IMON")
 185 };
 186
 187 static const struct snd_soc_dapm_route tas2764_audio_map[] = {
 188         {"ASI1 Sel", "I2C offset", "ASI1"},
 189         {"ASI1 Sel", "Left", "ASI1"},
 190         {"ASI1 Sel", "Right", "ASI1"},
 191         {"ASI1 Sel", "LeftRightDiv2", "ASI1"},
 192         {"DAC", NULL, "ASI1 Sel"},
 193         {"OUT", NULL, "DAC"},
 194         {"ISENSE", "Switch", "IMON"},
 195         {"VSENSE", "Switch", "VMON"},
 196 };
 197
 198 static int tas2764_mute(struct snd_soc_dai *dai, int mute, int direction)
 199 {
 200         struct snd_soc_component *component = dai->component;
 201         int ret;
 202
 203         ret = snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
 204                                             TAS2764_PWR_CTRL_MASK,
 205                                             mute ? TAS2764_PWR_CTRL_MUTE : 0);
 206
 207         if (ret < 0)
 208                 return ret;
 209
 210         return 0;
 211 }
 212
 213 static int tas2764_set_bitwidth(struct tas2764_priv *tas2764, int bitwidth)
 214 {
 215         struct snd_soc_component *component = tas2764->component;
 216         int sense_en;
 217         int val;
 218         int ret;
 219
 220         switch (bitwidth) {
 221         case SNDRV_PCM_FORMAT_S16_LE:
 222                 ret = snd_soc_component_update_bits(component,
 223                                                     TAS2764_TDM_CFG2,
 224                                                     TAS2764_TDM_CFG2_RXW_MASK,
 225                                                     TAS2764_TDM_CFG2_RXW_16BITS);
 226                 break;
 227         case SNDRV_PCM_FORMAT_S24_LE:
 228                 ret = snd_soc_component_update_bits(component,
 229                                                     TAS2764_TDM_CFG2,
 230                                                     TAS2764_TDM_CFG2_RXW_MASK,
 231                                                     TAS2764_TDM_CFG2_RXW_24BITS);
 232                 break;
 233         case SNDRV_PCM_FORMAT_S32_LE:
 234                 ret = snd_soc_component_update_bits(component,
 235                                                     TAS2764_TDM_CFG2,
 236                                                     TAS2764_TDM_CFG2_RXW_MASK,
 237                                                     TAS2764_TDM_CFG2_RXW_32BITS);
 238                 break;
 239
 240         default:
 241                 return -EINVAL;
 242         }
 243
 244         if (ret < 0)
 245                 return ret;
 246
 247         val = snd_soc_component_read(tas2764->component, TAS2764_PWR_CTRL);
 248         if (val < 0)
 249                 return val;
 250
 251         if (val & (1 << TAS2764_VSENSE_POWER_EN))
 252                 sense_en = 0;
 253         else
 254                 sense_en = TAS2764_TDM_CFG5_VSNS_ENABLE;
 255
 256         ret = snd_soc_component_update_bits(tas2764->component, TAS2764_TDM_CFG5,
 257                                             TAS2764_TDM_CFG5_VSNS_ENABLE,
 258                                             sense_en);
 259         if (ret < 0)
 260                 return ret;
 261
 262         if (val & (1 << TAS2764_ISENSE_POWER_EN))
 263                 sense_en = 0;
 264         else
 265                 sense_en = TAS2764_TDM_CFG6_ISNS_ENABLE;
 266
 267         ret = snd_soc_component_update_bits(tas2764->component, TAS2764_TDM_CFG6,
 268                                             TAS2764_TDM_CFG6_ISNS_ENABLE,
 269                                             sense_en);
 270         if (ret < 0)
 271                 return ret;
 272
 273         return 0;
 274 }
 275
 276 static int tas2764_set_samplerate(struct tas2764_priv *tas2764, int samplerate)
 277 {
 278         struct snd_soc_component *component = tas2764->component;
 279         int ramp_rate_val;
 280         int ret;
 281
 282         switch (samplerate) {
 283         case 48000:
 284                 ramp_rate_val = TAS2764_TDM_CFG0_SMP_48KHZ |
 285                                 TAS2764_TDM_CFG0_44_1_48KHZ;
 286                 break;
 287         case 44100:
 288                 ramp_rate_val = TAS2764_TDM_CFG0_SMP_44_1KHZ |
 289                                 TAS2764_TDM_CFG0_44_1_48KHZ;
 290                 break;
 291         case 96000:
 292                 ramp_rate_val = TAS2764_TDM_CFG0_SMP_48KHZ |
 293                                 TAS2764_TDM_CFG0_88_2_96KHZ;
 294                 break;
 295         case 88200:
 296                 ramp_rate_val = TAS2764_TDM_CFG0_SMP_44_1KHZ |
 297                                 TAS2764_TDM_CFG0_88_2_96KHZ;
 298                 break;
 299         default:
 300                 return -EINVAL;
 301         }
 302
 303         ret = snd_soc_component_update_bits(component, TAS2764_TDM_CFG0,
 304                                             TAS2764_TDM_CFG0_SMP_MASK |
 305                                             TAS2764_TDM_CFG0_MASK,
 306                                             ramp_rate_val);
 307         if (ret < 0)
 308                 return ret;
 309
 310         return 0;
 311 }
 312
 313 static int tas2764_hw_params(struct snd_pcm_substream *substream,
 314                              struct snd_pcm_hw_params *params,
 315                              struct snd_soc_dai *dai)
 316 {
 317         struct snd_soc_component *component = dai->component;
 318         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
 319         int ret;
 320
 321         ret = tas2764_set_bitwidth(tas2764, params_format(params));
 322         if (ret < 0)
 323                 return ret;
 324
 325         return tas2764_set_samplerate(tas2764, params_rate(params));
 326 }
 327
 328 static int tas2764_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 329 {
 330         struct snd_soc_component *component = dai->component;
 331         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
 332         u8 tdm_rx_start_slot = 0, asi_cfg_1 = 0;
 333         int iface;
 334         int ret;
 335
 336         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 337         case SND_SOC_DAIFMT_NB_NF:
 338                 asi_cfg_1 = TAS2764_TDM_CFG1_RX_RISING;
 339                 break;
 340         case SND_SOC_DAIFMT_IB_NF:
 341                 asi_cfg_1 = TAS2764_TDM_CFG1_RX_FALLING;
 342                 break;
 343         default:
 344                 dev_err(tas2764->dev, "ASI format Inverse is not found\n");
 345                 return -EINVAL;
 346         }
 347
 348         ret = snd_soc_component_update_bits(component, TAS2764_TDM_CFG1,
 349                                             TAS2764_TDM_CFG1_RX_MASK,
 350                                             asi_cfg_1);
 351         if (ret < 0)
 352                 return ret;
 353
 354         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 355         case SND_SOC_DAIFMT_I2S:
 356         case SND_SOC_DAIFMT_DSP_A:
 357                 iface = TAS2764_TDM_CFG2_SCFG_I2S;
 358                 tdm_rx_start_slot = 1;
 359                 break;
 360         case SND_SOC_DAIFMT_DSP_B:
 361         case SND_SOC_DAIFMT_LEFT_J:
 362                 iface = TAS2764_TDM_CFG2_SCFG_LEFT_J;
 363                 tdm_rx_start_slot = 0;
 364                 break;
 365         default:
 366                 dev_err(tas2764->dev,
 367                         "DAI Format is not found, fmt=0x%x\n", fmt);
 368                 return -EINVAL;
 369         }
 370
 371         ret = snd_soc_component_update_bits(component, TAS2764_TDM_CFG1,
 372                                             TAS2764_TDM_CFG1_MASK,
 373                                             (tdm_rx_start_slot << TAS2764_TDM_CFG1_51_SHIFT));
 374         if (ret < 0)
 375                 return ret;
 376
 377         ret = snd_soc_component_update_bits(component, TAS2764_TDM_CFG2,
 378                                             TAS2764_TDM_CFG2_SCFG_MASK, iface);
 379         if (ret < 0)
 380                 return ret;
 381
 382         return 0;
 383 }
 384
 385 static int tas2764_set_dai_tdm_slot(struct snd_soc_dai *dai,
 386                                 unsigned int tx_mask,
 387                                 unsigned int rx_mask,
 388                                 int slots, int slot_width)
 389 {
 390         struct snd_soc_component *component = dai->component;
 391         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
 392         int left_slot, right_slot;
 393         int slots_cfg;
 394         int slot_size;
 395         int ret;
 396
 397         if (tx_mask == 0 || rx_mask != 0)
 398                 return -EINVAL;
 399
 400         if (slots == 1) {
 401                 if (tx_mask != 1)
 402                         return -EINVAL;
 403                 left_slot = 0;
 404                 right_slot = 0;
 405         } else {
 406                 left_slot = __ffs(tx_mask);
 407                 tx_mask &= ~(1 << left_slot);
 408                 if (tx_mask == 0) {
 409                         right_slot = left_slot;
 410                 } else {
 411                         right_slot = __ffs(tx_mask);
 412                         tx_mask &= ~(1 << right_slot);
 413                 }
 414         }
 415
 416         if (tx_mask != 0 || left_slot >= slots || right_slot >= slots)
 417                 return -EINVAL;
 418
 419         slots_cfg = (right_slot << TAS2764_TDM_CFG3_RXS_SHIFT) | left_slot;
 420
 421         ret = snd_soc_component_write(component, TAS2764_TDM_CFG3, slots_cfg);
 422         if (ret)
 423                 return ret;
 424
 425         switch (slot_width) {
 426         case 16:
 427                 slot_size = TAS2764_TDM_CFG2_RXS_16BITS;
 428                 break;
 429         case 24:
 430                 slot_size = TAS2764_TDM_CFG2_RXS_24BITS;
 431                 break;
 432         case 32:
 433                 slot_size = TAS2764_TDM_CFG2_RXS_32BITS;
 434                 break;
 435         default:
 436                 return -EINVAL;
 437         }
 438
 439         ret = snd_soc_component_update_bits(component, TAS2764_TDM_CFG2,
 440                                             TAS2764_TDM_CFG2_RXS_MASK,
 441                                             slot_size);
 442         if (ret < 0)
 443                 return ret;
 444
 445         ret = snd_soc_component_update_bits(component, TAS2764_TDM_CFG5,
 446                                             TAS2764_TDM_CFG5_50_MASK,
 447                                             tas2764->v_sense_slot);
 448         if (ret < 0)
 449                 return ret;
 450
 451         ret = snd_soc_component_update_bits(component, TAS2764_TDM_CFG6,
 452                                             TAS2764_TDM_CFG6_50_MASK,
 453                                             tas2764->i_sense_slot);
 454         if (ret < 0)
 455                 return ret;
 456
 457         return 0;
 458 }
 459
 460 static struct snd_soc_dai_ops tas2764_dai_ops = {
 461         .mute_stream = tas2764_mute,
 462         .hw_params  = tas2764_hw_params,
 463         .set_fmt    = tas2764_set_fmt,
 464         .set_tdm_slot = tas2764_set_dai_tdm_slot,
 465         .no_capture_mute = 1,
 466 };
 467
 468 #define TAS2764_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 469                          SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 470
 471 #define TAS2764_RATES (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
 472                        SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_88200)
 473
 474 static struct snd_soc_dai_driver tas2764_dai_driver[] = {
 475         {
 476                 .name = "tas2764 ASI1",
 477                 .id = 0,
 478                 .playback = {
 479                         .stream_name    = "ASI1 Playback",
 480                         .channels_min   = 2,
 481                         .channels_max   = 2,
 482                         .rates      = TAS2764_RATES,
 483                         .formats    = TAS2764_FORMATS,
 484                 },
 485                 .capture = {
 486                         .stream_name    = "ASI1 Capture",
 487                         .channels_min   = 0,
 488                         .channels_max   = 2,
 489                         .rates = TAS2764_RATES,
 490                         .formats = TAS2764_FORMATS,
 491                 },
 492                 .ops = &tas2764_dai_ops,
 493                 .symmetric_rate = 1,
 494         },
 495 };
 496
 497 static int tas2764_codec_probe(struct snd_soc_component *component)
 498 {
 499         struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
 500         int ret;
 501
 502         tas2764->component = component;
 503
 504         if (tas2764->sdz_gpio)
 505                 gpiod_set_value_cansleep(tas2764->sdz_gpio, 1);
 506
 507         tas2764_reset(tas2764);
 508
 509         ret = snd_soc_component_update_bits(tas2764->component, TAS2764_TDM_CFG5,
 510                                             TAS2764_TDM_CFG5_VSNS_ENABLE, 0);
 511         if (ret < 0)
 512                 return ret;
 513
 514         ret = snd_soc_component_update_bits(tas2764->component, TAS2764_TDM_CFG6,
 515                                             TAS2764_TDM_CFG6_ISNS_ENABLE, 0);
 516         if (ret < 0)
 517                 return ret;
 518
 519         ret = snd_soc_component_update_bits(component, TAS2764_PWR_CTRL,
 520                                             TAS2764_PWR_CTRL_MASK,
 521                                             TAS2764_PWR_CTRL_MUTE);
 522         if (ret < 0)
 523                 return ret;
 524
 525         return 0;
 526 }
 527
 528 static DECLARE_TLV_DB_SCALE(tas2764_digital_tlv, 1100, 50, 0);
 529 static DECLARE_TLV_DB_SCALE(tas2764_playback_volume, -10000, 50, 0);
 530
 531 static const struct snd_kcontrol_new tas2764_snd_controls[] = {
 532         SOC_SINGLE_TLV("Speaker Volume", TAS2764_DVC, 0,
 533                        TAS2764_DVC_MAX, 1, tas2764_playback_volume),
 534         SOC_SINGLE_TLV("Amp Gain Volume", TAS2764_CHNL_0, 0, 0x14, 0,
 535                        tas2764_digital_tlv),
 536 };
 537
 538 static const struct snd_soc_component_driver soc_component_driver_tas2764 = {
 539         .probe                  = tas2764_codec_probe,
 540         .suspend                = tas2764_codec_suspend,
 541         .resume                 = tas2764_codec_resume,
 542         .set_bias_level         = tas2764_set_bias_level,
 543         .controls               = tas2764_snd_controls,
 544         .num_controls           = ARRAY_SIZE(tas2764_snd_controls),
 545         .dapm_widgets           = tas2764_dapm_widgets,
 546         .num_dapm_widgets       = ARRAY_SIZE(tas2764_dapm_widgets),
 547         .dapm_routes            = tas2764_audio_map,
 548         .num_dapm_routes        = ARRAY_SIZE(tas2764_audio_map),
 549         .idle_bias_on           = 1,
 550         .endianness             = 1,
 551         .non_legacy_dai_naming  = 1,
 552 };
 553
 554 static const struct reg_default tas2764_reg_defaults[] = {
 555         { TAS2764_PAGE, 0x00 },
 556         { TAS2764_SW_RST, 0x00 },
 557         { TAS2764_PWR_CTRL, 0x1a },
 558         { TAS2764_DVC, 0x00 },
 559         { TAS2764_CHNL_0, 0x00 },
 560         { TAS2764_TDM_CFG0, 0x09 },
 561         { TAS2764_TDM_CFG1, 0x02 },
 562         { TAS2764_TDM_CFG2, 0x0a },
 563         { TAS2764_TDM_CFG3, 0x10 },
 564         { TAS2764_TDM_CFG5, 0x42 },
 565 };
 566
 567 static const struct regmap_range_cfg tas2764_regmap_ranges[] = {
 568         {
 569                 .range_min = 0,
 570                 .range_max = 1 * 128,
 571                 .selector_reg = TAS2764_PAGE,
 572                 .selector_mask = 0xff,
 573                 .selector_shift = 0,
 574                 .window_start = 0,
 575                 .window_len = 128,
 576         },
 577 };
 578
 579 static const struct regmap_config tas2764_i2c_regmap = {
 580         .reg_bits = 8,
 581         .val_bits = 8,
 582         .reg_defaults = tas2764_reg_defaults,
 583         .num_reg_defaults = ARRAY_SIZE(tas2764_reg_defaults),
 584         .cache_type = REGCACHE_RBTREE,
 585         .ranges = tas2764_regmap_ranges,
 586         .num_ranges = ARRAY_SIZE(tas2764_regmap_ranges),
 587         .max_register = 1 * 128,
 588 };
 589
 590 static int tas2764_parse_dt(struct device *dev, struct tas2764_priv *tas2764)
 591 {
 592         int ret = 0;
 593
 594         tas2764->reset_gpio = devm_gpiod_get_optional(tas2764->dev, "reset",
 595                                                       GPIOD_OUT_HIGH);
 596         if (IS_ERR(tas2764->reset_gpio)) {
 597                 if (PTR_ERR(tas2764->reset_gpio) == -EPROBE_DEFER) {
 598                         tas2764->reset_gpio = NULL;
 599                         return -EPROBE_DEFER;
 600                 }
 601         }
 602
 603         tas2764->sdz_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
 604         if (IS_ERR(tas2764->sdz_gpio)) {
 605                 if (PTR_ERR(tas2764->sdz_gpio) == -EPROBE_DEFER)
 606                         return -EPROBE_DEFER;
 607
 608                 tas2764->sdz_gpio = NULL;
 609         }
 610
 611         ret = fwnode_property_read_u32(dev->fwnode, "ti,imon-slot-no",
 612                                        &tas2764->i_sense_slot);
 613         if (ret)
 614                 tas2764->i_sense_slot = 0;
 615
 616         ret = fwnode_property_read_u32(dev->fwnode, "ti,vmon-slot-no",
 617                                        &tas2764->v_sense_slot);
 618         if (ret)
 619                 tas2764->v_sense_slot = 2;
 620
 621         return 0;
 622 }
 623
 624 static int tas2764_i2c_probe(struct i2c_client *client,
 625                         const struct i2c_device_id *id)
 626 {
 627         struct tas2764_priv *tas2764;
 628         int result;
 629
 630         tas2764 = devm_kzalloc(&client->dev, sizeof(struct tas2764_priv),
 631                                GFP_KERNEL);
 632         if (!tas2764)
 633                 return -ENOMEM;
 634
 635         tas2764->dev = &client->dev;
 636         i2c_set_clientdata(client, tas2764);
 637         dev_set_drvdata(&client->dev, tas2764);
 638
 639         tas2764->regmap = devm_regmap_init_i2c(client, &tas2764_i2c_regmap);
 640         if (IS_ERR(tas2764->regmap)) {
 641                 result = PTR_ERR(tas2764->regmap);
 642                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
 643                                         result);
 644                 return result;
 645         }
 646
 647         if (client->dev.of_node) {
 648                 result = tas2764_parse_dt(&client->dev, tas2764);
 649                 if (result) {
 650                         dev_err(tas2764->dev, "%s: Failed to parse devicetree\n",
 651                                 __func__);
 652                         return result;
 653                 }
 654         }
 655
 656         return devm_snd_soc_register_component(tas2764->dev,
 657                                                &soc_component_driver_tas2764,
 658                                                tas2764_dai_driver,
 659                                                ARRAY_SIZE(tas2764_dai_driver));
 660 }
 661
 662 static const struct i2c_device_id tas2764_i2c_id[] = {
 663         { "tas2764", 0},
 664         { }
 665 };
 666 MODULE_DEVICE_TABLE(i2c, tas2764_i2c_id);
 667
 668 #if defined(CONFIG_OF)
 669 static const struct of_device_id tas2764_of_match[] = {
 670         { .compatible = "ti,tas2764" },
 671         {},
 672 };
 673 MODULE_DEVICE_TABLE(of, tas2764_of_match);
 674 #endif
 675
 676 static struct i2c_driver tas2764_i2c_driver = {
 677         .driver = {
 678                 .name   = "tas2764",
 679                 .of_match_table = of_match_ptr(tas2764_of_match),
 680         },
 681         .probe      = tas2764_i2c_probe,
 682         .id_table   = tas2764_i2c_id,
 683 };
 684 module_i2c_driver(tas2764_i2c_driver);
 685
 686 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
 687 MODULE_DESCRIPTION("TAS2764 I2C Smart Amplifier driver");
 688 MODULE_LICENSE("GPL v2");