sound/soc/codecs/src4xxx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // TI SRC4xxx Audio Codec driver
   4 //
   5 // Copyright 2021-2022 Deqx Pty Ltd
   6 // Author: Matt Flax <flatmax@flatmax.com>
   7
   8 #include <linux/module.h>
   9
  10 #include <sound/soc.h>
  11 #include <sound/tlv.h>
  12
  13 #include "src4xxx.h"
  14
  15 struct src4xxx {
  16         struct regmap *regmap;
  17         bool master[2];
  18         int mclk_hz;
  19         struct device *dev;
  20 };
  21
  22 enum {SRC4XXX_PORTA, SRC4XXX_PORTB};
  23
  24 /* SRC attenuation */
  25 static const DECLARE_TLV_DB_SCALE(src_tlv, -12750, 50, 0);
  26
  27 static const struct snd_kcontrol_new src4xxx_controls[] = {
  28         SOC_DOUBLE_R_TLV("SRC Volume",
  29                 SRC4XXX_SCR_CTL_30, SRC4XXX_SCR_CTL_31, 0, 255, 1, src_tlv),
  30 };
  31
  32 /* I2S port control */
  33 static const char * const port_out_src_text[] = {
  34         "loopback", "other_port", "DIR", "SRC"
  35 };
  36 static SOC_ENUM_SINGLE_DECL(porta_out_src_enum, SRC4XXX_PORTA_CTL_03, 4,
  37         port_out_src_text);
  38 static SOC_ENUM_SINGLE_DECL(portb_out_src_enum, SRC4XXX_PORTB_CTL_05, 4,
  39         port_out_src_text);
  40 static const struct snd_kcontrol_new porta_out_control =
  41         SOC_DAPM_ENUM("Port A source select", porta_out_src_enum);
  42 static const struct snd_kcontrol_new portb_out_control =
  43         SOC_DAPM_ENUM("Port B source select", portb_out_src_enum);
  44
  45 /* Digital audio transmitter control */
  46 static const char * const dit_mux_text[] = {"Port A", "Port B", "DIR", "SRC"};
  47 static SOC_ENUM_SINGLE_DECL(dit_mux_enum, SRC4XXX_TX_CTL_07, 3, dit_mux_text);
  48 static const struct snd_kcontrol_new dit_mux_control =
  49         SOC_DAPM_ENUM("DIT source", dit_mux_enum);
  50
  51 /* SRC control */
  52 static const char * const src_in_text[] = {"Port A", "Port B", "DIR"};
  53 static SOC_ENUM_SINGLE_DECL(src_in_enum, SRC4XXX_SCR_CTL_2D, 0, src_in_text);
  54 static const struct snd_kcontrol_new src_in_control =
  55         SOC_DAPM_ENUM("SRC source select", src_in_enum);
  56
  57 /* DIR control */
  58 static const char * const dir_in_text[] = {"Ch 1", "Ch 2", "Ch 3", "Ch 4"};
  59 static SOC_ENUM_SINGLE_DECL(dir_in_enum, SRC4XXX_RCV_CTL_0D, 0, dir_in_text);
  60 static const struct snd_kcontrol_new dir_in_control =
  61         SOC_DAPM_ENUM("Digital Input", dir_in_enum);
  62
  63 static const struct snd_soc_dapm_widget src4xxx_dapm_widgets[] = {
  64         SND_SOC_DAPM_INPUT("loopback_A"),
  65         SND_SOC_DAPM_INPUT("other_port_A"),
  66         SND_SOC_DAPM_INPUT("DIR_A"),
  67         SND_SOC_DAPM_INPUT("SRC_A"),
  68         SND_SOC_DAPM_MUX("Port A source",
  69                 SND_SOC_NOPM, 0, 0, &porta_out_control),
  70
  71         SND_SOC_DAPM_INPUT("loopback_B"),
  72         SND_SOC_DAPM_INPUT("other_port_B"),
  73         SND_SOC_DAPM_INPUT("DIR_B"),
  74         SND_SOC_DAPM_INPUT("SRC_B"),
  75         SND_SOC_DAPM_MUX("Port B source",
  76                 SND_SOC_NOPM, 0, 0, &portb_out_control),
  77
  78         SND_SOC_DAPM_INPUT("Port_A"),
  79         SND_SOC_DAPM_INPUT("Port_B"),
  80         SND_SOC_DAPM_INPUT("DIR_"),
  81
  82         /* Digital audio receivers and transmitters */
  83         SND_SOC_DAPM_OUTPUT("DIR_OUT"),
  84         SND_SOC_DAPM_OUTPUT("SRC_OUT"),
  85         SND_SOC_DAPM_MUX("DIT Out Src", SRC4XXX_PWR_RST_01,
  86                 SRC4XXX_ENABLE_DIT_SHIFT, 1, &dit_mux_control),
  87
  88         /* Audio Interface */
  89         SND_SOC_DAPM_AIF_IN("AIF_A_RX", "Playback A", 0,
  90                 SRC4XXX_PWR_RST_01, SRC4XXX_ENABLE_PORT_A_SHIFT, 1),
  91         SND_SOC_DAPM_AIF_OUT("AIF_A_TX", "Capture A", 0,
  92                 SRC4XXX_PWR_RST_01, SRC4XXX_ENABLE_PORT_A_SHIFT, 1),
  93         SND_SOC_DAPM_AIF_IN("AIF_B_RX", "Playback B", 0,
  94                 SRC4XXX_PWR_RST_01, SRC4XXX_ENABLE_PORT_B_SHIFT, 1),
  95         SND_SOC_DAPM_AIF_OUT("AIF_B_TX", "Capture B", 0,
  96                 SRC4XXX_PWR_RST_01, SRC4XXX_ENABLE_PORT_B_SHIFT, 1),
  97
  98         SND_SOC_DAPM_MUX("SRC source", SND_SOC_NOPM, 0, 0, &src_in_control),
  99
 100         SND_SOC_DAPM_INPUT("MCLK"),
 101         SND_SOC_DAPM_INPUT("RXMCLKI"),
 102         SND_SOC_DAPM_INPUT("RXMCLKO"),
 103
 104         SND_SOC_DAPM_INPUT("RX1"),
 105         SND_SOC_DAPM_INPUT("RX2"),
 106         SND_SOC_DAPM_INPUT("RX3"),
 107         SND_SOC_DAPM_INPUT("RX4"),
 108         SND_SOC_DAPM_MUX("Digital Input", SRC4XXX_PWR_RST_01,
 109                 SRC4XXX_ENABLE_DIR_SHIFT, 1, &dir_in_control),
 110 };
 111
 112 static const struct snd_soc_dapm_route src4xxx_audio_routes[] = {
 113         /* I2S Input to Output Routing */
 114         {"Port A source", "loopback", "loopback_A"},
 115         {"Port A source", "other_port", "other_port_A"},
 116         {"Port A source", "DIR", "DIR_A"},
 117         {"Port A source", "SRC", "SRC_A"},
 118         {"Port B source", "loopback", "loopback_B"},
 119         {"Port B source", "other_port", "other_port_B"},
 120         {"Port B source", "DIR", "DIR_B"},
 121         {"Port B source", "SRC", "SRC_B"},
 122         /* DIT muxing */
 123         {"DIT Out Src", "Port A", "Capture A"},
 124         {"DIT Out Src", "Port B", "Capture B"},
 125         {"DIT Out Src", "DIR", "DIR_OUT"},
 126         {"DIT Out Src", "SRC", "SRC_OUT"},
 127
 128         /* SRC input selection */
 129         {"SRC source", "Port A", "Port_A"},
 130         {"SRC source", "Port B", "Port_B"},
 131         {"SRC source", "DIR", "DIR_"},
 132         /* SRC mclk selection */
 133         {"SRC mclk source", "Master (MCLK)", "MCLK"},
 134         {"SRC mclk source", "Master (RXCLKI)", "RXMCLKI"},
 135         {"SRC mclk source", "Recovered receiver clk", "RXMCLKO"},
 136         /* DIR input selection */
 137         {"Digital Input", "Ch 1", "RX1"},
 138         {"Digital Input", "Ch 2", "RX2"},
 139         {"Digital Input", "Ch 3", "RX3"},
 140         {"Digital Input", "Ch 4", "RX4"},
 141 };
 142
 143
 144 static const struct snd_soc_component_driver src4xxx_driver = {
 145         .controls = src4xxx_controls,
 146         .num_controls = ARRAY_SIZE(src4xxx_controls),
 147
 148         .dapm_widgets = src4xxx_dapm_widgets,
 149         .num_dapm_widgets = ARRAY_SIZE(src4xxx_dapm_widgets),
 150         .dapm_routes = src4xxx_audio_routes,
 151         .num_dapm_routes = ARRAY_SIZE(src4xxx_audio_routes),
 152 };
 153
 154 static int src4xxx_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 155 {
 156         struct snd_soc_component *component = dai->component;
 157         struct src4xxx *src4xxx = snd_soc_component_get_drvdata(component);
 158         unsigned int ctrl;
 159
 160         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 161         case SND_SOC_DAIFMT_CBM_CFM:
 162                 ctrl = SRC4XXX_BUS_MASTER;
 163                 src4xxx->master[dai->id] = true;
 164                 break;
 165         case SND_SOC_DAIFMT_CBS_CFS:
 166                 ctrl = 0;
 167                 src4xxx->master[dai->id] = false;
 168                 break;
 169         default:
 170                 return -EINVAL;
 171                 break;
 172         }
 173
 174         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 175         case SND_SOC_DAIFMT_I2S:
 176                 ctrl |= SRC4XXX_BUS_I2S;
 177                 break;
 178         case SND_SOC_DAIFMT_LEFT_J:
 179                 ctrl |= SRC4XXX_BUS_LEFT_J;
 180                 break;
 181         case SND_SOC_DAIFMT_RIGHT_J:
 182                 ctrl |= SRC4XXX_BUS_RIGHT_J_24;
 183                 break;
 184         default:
 185                 return -EINVAL;
 186                 break;
 187         }
 188
 189         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 190         case SND_SOC_DAIFMT_NB_NF:
 191                 break;
 192         default:
 193                 return -EINVAL;
 194                 break;
 195         }
 196
 197         regmap_update_bits(src4xxx->regmap, SRC4XXX_BUS_FMT(dai->id),
 198                 SRC4XXX_BUS_FMT_MS_MASK, ctrl);
 199
 200         return 0;
 201 }
 202
 203 static int src4xxx_set_mclk_hz(struct snd_soc_dai *codec_dai,
 204                 int clk_id, unsigned int freq, int dir)
 205 {
 206         struct snd_soc_component *component = codec_dai->component;
 207         struct src4xxx *src4xxx = snd_soc_component_get_drvdata(component);
 208
 209         dev_info(component->dev, "changing mclk rate from %d to %d Hz\n",
 210                 src4xxx->mclk_hz, freq);
 211         src4xxx->mclk_hz = freq;
 212
 213         return 0;
 214 }
 215
 216 static int src4xxx_hw_params(struct snd_pcm_substream *substream,
 217                         struct snd_pcm_hw_params *params,
 218                         struct snd_soc_dai *dai)
 219 {
 220         struct snd_soc_component *component = dai->component;
 221         struct src4xxx *src4xxx = snd_soc_component_get_drvdata(component);
 222         unsigned int mclk_div;
 223         int val, pj, jd, d;
 224         int reg;
 225         int ret;
 226
 227         switch (dai->id) {
 228         case SRC4XXX_PORTB:
 229                 reg = SRC4XXX_PORTB_CTL_06;
 230                 break;
 231         default:
 232                 reg = SRC4XXX_PORTA_CTL_04;
 233                 break;
 234         }
 235
 236         if (src4xxx->master[dai->id]) {
 237                 mclk_div = src4xxx->mclk_hz/params_rate(params);
 238                 if (src4xxx->mclk_hz != mclk_div*params_rate(params)) {
 239                         dev_err(component->dev,
 240                                 "mclk %d / rate %d has a remainder.\n",
 241                                 src4xxx->mclk_hz, params_rate(params));
 242                         return -EINVAL;
 243                 }
 244
 245                 val = ((int)mclk_div - 128) / 128;
 246                 if ((val < 0) | (val > 3)) {
 247                         dev_err(component->dev,
 248                                 "div register setting %d is out of range\n",
 249                                 val);
 250                         dev_err(component->dev,
 251                                 "unsupported sample rate %d Hz for the master clock of %d Hz\n",
 252                                 params_rate(params), src4xxx->mclk_hz);
 253                         return -EINVAL;
 254                 }
 255
 256                 /* set the TX DIV */
 257                 ret = regmap_update_bits(src4xxx->regmap,
 258                         SRC4XXX_TX_CTL_07, SRC4XXX_TX_MCLK_DIV_MASK,
 259                         val<<SRC4XXX_TX_MCLK_DIV_SHIFT);
 260                 if (ret) {
 261                         dev_err(component->dev,
 262                                 "Couldn't set the TX's div register to %d << %d = 0x%x\n",
 263                                 val, SRC4XXX_TX_MCLK_DIV_SHIFT,
 264                                 val<<SRC4XXX_TX_MCLK_DIV_SHIFT);
 265                         return ret;
 266                 }
 267
 268                 /* set the PLL for the digital receiver */
 269                 switch (src4xxx->mclk_hz) {
 270                 case 24576000:
 271                         pj = 0x22;
 272                         jd = 0x00;
 273                         d = 0x00;
 274                         break;
 275                 case 22579200:
 276                         pj = 0x22;
 277                         jd = 0x1b;
 278                         d = 0xa3;
 279                         break;
 280                 default:
 281                         /* don't error out here,
 282                          * other parts of the chip are still functional
 283                          * Dummy initialize variables to avoid
 284                          * -Wsometimes-uninitialized from clang.
 285                          */
 286                         dev_info(component->dev,
 287                                 "Couldn't set the RCV PLL as this master clock rate is unknown. Chosen regmap values may not match real world values.\n");
 288                         pj = 0x0;
 289                         jd = 0xff;
 290                         d = 0xff;
 291                         break;
 292                 }
 293                 ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_0F, pj);
 294                 if (ret < 0)
 295                         dev_err(component->dev,
 296                                 "Failed to update PLL register 0x%x\n",
 297                                 SRC4XXX_RCV_PLL_0F);
 298                 ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_10, jd);
 299                 if (ret < 0)
 300                         dev_err(component->dev,
 301                                 "Failed to update PLL register 0x%x\n",
 302                                 SRC4XXX_RCV_PLL_10);
 303                 ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_11, d);
 304                 if (ret < 0)
 305                         dev_err(component->dev,
 306                                 "Failed to update PLL register 0x%x\n",
 307                                 SRC4XXX_RCV_PLL_11);
 308
 309                 ret = regmap_update_bits(src4xxx->regmap,
 310                         SRC4XXX_TX_CTL_07, SRC4XXX_TX_MCLK_DIV_MASK,
 311                         val<<SRC4XXX_TX_MCLK_DIV_SHIFT);
 312                 if (ret < 0) {
 313                         dev_err(component->dev,
 314                                 "Couldn't set the TX's div register to %d << %d = 0x%x\n",
 315                                 val, SRC4XXX_TX_MCLK_DIV_SHIFT,
 316                                 val<<SRC4XXX_TX_MCLK_DIV_SHIFT);
 317                         return ret;
 318                 }
 319
 320                 return regmap_update_bits(src4xxx->regmap, reg,
 321                                         SRC4XXX_MCLK_DIV_MASK, val);
 322         } else {
 323                 dev_info(dai->dev, "not setting up MCLK as not master\n");
 324         }
 325
 326         return 0;
 327 };
 328
 329 static const struct snd_soc_dai_ops src4xxx_dai_ops = {
 330         .hw_params      = src4xxx_hw_params,
 331         .set_sysclk     = src4xxx_set_mclk_hz,
 332         .set_fmt        = src4xxx_set_dai_fmt,
 333 };
 334
 335 #define SRC4XXX_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |      SNDRV_PCM_FMTBIT_S32_LE)
 336 #define SRC4XXX_RATES (SNDRV_PCM_RATE_44100|SNDRV_PCM_RATE_48000|\
 337                                 SNDRV_PCM_RATE_88200|\
 338                                 SNDRV_PCM_RATE_96000|\
 339                                 SNDRV_PCM_RATE_176400|\
 340                                 SNDRV_PCM_RATE_192000)
 341
 342 static struct snd_soc_dai_driver src4xxx_dai_driver[] = {
 343         {
 344                 .id = SRC4XXX_PORTA,
 345                 .name = "src4xxx-portA",
 346                 .playback = {
 347                         .stream_name = "Playback A",
 348                         .channels_min = 2,
 349                         .channels_max = 2,
 350                         .rates = SRC4XXX_RATES,
 351                         .formats = SRC4XXX_FORMATS,
 352                 },
 353                 .capture = {
 354                         .stream_name = "Capture A",
 355                         .channels_min = 2,
 356                         .channels_max = 2,
 357                         .rates = SRC4XXX_RATES,
 358                         .formats = SRC4XXX_FORMATS,
 359                 },
 360                 .ops = &src4xxx_dai_ops,
 361         },
 362         {
 363                 .id = SRC4XXX_PORTB,
 364                 .name = "src4xxx-portB",
 365                 .playback = {
 366                         .stream_name = "Playback B",
 367                         .channels_min = 2,
 368                         .channels_max = 2,
 369                         .rates = SRC4XXX_RATES,
 370                         .formats = SRC4XXX_FORMATS,
 371                 },
 372                 .capture = {
 373                         .stream_name = "Capture B",
 374                         .channels_min = 2,
 375                         .channels_max = 2,
 376                         .rates = SRC4XXX_RATES,
 377                         .formats = SRC4XXX_FORMATS,
 378                 },
 379                 .ops = &src4xxx_dai_ops,
 380         },
 381 };
 382
 383 static const struct reg_default src4xxx_reg_defaults[] = {
 384         { SRC4XXX_PWR_RST_01,           0x00 }, /* all powered down intially */
 385         { SRC4XXX_PORTA_CTL_03,         0x00 },
 386         { SRC4XXX_PORTA_CTL_04,         0x00 },
 387         { SRC4XXX_PORTB_CTL_05,         0x00 },
 388         { SRC4XXX_PORTB_CTL_06,         0x00 },
 389         { SRC4XXX_TX_CTL_07,            0x00 },
 390         { SRC4XXX_TX_CTL_08,            0x00 },
 391         { SRC4XXX_TX_CTL_09,            0x00 },
 392         { SRC4XXX_SRC_DIT_IRQ_MSK_0B,   0x00 },
 393         { SRC4XXX_SRC_DIT_IRQ_MODE_0C,  0x00 },
 394         { SRC4XXX_RCV_CTL_0D,           0x00 },
 395         { SRC4XXX_RCV_CTL_0E,           0x00 },
 396         { SRC4XXX_RCV_PLL_0F,           0x00 }, /* not spec. in the datasheet */
 397         { SRC4XXX_RCV_PLL_10,           0xff }, /* not spec. in the datasheet */
 398         { SRC4XXX_RCV_PLL_11,           0xff }, /* not spec. in the datasheet */
 399         { SRC4XXX_RVC_IRQ_MSK_16,       0x00 },
 400         { SRC4XXX_RVC_IRQ_MSK_17,       0x00 },
 401         { SRC4XXX_RVC_IRQ_MODE_18,      0x00 },
 402         { SRC4XXX_RVC_IRQ_MODE_19,      0x00 },
 403         { SRC4XXX_RVC_IRQ_MODE_1A,      0x00 },
 404         { SRC4XXX_GPIO_1_1B,            0x00 },
 405         { SRC4XXX_GPIO_2_1C,            0x00 },
 406         { SRC4XXX_GPIO_3_1D,            0x00 },
 407         { SRC4XXX_GPIO_4_1E,            0x00 },
 408         { SRC4XXX_SCR_CTL_2D,           0x00 },
 409         { SRC4XXX_SCR_CTL_2E,           0x00 },
 410         { SRC4XXX_SCR_CTL_2F,           0x00 },
 411         { SRC4XXX_SCR_CTL_30,           0x00 },
 412         { SRC4XXX_SCR_CTL_31,           0x00 },
 413 };
 414
 415 int src4xxx_probe(struct device *dev, struct regmap *regmap,
 416                         void (*switch_mode)(struct device *dev))
 417 {
 418         struct src4xxx *src4xxx;
 419         int ret;
 420
 421         if (IS_ERR(regmap))
 422                 return PTR_ERR(regmap);
 423
 424         src4xxx = devm_kzalloc(dev, sizeof(*src4xxx), GFP_KERNEL);
 425         if (!src4xxx)
 426                 return -ENOMEM;
 427
 428         src4xxx->regmap = regmap;
 429         src4xxx->dev = dev;
 430         src4xxx->mclk_hz = 0; /* mclk has not been configured yet */
 431         dev_set_drvdata(dev, src4xxx);
 432
 433         ret = regmap_write(regmap, SRC4XXX_PWR_RST_01, SRC4XXX_RESET);
 434         if (ret < 0)
 435                 dev_err(dev, "Failed to issue reset: %d\n", ret);
 436         usleep_range(1, 500); /* sleep for more then 500 ns */
 437         ret = regmap_write(regmap, SRC4XXX_PWR_RST_01, SRC4XXX_POWER_DOWN);
 438         if (ret < 0)
 439                 dev_err(dev, "Failed to decommission reset: %d\n", ret);
 440         usleep_range(500, 1000); /* sleep for 500 us or more */
 441
 442         ret = regmap_update_bits(src4xxx->regmap, SRC4XXX_PWR_RST_01,
 443                 SRC4XXX_POWER_ENABLE, SRC4XXX_POWER_ENABLE);
 444         if (ret < 0)
 445                 dev_err(dev, "Failed to port A and B : %d\n", ret);
 446
 447         /* set receiver to use master clock (rcv mclk is most likely jittery) */
 448         ret = regmap_update_bits(src4xxx->regmap, SRC4XXX_RCV_CTL_0D,
 449                 SRC4XXX_RXCLK_MCLK,     SRC4XXX_RXCLK_MCLK);
 450         if (ret < 0)
 451                 dev_err(dev,
 452                         "Failed to enable mclk as the PLL1 DIR reference : %d\n", ret);
 453
 454         /* default to leaving the PLL2 running on loss of lock, divide by 8 */
 455         ret = regmap_update_bits(src4xxx->regmap, SRC4XXX_RCV_CTL_0E,
 456                 SRC4XXX_PLL2_DIV_8 | SRC4XXX_REC_MCLK_EN | SRC4XXX_PLL2_LOL,
 457                 SRC4XXX_PLL2_DIV_8 | SRC4XXX_REC_MCLK_EN | SRC4XXX_PLL2_LOL);
 458         if (ret < 0)
 459                 dev_err(dev, "Failed to enable mclk rec and div : %d\n", ret);
 460
 461         ret = devm_snd_soc_register_component(dev, &src4xxx_driver,
 462                         src4xxx_dai_driver, ARRAY_SIZE(src4xxx_dai_driver));
 463         if (ret == 0)
 464                 dev_info(dev, "src4392 probe ok %d\n", ret);
 465         return ret;
 466 }
 467 EXPORT_SYMBOL_GPL(src4xxx_probe);
 468
 469 static bool src4xxx_volatile_register(struct device *dev, unsigned int reg)
 470 {
 471         switch (reg) {
 472         case SRC4XXX_RES_00:
 473         case SRC4XXX_GLOBAL_ITR_STS_02:
 474         case SRC4XXX_SRC_DIT_STS_0A:
 475         case SRC4XXX_NON_AUDIO_D_12:
 476         case SRC4XXX_RVC_STS_13:
 477         case SRC4XXX_RVC_STS_14:
 478         case SRC4XXX_RVC_STS_15:
 479         case SRC4XXX_SUB_CODE_1F:
 480         case SRC4XXX_SUB_CODE_20:
 481         case SRC4XXX_SUB_CODE_21:
 482         case SRC4XXX_SUB_CODE_22:
 483         case SRC4XXX_SUB_CODE_23:
 484         case SRC4XXX_SUB_CODE_24:
 485         case SRC4XXX_SUB_CODE_25:
 486         case SRC4XXX_SUB_CODE_26:
 487         case SRC4XXX_SUB_CODE_27:
 488         case SRC4XXX_SUB_CODE_28:
 489         case SRC4XXX_PC_PREAMBLE_HI_29:
 490         case SRC4XXX_PC_PREAMBLE_LO_2A:
 491         case SRC4XXX_PD_PREAMBLE_HI_2B:
 492         case SRC4XXX_PC_PREAMBLE_LO_2C:
 493         case SRC4XXX_IO_RATIO_32:
 494         case SRC4XXX_IO_RATIO_33:
 495                 return true;
 496         }
 497
 498         if (reg > SRC4XXX_IO_RATIO_33 && reg < SRC4XXX_PAGE_SEL_7F)
 499                 return true;
 500
 501         return false;
 502 }
 503
 504 const struct regmap_config src4xxx_regmap_config = {
 505         .val_bits = 8,
 506         .reg_bits = 8,
 507         .max_register = SRC4XXX_IO_RATIO_33,
 508
 509         .reg_defaults = src4xxx_reg_defaults,
 510         .num_reg_defaults = ARRAY_SIZE(src4xxx_reg_defaults),
 511         .volatile_reg = src4xxx_volatile_register,
 512         .cache_type = REGCACHE_RBTREE,
 513 };
 514 EXPORT_SYMBOL_GPL(src4xxx_regmap_config);
 515
 516 MODULE_DESCRIPTION("ASoC SRC4XXX CODEC driver");
 517 MODULE_AUTHOR("Matt Flax <flatmax@flatmax.com>");
 518 MODULE_LICENSE("GPL");