sound/soc/codecs/rk3328_codec.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // rk3328 ALSA SoC Audio driver
   4 //
   5 // Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd All rights reserved.
   6
   7 #include <linux/clk.h>
   8 #include <linux/delay.h>
   9 #include <linux/device.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/regmap.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <sound/dmaengine_pcm.h>
  18 #include <sound/pcm_params.h>
  19 #include "rk3328_codec.h"
  20
  21 /*
  22  * volume setting
  23  * 0: -39dB
  24  * 26: 0dB
  25  * 31: 6dB
  26  * Step: 1.5dB
  27  */
  28 #define OUT_VOLUME      (0x18)
  29 #define RK3328_GRF_SOC_CON2     (0x0408)
  30 #define RK3328_GRF_SOC_CON10    (0x0428)
  31 #define INITIAL_FREQ    (11289600)
  32
  33 struct rk3328_codec_priv {
  34         struct regmap *regmap;
  35         struct gpio_desc *mute;
  36         struct clk *mclk;
  37         struct clk *pclk;
  38         unsigned int sclk;
  39         int spk_depop_time; /* msec */
  40 };
  41
  42 static const struct reg_default rk3328_codec_reg_defaults[] = {
  43         { CODEC_RESET, 0x03 },
  44         { DAC_INIT_CTRL1, 0x00 },
  45         { DAC_INIT_CTRL2, 0x50 },
  46         { DAC_INIT_CTRL3, 0x0e },
  47         { DAC_PRECHARGE_CTRL, 0x01 },
  48         { DAC_PWR_CTRL, 0x00 },
  49         { DAC_CLK_CTRL, 0x00 },
  50         { HPMIX_CTRL, 0x00 },
  51         { HPOUT_CTRL, 0x00 },
  52         { HPOUTL_GAIN_CTRL, 0x00 },
  53         { HPOUTR_GAIN_CTRL, 0x00 },
  54         { HPOUT_POP_CTRL, 0x11 },
  55 };
  56
  57 static int rk3328_codec_reset(struct rk3328_codec_priv *rk3328)
  58 {
  59         regmap_write(rk3328->regmap, CODEC_RESET, 0x00);
  60         mdelay(10);
  61         regmap_write(rk3328->regmap, CODEC_RESET, 0x03);
  62
  63         return 0;
  64 }
  65
  66 static int rk3328_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
  67 {
  68         struct rk3328_codec_priv *rk3328 =
  69                 snd_soc_component_get_drvdata(dai->component);
  70         unsigned int val;
  71
  72         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  73         case SND_SOC_DAIFMT_CBS_CFS:
  74                 val = PIN_DIRECTION_IN | DAC_I2S_MODE_SLAVE;
  75                 break;
  76         case SND_SOC_DAIFMT_CBM_CFM:
  77                 val = PIN_DIRECTION_OUT | DAC_I2S_MODE_MASTER;
  78                 break;
  79         default:
  80                 return -EINVAL;
  81         }
  82
  83         regmap_update_bits(rk3328->regmap, DAC_INIT_CTRL1,
  84                            PIN_DIRECTION_MASK | DAC_I2S_MODE_MASK, val);
  85
  86         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  87         case SND_SOC_DAIFMT_DSP_A:
  88         case SND_SOC_DAIFMT_DSP_B:
  89                 val = DAC_MODE_PCM;
  90                 break;
  91         case SND_SOC_DAIFMT_I2S:
  92                 val = DAC_MODE_I2S;
  93                 break;
  94         case SND_SOC_DAIFMT_RIGHT_J:
  95                 val = DAC_MODE_RJM;
  96                 break;
  97         case SND_SOC_DAIFMT_LEFT_J:
  98                 val = DAC_MODE_LJM;
  99                 break;
 100         default:
 101                 return -EINVAL;
 102         }
 103
 104         regmap_update_bits(rk3328->regmap, DAC_INIT_CTRL2,
 105                            DAC_MODE_MASK, val);
 106
 107         return 0;
 108 }
 109
 110 static int rk3328_mute_stream(struct snd_soc_dai *dai, int mute, int direction)
 111 {
 112         struct rk3328_codec_priv *rk3328 =
 113                 snd_soc_component_get_drvdata(dai->component);
 114         unsigned int val;
 115
 116         if (mute)
 117                 val = HPOUTL_MUTE | HPOUTR_MUTE;
 118         else
 119                 val = HPOUTL_UNMUTE | HPOUTR_UNMUTE;
 120
 121         regmap_update_bits(rk3328->regmap, HPOUT_CTRL,
 122                            HPOUTL_MUTE_MASK | HPOUTR_MUTE_MASK, val);
 123
 124         return 0;
 125 }
 126
 127 static int rk3328_codec_power_on(struct rk3328_codec_priv *rk3328, int wait_ms)
 128 {
 129         regmap_update_bits(rk3328->regmap, DAC_PRECHARGE_CTRL,
 130                            DAC_CHARGE_XCHARGE_MASK, DAC_CHARGE_PRECHARGE);
 131         mdelay(10);
 132         regmap_update_bits(rk3328->regmap, DAC_PRECHARGE_CTRL,
 133                            DAC_CHARGE_CURRENT_ALL_MASK,
 134                            DAC_CHARGE_CURRENT_ALL_ON);
 135         mdelay(wait_ms);
 136
 137         return 0;
 138 }
 139
 140 static int rk3328_codec_power_off(struct rk3328_codec_priv *rk3328, int wait_ms)
 141 {
 142         regmap_update_bits(rk3328->regmap, DAC_PRECHARGE_CTRL,
 143                            DAC_CHARGE_XCHARGE_MASK, DAC_CHARGE_DISCHARGE);
 144         mdelay(10);
 145         regmap_update_bits(rk3328->regmap, DAC_PRECHARGE_CTRL,
 146                            DAC_CHARGE_CURRENT_ALL_MASK,
 147                            DAC_CHARGE_CURRENT_ALL_ON);
 148         mdelay(wait_ms);
 149
 150         return 0;
 151 }
 152
 153 static const struct rk3328_reg_msk_val playback_open_list[] = {
 154         { DAC_PWR_CTRL, DAC_PWR_MASK, DAC_PWR_ON },
 155         { DAC_PWR_CTRL, DACL_PATH_REFV_MASK | DACR_PATH_REFV_MASK,
 156           DACL_PATH_REFV_ON | DACR_PATH_REFV_ON },
 157         { DAC_PWR_CTRL, HPOUTL_ZERO_CROSSING_MASK | HPOUTR_ZERO_CROSSING_MASK,
 158           HPOUTL_ZERO_CROSSING_ON | HPOUTR_ZERO_CROSSING_ON },
 159         { HPOUT_POP_CTRL, HPOUTR_POP_MASK | HPOUTL_POP_MASK,
 160           HPOUTR_POP_WORK | HPOUTL_POP_WORK },
 161         { HPMIX_CTRL, HPMIXL_MASK | HPMIXR_MASK, HPMIXL_EN | HPMIXR_EN },
 162         { HPMIX_CTRL, HPMIXL_INIT_MASK | HPMIXR_INIT_MASK,
 163           HPMIXL_INIT_EN | HPMIXR_INIT_EN },
 164         { HPOUT_CTRL, HPOUTL_MASK | HPOUTR_MASK, HPOUTL_EN | HPOUTR_EN },
 165         { HPOUT_CTRL, HPOUTL_INIT_MASK | HPOUTR_INIT_MASK,
 166           HPOUTL_INIT_EN | HPOUTR_INIT_EN },
 167         { DAC_CLK_CTRL, DACL_REFV_MASK | DACR_REFV_MASK,
 168           DACL_REFV_ON | DACR_REFV_ON },
 169         { DAC_CLK_CTRL, DACL_CLK_MASK | DACR_CLK_MASK,
 170           DACL_CLK_ON | DACR_CLK_ON },
 171         { DAC_CLK_CTRL, DACL_MASK | DACR_MASK, DACL_ON | DACR_ON },
 172         { DAC_CLK_CTRL, DACL_INIT_MASK | DACR_INIT_MASK,
 173           DACL_INIT_ON | DACR_INIT_ON },
 174         { DAC_SELECT, DACL_SELECT_MASK | DACR_SELECT_MASK,
 175           DACL_SELECT | DACR_SELECT },
 176         { HPMIX_CTRL, HPMIXL_INIT2_MASK | HPMIXR_INIT2_MASK,
 177           HPMIXL_INIT2_EN | HPMIXR_INIT2_EN },
 178         { HPOUT_CTRL, HPOUTL_MUTE_MASK | HPOUTR_MUTE_MASK,
 179           HPOUTL_UNMUTE | HPOUTR_UNMUTE },
 180 };
 181
 182 static int rk3328_codec_open_playback(struct rk3328_codec_priv *rk3328)
 183 {
 184         int i;
 185
 186         regmap_update_bits(rk3328->regmap, DAC_PRECHARGE_CTRL,
 187                            DAC_CHARGE_CURRENT_ALL_MASK,
 188                            DAC_CHARGE_CURRENT_I);
 189
 190         for (i = 0; i < ARRAY_SIZE(playback_open_list); i++) {
 191                 regmap_update_bits(rk3328->regmap,
 192                                    playback_open_list[i].reg,
 193                                    playback_open_list[i].msk,
 194                                    playback_open_list[i].val);
 195                 mdelay(1);
 196         }
 197
 198         msleep(rk3328->spk_depop_time);
 199         gpiod_set_value(rk3328->mute, 0);
 200
 201         regmap_update_bits(rk3328->regmap, HPOUTL_GAIN_CTRL,
 202                            HPOUTL_GAIN_MASK, OUT_VOLUME);
 203         regmap_update_bits(rk3328->regmap, HPOUTR_GAIN_CTRL,
 204                            HPOUTR_GAIN_MASK, OUT_VOLUME);
 205
 206         return 0;
 207 }
 208
 209 static const struct rk3328_reg_msk_val playback_close_list[] = {
 210         { HPMIX_CTRL, HPMIXL_INIT2_MASK | HPMIXR_INIT2_MASK,
 211           HPMIXL_INIT2_DIS | HPMIXR_INIT2_DIS },
 212         { DAC_SELECT, DACL_SELECT_MASK | DACR_SELECT_MASK,
 213           DACL_UNSELECT | DACR_UNSELECT },
 214         { HPOUT_CTRL, HPOUTL_MUTE_MASK | HPOUTR_MUTE_MASK,
 215           HPOUTL_MUTE | HPOUTR_MUTE },
 216         { HPOUT_CTRL, HPOUTL_INIT_MASK | HPOUTR_INIT_MASK,
 217           HPOUTL_INIT_DIS | HPOUTR_INIT_DIS },
 218         { HPOUT_CTRL, HPOUTL_MASK | HPOUTR_MASK, HPOUTL_DIS | HPOUTR_DIS },
 219         { HPMIX_CTRL, HPMIXL_MASK | HPMIXR_MASK, HPMIXL_DIS | HPMIXR_DIS },
 220         { DAC_CLK_CTRL, DACL_MASK | DACR_MASK, DACL_OFF | DACR_OFF },
 221         { DAC_CLK_CTRL, DACL_CLK_MASK | DACR_CLK_MASK,
 222           DACL_CLK_OFF | DACR_CLK_OFF },
 223         { DAC_CLK_CTRL, DACL_REFV_MASK | DACR_REFV_MASK,
 224           DACL_REFV_OFF | DACR_REFV_OFF },
 225         { HPOUT_POP_CTRL, HPOUTR_POP_MASK | HPOUTL_POP_MASK,
 226           HPOUTR_POP_XCHARGE | HPOUTL_POP_XCHARGE },
 227         { DAC_PWR_CTRL, DACL_PATH_REFV_MASK | DACR_PATH_REFV_MASK,
 228           DACL_PATH_REFV_OFF | DACR_PATH_REFV_OFF },
 229         { DAC_PWR_CTRL, DAC_PWR_MASK, DAC_PWR_OFF },
 230         { HPMIX_CTRL, HPMIXL_INIT_MASK | HPMIXR_INIT_MASK,
 231           HPMIXL_INIT_DIS | HPMIXR_INIT_DIS },
 232         { DAC_CLK_CTRL, DACL_INIT_MASK | DACR_INIT_MASK,
 233           DACL_INIT_OFF | DACR_INIT_OFF },
 234 };
 235
 236 static int rk3328_codec_close_playback(struct rk3328_codec_priv *rk3328)
 237 {
 238         size_t i;
 239
 240         gpiod_set_value(rk3328->mute, 1);
 241
 242         regmap_update_bits(rk3328->regmap, HPOUTL_GAIN_CTRL,
 243                            HPOUTL_GAIN_MASK, 0);
 244         regmap_update_bits(rk3328->regmap, HPOUTR_GAIN_CTRL,
 245                            HPOUTR_GAIN_MASK, 0);
 246
 247         for (i = 0; i < ARRAY_SIZE(playback_close_list); i++) {
 248                 regmap_update_bits(rk3328->regmap,
 249                                    playback_close_list[i].reg,
 250                                    playback_close_list[i].msk,
 251                                    playback_close_list[i].val);
 252                 mdelay(1);
 253         }
 254
 255         /* Workaround for silence when changed Fs 48 -> 44.1kHz */
 256         rk3328_codec_reset(rk3328);
 257
 258         regmap_update_bits(rk3328->regmap, DAC_PRECHARGE_CTRL,
 259                            DAC_CHARGE_CURRENT_ALL_MASK,
 260                            DAC_CHARGE_CURRENT_ALL_ON);
 261
 262         return 0;
 263 }
 264
 265 static int rk3328_hw_params(struct snd_pcm_substream *substream,
 266                             struct snd_pcm_hw_params *params,
 267                             struct snd_soc_dai *dai)
 268 {
 269         struct rk3328_codec_priv *rk3328 =
 270                 snd_soc_component_get_drvdata(dai->component);
 271         unsigned int val = 0;
 272
 273         switch (params_format(params)) {
 274         case SNDRV_PCM_FORMAT_S16_LE:
 275                 val = DAC_VDL_16BITS;
 276                 break;
 277         case SNDRV_PCM_FORMAT_S20_3LE:
 278                 val = DAC_VDL_20BITS;
 279                 break;
 280         case SNDRV_PCM_FORMAT_S24_LE:
 281                 val = DAC_VDL_24BITS;
 282                 break;
 283         case SNDRV_PCM_FORMAT_S32_LE:
 284                 val = DAC_VDL_32BITS;
 285                 break;
 286         default:
 287                 return -EINVAL;
 288         }
 289         regmap_update_bits(rk3328->regmap, DAC_INIT_CTRL2, DAC_VDL_MASK, val);
 290
 291         val = DAC_WL_32BITS | DAC_RST_DIS;
 292         regmap_update_bits(rk3328->regmap, DAC_INIT_CTRL3,
 293                            DAC_WL_MASK | DAC_RST_MASK, val);
 294
 295         return 0;
 296 }
 297
 298 static int rk3328_pcm_startup(struct snd_pcm_substream *substream,
 299                               struct snd_soc_dai *dai)
 300 {
 301         struct rk3328_codec_priv *rk3328 =
 302                 snd_soc_component_get_drvdata(dai->component);
 303
 304         return rk3328_codec_open_playback(rk3328);
 305 }
 306
 307 static void rk3328_pcm_shutdown(struct snd_pcm_substream *substream,
 308                                 struct snd_soc_dai *dai)
 309 {
 310         struct rk3328_codec_priv *rk3328 =
 311                 snd_soc_component_get_drvdata(dai->component);
 312
 313         rk3328_codec_close_playback(rk3328);
 314 }
 315
 316 static const struct snd_soc_dai_ops rk3328_dai_ops = {
 317         .hw_params = rk3328_hw_params,
 318         .set_fmt = rk3328_set_dai_fmt,
 319         .mute_stream = rk3328_mute_stream,
 320         .startup = rk3328_pcm_startup,
 321         .shutdown = rk3328_pcm_shutdown,
 322         .no_capture_mute = 1,
 323 };
 324
 325 static struct snd_soc_dai_driver rk3328_dai[] = {
 326         {
 327                 .name = "rk3328-hifi",
 328                 .id = RK3328_HIFI,
 329                 .playback = {
 330                         .stream_name = "HIFI Playback",
 331                         .channels_min = 1,
 332                         .channels_max = 2,
 333                         .rates = SNDRV_PCM_RATE_8000_96000,
 334                         .formats = (SNDRV_PCM_FMTBIT_S16_LE |
 335                                     SNDRV_PCM_FMTBIT_S20_3LE |
 336                                     SNDRV_PCM_FMTBIT_S24_LE |
 337                                     SNDRV_PCM_FMTBIT_S32_LE),
 338                 },
 339                 .capture = {
 340                         .stream_name = "HIFI Capture",
 341                         .channels_min = 2,
 342                         .channels_max = 8,
 343                         .rates = SNDRV_PCM_RATE_8000_96000,
 344                         .formats = (SNDRV_PCM_FMTBIT_S16_LE |
 345                                     SNDRV_PCM_FMTBIT_S20_3LE |
 346                                     SNDRV_PCM_FMTBIT_S24_LE |
 347                                     SNDRV_PCM_FMTBIT_S32_LE),
 348                 },
 349                 .ops = &rk3328_dai_ops,
 350         },
 351 };
 352
 353 static int rk3328_codec_probe(struct snd_soc_component *component)
 354 {
 355         struct rk3328_codec_priv *rk3328 =
 356                 snd_soc_component_get_drvdata(component);
 357
 358         rk3328_codec_reset(rk3328);
 359         rk3328_codec_power_on(rk3328, 0);
 360
 361         return 0;
 362 }
 363
 364 static void rk3328_codec_remove(struct snd_soc_component *component)
 365 {
 366         struct rk3328_codec_priv *rk3328 =
 367                 snd_soc_component_get_drvdata(component);
 368
 369         rk3328_codec_close_playback(rk3328);
 370         rk3328_codec_power_off(rk3328, 0);
 371 }
 372
 373 static const struct snd_soc_component_driver soc_codec_rk3328 = {
 374         .probe = rk3328_codec_probe,
 375         .remove = rk3328_codec_remove,
 376 };
 377
 378 static bool rk3328_codec_write_read_reg(struct device *dev, unsigned int reg)
 379 {
 380         switch (reg) {
 381         case CODEC_RESET:
 382         case DAC_INIT_CTRL1:
 383         case DAC_INIT_CTRL2:
 384         case DAC_INIT_CTRL3:
 385         case DAC_PRECHARGE_CTRL:
 386         case DAC_PWR_CTRL:
 387         case DAC_CLK_CTRL:
 388         case HPMIX_CTRL:
 389         case DAC_SELECT:
 390         case HPOUT_CTRL:
 391         case HPOUTL_GAIN_CTRL:
 392         case HPOUTR_GAIN_CTRL:
 393         case HPOUT_POP_CTRL:
 394                 return true;
 395         default:
 396                 return false;
 397         }
 398 }
 399
 400 static bool rk3328_codec_volatile_reg(struct device *dev, unsigned int reg)
 401 {
 402         switch (reg) {
 403         case CODEC_RESET:
 404                 return true;
 405         default:
 406                 return false;
 407         }
 408 }
 409
 410 static const struct regmap_config rk3328_codec_regmap_config = {
 411         .reg_bits = 32,
 412         .reg_stride = 4,
 413         .val_bits = 32,
 414         .max_register = HPOUT_POP_CTRL,
 415         .writeable_reg = rk3328_codec_write_read_reg,
 416         .readable_reg = rk3328_codec_write_read_reg,
 417         .volatile_reg = rk3328_codec_volatile_reg,
 418         .reg_defaults = rk3328_codec_reg_defaults,
 419         .num_reg_defaults = ARRAY_SIZE(rk3328_codec_reg_defaults),
 420         .cache_type = REGCACHE_FLAT,
 421 };
 422
 423 static int rk3328_platform_probe(struct platform_device *pdev)
 424 {
 425         struct device_node *rk3328_np = pdev->dev.of_node;
 426         struct rk3328_codec_priv *rk3328;
 427         struct regmap *grf;
 428         void __iomem *base;
 429         int ret = 0;
 430
 431         rk3328 = devm_kzalloc(&pdev->dev, sizeof(*rk3328), GFP_KERNEL);
 432         if (!rk3328)
 433                 return -ENOMEM;
 434
 435         grf = syscon_regmap_lookup_by_phandle(rk3328_np,
 436                                               "rockchip,grf");
 437         if (IS_ERR(grf)) {
 438                 dev_err(&pdev->dev, "missing 'rockchip,grf'\n");
 439                 return PTR_ERR(grf);
 440         }
 441         /* enable i2s_acodec_en */
 442         regmap_write(grf, RK3328_GRF_SOC_CON2,
 443                      (BIT(14) << 16 | BIT(14)));
 444
 445         ret = of_property_read_u32(rk3328_np, "spk-depop-time-ms",
 446                                    &rk3328->spk_depop_time);
 447         if (ret < 0) {
 448                 dev_info(&pdev->dev, "spk_depop_time use default value.\n");
 449                 rk3328->spk_depop_time = 200;
 450         }
 451
 452         rk3328->mute = gpiod_get_optional(&pdev->dev, "mute", GPIOD_OUT_HIGH);
 453         if (IS_ERR(rk3328->mute))
 454                 return PTR_ERR(rk3328->mute);
 455         /*
 456          * Rock64 is the only supported platform to have widely relied on
 457          * this; if we do happen to come across an old DTB, just leave the
 458          * external mute forced off.
 459          */
 460         if (!rk3328->mute && of_machine_is_compatible("pine64,rock64")) {
 461                 dev_warn(&pdev->dev, "assuming implicit control of GPIO_MUTE; update devicetree if possible\n");
 462                 regmap_write(grf, RK3328_GRF_SOC_CON10, BIT(17) | BIT(1));
 463         }
 464
 465         rk3328->mclk = devm_clk_get(&pdev->dev, "mclk");
 466         if (IS_ERR(rk3328->mclk))
 467                 return PTR_ERR(rk3328->mclk);
 468
 469         ret = clk_prepare_enable(rk3328->mclk);
 470         if (ret)
 471                 return ret;
 472         clk_set_rate(rk3328->mclk, INITIAL_FREQ);
 473
 474         rk3328->pclk = devm_clk_get(&pdev->dev, "pclk");
 475         if (IS_ERR(rk3328->pclk)) {
 476                 dev_err(&pdev->dev, "can't get acodec pclk\n");
 477                 ret = PTR_ERR(rk3328->pclk);
 478                 goto err_unprepare_mclk;
 479         }
 480
 481         ret = clk_prepare_enable(rk3328->pclk);
 482         if (ret < 0) {
 483                 dev_err(&pdev->dev, "failed to enable acodec pclk\n");
 484                 goto err_unprepare_mclk;
 485         }
 486
 487         base = devm_platform_ioremap_resource(pdev, 0);
 488         if (IS_ERR(base)) {
 489                 ret = PTR_ERR(base);
 490                 goto err_unprepare_pclk;
 491         }
 492
 493         rk3328->regmap = devm_regmap_init_mmio(&pdev->dev, base,
 494                                                &rk3328_codec_regmap_config);
 495         if (IS_ERR(rk3328->regmap)) {
 496                 ret = PTR_ERR(rk3328->regmap);
 497                 goto err_unprepare_pclk;
 498         }
 499
 500         platform_set_drvdata(pdev, rk3328);
 501
 502         ret = devm_snd_soc_register_component(&pdev->dev, &soc_codec_rk3328,
 503                                                rk3328_dai,
 504                                                ARRAY_SIZE(rk3328_dai));
 505         if (ret)
 506                 goto err_unprepare_pclk;
 507
 508         return 0;
 509
 510 err_unprepare_pclk:
 511         clk_disable_unprepare(rk3328->pclk);
 512
 513 err_unprepare_mclk:
 514         clk_disable_unprepare(rk3328->mclk);
 515         return ret;
 516 }
 517
 518 static const struct of_device_id rk3328_codec_of_match[] __maybe_unused = {
 519                 { .compatible = "rockchip,rk3328-codec", },
 520                 {},
 521 };
 522 MODULE_DEVICE_TABLE(of, rk3328_codec_of_match);
 523
 524 static struct platform_driver rk3328_codec_driver = {
 525         .driver = {
 526                    .name = "rk3328-codec",
 527                    .of_match_table = of_match_ptr(rk3328_codec_of_match),
 528         },
 529         .probe = rk3328_platform_probe,
 530 };
 531 module_platform_driver(rk3328_codec_driver);
 532
 533 MODULE_AUTHOR("Sugar Zhang <sugar.zhang@rock-chips.com>");
 534 MODULE_DESCRIPTION("ASoC rk3328 codec driver");
 535 MODULE_LICENSE("GPL v2");