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