sound/soc/codecs/pcm512x.c

   1 /*
   2  * Driver for the PCM512x CODECs
   3  *
   4  * Author:      Mark Brown <broonie@linaro.org>
   5  *              Copyright 2014 Linaro Ltd
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  */
  16
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/clk.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/regmap.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <sound/soc.h>
  25 #include <sound/soc-dapm.h>
  26 #include <sound/tlv.h>
  27
  28 #include "pcm512x.h"
  29
  30 #define PCM512x_NUM_SUPPLIES 3
  31 static const char * const pcm512x_supply_names[PCM512x_NUM_SUPPLIES] = {
  32         "AVDD",
  33         "DVDD",
  34         "CPVDD",
  35 };
  36
  37 struct pcm512x_priv {
  38         struct regmap *regmap;
  39         struct clk *sclk;
  40         struct regulator_bulk_data supplies[PCM512x_NUM_SUPPLIES];
  41         struct notifier_block supply_nb[PCM512x_NUM_SUPPLIES];
  42 };
  43
  44 /*
  45  * We can't use the same notifier block for more than one supply and
  46  * there's no way I can see to get from a callback to the caller
  47  * except container_of().
  48  */
  49 #define PCM512x_REGULATOR_EVENT(n) \
  50 static int pcm512x_regulator_event_##n(struct notifier_block *nb, \
  51                                       unsigned long event, void *data)    \
  52 { \
  53         struct pcm512x_priv *pcm512x = container_of(nb, struct pcm512x_priv, \
  54                                                     supply_nb[n]); \
  55         if (event & REGULATOR_EVENT_DISABLE) { \
  56                 regcache_mark_dirty(pcm512x->regmap);   \
  57                 regcache_cache_only(pcm512x->regmap, true);     \
  58         } \
  59         return 0; \
  60 }
  61
  62 PCM512x_REGULATOR_EVENT(0)
  63 PCM512x_REGULATOR_EVENT(1)
  64 PCM512x_REGULATOR_EVENT(2)
  65
  66 static const struct reg_default pcm512x_reg_defaults[] = {
  67         { PCM512x_RESET,             0x00 },
  68         { PCM512x_POWER,             0x00 },
  69         { PCM512x_MUTE,              0x00 },
  70         { PCM512x_DSP,               0x00 },
  71         { PCM512x_PLL_REF,           0x00 },
  72         { PCM512x_DAC_ROUTING,       0x11 },
  73         { PCM512x_DSP_PROGRAM,       0x01 },
  74         { PCM512x_CLKDET,            0x00 },
  75         { PCM512x_AUTO_MUTE,         0x00 },
  76         { PCM512x_ERROR_DETECT,      0x00 },
  77         { PCM512x_DIGITAL_VOLUME_1,  0x00 },
  78         { PCM512x_DIGITAL_VOLUME_2,  0x30 },
  79         { PCM512x_DIGITAL_VOLUME_3,  0x30 },
  80         { PCM512x_DIGITAL_MUTE_1,    0x22 },
  81         { PCM512x_DIGITAL_MUTE_2,    0x00 },
  82         { PCM512x_DIGITAL_MUTE_3,    0x07 },
  83         { PCM512x_OUTPUT_AMPLITUDE,  0x00 },
  84         { PCM512x_ANALOG_GAIN_CTRL,  0x00 },
  85         { PCM512x_UNDERVOLTAGE_PROT, 0x00 },
  86         { PCM512x_ANALOG_MUTE_CTRL,  0x00 },
  87         { PCM512x_ANALOG_GAIN_BOOST, 0x00 },
  88         { PCM512x_VCOM_CTRL_1,       0x00 },
  89         { PCM512x_VCOM_CTRL_2,       0x01 },
  90 };
  91
  92 static bool pcm512x_readable(struct device *dev, unsigned int reg)
  93 {
  94         switch (reg) {
  95         case PCM512x_RESET:
  96         case PCM512x_POWER:
  97         case PCM512x_MUTE:
  98         case PCM512x_PLL_EN:
  99         case PCM512x_SPI_MISO_FUNCTION:
 100         case PCM512x_DSP:
 101         case PCM512x_GPIO_EN:
 102         case PCM512x_BCLK_LRCLK_CFG:
 103         case PCM512x_DSP_GPIO_INPUT:
 104         case PCM512x_MASTER_MODE:
 105         case PCM512x_PLL_REF:
 106         case PCM512x_PLL_COEFF_0:
 107         case PCM512x_PLL_COEFF_1:
 108         case PCM512x_PLL_COEFF_2:
 109         case PCM512x_PLL_COEFF_3:
 110         case PCM512x_PLL_COEFF_4:
 111         case PCM512x_DSP_CLKDIV:
 112         case PCM512x_DAC_CLKDIV:
 113         case PCM512x_NCP_CLKDIV:
 114         case PCM512x_OSR_CLKDIV:
 115         case PCM512x_MASTER_CLKDIV_1:
 116         case PCM512x_MASTER_CLKDIV_2:
 117         case PCM512x_FS_SPEED_MODE:
 118         case PCM512x_IDAC_1:
 119         case PCM512x_IDAC_2:
 120         case PCM512x_ERROR_DETECT:
 121         case PCM512x_I2S_1:
 122         case PCM512x_I2S_2:
 123         case PCM512x_DAC_ROUTING:
 124         case PCM512x_DSP_PROGRAM:
 125         case PCM512x_CLKDET:
 126         case PCM512x_AUTO_MUTE:
 127         case PCM512x_DIGITAL_VOLUME_1:
 128         case PCM512x_DIGITAL_VOLUME_2:
 129         case PCM512x_DIGITAL_VOLUME_3:
 130         case PCM512x_DIGITAL_MUTE_1:
 131         case PCM512x_DIGITAL_MUTE_2:
 132         case PCM512x_DIGITAL_MUTE_3:
 133         case PCM512x_GPIO_OUTPUT_1:
 134         case PCM512x_GPIO_OUTPUT_2:
 135         case PCM512x_GPIO_OUTPUT_3:
 136         case PCM512x_GPIO_OUTPUT_4:
 137         case PCM512x_GPIO_OUTPUT_5:
 138         case PCM512x_GPIO_OUTPUT_6:
 139         case PCM512x_GPIO_CONTROL_1:
 140         case PCM512x_GPIO_CONTROL_2:
 141         case PCM512x_OVERFLOW:
 142         case PCM512x_RATE_DET_1:
 143         case PCM512x_RATE_DET_2:
 144         case PCM512x_RATE_DET_3:
 145         case PCM512x_RATE_DET_4:
 146         case PCM512x_ANALOG_MUTE_DET:
 147         case PCM512x_GPIN:
 148         case PCM512x_DIGITAL_MUTE_DET:
 149         case PCM512x_OUTPUT_AMPLITUDE:
 150         case PCM512x_ANALOG_GAIN_CTRL:
 151         case PCM512x_UNDERVOLTAGE_PROT:
 152         case PCM512x_ANALOG_MUTE_CTRL:
 153         case PCM512x_ANALOG_GAIN_BOOST:
 154         case PCM512x_VCOM_CTRL_1:
 155         case PCM512x_VCOM_CTRL_2:
 156         case PCM512x_CRAM_CTRL:
 157                 return true;
 158         default:
 159                 /* There are 256 raw register addresses */
 160                 return reg < 0xff;
 161         }
 162 }
 163
 164 static bool pcm512x_volatile(struct device *dev, unsigned int reg)
 165 {
 166         switch (reg) {
 167         case PCM512x_PLL_EN:
 168         case PCM512x_OVERFLOW:
 169         case PCM512x_RATE_DET_1:
 170         case PCM512x_RATE_DET_2:
 171         case PCM512x_RATE_DET_3:
 172         case PCM512x_RATE_DET_4:
 173         case PCM512x_ANALOG_MUTE_DET:
 174         case PCM512x_GPIN:
 175         case PCM512x_DIGITAL_MUTE_DET:
 176         case PCM512x_CRAM_CTRL:
 177                 return true;
 178         default:
 179                 /* There are 256 raw register addresses */
 180                 return reg < 0xff;
 181         }
 182 }
 183
 184 static const DECLARE_TLV_DB_SCALE(digital_tlv, -10350, 50, 1);
 185 static const DECLARE_TLV_DB_SCALE(analog_tlv, -600, 600, 0);
 186 static const DECLARE_TLV_DB_SCALE(boost_tlv, 0, 80, 0);
 187
 188 static const char * const pcm512x_dsp_program_texts[] = {
 189         "FIR interpolation with de-emphasis",
 190         "Low latency IIR with de-emphasis",
 191         "Fixed process flow",
 192         "High attenuation with de-emphasis",
 193         "Ringing-less low latency FIR",
 194 };
 195
 196 static const unsigned int pcm512x_dsp_program_values[] = {
 197         1,
 198         2,
 199         3,
 200         5,
 201         7,
 202 };
 203
 204 static SOC_VALUE_ENUM_SINGLE_DECL(pcm512x_dsp_program,
 205                                   PCM512x_DSP_PROGRAM, 0, 0x1f,
 206                                   pcm512x_dsp_program_texts,
 207                                   pcm512x_dsp_program_values);
 208
 209 static const char * const pcm512x_clk_missing_text[] = {
 210         "1s", "2s", "3s", "4s", "5s", "6s", "7s", "8s"
 211 };
 212
 213 static const struct soc_enum pcm512x_clk_missing =
 214         SOC_ENUM_SINGLE(PCM512x_CLKDET, 0,  8, pcm512x_clk_missing_text);
 215
 216 static const char * const pcm512x_autom_text[] = {
 217         "21ms", "106ms", "213ms", "533ms", "1.07s", "2.13s", "5.33s", "10.66s"
 218 };
 219
 220 static const struct soc_enum pcm512x_autom_l =
 221         SOC_ENUM_SINGLE(PCM512x_AUTO_MUTE, PCM512x_ATML_SHIFT, 8,
 222                         pcm512x_autom_text);
 223
 224 static const struct soc_enum pcm512x_autom_r =
 225         SOC_ENUM_SINGLE(PCM512x_AUTO_MUTE, PCM512x_ATMR_SHIFT, 8,
 226                         pcm512x_autom_text);
 227
 228 static const char * const pcm512x_ramp_rate_text[] = {
 229         "1 sample/update", "2 samples/update", "4 samples/update",
 230         "Immediate"
 231 };
 232
 233 static const struct soc_enum pcm512x_vndf =
 234         SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_1, PCM512x_VNDF_SHIFT, 4,
 235                         pcm512x_ramp_rate_text);
 236
 237 static const struct soc_enum pcm512x_vnuf =
 238         SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_1, PCM512x_VNUF_SHIFT, 4,
 239                         pcm512x_ramp_rate_text);
 240
 241 static const struct soc_enum pcm512x_vedf =
 242         SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_2, PCM512x_VEDF_SHIFT, 4,
 243                         pcm512x_ramp_rate_text);
 244
 245 static const char * const pcm512x_ramp_step_text[] = {
 246         "4dB/step", "2dB/step", "1dB/step", "0.5dB/step"
 247 };
 248
 249 static const struct soc_enum pcm512x_vnds =
 250         SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_1, PCM512x_VNDS_SHIFT, 4,
 251                         pcm512x_ramp_step_text);
 252
 253 static const struct soc_enum pcm512x_vnus =
 254         SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_1, PCM512x_VNUS_SHIFT, 4,
 255                         pcm512x_ramp_step_text);
 256
 257 static const struct soc_enum pcm512x_veds =
 258         SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_2, PCM512x_VEDS_SHIFT, 4,
 259                         pcm512x_ramp_step_text);
 260
 261 static const struct snd_kcontrol_new pcm512x_controls[] = {
 262 SOC_DOUBLE_R_TLV("Playback Digital Volume", PCM512x_DIGITAL_VOLUME_2,
 263                  PCM512x_DIGITAL_VOLUME_3, 0, 255, 1, digital_tlv),
 264 SOC_DOUBLE_TLV("Playback Volume", PCM512x_ANALOG_GAIN_CTRL,
 265                PCM512x_LAGN_SHIFT, PCM512x_RAGN_SHIFT, 1, 1, analog_tlv),
 266 SOC_DOUBLE_TLV("Playback Boost Volume", PCM512x_ANALOG_GAIN_BOOST,
 267                PCM512x_AGBL_SHIFT, PCM512x_AGBR_SHIFT, 1, 0, boost_tlv),
 268 SOC_DOUBLE("Playback Digital Switch", PCM512x_MUTE, PCM512x_RQML_SHIFT,
 269            PCM512x_RQMR_SHIFT, 1, 1),
 270
 271 SOC_SINGLE("Deemphasis Switch", PCM512x_DSP, PCM512x_DEMP_SHIFT, 1, 1),
 272 SOC_VALUE_ENUM("DSP Program", pcm512x_dsp_program),
 273
 274 SOC_ENUM("Clock Missing Period", pcm512x_clk_missing),
 275 SOC_ENUM("Auto Mute Time Left", pcm512x_autom_l),
 276 SOC_ENUM("Auto Mute Time Right", pcm512x_autom_r),
 277 SOC_SINGLE("Auto Mute Mono Switch", PCM512x_DIGITAL_MUTE_3,
 278            PCM512x_ACTL_SHIFT, 1, 0),
 279 SOC_DOUBLE("Auto Mute Switch", PCM512x_DIGITAL_MUTE_3, PCM512x_AMLE_SHIFT,
 280            PCM512x_AMLR_SHIFT, 1, 0),
 281
 282 SOC_ENUM("Volume Ramp Down Rate", pcm512x_vndf),
 283 SOC_ENUM("Volume Ramp Down Step", pcm512x_vnds),
 284 SOC_ENUM("Volume Ramp Up Rate", pcm512x_vnuf),
 285 SOC_ENUM("Volume Ramp Up Step", pcm512x_vnus),
 286 SOC_ENUM("Volume Ramp Down Emergency Rate", pcm512x_vedf),
 287 SOC_ENUM("Volume Ramp Down Emergency Step", pcm512x_veds),
 288 };
 289
 290 static const struct snd_soc_dapm_widget pcm512x_dapm_widgets[] = {
 291 SND_SOC_DAPM_DAC("DACL", NULL, SND_SOC_NOPM, 0, 0),
 292 SND_SOC_DAPM_DAC("DACR", NULL, SND_SOC_NOPM, 0, 0),
 293
 294 SND_SOC_DAPM_OUTPUT("OUTL"),
 295 SND_SOC_DAPM_OUTPUT("OUTR"),
 296 };
 297
 298 static const struct snd_soc_dapm_route pcm512x_dapm_routes[] = {
 299         { "DACL", NULL, "Playback" },
 300         { "DACR", NULL, "Playback" },
 301
 302         { "OUTL", NULL, "DACL" },
 303         { "OUTR", NULL, "DACR" },
 304 };
 305
 306 static int pcm512x_set_bias_level(struct snd_soc_codec *codec,
 307                                   enum snd_soc_bias_level level)
 308 {
 309         struct pcm512x_priv *pcm512x = dev_get_drvdata(codec->dev);
 310         int ret;
 311
 312         switch (level) {
 313         case SND_SOC_BIAS_ON:
 314         case SND_SOC_BIAS_PREPARE:
 315                 break;
 316
 317         case SND_SOC_BIAS_STANDBY:
 318                 ret = regmap_update_bits(pcm512x->regmap, PCM512x_POWER,
 319                                          PCM512x_RQST, 0);
 320                 if (ret != 0) {
 321                         dev_err(codec->dev, "Failed to remove standby: %d\n",
 322                                 ret);
 323                         return ret;
 324                 }
 325                 break;
 326
 327         case SND_SOC_BIAS_OFF:
 328                 ret = regmap_update_bits(pcm512x->regmap, PCM512x_POWER,
 329                                          PCM512x_RQST, PCM512x_RQST);
 330                 if (ret != 0) {
 331                         dev_err(codec->dev, "Failed to request standby: %d\n",
 332                                 ret);
 333                         return ret;
 334                 }
 335                 break;
 336         }
 337
 338         codec->dapm.bias_level = level;
 339
 340         return 0;
 341 }
 342
 343 static struct snd_soc_dai_driver pcm512x_dai = {
 344         .name = "pcm512x-hifi",
 345         .playback = {
 346                 .stream_name = "Playback",
 347                 .channels_min = 2,
 348                 .channels_max = 2,
 349                 .rates = SNDRV_PCM_RATE_8000_192000,
 350                 .formats = SNDRV_PCM_FMTBIT_S16_LE |
 351                            SNDRV_PCM_FMTBIT_S24_LE |
 352                            SNDRV_PCM_FMTBIT_S32_LE
 353         },
 354 };
 355
 356 static struct snd_soc_codec_driver pcm512x_codec_driver = {
 357         .set_bias_level = pcm512x_set_bias_level,
 358         .idle_bias_off = true,
 359
 360         .controls = pcm512x_controls,
 361         .num_controls = ARRAY_SIZE(pcm512x_controls),
 362         .dapm_widgets = pcm512x_dapm_widgets,
 363         .num_dapm_widgets = ARRAY_SIZE(pcm512x_dapm_widgets),
 364         .dapm_routes = pcm512x_dapm_routes,
 365         .num_dapm_routes = ARRAY_SIZE(pcm512x_dapm_routes),
 366 };
 367
 368 static const struct regmap_range_cfg pcm512x_range = {
 369         .name = "Pages", .range_min = PCM512x_VIRT_BASE,
 370         .range_max = PCM512x_MAX_REGISTER,
 371         .selector_reg = PCM512x_PAGE,
 372         .selector_mask = 0xff,
 373         .window_start = 0, .window_len = 0x100,
 374 };
 375
 376 const struct regmap_config pcm512x_regmap = {
 377         .reg_bits = 8,
 378         .val_bits = 8,
 379
 380         .readable_reg = pcm512x_readable,
 381         .volatile_reg = pcm512x_volatile,
 382
 383         .ranges = &pcm512x_range,
 384         .num_ranges = 1,
 385
 386         .max_register = PCM512x_MAX_REGISTER,
 387         .reg_defaults = pcm512x_reg_defaults,
 388         .num_reg_defaults = ARRAY_SIZE(pcm512x_reg_defaults),
 389         .cache_type = REGCACHE_RBTREE,
 390 };
 391 EXPORT_SYMBOL_GPL(pcm512x_regmap);
 392
 393 int pcm512x_probe(struct device *dev, struct regmap *regmap)
 394 {
 395         struct pcm512x_priv *pcm512x;
 396         int i, ret;
 397
 398         pcm512x = devm_kzalloc(dev, sizeof(struct pcm512x_priv), GFP_KERNEL);
 399         if (!pcm512x)
 400                 return -ENOMEM;
 401
 402         dev_set_drvdata(dev, pcm512x);
 403         pcm512x->regmap = regmap;
 404
 405         for (i = 0; i < ARRAY_SIZE(pcm512x->supplies); i++)
 406                 pcm512x->supplies[i].supply = pcm512x_supply_names[i];
 407
 408         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pcm512x->supplies),
 409                                       pcm512x->supplies);
 410         if (ret != 0) {
 411                 dev_err(dev, "Failed to get supplies: %d\n", ret);
 412                 return ret;
 413         }
 414
 415         pcm512x->supply_nb[0].notifier_call = pcm512x_regulator_event_0;
 416         pcm512x->supply_nb[1].notifier_call = pcm512x_regulator_event_1;
 417         pcm512x->supply_nb[2].notifier_call = pcm512x_regulator_event_2;
 418
 419         for (i = 0; i < ARRAY_SIZE(pcm512x->supplies); i++) {
 420                 ret = regulator_register_notifier(pcm512x->supplies[i].consumer,
 421                                                   &pcm512x->supply_nb[i]);
 422                 if (ret != 0) {
 423                         dev_err(dev,
 424                                 "Failed to register regulator notifier: %d\n",
 425                                 ret);
 426                 }
 427         }
 428
 429         ret = regulator_bulk_enable(ARRAY_SIZE(pcm512x->supplies),
 430                                     pcm512x->supplies);
 431         if (ret != 0) {
 432                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 433                 return ret;
 434         }
 435
 436         /* Reset the device, verifying I/O in the process for I2C */
 437         ret = regmap_write(regmap, PCM512x_RESET,
 438                            PCM512x_RSTM | PCM512x_RSTR);
 439         if (ret != 0) {
 440                 dev_err(dev, "Failed to reset device: %d\n", ret);
 441                 goto err;
 442         }
 443
 444         ret = regmap_write(regmap, PCM512x_RESET, 0);
 445         if (ret != 0) {
 446                 dev_err(dev, "Failed to reset device: %d\n", ret);
 447                 goto err;
 448         }
 449
 450         pcm512x->sclk = devm_clk_get(dev, NULL);
 451         if (IS_ERR(pcm512x->sclk)) {
 452                 if (PTR_ERR(pcm512x->sclk) == -EPROBE_DEFER)
 453                         return -EPROBE_DEFER;
 454
 455                 dev_info(dev, "No SCLK, using BCLK: %ld\n",
 456                          PTR_ERR(pcm512x->sclk));
 457
 458                 /* Disable reporting of missing SCLK as an error */
 459                 regmap_update_bits(regmap, PCM512x_ERROR_DETECT,
 460                                    PCM512x_IDCH, PCM512x_IDCH);
 461
 462                 /* Switch PLL input to BCLK */
 463                 regmap_update_bits(regmap, PCM512x_PLL_REF,
 464                                    PCM512x_SREF, PCM512x_SREF);
 465         } else {
 466                 ret = clk_prepare_enable(pcm512x->sclk);
 467                 if (ret != 0) {
 468                         dev_err(dev, "Failed to enable SCLK: %d\n", ret);
 469                         return ret;
 470                 }
 471         }
 472
 473         /* Default to standby mode */
 474         ret = regmap_update_bits(pcm512x->regmap, PCM512x_POWER,
 475                                  PCM512x_RQST, PCM512x_RQST);
 476         if (ret != 0) {
 477                 dev_err(dev, "Failed to request standby: %d\n",
 478                         ret);
 479                 goto err_clk;
 480         }
 481
 482         pm_runtime_set_active(dev);
 483         pm_runtime_enable(dev);
 484         pm_runtime_idle(dev);
 485
 486         ret = snd_soc_register_codec(dev, &pcm512x_codec_driver,
 487                                     &pcm512x_dai, 1);
 488         if (ret != 0) {
 489                 dev_err(dev, "Failed to register CODEC: %d\n", ret);
 490                 goto err_pm;
 491         }
 492
 493         return 0;
 494
 495 err_pm:
 496         pm_runtime_disable(dev);
 497 err_clk:
 498         if (!IS_ERR(pcm512x->sclk))
 499                 clk_disable_unprepare(pcm512x->sclk);
 500 err:
 501         regulator_bulk_disable(ARRAY_SIZE(pcm512x->supplies),
 502                                      pcm512x->supplies);
 503         return ret;
 504 }
 505 EXPORT_SYMBOL_GPL(pcm512x_probe);
 506
 507 void pcm512x_remove(struct device *dev)
 508 {
 509         struct pcm512x_priv *pcm512x = dev_get_drvdata(dev);
 510
 511         snd_soc_unregister_codec(dev);
 512         pm_runtime_disable(dev);
 513         if (!IS_ERR(pcm512x->sclk))
 514                 clk_disable_unprepare(pcm512x->sclk);
 515         regulator_bulk_disable(ARRAY_SIZE(pcm512x->supplies),
 516                                pcm512x->supplies);
 517 }
 518 EXPORT_SYMBOL_GPL(pcm512x_remove);
 519
 520 static int pcm512x_suspend(struct device *dev)
 521 {
 522         struct pcm512x_priv *pcm512x = dev_get_drvdata(dev);
 523         int ret;
 524
 525         ret = regmap_update_bits(pcm512x->regmap, PCM512x_POWER,
 526                                  PCM512x_RQPD, PCM512x_RQPD);
 527         if (ret != 0) {
 528                 dev_err(dev, "Failed to request power down: %d\n", ret);
 529                 return ret;
 530         }
 531
 532         ret = regulator_bulk_disable(ARRAY_SIZE(pcm512x->supplies),
 533                                      pcm512x->supplies);
 534         if (ret != 0) {
 535                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 536                 return ret;
 537         }
 538
 539         if (!IS_ERR(pcm512x->sclk))
 540                 clk_disable_unprepare(pcm512x->sclk);
 541
 542         return 0;
 543 }
 544
 545 static int pcm512x_resume(struct device *dev)
 546 {
 547         struct pcm512x_priv *pcm512x = dev_get_drvdata(dev);
 548         int ret;
 549
 550         if (!IS_ERR(pcm512x->sclk)) {
 551                 ret = clk_prepare_enable(pcm512x->sclk);
 552                 if (ret != 0) {
 553                         dev_err(dev, "Failed to enable SCLK: %d\n", ret);
 554                         return ret;
 555                 }
 556         }
 557
 558         ret = regulator_bulk_enable(ARRAY_SIZE(pcm512x->supplies),
 559                                     pcm512x->supplies);
 560         if (ret != 0) {
 561                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 562                 return ret;
 563         }
 564
 565         regcache_cache_only(pcm512x->regmap, false);
 566         ret = regcache_sync(pcm512x->regmap);
 567         if (ret != 0) {
 568                 dev_err(dev, "Failed to sync cache: %d\n", ret);
 569                 return ret;
 570         }
 571
 572         ret = regmap_update_bits(pcm512x->regmap, PCM512x_POWER,
 573                                  PCM512x_RQPD, 0);
 574         if (ret != 0) {
 575                 dev_err(dev, "Failed to remove power down: %d\n", ret);
 576                 return ret;
 577         }
 578
 579         return 0;
 580 }
 581
 582 const struct dev_pm_ops pcm512x_pm_ops = {
 583         SET_RUNTIME_PM_OPS(pcm512x_suspend, pcm512x_resume, NULL)
 584 };
 585 EXPORT_SYMBOL_GPL(pcm512x_pm_ops);
 586
 587 MODULE_DESCRIPTION("ASoC PCM512x codec driver");
 588 MODULE_AUTHOR("Mark Brown <broonie@linaro.org>");
 589 MODULE_LICENSE("GPL v2");