sound/soc/codecs/tas6424.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ALSA SoC Texas Instruments TAS6424 Quad-Channel Audio Amplifier
   4  *
   5  * Copyright (C) 2016-2017 Texas Instruments Incorporated - http://www.ti.com/
   6  *      Author: Andreas Dannenberg <dannenberg@ti.com>
   7  *      Andrew F. Davis <afd@ti.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/errno.h>
  12 #include <linux/device.h>
  13 #include <linux/i2c.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/regmap.h>
  16 #include <linux/slab.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <linux/delay.h>
  19 #include <linux/gpio/consumer.h>
  20
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/soc.h>
  24 #include <sound/soc-dapm.h>
  25 #include <sound/tlv.h>
  26
  27 #include "tas6424.h"
  28
  29 /* Define how often to check (and clear) the fault status register (in ms) */
  30 #define TAS6424_FAULT_CHECK_INTERVAL 200
  31
  32 static const char * const tas6424_supply_names[] = {
  33         "dvdd", /* Digital power supply. Connect to 3.3-V supply. */
  34         "vbat", /* Supply used for higher voltage analog circuits. */
  35         "pvdd", /* Class-D amp output FETs supply. */
  36 };
  37 #define TAS6424_NUM_SUPPLIES ARRAY_SIZE(tas6424_supply_names)
  38
  39 struct tas6424_data {
  40         struct device *dev;
  41         struct regmap *regmap;
  42         struct regulator_bulk_data supplies[TAS6424_NUM_SUPPLIES];
  43         struct delayed_work fault_check_work;
  44         unsigned int last_fault1;
  45         unsigned int last_fault2;
  46         unsigned int last_warn;
  47         struct gpio_desc *standby_gpio;
  48         struct gpio_desc *mute_gpio;
  49 };
  50
  51 /*
  52  * DAC digital volumes. From -103.5 to 24 dB in 0.5 dB steps. Note that
  53  * setting the gain below -100 dB (register value <0x7) is effectively a MUTE
  54  * as per device datasheet.
  55  */
  56 static DECLARE_TLV_DB_SCALE(dac_tlv, -10350, 50, 0);
  57
  58 static const struct snd_kcontrol_new tas6424_snd_controls[] = {
  59         SOC_SINGLE_TLV("Speaker Driver CH1 Playback Volume",
  60                        TAS6424_CH1_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  61         SOC_SINGLE_TLV("Speaker Driver CH2 Playback Volume",
  62                        TAS6424_CH2_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  63         SOC_SINGLE_TLV("Speaker Driver CH3 Playback Volume",
  64                        TAS6424_CH3_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  65         SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",
  66                        TAS6424_CH4_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  67         SOC_SINGLE_STROBE("Auto Diagnostics Switch", TAS6424_DC_DIAG_CTRL1,
  68                           TAS6424_LDGBYPASS_SHIFT, 1),
  69 };
  70
  71 static int tas6424_dac_event(struct snd_soc_dapm_widget *w,
  72                              struct snd_kcontrol *kcontrol, int event)
  73 {
  74         struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
  75         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
  76
  77         dev_dbg(component->dev, "%s() event=0x%0x\n", __func__, event);
  78
  79         if (event & SND_SOC_DAPM_POST_PMU) {
  80                 /* Observe codec shutdown-to-active time */
  81                 msleep(12);
  82
  83                 /* Turn on TAS6424 periodic fault checking/handling */
  84                 tas6424->last_fault1 = 0;
  85                 tas6424->last_fault2 = 0;
  86                 tas6424->last_warn = 0;
  87                 schedule_delayed_work(&tas6424->fault_check_work,
  88                                       msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
  89         } else if (event & SND_SOC_DAPM_PRE_PMD) {
  90                 /* Disable TAS6424 periodic fault checking/handling */
  91                 cancel_delayed_work_sync(&tas6424->fault_check_work);
  92         }
  93
  94         return 0;
  95 }
  96
  97 static const struct snd_soc_dapm_widget tas6424_dapm_widgets[] = {
  98         SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
  99         SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas6424_dac_event,
 100                            SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 101         SND_SOC_DAPM_OUTPUT("OUT")
 102 };
 103
 104 static const struct snd_soc_dapm_route tas6424_audio_map[] = {
 105         { "DAC", NULL, "DAC IN" },
 106         { "OUT", NULL, "DAC" },
 107 };
 108
 109 static int tas6424_hw_params(struct snd_pcm_substream *substream,
 110                              struct snd_pcm_hw_params *params,
 111                              struct snd_soc_dai *dai)
 112 {
 113         struct snd_soc_component *component = dai->component;
 114         unsigned int rate = params_rate(params);
 115         unsigned int width = params_width(params);
 116         u8 sap_ctrl = 0;
 117
 118         dev_dbg(component->dev, "%s() rate=%u width=%u\n", __func__, rate, width);
 119
 120         switch (rate) {
 121         case 44100:
 122                 sap_ctrl |= TAS6424_SAP_RATE_44100;
 123                 break;
 124         case 48000:
 125                 sap_ctrl |= TAS6424_SAP_RATE_48000;
 126                 break;
 127         case 96000:
 128                 sap_ctrl |= TAS6424_SAP_RATE_96000;
 129                 break;
 130         default:
 131                 dev_err(component->dev, "unsupported sample rate: %u\n", rate);
 132                 return -EINVAL;
 133         }
 134
 135         switch (width) {
 136         case 16:
 137                 sap_ctrl |= TAS6424_SAP_TDM_SLOT_SZ_16;
 138                 break;
 139         case 24:
 140                 break;
 141         default:
 142                 dev_err(component->dev, "unsupported sample width: %u\n", width);
 143                 return -EINVAL;
 144         }
 145
 146         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
 147                             TAS6424_SAP_RATE_MASK |
 148                             TAS6424_SAP_TDM_SLOT_SZ_16,
 149                             sap_ctrl);
 150
 151         return 0;
 152 }
 153
 154 static int tas6424_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 155 {
 156         struct snd_soc_component *component = dai->component;
 157         u8 serial_format = 0;
 158
 159         dev_dbg(component->dev, "%s() fmt=0x%0x\n", __func__, fmt);
 160
 161         /* clock masters */
 162         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 163         case SND_SOC_DAIFMT_CBS_CFS:
 164                 break;
 165         default:
 166                 dev_err(component->dev, "Invalid DAI master/slave interface\n");
 167                 return -EINVAL;
 168         }
 169
 170         /* signal polarity */
 171         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 172         case SND_SOC_DAIFMT_NB_NF:
 173                 break;
 174         default:
 175                 dev_err(component->dev, "Invalid DAI clock signal polarity\n");
 176                 return -EINVAL;
 177         }
 178
 179         /* interface format */
 180         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 181         case SND_SOC_DAIFMT_I2S:
 182                 serial_format |= TAS6424_SAP_I2S;
 183                 break;
 184         case SND_SOC_DAIFMT_DSP_A:
 185                 serial_format |= TAS6424_SAP_DSP;
 186                 break;
 187         case SND_SOC_DAIFMT_DSP_B:
 188                 /*
 189                  * We can use the fact that the TAS6424 does not care about the
 190                  * LRCLK duty cycle during TDM to receive DSP_B formatted data
 191                  * in LEFTJ mode (no delaying of the 1st data bit).
 192                  */
 193                 serial_format |= TAS6424_SAP_LEFTJ;
 194                 break;
 195         case SND_SOC_DAIFMT_LEFT_J:
 196                 serial_format |= TAS6424_SAP_LEFTJ;
 197                 break;
 198         default:
 199                 dev_err(component->dev, "Invalid DAI interface format\n");
 200                 return -EINVAL;
 201         }
 202
 203         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
 204                             TAS6424_SAP_FMT_MASK, serial_format);
 205
 206         return 0;
 207 }
 208
 209 static int tas6424_set_dai_tdm_slot(struct snd_soc_dai *dai,
 210                                     unsigned int tx_mask, unsigned int rx_mask,
 211                                     int slots, int slot_width)
 212 {
 213         struct snd_soc_component *component = dai->component;
 214         unsigned int first_slot, last_slot;
 215         bool sap_tdm_slot_last;
 216
 217         dev_dbg(component->dev, "%s() tx_mask=%d rx_mask=%d\n", __func__,
 218                 tx_mask, rx_mask);
 219
 220         if (!tx_mask || !rx_mask)
 221                 return 0; /* nothing needed to disable TDM mode */
 222
 223         /*
 224          * Determine the first slot and last slot that is being requested so
 225          * we'll be able to more easily enforce certain constraints as the
 226          * TAS6424's TDM interface is not fully configurable.
 227          */
 228         first_slot = __ffs(tx_mask);
 229         last_slot = __fls(rx_mask);
 230
 231         if (last_slot - first_slot != 4) {
 232                 dev_err(component->dev, "tdm mask must cover 4 contiguous slots\n");
 233                 return -EINVAL;
 234         }
 235
 236         switch (first_slot) {
 237         case 0:
 238                 sap_tdm_slot_last = false;
 239                 break;
 240         case 4:
 241                 sap_tdm_slot_last = true;
 242                 break;
 243         default:
 244                 dev_err(component->dev, "tdm mask must start at slot 0 or 4\n");
 245                 return -EINVAL;
 246         }
 247
 248         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL, TAS6424_SAP_TDM_SLOT_LAST,
 249                             sap_tdm_slot_last ? TAS6424_SAP_TDM_SLOT_LAST : 0);
 250
 251         return 0;
 252 }
 253
 254 static int tas6424_mute(struct snd_soc_dai *dai, int mute)
 255 {
 256         struct snd_soc_component *component = dai->component;
 257         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
 258         unsigned int val;
 259
 260         dev_dbg(component->dev, "%s() mute=%d\n", __func__, mute);
 261
 262         if (tas6424->mute_gpio) {
 263                 gpiod_set_value_cansleep(tas6424->mute_gpio, mute);
 264                 return 0;
 265         }
 266
 267         if (mute)
 268                 val = TAS6424_ALL_STATE_MUTE;
 269         else
 270                 val = TAS6424_ALL_STATE_PLAY;
 271
 272         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, val);
 273
 274         return 0;
 275 }
 276
 277 static int tas6424_power_off(struct snd_soc_component *component)
 278 {
 279         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
 280         int ret;
 281
 282         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_HIZ);
 283
 284         regcache_cache_only(tas6424->regmap, true);
 285         regcache_mark_dirty(tas6424->regmap);
 286
 287         ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
 288                                      tas6424->supplies);
 289         if (ret < 0) {
 290                 dev_err(component->dev, "failed to disable supplies: %d\n", ret);
 291                 return ret;
 292         }
 293
 294         return 0;
 295 }
 296
 297 static int tas6424_power_on(struct snd_soc_component *component)
 298 {
 299         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
 300         int ret;
 301         u8 chan_states;
 302         int no_auto_diags = 0;
 303         unsigned int reg_val;
 304
 305         if (!regmap_read(tas6424->regmap, TAS6424_DC_DIAG_CTRL1, &reg_val))
 306                 no_auto_diags = reg_val & TAS6424_LDGBYPASS_MASK;
 307
 308         ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
 309                                     tas6424->supplies);
 310         if (ret < 0) {
 311                 dev_err(component->dev, "failed to enable supplies: %d\n", ret);
 312                 return ret;
 313         }
 314
 315         regcache_cache_only(tas6424->regmap, false);
 316
 317         ret = regcache_sync(tas6424->regmap);
 318         if (ret < 0) {
 319                 dev_err(component->dev, "failed to sync regcache: %d\n", ret);
 320                 return ret;
 321         }
 322
 323         if (tas6424->mute_gpio) {
 324                 gpiod_set_value_cansleep(tas6424->mute_gpio, 0);
 325                 /*
 326                  * channels are muted via the mute pin.  Don't also mute
 327                  * them via the registers so that subsequent register
 328                  * access is not necessary to un-mute the channels
 329                  */
 330                 chan_states = TAS6424_ALL_STATE_PLAY;
 331         } else {
 332                 chan_states = TAS6424_ALL_STATE_MUTE;
 333         }
 334         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, chan_states);
 335
 336         /* any time we come out of HIZ, the output channels automatically run DC
 337          * load diagnostics if autodiagnotics are enabled. wait here until this
 338          * completes.
 339          */
 340         if (!no_auto_diags)
 341                 msleep(230);
 342
 343         return 0;
 344 }
 345
 346 static int tas6424_set_bias_level(struct snd_soc_component *component,
 347                                   enum snd_soc_bias_level level)
 348 {
 349         dev_dbg(component->dev, "%s() level=%d\n", __func__, level);
 350
 351         switch (level) {
 352         case SND_SOC_BIAS_ON:
 353         case SND_SOC_BIAS_PREPARE:
 354                 break;
 355         case SND_SOC_BIAS_STANDBY:
 356                 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF)
 357                         tas6424_power_on(component);
 358                 break;
 359         case SND_SOC_BIAS_OFF:
 360                 tas6424_power_off(component);
 361                 break;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static struct snd_soc_component_driver soc_codec_dev_tas6424 = {
 368         .set_bias_level         = tas6424_set_bias_level,
 369         .controls               = tas6424_snd_controls,
 370         .num_controls           = ARRAY_SIZE(tas6424_snd_controls),
 371         .dapm_widgets           = tas6424_dapm_widgets,
 372         .num_dapm_widgets       = ARRAY_SIZE(tas6424_dapm_widgets),
 373         .dapm_routes            = tas6424_audio_map,
 374         .num_dapm_routes        = ARRAY_SIZE(tas6424_audio_map),
 375         .use_pmdown_time        = 1,
 376         .endianness             = 1,
 377         .non_legacy_dai_naming  = 1,
 378 };
 379
 380 static struct snd_soc_dai_ops tas6424_speaker_dai_ops = {
 381         .hw_params      = tas6424_hw_params,
 382         .set_fmt        = tas6424_set_dai_fmt,
 383         .set_tdm_slot   = tas6424_set_dai_tdm_slot,
 384         .digital_mute   = tas6424_mute,
 385 };
 386
 387 static struct snd_soc_dai_driver tas6424_dai[] = {
 388         {
 389                 .name = "tas6424-amplifier",
 390                 .playback = {
 391                         .stream_name = "Playback",
 392                         .channels_min = 1,
 393                         .channels_max = 4,
 394                         .rates = TAS6424_RATES,
 395                         .formats = TAS6424_FORMATS,
 396                 },
 397                 .ops = &tas6424_speaker_dai_ops,
 398         },
 399 };
 400
 401 static void tas6424_fault_check_work(struct work_struct *work)
 402 {
 403         struct tas6424_data *tas6424 = container_of(work, struct tas6424_data,
 404                                                     fault_check_work.work);
 405         struct device *dev = tas6424->dev;
 406         unsigned int reg;
 407         int ret;
 408
 409         ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT1, &reg);
 410         if (ret < 0) {
 411                 dev_err(dev, "failed to read GLOB_FAULT1 register: %d\n", ret);
 412                 goto out;
 413         }
 414
 415         /*
 416          * Ignore any clock faults as there is no clean way to check for them.
 417          * We would need to start checking for those faults *after* the SAIF
 418          * stream has been setup, and stop checking *before* the stream is
 419          * stopped to avoid any false-positives. However there are no
 420          * appropriate hooks to monitor these events.
 421          */
 422         reg &= TAS6424_FAULT_PVDD_OV |
 423                TAS6424_FAULT_VBAT_OV |
 424                TAS6424_FAULT_PVDD_UV |
 425                TAS6424_FAULT_VBAT_UV;
 426
 427         if (!reg) {
 428                 tas6424->last_fault1 = reg;
 429                 goto check_global_fault2_reg;
 430         }
 431
 432         /*
 433          * Only flag errors once for a given occurrence. This is needed as
 434          * the TAS6424 will take time clearing the fault condition internally
 435          * during which we don't want to bombard the system with the same
 436          * error message over and over.
 437          */
 438         if ((reg & TAS6424_FAULT_PVDD_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_OV))
 439                 dev_crit(dev, "experienced a PVDD overvoltage fault\n");
 440
 441         if ((reg & TAS6424_FAULT_VBAT_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_OV))
 442                 dev_crit(dev, "experienced a VBAT overvoltage fault\n");
 443
 444         if ((reg & TAS6424_FAULT_PVDD_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_UV))
 445                 dev_crit(dev, "experienced a PVDD undervoltage fault\n");
 446
 447         if ((reg & TAS6424_FAULT_VBAT_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_UV))
 448                 dev_crit(dev, "experienced a VBAT undervoltage fault\n");
 449
 450         /* Store current fault1 value so we can detect any changes next time */
 451         tas6424->last_fault1 = reg;
 452
 453 check_global_fault2_reg:
 454         ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT2, &reg);
 455         if (ret < 0) {
 456                 dev_err(dev, "failed to read GLOB_FAULT2 register: %d\n", ret);
 457                 goto out;
 458         }
 459
 460         reg &= TAS6424_FAULT_OTSD |
 461                TAS6424_FAULT_OTSD_CH1 |
 462                TAS6424_FAULT_OTSD_CH2 |
 463                TAS6424_FAULT_OTSD_CH3 |
 464                TAS6424_FAULT_OTSD_CH4;
 465
 466         if (!reg) {
 467                 tas6424->last_fault2 = reg;
 468                 goto check_warn_reg;
 469         }
 470
 471         if ((reg & TAS6424_FAULT_OTSD) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD))
 472                 dev_crit(dev, "experienced a global overtemp shutdown\n");
 473
 474         if ((reg & TAS6424_FAULT_OTSD_CH1) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH1))
 475                 dev_crit(dev, "experienced an overtemp shutdown on CH1\n");
 476
 477         if ((reg & TAS6424_FAULT_OTSD_CH2) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH2))
 478                 dev_crit(dev, "experienced an overtemp shutdown on CH2\n");
 479
 480         if ((reg & TAS6424_FAULT_OTSD_CH3) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH3))
 481                 dev_crit(dev, "experienced an overtemp shutdown on CH3\n");
 482
 483         if ((reg & TAS6424_FAULT_OTSD_CH4) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH4))
 484                 dev_crit(dev, "experienced an overtemp shutdown on CH4\n");
 485
 486         /* Store current fault2 value so we can detect any changes next time */
 487         tas6424->last_fault2 = reg;
 488
 489 check_warn_reg:
 490         ret = regmap_read(tas6424->regmap, TAS6424_WARN, &reg);
 491         if (ret < 0) {
 492                 dev_err(dev, "failed to read WARN register: %d\n", ret);
 493                 goto out;
 494         }
 495
 496         reg &= TAS6424_WARN_VDD_UV |
 497                TAS6424_WARN_VDD_POR |
 498                TAS6424_WARN_VDD_OTW |
 499                TAS6424_WARN_VDD_OTW_CH1 |
 500                TAS6424_WARN_VDD_OTW_CH2 |
 501                TAS6424_WARN_VDD_OTW_CH3 |
 502                TAS6424_WARN_VDD_OTW_CH4;
 503
 504         if (!reg) {
 505                 tas6424->last_warn = reg;
 506                 goto out;
 507         }
 508
 509         if ((reg & TAS6424_WARN_VDD_UV) && !(tas6424->last_warn & TAS6424_WARN_VDD_UV))
 510                 dev_warn(dev, "experienced a VDD under voltage condition\n");
 511
 512         if ((reg & TAS6424_WARN_VDD_POR) && !(tas6424->last_warn & TAS6424_WARN_VDD_POR))
 513                 dev_warn(dev, "experienced a VDD POR condition\n");
 514
 515         if ((reg & TAS6424_WARN_VDD_OTW) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW))
 516                 dev_warn(dev, "experienced a global overtemp warning\n");
 517
 518         if ((reg & TAS6424_WARN_VDD_OTW_CH1) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH1))
 519                 dev_warn(dev, "experienced an overtemp warning on CH1\n");
 520
 521         if ((reg & TAS6424_WARN_VDD_OTW_CH2) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH2))
 522                 dev_warn(dev, "experienced an overtemp warning on CH2\n");
 523
 524         if ((reg & TAS6424_WARN_VDD_OTW_CH3) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH3))
 525                 dev_warn(dev, "experienced an overtemp warning on CH3\n");
 526
 527         if ((reg & TAS6424_WARN_VDD_OTW_CH4) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH4))
 528                 dev_warn(dev, "experienced an overtemp warning on CH4\n");
 529
 530         /* Store current warn value so we can detect any changes next time */
 531         tas6424->last_warn = reg;
 532
 533         /* Clear any warnings by toggling the CLEAR_FAULT control bit */
 534         ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
 535                                 TAS6424_CLEAR_FAULT, TAS6424_CLEAR_FAULT);
 536         if (ret < 0)
 537                 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
 538
 539         ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
 540                                 TAS6424_CLEAR_FAULT, 0);
 541         if (ret < 0)
 542                 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
 543
 544 out:
 545         /* Schedule the next fault check at the specified interval */
 546         schedule_delayed_work(&tas6424->fault_check_work,
 547                               msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
 548 }
 549
 550 static const struct reg_default tas6424_reg_defaults[] = {
 551         { TAS6424_MODE_CTRL,            0x00 },
 552         { TAS6424_MISC_CTRL1,           0x32 },
 553         { TAS6424_MISC_CTRL2,           0x62 },
 554         { TAS6424_SAP_CTRL,             0x04 },
 555         { TAS6424_CH_STATE_CTRL,        0x55 },
 556         { TAS6424_CH1_VOL_CTRL,         0xcf },
 557         { TAS6424_CH2_VOL_CTRL,         0xcf },
 558         { TAS6424_CH3_VOL_CTRL,         0xcf },
 559         { TAS6424_CH4_VOL_CTRL,         0xcf },
 560         { TAS6424_DC_DIAG_CTRL1,        0x00 },
 561         { TAS6424_DC_DIAG_CTRL2,        0x11 },
 562         { TAS6424_DC_DIAG_CTRL3,        0x11 },
 563         { TAS6424_PIN_CTRL,             0xff },
 564         { TAS6424_AC_DIAG_CTRL1,        0x00 },
 565         { TAS6424_MISC_CTRL3,           0x00 },
 566         { TAS6424_CLIP_CTRL,            0x01 },
 567         { TAS6424_CLIP_WINDOW,          0x14 },
 568         { TAS6424_CLIP_WARN,            0x00 },
 569         { TAS6424_CBC_STAT,             0x00 },
 570         { TAS6424_MISC_CTRL4,           0x40 },
 571 };
 572
 573 static bool tas6424_is_writable_reg(struct device *dev, unsigned int reg)
 574 {
 575         switch (reg) {
 576         case TAS6424_MODE_CTRL:
 577         case TAS6424_MISC_CTRL1:
 578         case TAS6424_MISC_CTRL2:
 579         case TAS6424_SAP_CTRL:
 580         case TAS6424_CH_STATE_CTRL:
 581         case TAS6424_CH1_VOL_CTRL:
 582         case TAS6424_CH2_VOL_CTRL:
 583         case TAS6424_CH3_VOL_CTRL:
 584         case TAS6424_CH4_VOL_CTRL:
 585         case TAS6424_DC_DIAG_CTRL1:
 586         case TAS6424_DC_DIAG_CTRL2:
 587         case TAS6424_DC_DIAG_CTRL3:
 588         case TAS6424_PIN_CTRL:
 589         case TAS6424_AC_DIAG_CTRL1:
 590         case TAS6424_MISC_CTRL3:
 591         case TAS6424_CLIP_CTRL:
 592         case TAS6424_CLIP_WINDOW:
 593         case TAS6424_CLIP_WARN:
 594         case TAS6424_CBC_STAT:
 595         case TAS6424_MISC_CTRL4:
 596                 return true;
 597         default:
 598                 return false;
 599         }
 600 }
 601
 602 static bool tas6424_is_volatile_reg(struct device *dev, unsigned int reg)
 603 {
 604         switch (reg) {
 605         case TAS6424_DC_LOAD_DIAG_REP12:
 606         case TAS6424_DC_LOAD_DIAG_REP34:
 607         case TAS6424_DC_LOAD_DIAG_REPLO:
 608         case TAS6424_CHANNEL_STATE:
 609         case TAS6424_CHANNEL_FAULT:
 610         case TAS6424_GLOB_FAULT1:
 611         case TAS6424_GLOB_FAULT2:
 612         case TAS6424_WARN:
 613         case TAS6424_AC_LOAD_DIAG_REP1:
 614         case TAS6424_AC_LOAD_DIAG_REP2:
 615         case TAS6424_AC_LOAD_DIAG_REP3:
 616         case TAS6424_AC_LOAD_DIAG_REP4:
 617                 return true;
 618         default:
 619                 return false;
 620         }
 621 }
 622
 623 static const struct regmap_config tas6424_regmap_config = {
 624         .reg_bits = 8,
 625         .val_bits = 8,
 626
 627         .writeable_reg = tas6424_is_writable_reg,
 628         .volatile_reg = tas6424_is_volatile_reg,
 629
 630         .max_register = TAS6424_MAX,
 631         .reg_defaults = tas6424_reg_defaults,
 632         .num_reg_defaults = ARRAY_SIZE(tas6424_reg_defaults),
 633         .cache_type = REGCACHE_RBTREE,
 634 };
 635
 636 #if IS_ENABLED(CONFIG_OF)
 637 static const struct of_device_id tas6424_of_ids[] = {
 638         { .compatible = "ti,tas6424", },
 639         { },
 640 };
 641 MODULE_DEVICE_TABLE(of, tas6424_of_ids);
 642 #endif
 643
 644 static int tas6424_i2c_probe(struct i2c_client *client,
 645                              const struct i2c_device_id *id)
 646 {
 647         struct device *dev = &client->dev;
 648         struct tas6424_data *tas6424;
 649         int ret;
 650         int i;
 651
 652         tas6424 = devm_kzalloc(dev, sizeof(*tas6424), GFP_KERNEL);
 653         if (!tas6424)
 654                 return -ENOMEM;
 655         dev_set_drvdata(dev, tas6424);
 656
 657         tas6424->dev = dev;
 658
 659         tas6424->regmap = devm_regmap_init_i2c(client, &tas6424_regmap_config);
 660         if (IS_ERR(tas6424->regmap)) {
 661                 ret = PTR_ERR(tas6424->regmap);
 662                 dev_err(dev, "unable to allocate register map: %d\n", ret);
 663                 return ret;
 664         }
 665
 666         /*
 667          * Get control of the standby pin and set it LOW to take the codec
 668          * out of the stand-by mode.
 669          * Note: The actual pin polarity is taken care of in the GPIO lib
 670          * according the polarity specified in the DTS.
 671          */
 672         tas6424->standby_gpio = devm_gpiod_get_optional(dev, "standby",
 673                                                       GPIOD_OUT_LOW);
 674         if (IS_ERR(tas6424->standby_gpio)) {
 675                 if (PTR_ERR(tas6424->standby_gpio) == -EPROBE_DEFER)
 676                         return -EPROBE_DEFER;
 677                 dev_info(dev, "failed to get standby GPIO: %ld\n",
 678                         PTR_ERR(tas6424->standby_gpio));
 679                 tas6424->standby_gpio = NULL;
 680         }
 681
 682         /*
 683          * Get control of the mute pin and set it HIGH in order to start with
 684          * all the output muted.
 685          * Note: The actual pin polarity is taken care of in the GPIO lib
 686          * according the polarity specified in the DTS.
 687          */
 688         tas6424->mute_gpio = devm_gpiod_get_optional(dev, "mute",
 689                                                       GPIOD_OUT_HIGH);
 690         if (IS_ERR(tas6424->mute_gpio)) {
 691                 if (PTR_ERR(tas6424->mute_gpio) == -EPROBE_DEFER)
 692                         return -EPROBE_DEFER;
 693                 dev_info(dev, "failed to get nmute GPIO: %ld\n",
 694                         PTR_ERR(tas6424->mute_gpio));
 695                 tas6424->mute_gpio = NULL;
 696         }
 697
 698         for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)
 699                 tas6424->supplies[i].supply = tas6424_supply_names[i];
 700         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),
 701                                       tas6424->supplies);
 702         if (ret) {
 703                 dev_err(dev, "unable to request supplies: %d\n", ret);
 704                 return ret;
 705         }
 706
 707         ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
 708                                     tas6424->supplies);
 709         if (ret) {
 710                 dev_err(dev, "unable to enable supplies: %d\n", ret);
 711                 return ret;
 712         }
 713
 714         /* Reset device to establish well-defined startup state */
 715         ret = regmap_update_bits(tas6424->regmap, TAS6424_MODE_CTRL,
 716                                  TAS6424_RESET, TAS6424_RESET);
 717         if (ret) {
 718                 dev_err(dev, "unable to reset device: %d\n", ret);
 719                 return ret;
 720         }
 721
 722         INIT_DELAYED_WORK(&tas6424->fault_check_work, tas6424_fault_check_work);
 723
 724         ret = devm_snd_soc_register_component(dev, &soc_codec_dev_tas6424,
 725                                      tas6424_dai, ARRAY_SIZE(tas6424_dai));
 726         if (ret < 0) {
 727                 dev_err(dev, "unable to register codec: %d\n", ret);
 728                 return ret;
 729         }
 730
 731         return 0;
 732 }
 733
 734 static int tas6424_i2c_remove(struct i2c_client *client)
 735 {
 736         struct device *dev = &client->dev;
 737         struct tas6424_data *tas6424 = dev_get_drvdata(dev);
 738         int ret;
 739
 740         cancel_delayed_work_sync(&tas6424->fault_check_work);
 741
 742         /* put the codec in stand-by */
 743         if (tas6424->standby_gpio)
 744                 gpiod_set_value_cansleep(tas6424->standby_gpio, 1);
 745
 746         ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
 747                                      tas6424->supplies);
 748         if (ret < 0) {
 749                 dev_err(dev, "unable to disable supplies: %d\n", ret);
 750                 return ret;
 751         }
 752
 753         return 0;
 754 }
 755
 756 static const struct i2c_device_id tas6424_i2c_ids[] = {
 757         { "tas6424", 0 },
 758         { }
 759 };
 760 MODULE_DEVICE_TABLE(i2c, tas6424_i2c_ids);
 761
 762 static struct i2c_driver tas6424_i2c_driver = {
 763         .driver = {
 764                 .name = "tas6424",
 765                 .of_match_table = of_match_ptr(tas6424_of_ids),
 766         },
 767         .probe = tas6424_i2c_probe,
 768         .remove = tas6424_i2c_remove,
 769         .id_table = tas6424_i2c_ids,
 770 };
 771 module_i2c_driver(tas6424_i2c_driver);
 772
 773 MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");
 774 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 775 MODULE_DESCRIPTION("TAS6424 Audio amplifier driver");
 776 MODULE_LICENSE("GPL v2");