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
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23 #include <sound/soc-dapm.h>
  24 #include <sound/tlv.h>
  25
  26 #include "tas6424.h"
  27
  28 /* Define how often to check (and clear) the fault status register (in ms) */
  29 #define TAS6424_FAULT_CHECK_INTERVAL 200
  30
  31 static const char * const tas6424_supply_names[] = {
  32         "dvdd", /* Digital power supply. Connect to 3.3-V supply. */
  33         "vbat", /* Supply used for higher voltage analog circuits. */
  34         "pvdd", /* Class-D amp output FETs supply. */
  35 };
  36 #define TAS6424_NUM_SUPPLIES ARRAY_SIZE(tas6424_supply_names)
  37
  38 struct tas6424_data {
  39         struct device *dev;
  40         struct regmap *regmap;
  41         struct regulator_bulk_data supplies[TAS6424_NUM_SUPPLIES];
  42         struct delayed_work fault_check_work;
  43         unsigned int last_fault1;
  44         unsigned int last_fault2;
  45         unsigned int last_warn;
  46 };
  47
  48 /*
  49  * DAC digital volumes. From -103.5 to 24 dB in 0.5 dB steps. Note that
  50  * setting the gain below -100 dB (register value <0x7) is effectively a MUTE
  51  * as per device datasheet.
  52  */
  53 static DECLARE_TLV_DB_SCALE(dac_tlv, -10350, 50, 0);
  54
  55 static const struct snd_kcontrol_new tas6424_snd_controls[] = {
  56         SOC_SINGLE_TLV("Speaker Driver CH1 Playback Volume",
  57                        TAS6424_CH1_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  58         SOC_SINGLE_TLV("Speaker Driver CH2 Playback Volume",
  59                        TAS6424_CH2_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  60         SOC_SINGLE_TLV("Speaker Driver CH3 Playback Volume",
  61                        TAS6424_CH3_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  62         SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",
  63                        TAS6424_CH4_VOL_CTRL, 0, 0xff, 0, dac_tlv),
  64 };
  65
  66 static int tas6424_dac_event(struct snd_soc_dapm_widget *w,
  67                              struct snd_kcontrol *kcontrol, int event)
  68 {
  69         struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
  70         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
  71
  72         dev_dbg(component->dev, "%s() event=0x%0x\n", __func__, event);
  73
  74         if (event & SND_SOC_DAPM_POST_PMU) {
  75                 /* Observe codec shutdown-to-active time */
  76                 msleep(12);
  77
  78                 /* Turn on TAS6424 periodic fault checking/handling */
  79                 tas6424->last_fault1 = 0;
  80                 tas6424->last_fault2 = 0;
  81                 tas6424->last_warn = 0;
  82                 schedule_delayed_work(&tas6424->fault_check_work,
  83                                       msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
  84         } else if (event & SND_SOC_DAPM_PRE_PMD) {
  85                 /* Disable TAS6424 periodic fault checking/handling */
  86                 cancel_delayed_work_sync(&tas6424->fault_check_work);
  87         }
  88
  89         return 0;
  90 }
  91
  92 static const struct snd_soc_dapm_widget tas6424_dapm_widgets[] = {
  93         SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
  94         SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas6424_dac_event,
  95                            SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
  96         SND_SOC_DAPM_OUTPUT("OUT")
  97 };
  98
  99 static const struct snd_soc_dapm_route tas6424_audio_map[] = {
 100         { "DAC", NULL, "DAC IN" },
 101         { "OUT", NULL, "DAC" },
 102 };
 103
 104 static int tas6424_hw_params(struct snd_pcm_substream *substream,
 105                              struct snd_pcm_hw_params *params,
 106                              struct snd_soc_dai *dai)
 107 {
 108         struct snd_soc_component *component = dai->component;
 109         unsigned int rate = params_rate(params);
 110         unsigned int width = params_width(params);
 111         u8 sap_ctrl = 0;
 112
 113         dev_dbg(component->dev, "%s() rate=%u width=%u\n", __func__, rate, width);
 114
 115         switch (rate) {
 116         case 44100:
 117                 sap_ctrl |= TAS6424_SAP_RATE_44100;
 118                 break;
 119         case 48000:
 120                 sap_ctrl |= TAS6424_SAP_RATE_48000;
 121                 break;
 122         case 96000:
 123                 sap_ctrl |= TAS6424_SAP_RATE_96000;
 124                 break;
 125         default:
 126                 dev_err(component->dev, "unsupported sample rate: %u\n", rate);
 127                 return -EINVAL;
 128         }
 129
 130         switch (width) {
 131         case 16:
 132                 sap_ctrl |= TAS6424_SAP_TDM_SLOT_SZ_16;
 133                 break;
 134         case 24:
 135                 break;
 136         default:
 137                 dev_err(component->dev, "unsupported sample width: %u\n", width);
 138                 return -EINVAL;
 139         }
 140
 141         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
 142                             TAS6424_SAP_RATE_MASK |
 143                             TAS6424_SAP_TDM_SLOT_SZ_16,
 144                             sap_ctrl);
 145
 146         return 0;
 147 }
 148
 149 static int tas6424_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 150 {
 151         struct snd_soc_component *component = dai->component;
 152         u8 serial_format = 0;
 153
 154         dev_dbg(component->dev, "%s() fmt=0x%0x\n", __func__, fmt);
 155
 156         /* clock masters */
 157         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 158         case SND_SOC_DAIFMT_CBS_CFS:
 159                 break;
 160         default:
 161                 dev_err(component->dev, "Invalid DAI master/slave interface\n");
 162                 return -EINVAL;
 163         }
 164
 165         /* signal polarity */
 166         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 167         case SND_SOC_DAIFMT_NB_NF:
 168                 break;
 169         default:
 170                 dev_err(component->dev, "Invalid DAI clock signal polarity\n");
 171                 return -EINVAL;
 172         }
 173
 174         /* interface format */
 175         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 176         case SND_SOC_DAIFMT_I2S:
 177                 serial_format |= TAS6424_SAP_I2S;
 178                 break;
 179         case SND_SOC_DAIFMT_DSP_A:
 180                 serial_format |= TAS6424_SAP_DSP;
 181                 break;
 182         case SND_SOC_DAIFMT_DSP_B:
 183                 /*
 184                  * We can use the fact that the TAS6424 does not care about the
 185                  * LRCLK duty cycle during TDM to receive DSP_B formatted data
 186                  * in LEFTJ mode (no delaying of the 1st data bit).
 187                  */
 188                 serial_format |= TAS6424_SAP_LEFTJ;
 189                 break;
 190         case SND_SOC_DAIFMT_LEFT_J:
 191                 serial_format |= TAS6424_SAP_LEFTJ;
 192                 break;
 193         default:
 194                 dev_err(component->dev, "Invalid DAI interface format\n");
 195                 return -EINVAL;
 196         }
 197
 198         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
 199                             TAS6424_SAP_FMT_MASK, serial_format);
 200
 201         return 0;
 202 }
 203
 204 static int tas6424_set_dai_tdm_slot(struct snd_soc_dai *dai,
 205                                     unsigned int tx_mask, unsigned int rx_mask,
 206                                     int slots, int slot_width)
 207 {
 208         struct snd_soc_component *component = dai->component;
 209         unsigned int first_slot, last_slot;
 210         bool sap_tdm_slot_last;
 211
 212         dev_dbg(component->dev, "%s() tx_mask=%d rx_mask=%d\n", __func__,
 213                 tx_mask, rx_mask);
 214
 215         if (!tx_mask || !rx_mask)
 216                 return 0; /* nothing needed to disable TDM mode */
 217
 218         /*
 219          * Determine the first slot and last slot that is being requested so
 220          * we'll be able to more easily enforce certain constraints as the
 221          * TAS6424's TDM interface is not fully configurable.
 222          */
 223         first_slot = __ffs(tx_mask);
 224         last_slot = __fls(rx_mask);
 225
 226         if (last_slot - first_slot != 4) {
 227                 dev_err(component->dev, "tdm mask must cover 4 contiguous slots\n");
 228                 return -EINVAL;
 229         }
 230
 231         switch (first_slot) {
 232         case 0:
 233                 sap_tdm_slot_last = false;
 234                 break;
 235         case 4:
 236                 sap_tdm_slot_last = true;
 237                 break;
 238         default:
 239                 dev_err(component->dev, "tdm mask must start at slot 0 or 4\n");
 240                 return -EINVAL;
 241         }
 242
 243         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL, TAS6424_SAP_TDM_SLOT_LAST,
 244                             sap_tdm_slot_last ? TAS6424_SAP_TDM_SLOT_LAST : 0);
 245
 246         return 0;
 247 }
 248
 249 static int tas6424_mute(struct snd_soc_dai *dai, int mute)
 250 {
 251         struct snd_soc_component *component = dai->component;
 252         unsigned int val;
 253
 254         dev_dbg(component->dev, "%s() mute=%d\n", __func__, mute);
 255
 256         if (mute)
 257                 val = TAS6424_ALL_STATE_MUTE;
 258         else
 259                 val = TAS6424_ALL_STATE_PLAY;
 260
 261         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, val);
 262
 263         return 0;
 264 }
 265
 266 static int tas6424_power_off(struct snd_soc_component *component)
 267 {
 268         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
 269         int ret;
 270
 271         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_HIZ);
 272
 273         regcache_cache_only(tas6424->regmap, true);
 274         regcache_mark_dirty(tas6424->regmap);
 275
 276         ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
 277                                      tas6424->supplies);
 278         if (ret < 0) {
 279                 dev_err(component->dev, "failed to disable supplies: %d\n", ret);
 280                 return ret;
 281         }
 282
 283         return 0;
 284 }
 285
 286 static int tas6424_power_on(struct snd_soc_component *component)
 287 {
 288         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
 289         int ret;
 290
 291         ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
 292                                     tas6424->supplies);
 293         if (ret < 0) {
 294                 dev_err(component->dev, "failed to enable supplies: %d\n", ret);
 295                 return ret;
 296         }
 297
 298         regcache_cache_only(tas6424->regmap, false);
 299
 300         ret = regcache_sync(tas6424->regmap);
 301         if (ret < 0) {
 302                 dev_err(component->dev, "failed to sync regcache: %d\n", ret);
 303                 return ret;
 304         }
 305
 306         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_MUTE);
 307
 308         /* any time we come out of HIZ, the output channels automatically run DC
 309          * load diagnostics, wait here until this completes
 310          */
 311         msleep(230);
 312
 313         return 0;
 314 }
 315
 316 static int tas6424_set_bias_level(struct snd_soc_component *component,
 317                                   enum snd_soc_bias_level level)
 318 {
 319         dev_dbg(component->dev, "%s() level=%d\n", __func__, level);
 320
 321         switch (level) {
 322         case SND_SOC_BIAS_ON:
 323         case SND_SOC_BIAS_PREPARE:
 324                 break;
 325         case SND_SOC_BIAS_STANDBY:
 326                 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF)
 327                         tas6424_power_on(component);
 328                 break;
 329         case SND_SOC_BIAS_OFF:
 330                 tas6424_power_off(component);
 331                 break;
 332         }
 333
 334         return 0;
 335 }
 336
 337 static struct snd_soc_component_driver soc_codec_dev_tas6424 = {
 338         .set_bias_level         = tas6424_set_bias_level,
 339         .controls               = tas6424_snd_controls,
 340         .num_controls           = ARRAY_SIZE(tas6424_snd_controls),
 341         .dapm_widgets           = tas6424_dapm_widgets,
 342         .num_dapm_widgets       = ARRAY_SIZE(tas6424_dapm_widgets),
 343         .dapm_routes            = tas6424_audio_map,
 344         .num_dapm_routes        = ARRAY_SIZE(tas6424_audio_map),
 345         .use_pmdown_time        = 1,
 346         .endianness             = 1,
 347         .non_legacy_dai_naming  = 1,
 348 };
 349
 350 static struct snd_soc_dai_ops tas6424_speaker_dai_ops = {
 351         .hw_params      = tas6424_hw_params,
 352         .set_fmt        = tas6424_set_dai_fmt,
 353         .set_tdm_slot   = tas6424_set_dai_tdm_slot,
 354         .digital_mute   = tas6424_mute,
 355 };
 356
 357 static struct snd_soc_dai_driver tas6424_dai[] = {
 358         {
 359                 .name = "tas6424-amplifier",
 360                 .playback = {
 361                         .stream_name = "Playback",
 362                         .channels_min = 1,
 363                         .channels_max = 4,
 364                         .rates = TAS6424_RATES,
 365                         .formats = TAS6424_FORMATS,
 366                 },
 367                 .ops = &tas6424_speaker_dai_ops,
 368         },
 369 };
 370
 371 static void tas6424_fault_check_work(struct work_struct *work)
 372 {
 373         struct tas6424_data *tas6424 = container_of(work, struct tas6424_data,
 374                                                     fault_check_work.work);
 375         struct device *dev = tas6424->dev;
 376         unsigned int reg;
 377         int ret;
 378
 379         ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT1, &reg);
 380         if (ret < 0) {
 381                 dev_err(dev, "failed to read FAULT1 register: %d\n", ret);
 382                 goto out;
 383         }
 384
 385         /*
 386          * Ignore any clock faults as there is no clean way to check for them.
 387          * We would need to start checking for those faults *after* the SAIF
 388          * stream has been setup, and stop checking *before* the stream is
 389          * stopped to avoid any false-positives. However there are no
 390          * appropriate hooks to monitor these events.
 391          */
 392         reg &= TAS6424_FAULT_PVDD_OV |
 393                TAS6424_FAULT_VBAT_OV |
 394                TAS6424_FAULT_PVDD_UV |
 395                TAS6424_FAULT_VBAT_UV;
 396
 397         if (reg)
 398                 goto check_global_fault2_reg;
 399
 400         /*
 401          * Only flag errors once for a given occurrence. This is needed as
 402          * the TAS6424 will take time clearing the fault condition internally
 403          * during which we don't want to bombard the system with the same
 404          * error message over and over.
 405          */
 406         if ((reg & TAS6424_FAULT_PVDD_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_OV))
 407                 dev_crit(dev, "experienced a PVDD overvoltage fault\n");
 408
 409         if ((reg & TAS6424_FAULT_VBAT_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_OV))
 410                 dev_crit(dev, "experienced a VBAT overvoltage fault\n");
 411
 412         if ((reg & TAS6424_FAULT_PVDD_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_UV))
 413                 dev_crit(dev, "experienced a PVDD undervoltage fault\n");
 414
 415         if ((reg & TAS6424_FAULT_VBAT_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_UV))
 416                 dev_crit(dev, "experienced a VBAT undervoltage fault\n");
 417
 418         /* Store current fault1 value so we can detect any changes next time */
 419         tas6424->last_fault1 = reg;
 420
 421 check_global_fault2_reg:
 422         ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT2, &reg);
 423         if (ret < 0) {
 424                 dev_err(dev, "failed to read FAULT2 register: %d\n", ret);
 425                 goto out;
 426         }
 427
 428         reg &= TAS6424_FAULT_OTSD |
 429                TAS6424_FAULT_OTSD_CH1 |
 430                TAS6424_FAULT_OTSD_CH2 |
 431                TAS6424_FAULT_OTSD_CH3 |
 432                TAS6424_FAULT_OTSD_CH4;
 433
 434         if (!reg)
 435                 goto check_warn_reg;
 436
 437         if ((reg & TAS6424_FAULT_OTSD) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD))
 438                 dev_crit(dev, "experienced a global overtemp shutdown\n");
 439
 440         if ((reg & TAS6424_FAULT_OTSD_CH1) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH1))
 441                 dev_crit(dev, "experienced an overtemp shutdown on CH1\n");
 442
 443         if ((reg & TAS6424_FAULT_OTSD_CH2) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH2))
 444                 dev_crit(dev, "experienced an overtemp shutdown on CH2\n");
 445
 446         if ((reg & TAS6424_FAULT_OTSD_CH3) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH3))
 447                 dev_crit(dev, "experienced an overtemp shutdown on CH3\n");
 448
 449         if ((reg & TAS6424_FAULT_OTSD_CH4) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH4))
 450                 dev_crit(dev, "experienced an overtemp shutdown on CH4\n");
 451
 452         /* Store current fault2 value so we can detect any changes next time */
 453         tas6424->last_fault2 = reg;
 454
 455 check_warn_reg:
 456         ret = regmap_read(tas6424->regmap, TAS6424_WARN, &reg);
 457         if (ret < 0) {
 458                 dev_err(dev, "failed to read WARN register: %d\n", ret);
 459                 goto out;
 460         }
 461
 462         reg &= TAS6424_WARN_VDD_UV |
 463                TAS6424_WARN_VDD_POR |
 464                TAS6424_WARN_VDD_OTW |
 465                TAS6424_WARN_VDD_OTW_CH1 |
 466                TAS6424_WARN_VDD_OTW_CH2 |
 467                TAS6424_WARN_VDD_OTW_CH3 |
 468                TAS6424_WARN_VDD_OTW_CH4;
 469
 470         if (!reg)
 471                 goto out;
 472
 473         if ((reg & TAS6424_WARN_VDD_UV) && !(tas6424->last_warn & TAS6424_WARN_VDD_UV))
 474                 dev_warn(dev, "experienced a VDD under voltage condition\n");
 475
 476         if ((reg & TAS6424_WARN_VDD_POR) && !(tas6424->last_warn & TAS6424_WARN_VDD_POR))
 477                 dev_warn(dev, "experienced a VDD POR condition\n");
 478
 479         if ((reg & TAS6424_WARN_VDD_OTW) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW))
 480                 dev_warn(dev, "experienced a global overtemp warning\n");
 481
 482         if ((reg & TAS6424_WARN_VDD_OTW_CH1) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH1))
 483                 dev_warn(dev, "experienced an overtemp warning on CH1\n");
 484
 485         if ((reg & TAS6424_WARN_VDD_OTW_CH2) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH2))
 486                 dev_warn(dev, "experienced an overtemp warning on CH2\n");
 487
 488         if ((reg & TAS6424_WARN_VDD_OTW_CH3) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH3))
 489                 dev_warn(dev, "experienced an overtemp warning on CH3\n");
 490
 491         if ((reg & TAS6424_WARN_VDD_OTW_CH4) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH4))
 492                 dev_warn(dev, "experienced an overtemp warning on CH4\n");
 493
 494         /* Store current warn value so we can detect any changes next time */
 495         tas6424->last_warn = reg;
 496
 497         /* Clear any faults by toggling the CLEAR_FAULT control bit */
 498         ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
 499                                 TAS6424_CLEAR_FAULT, TAS6424_CLEAR_FAULT);
 500         if (ret < 0)
 501                 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
 502
 503         ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
 504                                 TAS6424_CLEAR_FAULT, 0);
 505         if (ret < 0)
 506                 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
 507
 508 out:
 509         /* Schedule the next fault check at the specified interval */
 510         schedule_delayed_work(&tas6424->fault_check_work,
 511                               msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
 512 }
 513
 514 static const struct reg_default tas6424_reg_defaults[] = {
 515         { TAS6424_MODE_CTRL,            0x00 },
 516         { TAS6424_MISC_CTRL1,           0x32 },
 517         { TAS6424_MISC_CTRL2,           0x62 },
 518         { TAS6424_SAP_CTRL,             0x04 },
 519         { TAS6424_CH_STATE_CTRL,        0x55 },
 520         { TAS6424_CH1_VOL_CTRL,         0xcf },
 521         { TAS6424_CH2_VOL_CTRL,         0xcf },
 522         { TAS6424_CH3_VOL_CTRL,         0xcf },
 523         { TAS6424_CH4_VOL_CTRL,         0xcf },
 524         { TAS6424_DC_DIAG_CTRL1,        0x00 },
 525         { TAS6424_DC_DIAG_CTRL2,        0x11 },
 526         { TAS6424_DC_DIAG_CTRL3,        0x11 },
 527         { TAS6424_PIN_CTRL,             0xff },
 528         { TAS6424_AC_DIAG_CTRL1,        0x00 },
 529         { TAS6424_MISC_CTRL3,           0x00 },
 530         { TAS6424_CLIP_CTRL,            0x01 },
 531         { TAS6424_CLIP_WINDOW,          0x14 },
 532         { TAS6424_CLIP_WARN,            0x00 },
 533         { TAS6424_CBC_STAT,             0x00 },
 534         { TAS6424_MISC_CTRL4,           0x40 },
 535 };
 536
 537 static bool tas6424_is_writable_reg(struct device *dev, unsigned int reg)
 538 {
 539         switch (reg) {
 540         case TAS6424_MODE_CTRL:
 541         case TAS6424_MISC_CTRL1:
 542         case TAS6424_MISC_CTRL2:
 543         case TAS6424_SAP_CTRL:
 544         case TAS6424_CH_STATE_CTRL:
 545         case TAS6424_CH1_VOL_CTRL:
 546         case TAS6424_CH2_VOL_CTRL:
 547         case TAS6424_CH3_VOL_CTRL:
 548         case TAS6424_CH4_VOL_CTRL:
 549         case TAS6424_DC_DIAG_CTRL1:
 550         case TAS6424_DC_DIAG_CTRL2:
 551         case TAS6424_DC_DIAG_CTRL3:
 552         case TAS6424_PIN_CTRL:
 553         case TAS6424_AC_DIAG_CTRL1:
 554         case TAS6424_MISC_CTRL3:
 555         case TAS6424_CLIP_CTRL:
 556         case TAS6424_CLIP_WINDOW:
 557         case TAS6424_CLIP_WARN:
 558         case TAS6424_CBC_STAT:
 559         case TAS6424_MISC_CTRL4:
 560                 return true;
 561         default:
 562                 return false;
 563         }
 564 }
 565
 566 static bool tas6424_is_volatile_reg(struct device *dev, unsigned int reg)
 567 {
 568         switch (reg) {
 569         case TAS6424_DC_LOAD_DIAG_REP12:
 570         case TAS6424_DC_LOAD_DIAG_REP34:
 571         case TAS6424_DC_LOAD_DIAG_REPLO:
 572         case TAS6424_CHANNEL_STATE:
 573         case TAS6424_CHANNEL_FAULT:
 574         case TAS6424_GLOB_FAULT1:
 575         case TAS6424_GLOB_FAULT2:
 576         case TAS6424_WARN:
 577         case TAS6424_AC_LOAD_DIAG_REP1:
 578         case TAS6424_AC_LOAD_DIAG_REP2:
 579         case TAS6424_AC_LOAD_DIAG_REP3:
 580         case TAS6424_AC_LOAD_DIAG_REP4:
 581                 return true;
 582         default:
 583                 return false;
 584         }
 585 }
 586
 587 static const struct regmap_config tas6424_regmap_config = {
 588         .reg_bits = 8,
 589         .val_bits = 8,
 590
 591         .writeable_reg = tas6424_is_writable_reg,
 592         .volatile_reg = tas6424_is_volatile_reg,
 593
 594         .max_register = TAS6424_MAX,
 595         .reg_defaults = tas6424_reg_defaults,
 596         .num_reg_defaults = ARRAY_SIZE(tas6424_reg_defaults),
 597         .cache_type = REGCACHE_RBTREE,
 598 };
 599
 600 #if IS_ENABLED(CONFIG_OF)
 601 static const struct of_device_id tas6424_of_ids[] = {
 602         { .compatible = "ti,tas6424", },
 603         { },
 604 };
 605 MODULE_DEVICE_TABLE(of, tas6424_of_ids);
 606 #endif
 607
 608 static int tas6424_i2c_probe(struct i2c_client *client,
 609                              const struct i2c_device_id *id)
 610 {
 611         struct device *dev = &client->dev;
 612         struct tas6424_data *tas6424;
 613         int ret;
 614         int i;
 615
 616         tas6424 = devm_kzalloc(dev, sizeof(*tas6424), GFP_KERNEL);
 617         if (!tas6424)
 618                 return -ENOMEM;
 619         dev_set_drvdata(dev, tas6424);
 620
 621         tas6424->dev = dev;
 622
 623         tas6424->regmap = devm_regmap_init_i2c(client, &tas6424_regmap_config);
 624         if (IS_ERR(tas6424->regmap)) {
 625                 ret = PTR_ERR(tas6424->regmap);
 626                 dev_err(dev, "unable to allocate register map: %d\n", ret);
 627                 return ret;
 628         }
 629
 630         for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)
 631                 tas6424->supplies[i].supply = tas6424_supply_names[i];
 632         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),
 633                                       tas6424->supplies);
 634         if (ret) {
 635                 dev_err(dev, "unable to request supplies: %d\n", ret);
 636                 return ret;
 637         }
 638
 639         ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
 640                                     tas6424->supplies);
 641         if (ret) {
 642                 dev_err(dev, "unable to enable supplies: %d\n", ret);
 643                 return ret;
 644         }
 645
 646         /* Reset device to establish well-defined startup state */
 647         ret = regmap_update_bits(tas6424->regmap, TAS6424_MODE_CTRL,
 648                                  TAS6424_RESET, TAS6424_RESET);
 649         if (ret) {
 650                 dev_err(dev, "unable to reset device: %d\n", ret);
 651                 return ret;
 652         }
 653
 654         INIT_DELAYED_WORK(&tas6424->fault_check_work, tas6424_fault_check_work);
 655
 656         ret = devm_snd_soc_register_component(dev, &soc_codec_dev_tas6424,
 657                                      tas6424_dai, ARRAY_SIZE(tas6424_dai));
 658         if (ret < 0) {
 659                 dev_err(dev, "unable to register codec: %d\n", ret);
 660                 return ret;
 661         }
 662
 663         return 0;
 664 }
 665
 666 static int tas6424_i2c_remove(struct i2c_client *client)
 667 {
 668         struct device *dev = &client->dev;
 669         struct tas6424_data *tas6424 = dev_get_drvdata(dev);
 670         int ret;
 671
 672         cancel_delayed_work_sync(&tas6424->fault_check_work);
 673
 674         ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
 675                                      tas6424->supplies);
 676         if (ret < 0) {
 677                 dev_err(dev, "unable to disable supplies: %d\n", ret);
 678                 return ret;
 679         }
 680
 681         return 0;
 682 }
 683
 684 static const struct i2c_device_id tas6424_i2c_ids[] = {
 685         { "tas6424", 0 },
 686         { }
 687 };
 688 MODULE_DEVICE_TABLE(i2c, tas6424_i2c_ids);
 689
 690 static struct i2c_driver tas6424_i2c_driver = {
 691         .driver = {
 692                 .name = "tas6424",
 693                 .of_match_table = of_match_ptr(tas6424_of_ids),
 694         },
 695         .probe = tas6424_i2c_probe,
 696         .remove = tas6424_i2c_remove,
 697         .id_table = tas6424_i2c_ids,
 698 };
 699 module_i2c_driver(tas6424_i2c_driver);
 700
 701 MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");
 702 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 703 MODULE_DESCRIPTION("TAS6424 Audio amplifier driver");
 704 MODULE_LICENSE("GPL v2");