root/sound/soc/codecs/tas5720.c

DEFINITIONS

1. tas5720_hw_params
2. tas5720_set_dai_fmt
3. tas5720_set_dai_tdm_slot
4. tas5720_mute
5. tas5720_fault_check_work
6. tas5720_codec_probe
7. tas5720_codec_remove
8. tas5720_dac_event
9. tas5720_suspend
10. tas5720_resume
11. tas5720_is_volatile_reg
12. tas5722_volume_get
13. tas5722_volume_set
14. tas5720_probe

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * tas5720.c - ALSA SoC Texas Instruments TAS5720 Mono Audio Amplifier
   4  *
   5  * Copyright (C)2015-2016 Texas Instruments Incorporated -  http://www.ti.com
   6  *
   7  * Author: Andreas Dannenberg <dannenberg@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 "tas5720.h"
  27 
  28 /* Define how often to check (and clear) the fault status register (in ms) */
  29 #define TAS5720_FAULT_CHECK_INTERVAL            200
  30 
  31 enum tas572x_type {
  32         TAS5720,
  33         TAS5722,
  34 };
  35 
  36 static const char * const tas5720_supply_names[] = {
  37         "dvdd",         /* Digital power supply. Connect to 3.3-V supply. */
  38         "pvdd",         /* Class-D amp and analog power supply (connected). */
  39 };
  40 
  41 #define TAS5720_NUM_SUPPLIES    ARRAY_SIZE(tas5720_supply_names)
  42 
  43 struct tas5720_data {
  44         struct snd_soc_component *component;
  45         struct regmap *regmap;
  46         struct i2c_client *tas5720_client;
  47         enum tas572x_type devtype;
  48         struct regulator_bulk_data supplies[TAS5720_NUM_SUPPLIES];
  49         struct delayed_work fault_check_work;
  50         unsigned int last_fault;
  51 };
  52 
  53 static int tas5720_hw_params(struct snd_pcm_substream *substream,
  54                              struct snd_pcm_hw_params *params,
  55                              struct snd_soc_dai *dai)
  56 {
  57         struct snd_soc_component *component = dai->component;
  58         unsigned int rate = params_rate(params);
  59         bool ssz_ds;
  60         int ret;
  61 
  62         switch (rate) {
  63         case 44100:
  64         case 48000:
  65                 ssz_ds = false;
  66                 break;
  67         case 88200:
  68         case 96000:
  69                 ssz_ds = true;
  70                 break;
  71         default:
  72                 dev_err(component->dev, "unsupported sample rate: %u\n", rate);
  73                 return -EINVAL;
  74         }
  75 
  76         ret = snd_soc_component_update_bits(component, TAS5720_DIGITAL_CTRL1_REG,
  77                                   TAS5720_SSZ_DS, ssz_ds);
  78         if (ret < 0) {
  79                 dev_err(component->dev, "error setting sample rate: %d\n", ret);
  80                 return ret;
  81         }
  82 
  83         return 0;
  84 }
  85 
  86 static int tas5720_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
  87 {
  88         struct snd_soc_component *component = dai->component;
  89         u8 serial_format;
  90         int ret;
  91 
  92         if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
  93                 dev_vdbg(component->dev, "DAI Format master is not found\n");
  94                 return -EINVAL;
  95         }
  96 
  97         switch (fmt & (SND_SOC_DAIFMT_FORMAT_MASK |
  98                        SND_SOC_DAIFMT_INV_MASK)) {
  99         case (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF):
 100                 /* 1st data bit occur one BCLK cycle after the frame sync */
 101                 serial_format = TAS5720_SAIF_I2S;
 102                 break;
 103         case (SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF):
 104                 /*
 105                  * Note that although the TAS5720 does not have a dedicated DSP
 106                  * mode it doesn't care about the LRCLK duty cycle during TDM
 107                  * operation. Therefore we can use the device's I2S mode with
 108                  * its delaying of the 1st data bit to receive DSP_A formatted
 109                  * data. See device datasheet for additional details.
 110                  */
 111                 serial_format = TAS5720_SAIF_I2S;
 112                 break;
 113         case (SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF):
 114                 /*
 115                  * Similar to DSP_A, we can use the fact that the TAS5720 does
 116                  * not care about the LRCLK duty cycle during TDM to receive
 117                  * DSP_B formatted data in LEFTJ mode (no delaying of the 1st
 118                  * data bit).
 119                  */
 120                 serial_format = TAS5720_SAIF_LEFTJ;
 121                 break;
 122         case (SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF):
 123                 /* No delay after the frame sync */
 124                 serial_format = TAS5720_SAIF_LEFTJ;
 125                 break;
 126         default:
 127                 dev_vdbg(component->dev, "DAI Format is not found\n");
 128                 return -EINVAL;
 129         }
 130 
 131         ret = snd_soc_component_update_bits(component, TAS5720_DIGITAL_CTRL1_REG,
 132                                   TAS5720_SAIF_FORMAT_MASK,
 133                                   serial_format);
 134         if (ret < 0) {
 135                 dev_err(component->dev, "error setting SAIF format: %d\n", ret);
 136                 return ret;
 137         }
 138 
 139         return 0;
 140 }
 141 
 142 static int tas5720_set_dai_tdm_slot(struct snd_soc_dai *dai,
 143                                     unsigned int tx_mask, unsigned int rx_mask,
 144                                     int slots, int slot_width)
 145 {
 146         struct snd_soc_component *component = dai->component;
 147         struct tas5720_data *tas5720 = snd_soc_component_get_drvdata(component);
 148         unsigned int first_slot;
 149         int ret;
 150 
 151         if (!tx_mask) {
 152                 dev_err(component->dev, "tx masks must not be 0\n");
 153                 return -EINVAL;
 154         }
 155 
 156         /*
 157          * Determine the first slot that is being requested. We will only
 158          * use the first slot that is found since the TAS5720 is a mono
 159          * amplifier.
 160          */
 161         first_slot = __ffs(tx_mask);
 162 
 163         if (first_slot > 7) {
 164                 dev_err(component->dev, "slot selection out of bounds (%u)\n",
 165                         first_slot);
 166                 return -EINVAL;
 167         }
 168 
 169         /* Enable manual TDM slot selection (instead of I2C ID based) */
 170         ret = snd_soc_component_update_bits(component, TAS5720_DIGITAL_CTRL1_REG,
 171                                   TAS5720_TDM_CFG_SRC, TAS5720_TDM_CFG_SRC);
 172         if (ret < 0)
 173                 goto error_snd_soc_component_update_bits;
 174 
 175         /* Configure the TDM slot to process audio from */
 176         ret = snd_soc_component_update_bits(component, TAS5720_DIGITAL_CTRL2_REG,
 177                                   TAS5720_TDM_SLOT_SEL_MASK, first_slot);
 178         if (ret < 0)
 179                 goto error_snd_soc_component_update_bits;
 180 
 181         /* Configure TDM slot width. This is only applicable to TAS5722. */
 182         switch (tas5720->devtype) {
 183         case TAS5722:
 184                 ret = snd_soc_component_update_bits(component, TAS5722_DIGITAL_CTRL2_REG,
 185                                                     TAS5722_TDM_SLOT_16B,
 186                                                     slot_width == 16 ?
 187                                                     TAS5722_TDM_SLOT_16B : 0);
 188                 if (ret < 0)
 189                         goto error_snd_soc_component_update_bits;
 190                 break;
 191         default:
 192                 break;
 193         }
 194 
 195         return 0;
 196 
 197 error_snd_soc_component_update_bits:
 198         dev_err(component->dev, "error configuring TDM mode: %d\n", ret);
 199         return ret;
 200 }
 201 
 202 static int tas5720_mute(struct snd_soc_dai *dai, int mute)
 203 {
 204         struct snd_soc_component *component = dai->component;
 205         int ret;
 206 
 207         ret = snd_soc_component_update_bits(component, TAS5720_DIGITAL_CTRL2_REG,
 208                                   TAS5720_MUTE, mute ? TAS5720_MUTE : 0);
 209         if (ret < 0) {
 210                 dev_err(component->dev, "error (un-)muting device: %d\n", ret);
 211                 return ret;
 212         }
 213 
 214         return 0;
 215 }
 216 
 217 static void tas5720_fault_check_work(struct work_struct *work)
 218 {
 219         struct tas5720_data *tas5720 = container_of(work, struct tas5720_data,
 220                         fault_check_work.work);
 221         struct device *dev = tas5720->component->dev;
 222         unsigned int curr_fault;
 223         int ret;
 224 
 225         ret = regmap_read(tas5720->regmap, TAS5720_FAULT_REG, &curr_fault);
 226         if (ret < 0) {
 227                 dev_err(dev, "failed to read FAULT register: %d\n", ret);
 228                 goto out;
 229         }
 230 
 231         /* Check/handle all errors except SAIF clock errors */
 232         curr_fault &= TAS5720_OCE | TAS5720_DCE | TAS5720_OTE;
 233 
 234         /*
 235          * Only flag errors once for a given occurrence. This is needed as
 236          * the TAS5720 will take time clearing the fault condition internally
 237          * during which we don't want to bombard the system with the same
 238          * error message over and over.
 239          */
 240         if ((curr_fault & TAS5720_OCE) && !(tas5720->last_fault & TAS5720_OCE))
 241                 dev_crit(dev, "experienced an over current hardware fault\n");
 242 
 243         if ((curr_fault & TAS5720_DCE) && !(tas5720->last_fault & TAS5720_DCE))
 244                 dev_crit(dev, "experienced a DC detection fault\n");
 245 
 246         if ((curr_fault & TAS5720_OTE) && !(tas5720->last_fault & TAS5720_OTE))
 247                 dev_crit(dev, "experienced an over temperature fault\n");
 248 
 249         /* Store current fault value so we can detect any changes next time */
 250         tas5720->last_fault = curr_fault;
 251 
 252         if (!curr_fault)
 253                 goto out;
 254 
 255         /*
 256          * Periodically toggle SDZ (shutdown bit) H->L->H to clear any latching
 257          * faults as long as a fault condition persists. Always going through
 258          * the full sequence no matter the first return value to minimizes
 259          * chances for the device to end up in shutdown mode.
 260          */
 261         ret = regmap_write_bits(tas5720->regmap, TAS5720_POWER_CTRL_REG,
 262                                 TAS5720_SDZ, 0);
 263         if (ret < 0)
 264                 dev_err(dev, "failed to write POWER_CTRL register: %d\n", ret);
 265 
 266         ret = regmap_write_bits(tas5720->regmap, TAS5720_POWER_CTRL_REG,
 267                                 TAS5720_SDZ, TAS5720_SDZ);
 268         if (ret < 0)
 269                 dev_err(dev, "failed to write POWER_CTRL register: %d\n", ret);
 270 
 271 out:
 272         /* Schedule the next fault check at the specified interval */
 273         schedule_delayed_work(&tas5720->fault_check_work,
 274                               msecs_to_jiffies(TAS5720_FAULT_CHECK_INTERVAL));
 275 }
 276 
 277 static int tas5720_codec_probe(struct snd_soc_component *component)
 278 {
 279         struct tas5720_data *tas5720 = snd_soc_component_get_drvdata(component);
 280         unsigned int device_id, expected_device_id;
 281         int ret;
 282 
 283         tas5720->component = component;
 284 
 285         ret = regulator_bulk_enable(ARRAY_SIZE(tas5720->supplies),
 286                                     tas5720->supplies);
 287         if (ret != 0) {
 288                 dev_err(component->dev, "failed to enable supplies: %d\n", ret);
 289                 return ret;
 290         }
 291 
 292         /*
 293          * Take a liberal approach to checking the device ID to allow the
 294          * driver to be used even if the device ID does not match, however
 295          * issue a warning if there is a mismatch.
 296          */
 297         ret = regmap_read(tas5720->regmap, TAS5720_DEVICE_ID_REG, &device_id);
 298         if (ret < 0) {
 299                 dev_err(component->dev, "failed to read device ID register: %d\n",
 300                         ret);
 301                 goto probe_fail;
 302         }
 303 
 304         switch (tas5720->devtype) {
 305         case TAS5720:
 306                 expected_device_id = TAS5720_DEVICE_ID;
 307                 break;
 308         case TAS5722:
 309                 expected_device_id = TAS5722_DEVICE_ID;
 310                 break;
 311         default:
 312                 dev_err(component->dev, "unexpected private driver data\n");
 313                 return -EINVAL;
 314         }
 315 
 316         if (device_id != expected_device_id)
 317                 dev_warn(component->dev, "wrong device ID. expected: %u read: %u\n",
 318                          expected_device_id, device_id);
 319 
 320         /* Set device to mute */
 321         ret = snd_soc_component_update_bits(component, TAS5720_DIGITAL_CTRL2_REG,
 322                                   TAS5720_MUTE, TAS5720_MUTE);
 323         if (ret < 0)
 324                 goto error_snd_soc_component_update_bits;
 325 
 326         /*
 327          * Enter shutdown mode - our default when not playing audio - to
 328          * minimize current consumption. On the TAS5720 there is no real down
 329          * side doing so as all device registers are preserved and the wakeup
 330          * of the codec is rather quick which we do using a dapm widget.
 331          */
 332         ret = snd_soc_component_update_bits(component, TAS5720_POWER_CTRL_REG,
 333                                   TAS5720_SDZ, 0);
 334         if (ret < 0)
 335                 goto error_snd_soc_component_update_bits;
 336 
 337         INIT_DELAYED_WORK(&tas5720->fault_check_work, tas5720_fault_check_work);
 338 
 339         return 0;
 340 
 341 error_snd_soc_component_update_bits:
 342         dev_err(component->dev, "error configuring device registers: %d\n", ret);
 343 
 344 probe_fail:
 345         regulator_bulk_disable(ARRAY_SIZE(tas5720->supplies),
 346                                tas5720->supplies);
 347         return ret;
 348 }
 349 
 350 static void tas5720_codec_remove(struct snd_soc_component *component)
 351 {
 352         struct tas5720_data *tas5720 = snd_soc_component_get_drvdata(component);
 353         int ret;
 354 
 355         cancel_delayed_work_sync(&tas5720->fault_check_work);
 356 
 357         ret = regulator_bulk_disable(ARRAY_SIZE(tas5720->supplies),
 358                                      tas5720->supplies);
 359         if (ret < 0)
 360                 dev_err(component->dev, "failed to disable supplies: %d\n", ret);
 361 };
 362 
 363 static int tas5720_dac_event(struct snd_soc_dapm_widget *w,
 364                              struct snd_kcontrol *kcontrol, int event)
 365 {
 366         struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
 367         struct tas5720_data *tas5720 = snd_soc_component_get_drvdata(component);
 368         int ret;
 369 
 370         if (event & SND_SOC_DAPM_POST_PMU) {
 371                 /* Take TAS5720 out of shutdown mode */
 372                 ret = snd_soc_component_update_bits(component, TAS5720_POWER_CTRL_REG,
 373                                           TAS5720_SDZ, TAS5720_SDZ);
 374                 if (ret < 0) {
 375                         dev_err(component->dev, "error waking component: %d\n", ret);
 376                         return ret;
 377                 }
 378 
 379                 /*
 380                  * Observe codec shutdown-to-active time. The datasheet only
 381                  * lists a nominal value however just use-it as-is without
 382                  * additional padding to minimize the delay introduced in
 383                  * starting to play audio (actually there is other setup done
 384                  * by the ASoC framework that will provide additional delays,
 385                  * so we should always be safe).
 386                  */
 387                 msleep(25);
 388 
 389                 /* Turn on TAS5720 periodic fault checking/handling */
 390                 tas5720->last_fault = 0;
 391                 schedule_delayed_work(&tas5720->fault_check_work,
 392                                 msecs_to_jiffies(TAS5720_FAULT_CHECK_INTERVAL));
 393         } else if (event & SND_SOC_DAPM_PRE_PMD) {
 394                 /* Disable TAS5720 periodic fault checking/handling */
 395                 cancel_delayed_work_sync(&tas5720->fault_check_work);
 396 
 397                 /* Place TAS5720 in shutdown mode to minimize current draw */
 398                 ret = snd_soc_component_update_bits(component, TAS5720_POWER_CTRL_REG,
 399                                           TAS5720_SDZ, 0);
 400                 if (ret < 0) {
 401                         dev_err(component->dev, "error shutting down component: %d\n",
 402                                 ret);
 403                         return ret;
 404                 }
 405         }
 406 
 407         return 0;
 408 }
 409 
 410 #ifdef CONFIG_PM
 411 static int tas5720_suspend(struct snd_soc_component *component)
 412 {
 413         struct tas5720_data *tas5720 = snd_soc_component_get_drvdata(component);
 414         int ret;
 415 
 416         regcache_cache_only(tas5720->regmap, true);
 417         regcache_mark_dirty(tas5720->regmap);
 418 
 419         ret = regulator_bulk_disable(ARRAY_SIZE(tas5720->supplies),
 420                                      tas5720->supplies);
 421         if (ret < 0)
 422                 dev_err(component->dev, "failed to disable supplies: %d\n", ret);
 423 
 424         return ret;
 425 }
 426 
 427 static int tas5720_resume(struct snd_soc_component *component)
 428 {
 429         struct tas5720_data *tas5720 = snd_soc_component_get_drvdata(component);
 430         int ret;
 431 
 432         ret = regulator_bulk_enable(ARRAY_SIZE(tas5720->supplies),
 433                                     tas5720->supplies);
 434         if (ret < 0) {
 435                 dev_err(component->dev, "failed to enable supplies: %d\n", ret);
 436                 return ret;
 437         }
 438 
 439         regcache_cache_only(tas5720->regmap, false);
 440 
 441         ret = regcache_sync(tas5720->regmap);
 442         if (ret < 0) {
 443                 dev_err(component->dev, "failed to sync regcache: %d\n", ret);
 444                 return ret;
 445         }
 446 
 447         return 0;
 448 }
 449 #else
 450 #define tas5720_suspend NULL
 451 #define tas5720_resume NULL
 452 #endif
 453 
 454 static bool tas5720_is_volatile_reg(struct device *dev, unsigned int reg)
 455 {
 456         switch (reg) {
 457         case TAS5720_DEVICE_ID_REG:
 458         case TAS5720_FAULT_REG:
 459                 return true;
 460         default:
 461                 return false;
 462         }
 463 }
 464 
 465 static const struct regmap_config tas5720_regmap_config = {
 466         .reg_bits = 8,
 467         .val_bits = 8,
 468 
 469         .max_register = TAS5720_MAX_REG,
 470         .cache_type = REGCACHE_RBTREE,
 471         .volatile_reg = tas5720_is_volatile_reg,
 472 };
 473 
 474 static const struct regmap_config tas5722_regmap_config = {
 475         .reg_bits = 8,
 476         .val_bits = 8,
 477 
 478         .max_register = TAS5722_MAX_REG,
 479         .cache_type = REGCACHE_RBTREE,
 480         .volatile_reg = tas5720_is_volatile_reg,
 481 };
 482 
 483 /*
 484  * DAC analog gain. There are four discrete values to select from, ranging
 485  * from 19.2 dB to 26.3dB.
 486  */
 487 static const DECLARE_TLV_DB_RANGE(dac_analog_tlv,
 488         0x0, 0x0, TLV_DB_SCALE_ITEM(1920, 0, 0),
 489         0x1, 0x1, TLV_DB_SCALE_ITEM(2070, 0, 0),
 490         0x2, 0x2, TLV_DB_SCALE_ITEM(2350, 0, 0),
 491         0x3, 0x3, TLV_DB_SCALE_ITEM(2630, 0, 0),
 492 );
 493 
 494 /*
 495  * DAC digital volumes. From -103.5 to 24 dB in 0.5 dB or 0.25 dB steps
 496  * depending on the device. Note that setting the gain below -100 dB
 497  * (register value <0x7) is effectively a MUTE as per device datasheet.
 498  *
 499  * Note that for the TAS5722 the digital volume controls are actually split
 500  * over two registers, so we need custom getters/setters for access.
 501  */
 502 static DECLARE_TLV_DB_SCALE(tas5720_dac_tlv, -10350, 50, 0);
 503 static DECLARE_TLV_DB_SCALE(tas5722_dac_tlv, -10350, 25, 0);
 504 
 505 static int tas5722_volume_get(struct snd_kcontrol *kcontrol,
 506                               struct snd_ctl_elem_value *ucontrol)
 507 {
 508         struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 509         unsigned int val;
 510 
 511         snd_soc_component_read(component, TAS5720_VOLUME_CTRL_REG, &val);
 512         ucontrol->value.integer.value[0] = val << 1;
 513 
 514         snd_soc_component_read(component, TAS5722_DIGITAL_CTRL2_REG, &val);
 515         ucontrol->value.integer.value[0] |= val & TAS5722_VOL_CONTROL_LSB;
 516 
 517         return 0;
 518 }
 519 
 520 static int tas5722_volume_set(struct snd_kcontrol *kcontrol,
 521                               struct snd_ctl_elem_value *ucontrol)
 522 {
 523         struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 524         unsigned int sel = ucontrol->value.integer.value[0];
 525 
 526         snd_soc_component_write(component, TAS5720_VOLUME_CTRL_REG, sel >> 1);
 527         snd_soc_component_update_bits(component, TAS5722_DIGITAL_CTRL2_REG,
 528                                       TAS5722_VOL_CONTROL_LSB, sel);
 529 
 530         return 0;
 531 }
 532 
 533 static const struct snd_kcontrol_new tas5720_snd_controls[] = {
 534         SOC_SINGLE_TLV("Speaker Driver Playback Volume",
 535                        TAS5720_VOLUME_CTRL_REG, 0, 0xff, 0, tas5720_dac_tlv),
 536         SOC_SINGLE_TLV("Speaker Driver Analog Gain", TAS5720_ANALOG_CTRL_REG,
 537                        TAS5720_ANALOG_GAIN_SHIFT, 3, 0, dac_analog_tlv),
 538 };
 539 
 540 static const struct snd_kcontrol_new tas5722_snd_controls[] = {
 541         SOC_SINGLE_EXT_TLV("Speaker Driver Playback Volume",
 542                            0, 0, 511, 0,
 543                            tas5722_volume_get, tas5722_volume_set,
 544                            tas5722_dac_tlv),
 545         SOC_SINGLE_TLV("Speaker Driver Analog Gain", TAS5720_ANALOG_CTRL_REG,
 546                        TAS5720_ANALOG_GAIN_SHIFT, 3, 0, dac_analog_tlv),
 547 };
 548 
 549 static const struct snd_soc_dapm_widget tas5720_dapm_widgets[] = {
 550         SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
 551         SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas5720_dac_event,
 552                            SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 553         SND_SOC_DAPM_OUTPUT("OUT")
 554 };
 555 
 556 static const struct snd_soc_dapm_route tas5720_audio_map[] = {
 557         { "DAC", NULL, "DAC IN" },
 558         { "OUT", NULL, "DAC" },
 559 };
 560 
 561 static const struct snd_soc_component_driver soc_component_dev_tas5720 = {
 562         .probe                  = tas5720_codec_probe,
 563         .remove                 = tas5720_codec_remove,
 564         .suspend                = tas5720_suspend,
 565         .resume                 = tas5720_resume,
 566         .controls               = tas5720_snd_controls,
 567         .num_controls           = ARRAY_SIZE(tas5720_snd_controls),
 568         .dapm_widgets           = tas5720_dapm_widgets,
 569         .num_dapm_widgets       = ARRAY_SIZE(tas5720_dapm_widgets),
 570         .dapm_routes            = tas5720_audio_map,
 571         .num_dapm_routes        = ARRAY_SIZE(tas5720_audio_map),
 572         .idle_bias_on           = 1,
 573         .use_pmdown_time        = 1,
 574         .endianness             = 1,
 575         .non_legacy_dai_naming  = 1,
 576 };
 577 
 578 static const struct snd_soc_component_driver soc_component_dev_tas5722 = {
 579         .probe = tas5720_codec_probe,
 580         .remove = tas5720_codec_remove,
 581         .suspend = tas5720_suspend,
 582         .resume = tas5720_resume,
 583         .controls = tas5722_snd_controls,
 584         .num_controls = ARRAY_SIZE(tas5722_snd_controls),
 585         .dapm_widgets = tas5720_dapm_widgets,
 586         .num_dapm_widgets = ARRAY_SIZE(tas5720_dapm_widgets),
 587         .dapm_routes = tas5720_audio_map,
 588         .num_dapm_routes = ARRAY_SIZE(tas5720_audio_map),
 589         .idle_bias_on           = 1,
 590         .use_pmdown_time        = 1,
 591         .endianness             = 1,
 592         .non_legacy_dai_naming  = 1,
 593 };
 594 
 595 /* PCM rates supported by the TAS5720 driver */
 596 #define TAS5720_RATES   (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
 597                          SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 598 
 599 /* Formats supported by TAS5720 driver */
 600 #define TAS5720_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S18_3LE |\
 601                          SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE)
 602 
 603 static const struct snd_soc_dai_ops tas5720_speaker_dai_ops = {
 604         .hw_params      = tas5720_hw_params,
 605         .set_fmt        = tas5720_set_dai_fmt,
 606         .set_tdm_slot   = tas5720_set_dai_tdm_slot,
 607         .digital_mute   = tas5720_mute,
 608 };
 609 
 610 /*
 611  * TAS5720 DAI structure
 612  *
 613  * Note that were are advertising .playback.channels_max = 2 despite this being
 614  * a mono amplifier. The reason for that is that some serial ports such as TI's
 615  * McASP module have a minimum number of channels (2) that they can output.
 616  * Advertising more channels than we have will allow us to interface with such
 617  * a serial port without really any negative side effects as the TAS5720 will
 618  * simply ignore any extra channel(s) asides from the one channel that is
 619  * configured to be played back.
 620  */
 621 static struct snd_soc_dai_driver tas5720_dai[] = {
 622         {
 623                 .name = "tas5720-amplifier",
 624                 .playback = {
 625                         .stream_name = "Playback",
 626                         .channels_min = 1,
 627                         .channels_max = 2,
 628                         .rates = TAS5720_RATES,
 629                         .formats = TAS5720_FORMATS,
 630                 },
 631                 .ops = &tas5720_speaker_dai_ops,
 632         },
 633 };
 634 
 635 static int tas5720_probe(struct i2c_client *client,
 636                          const struct i2c_device_id *id)
 637 {
 638         struct device *dev = &client->dev;
 639         struct tas5720_data *data;
 640         const struct regmap_config *regmap_config;
 641         int ret;
 642         int i;
 643 
 644         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 645         if (!data)
 646                 return -ENOMEM;
 647 
 648         data->tas5720_client = client;
 649         data->devtype = id->driver_data;
 650 
 651         switch (id->driver_data) {
 652         case TAS5720:
 653                 regmap_config = &tas5720_regmap_config;
 654                 break;
 655         case TAS5722:
 656                 regmap_config = &tas5722_regmap_config;
 657                 break;
 658         default:
 659                 dev_err(dev, "unexpected private driver data\n");
 660                 return -EINVAL;
 661         }
 662         data->regmap = devm_regmap_init_i2c(client, regmap_config);
 663         if (IS_ERR(data->regmap)) {
 664                 ret = PTR_ERR(data->regmap);
 665                 dev_err(dev, "failed to allocate register map: %d\n", ret);
 666                 return ret;
 667         }
 668 
 669         for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
 670                 data->supplies[i].supply = tas5720_supply_names[i];
 671 
 672         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
 673                                       data->supplies);
 674         if (ret != 0) {
 675                 dev_err(dev, "failed to request supplies: %d\n", ret);
 676                 return ret;
 677         }
 678 
 679         dev_set_drvdata(dev, data);
 680 
 681         switch (id->driver_data) {
 682         case TAS5720:
 683                 ret = devm_snd_soc_register_component(&client->dev,
 684                                         &soc_component_dev_tas5720,
 685                                         tas5720_dai,
 686                                         ARRAY_SIZE(tas5720_dai));
 687                 break;
 688         case TAS5722:
 689                 ret = devm_snd_soc_register_component(&client->dev,
 690                                         &soc_component_dev_tas5722,
 691                                         tas5720_dai,
 692                                         ARRAY_SIZE(tas5720_dai));
 693                 break;
 694         default:
 695                 dev_err(dev, "unexpected private driver data\n");
 696                 return -EINVAL;
 697         }
 698         if (ret < 0) {
 699                 dev_err(dev, "failed to register component: %d\n", ret);
 700                 return ret;
 701         }
 702 
 703         return 0;
 704 }
 705 
 706 static const struct i2c_device_id tas5720_id[] = {
 707         { "tas5720", TAS5720 },
 708         { "tas5722", TAS5722 },
 709         { }
 710 };
 711 MODULE_DEVICE_TABLE(i2c, tas5720_id);
 712 
 713 #if IS_ENABLED(CONFIG_OF)
 714 static const struct of_device_id tas5720_of_match[] = {
 715         { .compatible = "ti,tas5720", },
 716         { .compatible = "ti,tas5722", },
 717         { },
 718 };
 719 MODULE_DEVICE_TABLE(of, tas5720_of_match);
 720 #endif
 721 
 722 static struct i2c_driver tas5720_i2c_driver = {
 723         .driver = {
 724                 .name = "tas5720",
 725                 .of_match_table = of_match_ptr(tas5720_of_match),
 726         },
 727         .probe = tas5720_probe,
 728         .id_table = tas5720_id,
 729 };
 730 
 731 module_i2c_driver(tas5720_i2c_driver);
 732 
 733 MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");
 734 MODULE_DESCRIPTION("TAS5720 Audio amplifier driver");
 735 MODULE_LICENSE("GPL");