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, ®_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, ®); 410 if (ret < 0) { 411 dev_err(dev, "failed to read 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, ®); 455 if (ret < 0) { 456 dev_err(dev, "failed to read 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, ®); 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 faults 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"); 777