1 /* 2 * wm8741.c -- WM8741 ALSA SoC Audio driver 3 * 4 * Copyright 2010-1 Wolfson Microelectronics plc 5 * 6 * Author: Ian Lartey <ian@opensource.wolfsonmicro.com> 7 * 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/delay.h> 18 #include <linux/pm.h> 19 #include <linux/i2c.h> 20 #include <linux/spi/spi.h> 21 #include <linux/regmap.h> 22 #include <linux/regulator/consumer.h> 23 #include <linux/slab.h> 24 #include <linux/of_device.h> 25 #include <sound/core.h> 26 #include <sound/pcm.h> 27 #include <sound/pcm_params.h> 28 #include <sound/soc.h> 29 #include <sound/initval.h> 30 #include <sound/tlv.h> 31 32 #include "wm8741.h" 33 34 #define WM8741_NUM_SUPPLIES 2 35 static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = { 36 "AVDD", 37 "DVDD", 38 }; 39 40 #define WM8741_NUM_RATES 6 41 42 /* codec private data */ 43 struct wm8741_priv { 44 struct regmap *regmap; 45 struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES]; 46 unsigned int sysclk; 47 const struct snd_pcm_hw_constraint_list *sysclk_constraints; 48 }; 49 50 static const struct reg_default wm8741_reg_defaults[] = { 51 { 0, 0x0000 }, /* R0 - DACLLSB Attenuation */ 52 { 1, 0x0000 }, /* R1 - DACLMSB Attenuation */ 53 { 2, 0x0000 }, /* R2 - DACRLSB Attenuation */ 54 { 3, 0x0000 }, /* R3 - DACRMSB Attenuation */ 55 { 4, 0x0000 }, /* R4 - Volume Control */ 56 { 5, 0x000A }, /* R5 - Format Control */ 57 { 6, 0x0000 }, /* R6 - Filter Control */ 58 { 7, 0x0000 }, /* R7 - Mode Control 1 */ 59 { 8, 0x0002 }, /* R8 - Mode Control 2 */ 60 { 32, 0x0002 }, /* R32 - ADDITONAL_CONTROL_1 */ 61 }; 62 63 static bool wm8741_readable(struct device *dev, unsigned int reg) 64 { 65 switch (reg) { 66 case WM8741_DACLLSB_ATTENUATION: 67 case WM8741_DACLMSB_ATTENUATION: 68 case WM8741_DACRLSB_ATTENUATION: 69 case WM8741_DACRMSB_ATTENUATION: 70 case WM8741_VOLUME_CONTROL: 71 case WM8741_FORMAT_CONTROL: 72 case WM8741_FILTER_CONTROL: 73 case WM8741_MODE_CONTROL_1: 74 case WM8741_MODE_CONTROL_2: 75 case WM8741_ADDITIONAL_CONTROL_1: 76 return true; 77 default: 78 return false; 79 } 80 } 81 82 static int wm8741_reset(struct snd_soc_codec *codec) 83 { 84 return snd_soc_write(codec, WM8741_RESET, 0); 85 } 86 87 static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0); 88 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0); 89 90 static const struct snd_kcontrol_new wm8741_snd_controls[] = { 91 SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION, 92 WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine), 93 SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION, 94 WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv), 95 }; 96 97 static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = { 98 SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0), 99 SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0), 100 SND_SOC_DAPM_OUTPUT("VOUTLP"), 101 SND_SOC_DAPM_OUTPUT("VOUTLN"), 102 SND_SOC_DAPM_OUTPUT("VOUTRP"), 103 SND_SOC_DAPM_OUTPUT("VOUTRN"), 104 }; 105 106 static const struct snd_soc_dapm_route wm8741_dapm_routes[] = { 107 { "VOUTLP", NULL, "DACL" }, 108 { "VOUTLN", NULL, "DACL" }, 109 { "VOUTRP", NULL, "DACR" }, 110 { "VOUTRN", NULL, "DACR" }, 111 }; 112 113 static struct { 114 int value; 115 int ratio; 116 } lrclk_ratios[WM8741_NUM_RATES] = { 117 { 1, 128 }, 118 { 2, 192 }, 119 { 3, 256 }, 120 { 4, 384 }, 121 { 5, 512 }, 122 { 6, 768 }, 123 }; 124 125 static const unsigned int rates_11289[] = { 126 44100, 88235, 127 }; 128 129 static const struct snd_pcm_hw_constraint_list constraints_11289 = { 130 .count = ARRAY_SIZE(rates_11289), 131 .list = rates_11289, 132 }; 133 134 static const unsigned int rates_12288[] = { 135 32000, 48000, 96000, 136 }; 137 138 static const struct snd_pcm_hw_constraint_list constraints_12288 = { 139 .count = ARRAY_SIZE(rates_12288), 140 .list = rates_12288, 141 }; 142 143 static const unsigned int rates_16384[] = { 144 32000, 145 }; 146 147 static const struct snd_pcm_hw_constraint_list constraints_16384 = { 148 .count = ARRAY_SIZE(rates_16384), 149 .list = rates_16384, 150 }; 151 152 static const unsigned int rates_16934[] = { 153 44100, 88235, 154 }; 155 156 static const struct snd_pcm_hw_constraint_list constraints_16934 = { 157 .count = ARRAY_SIZE(rates_16934), 158 .list = rates_16934, 159 }; 160 161 static const unsigned int rates_18432[] = { 162 48000, 96000, 163 }; 164 165 static const struct snd_pcm_hw_constraint_list constraints_18432 = { 166 .count = ARRAY_SIZE(rates_18432), 167 .list = rates_18432, 168 }; 169 170 static const unsigned int rates_22579[] = { 171 44100, 88235, 1764000 172 }; 173 174 static const struct snd_pcm_hw_constraint_list constraints_22579 = { 175 .count = ARRAY_SIZE(rates_22579), 176 .list = rates_22579, 177 }; 178 179 static const unsigned int rates_24576[] = { 180 32000, 48000, 96000, 192000 181 }; 182 183 static const struct snd_pcm_hw_constraint_list constraints_24576 = { 184 .count = ARRAY_SIZE(rates_24576), 185 .list = rates_24576, 186 }; 187 188 static const unsigned int rates_36864[] = { 189 48000, 96000, 19200 190 }; 191 192 static const struct snd_pcm_hw_constraint_list constraints_36864 = { 193 .count = ARRAY_SIZE(rates_36864), 194 .list = rates_36864, 195 }; 196 197 198 static int wm8741_startup(struct snd_pcm_substream *substream, 199 struct snd_soc_dai *dai) 200 { 201 struct snd_soc_codec *codec = dai->codec; 202 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); 203 204 /* The set of sample rates that can be supported depends on the 205 * MCLK supplied to the CODEC - enforce this. 206 */ 207 if (!wm8741->sysclk) { 208 dev_err(codec->dev, 209 "No MCLK configured, call set_sysclk() on init\n"); 210 return -EINVAL; 211 } 212 213 snd_pcm_hw_constraint_list(substream->runtime, 0, 214 SNDRV_PCM_HW_PARAM_RATE, 215 wm8741->sysclk_constraints); 216 217 return 0; 218 } 219 220 static int wm8741_hw_params(struct snd_pcm_substream *substream, 221 struct snd_pcm_hw_params *params, 222 struct snd_soc_dai *dai) 223 { 224 struct snd_soc_codec *codec = dai->codec; 225 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); 226 u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC; 227 int i; 228 229 /* Find a supported LRCLK ratio */ 230 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { 231 if (wm8741->sysclk / params_rate(params) == 232 lrclk_ratios[i].ratio) 233 break; 234 } 235 236 /* Should never happen, should be handled by constraints */ 237 if (i == ARRAY_SIZE(lrclk_ratios)) { 238 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n", 239 wm8741->sysclk / params_rate(params)); 240 return -EINVAL; 241 } 242 243 /* bit size */ 244 switch (params_width(params)) { 245 case 16: 246 break; 247 case 20: 248 iface |= 0x0001; 249 break; 250 case 24: 251 iface |= 0x0002; 252 break; 253 case 32: 254 iface |= 0x0003; 255 break; 256 default: 257 dev_dbg(codec->dev, "wm8741_hw_params: Unsupported bit size param = %d", 258 params_width(params)); 259 return -EINVAL; 260 } 261 262 dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d", 263 params_width(params)); 264 265 snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface); 266 return 0; 267 } 268 269 static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai, 270 int clk_id, unsigned int freq, int dir) 271 { 272 struct snd_soc_codec *codec = codec_dai->codec; 273 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); 274 275 dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq); 276 277 switch (freq) { 278 case 11289600: 279 wm8741->sysclk_constraints = &constraints_11289; 280 wm8741->sysclk = freq; 281 return 0; 282 283 case 12288000: 284 wm8741->sysclk_constraints = &constraints_12288; 285 wm8741->sysclk = freq; 286 return 0; 287 288 case 16384000: 289 wm8741->sysclk_constraints = &constraints_16384; 290 wm8741->sysclk = freq; 291 return 0; 292 293 case 16934400: 294 wm8741->sysclk_constraints = &constraints_16934; 295 wm8741->sysclk = freq; 296 return 0; 297 298 case 18432000: 299 wm8741->sysclk_constraints = &constraints_18432; 300 wm8741->sysclk = freq; 301 return 0; 302 303 case 22579200: 304 case 33868800: 305 wm8741->sysclk_constraints = &constraints_22579; 306 wm8741->sysclk = freq; 307 return 0; 308 309 case 24576000: 310 wm8741->sysclk_constraints = &constraints_24576; 311 wm8741->sysclk = freq; 312 return 0; 313 314 case 36864000: 315 wm8741->sysclk_constraints = &constraints_36864; 316 wm8741->sysclk = freq; 317 return 0; 318 } 319 return -EINVAL; 320 } 321 322 static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai, 323 unsigned int fmt) 324 { 325 struct snd_soc_codec *codec = codec_dai->codec; 326 u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1C3; 327 328 /* check master/slave audio interface */ 329 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 330 case SND_SOC_DAIFMT_CBS_CFS: 331 break; 332 default: 333 return -EINVAL; 334 } 335 336 /* interface format */ 337 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 338 case SND_SOC_DAIFMT_I2S: 339 iface |= 0x0008; 340 break; 341 case SND_SOC_DAIFMT_RIGHT_J: 342 break; 343 case SND_SOC_DAIFMT_LEFT_J: 344 iface |= 0x0004; 345 break; 346 case SND_SOC_DAIFMT_DSP_A: 347 iface |= 0x000C; 348 break; 349 case SND_SOC_DAIFMT_DSP_B: 350 iface |= 0x001C; 351 break; 352 default: 353 return -EINVAL; 354 } 355 356 /* clock inversion */ 357 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 358 case SND_SOC_DAIFMT_NB_NF: 359 break; 360 case SND_SOC_DAIFMT_IB_IF: 361 iface |= 0x0010; 362 break; 363 case SND_SOC_DAIFMT_IB_NF: 364 iface |= 0x0020; 365 break; 366 case SND_SOC_DAIFMT_NB_IF: 367 iface |= 0x0030; 368 break; 369 default: 370 return -EINVAL; 371 } 372 373 374 dev_dbg(codec->dev, "wm8741_set_dai_fmt: Format=%x, Clock Inv=%x\n", 375 fmt & SND_SOC_DAIFMT_FORMAT_MASK, 376 ((fmt & SND_SOC_DAIFMT_INV_MASK))); 377 378 snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface); 379 return 0; 380 } 381 382 #define WM8741_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ 383 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \ 384 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \ 385 SNDRV_PCM_RATE_192000) 386 387 #define WM8741_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 388 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) 389 390 static const struct snd_soc_dai_ops wm8741_dai_ops = { 391 .startup = wm8741_startup, 392 .hw_params = wm8741_hw_params, 393 .set_sysclk = wm8741_set_dai_sysclk, 394 .set_fmt = wm8741_set_dai_fmt, 395 }; 396 397 static struct snd_soc_dai_driver wm8741_dai = { 398 .name = "wm8741", 399 .playback = { 400 .stream_name = "Playback", 401 .channels_min = 2, /* Mono modes not yet supported */ 402 .channels_max = 2, 403 .rates = WM8741_RATES, 404 .formats = WM8741_FORMATS, 405 }, 406 .ops = &wm8741_dai_ops, 407 }; 408 409 #ifdef CONFIG_PM 410 static int wm8741_resume(struct snd_soc_codec *codec) 411 { 412 snd_soc_cache_sync(codec); 413 return 0; 414 } 415 #else 416 #define wm8741_resume NULL 417 #endif 418 419 static int wm8741_probe(struct snd_soc_codec *codec) 420 { 421 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); 422 int ret = 0; 423 424 ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies), 425 wm8741->supplies); 426 if (ret != 0) { 427 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); 428 goto err_get; 429 } 430 431 ret = wm8741_reset(codec); 432 if (ret < 0) { 433 dev_err(codec->dev, "Failed to issue reset\n"); 434 goto err_enable; 435 } 436 437 /* Change some default settings - latch VU */ 438 snd_soc_update_bits(codec, WM8741_DACLLSB_ATTENUATION, 439 WM8741_UPDATELL, WM8741_UPDATELL); 440 snd_soc_update_bits(codec, WM8741_DACLMSB_ATTENUATION, 441 WM8741_UPDATELM, WM8741_UPDATELM); 442 snd_soc_update_bits(codec, WM8741_DACRLSB_ATTENUATION, 443 WM8741_UPDATERL, WM8741_UPDATERL); 444 snd_soc_update_bits(codec, WM8741_DACRMSB_ATTENUATION, 445 WM8741_UPDATERM, WM8741_UPDATERM); 446 447 dev_dbg(codec->dev, "Successful registration\n"); 448 return ret; 449 450 err_enable: 451 regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies); 452 err_get: 453 return ret; 454 } 455 456 static int wm8741_remove(struct snd_soc_codec *codec) 457 { 458 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); 459 460 regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies); 461 462 return 0; 463 } 464 465 static struct snd_soc_codec_driver soc_codec_dev_wm8741 = { 466 .probe = wm8741_probe, 467 .remove = wm8741_remove, 468 .resume = wm8741_resume, 469 470 .controls = wm8741_snd_controls, 471 .num_controls = ARRAY_SIZE(wm8741_snd_controls), 472 .dapm_widgets = wm8741_dapm_widgets, 473 .num_dapm_widgets = ARRAY_SIZE(wm8741_dapm_widgets), 474 .dapm_routes = wm8741_dapm_routes, 475 .num_dapm_routes = ARRAY_SIZE(wm8741_dapm_routes), 476 }; 477 478 static const struct of_device_id wm8741_of_match[] = { 479 { .compatible = "wlf,wm8741", }, 480 { } 481 }; 482 MODULE_DEVICE_TABLE(of, wm8741_of_match); 483 484 static const struct regmap_config wm8741_regmap = { 485 .reg_bits = 7, 486 .val_bits = 9, 487 .max_register = WM8741_MAX_REGISTER, 488 489 .reg_defaults = wm8741_reg_defaults, 490 .num_reg_defaults = ARRAY_SIZE(wm8741_reg_defaults), 491 .cache_type = REGCACHE_RBTREE, 492 493 .readable_reg = wm8741_readable, 494 }; 495 496 #if IS_ENABLED(CONFIG_I2C) 497 static int wm8741_i2c_probe(struct i2c_client *i2c, 498 const struct i2c_device_id *id) 499 { 500 struct wm8741_priv *wm8741; 501 int ret, i; 502 503 wm8741 = devm_kzalloc(&i2c->dev, sizeof(struct wm8741_priv), 504 GFP_KERNEL); 505 if (wm8741 == NULL) 506 return -ENOMEM; 507 508 for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++) 509 wm8741->supplies[i].supply = wm8741_supply_names[i]; 510 511 ret = devm_regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8741->supplies), 512 wm8741->supplies); 513 if (ret != 0) { 514 dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret); 515 return ret; 516 } 517 518 wm8741->regmap = devm_regmap_init_i2c(i2c, &wm8741_regmap); 519 if (IS_ERR(wm8741->regmap)) { 520 ret = PTR_ERR(wm8741->regmap); 521 dev_err(&i2c->dev, "Failed to init regmap: %d\n", ret); 522 return ret; 523 } 524 525 i2c_set_clientdata(i2c, wm8741); 526 527 ret = snd_soc_register_codec(&i2c->dev, 528 &soc_codec_dev_wm8741, &wm8741_dai, 1); 529 530 return ret; 531 } 532 533 static int wm8741_i2c_remove(struct i2c_client *client) 534 { 535 snd_soc_unregister_codec(&client->dev); 536 return 0; 537 } 538 539 static const struct i2c_device_id wm8741_i2c_id[] = { 540 { "wm8741", 0 }, 541 { } 542 }; 543 MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id); 544 545 static struct i2c_driver wm8741_i2c_driver = { 546 .driver = { 547 .name = "wm8741", 548 .owner = THIS_MODULE, 549 .of_match_table = wm8741_of_match, 550 }, 551 .probe = wm8741_i2c_probe, 552 .remove = wm8741_i2c_remove, 553 .id_table = wm8741_i2c_id, 554 }; 555 #endif 556 557 #if defined(CONFIG_SPI_MASTER) 558 static int wm8741_spi_probe(struct spi_device *spi) 559 { 560 struct wm8741_priv *wm8741; 561 int ret, i; 562 563 wm8741 = devm_kzalloc(&spi->dev, sizeof(struct wm8741_priv), 564 GFP_KERNEL); 565 if (wm8741 == NULL) 566 return -ENOMEM; 567 568 for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++) 569 wm8741->supplies[i].supply = wm8741_supply_names[i]; 570 571 ret = devm_regulator_bulk_get(&spi->dev, ARRAY_SIZE(wm8741->supplies), 572 wm8741->supplies); 573 if (ret != 0) { 574 dev_err(&spi->dev, "Failed to request supplies: %d\n", ret); 575 return ret; 576 } 577 578 wm8741->regmap = devm_regmap_init_spi(spi, &wm8741_regmap); 579 if (IS_ERR(wm8741->regmap)) { 580 ret = PTR_ERR(wm8741->regmap); 581 dev_err(&spi->dev, "Failed to init regmap: %d\n", ret); 582 return ret; 583 } 584 585 spi_set_drvdata(spi, wm8741); 586 587 ret = snd_soc_register_codec(&spi->dev, 588 &soc_codec_dev_wm8741, &wm8741_dai, 1); 589 return ret; 590 } 591 592 static int wm8741_spi_remove(struct spi_device *spi) 593 { 594 snd_soc_unregister_codec(&spi->dev); 595 return 0; 596 } 597 598 static struct spi_driver wm8741_spi_driver = { 599 .driver = { 600 .name = "wm8741", 601 .owner = THIS_MODULE, 602 .of_match_table = wm8741_of_match, 603 }, 604 .probe = wm8741_spi_probe, 605 .remove = wm8741_spi_remove, 606 }; 607 #endif /* CONFIG_SPI_MASTER */ 608 609 static int __init wm8741_modinit(void) 610 { 611 int ret = 0; 612 613 #if IS_ENABLED(CONFIG_I2C) 614 ret = i2c_add_driver(&wm8741_i2c_driver); 615 if (ret != 0) 616 pr_err("Failed to register WM8741 I2C driver: %d\n", ret); 617 #endif 618 #if defined(CONFIG_SPI_MASTER) 619 ret = spi_register_driver(&wm8741_spi_driver); 620 if (ret != 0) { 621 printk(KERN_ERR "Failed to register wm8741 SPI driver: %d\n", 622 ret); 623 } 624 #endif 625 626 return ret; 627 } 628 module_init(wm8741_modinit); 629 630 static void __exit wm8741_exit(void) 631 { 632 #if defined(CONFIG_SPI_MASTER) 633 spi_unregister_driver(&wm8741_spi_driver); 634 #endif 635 #if IS_ENABLED(CONFIG_I2C) 636 i2c_del_driver(&wm8741_i2c_driver); 637 #endif 638 } 639 module_exit(wm8741_exit); 640 641 MODULE_DESCRIPTION("ASoC WM8741 driver"); 642 MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>"); 643 MODULE_LICENSE("GPL"); 644