target/linux/brcm2708/patches-4.14/950-0081-Add-support-for-Allo-Boss-DAC-add-on-board-for-Raspb.patch

   1 From cbcb43856238e359086ac491f41d5d38b834268f Mon Sep 17 00:00:00 2001
   2 From: BabuSubashChandar <babuenir@gmail.com>
   3 Date: Tue, 28 Mar 2017 20:04:42 +0530
   4 Subject: [PATCH 081/454] Add support for Allo Boss DAC add-on board for
   5  Raspberry Pi. (#1924)
   6
   7 Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net>
   8 Reviewed-by: Deepak <deepak@zilogic.com>
   9 Reviewed-by: BabuSubashChandar <babusubashchandar@zilogic.com>
  10
  11 Add support for new clock rate and mute gpios.
  12
  13 Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net>
  14 Reviewed-by: Deepak <deepak@zilogic.com>
  15 Reviewed-by: BabuSubashChandar <babusubashchandar@zilogic.com>
  16 ---
  17  drivers/clk/Makefile          |   1 +
  18  drivers/clk/clk-allo-dac.c    | 161 ++++++++++++
  19  sound/soc/bcm/Kconfig         |   7 +
  20  sound/soc/bcm/Makefile        |   2 +
  21  sound/soc/bcm/allo-boss-dac.c | 461 ++++++++++++++++++++++++++++++++++
  22  5 files changed, 632 insertions(+)
  23  create mode 100644 drivers/clk/clk-allo-dac.c
  24  create mode 100644 sound/soc/bcm/allo-boss-dac.c
  25
  26 --- a/drivers/clk/Makefile
  27 +++ b/drivers/clk/Makefile
  28 @@ -18,6 +18,7 @@ endif
  29
  30  # hardware specific clock types
  31  # please keep this section sorted lexicographically by file path name
  32 +obj-$(CONFIG_SND_BCM2708_SOC_ALLO_BOSS_DAC)    += clk-allo-dac.o
  33  obj-$(CONFIG_MACH_ASM9260)             += clk-asm9260.o
  34  obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN)    += clk-axi-clkgen.o
  35  obj-$(CONFIG_ARCH_AXXIA)               += clk-axm5516.o
  36 --- /dev/null
  37 +++ b/drivers/clk/clk-allo-dac.c
  38 @@ -0,0 +1,161 @@
  39 +/*
  40 + * Clock Driver for Allo DAC
  41 + *
  42 + * Author:     Baswaraj K <jaikumar@cem-solutions.net>
  43 + *             Copyright 2016
  44 + *             based on code by Stuart MacLean
  45 + *
  46 + * This program is free software; you can redistribute it and/or
  47 + * modify it under the terms of the GNU General Public License
  48 + * version 2 as published by the Free Software Foundation.
  49 + *
  50 + * This program is distributed in the hope that it will be useful, but
  51 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  52 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  53 + * General Public License for more details.
  54 + */
  55 +
  56 +#include <linux/clk-provider.h>
  57 +#include <linux/clkdev.h>
  58 +#include <linux/kernel.h>
  59 +#include <linux/module.h>
  60 +#include <linux/of.h>
  61 +#include <linux/slab.h>
  62 +#include <linux/platform_device.h>
  63 +
  64 +/* Clock rate of CLK44EN attached to GPIO6 pin */
  65 +#define CLK_44EN_RATE 45158400UL
  66 +/* Clock rate of CLK48EN attached to GPIO3 pin */
  67 +#define CLK_48EN_RATE 49152000UL
  68 +
  69 +/**
  70 + * struct allo_dac_clk - Common struct to the Allo DAC
  71 + * @hw: clk_hw for the common clk framework
  72 + * @mode: 0 => CLK44EN, 1 => CLK48EN
  73 + */
  74 +struct clk_allo_hw {
  75 +       struct clk_hw hw;
  76 +       uint8_t mode;
  77 +};
  78 +
  79 +#define to_allo_clk(_hw) container_of(_hw, struct clk_allo_hw, hw)
  80 +
  81 +static const struct of_device_id clk_allo_dac_dt_ids[] = {
  82 +       { .compatible = "allo,dac-clk",},
  83 +       { }
  84 +};
  85 +MODULE_DEVICE_TABLE(of, clk_allo_dac_dt_ids);
  86 +
  87 +static unsigned long clk_allo_dac_recalc_rate(struct clk_hw *hw,
  88 +       unsigned long parent_rate)
  89 +{
  90 +       return (to_allo_clk(hw)->mode == 0) ? CLK_44EN_RATE :
  91 +               CLK_48EN_RATE;
  92 +}
  93 +
  94 +static long clk_allo_dac_round_rate(struct clk_hw *hw,
  95 +       unsigned long rate, unsigned long *parent_rate)
  96 +{
  97 +       long actual_rate;
  98 +
  99 +       if (rate <= CLK_44EN_RATE) {
 100 +               actual_rate = (long)CLK_44EN_RATE;
 101 +       } else if (rate >= CLK_48EN_RATE) {
 102 +               actual_rate = (long)CLK_48EN_RATE;
 103 +       } else {
 104 +               long diff44Rate = (long)(rate - CLK_44EN_RATE);
 105 +               long diff48Rate = (long)(CLK_48EN_RATE - rate);
 106 +
 107 +               if (diff44Rate < diff48Rate)
 108 +                       actual_rate = (long)CLK_44EN_RATE;
 109 +               else
 110 +                       actual_rate = (long)CLK_48EN_RATE;
 111 +       }
 112 +       return actual_rate;
 113 +}
 114 +
 115 +
 116 +static int clk_allo_dac_set_rate(struct clk_hw *hw,
 117 +       unsigned long rate, unsigned long parent_rate)
 118 +{
 119 +       unsigned long actual_rate;
 120 +       struct clk_allo_hw *clk = to_allo_clk(hw);
 121 +
 122 +       actual_rate = (unsigned long)clk_allo_dac_round_rate(hw, rate,
 123 +               &parent_rate);
 124 +       clk->mode = (actual_rate == CLK_44EN_RATE) ? 0 : 1;
 125 +       return 0;
 126 +}
 127 +
 128 +
 129 +const struct clk_ops clk_allo_dac_rate_ops = {
 130 +       .recalc_rate = clk_allo_dac_recalc_rate,
 131 +       .round_rate = clk_allo_dac_round_rate,
 132 +       .set_rate = clk_allo_dac_set_rate,
 133 +};
 134 +
 135 +static int clk_allo_dac_probe(struct platform_device *pdev)
 136 +{
 137 +       int ret;
 138 +       struct clk_allo_hw *proclk;
 139 +       struct clk *clk;
 140 +       struct device *dev;
 141 +       struct clk_init_data init;
 142 +
 143 +       dev = &pdev->dev;
 144 +
 145 +       proclk = kzalloc(sizeof(struct clk_allo_hw), GFP_KERNEL);
 146 +       if (!proclk)
 147 +               return -ENOMEM;
 148 +
 149 +       init.name = "clk-allo-dac";
 150 +       init.ops = &clk_allo_dac_rate_ops;
 151 +       init.flags = CLK_IS_BASIC;
 152 +       init.parent_names = NULL;
 153 +       init.num_parents = 0;
 154 +
 155 +       proclk->mode = 0;
 156 +       proclk->hw.init = &init;
 157 +
 158 +       clk = devm_clk_register(dev, &proclk->hw);
 159 +       if (!IS_ERR(clk)) {
 160 +               ret = of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
 161 +                       clk);
 162 +       } else {
 163 +               dev_err(dev, "Fail to register clock driver\n");
 164 +               kfree(proclk);
 165 +               ret = PTR_ERR(clk);
 166 +       }
 167 +       return ret;
 168 +}
 169 +
 170 +static int clk_allo_dac_remove(struct platform_device *pdev)
 171 +{
 172 +       of_clk_del_provider(pdev->dev.of_node);
 173 +       return 0;
 174 +}
 175 +
 176 +static struct platform_driver clk_allo_dac_driver = {
 177 +       .probe = clk_allo_dac_probe,
 178 +       .remove = clk_allo_dac_remove,
 179 +       .driver = {
 180 +               .name = "clk-allo-dac",
 181 +               .of_match_table = clk_allo_dac_dt_ids,
 182 +       },
 183 +};
 184 +
 185 +static int __init clk_allo_dac_init(void)
 186 +{
 187 +       return platform_driver_register(&clk_allo_dac_driver);
 188 +}
 189 +core_initcall(clk_allo_dac_init);
 190 +
 191 +static void __exit clk_allo_dac_exit(void)
 192 +{
 193 +       platform_driver_unregister(&clk_allo_dac_driver);
 194 +}
 195 +module_exit(clk_allo_dac_exit);
 196 +
 197 +MODULE_DESCRIPTION("Allo DAC clock driver");
 198 +MODULE_LICENSE("GPL v2");
 199 +MODULE_ALIAS("platform:clk-allo-dac");
 200 --- a/sound/soc/bcm/Kconfig
 201 +++ b/sound/soc/bcm/Kconfig
 202 @@ -138,3 +138,10 @@ config SND_BCM2708_SOC_ALLO_PIANO_DAC_PL
 203         select SND_SOC_PCM512x_I2C
 204         help
 205           Say Y or M if you want to add support for Allo Piano DAC Plus.
 206 +
 207 +config SND_BCM2708_SOC_ALLO_BOSS_DAC
 208 +       tristate "Support for Allo Boss DAC"
 209 +       depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
 210 +       select SND_SOC_PCM512x_I2C
 211 +       help
 212 +         Say Y or M if you want to add support for Allo Boss DAC.
 213 --- a/sound/soc/bcm/Makefile
 214 +++ b/sound/soc/bcm/Makefile
 215 @@ -24,6 +24,7 @@ snd-soc-raspidac3-objs := raspidac3.o
 216  snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
 217  snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
 218  snd-soc-dionaudio-loco-objs := dionaudio_loco.o
 219 +snd-soc-allo-boss-dac-objs := allo-boss-dac.o
 220  snd-soc-allo-piano-dac-objs := allo-piano-dac.o
 221  snd-soc-allo-piano-dac-plus-objs := allo-piano-dac-plus.o
 222
 223 @@ -42,5 +43,6 @@ obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3)
 224  obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
 225  obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
 226  obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO) += snd-soc-dionaudio-loco.o
 227 +obj-$(CONFIG_SND_BCM2708_SOC_ALLO_BOSS_DAC) += snd-soc-allo-boss-dac.o
 228  obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC) += snd-soc-allo-piano-dac.o
 229  obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC_PLUS) += snd-soc-allo-piano-dac-plus.o
 230 --- /dev/null
 231 +++ b/sound/soc/bcm/allo-boss-dac.c
 232 @@ -0,0 +1,461 @@
 233 +/*
 234 + * ALSA ASoC Machine Driver for Allo Boss DAC
 235 + *
 236 + * Author:     Baswaraj K <jaikumar@cem-solutions.net>
 237 + *             Copyright 2017
 238 + *             based on code by Daniel Matuschek,
 239 + *                              Stuart MacLean <stuart@hifiberry.com>
 240 + *             based on code by Florian Meier <florian.meier@koalo.de>
 241 + *
 242 + * This program is free software; you can redistribute it and/or
 243 + * modify it under the terms of the GNU General Public License
 244 + * version 2 as published by the Free Software Foundation.
 245 + *
 246 + * This program is distributed in the hope that it will be useful, but
 247 + * WITHOUT ANY WARRANTY; without even the implied warranty of
 248 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 249 + * General Public License for more details.
 250 + */
 251 +
 252 +#include <linux/module.h>
 253 +#include <linux/gpio/consumer.h>
 254 +#include <linux/platform_device.h>
 255 +#include <linux/clk.h>
 256 +#include <linux/delay.h>
 257 +
 258 +#include <sound/core.h>
 259 +#include <sound/pcm.h>
 260 +#include <sound/pcm_params.h>
 261 +#include <sound/soc.h>
 262 +#include "../codecs/pcm512x.h"
 263 +
 264 +#define ALLO_BOSS_NOCLOCK 0
 265 +#define ALLO_BOSS_CLK44EN 1
 266 +#define ALLO_BOSS_CLK48EN 2
 267 +
 268 +struct pcm512x_priv {
 269 +       struct regmap *regmap;
 270 +       struct clk *sclk;
 271 +};
 272 +
 273 +static struct gpio_desc *mute_gpio;
 274 +
 275 +/* Clock rate of CLK44EN attached to GPIO6 pin */
 276 +#define CLK_44EN_RATE 45158400UL
 277 +/* Clock rate of CLK48EN attached to GPIO3 pin */
 278 +#define CLK_48EN_RATE 49152000UL
 279 +
 280 +static bool slave;
 281 +static bool snd_soc_allo_boss_master;
 282 +static bool digital_gain_0db_limit = true;
 283 +
 284 +static void snd_allo_boss_select_clk(struct snd_soc_codec *codec,
 285 +       int clk_id)
 286 +{
 287 +       switch (clk_id) {
 288 +       case ALLO_BOSS_NOCLOCK:
 289 +               snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x24, 0x00);
 290 +               break;
 291 +       case ALLO_BOSS_CLK44EN:
 292 +               snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x24, 0x20);
 293 +               break;
 294 +       case ALLO_BOSS_CLK48EN:
 295 +               snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
 296 +               break;
 297 +       }
 298 +}
 299 +
 300 +static void snd_allo_boss_clk_gpio(struct snd_soc_codec *codec)
 301 +{
 302 +       snd_soc_update_bits(codec, PCM512x_GPIO_EN, 0x24, 0x24);
 303 +       snd_soc_update_bits(codec, PCM512x_GPIO_OUTPUT_3, 0x0f, 0x02);
 304 +       snd_soc_update_bits(codec, PCM512x_GPIO_OUTPUT_6, 0x0f, 0x02);
 305 +}
 306 +
 307 +static bool snd_allo_boss_is_sclk(struct snd_soc_codec *codec)
 308 +{
 309 +       int sck;
 310 +
 311 +       sck = snd_soc_read(codec, PCM512x_RATE_DET_4);
 312 +       return (!(sck & 0x40));
 313 +}
 314 +
 315 +static bool snd_allo_boss_is_sclk_sleep(
 316 +       struct snd_soc_codec *codec)
 317 +{
 318 +       msleep(2);
 319 +       return snd_allo_boss_is_sclk(codec);
 320 +}
 321 +
 322 +static bool snd_allo_boss_is_master_card(struct snd_soc_codec *codec)
 323 +{
 324 +       bool isClk44EN, isClk48En, isNoClk;
 325 +
 326 +       snd_allo_boss_clk_gpio(codec);
 327 +
 328 +       snd_allo_boss_select_clk(codec, ALLO_BOSS_CLK44EN);
 329 +       isClk44EN = snd_allo_boss_is_sclk_sleep(codec);
 330 +
 331 +       snd_allo_boss_select_clk(codec, ALLO_BOSS_NOCLOCK);
 332 +       isNoClk = snd_allo_boss_is_sclk_sleep(codec);
 333 +
 334 +       snd_allo_boss_select_clk(codec, ALLO_BOSS_CLK48EN);
 335 +       isClk48En = snd_allo_boss_is_sclk_sleep(codec);
 336 +
 337 +       return (isClk44EN && isClk48En && !isNoClk);
 338 +}
 339 +
 340 +static int snd_allo_boss_clk_for_rate(int sample_rate)
 341 +{
 342 +       int type;
 343 +
 344 +       switch (sample_rate) {
 345 +       case 11025:
 346 +       case 22050:
 347 +       case 44100:
 348 +       case 88200:
 349 +       case 176400:
 350 +       case 352800:
 351 +               type = ALLO_BOSS_CLK44EN;
 352 +               break;
 353 +       default:
 354 +               type = ALLO_BOSS_CLK48EN;
 355 +               break;
 356 +       }
 357 +       return type;
 358 +}
 359 +
 360 +static void snd_allo_boss_set_sclk(struct snd_soc_codec *codec,
 361 +       int sample_rate)
 362 +{
 363 +       struct pcm512x_priv *pcm512x = snd_soc_codec_get_drvdata(codec);
 364 +
 365 +       if (!IS_ERR(pcm512x->sclk)) {
 366 +               int ctype;
 367 +
 368 +               ctype = snd_allo_boss_clk_for_rate(sample_rate);
 369 +               clk_set_rate(pcm512x->sclk, (ctype == ALLO_BOSS_CLK44EN)
 370 +                               ? CLK_44EN_RATE : CLK_48EN_RATE);
 371 +               snd_allo_boss_select_clk(codec, ctype);
 372 +       }
 373 +}
 374 +
 375 +static int snd_allo_boss_init(struct snd_soc_pcm_runtime *rtd)
 376 +{
 377 +       struct snd_soc_codec *codec = rtd->codec;
 378 +       struct pcm512x_priv *priv = snd_soc_codec_get_drvdata(codec);
 379 +
 380 +       if (slave)
 381 +               snd_soc_allo_boss_master = false;
 382 +       else
 383 +               snd_soc_allo_boss_master =
 384 +                       snd_allo_boss_is_master_card(codec);
 385 +
 386 +       if (snd_soc_allo_boss_master) {
 387 +               struct snd_soc_dai_link *dai = rtd->dai_link;
 388 +
 389 +               dai->name = "BossDAC";
 390 +               dai->stream_name = "Boss DAC HiFi [Master]";
 391 +               dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
 392 +                       | SND_SOC_DAIFMT_CBM_CFM;
 393 +
 394 +               snd_soc_update_bits(codec, PCM512x_BCLK_LRCLK_CFG, 0x31, 0x11);
 395 +               snd_soc_update_bits(codec, PCM512x_MASTER_MODE, 0x03, 0x03);
 396 +               snd_soc_update_bits(codec, PCM512x_MASTER_CLKDIV_2, 0x7f, 63);
 397 +               /*
 398 +               * Default sclk to CLK_48EN_RATE, otherwise codec
 399 +               *  pcm512x_dai_startup_master method could call
 400 +               *  snd_pcm_hw_constraint_ratnums using CLK_44EN/64
 401 +               *  which will mask 384k sample rate.
 402 +               */
 403 +               if (!IS_ERR(priv->sclk))
 404 +                       clk_set_rate(priv->sclk, CLK_48EN_RATE);
 405 +       } else {
 406 +               priv->sclk = ERR_PTR(-ENOENT);
 407 +       }
 408 +
 409 +       snd_soc_update_bits(codec, PCM512x_GPIO_EN, 0x08, 0x08);
 410 +       snd_soc_update_bits(codec, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02);
 411 +       snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
 412 +
 413 +       if (digital_gain_0db_limit) {
 414 +               int ret;
 415 +               struct snd_soc_card *card = rtd->card;
 416 +
 417 +               ret = snd_soc_limit_volume(card, "Digital Playback Volume",
 418 +                               207);
 419 +               if (ret < 0)
 420 +                       dev_warn(card->dev, "Failed to set volume limit: %d\n",
 421 +                                       ret);
 422 +       }
 423 +
 424 +       return 0;
 425 +}
 426 +
 427 +static int snd_allo_boss_update_rate_den(
 428 +       struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
 429 +{
 430 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 431 +       struct snd_soc_codec *codec = rtd->codec;
 432 +       struct pcm512x_priv *pcm512x = snd_soc_codec_get_drvdata(codec);
 433 +       struct snd_ratnum *rats_no_pll;
 434 +       unsigned int num = 0, den = 0;
 435 +       int err;
 436 +
 437 +       rats_no_pll = devm_kzalloc(rtd->dev, sizeof(*rats_no_pll), GFP_KERNEL);
 438 +       if (!rats_no_pll)
 439 +               return -ENOMEM;
 440 +
 441 +       rats_no_pll->num = clk_get_rate(pcm512x->sclk) / 64;
 442 +       rats_no_pll->den_min = 1;
 443 +       rats_no_pll->den_max = 128;
 444 +       rats_no_pll->den_step = 1;
 445 +
 446 +       err = snd_interval_ratnum(hw_param_interval(params,
 447 +               SNDRV_PCM_HW_PARAM_RATE), 1, rats_no_pll, &num, &den);
 448 +       if (err >= 0 && den) {
 449 +               params->rate_num = num;
 450 +               params->rate_den = den;
 451 +       }
 452 +
 453 +       devm_kfree(rtd->dev, rats_no_pll);
 454 +       return 0;
 455 +}
 456 +
 457 +static int snd_allo_boss_set_bclk_ratio_pro(
 458 +       struct snd_soc_dai *cpu_dai, struct snd_pcm_hw_params *params)
 459 +{
 460 +       int bratio = snd_pcm_format_physical_width(params_format(params))
 461 +               * params_channels(params);
 462 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, bratio);
 463 +}
 464 +
 465 +static void snd_allo_boss_gpio_mute(struct snd_soc_card *card)
 466 +{
 467 +       if (mute_gpio)
 468 +               gpiod_set_value_cansleep(mute_gpio, 1);
 469 +}
 470 +
 471 +static void snd_allo_boss_gpio_unmute(struct snd_soc_card *card)
 472 +{
 473 +       if (mute_gpio)
 474 +               gpiod_set_value_cansleep(mute_gpio, 0);
 475 +}
 476 +
 477 +static int snd_allo_boss_set_bias_level(struct snd_soc_card *card,
 478 +       struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
 479 +{
 480 +       struct snd_soc_pcm_runtime *rtd;
 481 +       struct snd_soc_dai *codec_dai;
 482 +
 483 +       rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
 484 +       codec_dai = rtd->codec_dai;
 485 +
 486 +       if (dapm->dev != codec_dai->dev)
 487 +               return 0;
 488 +
 489 +       switch (level) {
 490 +       case SND_SOC_BIAS_PREPARE:
 491 +               if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
 492 +                       break;
 493 +               /* UNMUTE DAC */
 494 +               snd_allo_boss_gpio_unmute(card);
 495 +               break;
 496 +
 497 +       case SND_SOC_BIAS_STANDBY:
 498 +               if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
 499 +                       break;
 500 +               /* MUTE DAC */
 501 +               snd_allo_boss_gpio_mute(card);
 502 +               break;
 503 +
 504 +       default:
 505 +               break;
 506 +       }
 507 +
 508 +       return 0;
 509 +}
 510 +
 511 +static int snd_allo_boss_hw_params(
 512 +       struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
 513 +{
 514 +       int ret = 0;
 515 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 516 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 517 +       unsigned int sample_bits =
 518 +               snd_pcm_format_physical_width(params_format(params));
 519 +
 520 +       if (snd_soc_allo_boss_master) {
 521 +               struct snd_soc_codec *codec = rtd->codec;
 522 +
 523 +               snd_allo_boss_set_sclk(codec,
 524 +                       params_rate(params));
 525 +
 526 +               ret = snd_allo_boss_set_bclk_ratio_pro(cpu_dai,
 527 +                       params);
 528 +               if (!ret)
 529 +                       ret = snd_allo_boss_update_rate_den(
 530 +                               substream, params);
 531 +       } else {
 532 +               ret = snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
 533 +       }
 534 +       return ret;
 535 +}
 536 +
 537 +static int snd_allo_boss_startup(
 538 +       struct snd_pcm_substream *substream)
 539 +{
 540 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 541 +       struct snd_soc_codec *codec = rtd->codec;
 542 +       struct snd_soc_card *card = rtd->card;
 543 +
 544 +       snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
 545 +       snd_allo_boss_gpio_mute(card);
 546 +
 547 +       if (snd_soc_allo_boss_master) {
 548 +               struct pcm512x_priv *priv = snd_soc_codec_get_drvdata(codec);
 549 +               /*
 550 +                * Default sclk to CLK_48EN_RATE, otherwise codec
 551 +                * pcm512x_dai_startup_master method could call
 552 +                * snd_pcm_hw_constraint_ratnums using CLK_44EN/64
 553 +                * which will mask 384k sample rate.
 554 +                */
 555 +               if (!IS_ERR(priv->sclk))
 556 +                       clk_set_rate(priv->sclk, CLK_48EN_RATE);
 557 +       }
 558 +
 559 +       return 0;
 560 +}
 561 +
 562 +static void snd_allo_boss_shutdown(
 563 +       struct snd_pcm_substream *substream)
 564 +{
 565 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 566 +       struct snd_soc_codec *codec = rtd->codec;
 567 +
 568 +       snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08, 0x00);
 569 +}
 570 +
 571 +static int snd_allo_boss_prepare(
 572 +       struct snd_pcm_substream *substream)
 573 +{
 574 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 575 +       struct snd_soc_card *card = rtd->card;
 576 +
 577 +       snd_allo_boss_gpio_unmute(card);
 578 +       return 0;
 579 +}
 580 +/* machine stream operations */
 581 +static struct snd_soc_ops snd_allo_boss_ops = {
 582 +       .hw_params = snd_allo_boss_hw_params,
 583 +       .startup = snd_allo_boss_startup,
 584 +       .shutdown = snd_allo_boss_shutdown,
 585 +       .prepare = snd_allo_boss_prepare,
 586 +};
 587 +
 588 +static struct snd_soc_dai_link snd_allo_boss_dai[] = {
 589 +{
 590 +       .name           = "Boss DAC",
 591 +       .stream_name    = "Boss DAC HiFi",
 592 +       .cpu_dai_name   = "bcm2708-i2s.0",
 593 +       .codec_dai_name = "pcm512x-hifi",
 594 +       .platform_name  = "bcm2708-i2s.0",
 595 +       .codec_name     = "pcm512x.1-004d",
 596 +       .dai_fmt        = SND_SOC_DAIFMT_I2S |
 597 +                         SND_SOC_DAIFMT_NB_NF |
 598 +                         SND_SOC_DAIFMT_CBS_CFS,
 599 +       .ops            = &snd_allo_boss_ops,
 600 +       .init           = snd_allo_boss_init,
 601 +},
 602 +};
 603 +
 604 +/* audio machine driver */
 605 +static struct snd_soc_card snd_allo_boss = {
 606 +       .name         = "BossDAC",
 607 +       .owner        = THIS_MODULE,
 608 +       .dai_link     = snd_allo_boss_dai,
 609 +       .num_links    = ARRAY_SIZE(snd_allo_boss_dai),
 610 +};
 611 +
 612 +static int snd_allo_boss_probe(struct platform_device *pdev)
 613 +{
 614 +       int ret = 0;
 615 +
 616 +       snd_allo_boss.dev = &pdev->dev;
 617 +
 618 +       if (pdev->dev.of_node) {
 619 +               struct device_node *i2s_node;
 620 +               struct snd_soc_dai_link *dai;
 621 +
 622 +               dai = &snd_allo_boss_dai[0];
 623 +               i2s_node = of_parse_phandle(pdev->dev.of_node,
 624 +                                           "i2s-controller", 0);
 625 +
 626 +               if (i2s_node) {
 627 +                       dai->cpu_dai_name = NULL;
 628 +                       dai->cpu_of_node = i2s_node;
 629 +                       dai->platform_name = NULL;
 630 +                       dai->platform_of_node = i2s_node;
 631 +               }
 632 +
 633 +               digital_gain_0db_limit = !of_property_read_bool(
 634 +                       pdev->dev.of_node, "allo,24db_digital_gain");
 635 +               slave = of_property_read_bool(pdev->dev.of_node,
 636 +                                               "allo,slave");
 637 +
 638 +               mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute",
 639 +                                                       GPIOD_OUT_LOW);
 640 +               if (IS_ERR(mute_gpio)) {
 641 +                       ret = PTR_ERR(mute_gpio);
 642 +                       dev_err(&pdev->dev,
 643 +                               "failed to get mute gpio: %d\n", ret);
 644 +                       return ret;
 645 +               }
 646 +
 647 +               if (mute_gpio)
 648 +                       snd_allo_boss.set_bias_level =
 649 +                               snd_allo_boss_set_bias_level;
 650 +
 651 +               ret = snd_soc_register_card(&snd_allo_boss);
 652 +               if (ret) {
 653 +                       dev_err(&pdev->dev,
 654 +                               "snd_soc_register_card() failed: %d\n", ret);
 655 +                       return ret;
 656 +               }
 657 +
 658 +               if (mute_gpio)
 659 +                       snd_allo_boss_gpio_mute(&snd_allo_boss);
 660 +
 661 +               return 0;
 662 +       }
 663 +
 664 +       return -EINVAL;
 665 +}
 666 +
 667 +static int snd_allo_boss_remove(struct platform_device *pdev)
 668 +{
 669 +       snd_allo_boss_gpio_mute(&snd_allo_boss);
 670 +       return snd_soc_unregister_card(&snd_allo_boss);
 671 +}
 672 +
 673 +static const struct of_device_id snd_allo_boss_of_match[] = {
 674 +       { .compatible = "allo,boss-dac", },
 675 +       { /* sentinel */ },
 676 +};
 677 +MODULE_DEVICE_TABLE(of, snd_allo_boss_of_match);
 678 +
 679 +static struct platform_driver snd_allo_boss_driver = {
 680 +       .driver = {
 681 +               .name   = "snd-allo-boss-dac",
 682 +               .owner  = THIS_MODULE,
 683 +               .of_match_table = snd_allo_boss_of_match,
 684 +       },
 685 +       .probe          = snd_allo_boss_probe,
 686 +       .remove         = snd_allo_boss_remove,
 687 +};
 688 +
 689 +module_platform_driver(snd_allo_boss_driver);
 690 +
 691 +MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>");
 692 +MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Boss DAC");
 693 +MODULE_LICENSE("GPL v2");