git.librecmc.org Git - oweals/openwrt.git/blob

   1 From 4a5f5ef9da5c83374b5395d1b2b53a2cd36333ea 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 077/782] 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 ASoC: allo-boss-dac: fix S24_LE format
  18
  19 Remove set_bclk_ratio call so 24-bit data is transmitted in
  20 24 bclk cycles.
  21
  22 Signed-off-by: Matthias Reichl <hias@horus.com>
  23
  24 ASoC: allo-boss-dac: transmit S24_LE with 64 BCLK cycles
  25
  26 Signed-off-by: Matthias Reichl <hias@horus.com>
  27 ---
  28  drivers/clk/Makefile          |   1 +
  29  drivers/clk/clk-allo-dac.c    | 161 ++++++++++++
  30  sound/soc/bcm/allo-boss-dac.c | 456 ++++++++++++++++++++++++++++++++++
  31  3 files changed, 618 insertions(+)
  32  create mode 100644 drivers/clk/clk-allo-dac.c
  33  create mode 100644 sound/soc/bcm/allo-boss-dac.c
  34
  35 --- a/drivers/clk/Makefile
  36 +++ b/drivers/clk/Makefile
  37 @@ -18,6 +18,7 @@ endif
  38
  39  # hardware specific clock types
  40  # please keep this section sorted lexicographically by file path name
  41 +obj-$(CONFIG_SND_BCM2708_SOC_ALLO_BOSS_DAC)    += clk-allo-dac.o
  42  obj-$(CONFIG_MACH_ASM9260)             += clk-asm9260.o
  43  obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN)    += clk-axi-clkgen.o
  44  obj-$(CONFIG_ARCH_AXXIA)               += clk-axm5516.o
  45 --- /dev/null
  46 +++ b/drivers/clk/clk-allo-dac.c
  47 @@ -0,0 +1,161 @@
  48 +/*
  49 + * Clock Driver for Allo DAC
  50 + *
  51 + * Author:     Baswaraj K <jaikumar@cem-solutions.net>
  52 + *             Copyright 2016
  53 + *             based on code by Stuart MacLean
  54 + *
  55 + * This program is free software; you can redistribute it and/or
  56 + * modify it under the terms of the GNU General Public License
  57 + * version 2 as published by the Free Software Foundation.
  58 + *
  59 + * This program is distributed in the hope that it will be useful, but
  60 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  61 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  62 + * General Public License for more details.
  63 + */
  64 +
  65 +#include <linux/clk-provider.h>
  66 +#include <linux/clkdev.h>
  67 +#include <linux/kernel.h>
  68 +#include <linux/module.h>
  69 +#include <linux/of.h>
  70 +#include <linux/slab.h>
  71 +#include <linux/platform_device.h>
  72 +
  73 +/* Clock rate of CLK44EN attached to GPIO6 pin */
  74 +#define CLK_44EN_RATE 45158400UL
  75 +/* Clock rate of CLK48EN attached to GPIO3 pin */
  76 +#define CLK_48EN_RATE 49152000UL
  77 +
  78 +/**
  79 + * struct allo_dac_clk - Common struct to the Allo DAC
  80 + * @hw: clk_hw for the common clk framework
  81 + * @mode: 0 => CLK44EN, 1 => CLK48EN
  82 + */
  83 +struct clk_allo_hw {
  84 +       struct clk_hw hw;
  85 +       uint8_t mode;
  86 +};
  87 +
  88 +#define to_allo_clk(_hw) container_of(_hw, struct clk_allo_hw, hw)
  89 +
  90 +static const struct of_device_id clk_allo_dac_dt_ids[] = {
  91 +       { .compatible = "allo,dac-clk",},
  92 +       { }
  93 +};
  94 +MODULE_DEVICE_TABLE(of, clk_allo_dac_dt_ids);
  95 +
  96 +static unsigned long clk_allo_dac_recalc_rate(struct clk_hw *hw,
  97 +       unsigned long parent_rate)
  98 +{
  99 +       return (to_allo_clk(hw)->mode == 0) ? CLK_44EN_RATE :
 100 +               CLK_48EN_RATE;
 101 +}
 102 +
 103 +static long clk_allo_dac_round_rate(struct clk_hw *hw,
 104 +       unsigned long rate, unsigned long *parent_rate)
 105 +{
 106 +       long actual_rate;
 107 +
 108 +       if (rate <= CLK_44EN_RATE) {
 109 +               actual_rate = (long)CLK_44EN_RATE;
 110 +       } else if (rate >= CLK_48EN_RATE) {
 111 +               actual_rate = (long)CLK_48EN_RATE;
 112 +       } else {
 113 +               long diff44Rate = (long)(rate - CLK_44EN_RATE);
 114 +               long diff48Rate = (long)(CLK_48EN_RATE - rate);
 115 +
 116 +               if (diff44Rate < diff48Rate)
 117 +                       actual_rate = (long)CLK_44EN_RATE;
 118 +               else
 119 +                       actual_rate = (long)CLK_48EN_RATE;
 120 +       }
 121 +       return actual_rate;
 122 +}
 123 +
 124 +
 125 +static int clk_allo_dac_set_rate(struct clk_hw *hw,
 126 +       unsigned long rate, unsigned long parent_rate)
 127 +{
 128 +       unsigned long actual_rate;
 129 +       struct clk_allo_hw *clk = to_allo_clk(hw);
 130 +
 131 +       actual_rate = (unsigned long)clk_allo_dac_round_rate(hw, rate,
 132 +               &parent_rate);
 133 +       clk->mode = (actual_rate == CLK_44EN_RATE) ? 0 : 1;
 134 +       return 0;
 135 +}
 136 +
 137 +
 138 +const struct clk_ops clk_allo_dac_rate_ops = {
 139 +       .recalc_rate = clk_allo_dac_recalc_rate,
 140 +       .round_rate = clk_allo_dac_round_rate,
 141 +       .set_rate = clk_allo_dac_set_rate,
 142 +};
 143 +
 144 +static int clk_allo_dac_probe(struct platform_device *pdev)
 145 +{
 146 +       int ret;
 147 +       struct clk_allo_hw *proclk;
 148 +       struct clk *clk;
 149 +       struct device *dev;
 150 +       struct clk_init_data init;
 151 +
 152 +       dev = &pdev->dev;
 153 +
 154 +       proclk = kzalloc(sizeof(struct clk_allo_hw), GFP_KERNEL);
 155 +       if (!proclk)
 156 +               return -ENOMEM;
 157 +
 158 +       init.name = "clk-allo-dac";
 159 +       init.ops = &clk_allo_dac_rate_ops;
 160 +       init.flags = CLK_IS_BASIC;
 161 +       init.parent_names = NULL;
 162 +       init.num_parents = 0;
 163 +
 164 +       proclk->mode = 0;
 165 +       proclk->hw.init = &init;
 166 +
 167 +       clk = devm_clk_register(dev, &proclk->hw);
 168 +       if (!IS_ERR(clk)) {
 169 +               ret = of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
 170 +                       clk);
 171 +       } else {
 172 +               dev_err(dev, "Fail to register clock driver\n");
 173 +               kfree(proclk);
 174 +               ret = PTR_ERR(clk);
 175 +       }
 176 +       return ret;
 177 +}
 178 +
 179 +static int clk_allo_dac_remove(struct platform_device *pdev)
 180 +{
 181 +       of_clk_del_provider(pdev->dev.of_node);
 182 +       return 0;
 183 +}
 184 +
 185 +static struct platform_driver clk_allo_dac_driver = {
 186 +       .probe = clk_allo_dac_probe,
 187 +       .remove = clk_allo_dac_remove,
 188 +       .driver = {
 189 +               .name = "clk-allo-dac",
 190 +               .of_match_table = clk_allo_dac_dt_ids,
 191 +       },
 192 +};
 193 +
 194 +static int __init clk_allo_dac_init(void)
 195 +{
 196 +       return platform_driver_register(&clk_allo_dac_driver);
 197 +}
 198 +core_initcall(clk_allo_dac_init);
 199 +
 200 +static void __exit clk_allo_dac_exit(void)
 201 +{
 202 +       platform_driver_unregister(&clk_allo_dac_driver);
 203 +}
 204 +module_exit(clk_allo_dac_exit);
 205 +
 206 +MODULE_DESCRIPTION("Allo DAC clock driver");
 207 +MODULE_LICENSE("GPL v2");
 208 +MODULE_ALIAS("platform:clk-allo-dac");
 209 --- /dev/null
 210 +++ b/sound/soc/bcm/allo-boss-dac.c
 211 @@ -0,0 +1,456 @@
 212 +/*
 213 + * ALSA ASoC Machine Driver for Allo Boss DAC
 214 + *
 215 + * Author:     Baswaraj K <jaikumar@cem-solutions.net>
 216 + *             Copyright 2017
 217 + *             based on code by Daniel Matuschek,
 218 + *                              Stuart MacLean <stuart@hifiberry.com>
 219 + *             based on code by Florian Meier <florian.meier@koalo.de>
 220 + *
 221 + * This program is free software; you can redistribute it and/or
 222 + * modify it under the terms of the GNU General Public License
 223 + * version 2 as published by the Free Software Foundation.
 224 + *
 225 + * This program is distributed in the hope that it will be useful, but
 226 + * WITHOUT ANY WARRANTY; without even the implied warranty of
 227 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 228 + * General Public License for more details.
 229 + */
 230 +
 231 +#include <linux/module.h>
 232 +#include <linux/gpio/consumer.h>
 233 +#include <linux/platform_device.h>
 234 +#include <linux/clk.h>
 235 +#include <linux/delay.h>
 236 +
 237 +#include <sound/core.h>
 238 +#include <sound/pcm.h>
 239 +#include <sound/pcm_params.h>
 240 +#include <sound/soc.h>
 241 +#include "../codecs/pcm512x.h"
 242 +
 243 +#define ALLO_BOSS_NOCLOCK 0
 244 +#define ALLO_BOSS_CLK44EN 1
 245 +#define ALLO_BOSS_CLK48EN 2
 246 +
 247 +struct pcm512x_priv {
 248 +       struct regmap *regmap;
 249 +       struct clk *sclk;
 250 +};
 251 +
 252 +static struct gpio_desc *mute_gpio;
 253 +
 254 +/* Clock rate of CLK44EN attached to GPIO6 pin */
 255 +#define CLK_44EN_RATE 45158400UL
 256 +/* Clock rate of CLK48EN attached to GPIO3 pin */
 257 +#define CLK_48EN_RATE 49152000UL
 258 +
 259 +static bool slave;
 260 +static bool snd_soc_allo_boss_master;
 261 +static bool digital_gain_0db_limit = true;
 262 +
 263 +static void snd_allo_boss_select_clk(struct snd_soc_component *component,
 264 +       int clk_id)
 265 +{
 266 +       switch (clk_id) {
 267 +       case ALLO_BOSS_NOCLOCK:
 268 +               snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x00);
 269 +               break;
 270 +       case ALLO_BOSS_CLK44EN:
 271 +               snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x20);
 272 +               break;
 273 +       case ALLO_BOSS_CLK48EN:
 274 +               snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
 275 +               break;
 276 +       }
 277 +}
 278 +
 279 +static void snd_allo_boss_clk_gpio(struct snd_soc_component *component)
 280 +{
 281 +       snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x24, 0x24);
 282 +       snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_3, 0x0f, 0x02);
 283 +       snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_6, 0x0f, 0x02);
 284 +}
 285 +
 286 +static bool snd_allo_boss_is_sclk(struct snd_soc_component *component)
 287 +{
 288 +       unsigned int sck;
 289 +
 290 +       snd_soc_component_read(component, PCM512x_RATE_DET_4, &sck);
 291 +       return (!(sck & 0x40));
 292 +}
 293 +
 294 +static bool snd_allo_boss_is_sclk_sleep(
 295 +       struct snd_soc_component *component)
 296 +{
 297 +       msleep(2);
 298 +       return snd_allo_boss_is_sclk(component);
 299 +}
 300 +
 301 +static bool snd_allo_boss_is_master_card(struct snd_soc_component *component)
 302 +{
 303 +       bool isClk44EN, isClk48En, isNoClk;
 304 +
 305 +       snd_allo_boss_clk_gpio(component);
 306 +
 307 +       snd_allo_boss_select_clk(component, ALLO_BOSS_CLK44EN);
 308 +       isClk44EN = snd_allo_boss_is_sclk_sleep(component);
 309 +
 310 +       snd_allo_boss_select_clk(component, ALLO_BOSS_NOCLOCK);
 311 +       isNoClk = snd_allo_boss_is_sclk_sleep(component);
 312 +
 313 +       snd_allo_boss_select_clk(component, ALLO_BOSS_CLK48EN);
 314 +       isClk48En = snd_allo_boss_is_sclk_sleep(component);
 315 +
 316 +       return (isClk44EN && isClk48En && !isNoClk);
 317 +}
 318 +
 319 +static int snd_allo_boss_clk_for_rate(int sample_rate)
 320 +{
 321 +       int type;
 322 +
 323 +       switch (sample_rate) {
 324 +       case 11025:
 325 +       case 22050:
 326 +       case 44100:
 327 +       case 88200:
 328 +       case 176400:
 329 +       case 352800:
 330 +               type = ALLO_BOSS_CLK44EN;
 331 +               break;
 332 +       default:
 333 +               type = ALLO_BOSS_CLK48EN;
 334 +               break;
 335 +       }
 336 +       return type;
 337 +}
 338 +
 339 +static void snd_allo_boss_set_sclk(struct snd_soc_component *component,
 340 +       int sample_rate)
 341 +{
 342 +       struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
 343 +
 344 +       if (!IS_ERR(pcm512x->sclk)) {
 345 +               int ctype;
 346 +
 347 +               ctype = snd_allo_boss_clk_for_rate(sample_rate);
 348 +               clk_set_rate(pcm512x->sclk, (ctype == ALLO_BOSS_CLK44EN)
 349 +                               ? CLK_44EN_RATE : CLK_48EN_RATE);
 350 +               snd_allo_boss_select_clk(component, ctype);
 351 +       }
 352 +}
 353 +
 354 +static int snd_allo_boss_init(struct snd_soc_pcm_runtime *rtd)
 355 +{
 356 +       struct snd_soc_component *component = rtd->codec_dai->component;
 357 +       struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component);
 358 +
 359 +       if (slave)
 360 +               snd_soc_allo_boss_master = false;
 361 +       else
 362 +               snd_soc_allo_boss_master =
 363 +                       snd_allo_boss_is_master_card(component);
 364 +
 365 +       if (snd_soc_allo_boss_master) {
 366 +               struct snd_soc_dai_link *dai = rtd->dai_link;
 367 +
 368 +               dai->name = "BossDAC";
 369 +               dai->stream_name = "Boss DAC HiFi [Master]";
 370 +               dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
 371 +                       | SND_SOC_DAIFMT_CBM_CFM;
 372 +
 373 +               snd_soc_component_update_bits(component, PCM512x_BCLK_LRCLK_CFG, 0x31, 0x11);
 374 +               snd_soc_component_update_bits(component, PCM512x_MASTER_MODE, 0x03, 0x03);
 375 +               snd_soc_component_update_bits(component, PCM512x_MASTER_CLKDIV_2, 0x7f, 63);
 376 +               /*
 377 +               * Default sclk to CLK_48EN_RATE, otherwise codec
 378 +               *  pcm512x_dai_startup_master method could call
 379 +               *  snd_pcm_hw_constraint_ratnums using CLK_44EN/64
 380 +               *  which will mask 384k sample rate.
 381 +               */
 382 +               if (!IS_ERR(priv->sclk))
 383 +                       clk_set_rate(priv->sclk, CLK_48EN_RATE);
 384 +       } else {
 385 +               priv->sclk = ERR_PTR(-ENOENT);
 386 +       }
 387 +
 388 +       snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x08, 0x08);
 389 +       snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02);
 390 +       snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
 391 +
 392 +       if (digital_gain_0db_limit) {
 393 +               int ret;
 394 +               struct snd_soc_card *card = rtd->card;
 395 +
 396 +               ret = snd_soc_limit_volume(card, "Digital Playback Volume",
 397 +                               207);
 398 +               if (ret < 0)
 399 +                       dev_warn(card->dev, "Failed to set volume limit: %d\n",
 400 +                                       ret);
 401 +       }
 402 +
 403 +       return 0;
 404 +}
 405 +
 406 +static int snd_allo_boss_update_rate_den(
 407 +       struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
 408 +{
 409 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 410 +       struct snd_soc_component *component = rtd->codec_dai->component;
 411 +       struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
 412 +       struct snd_ratnum *rats_no_pll;
 413 +       unsigned int num = 0, den = 0;
 414 +       int err;
 415 +
 416 +       rats_no_pll = devm_kzalloc(rtd->dev, sizeof(*rats_no_pll), GFP_KERNEL);
 417 +       if (!rats_no_pll)
 418 +               return -ENOMEM;
 419 +
 420 +       rats_no_pll->num = clk_get_rate(pcm512x->sclk) / 64;
 421 +       rats_no_pll->den_min = 1;
 422 +       rats_no_pll->den_max = 128;
 423 +       rats_no_pll->den_step = 1;
 424 +
 425 +       err = snd_interval_ratnum(hw_param_interval(params,
 426 +               SNDRV_PCM_HW_PARAM_RATE), 1, rats_no_pll, &num, &den);
 427 +       if (err >= 0 && den) {
 428 +               params->rate_num = num;
 429 +               params->rate_den = den;
 430 +       }
 431 +
 432 +       devm_kfree(rtd->dev, rats_no_pll);
 433 +       return 0;
 434 +}
 435 +
 436 +static void snd_allo_boss_gpio_mute(struct snd_soc_card *card)
 437 +{
 438 +       if (mute_gpio)
 439 +               gpiod_set_value_cansleep(mute_gpio, 1);
 440 +}
 441 +
 442 +static void snd_allo_boss_gpio_unmute(struct snd_soc_card *card)
 443 +{
 444 +       if (mute_gpio)
 445 +               gpiod_set_value_cansleep(mute_gpio, 0);
 446 +}
 447 +
 448 +static int snd_allo_boss_set_bias_level(struct snd_soc_card *card,
 449 +       struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
 450 +{
 451 +       struct snd_soc_pcm_runtime *rtd;
 452 +       struct snd_soc_dai *codec_dai;
 453 +
 454 +       rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
 455 +       codec_dai = rtd->codec_dai;
 456 +
 457 +       if (dapm->dev != codec_dai->dev)
 458 +               return 0;
 459 +
 460 +       switch (level) {
 461 +       case SND_SOC_BIAS_PREPARE:
 462 +               if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
 463 +                       break;
 464 +               /* UNMUTE DAC */
 465 +               snd_allo_boss_gpio_unmute(card);
 466 +               break;
 467 +
 468 +       case SND_SOC_BIAS_STANDBY:
 469 +               if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
 470 +                       break;
 471 +               /* MUTE DAC */
 472 +               snd_allo_boss_gpio_mute(card);
 473 +               break;
 474 +
 475 +       default:
 476 +               break;
 477 +       }
 478 +
 479 +       return 0;
 480 +}
 481 +
 482 +static int snd_allo_boss_hw_params(
 483 +       struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
 484 +{
 485 +       int ret = 0;
 486 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 487 +       int channels = params_channels(params);
 488 +       int width = snd_pcm_format_physical_width(params_format(params));
 489 +
 490 +       if (snd_soc_allo_boss_master) {
 491 +               struct snd_soc_component *component = rtd->codec_dai->component;
 492 +
 493 +               snd_allo_boss_set_sclk(component,
 494 +                       params_rate(params));
 495 +
 496 +               ret = snd_allo_boss_update_rate_den(
 497 +                       substream, params);
 498 +               if (ret)
 499 +                       return ret;
 500 +       }
 501 +
 502 +       ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x03, 0x03,
 503 +               channels, width);
 504 +       if (ret)
 505 +               return ret;
 506 +       ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0x03, 0x03,
 507 +               channels, width);
 508 +       return ret;
 509 +}
 510 +
 511 +static int snd_allo_boss_startup(
 512 +       struct snd_pcm_substream *substream)
 513 +{
 514 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 515 +       struct snd_soc_component *component = rtd->codec_dai->component;
 516 +       struct snd_soc_card *card = rtd->card;
 517 +
 518 +       snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
 519 +       snd_allo_boss_gpio_mute(card);
 520 +
 521 +       if (snd_soc_allo_boss_master) {
 522 +               struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component);
 523 +               /*
 524 +                * Default sclk to CLK_48EN_RATE, otherwise codec
 525 +                * pcm512x_dai_startup_master method could call
 526 +                * snd_pcm_hw_constraint_ratnums using CLK_44EN/64
 527 +                * which will mask 384k sample rate.
 528 +                */
 529 +               if (!IS_ERR(priv->sclk))
 530 +                       clk_set_rate(priv->sclk, CLK_48EN_RATE);
 531 +       }
 532 +
 533 +       return 0;
 534 +}
 535 +
 536 +static void snd_allo_boss_shutdown(
 537 +       struct snd_pcm_substream *substream)
 538 +{
 539 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 540 +       struct snd_soc_component *component = rtd->codec_dai->component;
 541 +
 542 +       snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x00);
 543 +}
 544 +
 545 +static int snd_allo_boss_prepare(
 546 +       struct snd_pcm_substream *substream)
 547 +{
 548 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 549 +       struct snd_soc_card *card = rtd->card;
 550 +
 551 +       snd_allo_boss_gpio_unmute(card);
 552 +       return 0;
 553 +}
 554 +/* machine stream operations */
 555 +static struct snd_soc_ops snd_allo_boss_ops = {
 556 +       .hw_params = snd_allo_boss_hw_params,
 557 +       .startup = snd_allo_boss_startup,
 558 +       .shutdown = snd_allo_boss_shutdown,
 559 +       .prepare = snd_allo_boss_prepare,
 560 +};
 561 +
 562 +static struct snd_soc_dai_link snd_allo_boss_dai[] = {
 563 +{
 564 +       .name           = "Boss DAC",
 565 +       .stream_name    = "Boss DAC HiFi",
 566 +       .cpu_dai_name   = "bcm2708-i2s.0",
 567 +       .codec_dai_name = "pcm512x-hifi",
 568 +       .platform_name  = "bcm2708-i2s.0",
 569 +       .codec_name     = "pcm512x.1-004d",
 570 +       .dai_fmt        = SND_SOC_DAIFMT_I2S |
 571 +                         SND_SOC_DAIFMT_NB_NF |
 572 +                         SND_SOC_DAIFMT_CBS_CFS,
 573 +       .ops            = &snd_allo_boss_ops,
 574 +       .init           = snd_allo_boss_init,
 575 +},
 576 +};
 577 +
 578 +/* audio machine driver */
 579 +static struct snd_soc_card snd_allo_boss = {
 580 +       .name         = "BossDAC",
 581 +       .owner        = THIS_MODULE,
 582 +       .dai_link     = snd_allo_boss_dai,
 583 +       .num_links    = ARRAY_SIZE(snd_allo_boss_dai),
 584 +};
 585 +
 586 +static int snd_allo_boss_probe(struct platform_device *pdev)
 587 +{
 588 +       int ret = 0;
 589 +
 590 +       snd_allo_boss.dev = &pdev->dev;
 591 +
 592 +       if (pdev->dev.of_node) {
 593 +               struct device_node *i2s_node;
 594 +               struct snd_soc_dai_link *dai;
 595 +
 596 +               dai = &snd_allo_boss_dai[0];
 597 +               i2s_node = of_parse_phandle(pdev->dev.of_node,
 598 +                                           "i2s-controller", 0);
 599 +
 600 +               if (i2s_node) {
 601 +                       dai->cpu_dai_name = NULL;
 602 +                       dai->cpu_of_node = i2s_node;
 603 +                       dai->platform_name = NULL;
 604 +                       dai->platform_of_node = i2s_node;
 605 +               }
 606 +
 607 +               digital_gain_0db_limit = !of_property_read_bool(
 608 +                       pdev->dev.of_node, "allo,24db_digital_gain");
 609 +               slave = of_property_read_bool(pdev->dev.of_node,
 610 +                                               "allo,slave");
 611 +
 612 +               mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute",
 613 +                                                       GPIOD_OUT_LOW);
 614 +               if (IS_ERR(mute_gpio)) {
 615 +                       ret = PTR_ERR(mute_gpio);
 616 +                       dev_err(&pdev->dev,
 617 +                               "failed to get mute gpio: %d\n", ret);
 618 +                       return ret;
 619 +               }
 620 +
 621 +               if (mute_gpio)
 622 +                       snd_allo_boss.set_bias_level =
 623 +                               snd_allo_boss_set_bias_level;
 624 +
 625 +               ret = snd_soc_register_card(&snd_allo_boss);
 626 +               if (ret) {
 627 +                       dev_err(&pdev->dev,
 628 +                               "snd_soc_register_card() failed: %d\n", ret);
 629 +                       return ret;
 630 +               }
 631 +
 632 +               if (mute_gpio)
 633 +                       snd_allo_boss_gpio_mute(&snd_allo_boss);
 634 +
 635 +               return 0;
 636 +       }
 637 +
 638 +       return -EINVAL;
 639 +}
 640 +
 641 +static int snd_allo_boss_remove(struct platform_device *pdev)
 642 +{
 643 +       snd_allo_boss_gpio_mute(&snd_allo_boss);
 644 +       return snd_soc_unregister_card(&snd_allo_boss);
 645 +}
 646 +
 647 +static const struct of_device_id snd_allo_boss_of_match[] = {
 648 +       { .compatible = "allo,boss-dac", },
 649 +       { /* sentinel */ },
 650 +};
 651 +MODULE_DEVICE_TABLE(of, snd_allo_boss_of_match);
 652 +
 653 +static struct platform_driver snd_allo_boss_driver = {
 654 +       .driver = {
 655 +               .name   = "snd-allo-boss-dac",
 656 +               .owner  = THIS_MODULE,
 657 +               .of_match_table = snd_allo_boss_of_match,
 658 +       },
 659 +       .probe          = snd_allo_boss_probe,
 660 +       .remove         = snd_allo_boss_remove,
 661 +};
 662 +
 663 +module_platform_driver(snd_allo_boss_driver);
 664 +
 665 +MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>");
 666 +MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Boss DAC");
 667 +MODULE_LICENSE("GPL v2");