target/linux/brcm2708/patches-4.14/950-0077-New-driver-for-RRA-DigiDAC1-soundcard-using-WM8741-W.patch

   1 From b41def5d536b4389e2648286c03e1354a3cc1523 Mon Sep 17 00:00:00 2001
   2 From: escalator2015 <jmtasende@gmail.com>
   3 Date: Tue, 24 May 2016 16:20:09 +0100
   4 Subject: [PATCH 077/454] New driver for RRA DigiDAC1 soundcard using WM8741 +
   5  WM8804
   6
   7 ---
   8  sound/soc/bcm/Kconfig              |   8 +
   9  sound/soc/bcm/Makefile             |   2 +
  10  sound/soc/bcm/digidac1-soundcard.c | 422 +++++++++++++++++++++++++++++
  11  3 files changed, 432 insertions(+)
  12  create mode 100644 sound/soc/bcm/digidac1-soundcard.c
  13
  14 --- a/sound/soc/bcm/Kconfig
  15 +++ b/sound/soc/bcm/Kconfig
  16 @@ -109,3 +109,11 @@ config SND_AUDIOINJECTOR_PI_SOUNDCARD
  17         select SND_SOC_WM8731
  18         help
  19           Say Y or M if you want to add support for audioinjector.net Pi Hat
  20 +
  21 +config SND_DIGIDAC1_SOUNDCARD
  22 +        tristate "Support for Red Rocks Audio DigiDAC1"
  23 +        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  24 +        select SND_SOC_WM8804
  25 +        select SND_SOC_WM8741
  26 +        help
  27 +         Say Y or M if you want to add support for Red Rocks Audio DigiDAC1 board.
  28 --- a/sound/soc/bcm/Makefile
  29 +++ b/sound/soc/bcm/Makefile
  30 @@ -22,6 +22,7 @@ snd-soc-iqaudio-dac-objs := iqaudio-dac.
  31  snd-soc-iqaudio-digi-objs := iqaudio_digi.o
  32  snd-soc-raspidac3-objs := raspidac3.o
  33  snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
  34 +snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
  35
  36  obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
  37  obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) += snd-soc-hifiberry-amp.o
  38 @@ -36,4 +37,5 @@ obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC
  39  obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DIGI) += snd-soc-iqaudio-digi.o
  40  obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3) += snd-soc-raspidac3.o
  41  obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
  42 +obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
  43
  44 --- /dev/null
  45 +++ b/sound/soc/bcm/digidac1-soundcard.c
  46 @@ -0,0 +1,422 @@
  47 +/*
  48 + * ASoC Driver for RRA DigiDAC1
  49 + * Copyright 2016
  50 + * Author: José M. Tasende <vintage@redrocksaudio.es>
  51 + * based on the HifiBerry DAC driver by Florian Meier <florian.meier@koalo.de>
  52 + * and the Wolfson card driver by Nikesh Oswal, <Nikesh.Oswal@wolfsonmicro.com>
  53 + * This program is free software; you can redistribute it and/or
  54 + * modify it under the terms of the GNU General Public License
  55 + * version 2 as published by the Free Software Foundation.
  56 + *
  57 + * This program is distributed in the hope that it will be useful, but
  58 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  59 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  60 + * General Public License for more details.
  61 + */
  62 +
  63 +#include <linux/module.h>
  64 +#include <linux/platform_device.h>
  65 +#include <linux/i2c.h>
  66 +#include <sound/core.h>
  67 +#include <sound/pcm.h>
  68 +#include <sound/pcm_params.h>
  69 +#include <sound/soc.h>
  70 +#include <sound/jack.h>
  71 +#include <sound/soc-dapm.h>
  72 +#include <sound/tlv.h>
  73 +#include <linux/regulator/consumer.h>
  74 +
  75 +#include "../codecs/wm8804.h"
  76 +#include "../codecs/wm8741.h"
  77 +
  78 +#define WM8741_NUM_SUPPLIES 2
  79 +
  80 +/* codec private data */
  81 +struct wm8741_priv {
  82 +       struct wm8741_platform_data pdata;
  83 +       struct regmap *regmap;
  84 +       struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
  85 +       unsigned int sysclk;
  86 +       const struct snd_pcm_hw_constraint_list *sysclk_constraints;
  87 +};
  88 +
  89 +static int samplerate = 44100;
  90 +
  91 +/* New Alsa Controls not exposed by original wm8741 codec driver       */
  92 +/* in actual driver the att. adjustment is wrong because               */
  93 +/* this DAC has a coarse attenuation register with 4dB steps           */
  94 +/* and a fine level register with 0.125dB steps                                */
  95 +/* each register has 32 steps so combining both we have        1024 steps      */
  96 +/* of 0.125 dB.                                                                */
  97 +/* The original level controls from driver are removed at startup      */
  98 +/* and replaced by the corrected ones.                                 */
  99 +/* The same wm8741 driver can be used for wm8741 and wm8742 devices    */
 100 +
 101 +static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, 0, 13, 0);
 102 +static const DECLARE_TLV_DB_SCALE(dac_tlv_coarse, -12700, 400, 1);
 103 +static const char *w8741_dither[4] = {"Off", "RPDF", "TPDF", "HPDF"};
 104 +static const char *w8741_filter[5] = {
 105 +               "Type 1", "Type 2", "Type 3", "Type 4", "Type 5"};
 106 +static const char *w8741_switch[2] = {"Off", "On"};
 107 +static const struct soc_enum w8741_enum[] = {
 108 +SOC_ENUM_SINGLE(WM8741_MODE_CONTROL_2, 0, 4, w8741_dither),/* dithering type */
 109 +SOC_ENUM_SINGLE(WM8741_FILTER_CONTROL, 0, 5, w8741_filter),/* filter type */
 110 +SOC_ENUM_SINGLE(WM8741_FORMAT_CONTROL, 6, 2, w8741_switch),/* phase invert */
 111 +SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 0, 2, w8741_switch),/* volume ramp */
 112 +SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 3, 2, w8741_switch),/* soft mute */
 113 +};
 114 +
 115 +static const struct snd_kcontrol_new w8741_snd_controls_stereo[] = {
 116 +SOC_DOUBLE_R_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
 117 +               WM8741_DACRLSB_ATTENUATION, 0, 31, 1, dac_tlv_fine),
 118 +SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
 119 +               WM8741_DACRMSB_ATTENUATION, 0, 31, 1, dac_tlv_coarse),
 120 +SOC_ENUM("DAC Dither", w8741_enum[0]),
 121 +SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
 122 +SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
 123 +SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
 124 +SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
 125 +};
 126 +
 127 +static const struct snd_kcontrol_new w8741_snd_controls_mono_left[] = {
 128 +SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
 129 +               0, 31, 0, dac_tlv_fine),
 130 +SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
 131 +               0, 31, 1, dac_tlv_coarse),
 132 +SOC_ENUM("DAC Dither", w8741_enum[0]),
 133 +SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
 134 +SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
 135 +SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
 136 +SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
 137 +};
 138 +
 139 +static const struct snd_kcontrol_new w8741_snd_controls_mono_right[] = {
 140 +SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACRLSB_ATTENUATION,
 141 +       0, 31, 0, dac_tlv_fine),
 142 +SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACRMSB_ATTENUATION,
 143 +       0, 31, 1, dac_tlv_coarse),
 144 +SOC_ENUM("DAC Dither", w8741_enum[0]),
 145 +SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
 146 +SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
 147 +SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
 148 +SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
 149 +};
 150 +
 151 +static int w8741_add_controls(struct snd_soc_codec *codec)
 152 +{
 153 +       struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 154 +
 155 +       switch (wm8741->pdata.diff_mode) {
 156 +       case WM8741_DIFF_MODE_STEREO:
 157 +       case WM8741_DIFF_MODE_STEREO_REVERSED:
 158 +               snd_soc_add_codec_controls(codec,
 159 +                               w8741_snd_controls_stereo,
 160 +                               ARRAY_SIZE(w8741_snd_controls_stereo));
 161 +               break;
 162 +       case WM8741_DIFF_MODE_MONO_LEFT:
 163 +               snd_soc_add_codec_controls(codec,
 164 +                               w8741_snd_controls_mono_left,
 165 +                               ARRAY_SIZE(w8741_snd_controls_mono_left));
 166 +               break;
 167 +       case WM8741_DIFF_MODE_MONO_RIGHT:
 168 +               snd_soc_add_codec_controls(codec,
 169 +                               w8741_snd_controls_mono_right,
 170 +                               ARRAY_SIZE(w8741_snd_controls_mono_right));
 171 +               break;
 172 +       default:
 173 +               return -EINVAL;
 174 +       }
 175 +
 176 +       return 0;
 177 +}
 178 +
 179 +static int digidac1_soundcard_init(struct snd_soc_pcm_runtime *rtd)
 180 +{
 181 +       struct snd_soc_codec *codec = rtd->codec;
 182 +       struct snd_soc_card *card = rtd->card;
 183 +       struct snd_soc_pcm_runtime *wm8741_rtd;
 184 +       struct snd_soc_codec *wm8741_codec;
 185 +       struct snd_card *sound_card = card->snd_card;
 186 +       struct snd_kcontrol *kctl;
 187 +       int ret;
 188 +
 189 +       wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
 190 +       if (!wm8741_rtd) {
 191 +               dev_warn(card->dev, "digidac1_soundcard_init: couldn't get wm8741 rtd\n");
 192 +               return -EFAULT;
 193 +       }
 194 +       wm8741_codec = wm8741_rtd->codec;
 195 +       ret = w8741_add_controls(wm8741_codec);
 196 +       if (ret < 0)
 197 +               dev_warn(card->dev, "Failed to add new wm8741 controls: %d\n",
 198 +               ret);
 199 +
 200 +       /* enable TX output */
 201 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
 202 +
 203 +       kctl = snd_soc_card_get_kcontrol(card,
 204 +               "Playback Volume");
 205 +       if (kctl) {
 206 +               kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
 207 +               snd_ctl_remove(sound_card, kctl);
 208 +               }
 209 +       kctl = snd_soc_card_get_kcontrol(card,
 210 +               "Fine Playback Volume");
 211 +       if (kctl) {
 212 +               kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
 213 +               snd_ctl_remove(sound_card, kctl);
 214 +               }
 215 +       return 0;
 216 +}
 217 +
 218 +static int digidac1_soundcard_startup(struct snd_pcm_substream *substream)
 219 +{
 220 +       /* turn on wm8804 digital output */
 221 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 222 +       struct snd_soc_codec *codec = rtd->codec;
 223 +       struct snd_soc_card *card = rtd->card;
 224 +       struct snd_soc_pcm_runtime *wm8741_rtd;
 225 +       struct snd_soc_codec *wm8741_codec;
 226 +
 227 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00);
 228 +       wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
 229 +       if (!wm8741_rtd) {
 230 +               dev_warn(card->dev, "digidac1_soundcard_startup: couldn't get WM8741 rtd\n");
 231 +               return -EFAULT;
 232 +       }
 233 +       wm8741_codec = wm8741_rtd->codec;
 234 +
 235 +       /* latch wm8741 level */
 236 +       snd_soc_update_bits(wm8741_codec, WM8741_DACLLSB_ATTENUATION,
 237 +               WM8741_UPDATELL, WM8741_UPDATELL);
 238 +       snd_soc_update_bits(wm8741_codec, WM8741_DACLMSB_ATTENUATION,
 239 +               WM8741_UPDATELM, WM8741_UPDATELM);
 240 +       snd_soc_update_bits(wm8741_codec, WM8741_DACRLSB_ATTENUATION,
 241 +               WM8741_UPDATERL, WM8741_UPDATERL);
 242 +       snd_soc_update_bits(wm8741_codec, WM8741_DACRMSB_ATTENUATION,
 243 +               WM8741_UPDATERM, WM8741_UPDATERM);
 244 +
 245 +       return 0;
 246 +}
 247 +
 248 +static void digidac1_soundcard_shutdown(struct snd_pcm_substream *substream)
 249 +{
 250 +       /* turn off wm8804 digital output */
 251 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 252 +       struct snd_soc_codec *codec = rtd->codec;
 253 +
 254 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c);
 255 +}
 256 +
 257 +static int digidac1_soundcard_hw_params(struct snd_pcm_substream *substream,
 258 +                                      struct snd_pcm_hw_params *params)
 259 +{
 260 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 261 +       struct snd_soc_dai *codec_dai = rtd->codec_dai;
 262 +       struct snd_soc_codec *codec = rtd->codec;
 263 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 264 +       struct snd_soc_card *card = rtd->card;
 265 +       struct snd_soc_pcm_runtime *wm8741_rtd;
 266 +       struct snd_soc_codec *wm8741_codec;
 267 +
 268 +       int sysclk = 27000000;
 269 +       long mclk_freq = 0;
 270 +       int mclk_div = 1;
 271 +       int sampling_freq = 1;
 272 +       int ret;
 273 +
 274 +       wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
 275 +       if (!wm8741_rtd) {
 276 +               dev_warn(card->dev, "digidac1_soundcard_hw_params: couldn't get WM8741 rtd\n");
 277 +               return -EFAULT;
 278 +       }
 279 +       wm8741_codec = wm8741_rtd->codec;
 280 +       samplerate = params_rate(params);
 281 +
 282 +       if (samplerate <= 96000) {
 283 +               mclk_freq = samplerate*256;
 284 +               mclk_div = WM8804_MCLKDIV_256FS;
 285 +       } else {
 286 +               mclk_freq = samplerate*128;
 287 +               mclk_div = WM8804_MCLKDIV_128FS;
 288 +               }
 289 +
 290 +       switch (samplerate) {
 291 +       case 32000:
 292 +               sampling_freq = 0x03;
 293 +               break;
 294 +       case 44100:
 295 +               sampling_freq = 0x00;
 296 +               break;
 297 +       case 48000:
 298 +               sampling_freq = 0x02;
 299 +               break;
 300 +       case 88200:
 301 +               sampling_freq = 0x08;
 302 +               break;
 303 +       case 96000:
 304 +               sampling_freq = 0x0a;
 305 +               break;
 306 +       case 176400:
 307 +               sampling_freq = 0x0c;
 308 +               break;
 309 +       case 192000:
 310 +               sampling_freq = 0x0e;
 311 +               break;
 312 +       default:
 313 +               dev_err(codec->dev,
 314 +               "Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
 315 +               samplerate);
 316 +       }
 317 +
 318 +       snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
 319 +       snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
 320 +
 321 +       ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
 322 +               sysclk, SND_SOC_CLOCK_OUT);
 323 +       if (ret < 0) {
 324 +               dev_err(codec->dev,
 325 +               "Failed to set WM8804 SYSCLK: %d\n", ret);
 326 +               return ret;
 327 +       }
 328 +       /* Enable wm8804 TX output */
 329 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
 330 +
 331 +       /* wm8804 Power on */
 332 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
 333 +
 334 +       /* wm8804 set sampling frequency status bits */
 335 +       snd_soc_update_bits(codec, WM8804_SPDTX4, 0x0f, sampling_freq);
 336 +
 337 +       /* Now update wm8741 registers for the correct oversampling */
 338 +       if (samplerate <= 48000)
 339 +               snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
 340 +                WM8741_OSR_MASK, 0x00);
 341 +       else if (samplerate <= 96000)
 342 +               snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
 343 +                WM8741_OSR_MASK, 0x20);
 344 +       else
 345 +               snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
 346 +                WM8741_OSR_MASK, 0x40);
 347 +
 348 +       /* wm8741 bit size */
 349 +       switch (params_width(params)) {
 350 +       case 16:
 351 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 352 +                WM8741_IWL_MASK, 0x00);
 353 +               break;
 354 +       case 20:
 355 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 356 +                WM8741_IWL_MASK, 0x01);
 357 +               break;
 358 +       case 24:
 359 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 360 +                WM8741_IWL_MASK, 0x02);
 361 +               break;
 362 +       case 32:
 363 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 364 +                WM8741_IWL_MASK, 0x03);
 365 +               break;
 366 +       default:
 367 +               dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
 368 +                       params_width(params));
 369 +               return -EINVAL;
 370 +       }
 371 +
 372 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
 373 +}
 374 +/* machine stream operations */
 375 +static struct snd_soc_ops digidac1_soundcard_ops = {
 376 +       .hw_params      = digidac1_soundcard_hw_params,
 377 +       .startup        = digidac1_soundcard_startup,
 378 +       .shutdown       = digidac1_soundcard_shutdown,
 379 +};
 380 +
 381 +static struct snd_soc_dai_link digidac1_soundcard_dai[] = {
 382 +       {
 383 +       .name           = "RRA DigiDAC1",
 384 +       .stream_name    = "RRA DigiDAC1 HiFi",
 385 +       .cpu_dai_name   = "bcm2708-i2s.0",
 386 +       .codec_dai_name = "wm8804-spdif",
 387 +       .platform_name  = "bcm2708-i2s.0",
 388 +       .codec_name     = "wm8804.1-003b",
 389 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 390 +                               SND_SOC_DAIFMT_CBM_CFM,
 391 +       .ops            = &digidac1_soundcard_ops,
 392 +       .init           = digidac1_soundcard_init,
 393 +       },
 394 +       {
 395 +       .name           = "RRA DigiDAC11",
 396 +       .stream_name    = "RRA DigiDAC11 HiFi",
 397 +       .cpu_dai_name   = "wm8804-spdif",
 398 +       .codec_dai_name = "wm8741",
 399 +       .codec_name     = "wm8741.1-001a",
 400 +       .dai_fmt        = SND_SOC_DAIFMT_I2S
 401 +                       | SND_SOC_DAIFMT_NB_NF
 402 +                       | SND_SOC_DAIFMT_CBS_CFS,
 403 +       },
 404 +};
 405 +
 406 +/* audio machine driver */
 407 +static struct snd_soc_card digidac1_soundcard = {
 408 +       .name           = "digidac1-soundcard",
 409 +       .owner          = THIS_MODULE,
 410 +       .dai_link       = digidac1_soundcard_dai,
 411 +       .num_links      = ARRAY_SIZE(digidac1_soundcard_dai),
 412 +};
 413 +
 414 +static int digidac1_soundcard_probe(struct platform_device *pdev)
 415 +{
 416 +       int ret = 0;
 417 +
 418 +       digidac1_soundcard.dev = &pdev->dev;
 419 +
 420 +       if (pdev->dev.of_node) {
 421 +               struct device_node *i2s_node;
 422 +               struct snd_soc_dai_link *dai = &digidac1_soundcard_dai[0];
 423 +
 424 +               i2s_node = of_parse_phandle(pdev->dev.of_node,
 425 +                                       "i2s-controller", 0);
 426 +
 427 +               if (i2s_node) {
 428 +                       dai->cpu_dai_name = NULL;
 429 +                       dai->cpu_of_node = i2s_node;
 430 +                       dai->platform_name = NULL;
 431 +                       dai->platform_of_node = i2s_node;
 432 +               }
 433 +       }
 434 +
 435 +       ret = snd_soc_register_card(&digidac1_soundcard);
 436 +       if (ret && ret != -EPROBE_DEFER)
 437 +               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
 438 +                       ret);
 439 +
 440 +       return ret;
 441 +}
 442 +
 443 +static int digidac1_soundcard_remove(struct platform_device *pdev)
 444 +{
 445 +       return snd_soc_unregister_card(&digidac1_soundcard);
 446 +}
 447 +
 448 +static const struct of_device_id digidac1_soundcard_of_match[] = {
 449 +       { .compatible = "rra,digidac1-soundcard", },
 450 +       {},
 451 +};
 452 +MODULE_DEVICE_TABLE(of, digidac1_soundcard_of_match);
 453 +
 454 +static struct platform_driver digidac1_soundcard_driver = {
 455 +       .driver = {
 456 +                       .name           = "digidac1-audio",
 457 +                       .owner          = THIS_MODULE,
 458 +                       .of_match_table = digidac1_soundcard_of_match,
 459 +       },
 460 +       .probe          = digidac1_soundcard_probe,
 461 +       .remove         = digidac1_soundcard_remove,
 462 +};
 463 +
 464 +module_platform_driver(digidac1_soundcard_driver);
 465 +
 466 +MODULE_AUTHOR("José M. Tasende <vintage@redrocksaudio.es>");
 467 +MODULE_DESCRIPTION("ASoC Driver for RRA DigiDAC1");
 468 +MODULE_LICENSE("GPL v2");