target/linux/brcm2708/patches-4.9/0081-New-driver-for-RRA-DigiDAC1-soundcard-using-WM8741-W.patch

   1 From e5d85d533e7ea8fd5c68d4601ff2b8034bc4aaa9 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] New driver for RRA DigiDAC1 soundcard using WM8741 + WM8804
   5
   6 ---
   7  sound/soc/bcm/Kconfig              |   8 +
   8  sound/soc/bcm/Makefile             |   2 +
   9  sound/soc/bcm/digidac1-soundcard.c | 422 +++++++++++++++++++++++++++++++++++++
  10  3 files changed, 432 insertions(+)
  11  create mode 100644 sound/soc/bcm/digidac1-soundcard.c
  12
  13 --- a/sound/soc/bcm/Kconfig
  14 +++ b/sound/soc/bcm/Kconfig
  15 @@ -108,3 +108,11 @@ config SND_AUDIOINJECTOR_PI_SOUNDCARD
  16         select SND_SOC_WM8731
  17         help
  18           Say Y or M if you want to add support for audioinjector.net Pi Hat
  19 +
  20 +config SND_DIGIDAC1_SOUNDCARD
  21 +        tristate "Support for Red Rocks Audio DigiDAC1"
  22 +        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
  23 +        select SND_SOC_WM8804
  24 +        select SND_SOC_WM8741
  25 +        help
  26 +         Say Y or M if you want to add support for Red Rocks Audio DigiDAC1 board.
  27 --- a/sound/soc/bcm/Makefile
  28 +++ b/sound/soc/bcm/Makefile
  29 @@ -22,6 +22,7 @@ snd-soc-iqaudio-dac-objs := iqaudio-dac.
  30  snd-soc-iqaudio-digi-objs := iqaudio_digi.o
  31  snd-soc-raspidac3-objs := raspidac3.o
  32  snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
  33 +snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
  34
  35  obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
  36  obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) += snd-soc-hifiberry-amp.o
  37 @@ -36,4 +37,5 @@ obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC
  38  obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DIGI) += snd-soc-iqaudio-digi.o
  39  obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3) += snd-soc-raspidac3.o
  40  obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
  41 +obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
  42
  43 --- /dev/null
  44 +++ b/sound/soc/bcm/digidac1-soundcard.c
  45 @@ -0,0 +1,422 @@
  46 +/*
  47 + * ASoC Driver for RRA DigiDAC1
  48 + * Copyright 2016
  49 + * Author: José M. Tasende <vintage@redrocksaudio.es>
  50 + * based on the HifiBerry DAC driver by Florian Meier <florian.meier@koalo.de>
  51 + * and the Wolfson card driver by Nikesh Oswal, <Nikesh.Oswal@wolfsonmicro.com>
  52 + * This program is free software; you can redistribute it and/or
  53 + * modify it under the terms of the GNU General Public License
  54 + * version 2 as published by the Free Software Foundation.
  55 + *
  56 + * This program is distributed in the hope that it will be useful, but
  57 + * WITHOUT ANY WARRANTY; without even the implied warranty of
  58 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  59 + * General Public License for more details.
  60 + */
  61 +
  62 +#include <linux/module.h>
  63 +#include <linux/platform_device.h>
  64 +#include <linux/i2c.h>
  65 +#include <sound/core.h>
  66 +#include <sound/pcm.h>
  67 +#include <sound/pcm_params.h>
  68 +#include <sound/soc.h>
  69 +#include <sound/jack.h>
  70 +#include <sound/soc-dapm.h>
  71 +#include <sound/tlv.h>
  72 +#include <linux/regulator/consumer.h>
  73 +
  74 +#include "../codecs/wm8804.h"
  75 +#include "../codecs/wm8741.h"
  76 +
  77 +#define WM8741_NUM_SUPPLIES 2
  78 +
  79 +/* codec private data */
  80 +struct wm8741_priv {
  81 +       struct wm8741_platform_data pdata;
  82 +       struct regmap *regmap;
  83 +       struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
  84 +       unsigned int sysclk;
  85 +       const struct snd_pcm_hw_constraint_list *sysclk_constraints;
  86 +};
  87 +
  88 +static int samplerate = 44100;
  89 +
  90 +/* New Alsa Controls not exposed by original wm8741 codec driver       */
  91 +/* in actual driver the att. adjustment is wrong because               */
  92 +/* this DAC has a coarse attenuation register with 4dB steps           */
  93 +/* and a fine level register with 0.125dB steps                                */
  94 +/* each register has 32 steps so combining both we have        1024 steps      */
  95 +/* of 0.125 dB.                                                                */
  96 +/* The original level controls from driver are removed at startup      */
  97 +/* and replaced by the corrected ones.                                 */
  98 +/* The same wm8741 driver can be used for wm8741 and wm8742 devices    */
  99 +
 100 +static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, 0, 13, 0);
 101 +static const DECLARE_TLV_DB_SCALE(dac_tlv_coarse, -12700, 400, 1);
 102 +static const char *w8741_dither[4] = {"Off", "RPDF", "TPDF", "HPDF"};
 103 +static const char *w8741_filter[5] = {
 104 +               "Type 1", "Type 2", "Type 3", "Type 4", "Type 5"};
 105 +static const char *w8741_switch[2] = {"Off", "On"};
 106 +static const struct soc_enum w8741_enum[] = {
 107 +SOC_ENUM_SINGLE(WM8741_MODE_CONTROL_2, 0, 4, w8741_dither),/* dithering type */
 108 +SOC_ENUM_SINGLE(WM8741_FILTER_CONTROL, 0, 5, w8741_filter),/* filter type */
 109 +SOC_ENUM_SINGLE(WM8741_FORMAT_CONTROL, 6, 2, w8741_switch),/* phase invert */
 110 +SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 0, 2, w8741_switch),/* volume ramp */
 111 +SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 3, 2, w8741_switch),/* soft mute */
 112 +};
 113 +
 114 +static const struct snd_kcontrol_new w8741_snd_controls_stereo[] = {
 115 +SOC_DOUBLE_R_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
 116 +               WM8741_DACRLSB_ATTENUATION, 0, 31, 1, dac_tlv_fine),
 117 +SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
 118 +               WM8741_DACRMSB_ATTENUATION, 0, 31, 1, dac_tlv_coarse),
 119 +SOC_ENUM("DAC Dither", w8741_enum[0]),
 120 +SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
 121 +SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
 122 +SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
 123 +SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
 124 +};
 125 +
 126 +static const struct snd_kcontrol_new w8741_snd_controls_mono_left[] = {
 127 +SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
 128 +               0, 31, 0, dac_tlv_fine),
 129 +SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
 130 +               0, 31, 1, dac_tlv_coarse),
 131 +SOC_ENUM("DAC Dither", w8741_enum[0]),
 132 +SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
 133 +SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
 134 +SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
 135 +SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
 136 +};
 137 +
 138 +static const struct snd_kcontrol_new w8741_snd_controls_mono_right[] = {
 139 +SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACRLSB_ATTENUATION,
 140 +       0, 31, 0, dac_tlv_fine),
 141 +SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACRMSB_ATTENUATION,
 142 +       0, 31, 1, dac_tlv_coarse),
 143 +SOC_ENUM("DAC Dither", w8741_enum[0]),
 144 +SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
 145 +SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
 146 +SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
 147 +SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
 148 +};
 149 +
 150 +static int w8741_add_controls(struct snd_soc_codec *codec)
 151 +{
 152 +       struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 153 +
 154 +       switch (wm8741->pdata.diff_mode) {
 155 +       case WM8741_DIFF_MODE_STEREO:
 156 +       case WM8741_DIFF_MODE_STEREO_REVERSED:
 157 +               snd_soc_add_codec_controls(codec,
 158 +                               w8741_snd_controls_stereo,
 159 +                               ARRAY_SIZE(w8741_snd_controls_stereo));
 160 +               break;
 161 +       case WM8741_DIFF_MODE_MONO_LEFT:
 162 +               snd_soc_add_codec_controls(codec,
 163 +                               w8741_snd_controls_mono_left,
 164 +                               ARRAY_SIZE(w8741_snd_controls_mono_left));
 165 +               break;
 166 +       case WM8741_DIFF_MODE_MONO_RIGHT:
 167 +               snd_soc_add_codec_controls(codec,
 168 +                               w8741_snd_controls_mono_right,
 169 +                               ARRAY_SIZE(w8741_snd_controls_mono_right));
 170 +               break;
 171 +       default:
 172 +               return -EINVAL;
 173 +       }
 174 +
 175 +       return 0;
 176 +}
 177 +
 178 +static int digidac1_soundcard_init(struct snd_soc_pcm_runtime *rtd)
 179 +{
 180 +       struct snd_soc_codec *codec = rtd->codec;
 181 +       struct snd_soc_card *card = rtd->card;
 182 +       struct snd_soc_pcm_runtime *wm8741_rtd;
 183 +       struct snd_soc_codec *wm8741_codec;
 184 +       struct snd_card *sound_card = card->snd_card;
 185 +       struct snd_kcontrol *kctl;
 186 +       int ret;
 187 +
 188 +       wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
 189 +       if (!wm8741_rtd) {
 190 +               dev_warn(card->dev, "digidac1_soundcard_init: couldn't get wm8741 rtd\n");
 191 +               return -EFAULT;
 192 +       }
 193 +       wm8741_codec = wm8741_rtd->codec;
 194 +       ret = w8741_add_controls(wm8741_codec);
 195 +       if (ret < 0)
 196 +               dev_warn(card->dev, "Failed to add new wm8741 controls: %d\n",
 197 +               ret);
 198 +
 199 +       /* enable TX output */
 200 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
 201 +
 202 +       kctl = snd_soc_card_get_kcontrol(card,
 203 +               "Playback Volume");
 204 +       if (kctl) {
 205 +               kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
 206 +               snd_ctl_remove(sound_card, kctl);
 207 +               }
 208 +       kctl = snd_soc_card_get_kcontrol(card,
 209 +               "Fine Playback Volume");
 210 +       if (kctl) {
 211 +               kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
 212 +               snd_ctl_remove(sound_card, kctl);
 213 +               }
 214 +       return 0;
 215 +}
 216 +
 217 +static int digidac1_soundcard_startup(struct snd_pcm_substream *substream)
 218 +{
 219 +       /* turn on wm8804 digital output */
 220 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 221 +       struct snd_soc_codec *codec = rtd->codec;
 222 +       struct snd_soc_card *card = rtd->card;
 223 +       struct snd_soc_pcm_runtime *wm8741_rtd;
 224 +       struct snd_soc_codec *wm8741_codec;
 225 +
 226 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00);
 227 +       wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
 228 +       if (!wm8741_rtd) {
 229 +               dev_warn(card->dev, "digidac1_soundcard_startup: couldn't get WM8741 rtd\n");
 230 +               return -EFAULT;
 231 +       }
 232 +       wm8741_codec = wm8741_rtd->codec;
 233 +
 234 +       /* latch wm8741 level */
 235 +       snd_soc_update_bits(wm8741_codec, WM8741_DACLLSB_ATTENUATION,
 236 +               WM8741_UPDATELL, WM8741_UPDATELL);
 237 +       snd_soc_update_bits(wm8741_codec, WM8741_DACLMSB_ATTENUATION,
 238 +               WM8741_UPDATELM, WM8741_UPDATELM);
 239 +       snd_soc_update_bits(wm8741_codec, WM8741_DACRLSB_ATTENUATION,
 240 +               WM8741_UPDATERL, WM8741_UPDATERL);
 241 +       snd_soc_update_bits(wm8741_codec, WM8741_DACRMSB_ATTENUATION,
 242 +               WM8741_UPDATERM, WM8741_UPDATERM);
 243 +
 244 +       return 0;
 245 +}
 246 +
 247 +static void digidac1_soundcard_shutdown(struct snd_pcm_substream *substream)
 248 +{
 249 +       /* turn off wm8804 digital output */
 250 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 251 +       struct snd_soc_codec *codec = rtd->codec;
 252 +
 253 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c);
 254 +}
 255 +
 256 +static int digidac1_soundcard_hw_params(struct snd_pcm_substream *substream,
 257 +                                      struct snd_pcm_hw_params *params)
 258 +{
 259 +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
 260 +       struct snd_soc_dai *codec_dai = rtd->codec_dai;
 261 +       struct snd_soc_codec *codec = rtd->codec;
 262 +       struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 263 +       struct snd_soc_card *card = rtd->card;
 264 +       struct snd_soc_pcm_runtime *wm8741_rtd;
 265 +       struct snd_soc_codec *wm8741_codec;
 266 +
 267 +       int sysclk = 27000000;
 268 +       long mclk_freq = 0;
 269 +       int mclk_div = 1;
 270 +       int sampling_freq = 1;
 271 +       int ret;
 272 +
 273 +       wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
 274 +       if (!wm8741_rtd) {
 275 +               dev_warn(card->dev, "digidac1_soundcard_hw_params: couldn't get WM8741 rtd\n");
 276 +               return -EFAULT;
 277 +       }
 278 +       wm8741_codec = wm8741_rtd->codec;
 279 +       samplerate = params_rate(params);
 280 +
 281 +       if (samplerate <= 96000) {
 282 +               mclk_freq = samplerate*256;
 283 +               mclk_div = WM8804_MCLKDIV_256FS;
 284 +       } else {
 285 +               mclk_freq = samplerate*128;
 286 +               mclk_div = WM8804_MCLKDIV_128FS;
 287 +               }
 288 +
 289 +       switch (samplerate) {
 290 +       case 32000:
 291 +               sampling_freq = 0x03;
 292 +               break;
 293 +       case 44100:
 294 +               sampling_freq = 0x00;
 295 +               break;
 296 +       case 48000:
 297 +               sampling_freq = 0x02;
 298 +               break;
 299 +       case 88200:
 300 +               sampling_freq = 0x08;
 301 +               break;
 302 +       case 96000:
 303 +               sampling_freq = 0x0a;
 304 +               break;
 305 +       case 176400:
 306 +               sampling_freq = 0x0c;
 307 +               break;
 308 +       case 192000:
 309 +               sampling_freq = 0x0e;
 310 +               break;
 311 +       default:
 312 +               dev_err(codec->dev,
 313 +               "Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
 314 +               samplerate);
 315 +       }
 316 +
 317 +       snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
 318 +       snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
 319 +
 320 +       ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
 321 +               sysclk, SND_SOC_CLOCK_OUT);
 322 +       if (ret < 0) {
 323 +               dev_err(codec->dev,
 324 +               "Failed to set WM8804 SYSCLK: %d\n", ret);
 325 +               return ret;
 326 +       }
 327 +       /* Enable wm8804 TX output */
 328 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
 329 +
 330 +       /* wm8804 Power on */
 331 +       snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
 332 +
 333 +       /* wm8804 set sampling frequency status bits */
 334 +       snd_soc_update_bits(codec, WM8804_SPDTX4, 0x0f, sampling_freq);
 335 +
 336 +       /* Now update wm8741 registers for the correct oversampling */
 337 +       if (samplerate <= 48000)
 338 +               snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
 339 +                WM8741_OSR_MASK, 0x00);
 340 +       else if (samplerate <= 96000)
 341 +               snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
 342 +                WM8741_OSR_MASK, 0x20);
 343 +       else
 344 +               snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
 345 +                WM8741_OSR_MASK, 0x40);
 346 +
 347 +       /* wm8741 bit size */
 348 +       switch (params_width(params)) {
 349 +       case 16:
 350 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 351 +                WM8741_IWL_MASK, 0x00);
 352 +               break;
 353 +       case 20:
 354 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 355 +                WM8741_IWL_MASK, 0x01);
 356 +               break;
 357 +       case 24:
 358 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 359 +                WM8741_IWL_MASK, 0x02);
 360 +               break;
 361 +       case 32:
 362 +               snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
 363 +                WM8741_IWL_MASK, 0x03);
 364 +               break;
 365 +       default:
 366 +               dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
 367 +                       params_width(params));
 368 +               return -EINVAL;
 369 +       }
 370 +
 371 +       return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
 372 +}
 373 +/* machine stream operations */
 374 +static struct snd_soc_ops digidac1_soundcard_ops = {
 375 +       .hw_params      = digidac1_soundcard_hw_params,
 376 +       .startup        = digidac1_soundcard_startup,
 377 +       .shutdown       = digidac1_soundcard_shutdown,
 378 +};
 379 +
 380 +static struct snd_soc_dai_link digidac1_soundcard_dai[] = {
 381 +       {
 382 +       .name           = "RRA DigiDAC1",
 383 +       .stream_name    = "RRA DigiDAC1 HiFi",
 384 +       .cpu_dai_name   = "bcm2708-i2s.0",
 385 +       .codec_dai_name = "wm8804-spdif",
 386 +       .platform_name  = "bcm2708-i2s.0",
 387 +       .codec_name     = "wm8804.1-003b",
 388 +       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 389 +                               SND_SOC_DAIFMT_CBM_CFM,
 390 +       .ops            = &digidac1_soundcard_ops,
 391 +       .init           = digidac1_soundcard_init,
 392 +       },
 393 +       {
 394 +       .name           = "RRA DigiDAC11",
 395 +       .stream_name    = "RRA DigiDAC11 HiFi",
 396 +       .cpu_dai_name   = "wm8804-spdif",
 397 +       .codec_dai_name = "wm8741",
 398 +       .codec_name     = "wm8741.1-001a",
 399 +       .dai_fmt        = SND_SOC_DAIFMT_I2S
 400 +                       | SND_SOC_DAIFMT_NB_NF
 401 +                       | SND_SOC_DAIFMT_CBS_CFS,
 402 +       },
 403 +};
 404 +
 405 +/* audio machine driver */
 406 +static struct snd_soc_card digidac1_soundcard = {
 407 +       .name           = "digidac1-soundcard",
 408 +       .owner          = THIS_MODULE,
 409 +       .dai_link       = digidac1_soundcard_dai,
 410 +       .num_links      = ARRAY_SIZE(digidac1_soundcard_dai),
 411 +};
 412 +
 413 +static int digidac1_soundcard_probe(struct platform_device *pdev)
 414 +{
 415 +       int ret = 0;
 416 +
 417 +       digidac1_soundcard.dev = &pdev->dev;
 418 +
 419 +       if (pdev->dev.of_node) {
 420 +               struct device_node *i2s_node;
 421 +               struct snd_soc_dai_link *dai = &digidac1_soundcard_dai[0];
 422 +
 423 +               i2s_node = of_parse_phandle(pdev->dev.of_node,
 424 +                                       "i2s-controller", 0);
 425 +
 426 +               if (i2s_node) {
 427 +                       dai->cpu_dai_name = NULL;
 428 +                       dai->cpu_of_node = i2s_node;
 429 +                       dai->platform_name = NULL;
 430 +                       dai->platform_of_node = i2s_node;
 431 +               }
 432 +       }
 433 +
 434 +       ret = snd_soc_register_card(&digidac1_soundcard);
 435 +       if (ret)
 436 +               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
 437 +                ret);
 438 +
 439 +       return ret;
 440 +}
 441 +
 442 +static int digidac1_soundcard_remove(struct platform_device *pdev)
 443 +{
 444 +       return snd_soc_unregister_card(&digidac1_soundcard);
 445 +}
 446 +
 447 +static const struct of_device_id digidac1_soundcard_of_match[] = {
 448 +       { .compatible = "rra,digidac1-soundcard", },
 449 +       {},
 450 +};
 451 +MODULE_DEVICE_TABLE(of, digidac1_soundcard_of_match);
 452 +
 453 +static struct platform_driver digidac1_soundcard_driver = {
 454 +       .driver = {
 455 +                       .name           = "digidac1-audio",
 456 +                       .owner          = THIS_MODULE,
 457 +                       .of_match_table = digidac1_soundcard_of_match,
 458 +       },
 459 +       .probe          = digidac1_soundcard_probe,
 460 +       .remove         = digidac1_soundcard_remove,
 461 +};
 462 +
 463 +module_platform_driver(digidac1_soundcard_driver);
 464 +
 465 +MODULE_AUTHOR("José M. Tasende <vintage@redrocksaudio.es>");
 466 +MODULE_DESCRIPTION("ASoC Driver for RRA DigiDAC1");
 467 +MODULE_LICENSE("GPL v2");