sound/soc/codecs/hdac_hda.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright(c) 2015-18 Intel Corporation.
   3
   4 /*
   5  * hdac_hda.c - ASoC extensions to reuse the legacy HDA codec drivers
   6  * with ASoC platform drivers. These APIs are called by the legacy HDA
   7  * codec drivers using hdac_ext_bus_ops ops.
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/delay.h>
  12 #include <linux/module.h>
  13 #include <linux/pm_runtime.h>
  14 #include <sound/pcm_params.h>
  15 #include <sound/soc.h>
  16 #include <sound/hdaudio_ext.h>
  17 #include <sound/hda_i915.h>
  18 #include <sound/hda_codec.h>
  19 #include <sound/hda_register.h>
  20
  21 #include "hdac_hda.h"
  22
  23 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8 | \
  24                         SNDRV_PCM_FMTBIT_U8 | \
  25                         SNDRV_PCM_FMTBIT_S16_LE | \
  26                         SNDRV_PCM_FMTBIT_U16_LE | \
  27                         SNDRV_PCM_FMTBIT_S24_LE | \
  28                         SNDRV_PCM_FMTBIT_U24_LE | \
  29                         SNDRV_PCM_FMTBIT_S32_LE | \
  30                         SNDRV_PCM_FMTBIT_U32_LE | \
  31                         SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
  32
  33 #define STUB_HDMI_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
  34                                  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
  35                                  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |\
  36                                  SNDRV_PCM_RATE_192000)
  37
  38 static int hdac_hda_dai_open(struct snd_pcm_substream *substream,
  39                              struct snd_soc_dai *dai);
  40 static void hdac_hda_dai_close(struct snd_pcm_substream *substream,
  41                                struct snd_soc_dai *dai);
  42 static int hdac_hda_dai_prepare(struct snd_pcm_substream *substream,
  43                                 struct snd_soc_dai *dai);
  44 static int hdac_hda_dai_hw_params(struct snd_pcm_substream *substream,
  45                                   struct snd_pcm_hw_params *params,
  46                                   struct snd_soc_dai *dai);
  47 static int hdac_hda_dai_hw_free(struct snd_pcm_substream *substream,
  48                                 struct snd_soc_dai *dai);
  49 static int hdac_hda_dai_set_tdm_slot(struct snd_soc_dai *dai,
  50                                      unsigned int tx_mask, unsigned int rx_mask,
  51                                      int slots, int slot_width);
  52 static struct hda_pcm *snd_soc_find_pcm_from_dai(struct hdac_hda_priv *hda_pvt,
  53                                                  struct snd_soc_dai *dai);
  54
  55 static const struct snd_soc_dai_ops hdac_hda_dai_ops = {
  56         .startup = hdac_hda_dai_open,
  57         .shutdown = hdac_hda_dai_close,
  58         .prepare = hdac_hda_dai_prepare,
  59         .hw_params = hdac_hda_dai_hw_params,
  60         .hw_free = hdac_hda_dai_hw_free,
  61         .set_tdm_slot = hdac_hda_dai_set_tdm_slot,
  62 };
  63
  64 static struct snd_soc_dai_driver hdac_hda_dais[] = {
  65 {
  66         .id = HDAC_ANALOG_DAI_ID,
  67         .name = "Analog Codec DAI",
  68         .ops = &hdac_hda_dai_ops,
  69         .playback = {
  70                 .stream_name    = "Analog Codec Playback",
  71                 .channels_min   = 1,
  72                 .channels_max   = 16,
  73                 .rates          = SNDRV_PCM_RATE_8000_192000,
  74                 .formats        = STUB_FORMATS,
  75                 .sig_bits       = 24,
  76         },
  77         .capture = {
  78                 .stream_name    = "Analog Codec Capture",
  79                 .channels_min   = 1,
  80                 .channels_max   = 16,
  81                 .rates = SNDRV_PCM_RATE_8000_192000,
  82                 .formats = STUB_FORMATS,
  83                 .sig_bits = 24,
  84         },
  85 },
  86 {
  87         .id = HDAC_DIGITAL_DAI_ID,
  88         .name = "Digital Codec DAI",
  89         .ops = &hdac_hda_dai_ops,
  90         .playback = {
  91                 .stream_name    = "Digital Codec Playback",
  92                 .channels_min   = 1,
  93                 .channels_max   = 16,
  94                 .rates          = SNDRV_PCM_RATE_8000_192000,
  95                 .formats        = STUB_FORMATS,
  96                 .sig_bits = 24,
  97         },
  98         .capture = {
  99                 .stream_name    = "Digital Codec Capture",
 100                 .channels_min   = 1,
 101                 .channels_max   = 16,
 102                 .rates = SNDRV_PCM_RATE_8000_192000,
 103                 .formats = STUB_FORMATS,
 104                 .sig_bits = 24,
 105         },
 106 },
 107 {
 108         .id = HDAC_ALT_ANALOG_DAI_ID,
 109         .name = "Alt Analog Codec DAI",
 110         .ops = &hdac_hda_dai_ops,
 111         .playback = {
 112                 .stream_name    = "Alt Analog Codec Playback",
 113                 .channels_min   = 1,
 114                 .channels_max   = 16,
 115                 .rates          = SNDRV_PCM_RATE_8000_192000,
 116                 .formats        = STUB_FORMATS,
 117                 .sig_bits       = 24,
 118         },
 119         .capture = {
 120                 .stream_name    = "Alt Analog Codec Capture",
 121                 .channels_min   = 1,
 122                 .channels_max   = 16,
 123                 .rates = SNDRV_PCM_RATE_8000_192000,
 124                 .formats = STUB_FORMATS,
 125                 .sig_bits = 24,
 126         },
 127 },
 128 {
 129         .id = HDAC_HDMI_0_DAI_ID,
 130         .name = "intel-hdmi-hifi1",
 131         .ops = &hdac_hda_dai_ops,
 132         .playback = {
 133                 .stream_name    = "hifi1",
 134                 .channels_min   = 1,
 135                 .channels_max   = 32,
 136                 .rates          = STUB_HDMI_RATES,
 137                 .formats        = STUB_FORMATS,
 138                 .sig_bits = 24,
 139         },
 140 },
 141 {
 142         .id = HDAC_HDMI_1_DAI_ID,
 143         .name = "intel-hdmi-hifi2",
 144         .ops = &hdac_hda_dai_ops,
 145         .playback = {
 146                 .stream_name    = "hifi2",
 147                 .channels_min   = 1,
 148                 .channels_max   = 32,
 149                 .rates          = STUB_HDMI_RATES,
 150                 .formats        = STUB_FORMATS,
 151                 .sig_bits = 24,
 152         },
 153 },
 154 {
 155         .id = HDAC_HDMI_2_DAI_ID,
 156         .name = "intel-hdmi-hifi3",
 157         .ops = &hdac_hda_dai_ops,
 158         .playback = {
 159                 .stream_name    = "hifi3",
 160                 .channels_min   = 1,
 161                 .channels_max   = 32,
 162                 .rates          = STUB_HDMI_RATES,
 163                 .formats        = STUB_FORMATS,
 164                 .sig_bits = 24,
 165         },
 166 },
 167 {
 168         .id = HDAC_HDMI_3_DAI_ID,
 169         .name = "intel-hdmi-hifi4",
 170         .ops = &hdac_hda_dai_ops,
 171         .playback = {
 172                 .stream_name    = "hifi4",
 173                 .channels_min   = 1,
 174                 .channels_max   = 32,
 175                 .rates          = STUB_HDMI_RATES,
 176                 .formats        = STUB_FORMATS,
 177                 .sig_bits = 24,
 178         },
 179 },
 180
 181 };
 182
 183 static int hdac_hda_dai_set_tdm_slot(struct snd_soc_dai *dai,
 184                                      unsigned int tx_mask, unsigned int rx_mask,
 185                                      int slots, int slot_width)
 186 {
 187         struct snd_soc_component *component = dai->component;
 188         struct hdac_hda_priv *hda_pvt;
 189         struct hdac_hda_pcm *pcm;
 190
 191         hda_pvt = snd_soc_component_get_drvdata(component);
 192         pcm = &hda_pvt->pcm[dai->id];
 193
 194         if (tx_mask)
 195                 pcm->stream_tag[SNDRV_PCM_STREAM_PLAYBACK] = tx_mask;
 196         else
 197                 pcm->stream_tag[SNDRV_PCM_STREAM_CAPTURE] = rx_mask;
 198
 199         return 0;
 200 }
 201
 202 static int hdac_hda_dai_hw_params(struct snd_pcm_substream *substream,
 203                                   struct snd_pcm_hw_params *params,
 204                                   struct snd_soc_dai *dai)
 205 {
 206         struct snd_soc_component *component = dai->component;
 207         struct hdac_hda_priv *hda_pvt;
 208         unsigned int format_val;
 209         unsigned int maxbps;
 210
 211         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 212                 maxbps = dai->driver->playback.sig_bits;
 213         else
 214                 maxbps = dai->driver->capture.sig_bits;
 215
 216         hda_pvt = snd_soc_component_get_drvdata(component);
 217         format_val = snd_hdac_calc_stream_format(params_rate(params),
 218                                                  params_channels(params),
 219                                                  params_format(params),
 220                                                  maxbps,
 221                                                  0);
 222         if (!format_val) {
 223                 dev_err(dai->dev,
 224                         "invalid format_val, rate=%d, ch=%d, format=%d, maxbps=%d\n",
 225                         params_rate(params), params_channels(params),
 226                         params_format(params), maxbps);
 227
 228                 return -EINVAL;
 229         }
 230
 231         hda_pvt->pcm[dai->id].format_val[substream->stream] = format_val;
 232         return 0;
 233 }
 234
 235 static int hdac_hda_dai_hw_free(struct snd_pcm_substream *substream,
 236                                 struct snd_soc_dai *dai)
 237 {
 238         struct snd_soc_component *component = dai->component;
 239         struct hdac_hda_priv *hda_pvt;
 240         struct hda_pcm_stream *hda_stream;
 241         struct hda_pcm *pcm;
 242
 243         hda_pvt = snd_soc_component_get_drvdata(component);
 244         pcm = snd_soc_find_pcm_from_dai(hda_pvt, dai);
 245         if (!pcm)
 246                 return -EINVAL;
 247
 248         hda_stream = &pcm->stream[substream->stream];
 249         snd_hda_codec_cleanup(&hda_pvt->codec, hda_stream, substream);
 250
 251         return 0;
 252 }
 253
 254 static int hdac_hda_dai_prepare(struct snd_pcm_substream *substream,
 255                                 struct snd_soc_dai *dai)
 256 {
 257         struct snd_soc_component *component = dai->component;
 258         struct hda_pcm_stream *hda_stream;
 259         struct hdac_hda_priv *hda_pvt;
 260         struct hdac_device *hdev;
 261         unsigned int format_val;
 262         struct hda_pcm *pcm;
 263         unsigned int stream;
 264         int ret = 0;
 265
 266         hda_pvt = snd_soc_component_get_drvdata(component);
 267         hdev = &hda_pvt->codec.core;
 268         pcm = snd_soc_find_pcm_from_dai(hda_pvt, dai);
 269         if (!pcm)
 270                 return -EINVAL;
 271
 272         hda_stream = &pcm->stream[substream->stream];
 273
 274         stream = hda_pvt->pcm[dai->id].stream_tag[substream->stream];
 275         format_val = hda_pvt->pcm[dai->id].format_val[substream->stream];
 276
 277         ret = snd_hda_codec_prepare(&hda_pvt->codec, hda_stream,
 278                                     stream, format_val, substream);
 279         if (ret < 0)
 280                 dev_err(&hdev->dev, "codec prepare failed %d\n", ret);
 281
 282         return ret;
 283 }
 284
 285 static int hdac_hda_dai_open(struct snd_pcm_substream *substream,
 286                              struct snd_soc_dai *dai)
 287 {
 288         struct snd_soc_component *component = dai->component;
 289         struct hdac_hda_priv *hda_pvt;
 290         struct hda_pcm_stream *hda_stream;
 291         struct hda_pcm *pcm;
 292
 293         hda_pvt = snd_soc_component_get_drvdata(component);
 294         pcm = snd_soc_find_pcm_from_dai(hda_pvt, dai);
 295         if (!pcm)
 296                 return -EINVAL;
 297
 298         snd_hda_codec_pcm_get(pcm);
 299
 300         hda_stream = &pcm->stream[substream->stream];
 301
 302         return hda_stream->ops.open(hda_stream, &hda_pvt->codec, substream);
 303 }
 304
 305 static void hdac_hda_dai_close(struct snd_pcm_substream *substream,
 306                                struct snd_soc_dai *dai)
 307 {
 308         struct snd_soc_component *component = dai->component;
 309         struct hdac_hda_priv *hda_pvt;
 310         struct hda_pcm_stream *hda_stream;
 311         struct hda_pcm *pcm;
 312
 313         hda_pvt = snd_soc_component_get_drvdata(component);
 314         pcm = snd_soc_find_pcm_from_dai(hda_pvt, dai);
 315         if (!pcm)
 316                 return;
 317
 318         hda_stream = &pcm->stream[substream->stream];
 319
 320         hda_stream->ops.close(hda_stream, &hda_pvt->codec, substream);
 321
 322         snd_hda_codec_pcm_put(pcm);
 323 }
 324
 325 static struct hda_pcm *snd_soc_find_pcm_from_dai(struct hdac_hda_priv *hda_pvt,
 326                                                  struct snd_soc_dai *dai)
 327 {
 328         struct hda_codec *hcodec = &hda_pvt->codec;
 329         struct hda_pcm *cpcm;
 330         const char *pcm_name;
 331
 332         /*
 333          * map DAI ID to the closest matching PCM name, using the naming
 334          * scheme used by hda-codec snd_hda_gen_build_pcms() and for
 335          * HDMI in hda_codec patch_hdmi.c)
 336          */
 337
 338         switch (dai->id) {
 339         case HDAC_ANALOG_DAI_ID:
 340                 pcm_name = "Analog";
 341                 break;
 342         case HDAC_DIGITAL_DAI_ID:
 343                 pcm_name = "Digital";
 344                 break;
 345         case HDAC_ALT_ANALOG_DAI_ID:
 346                 pcm_name = "Alt Analog";
 347                 break;
 348         case HDAC_HDMI_0_DAI_ID:
 349                 pcm_name = "HDMI 0";
 350                 break;
 351         case HDAC_HDMI_1_DAI_ID:
 352                 pcm_name = "HDMI 1";
 353                 break;
 354         case HDAC_HDMI_2_DAI_ID:
 355                 pcm_name = "HDMI 2";
 356                 break;
 357         case HDAC_HDMI_3_DAI_ID:
 358                 pcm_name = "HDMI 3";
 359                 break;
 360         default:
 361                 dev_err(&hcodec->core.dev, "invalid dai id %d\n", dai->id);
 362                 return NULL;
 363         }
 364
 365         list_for_each_entry(cpcm, &hcodec->pcm_list_head, list) {
 366                 if (strstr(cpcm->name, pcm_name))
 367                         return cpcm;
 368         }
 369
 370         dev_err(&hcodec->core.dev, "didn't find PCM for DAI %s\n", dai->name);
 371         return NULL;
 372 }
 373
 374 static bool is_hdmi_codec(struct hda_codec *hcodec)
 375 {
 376         struct hda_pcm *cpcm;
 377
 378         list_for_each_entry(cpcm, &hcodec->pcm_list_head, list) {
 379                 if (cpcm->pcm_type == HDA_PCM_TYPE_HDMI)
 380                         return true;
 381         }
 382
 383         return false;
 384 }
 385
 386 static int hdac_hda_codec_probe(struct snd_soc_component *component)
 387 {
 388         struct hdac_hda_priv *hda_pvt =
 389                         snd_soc_component_get_drvdata(component);
 390         struct snd_soc_dapm_context *dapm =
 391                         snd_soc_component_get_dapm(component);
 392         struct hdac_device *hdev = &hda_pvt->codec.core;
 393         struct hda_codec *hcodec = &hda_pvt->codec;
 394         struct hdac_ext_link *hlink;
 395         hda_codec_patch_t patch;
 396         int ret;
 397
 398         hlink = snd_hdac_ext_bus_get_link(hdev->bus, dev_name(&hdev->dev));
 399         if (!hlink) {
 400                 dev_err(&hdev->dev, "hdac link not found\n");
 401                 return -EIO;
 402         }
 403
 404         snd_hdac_ext_bus_link_get(hdev->bus, hlink);
 405
 406         /*
 407          * Ensure any HDA display is powered at codec probe.
 408          * After snd_hda_codec_device_new(), display power is
 409          * managed by runtime PM.
 410          */
 411         if (hda_pvt->need_display_power)
 412                 snd_hdac_display_power(hdev->bus,
 413                                        HDA_CODEC_IDX_CONTROLLER, true);
 414
 415         ret = snd_hda_codec_device_new(hcodec->bus, component->card->snd_card,
 416                                        hdev->addr, hcodec);
 417         if (ret < 0) {
 418                 dev_err(&hdev->dev, "failed to create hda codec %d\n", ret);
 419                 goto error_no_pm;
 420         }
 421         /*
 422          * Overwrite type to HDA_DEV_ASOC since it is a ASoC driver
 423          * hda_codec.c will check this flag to determine if unregister
 424          * device is needed.
 425          */
 426         hdev->type = HDA_DEV_ASOC;
 427
 428         /*
 429          * snd_hda_codec_device_new decrements the usage count so call get pm
 430          * else the device will be powered off
 431          */
 432         pm_runtime_get_noresume(&hdev->dev);
 433
 434         hcodec->bus->card = dapm->card->snd_card;
 435
 436         ret = snd_hda_codec_set_name(hcodec, hcodec->preset->name);
 437         if (ret < 0) {
 438                 dev_err(&hdev->dev, "name failed %s\n", hcodec->preset->name);
 439                 goto error_pm;
 440         }
 441
 442         ret = snd_hdac_regmap_init(&hcodec->core);
 443         if (ret < 0) {
 444                 dev_err(&hdev->dev, "regmap init failed\n");
 445                 goto error_pm;
 446         }
 447
 448         patch = (hda_codec_patch_t)hcodec->preset->driver_data;
 449         if (patch) {
 450                 ret = patch(hcodec);
 451                 if (ret < 0) {
 452                         dev_err(&hdev->dev, "patch failed %d\n", ret);
 453                         goto error_regmap;
 454                 }
 455         } else {
 456                 dev_dbg(&hdev->dev, "no patch file found\n");
 457         }
 458
 459         /* configure codec for 1:1 PCM:DAI mapping */
 460         hcodec->mst_no_extra_pcms = 1;
 461
 462         ret = snd_hda_codec_parse_pcms(hcodec);
 463         if (ret < 0) {
 464                 dev_err(&hdev->dev, "unable to map pcms to dai %d\n", ret);
 465                 goto error_patch;
 466         }
 467
 468         /* HDMI controls need to be created in machine drivers */
 469         if (!is_hdmi_codec(hcodec)) {
 470                 ret = snd_hda_codec_build_controls(hcodec);
 471                 if (ret < 0) {
 472                         dev_err(&hdev->dev, "unable to create controls %d\n",
 473                                 ret);
 474                         goto error_patch;
 475                 }
 476         }
 477
 478         hcodec->core.lazy_cache = true;
 479
 480         if (hda_pvt->need_display_power)
 481                 snd_hdac_display_power(hdev->bus,
 482                                        HDA_CODEC_IDX_CONTROLLER, false);
 483
 484         /* match for forbid call in snd_hda_codec_device_new() */
 485         pm_runtime_allow(&hdev->dev);
 486
 487         /*
 488          * hdac_device core already sets the state to active and calls
 489          * get_noresume. So enable runtime and set the device to suspend.
 490          * pm_runtime_enable is also called during codec registeration
 491          */
 492         pm_runtime_put(&hdev->dev);
 493         pm_runtime_suspend(&hdev->dev);
 494
 495         return 0;
 496
 497 error_patch:
 498         if (hcodec->patch_ops.free)
 499                 hcodec->patch_ops.free(hcodec);
 500 error_regmap:
 501         snd_hdac_regmap_exit(hdev);
 502 error_pm:
 503         pm_runtime_put(&hdev->dev);
 504 error_no_pm:
 505         snd_hdac_ext_bus_link_put(hdev->bus, hlink);
 506         return ret;
 507 }
 508
 509 static void hdac_hda_codec_remove(struct snd_soc_component *component)
 510 {
 511         struct hdac_hda_priv *hda_pvt =
 512                       snd_soc_component_get_drvdata(component);
 513         struct hdac_device *hdev = &hda_pvt->codec.core;
 514         struct hda_codec *codec = &hda_pvt->codec;
 515         struct hdac_ext_link *hlink = NULL;
 516
 517         hlink = snd_hdac_ext_bus_get_link(hdev->bus, dev_name(&hdev->dev));
 518         if (!hlink) {
 519                 dev_err(&hdev->dev, "hdac link not found\n");
 520                 return;
 521         }
 522
 523         pm_runtime_disable(&hdev->dev);
 524         snd_hdac_ext_bus_link_put(hdev->bus, hlink);
 525
 526         if (codec->patch_ops.free)
 527                 codec->patch_ops.free(codec);
 528
 529         snd_hda_codec_cleanup_for_unbind(codec);
 530 }
 531
 532 static const struct snd_soc_dapm_route hdac_hda_dapm_routes[] = {
 533         {"AIF1TX", NULL, "Codec Input Pin1"},
 534         {"AIF2TX", NULL, "Codec Input Pin2"},
 535         {"AIF3TX", NULL, "Codec Input Pin3"},
 536
 537         {"Codec Output Pin1", NULL, "AIF1RX"},
 538         {"Codec Output Pin2", NULL, "AIF2RX"},
 539         {"Codec Output Pin3", NULL, "AIF3RX"},
 540 };
 541
 542 static const struct snd_soc_dapm_widget hdac_hda_dapm_widgets[] = {
 543         /* Audio Interface */
 544         SND_SOC_DAPM_AIF_IN("AIF1RX", "Analog Codec Playback", 0,
 545                             SND_SOC_NOPM, 0, 0),
 546         SND_SOC_DAPM_AIF_IN("AIF2RX", "Digital Codec Playback", 0,
 547                             SND_SOC_NOPM, 0, 0),
 548         SND_SOC_DAPM_AIF_IN("AIF3RX", "Alt Analog Codec Playback", 0,
 549                             SND_SOC_NOPM, 0, 0),
 550         SND_SOC_DAPM_AIF_OUT("AIF1TX", "Analog Codec Capture", 0,
 551                              SND_SOC_NOPM, 0, 0),
 552         SND_SOC_DAPM_AIF_OUT("AIF2TX", "Digital Codec Capture", 0,
 553                              SND_SOC_NOPM, 0, 0),
 554         SND_SOC_DAPM_AIF_OUT("AIF3TX", "Alt Analog Codec Capture", 0,
 555                              SND_SOC_NOPM, 0, 0),
 556
 557         /* Input Pins */
 558         SND_SOC_DAPM_INPUT("Codec Input Pin1"),
 559         SND_SOC_DAPM_INPUT("Codec Input Pin2"),
 560         SND_SOC_DAPM_INPUT("Codec Input Pin3"),
 561
 562         /* Output Pins */
 563         SND_SOC_DAPM_OUTPUT("Codec Output Pin1"),
 564         SND_SOC_DAPM_OUTPUT("Codec Output Pin2"),
 565         SND_SOC_DAPM_OUTPUT("Codec Output Pin3"),
 566 };
 567
 568 static const struct snd_soc_component_driver hdac_hda_codec = {
 569         .probe          = hdac_hda_codec_probe,
 570         .remove         = hdac_hda_codec_remove,
 571         .idle_bias_on   = false,
 572         .dapm_widgets           = hdac_hda_dapm_widgets,
 573         .num_dapm_widgets       = ARRAY_SIZE(hdac_hda_dapm_widgets),
 574         .dapm_routes            = hdac_hda_dapm_routes,
 575         .num_dapm_routes        = ARRAY_SIZE(hdac_hda_dapm_routes),
 576 };
 577
 578 static int hdac_hda_dev_probe(struct hdac_device *hdev)
 579 {
 580         struct hdac_ext_link *hlink;
 581         struct hdac_hda_priv *hda_pvt;
 582         int ret;
 583
 584         /* hold the ref while we probe */
 585         hlink = snd_hdac_ext_bus_get_link(hdev->bus, dev_name(&hdev->dev));
 586         if (!hlink) {
 587                 dev_err(&hdev->dev, "hdac link not found\n");
 588                 return -EIO;
 589         }
 590         snd_hdac_ext_bus_link_get(hdev->bus, hlink);
 591
 592         hda_pvt = hdac_to_hda_priv(hdev);
 593         if (!hda_pvt)
 594                 return -ENOMEM;
 595
 596         /* ASoC specific initialization */
 597         ret = devm_snd_soc_register_component(&hdev->dev,
 598                                          &hdac_hda_codec, hdac_hda_dais,
 599                                          ARRAY_SIZE(hdac_hda_dais));
 600         if (ret < 0) {
 601                 dev_err(&hdev->dev, "failed to register HDA codec %d\n", ret);
 602                 return ret;
 603         }
 604
 605         dev_set_drvdata(&hdev->dev, hda_pvt);
 606         snd_hdac_ext_bus_link_put(hdev->bus, hlink);
 607
 608         return ret;
 609 }
 610
 611 static int hdac_hda_dev_remove(struct hdac_device *hdev)
 612 {
 613         /*
 614          * Resources are freed in hdac_hda_codec_remove(). This
 615          * function is kept to keep hda_codec_driver_remove() happy.
 616          */
 617         return 0;
 618 }
 619
 620 static struct hdac_ext_bus_ops hdac_ops = {
 621         .hdev_attach = hdac_hda_dev_probe,
 622         .hdev_detach = hdac_hda_dev_remove,
 623 };
 624
 625 struct hdac_ext_bus_ops *snd_soc_hdac_hda_get_ops(void)
 626 {
 627         return &hdac_ops;
 628 }
 629 EXPORT_SYMBOL_GPL(snd_soc_hdac_hda_get_ops);
 630
 631 MODULE_LICENSE("GPL v2");
 632 MODULE_DESCRIPTION("ASoC Extensions for legacy HDA Drivers");
 633 MODULE_AUTHOR("Rakesh Ughreja<rakesh.a.ughreja@intel.com>");