sound/soc/codecs/hdmi-codec.c

   1 /*
   2  * ALSA SoC codec for HDMI encoder drivers
   3  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
   4  * Author: Jyri Sarha <jsarha@ti.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  */
  15 #include <linux/module.h>
  16 #include <linux/string.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/soc.h>
  21 #include <sound/pcm_drm_eld.h>
  22 #include <sound/hdmi-codec.h>
  23 #include <sound/pcm_iec958.h>
  24
  25 #include <drm/drm_crtc.h> /* This is only to get MAX_ELD_BYTES */
  26
  27 struct hdmi_device {
  28         struct device *dev;
  29         struct list_head list;
  30         int cnt;
  31 };
  32 #define pos_to_hdmi_device(pos) container_of((pos), struct hdmi_device, list)
  33 LIST_HEAD(hdmi_device_list);
  34
  35 #define DAI_NAME_SIZE 16
  36 struct hdmi_codec_priv {
  37         struct hdmi_codec_pdata hcd;
  38         struct snd_soc_dai_driver *daidrv;
  39         struct hdmi_codec_daifmt daifmt[2];
  40         struct mutex current_stream_lock;
  41         struct snd_pcm_substream *current_stream;
  42         struct snd_pcm_hw_constraint_list ratec;
  43         uint8_t eld[MAX_ELD_BYTES];
  44 };
  45
  46 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
  47         SND_SOC_DAPM_OUTPUT("TX"),
  48 };
  49
  50 static const struct snd_soc_dapm_route hdmi_routes[] = {
  51         { "TX", NULL, "Playback" },
  52 };
  53
  54 enum {
  55         DAI_ID_I2S = 0,
  56         DAI_ID_SPDIF,
  57 };
  58
  59 static int hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol,
  60                              struct snd_ctl_elem_info *uinfo)
  61 {
  62         struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
  63         struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
  64
  65         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
  66         uinfo->count = sizeof(hcp->eld);
  67
  68         return 0;
  69 }
  70
  71 static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
  72                             struct snd_ctl_elem_value *ucontrol)
  73 {
  74         struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
  75         struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
  76
  77         memcpy(ucontrol->value.bytes.data, hcp->eld, sizeof(hcp->eld));
  78
  79         return 0;
  80 }
  81
  82 static const struct snd_kcontrol_new hdmi_controls[] = {
  83         {
  84                 .access = SNDRV_CTL_ELEM_ACCESS_READ |
  85                           SNDRV_CTL_ELEM_ACCESS_VOLATILE,
  86                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  87                 .name = "ELD",
  88                 .info = hdmi_eld_ctl_info,
  89                 .get = hdmi_eld_ctl_get,
  90         },
  91 };
  92
  93 static int hdmi_codec_new_stream(struct snd_pcm_substream *substream,
  94                                  struct snd_soc_dai *dai)
  95 {
  96         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
  97         int ret = 0;
  98
  99         mutex_lock(&hcp->current_stream_lock);
 100         if (!hcp->current_stream) {
 101                 hcp->current_stream = substream;
 102         } else if (hcp->current_stream != substream) {
 103                 dev_err(dai->dev, "Only one simultaneous stream supported!\n");
 104                 ret = -EINVAL;
 105         }
 106         mutex_unlock(&hcp->current_stream_lock);
 107
 108         return ret;
 109 }
 110
 111 static int hdmi_codec_startup(struct snd_pcm_substream *substream,
 112                               struct snd_soc_dai *dai)
 113 {
 114         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 115         int ret = 0;
 116
 117         dev_dbg(dai->dev, "%s()\n", __func__);
 118
 119         ret = hdmi_codec_new_stream(substream, dai);
 120         if (ret)
 121                 return ret;
 122
 123         if (hcp->hcd.ops->audio_startup) {
 124                 ret = hcp->hcd.ops->audio_startup(dai->dev->parent, hcp->hcd.data);
 125                 if (ret) {
 126                         mutex_lock(&hcp->current_stream_lock);
 127                         hcp->current_stream = NULL;
 128                         mutex_unlock(&hcp->current_stream_lock);
 129                         return ret;
 130                 }
 131         }
 132
 133         if (hcp->hcd.ops->get_eld) {
 134                 ret = hcp->hcd.ops->get_eld(dai->dev->parent, hcp->hcd.data,
 135                                             hcp->eld, sizeof(hcp->eld));
 136
 137                 if (!ret) {
 138                         ret = snd_pcm_hw_constraint_eld(substream->runtime,
 139                                                         hcp->eld);
 140                         if (ret)
 141                                 return ret;
 142                 }
 143         }
 144         return 0;
 145 }
 146
 147 static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
 148                                 struct snd_soc_dai *dai)
 149 {
 150         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 151
 152         dev_dbg(dai->dev, "%s()\n", __func__);
 153
 154         WARN_ON(hcp->current_stream != substream);
 155
 156         hcp->hcd.ops->audio_shutdown(dai->dev->parent, hcp->hcd.data);
 157
 158         mutex_lock(&hcp->current_stream_lock);
 159         hcp->current_stream = NULL;
 160         mutex_unlock(&hcp->current_stream_lock);
 161 }
 162
 163 static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
 164                                 struct snd_pcm_hw_params *params,
 165                                 struct snd_soc_dai *dai)
 166 {
 167         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 168         struct hdmi_codec_params hp = {
 169                 .iec = {
 170                         .status = { 0 },
 171                         .subcode = { 0 },
 172                         .pad = 0,
 173                         .dig_subframe = { 0 },
 174                 }
 175         };
 176         int ret;
 177
 178         dev_dbg(dai->dev, "%s() width %d rate %d channels %d\n", __func__,
 179                 params_width(params), params_rate(params),
 180                 params_channels(params));
 181
 182         if (params_width(params) > 24)
 183                 params->msbits = 24;
 184
 185         ret = snd_pcm_create_iec958_consumer_hw_params(params, hp.iec.status,
 186                                                        sizeof(hp.iec.status));
 187         if (ret < 0) {
 188                 dev_err(dai->dev, "Creating IEC958 channel status failed %d\n",
 189                         ret);
 190                 return ret;
 191         }
 192
 193         ret = hdmi_codec_new_stream(substream, dai);
 194         if (ret)
 195                 return ret;
 196
 197         hdmi_audio_infoframe_init(&hp.cea);
 198         hp.cea.channels = params_channels(params);
 199         hp.cea.coding_type = HDMI_AUDIO_CODING_TYPE_STREAM;
 200         hp.cea.sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM;
 201         hp.cea.sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM;
 202
 203         hp.sample_width = params_width(params);
 204         hp.sample_rate = params_rate(params);
 205         hp.channels = params_channels(params);
 206
 207         return hcp->hcd.ops->hw_params(dai->dev->parent, hcp->hcd.data,
 208                                        &hcp->daifmt[dai->id], &hp);
 209 }
 210
 211 static int hdmi_codec_set_fmt(struct snd_soc_dai *dai,
 212                               unsigned int fmt)
 213 {
 214         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 215         struct hdmi_codec_daifmt cf = { 0 };
 216         int ret = 0;
 217
 218         dev_dbg(dai->dev, "%s()\n", __func__);
 219
 220         if (dai->id == DAI_ID_SPDIF) {
 221                 cf.fmt = HDMI_SPDIF;
 222         } else {
 223                 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 224                 case SND_SOC_DAIFMT_CBM_CFM:
 225                         cf.bit_clk_master = 1;
 226                         cf.frame_clk_master = 1;
 227                         break;
 228                 case SND_SOC_DAIFMT_CBS_CFM:
 229                         cf.frame_clk_master = 1;
 230                         break;
 231                 case SND_SOC_DAIFMT_CBM_CFS:
 232                         cf.bit_clk_master = 1;
 233                         break;
 234                 case SND_SOC_DAIFMT_CBS_CFS:
 235                         break;
 236                 default:
 237                         return -EINVAL;
 238                 }
 239
 240                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 241                 case SND_SOC_DAIFMT_NB_NF:
 242                         break;
 243                 case SND_SOC_DAIFMT_NB_IF:
 244                         cf.frame_clk_inv = 1;
 245                         break;
 246                 case SND_SOC_DAIFMT_IB_NF:
 247                         cf.bit_clk_inv = 1;
 248                         break;
 249                 case SND_SOC_DAIFMT_IB_IF:
 250                         cf.frame_clk_inv = 1;
 251                         cf.bit_clk_inv = 1;
 252                         break;
 253                 }
 254
 255                 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 256                 case SND_SOC_DAIFMT_I2S:
 257                         cf.fmt = HDMI_I2S;
 258                         break;
 259                 case SND_SOC_DAIFMT_DSP_A:
 260                         cf.fmt = HDMI_DSP_A;
 261                         break;
 262                 case SND_SOC_DAIFMT_DSP_B:
 263                         cf.fmt = HDMI_DSP_B;
 264                         break;
 265                 case SND_SOC_DAIFMT_RIGHT_J:
 266                         cf.fmt = HDMI_RIGHT_J;
 267                         break;
 268                 case SND_SOC_DAIFMT_LEFT_J:
 269                         cf.fmt = HDMI_LEFT_J;
 270                         break;
 271                 case SND_SOC_DAIFMT_AC97:
 272                         cf.fmt = HDMI_AC97;
 273                         break;
 274                 default:
 275                         dev_err(dai->dev, "Invalid DAI interface format\n");
 276                         return -EINVAL;
 277                 }
 278         }
 279
 280         hcp->daifmt[dai->id] = cf;
 281
 282         return ret;
 283 }
 284
 285 static int hdmi_codec_digital_mute(struct snd_soc_dai *dai, int mute)
 286 {
 287         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 288
 289         dev_dbg(dai->dev, "%s()\n", __func__);
 290
 291         if (hcp->hcd.ops->digital_mute)
 292                 return hcp->hcd.ops->digital_mute(dai->dev->parent,
 293                                                   hcp->hcd.data, mute);
 294
 295         return 0;
 296 }
 297
 298 static const struct snd_soc_dai_ops hdmi_dai_ops = {
 299         .startup        = hdmi_codec_startup,
 300         .shutdown       = hdmi_codec_shutdown,
 301         .hw_params      = hdmi_codec_hw_params,
 302         .set_fmt        = hdmi_codec_set_fmt,
 303         .digital_mute   = hdmi_codec_digital_mute,
 304 };
 305
 306
 307 #define HDMI_RATES      (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 308                          SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 309                          SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |\
 310                          SNDRV_PCM_RATE_192000)
 311
 312 #define SPDIF_FORMATS   (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
 313                          SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
 314                          SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
 315                          SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
 316
 317 /*
 318  * This list is only for formats allowed on the I2S bus. So there is
 319  * some formats listed that are not supported by HDMI interface. For
 320  * instance allowing the 32-bit formats enables 24-precision with CPU
 321  * DAIs that do not support 24-bit formats. If the extra formats cause
 322  * problems, we should add the video side driver an option to disable
 323  * them.
 324  */
 325 #define I2S_FORMATS     (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
 326                          SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
 327                          SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
 328                          SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |\
 329                          SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE)
 330
 331 static struct snd_soc_dai_driver hdmi_i2s_dai = {
 332         .id = DAI_ID_I2S,
 333         .playback = {
 334                 .stream_name = "Playback",
 335                 .channels_min = 2,
 336                 .channels_max = 8,
 337                 .rates = HDMI_RATES,
 338                 .formats = I2S_FORMATS,
 339                 .sig_bits = 24,
 340         },
 341         .ops = &hdmi_dai_ops,
 342 };
 343
 344 static const struct snd_soc_dai_driver hdmi_spdif_dai = {
 345         .id = DAI_ID_SPDIF,
 346         .playback = {
 347                 .stream_name = "Playback",
 348                 .channels_min = 2,
 349                 .channels_max = 2,
 350                 .rates = HDMI_RATES,
 351                 .formats = SPDIF_FORMATS,
 352         },
 353         .ops = &hdmi_dai_ops,
 354 };
 355
 356 static char hdmi_dai_name[][DAI_NAME_SIZE] = {
 357         "hdmi-hifi.0",
 358         "hdmi-hifi.1",
 359         "hdmi-hifi.2",
 360         "hdmi-hifi.3",
 361 };
 362
 363 static int hdmi_of_xlate_dai_name(struct snd_soc_component *component,
 364                                   struct of_phandle_args *args,
 365                                   const char **dai_name)
 366 {
 367         int id;
 368
 369         if (args->args_count)
 370                 id = args->args[0];
 371         else
 372                 id = 0;
 373
 374         if (id < ARRAY_SIZE(hdmi_dai_name)) {
 375                 *dai_name = hdmi_dai_name[id];
 376                 return 0;
 377         }
 378
 379         return -EAGAIN;
 380 }
 381
 382 static struct snd_soc_codec_driver hdmi_codec = {
 383         .component_driver = {
 384                 .controls               = hdmi_controls,
 385                 .num_controls           = ARRAY_SIZE(hdmi_controls),
 386                 .dapm_widgets           = hdmi_widgets,
 387                 .num_dapm_widgets       = ARRAY_SIZE(hdmi_widgets),
 388                 .dapm_routes            = hdmi_routes,
 389                 .num_dapm_routes        = ARRAY_SIZE(hdmi_routes),
 390                 .of_xlate_dai_name      = hdmi_of_xlate_dai_name,
 391         },
 392 };
 393
 394 static int hdmi_codec_probe(struct platform_device *pdev)
 395 {
 396         struct hdmi_codec_pdata *hcd = pdev->dev.platform_data;
 397         struct device *dev = &pdev->dev;
 398         struct hdmi_codec_priv *hcp;
 399         struct hdmi_device *hd;
 400         struct list_head *pos;
 401         int dai_count, i = 0;
 402         int ret;
 403
 404         dev_dbg(dev, "%s()\n", __func__);
 405
 406         if (!hcd) {
 407                 dev_err(dev, "%s: No plalform data\n", __func__);
 408                 return -EINVAL;
 409         }
 410
 411         dai_count = hcd->i2s + hcd->spdif;
 412         if (dai_count < 1 || !hcd->ops || !hcd->ops->hw_params ||
 413             !hcd->ops->audio_shutdown) {
 414                 dev_err(dev, "%s: Invalid parameters\n", __func__);
 415                 return -EINVAL;
 416         }
 417
 418         hcp = devm_kzalloc(dev, sizeof(*hcp), GFP_KERNEL);
 419         if (!hcp)
 420                 return -ENOMEM;
 421
 422         hd = NULL;
 423         list_for_each(pos, &hdmi_device_list) {
 424                 struct hdmi_device *tmp = pos_to_hdmi_device(pos);
 425
 426                 if (tmp->dev == dev->parent) {
 427                         hd = tmp;
 428                         break;
 429                 }
 430         }
 431
 432         if (!hd) {
 433                 hd = devm_kzalloc(dev, sizeof(*hd), GFP_KERNEL);
 434                 if (!hd)
 435                         return -ENOMEM;
 436
 437                 hd->dev = dev->parent;
 438
 439                 list_add_tail(&hd->list, &hdmi_device_list);
 440         }
 441
 442         if (hd->cnt >= ARRAY_SIZE(hdmi_dai_name)) {
 443                 dev_err(dev, "too many hdmi codec are deteced\n");
 444                 return -EINVAL;
 445         }
 446
 447         hcp->hcd = *hcd;
 448         mutex_init(&hcp->current_stream_lock);
 449
 450         hcp->daidrv = devm_kzalloc(dev, dai_count * sizeof(*hcp->daidrv),
 451                                    GFP_KERNEL);
 452         if (!hcp->daidrv)
 453                 return -ENOMEM;
 454
 455         if (hcd->i2s) {
 456                 hcp->daidrv[i] = hdmi_i2s_dai;
 457                 hcp->daidrv[i].playback.channels_max =
 458                         hcd->max_i2s_channels;
 459                 hcp->daidrv[i].name = hdmi_dai_name[hd->cnt++];
 460                 i++;
 461         }
 462
 463         if (hcd->spdif) {
 464                 hcp->daidrv[i] = hdmi_spdif_dai;
 465                 hcp->daidrv[i].name = hdmi_dai_name[hd->cnt++];
 466         }
 467
 468         ret = snd_soc_register_codec(dev, &hdmi_codec, hcp->daidrv,
 469                                      dai_count);
 470         if (ret) {
 471                 dev_err(dev, "%s: snd_soc_register_codec() failed (%d)\n",
 472                         __func__, ret);
 473                 return ret;
 474         }
 475
 476         dev_set_drvdata(dev, hcp);
 477         return 0;
 478 }
 479
 480 static int hdmi_codec_remove(struct platform_device *pdev)
 481 {
 482         snd_soc_unregister_codec(&pdev->dev);
 483         return 0;
 484 }
 485
 486 static struct platform_driver hdmi_codec_driver = {
 487         .driver = {
 488                 .name = HDMI_CODEC_DRV_NAME,
 489         },
 490         .probe = hdmi_codec_probe,
 491         .remove = hdmi_codec_remove,
 492 };
 493
 494 module_platform_driver(hdmi_codec_driver);
 495
 496 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
 497 MODULE_DESCRIPTION("HDMI Audio Codec Driver");
 498 MODULE_LICENSE("GPL");
 499 MODULE_ALIAS("platform:" HDMI_CODEC_DRV_NAME);