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_codec_priv {
  28         struct hdmi_codec_pdata hcd;
  29         struct snd_soc_dai_driver *daidrv;
  30         struct hdmi_codec_daifmt daifmt[2];
  31         struct mutex current_stream_lock;
  32         struct snd_pcm_substream *current_stream;
  33         struct snd_pcm_hw_constraint_list ratec;
  34         uint8_t eld[MAX_ELD_BYTES];
  35 };
  36
  37 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
  38         SND_SOC_DAPM_OUTPUT("TX"),
  39 };
  40
  41 static const struct snd_soc_dapm_route hdmi_routes[] = {
  42         { "TX", NULL, "Playback" },
  43 };
  44
  45 enum {
  46         DAI_ID_I2S = 0,
  47         DAI_ID_SPDIF,
  48 };
  49
  50 static int hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol,
  51                              struct snd_ctl_elem_info *uinfo)
  52 {
  53         struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
  54         struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
  55
  56         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
  57         uinfo->count = sizeof(hcp->eld);
  58
  59         return 0;
  60 }
  61
  62 static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
  63                             struct snd_ctl_elem_value *ucontrol)
  64 {
  65         struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
  66         struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
  67
  68         memcpy(ucontrol->value.bytes.data, hcp->eld, sizeof(hcp->eld));
  69
  70         return 0;
  71 }
  72
  73 static const struct snd_kcontrol_new hdmi_controls[] = {
  74         {
  75                 .access = SNDRV_CTL_ELEM_ACCESS_READ |
  76                           SNDRV_CTL_ELEM_ACCESS_VOLATILE,
  77                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  78                 .name = "ELD",
  79                 .info = hdmi_eld_ctl_info,
  80                 .get = hdmi_eld_ctl_get,
  81         },
  82 };
  83
  84 static int hdmi_codec_new_stream(struct snd_pcm_substream *substream,
  85                                  struct snd_soc_dai *dai)
  86 {
  87         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
  88         int ret = 0;
  89
  90         mutex_lock(&hcp->current_stream_lock);
  91         if (!hcp->current_stream) {
  92                 hcp->current_stream = substream;
  93         } else if (hcp->current_stream != substream) {
  94                 dev_err(dai->dev, "Only one simultaneous stream supported!\n");
  95                 ret = -EINVAL;
  96         }
  97         mutex_unlock(&hcp->current_stream_lock);
  98
  99         return ret;
 100 }
 101
 102 static int hdmi_codec_startup(struct snd_pcm_substream *substream,
 103                               struct snd_soc_dai *dai)
 104 {
 105         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 106         int ret = 0;
 107
 108         dev_dbg(dai->dev, "%s()\n", __func__);
 109
 110         ret = hdmi_codec_new_stream(substream, dai);
 111         if (ret)
 112                 return ret;
 113
 114         if (hcp->hcd.ops->audio_startup) {
 115                 ret = hcp->hcd.ops->audio_startup(dai->dev->parent, hcp->hcd.data);
 116                 if (ret) {
 117                         mutex_lock(&hcp->current_stream_lock);
 118                         hcp->current_stream = NULL;
 119                         mutex_unlock(&hcp->current_stream_lock);
 120                         return ret;
 121                 }
 122         }
 123
 124         if (hcp->hcd.ops->get_eld) {
 125                 ret = hcp->hcd.ops->get_eld(dai->dev->parent, hcp->hcd.data,
 126                                             hcp->eld, sizeof(hcp->eld));
 127
 128                 if (!ret) {
 129                         ret = snd_pcm_hw_constraint_eld(substream->runtime,
 130                                                         hcp->eld);
 131                         if (ret)
 132                                 return ret;
 133                 }
 134         }
 135         return 0;
 136 }
 137
 138 static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
 139                                 struct snd_soc_dai *dai)
 140 {
 141         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 142
 143         dev_dbg(dai->dev, "%s()\n", __func__);
 144
 145         WARN_ON(hcp->current_stream != substream);
 146
 147         hcp->hcd.ops->audio_shutdown(dai->dev->parent, hcp->hcd.data);
 148
 149         mutex_lock(&hcp->current_stream_lock);
 150         hcp->current_stream = NULL;
 151         mutex_unlock(&hcp->current_stream_lock);
 152 }
 153
 154 static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
 155                                 struct snd_pcm_hw_params *params,
 156                                 struct snd_soc_dai *dai)
 157 {
 158         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 159         struct hdmi_codec_params hp = {
 160                 .iec = {
 161                         .status = { 0 },
 162                         .subcode = { 0 },
 163                         .pad = 0,
 164                         .dig_subframe = { 0 },
 165                 }
 166         };
 167         int ret;
 168
 169         dev_dbg(dai->dev, "%s() width %d rate %d channels %d\n", __func__,
 170                 params_width(params), params_rate(params),
 171                 params_channels(params));
 172
 173         if (params_width(params) > 24)
 174                 params->msbits = 24;
 175
 176         ret = snd_pcm_create_iec958_consumer_hw_params(params, hp.iec.status,
 177                                                        sizeof(hp.iec.status));
 178         if (ret < 0) {
 179                 dev_err(dai->dev, "Creating IEC958 channel status failed %d\n",
 180                         ret);
 181                 return ret;
 182         }
 183
 184         ret = hdmi_codec_new_stream(substream, dai);
 185         if (ret)
 186                 return ret;
 187
 188         hdmi_audio_infoframe_init(&hp.cea);
 189         hp.cea.channels = params_channels(params);
 190         hp.cea.coding_type = HDMI_AUDIO_CODING_TYPE_STREAM;
 191         hp.cea.sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM;
 192         hp.cea.sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM;
 193
 194         hp.sample_width = params_width(params);
 195         hp.sample_rate = params_rate(params);
 196         hp.channels = params_channels(params);
 197
 198         return hcp->hcd.ops->hw_params(dai->dev->parent, hcp->hcd.data,
 199                                        &hcp->daifmt[dai->id], &hp);
 200 }
 201
 202 static int hdmi_codec_set_fmt(struct snd_soc_dai *dai,
 203                               unsigned int fmt)
 204 {
 205         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 206         struct hdmi_codec_daifmt cf = { 0 };
 207         int ret = 0;
 208
 209         dev_dbg(dai->dev, "%s()\n", __func__);
 210
 211         if (dai->id == DAI_ID_SPDIF) {
 212                 cf.fmt = HDMI_SPDIF;
 213         } else {
 214                 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 215                 case SND_SOC_DAIFMT_CBM_CFM:
 216                         cf.bit_clk_master = 1;
 217                         cf.frame_clk_master = 1;
 218                         break;
 219                 case SND_SOC_DAIFMT_CBS_CFM:
 220                         cf.frame_clk_master = 1;
 221                         break;
 222                 case SND_SOC_DAIFMT_CBM_CFS:
 223                         cf.bit_clk_master = 1;
 224                         break;
 225                 case SND_SOC_DAIFMT_CBS_CFS:
 226                         break;
 227                 default:
 228                         return -EINVAL;
 229                 }
 230
 231                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 232                 case SND_SOC_DAIFMT_NB_NF:
 233                         break;
 234                 case SND_SOC_DAIFMT_NB_IF:
 235                         cf.frame_clk_inv = 1;
 236                         break;
 237                 case SND_SOC_DAIFMT_IB_NF:
 238                         cf.bit_clk_inv = 1;
 239                         break;
 240                 case SND_SOC_DAIFMT_IB_IF:
 241                         cf.frame_clk_inv = 1;
 242                         cf.bit_clk_inv = 1;
 243                         break;
 244                 }
 245
 246                 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 247                 case SND_SOC_DAIFMT_I2S:
 248                         cf.fmt = HDMI_I2S;
 249                         break;
 250                 case SND_SOC_DAIFMT_DSP_A:
 251                         cf.fmt = HDMI_DSP_A;
 252                         break;
 253                 case SND_SOC_DAIFMT_DSP_B:
 254                         cf.fmt = HDMI_DSP_B;
 255                         break;
 256                 case SND_SOC_DAIFMT_RIGHT_J:
 257                         cf.fmt = HDMI_RIGHT_J;
 258                         break;
 259                 case SND_SOC_DAIFMT_LEFT_J:
 260                         cf.fmt = HDMI_LEFT_J;
 261                         break;
 262                 case SND_SOC_DAIFMT_AC97:
 263                         cf.fmt = HDMI_AC97;
 264                         break;
 265                 default:
 266                         dev_err(dai->dev, "Invalid DAI interface format\n");
 267                         return -EINVAL;
 268                 }
 269         }
 270
 271         hcp->daifmt[dai->id] = cf;
 272
 273         return ret;
 274 }
 275
 276 static int hdmi_codec_digital_mute(struct snd_soc_dai *dai, int mute)
 277 {
 278         struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
 279
 280         dev_dbg(dai->dev, "%s()\n", __func__);
 281
 282         if (hcp->hcd.ops->digital_mute)
 283                 return hcp->hcd.ops->digital_mute(dai->dev->parent,
 284                                                   hcp->hcd.data, mute);
 285
 286         return 0;
 287 }
 288
 289 static const struct snd_soc_dai_ops hdmi_dai_ops = {
 290         .startup        = hdmi_codec_startup,
 291         .shutdown       = hdmi_codec_shutdown,
 292         .hw_params      = hdmi_codec_hw_params,
 293         .set_fmt        = hdmi_codec_set_fmt,
 294         .digital_mute   = hdmi_codec_digital_mute,
 295 };
 296
 297
 298 #define HDMI_RATES      (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 299                          SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 300                          SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |\
 301                          SNDRV_PCM_RATE_192000)
 302
 303 #define SPDIF_FORMATS   (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
 304                          SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
 305                          SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
 306                          SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
 307
 308 /*
 309  * This list is only for formats allowed on the I2S bus. So there is
 310  * some formats listed that are not supported by HDMI interface. For
 311  * instance allowing the 32-bit formats enables 24-precision with CPU
 312  * DAIs that do not support 24-bit formats. If the extra formats cause
 313  * problems, we should add the video side driver an option to disable
 314  * them.
 315  */
 316 #define I2S_FORMATS     (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |\
 317                          SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
 318                          SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
 319                          SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |\
 320                          SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE)
 321
 322 static struct snd_soc_dai_driver hdmi_i2s_dai = {
 323         .name = "i2s-hifi",
 324         .id = DAI_ID_I2S,
 325         .playback = {
 326                 .stream_name = "Playback",
 327                 .channels_min = 2,
 328                 .channels_max = 8,
 329                 .rates = HDMI_RATES,
 330                 .formats = I2S_FORMATS,
 331                 .sig_bits = 24,
 332         },
 333         .ops = &hdmi_dai_ops,
 334 };
 335
 336 static const struct snd_soc_dai_driver hdmi_spdif_dai = {
 337         .name = "spdif-hifi",
 338         .id = DAI_ID_SPDIF,
 339         .playback = {
 340                 .stream_name = "Playback",
 341                 .channels_min = 2,
 342                 .channels_max = 2,
 343                 .rates = HDMI_RATES,
 344                 .formats = SPDIF_FORMATS,
 345         },
 346         .ops = &hdmi_dai_ops,
 347 };
 348
 349 static struct snd_soc_codec_driver hdmi_codec = {
 350         .controls = hdmi_controls,
 351         .num_controls = ARRAY_SIZE(hdmi_controls),
 352         .dapm_widgets = hdmi_widgets,
 353         .num_dapm_widgets = ARRAY_SIZE(hdmi_widgets),
 354         .dapm_routes = hdmi_routes,
 355         .num_dapm_routes = ARRAY_SIZE(hdmi_routes),
 356 };
 357
 358 static int hdmi_codec_probe(struct platform_device *pdev)
 359 {
 360         struct hdmi_codec_pdata *hcd = pdev->dev.platform_data;
 361         struct device *dev = &pdev->dev;
 362         struct hdmi_codec_priv *hcp;
 363         int dai_count, i = 0;
 364         int ret;
 365
 366         dev_dbg(dev, "%s()\n", __func__);
 367
 368         if (!hcd) {
 369                 dev_err(dev, "%s: No plalform data\n", __func__);
 370                 return -EINVAL;
 371         }
 372
 373         dai_count = hcd->i2s + hcd->spdif;
 374         if (dai_count < 1 || !hcd->ops || !hcd->ops->hw_params ||
 375             !hcd->ops->audio_shutdown) {
 376                 dev_err(dev, "%s: Invalid parameters\n", __func__);
 377                 return -EINVAL;
 378         }
 379
 380         hcp = devm_kzalloc(dev, sizeof(*hcp), GFP_KERNEL);
 381         if (!hcp)
 382                 return -ENOMEM;
 383
 384         hcp->hcd = *hcd;
 385         mutex_init(&hcp->current_stream_lock);
 386
 387         hcp->daidrv = devm_kzalloc(dev, dai_count * sizeof(*hcp->daidrv),
 388                                    GFP_KERNEL);
 389         if (!hcp->daidrv)
 390                 return -ENOMEM;
 391
 392         if (hcd->i2s) {
 393                 hcp->daidrv[i] = hdmi_i2s_dai;
 394                 hcp->daidrv[i].playback.channels_max =
 395                         hcd->max_i2s_channels;
 396                 i++;
 397         }
 398
 399         if (hcd->spdif)
 400                 hcp->daidrv[i] = hdmi_spdif_dai;
 401
 402         ret = snd_soc_register_codec(dev, &hdmi_codec, hcp->daidrv,
 403                                      dai_count);
 404         if (ret) {
 405                 dev_err(dev, "%s: snd_soc_register_codec() failed (%d)\n",
 406                         __func__, ret);
 407                 return ret;
 408         }
 409
 410         dev_set_drvdata(dev, hcp);
 411         return 0;
 412 }
 413
 414 static int hdmi_codec_remove(struct platform_device *pdev)
 415 {
 416         snd_soc_unregister_codec(&pdev->dev);
 417         return 0;
 418 }
 419
 420 static struct platform_driver hdmi_codec_driver = {
 421         .driver = {
 422                 .name = HDMI_CODEC_DRV_NAME,
 423         },
 424         .probe = hdmi_codec_probe,
 425         .remove = hdmi_codec_remove,
 426 };
 427
 428 module_platform_driver(hdmi_codec_driver);
 429
 430 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
 431 MODULE_DESCRIPTION("HDMI Audio Codec Driver");
 432 MODULE_LICENSE("GPL");
 433 MODULE_ALIAS("platform:" HDMI_CODEC_DRV_NAME);