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