kernel/sound/soc/omap/omap-hdmi-audio.c

   1 /*
   2  * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
   3  *
   4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Author: Jyri Sarha <jsarha@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/err.h>
  22 #include <linux/string.h>
  23 #include <linux/platform_device.h>
  24 #include <sound/soc.h>
  25 #include <sound/pcm_params.h>
  26 #include <sound/dmaengine_pcm.h>
  27 #include <uapi/sound/asound.h>
  28 #include <sound/asoundef.h>
  29 #include <sound/omap-pcm.h>
  30 #include <sound/omap-hdmi-audio.h>
  31 #include <video/omapdss.h>
  32
  33 #define DRV_NAME "omap-hdmi-audio"
  34
  35 struct hdmi_audio_data {
  36         struct snd_soc_card *card;
  37
  38         const struct omap_hdmi_audio_ops *ops;
  39         struct device *dssdev;
  40         struct snd_dmaengine_dai_dma_data dma_data;
  41         struct omap_dss_audio dss_audio;
  42         struct snd_aes_iec958 iec;
  43         struct snd_cea_861_aud_if cea;
  44
  45         struct mutex current_stream_lock;
  46         struct snd_pcm_substream *current_stream;
  47 };
  48
  49 static
  50 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
  51 {
  52         struct snd_soc_pcm_runtime *rtd = ss->private_data;
  53
  54         return snd_soc_card_get_drvdata(rtd->card);
  55 }
  56
  57 static void hdmi_dai_abort(struct device *dev)
  58 {
  59         struct hdmi_audio_data *ad = dev_get_drvdata(dev);
  60
  61         mutex_lock(&ad->current_stream_lock);
  62         if (ad->current_stream && ad->current_stream->runtime &&
  63             snd_pcm_running(ad->current_stream)) {
  64                 dev_err(dev, "HDMI display disabled, aborting playback\n");
  65                 snd_pcm_stream_lock_irq(ad->current_stream);
  66                 snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
  67                 snd_pcm_stream_unlock_irq(ad->current_stream);
  68         }
  69         mutex_unlock(&ad->current_stream_lock);
  70 }
  71
  72 static int hdmi_dai_startup(struct snd_pcm_substream *substream,
  73                             struct snd_soc_dai *dai)
  74 {
  75         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
  76         int ret;
  77         /*
  78          * Make sure that the period bytes are multiple of the DMA packet size.
  79          * Largest packet size we use is 32 32-bit words = 128 bytes
  80          */
  81         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  82                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
  83         if (ret < 0) {
  84                 dev_err(dai->dev, "Could not apply period constraint: %d\n",
  85                         ret);
  86                 return ret;
  87         }
  88         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  89                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
  90         if (ret < 0) {
  91                 dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
  92                         ret);
  93                 return ret;
  94         }
  95
  96         snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
  97
  98         mutex_lock(&ad->current_stream_lock);
  99         ad->current_stream = substream;
 100         mutex_unlock(&ad->current_stream_lock);
 101
 102         ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
 103
 104         if (ret) {
 105                 mutex_lock(&ad->current_stream_lock);
 106                 ad->current_stream = NULL;
 107                 mutex_unlock(&ad->current_stream_lock);
 108         }
 109
 110         return ret;
 111 }
 112
 113 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
 114                               struct snd_pcm_hw_params *params,
 115                               struct snd_soc_dai *dai)
 116 {
 117         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 118         struct snd_aes_iec958 *iec = &ad->iec;
 119         struct snd_cea_861_aud_if *cea = &ad->cea;
 120
 121         WARN_ON(ad->current_stream != substream);
 122
 123         switch (params_format(params)) {
 124         case SNDRV_PCM_FORMAT_S16_LE:
 125                 ad->dma_data.maxburst = 16;
 126                 break;
 127         case SNDRV_PCM_FORMAT_S24_LE:
 128                 ad->dma_data.maxburst = 32;
 129                 break;
 130         default:
 131                 dev_err(dai->dev, "format not supported!\n");
 132                 return -EINVAL;
 133         }
 134
 135         ad->dss_audio.iec = iec;
 136         ad->dss_audio.cea = cea;
 137         /*
 138          * fill the IEC-60958 channel status word
 139          */
 140         /* initialize the word bytes */
 141         memset(iec->status, 0, sizeof(iec->status));
 142
 143         /* specify IEC-60958-3 (commercial use) */
 144         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
 145
 146         /* specify that the audio is LPCM*/
 147         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
 148
 149         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
 150
 151         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
 152
 153         iec->status[1] = IEC958_AES1_CON_GENERAL;
 154
 155         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
 156
 157         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
 158
 159         switch (params_rate(params)) {
 160         case 32000:
 161                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
 162                 break;
 163         case 44100:
 164                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
 165                 break;
 166         case 48000:
 167                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
 168                 break;
 169         case 88200:
 170                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
 171                 break;
 172         case 96000:
 173                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
 174                 break;
 175         case 176400:
 176                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
 177                 break;
 178         case 192000:
 179                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
 180                 break;
 181         default:
 182                 dev_err(dai->dev, "rate not supported!\n");
 183                 return -EINVAL;
 184         }
 185
 186         /* specify the clock accuracy */
 187         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
 188
 189         /*
 190          * specify the word length. The same word length value can mean
 191          * two different lengths. Hence, we need to specify the maximum
 192          * word length as well.
 193          */
 194         switch (params_format(params)) {
 195         case SNDRV_PCM_FORMAT_S16_LE:
 196                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 197                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 198                 break;
 199         case SNDRV_PCM_FORMAT_S24_LE:
 200                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 201                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 202                 break;
 203         default:
 204                 dev_err(dai->dev, "format not supported!\n");
 205                 return -EINVAL;
 206         }
 207
 208         /*
 209          * Fill the CEA-861 audio infoframe (see spec for details)
 210          */
 211
 212         cea->db1_ct_cc = (params_channels(params) - 1)
 213                 & CEA861_AUDIO_INFOFRAME_DB1CC;
 214         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
 215
 216         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 217         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
 218
 219         cea->db3 = 0; /* not used, all zeros */
 220
 221         if (params_channels(params) == 2)
 222                 cea->db4_ca = 0x0;
 223         else if (params_channels(params) == 6)
 224                 cea->db4_ca = 0xb;
 225         else
 226                 cea->db4_ca = 0x13;
 227
 228         if (cea->db4_ca == 0x00)
 229                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
 230         else
 231                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 232
 233         /* the expression is trivial but makes clear what we are doing */
 234         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
 235
 236         return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
 237 }
 238
 239 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 240                             struct snd_soc_dai *dai)
 241 {
 242         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 243         int err = 0;
 244
 245         WARN_ON(ad->current_stream != substream);
 246
 247         switch (cmd) {
 248         case SNDRV_PCM_TRIGGER_START:
 249         case SNDRV_PCM_TRIGGER_RESUME:
 250         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 251                 err = ad->ops->audio_start(ad->dssdev);
 252                 break;
 253         case SNDRV_PCM_TRIGGER_STOP:
 254         case SNDRV_PCM_TRIGGER_SUSPEND:
 255         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 256                 ad->ops->audio_stop(ad->dssdev);
 257                 break;
 258         default:
 259                 err = -EINVAL;
 260         }
 261         return err;
 262 }
 263
 264 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 265                               struct snd_soc_dai *dai)
 266 {
 267         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 268
 269         WARN_ON(ad->current_stream != substream);
 270
 271         ad->ops->audio_shutdown(ad->dssdev);
 272
 273         mutex_lock(&ad->current_stream_lock);
 274         ad->current_stream = NULL;
 275         mutex_unlock(&ad->current_stream_lock);
 276 }
 277
 278 static const struct snd_soc_dai_ops hdmi_dai_ops = {
 279         .startup        = hdmi_dai_startup,
 280         .hw_params      = hdmi_dai_hw_params,
 281         .trigger        = hdmi_dai_trigger,
 282         .shutdown       = hdmi_dai_shutdown,
 283 };
 284
 285 static const struct snd_soc_component_driver omap_hdmi_component = {
 286         .name = "omapdss_hdmi",
 287 };
 288
 289 static struct snd_soc_dai_driver omap5_hdmi_dai = {
 290         .name = "omap5-hdmi-dai",
 291         .playback = {
 292                 .channels_min = 2,
 293                 .channels_max = 8,
 294                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 295                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
 296                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
 297                           SNDRV_PCM_RATE_192000),
 298                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 299         },
 300         .ops = &hdmi_dai_ops,
 301 };
 302
 303 static struct snd_soc_dai_driver omap4_hdmi_dai = {
 304         .name = "omap4-hdmi-dai",
 305         .playback = {
 306                 .channels_min = 2,
 307                 .channels_max = 8,
 308                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 309                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
 310                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
 311                           SNDRV_PCM_RATE_192000),
 312                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
 313         },
 314         .ops = &hdmi_dai_ops,
 315 };
 316
 317 static int omap_hdmi_audio_probe(struct platform_device *pdev)
 318 {
 319         struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
 320         struct device *dev = &pdev->dev;
 321         struct hdmi_audio_data *ad;
 322         struct snd_soc_dai_driver *dai_drv;
 323         struct snd_soc_card *card;
 324         int ret;
 325
 326         if (!ha) {
 327                 dev_err(dev, "No platform data\n");
 328                 return -EINVAL;
 329         }
 330
 331         ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
 332         if (!ad)
 333                 return -ENOMEM;
 334         ad->dssdev = ha->dev;
 335         ad->ops = ha->ops;
 336         ad->dma_data.addr = ha->audio_dma_addr;
 337         ad->dma_data.filter_data = "audio_tx";
 338         ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 339         mutex_init(&ad->current_stream_lock);
 340
 341         switch (ha->dss_version) {
 342         case OMAPDSS_VER_OMAP4430_ES1:
 343         case OMAPDSS_VER_OMAP4430_ES2:
 344         case OMAPDSS_VER_OMAP4:
 345                 dai_drv = &omap4_hdmi_dai;
 346                 break;
 347         case OMAPDSS_VER_OMAP5:
 348                 dai_drv = &omap5_hdmi_dai;
 349                 break;
 350         default:
 351                 return -EINVAL;
 352         }
 353         ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
 354                                          dai_drv, 1);
 355         if (ret)
 356                 return ret;
 357
 358         ret = omap_pcm_platform_register(ad->dssdev);
 359         if (ret)
 360                 return ret;
 361
 362         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 363         if (!card)
 364                 return -ENOMEM;
 365
 366         card->name = devm_kasprintf(dev, GFP_KERNEL,
 367                                     "HDMI %s", dev_name(ad->dssdev));
 368         card->owner = THIS_MODULE;
 369         card->dai_link =
 370                 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
 371         card->dai_link->name = card->name;
 372         card->dai_link->stream_name = card->name;
 373         card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
 374         card->dai_link->platform_name = dev_name(ad->dssdev);
 375         card->dai_link->codec_name = "snd-soc-dummy";
 376         card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
 377         card->num_links = 1;
 378         card->dev = dev;
 379
 380         ret = snd_soc_register_card(card);
 381         if (ret) {
 382                 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
 383                 snd_soc_unregister_component(ad->dssdev);
 384                 return ret;
 385         }
 386
 387         ad->card = card;
 388         snd_soc_card_set_drvdata(card, ad);
 389
 390         dev_set_drvdata(dev, ad);
 391
 392         return 0;
 393 }
 394
 395 static int omap_hdmi_audio_remove(struct platform_device *pdev)
 396 {
 397         struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
 398
 399         snd_soc_unregister_card(ad->card);
 400         snd_soc_unregister_component(ad->dssdev);
 401         return 0;
 402 }
 403
 404 static struct platform_driver hdmi_audio_driver = {
 405         .driver = {
 406                 .name = DRV_NAME,
 407         },
 408         .probe = omap_hdmi_audio_probe,
 409         .remove = omap_hdmi_audio_remove,
 410 };
 411
 412 module_platform_driver(hdmi_audio_driver);
 413
 414 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
 415 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
 416 MODULE_LICENSE("GPL");
 417 MODULE_ALIAS("platform:" DRV_NAME);