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
  32 #define DRV_NAME "omap-hdmi-audio"
  33
  34 struct hdmi_audio_data {
  35         struct snd_soc_card *card;
  36
  37         const struct omap_hdmi_audio_ops *ops;
  38         struct device *dssdev;
  39         struct snd_dmaengine_dai_dma_data dma_data;
  40         struct omap_dss_audio dss_audio;
  41         struct snd_aes_iec958 iec;
  42         struct snd_cea_861_aud_if cea;
  43
  44         struct mutex current_stream_lock;
  45         struct snd_pcm_substream *current_stream;
  46 };
  47
  48 static
  49 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
  50 {
  51         struct snd_soc_pcm_runtime *rtd = ss->private_data;
  52
  53         return snd_soc_card_get_drvdata(rtd->card);
  54 }
  55
  56 static void hdmi_dai_abort(struct device *dev)
  57 {
  58         struct hdmi_audio_data *ad = dev_get_drvdata(dev);
  59
  60         mutex_lock(&ad->current_stream_lock);
  61         if (ad->current_stream && ad->current_stream->runtime &&
  62             snd_pcm_running(ad->current_stream)) {
  63                 dev_err(dev, "HDMI display disabled, aborting playback\n");
  64                 snd_pcm_stream_lock_irq(ad->current_stream);
  65                 snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
  66                 snd_pcm_stream_unlock_irq(ad->current_stream);
  67         }
  68         mutex_unlock(&ad->current_stream_lock);
  69 }
  70
  71 static int hdmi_dai_startup(struct snd_pcm_substream *substream,
  72                             struct snd_soc_dai *dai)
  73 {
  74         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
  75         int ret;
  76         /*
  77          * Make sure that the period bytes are multiple of the DMA packet size.
  78          * Largest packet size we use is 32 32-bit words = 128 bytes
  79          */
  80         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  81                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
  82         if (ret < 0) {
  83                 dev_err(dai->dev, "Could not apply period constraint: %d\n",
  84                         ret);
  85                 return ret;
  86         }
  87         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  88                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
  89         if (ret < 0) {
  90                 dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
  91                         ret);
  92                 return ret;
  93         }
  94
  95         snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
  96
  97         mutex_lock(&ad->current_stream_lock);
  98         ad->current_stream = substream;
  99         mutex_unlock(&ad->current_stream_lock);
 100
 101         ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
 102
 103         if (ret) {
 104                 mutex_lock(&ad->current_stream_lock);
 105                 ad->current_stream = NULL;
 106                 mutex_unlock(&ad->current_stream_lock);
 107         }
 108
 109         return ret;
 110 }
 111
 112 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
 113                               struct snd_pcm_hw_params *params,
 114                               struct snd_soc_dai *dai)
 115 {
 116         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 117         struct snd_aes_iec958 *iec = &ad->iec;
 118         struct snd_cea_861_aud_if *cea = &ad->cea;
 119
 120         WARN_ON(ad->current_stream != substream);
 121
 122         switch (params_format(params)) {
 123         case SNDRV_PCM_FORMAT_S16_LE:
 124                 ad->dma_data.maxburst = 16;
 125                 break;
 126         case SNDRV_PCM_FORMAT_S24_LE:
 127                 ad->dma_data.maxburst = 32;
 128                 break;
 129         default:
 130                 dev_err(dai->dev, "format not supported!\n");
 131                 return -EINVAL;
 132         }
 133
 134         ad->dss_audio.iec = iec;
 135         ad->dss_audio.cea = cea;
 136         /*
 137          * fill the IEC-60958 channel status word
 138          */
 139         /* initialize the word bytes */
 140         memset(iec->status, 0, sizeof(iec->status));
 141
 142         /* specify IEC-60958-3 (commercial use) */
 143         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
 144
 145         /* specify that the audio is LPCM*/
 146         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
 147
 148         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
 149
 150         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
 151
 152         iec->status[1] = IEC958_AES1_CON_GENERAL;
 153
 154         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
 155
 156         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
 157
 158         switch (params_rate(params)) {
 159         case 32000:
 160                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
 161                 break;
 162         case 44100:
 163                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
 164                 break;
 165         case 48000:
 166                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
 167                 break;
 168         case 88200:
 169                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
 170                 break;
 171         case 96000:
 172                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
 173                 break;
 174         case 176400:
 175                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
 176                 break;
 177         case 192000:
 178                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
 179                 break;
 180         default:
 181                 dev_err(dai->dev, "rate not supported!\n");
 182                 return -EINVAL;
 183         }
 184
 185         /* specify the clock accuracy */
 186         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
 187
 188         /*
 189          * specify the word length. The same word length value can mean
 190          * two different lengths. Hence, we need to specify the maximum
 191          * word length as well.
 192          */
 193         switch (params_format(params)) {
 194         case SNDRV_PCM_FORMAT_S16_LE:
 195                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 196                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 197                 break;
 198         case SNDRV_PCM_FORMAT_S24_LE:
 199                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 200                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 201                 break;
 202         default:
 203                 dev_err(dai->dev, "format not supported!\n");
 204                 return -EINVAL;
 205         }
 206
 207         /*
 208          * Fill the CEA-861 audio infoframe (see spec for details)
 209          */
 210
 211         cea->db1_ct_cc = (params_channels(params) - 1)
 212                 & CEA861_AUDIO_INFOFRAME_DB1CC;
 213         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
 214
 215         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 216         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
 217
 218         cea->db3 = 0; /* not used, all zeros */
 219
 220         if (params_channels(params) == 2)
 221                 cea->db4_ca = 0x0;
 222         else if (params_channels(params) == 6)
 223                 cea->db4_ca = 0xb;
 224         else
 225                 cea->db4_ca = 0x13;
 226
 227         if (cea->db4_ca == 0x00)
 228                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
 229         else
 230                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 231
 232         /* the expression is trivial but makes clear what we are doing */
 233         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
 234
 235         return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
 236 }
 237
 238 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 239                             struct snd_soc_dai *dai)
 240 {
 241         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 242         int err = 0;
 243
 244         WARN_ON(ad->current_stream != substream);
 245
 246         switch (cmd) {
 247         case SNDRV_PCM_TRIGGER_START:
 248         case SNDRV_PCM_TRIGGER_RESUME:
 249         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 250                 err = ad->ops->audio_start(ad->dssdev);
 251                 break;
 252         case SNDRV_PCM_TRIGGER_STOP:
 253         case SNDRV_PCM_TRIGGER_SUSPEND:
 254         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 255                 ad->ops->audio_stop(ad->dssdev);
 256                 break;
 257         default:
 258                 err = -EINVAL;
 259         }
 260         return err;
 261 }
 262
 263 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 264                               struct snd_soc_dai *dai)
 265 {
 266         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 267
 268         WARN_ON(ad->current_stream != substream);
 269
 270         ad->ops->audio_shutdown(ad->dssdev);
 271
 272         mutex_lock(&ad->current_stream_lock);
 273         ad->current_stream = NULL;
 274         mutex_unlock(&ad->current_stream_lock);
 275 }
 276
 277 static const struct snd_soc_dai_ops hdmi_dai_ops = {
 278         .startup        = hdmi_dai_startup,
 279         .hw_params      = hdmi_dai_hw_params,
 280         .trigger        = hdmi_dai_trigger,
 281         .shutdown       = hdmi_dai_shutdown,
 282 };
 283
 284 static const struct snd_soc_component_driver omap_hdmi_component = {
 285         .name = "omapdss_hdmi",
 286 };
 287
 288 static struct snd_soc_dai_driver omap5_hdmi_dai = {
 289         .name = "omap5-hdmi-dai",
 290         .playback = {
 291                 .channels_min = 2,
 292                 .channels_max = 8,
 293                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 294                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
 295                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
 296                           SNDRV_PCM_RATE_192000),
 297                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 298         },
 299         .ops = &hdmi_dai_ops,
 300 };
 301
 302 static struct snd_soc_dai_driver omap4_hdmi_dai = {
 303         .name = "omap4-hdmi-dai",
 304         .playback = {
 305                 .channels_min = 2,
 306                 .channels_max = 8,
 307                 .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                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
 312         },
 313         .ops = &hdmi_dai_ops,
 314 };
 315
 316 static int omap_hdmi_audio_probe(struct platform_device *pdev)
 317 {
 318         struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
 319         struct device *dev = &pdev->dev;
 320         struct hdmi_audio_data *ad;
 321         struct snd_soc_dai_driver *dai_drv;
 322         struct snd_soc_card *card;
 323         int ret;
 324
 325         if (!ha) {
 326                 dev_err(dev, "No platform data\n");
 327                 return -EINVAL;
 328         }
 329
 330         ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
 331         if (!ad)
 332                 return -ENOMEM;
 333         ad->dssdev = ha->dev;
 334         ad->ops = ha->ops;
 335         ad->dma_data.addr = ha->audio_dma_addr;
 336         ad->dma_data.filter_data = "audio_tx";
 337         ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 338         mutex_init(&ad->current_stream_lock);
 339
 340         switch (ha->dss_version) {
 341         case OMAPDSS_VER_OMAP4430_ES1:
 342         case OMAPDSS_VER_OMAP4430_ES2:
 343         case OMAPDSS_VER_OMAP4:
 344                 dai_drv = &omap4_hdmi_dai;
 345                 break;
 346         case OMAPDSS_VER_OMAP5:
 347         case OMAPDSS_VER_DRA7xx:
 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         if (!card->dai_link)
 372                 return -ENOMEM;
 373         card->dai_link->name = card->name;
 374         card->dai_link->stream_name = card->name;
 375         card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
 376         card->dai_link->platform_name = dev_name(ad->dssdev);
 377         card->dai_link->codec_name = "snd-soc-dummy";
 378         card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
 379         card->num_links = 1;
 380         card->dev = dev;
 381
 382         ret = snd_soc_register_card(card);
 383         if (ret) {
 384                 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
 385                 snd_soc_unregister_component(ad->dssdev);
 386                 return ret;
 387         }
 388
 389         ad->card = card;
 390         snd_soc_card_set_drvdata(card, ad);
 391
 392         dev_set_drvdata(dev, ad);
 393
 394         return 0;
 395 }
 396
 397 static int omap_hdmi_audio_remove(struct platform_device *pdev)
 398 {
 399         struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
 400
 401         snd_soc_unregister_card(ad->card);
 402         snd_soc_unregister_component(ad->dssdev);
 403         return 0;
 404 }
 405
 406 static struct platform_driver hdmi_audio_driver = {
 407         .driver = {
 408                 .name = DRV_NAME,
 409         },
 410         .probe = omap_hdmi_audio_probe,
 411         .remove = omap_hdmi_audio_remove,
 412 };
 413
 414 module_platform_driver(hdmi_audio_driver);
 415
 416 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
 417 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
 418 MODULE_LICENSE("GPL");
 419 MODULE_ALIAS("platform:" DRV_NAME);