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 constraint\n");
  85                 return ret;
  86         }
  87
  88         snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
  89
  90         mutex_lock(&ad->current_stream_lock);
  91         ad->current_stream = substream;
  92         mutex_unlock(&ad->current_stream_lock);
  93
  94         ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
  95
  96         if (ret) {
  97                 mutex_lock(&ad->current_stream_lock);
  98                 ad->current_stream = NULL;
  99                 mutex_unlock(&ad->current_stream_lock);
 100         }
 101
 102         return ret;
 103 }
 104
 105 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
 106                               struct snd_pcm_hw_params *params,
 107                               struct snd_soc_dai *dai)
 108 {
 109         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 110         struct snd_aes_iec958 *iec = &ad->iec;
 111         struct snd_cea_861_aud_if *cea = &ad->cea;
 112
 113         WARN_ON(ad->current_stream != substream);
 114
 115         switch (params_format(params)) {
 116         case SNDRV_PCM_FORMAT_S16_LE:
 117                 ad->dma_data.maxburst = 16;
 118                 break;
 119         case SNDRV_PCM_FORMAT_S24_LE:
 120                 ad->dma_data.maxburst = 32;
 121                 break;
 122         default:
 123                 dev_err(dai->dev, "format not supported!\n");
 124                 return -EINVAL;
 125         }
 126
 127         ad->dss_audio.iec = iec;
 128         ad->dss_audio.cea = cea;
 129         /*
 130          * fill the IEC-60958 channel status word
 131          */
 132         /* initialize the word bytes */
 133         memset(iec->status, 0, sizeof(iec->status));
 134
 135         /* specify IEC-60958-3 (commercial use) */
 136         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
 137
 138         /* specify that the audio is LPCM*/
 139         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
 140
 141         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
 142
 143         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
 144
 145         iec->status[1] = IEC958_AES1_CON_GENERAL;
 146
 147         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
 148
 149         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
 150
 151         switch (params_rate(params)) {
 152         case 32000:
 153                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
 154                 break;
 155         case 44100:
 156                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
 157                 break;
 158         case 48000:
 159                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
 160                 break;
 161         case 88200:
 162                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
 163                 break;
 164         case 96000:
 165                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
 166                 break;
 167         case 176400:
 168                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
 169                 break;
 170         case 192000:
 171                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
 172                 break;
 173         default:
 174                 dev_err(dai->dev, "rate not supported!\n");
 175                 return -EINVAL;
 176         }
 177
 178         /* specify the clock accuracy */
 179         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
 180
 181         /*
 182          * specify the word length. The same word length value can mean
 183          * two different lengths. Hence, we need to specify the maximum
 184          * word length as well.
 185          */
 186         switch (params_format(params)) {
 187         case SNDRV_PCM_FORMAT_S16_LE:
 188                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 189                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 190                 break;
 191         case SNDRV_PCM_FORMAT_S24_LE:
 192                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 193                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 194                 break;
 195         default:
 196                 dev_err(dai->dev, "format not supported!\n");
 197                 return -EINVAL;
 198         }
 199
 200         /*
 201          * Fill the CEA-861 audio infoframe (see spec for details)
 202          */
 203
 204         cea->db1_ct_cc = (params_channels(params) - 1)
 205                 & CEA861_AUDIO_INFOFRAME_DB1CC;
 206         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
 207
 208         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 209         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
 210
 211         cea->db3 = 0; /* not used, all zeros */
 212
 213         /*
 214          * The OMAP HDMI IP requires to use the 8-channel channel code when
 215          * transmitting more than two channels.
 216          */
 217         if (params_channels(params) == 2)
 218                 cea->db4_ca = 0x0;
 219         else
 220                 cea->db4_ca = 0x13;
 221
 222         cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 223         /* the expression is trivial but makes clear what we are doing */
 224         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
 225
 226         return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
 227 }
 228
 229 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 230                             struct snd_soc_dai *dai)
 231 {
 232         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 233         int err = 0;
 234
 235         WARN_ON(ad->current_stream != substream);
 236
 237         switch (cmd) {
 238         case SNDRV_PCM_TRIGGER_START:
 239         case SNDRV_PCM_TRIGGER_RESUME:
 240         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 241                 err = ad->ops->audio_start(ad->dssdev);
 242                 break;
 243         case SNDRV_PCM_TRIGGER_STOP:
 244         case SNDRV_PCM_TRIGGER_SUSPEND:
 245         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 246                 ad->ops->audio_stop(ad->dssdev);
 247                 break;
 248         default:
 249                 err = -EINVAL;
 250         }
 251         return err;
 252 }
 253
 254 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 255                               struct snd_soc_dai *dai)
 256 {
 257         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 258
 259         WARN_ON(ad->current_stream != substream);
 260
 261         ad->ops->audio_shutdown(ad->dssdev);
 262
 263         mutex_lock(&ad->current_stream_lock);
 264         ad->current_stream = NULL;
 265         mutex_unlock(&ad->current_stream_lock);
 266 }
 267
 268 static const struct snd_soc_dai_ops hdmi_dai_ops = {
 269         .startup        = hdmi_dai_startup,
 270         .hw_params      = hdmi_dai_hw_params,
 271         .trigger        = hdmi_dai_trigger,
 272         .shutdown       = hdmi_dai_shutdown,
 273 };
 274
 275 static const struct snd_soc_component_driver omap_hdmi_component = {
 276         .name = "omapdss_hdmi",
 277 };
 278
 279 static struct snd_soc_dai_driver omap5_hdmi_dai = {
 280         .name = "omap5-hdmi-dai",
 281         .playback = {
 282                 .channels_min = 2,
 283                 .channels_max = 8,
 284                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 285                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
 286                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
 287                           SNDRV_PCM_RATE_192000),
 288                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 289         },
 290         .ops = &hdmi_dai_ops,
 291 };
 292
 293 static struct snd_soc_dai_driver omap4_hdmi_dai = {
 294         .name = "omap4-hdmi-dai",
 295         .playback = {
 296                 .channels_min = 2,
 297                 .channels_max = 8,
 298                 .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                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
 303         },
 304         .ops = &hdmi_dai_ops,
 305 };
 306
 307 static int omap_hdmi_audio_probe(struct platform_device *pdev)
 308 {
 309         struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
 310         struct device *dev = &pdev->dev;
 311         struct hdmi_audio_data *ad;
 312         struct snd_soc_dai_driver *dai_drv;
 313         struct snd_soc_card *card;
 314         int ret;
 315
 316         if (!ha) {
 317                 dev_err(dev, "No platform data\n");
 318                 return -EINVAL;
 319         }
 320
 321         ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
 322         if (!ad)
 323                 return -ENOMEM;
 324         ad->dssdev = ha->dev;
 325         ad->ops = ha->ops;
 326         ad->dma_data.addr = ha->audio_dma_addr;
 327         ad->dma_data.filter_data = "audio_tx";
 328         ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 329         mutex_init(&ad->current_stream_lock);
 330
 331         switch (ha->dss_version) {
 332         case OMAPDSS_VER_OMAP4430_ES1:
 333         case OMAPDSS_VER_OMAP4430_ES2:
 334         case OMAPDSS_VER_OMAP4:
 335                 dai_drv = &omap4_hdmi_dai;
 336                 break;
 337         case OMAPDSS_VER_OMAP5:
 338                 dai_drv = &omap5_hdmi_dai;
 339                 break;
 340         default:
 341                 return -EINVAL;
 342         }
 343         ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
 344                                          dai_drv, 1);
 345         if (ret)
 346                 return ret;
 347
 348         ret = omap_pcm_platform_register(ad->dssdev);
 349         if (ret)
 350                 return ret;
 351
 352         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 353         if (!card)
 354                 return -ENOMEM;
 355
 356         card->name = devm_kasprintf(dev, GFP_KERNEL,
 357                                     "HDMI %s", dev_name(ad->dssdev));
 358         card->owner = THIS_MODULE;
 359         card->dai_link =
 360                 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
 361         card->dai_link->name = card->name;
 362         card->dai_link->stream_name = card->name;
 363         card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
 364         card->dai_link->platform_name = dev_name(ad->dssdev);
 365         card->dai_link->codec_name = "snd-soc-dummy";
 366         card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
 367         card->num_links = 1;
 368         card->dev = dev;
 369
 370         ret = snd_soc_register_card(card);
 371         if (ret) {
 372                 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
 373                 snd_soc_unregister_component(ad->dssdev);
 374                 return ret;
 375         }
 376
 377         ad->card = card;
 378         snd_soc_card_set_drvdata(card, ad);
 379
 380         dev_set_drvdata(dev, ad);
 381
 382         return 0;
 383 }
 384
 385 static int omap_hdmi_audio_remove(struct platform_device *pdev)
 386 {
 387         struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
 388
 389         snd_soc_unregister_card(ad->card);
 390         snd_soc_unregister_component(ad->dssdev);
 391         return 0;
 392 }
 393
 394 static struct platform_driver hdmi_audio_driver = {
 395         .driver = {
 396                 .name = DRV_NAME,
 397         },
 398         .probe = omap_hdmi_audio_probe,
 399         .remove = omap_hdmi_audio_remove,
 400 };
 401
 402 module_platform_driver(hdmi_audio_driver);
 403
 404 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
 405 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
 406 MODULE_LICENSE("GPL");
 407 MODULE_ALIAS("platform:" DRV_NAME);