sound/soc/omap/omap-hdmi.c

   1 /*
   2  * omap-hdmi.c
   3  *
   4  * OMAP ALSA SoC DAI driver for HDMI audio on OMAP4 processors.
   5  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
   6  * Authors: Jorge Candelaria <jorge.candelaria@ti.com>
   7  *          Ricardo Neri <ricardo.neri@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  */
  24
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/initval.h>
  32 #include <sound/soc.h>
  33 #include <sound/asound.h>
  34 #include <sound/asoundef.h>
  35 #include <sound/dmaengine_pcm.h>
  36 #include <video/omapdss.h>
  37
  38 #include "omap-hdmi.h"
  39
  40 #define DRV_NAME "omap-hdmi-audio-dai"
  41
  42 struct hdmi_priv {
  43         struct snd_dmaengine_dai_dma_data dma_data;
  44         unsigned int dma_req;
  45         struct omap_dss_audio dss_audio;
  46         struct snd_aes_iec958 iec;
  47         struct snd_cea_861_aud_if cea;
  48         struct omap_dss_device *dssdev;
  49 };
  50
  51 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
  52                                   struct snd_soc_dai *dai)
  53 {
  54         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  55         int err;
  56         /*
  57          * Make sure that the period bytes are multiple of the DMA packet size.
  58          * Largest packet size we use is 32 32-bit words = 128 bytes
  59          */
  60         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
  61                                  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
  62         if (err < 0) {
  63                 dev_err(dai->dev, "could not apply constraint\n");
  64                 return err;
  65         }
  66
  67         if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
  68                 dev_err(dai->dev, "audio not supported\n");
  69                 return -ENODEV;
  70         }
  71
  72         snd_soc_dai_set_dma_data(dai, substream, &priv->dma_data);
  73
  74         return 0;
  75 }
  76
  77 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
  78                                 struct snd_soc_dai *dai)
  79 {
  80         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  81
  82         return priv->dssdev->driver->audio_enable(priv->dssdev);
  83 }
  84
  85 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
  86                                     struct snd_pcm_hw_params *params,
  87                                     struct snd_soc_dai *dai)
  88 {
  89         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  90         struct snd_aes_iec958 *iec = &priv->iec;
  91         struct snd_cea_861_aud_if *cea = &priv->cea;
  92         int err = 0;
  93
  94         switch (params_format(params)) {
  95         case SNDRV_PCM_FORMAT_S16_LE:
  96                 priv->dma_data.maxburst = 16;
  97                 break;
  98         case SNDRV_PCM_FORMAT_S24_LE:
  99                 priv->dma_data.maxburst = 32;
 100                 break;
 101         default:
 102                 dev_err(dai->dev, "format not supported!\n");
 103                 return -EINVAL;
 104         }
 105
 106         /*
 107          * fill the IEC-60958 channel status word
 108          */
 109         /* initialize the word bytes */
 110         memset(iec->status, 0, sizeof(iec->status));
 111
 112         /* specify IEC-60958-3 (commercial use) */
 113         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
 114
 115         /* specify that the audio is LPCM*/
 116         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
 117
 118         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
 119
 120         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
 121
 122         iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
 123
 124         iec->status[1] = IEC958_AES1_CON_GENERAL;
 125
 126         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
 127
 128         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
 129
 130         switch (params_rate(params)) {
 131         case 32000:
 132                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
 133                 break;
 134         case 44100:
 135                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
 136                 break;
 137         case 48000:
 138                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
 139                 break;
 140         case 88200:
 141                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
 142                 break;
 143         case 96000:
 144                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
 145                 break;
 146         case 176400:
 147                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
 148                 break;
 149         case 192000:
 150                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
 151                 break;
 152         default:
 153                 dev_err(dai->dev, "rate not supported!\n");
 154                 return -EINVAL;
 155         }
 156
 157         /* specify the clock accuracy */
 158         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
 159
 160         /*
 161          * specify the word length. The same word length value can mean
 162          * two different lengths. Hence, we need to specify the maximum
 163          * word length as well.
 164          */
 165         switch (params_format(params)) {
 166         case SNDRV_PCM_FORMAT_S16_LE:
 167                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 168                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 169                 break;
 170         case SNDRV_PCM_FORMAT_S24_LE:
 171                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 172                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 173                 break;
 174         default:
 175                 dev_err(dai->dev, "format not supported!\n");
 176                 return -EINVAL;
 177         }
 178
 179         /*
 180          * Fill the CEA-861 audio infoframe (see spec for details)
 181          */
 182
 183         cea->db1_ct_cc = (params_channels(params) - 1)
 184                 & CEA861_AUDIO_INFOFRAME_DB1CC;
 185         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
 186
 187         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 188         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
 189
 190         cea->db3 = 0; /* not used, all zeros */
 191
 192         /*
 193          * The OMAP HDMI IP requires to use the 8-channel channel code when
 194          * transmitting more than two channels.
 195          */
 196         if (params_channels(params) == 2)
 197                 cea->db4_ca = 0x0;
 198         else
 199                 cea->db4_ca = 0x13;
 200
 201         cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 202         /* the expression is trivial but makes clear what we are doing */
 203         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
 204
 205         priv->dss_audio.iec = iec;
 206         priv->dss_audio.cea = cea;
 207
 208         err = priv->dssdev->driver->audio_config(priv->dssdev,
 209                                                  &priv->dss_audio);
 210
 211         return err;
 212 }
 213
 214 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 215                                 struct snd_soc_dai *dai)
 216 {
 217         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 218         int err = 0;
 219
 220         switch (cmd) {
 221         case SNDRV_PCM_TRIGGER_START:
 222         case SNDRV_PCM_TRIGGER_RESUME:
 223         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 224                 err = priv->dssdev->driver->audio_start(priv->dssdev);
 225                 break;
 226         case SNDRV_PCM_TRIGGER_STOP:
 227         case SNDRV_PCM_TRIGGER_SUSPEND:
 228         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 229                 priv->dssdev->driver->audio_stop(priv->dssdev);
 230                 break;
 231         default:
 232                 err = -EINVAL;
 233         }
 234         return err;
 235 }
 236
 237 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 238                                 struct snd_soc_dai *dai)
 239 {
 240         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 241
 242         priv->dssdev->driver->audio_disable(priv->dssdev);
 243 }
 244
 245 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
 246         .startup        = omap_hdmi_dai_startup,
 247         .hw_params      = omap_hdmi_dai_hw_params,
 248         .prepare        = omap_hdmi_dai_prepare,
 249         .trigger        = omap_hdmi_dai_trigger,
 250         .shutdown       = omap_hdmi_dai_shutdown,
 251 };
 252
 253 static struct snd_soc_dai_driver omap_hdmi_dai = {
 254         .playback = {
 255                 .channels_min = 2,
 256                 .channels_max = 8,
 257                 .rates = OMAP_HDMI_RATES,
 258                 .formats = OMAP_HDMI_FORMATS,
 259         },
 260         .ops = &omap_hdmi_dai_ops,
 261 };
 262
 263 static const struct snd_soc_component_driver omap_hdmi_component = {
 264         .name           = DRV_NAME,
 265 };
 266
 267 static int omap_hdmi_probe(struct platform_device *pdev)
 268 {
 269         int ret;
 270         struct resource *hdmi_rsrc;
 271         struct hdmi_priv *hdmi_data;
 272         bool hdmi_dev_found = false;
 273
 274         hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
 275         if (hdmi_data == NULL) {
 276                 dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
 277                 return -ENOMEM;
 278         }
 279
 280         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 281         if (!hdmi_rsrc) {
 282                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
 283                 return -ENODEV;
 284         }
 285
 286         hdmi_data->dma_data.addr = hdmi_rsrc->start + OMAP_HDMI_AUDIO_DMA_PORT;
 287
 288         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 289         if (!hdmi_rsrc) {
 290                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
 291                 return -ENODEV;
 292         }
 293
 294         hdmi_data->dma_req = hdmi_rsrc->start;
 295         hdmi_data->dma_data.filter_data = &hdmi_data->dma_req;
 296         hdmi_data->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 297
 298         /*
 299          * TODO: We assume that there is only one DSS HDMI device. Future
 300          * OMAP implementations may support more than one HDMI devices and
 301          * we should provided separate audio support for all of them.
 302          */
 303         /* Find an HDMI device. */
 304         for_each_dss_dev(hdmi_data->dssdev) {
 305                 omap_dss_get_device(hdmi_data->dssdev);
 306
 307                 if (!hdmi_data->dssdev->driver) {
 308                         omap_dss_put_device(hdmi_data->dssdev);
 309                         continue;
 310                 }
 311
 312                 if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
 313                         hdmi_dev_found = true;
 314                         break;
 315                 }
 316         }
 317
 318         if (!hdmi_dev_found) {
 319                 dev_err(&pdev->dev, "no driver for HDMI display found\n");
 320                 return -ENODEV;
 321         }
 322
 323         dev_set_drvdata(&pdev->dev, hdmi_data);
 324         ret = snd_soc_register_component(&pdev->dev, &omap_hdmi_component,
 325                                          &omap_hdmi_dai, 1);
 326
 327         return ret;
 328 }
 329
 330 static int omap_hdmi_remove(struct platform_device *pdev)
 331 {
 332         struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
 333
 334         snd_soc_unregister_component(&pdev->dev);
 335
 336         if (hdmi_data == NULL) {
 337                 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
 338                 return -ENODEV;
 339         }
 340
 341         omap_dss_put_device(hdmi_data->dssdev);
 342         return 0;
 343 }
 344
 345 static struct platform_driver hdmi_dai_driver = {
 346         .driver = {
 347                 .name = DRV_NAME,
 348                 .owner = THIS_MODULE,
 349         },
 350         .probe = omap_hdmi_probe,
 351         .remove = omap_hdmi_remove,
 352 };
 353
 354 module_platform_driver(hdmi_dai_driver);
 355
 356 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
 357 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 358 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
 359 MODULE_LICENSE("GPL");
 360 MODULE_ALIAS("platform:" DRV_NAME);