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 <video/omapdss.h>
  36
  37 #include "omap-pcm.h"
  38 #include "omap-hdmi.h"
  39
  40 #define DRV_NAME "omap-hdmi-audio-dai"
  41
  42 struct hdmi_priv {
  43         struct omap_pcm_dma_data dma_params;
  44         struct omap_dss_audio dss_audio;
  45         struct snd_aes_iec958 iec;
  46         struct snd_cea_861_aud_if cea;
  47         struct omap_dss_device *dssdev;
  48 };
  49
  50 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
  51                                   struct snd_soc_dai *dai)
  52 {
  53         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  54         int err;
  55         /*
  56          * Make sure that the period bytes are multiple of the DMA packet size.
  57          * Largest packet size we use is 32 32-bit words = 128 bytes
  58          */
  59         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
  60                                  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
  61         if (err < 0) {
  62                 dev_err(dai->dev, "could not apply constraint\n");
  63                 return err;
  64         }
  65
  66         if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
  67                 dev_err(dai->dev, "audio not supported\n");
  68                 return -ENODEV;
  69         }
  70
  71         snd_soc_dai_set_dma_data(dai, substream, &priv->dma_params);
  72
  73         return 0;
  74 }
  75
  76 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
  77                                 struct snd_soc_dai *dai)
  78 {
  79         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  80
  81         return priv->dssdev->driver->audio_enable(priv->dssdev);
  82 }
  83
  84 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
  85                                     struct snd_pcm_hw_params *params,
  86                                     struct snd_soc_dai *dai)
  87 {
  88         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  89         struct snd_aes_iec958 *iec = &priv->iec;
  90         struct snd_cea_861_aud_if *cea = &priv->cea;
  91         struct omap_pcm_dma_data *dma_data;
  92         int err = 0;
  93
  94         dma_data = snd_soc_dai_get_dma_data(dai, substream);
  95
  96         switch (params_format(params)) {
  97         case SNDRV_PCM_FORMAT_S16_LE:
  98                 dma_data->packet_size = 16;
  99                 break;
 100         case SNDRV_PCM_FORMAT_S24_LE:
 101                 dma_data->packet_size = 32;
 102                 break;
 103         default:
 104                 dev_err(dai->dev, "format not supported!\n");
 105                 return -EINVAL;
 106         }
 107
 108         dma_data->data_type = 32;
 109
 110         /*
 111          * fill the IEC-60958 channel status word
 112          */
 113         /* initialize the word bytes */
 114         memset(iec->status, 0, sizeof(iec->status));
 115
 116         /* specify IEC-60958-3 (commercial use) */
 117         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
 118
 119         /* specify that the audio is LPCM*/
 120         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
 121
 122         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
 123
 124         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
 125
 126         iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
 127
 128         iec->status[1] = IEC958_AES1_CON_GENERAL;
 129
 130         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
 131
 132         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
 133
 134         switch (params_rate(params)) {
 135         case 32000:
 136                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
 137                 break;
 138         case 44100:
 139                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
 140                 break;
 141         case 48000:
 142                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
 143                 break;
 144         case 88200:
 145                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
 146                 break;
 147         case 96000:
 148                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
 149                 break;
 150         case 176400:
 151                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
 152                 break;
 153         case 192000:
 154                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
 155                 break;
 156         default:
 157                 dev_err(dai->dev, "rate not supported!\n");
 158                 return -EINVAL;
 159         }
 160
 161         /* specify the clock accuracy */
 162         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
 163
 164         /*
 165          * specify the word length. The same word length value can mean
 166          * two different lengths. Hence, we need to specify the maximum
 167          * word length as well.
 168          */
 169         switch (params_format(params)) {
 170         case SNDRV_PCM_FORMAT_S16_LE:
 171                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 172                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 173                 break;
 174         case SNDRV_PCM_FORMAT_S24_LE:
 175                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 176                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 177                 break;
 178         default:
 179                 dev_err(dai->dev, "format not supported!\n");
 180                 return -EINVAL;
 181         }
 182
 183         /*
 184          * Fill the CEA-861 audio infoframe (see spec for details)
 185          */
 186
 187         cea->db1_ct_cc = (params_channels(params) - 1)
 188                 & CEA861_AUDIO_INFOFRAME_DB1CC;
 189         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
 190
 191         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 192         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
 193
 194         cea->db3 = 0; /* not used, all zeros */
 195
 196         /*
 197          * The OMAP HDMI IP requires to use the 8-channel channel code when
 198          * transmitting more than two channels.
 199          */
 200         if (params_channels(params) == 2)
 201                 cea->db4_ca = 0x0;
 202         else
 203                 cea->db4_ca = 0x13;
 204
 205         cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 206         /* the expression is trivial but makes clear what we are doing */
 207         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
 208
 209         priv->dss_audio.iec = iec;
 210         priv->dss_audio.cea = cea;
 211
 212         err = priv->dssdev->driver->audio_config(priv->dssdev,
 213                                                  &priv->dss_audio);
 214
 215         return err;
 216 }
 217
 218 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 219                                 struct snd_soc_dai *dai)
 220 {
 221         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 222         int err = 0;
 223
 224         switch (cmd) {
 225         case SNDRV_PCM_TRIGGER_START:
 226         case SNDRV_PCM_TRIGGER_RESUME:
 227         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 228                 err = priv->dssdev->driver->audio_start(priv->dssdev);
 229                 break;
 230         case SNDRV_PCM_TRIGGER_STOP:
 231         case SNDRV_PCM_TRIGGER_SUSPEND:
 232         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 233                 priv->dssdev->driver->audio_stop(priv->dssdev);
 234                 break;
 235         default:
 236                 err = -EINVAL;
 237         }
 238         return err;
 239 }
 240
 241 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 242                                 struct snd_soc_dai *dai)
 243 {
 244         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 245
 246         priv->dssdev->driver->audio_disable(priv->dssdev);
 247 }
 248
 249 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
 250         .startup        = omap_hdmi_dai_startup,
 251         .hw_params      = omap_hdmi_dai_hw_params,
 252         .prepare        = omap_hdmi_dai_prepare,
 253         .trigger        = omap_hdmi_dai_trigger,
 254         .shutdown       = omap_hdmi_dai_shutdown,
 255 };
 256
 257 static struct snd_soc_dai_driver omap_hdmi_dai = {
 258         .playback = {
 259                 .channels_min = 2,
 260                 .channels_max = 8,
 261                 .rates = OMAP_HDMI_RATES,
 262                 .formats = OMAP_HDMI_FORMATS,
 263         },
 264         .ops = &omap_hdmi_dai_ops,
 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_params.port_addr =  hdmi_rsrc->start
 287                 + OMAP_HDMI_AUDIO_DMA_PORT;
 288
 289         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 290         if (!hdmi_rsrc) {
 291                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
 292                 return -ENODEV;
 293         }
 294
 295         hdmi_data->dma_params.dma_req =  hdmi_rsrc->start;
 296         hdmi_data->dma_params.name = "HDMI playback";
 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_dai(&pdev->dev, &omap_hdmi_dai);
 325
 326         return ret;
 327 }
 328
 329 static int omap_hdmi_remove(struct platform_device *pdev)
 330 {
 331         struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
 332
 333         snd_soc_unregister_dai(&pdev->dev);
 334
 335         if (hdmi_data == NULL) {
 336                 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
 337                 return -ENODEV;
 338         }
 339
 340         omap_dss_put_device(hdmi_data->dssdev);
 341         return 0;
 342 }
 343
 344 static struct platform_driver hdmi_dai_driver = {
 345         .driver = {
 346                 .name = DRV_NAME,
 347                 .owner = THIS_MODULE,
 348         },
 349         .probe = omap_hdmi_probe,
 350         .remove = omap_hdmi_remove,
 351 };
 352
 353 module_platform_driver(hdmi_dai_driver);
 354
 355 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
 356 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 357 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
 358 MODULE_LICENSE("GPL");
 359 MODULE_ALIAS("platform:" DRV_NAME);