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         return 0;
  71 }
  72
  73 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
  74                                 struct snd_soc_dai *dai)
  75 {
  76         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  77
  78         return priv->dssdev->driver->audio_enable(priv->dssdev);
  79 }
  80
  81 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
  82                                     struct snd_pcm_hw_params *params,
  83                                     struct snd_soc_dai *dai)
  84 {
  85         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
  86         struct snd_aes_iec958 *iec = &priv->iec;
  87         struct snd_cea_861_aud_if *cea = &priv->cea;
  88         int err = 0;
  89
  90         switch (params_format(params)) {
  91         case SNDRV_PCM_FORMAT_S16_LE:
  92                 priv->dma_params.packet_size = 16;
  93                 break;
  94         case SNDRV_PCM_FORMAT_S24_LE:
  95                 priv->dma_params.packet_size = 32;
  96                 break;
  97         default:
  98                 dev_err(dai->dev, "format not supported!\n");
  99                 return -EINVAL;
 100         }
 101
 102         priv->dma_params.data_type = 32;
 103
 104         snd_soc_dai_set_dma_data(dai, substream,
 105                                  &priv->dma_params);
 106
 107         /*
 108          * fill the IEC-60958 channel status word
 109          */
 110
 111         /* specify IEC-60958-3 (commercial use) */
 112         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
 113
 114         /* specify that the audio is LPCM*/
 115         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
 116
 117         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
 118
 119         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
 120
 121         iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
 122
 123         iec->status[1] = IEC958_AES1_CON_GENERAL;
 124
 125         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
 126
 127         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
 128
 129         switch (params_rate(params)) {
 130         case 32000:
 131                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
 132                 break;
 133         case 44100:
 134                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
 135                 break;
 136         case 48000:
 137                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
 138                 break;
 139         case 88200:
 140                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
 141                 break;
 142         case 96000:
 143                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
 144                 break;
 145         case 176400:
 146                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
 147                 break;
 148         case 192000:
 149                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
 150                 break;
 151         default:
 152                 dev_err(dai->dev, "rate not supported!\n");
 153                 return -EINVAL;
 154         }
 155
 156         /* specify the clock accuracy */
 157         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
 158
 159         /*
 160          * specify the word length. The same word length value can mean
 161          * two different lengths. Hence, we need to specify the maximum
 162          * word length as well.
 163          */
 164         switch (params_format(params)) {
 165         case SNDRV_PCM_FORMAT_S16_LE:
 166                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 167                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 168                 break;
 169         case SNDRV_PCM_FORMAT_S24_LE:
 170                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 171                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 172                 break;
 173         default:
 174                 dev_err(dai->dev, "format not supported!\n");
 175                 return -EINVAL;
 176         }
 177
 178         /*
 179          * Fill the CEA-861 audio infoframe (see spec for details)
 180          */
 181
 182         cea->db1_ct_cc = (params_channels(params) - 1)
 183                 & CEA861_AUDIO_INFOFRAME_DB1CC;
 184         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
 185
 186         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 187         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
 188
 189         cea->db3 = 0; /* not used, all zeros */
 190
 191         /*
 192          * The OMAP HDMI IP requires to use the 8-channel channel code when
 193          * transmitting more than two channels.
 194          */
 195         if (params_channels(params) == 2)
 196                 cea->db4_ca = 0x0;
 197         else
 198                 cea->db4_ca = 0x13;
 199
 200         cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 201         /* the expression is trivial but makes clear what we are doing */
 202         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
 203
 204         priv->dss_audio.iec = iec;
 205         priv->dss_audio.cea = cea;
 206
 207         err = priv->dssdev->driver->audio_config(priv->dssdev,
 208                                                  &priv->dss_audio);
 209
 210         return err;
 211 }
 212
 213 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 214                                 struct snd_soc_dai *dai)
 215 {
 216         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 217         int err = 0;
 218
 219         switch (cmd) {
 220         case SNDRV_PCM_TRIGGER_START:
 221         case SNDRV_PCM_TRIGGER_RESUME:
 222         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 223                 err = priv->dssdev->driver->audio_start(priv->dssdev);
 224                 break;
 225         case SNDRV_PCM_TRIGGER_STOP:
 226         case SNDRV_PCM_TRIGGER_SUSPEND:
 227         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 228                 priv->dssdev->driver->audio_stop(priv->dssdev);
 229                 break;
 230         default:
 231                 err = -EINVAL;
 232         }
 233         return err;
 234 }
 235
 236 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 237                                 struct snd_soc_dai *dai)
 238 {
 239         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 240
 241         priv->dssdev->driver->audio_disable(priv->dssdev);
 242 }
 243
 244 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
 245         .startup        = omap_hdmi_dai_startup,
 246         .hw_params      = omap_hdmi_dai_hw_params,
 247         .prepare        = omap_hdmi_dai_prepare,
 248         .trigger        = omap_hdmi_dai_trigger,
 249         .shutdown       = omap_hdmi_dai_shutdown,
 250 };
 251
 252 static struct snd_soc_dai_driver omap_hdmi_dai = {
 253         .playback = {
 254                 .channels_min = 2,
 255                 .channels_max = 8,
 256                 .rates = OMAP_HDMI_RATES,
 257                 .formats = OMAP_HDMI_FORMATS,
 258         },
 259         .ops = &omap_hdmi_dai_ops,
 260 };
 261
 262 static __devinit int omap_hdmi_probe(struct platform_device *pdev)
 263 {
 264         int ret;
 265         struct resource *hdmi_rsrc;
 266         struct hdmi_priv *hdmi_data;
 267         bool hdmi_dev_found = false;
 268
 269         hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
 270         if (hdmi_data == NULL) {
 271                 dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
 272                 return -ENOMEM;
 273         }
 274
 275         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 276         if (!hdmi_rsrc) {
 277                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
 278                 return -ENODEV;
 279         }
 280
 281         hdmi_data->dma_params.port_addr =  hdmi_rsrc->start
 282                 + OMAP_HDMI_AUDIO_DMA_PORT;
 283
 284         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 285         if (!hdmi_rsrc) {
 286                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
 287                 return -ENODEV;
 288         }
 289
 290         hdmi_data->dma_params.dma_req =  hdmi_rsrc->start;
 291         hdmi_data->dma_params.name = "HDMI playback";
 292
 293         /*
 294          * TODO: We assume that there is only one DSS HDMI device. Future
 295          * OMAP implementations may support more than one HDMI devices and
 296          * we should provided separate audio support for all of them.
 297          */
 298         /* Find an HDMI device. */
 299         for_each_dss_dev(hdmi_data->dssdev) {
 300                 omap_dss_get_device(hdmi_data->dssdev);
 301
 302                 if (!hdmi_data->dssdev->driver) {
 303                         omap_dss_put_device(hdmi_data->dssdev);
 304                         continue;
 305                 }
 306
 307                 if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
 308                         hdmi_dev_found = true;
 309                         break;
 310                 }
 311         }
 312
 313         if (!hdmi_dev_found) {
 314                 dev_err(&pdev->dev, "no driver for HDMI display found\n");
 315                 return -ENODEV;
 316         }
 317
 318         dev_set_drvdata(&pdev->dev, hdmi_data);
 319         ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
 320
 321         return ret;
 322 }
 323
 324 static int __devexit omap_hdmi_remove(struct platform_device *pdev)
 325 {
 326         struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
 327
 328         snd_soc_unregister_dai(&pdev->dev);
 329
 330         if (hdmi_data == NULL) {
 331                 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
 332                 return -ENODEV;
 333         }
 334
 335         omap_dss_put_device(hdmi_data->dssdev);
 336         return 0;
 337 }
 338
 339 static struct platform_driver hdmi_dai_driver = {
 340         .driver = {
 341                 .name = DRV_NAME,
 342                 .owner = THIS_MODULE,
 343         },
 344         .probe = omap_hdmi_probe,
 345         .remove = __devexit_p(omap_hdmi_remove),
 346 };
 347
 348 module_platform_driver(hdmi_dai_driver);
 349
 350 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
 351 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 352 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
 353 MODULE_LICENSE("GPL");
 354 MODULE_ALIAS("platform:" DRV_NAME);