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