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