sound/soc/soc-compress.c

   1 /*
   2  * soc-compress.c  --  ALSA SoC Compress
   3  *
   4  * Copyright (C) 2012 Intel Corp.
   5  *
   6  * Authors: Namarta Kohli <namartax.kohli@intel.com>
   7  *          Ramesh Babu K V <ramesh.babu@linux.intel.com>
   8  *          Vinod Koul <vinod.koul@linux.intel.com>
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20 #include <linux/slab.h>
  21 #include <linux/workqueue.h>
  22 #include <sound/core.h>
  23 #include <sound/compress_params.h>
  24 #include <sound/compress_driver.h>
  25 #include <sound/soc.h>
  26 #include <sound/initval.h>
  27
  28 static int soc_compr_open(struct snd_compr_stream *cstream)
  29 {
  30         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
  31         struct snd_soc_platform *platform = rtd->platform;
  32         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  33         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  34         int ret = 0;
  35
  36         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
  37
  38         if (platform->driver->compr_ops && platform->driver->compr_ops->open) {
  39                 ret = platform->driver->compr_ops->open(cstream);
  40                 if (ret < 0) {
  41                         pr_err("compress asoc: can't open platform %s\n", platform->name);
  42                         goto out;
  43                 }
  44         }
  45
  46         if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) {
  47                 ret = rtd->dai_link->compr_ops->startup(cstream);
  48                 if (ret < 0) {
  49                         pr_err("compress asoc: %s startup failed\n", rtd->dai_link->name);
  50                         goto machine_err;
  51                 }
  52         }
  53
  54         if (cstream->direction == SND_COMPRESS_PLAYBACK) {
  55                 cpu_dai->playback_active++;
  56                 codec_dai->playback_active++;
  57         } else {
  58                 cpu_dai->capture_active++;
  59                 codec_dai->capture_active++;
  60         }
  61
  62         cpu_dai->active++;
  63         codec_dai->active++;
  64         rtd->codec->active++;
  65
  66         mutex_unlock(&rtd->pcm_mutex);
  67
  68         return 0;
  69
  70 machine_err:
  71         if (platform->driver->compr_ops && platform->driver->compr_ops->free)
  72                 platform->driver->compr_ops->free(cstream);
  73 out:
  74         mutex_unlock(&rtd->pcm_mutex);
  75         return ret;
  76 }
  77
  78 /*
  79  * Power down the audio subsystem pmdown_time msecs after close is called.
  80  * This is to ensure there are no pops or clicks in between any music tracks
  81  * due to DAPM power cycling.
  82  */
  83 static void close_delayed_work(struct work_struct *work)
  84 {
  85         struct snd_soc_pcm_runtime *rtd =
  86                         container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
  87         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  88
  89         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
  90
  91         dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
  92                  codec_dai->driver->playback.stream_name,
  93                  codec_dai->playback_active ? "active" : "inactive",
  94                  rtd->pop_wait ? "yes" : "no");
  95
  96         /* are we waiting on this codec DAI stream */
  97         if (rtd->pop_wait == 1) {
  98                 rtd->pop_wait = 0;
  99                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 100                                           SND_SOC_DAPM_STREAM_STOP);
 101         }
 102
 103         mutex_unlock(&rtd->pcm_mutex);
 104 }
 105
 106 static int soc_compr_free(struct snd_compr_stream *cstream)
 107 {
 108         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 109         struct snd_soc_platform *platform = rtd->platform;
 110         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 111         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 112         struct snd_soc_codec *codec = rtd->codec;
 113
 114         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 115
 116         if (cstream->direction == SND_COMPRESS_PLAYBACK) {
 117                 cpu_dai->playback_active--;
 118                 codec_dai->playback_active--;
 119         } else {
 120                 cpu_dai->capture_active--;
 121                 codec_dai->capture_active--;
 122         }
 123
 124         snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);
 125
 126         cpu_dai->active--;
 127         codec_dai->active--;
 128         codec->active--;
 129
 130         if (!cpu_dai->active)
 131                 cpu_dai->rate = 0;
 132
 133         if (!codec_dai->active)
 134                 codec_dai->rate = 0;
 135
 136
 137         if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->shutdown)
 138                 rtd->dai_link->compr_ops->shutdown(cstream);
 139
 140         if (platform->driver->compr_ops && platform->driver->compr_ops->free)
 141                 platform->driver->compr_ops->free(cstream);
 142         cpu_dai->runtime = NULL;
 143
 144         if (cstream->direction == SND_COMPRESS_PLAYBACK) {
 145                 if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
 146                     rtd->dai_link->ignore_pmdown_time) {
 147                         snd_soc_dapm_stream_event(rtd,
 148                                         SNDRV_PCM_STREAM_PLAYBACK,
 149                                         SND_SOC_DAPM_STREAM_STOP);
 150                 } else {
 151                         rtd->pop_wait = 1;
 152                         schedule_delayed_work(&rtd->delayed_work,
 153                                 msecs_to_jiffies(rtd->pmdown_time));
 154                 }
 155         } else {
 156                 /* capture streams can be powered down now */
 157                 snd_soc_dapm_stream_event(rtd,
 158                         SNDRV_PCM_STREAM_CAPTURE,
 159                         SND_SOC_DAPM_STREAM_STOP);
 160         }
 161
 162         mutex_unlock(&rtd->pcm_mutex);
 163         return 0;
 164 }
 165
 166 static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
 167 {
 168
 169         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 170         struct snd_soc_platform *platform = rtd->platform;
 171         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 172         int ret = 0;
 173
 174         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 175
 176         if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) {
 177                 ret = platform->driver->compr_ops->trigger(cstream, cmd);
 178                 if (ret < 0)
 179                         goto out;
 180         }
 181
 182         switch (cmd) {
 183         case SNDRV_PCM_TRIGGER_START:
 184                 snd_soc_dai_digital_mute(codec_dai, 0, cstream->direction);
 185                 break;
 186         case SNDRV_PCM_TRIGGER_STOP:
 187                 snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);
 188                 break;
 189         }
 190
 191 out:
 192         mutex_unlock(&rtd->pcm_mutex);
 193         return ret;
 194 }
 195
 196 static int soc_compr_set_params(struct snd_compr_stream *cstream,
 197                                         struct snd_compr_params *params)
 198 {
 199         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 200         struct snd_soc_platform *platform = rtd->platform;
 201         int ret = 0;
 202
 203         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 204
 205         /* first we call set_params for the platform driver
 206          * this should configure the soc side
 207          * if the machine has compressed ops then we call that as well
 208          * expectation is that platform and machine will configure everything
 209          * for this compress path, like configuring pcm port for codec
 210          */
 211         if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) {
 212                 ret = platform->driver->compr_ops->set_params(cstream, params);
 213                 if (ret < 0)
 214                         goto err;
 215         }
 216
 217         if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->set_params) {
 218                 ret = rtd->dai_link->compr_ops->set_params(cstream);
 219                 if (ret < 0)
 220                         goto err;
 221         }
 222
 223         if (cstream->direction == SND_COMPRESS_PLAYBACK)
 224                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 225                                         SND_SOC_DAPM_STREAM_START);
 226         else
 227                 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
 228                                         SND_SOC_DAPM_STREAM_START);
 229
 230         /* cancel any delayed stream shutdown that is pending */
 231         rtd->pop_wait = 0;
 232         mutex_unlock(&rtd->pcm_mutex);
 233
 234         cancel_delayed_work_sync(&rtd->delayed_work);
 235
 236         return ret;
 237
 238 err:
 239         mutex_unlock(&rtd->pcm_mutex);
 240         return ret;
 241 }
 242
 243 static int soc_compr_get_params(struct snd_compr_stream *cstream,
 244                                         struct snd_codec *params)
 245 {
 246         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 247         struct snd_soc_platform *platform = rtd->platform;
 248         int ret = 0;
 249
 250         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 251
 252         if (platform->driver->compr_ops && platform->driver->compr_ops->get_params)
 253                 ret = platform->driver->compr_ops->get_params(cstream, params);
 254
 255         mutex_unlock(&rtd->pcm_mutex);
 256         return ret;
 257 }
 258
 259 static int soc_compr_get_caps(struct snd_compr_stream *cstream,
 260                                 struct snd_compr_caps *caps)
 261 {
 262         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 263         struct snd_soc_platform *platform = rtd->platform;
 264         int ret = 0;
 265
 266         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 267
 268         if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps)
 269                 ret = platform->driver->compr_ops->get_caps(cstream, caps);
 270
 271         mutex_unlock(&rtd->pcm_mutex);
 272         return ret;
 273 }
 274
 275 static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream,
 276                                 struct snd_compr_codec_caps *codec)
 277 {
 278         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 279         struct snd_soc_platform *platform = rtd->platform;
 280         int ret = 0;
 281
 282         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 283
 284         if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps)
 285                 ret = platform->driver->compr_ops->get_codec_caps(cstream, codec);
 286
 287         mutex_unlock(&rtd->pcm_mutex);
 288         return ret;
 289 }
 290
 291 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
 292 {
 293         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 294         struct snd_soc_platform *platform = rtd->platform;
 295         int ret = 0;
 296
 297         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 298
 299         if (platform->driver->compr_ops && platform->driver->compr_ops->ack)
 300                 ret = platform->driver->compr_ops->ack(cstream, bytes);
 301
 302         mutex_unlock(&rtd->pcm_mutex);
 303         return ret;
 304 }
 305
 306 static int soc_compr_pointer(struct snd_compr_stream *cstream,
 307                         struct snd_compr_tstamp *tstamp)
 308 {
 309         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 310         struct snd_soc_platform *platform = rtd->platform;
 311
 312         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 313
 314         if (platform->driver->compr_ops && platform->driver->compr_ops->pointer)
 315                  platform->driver->compr_ops->pointer(cstream, tstamp);
 316
 317         mutex_unlock(&rtd->pcm_mutex);
 318         return 0;
 319 }
 320
 321 static int soc_compr_copy(struct snd_compr_stream *cstream,
 322                           char __user *buf, size_t count)
 323 {
 324         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 325         struct snd_soc_platform *platform = rtd->platform;
 326         int ret = 0;
 327
 328         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 329
 330         if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
 331                 ret = platform->driver->compr_ops->copy(cstream, buf, count);
 332
 333         mutex_unlock(&rtd->pcm_mutex);
 334         return ret;
 335 }
 336
 337 static int sst_compr_set_metadata(struct snd_compr_stream *cstream,
 338                                 struct snd_compr_metadata *metadata)
 339 {
 340         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 341         struct snd_soc_platform *platform = rtd->platform;
 342         int ret = 0;
 343
 344         if (platform->driver->compr_ops && platform->driver->compr_ops->set_metadata)
 345                 ret = platform->driver->compr_ops->set_metadata(cstream, metadata);
 346
 347         return ret;
 348 }
 349
 350 static int sst_compr_get_metadata(struct snd_compr_stream *cstream,
 351                                 struct snd_compr_metadata *metadata)
 352 {
 353         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 354         struct snd_soc_platform *platform = rtd->platform;
 355         int ret = 0;
 356
 357         if (platform->driver->compr_ops && platform->driver->compr_ops->get_metadata)
 358                 ret = platform->driver->compr_ops->get_metadata(cstream, metadata);
 359
 360         return ret;
 361 }
 362 /* ASoC Compress operations */
 363 static struct snd_compr_ops soc_compr_ops = {
 364         .open           = soc_compr_open,
 365         .free           = soc_compr_free,
 366         .set_params     = soc_compr_set_params,
 367         .set_metadata   = sst_compr_set_metadata,
 368         .get_metadata   = sst_compr_get_metadata,
 369         .get_params     = soc_compr_get_params,
 370         .trigger        = soc_compr_trigger,
 371         .pointer        = soc_compr_pointer,
 372         .ack            = soc_compr_ack,
 373         .get_caps       = soc_compr_get_caps,
 374         .get_codec_caps = soc_compr_get_codec_caps
 375 };
 376
 377 /* create a new compress */
 378 int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
 379 {
 380         struct snd_soc_codec *codec = rtd->codec;
 381         struct snd_soc_platform *platform = rtd->platform;
 382         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 383         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 384         struct snd_compr *compr;
 385         char new_name[64];
 386         int ret = 0, direction = 0;
 387
 388         /* check client and interface hw capabilities */
 389         snprintf(new_name, sizeof(new_name), "%s %s-%d",
 390                         rtd->dai_link->stream_name, codec_dai->name, num);
 391
 392         if (codec_dai->driver->playback.channels_min)
 393                 direction = SND_COMPRESS_PLAYBACK;
 394         else if (codec_dai->driver->capture.channels_min)
 395                 direction = SND_COMPRESS_CAPTURE;
 396         else
 397                 return -EINVAL;
 398
 399         compr = kzalloc(sizeof(*compr), GFP_KERNEL);
 400         if (compr == NULL) {
 401                 snd_printk(KERN_ERR "Cannot allocate compr\n");
 402                 return -ENOMEM;
 403         }
 404
 405         compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
 406                                   GFP_KERNEL);
 407         if (compr->ops == NULL) {
 408                 dev_err(rtd->card->dev, "Cannot allocate compressed ops\n");
 409                 ret = -ENOMEM;
 410                 goto compr_err;
 411         }
 412         memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));
 413
 414         /* Add copy callback for not memory mapped DSPs */
 415         if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
 416                 compr->ops->copy = soc_compr_copy;
 417
 418         mutex_init(&compr->lock);
 419         ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
 420         if (ret < 0) {
 421                 pr_err("compress asoc: can't create compress for codec %s\n",
 422                         codec->name);
 423                 goto compr_err;
 424         }
 425
 426         /* DAPM dai link stream work */
 427         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
 428
 429         rtd->compr = compr;
 430         compr->private_data = rtd;
 431
 432         printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
 433                 cpu_dai->name);
 434         return ret;
 435
 436 compr_err:
 437         kfree(compr);
 438         return ret;
 439 }