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 out;
 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 out;
 221         }
 222
 223         snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
 224                                 SND_SOC_DAPM_STREAM_START);
 225
 226 out:
 227         mutex_unlock(&rtd->pcm_mutex);
 228         return ret;
 229 }
 230
 231 static int soc_compr_get_params(struct snd_compr_stream *cstream,
 232                                         struct snd_codec *params)
 233 {
 234         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 235         struct snd_soc_platform *platform = rtd->platform;
 236         int ret = 0;
 237
 238         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 239
 240         if (platform->driver->compr_ops && platform->driver->compr_ops->get_params)
 241                 ret = platform->driver->compr_ops->get_params(cstream, params);
 242
 243         mutex_unlock(&rtd->pcm_mutex);
 244         return ret;
 245 }
 246
 247 static int soc_compr_get_caps(struct snd_compr_stream *cstream,
 248                                 struct snd_compr_caps *caps)
 249 {
 250         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 251         struct snd_soc_platform *platform = rtd->platform;
 252         int ret = 0;
 253
 254         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 255
 256         if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps)
 257                 ret = platform->driver->compr_ops->get_caps(cstream, caps);
 258
 259         mutex_unlock(&rtd->pcm_mutex);
 260         return ret;
 261 }
 262
 263 static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream,
 264                                 struct snd_compr_codec_caps *codec)
 265 {
 266         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 267         struct snd_soc_platform *platform = rtd->platform;
 268         int ret = 0;
 269
 270         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 271
 272         if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps)
 273                 ret = platform->driver->compr_ops->get_codec_caps(cstream, codec);
 274
 275         mutex_unlock(&rtd->pcm_mutex);
 276         return ret;
 277 }
 278
 279 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
 280 {
 281         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 282         struct snd_soc_platform *platform = rtd->platform;
 283         int ret = 0;
 284
 285         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 286
 287         if (platform->driver->compr_ops && platform->driver->compr_ops->ack)
 288                 ret = platform->driver->compr_ops->ack(cstream, bytes);
 289
 290         mutex_unlock(&rtd->pcm_mutex);
 291         return ret;
 292 }
 293
 294 static int soc_compr_pointer(struct snd_compr_stream *cstream,
 295                         struct snd_compr_tstamp *tstamp)
 296 {
 297         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 298         struct snd_soc_platform *platform = rtd->platform;
 299
 300         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 301
 302         if (platform->driver->compr_ops && platform->driver->compr_ops->pointer)
 303                  platform->driver->compr_ops->pointer(cstream, tstamp);
 304
 305         mutex_unlock(&rtd->pcm_mutex);
 306         return 0;
 307 }
 308
 309 static int soc_compr_copy(struct snd_compr_stream *cstream,
 310                           const char __user *buf, size_t count)
 311 {
 312         struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 313         struct snd_soc_platform *platform = rtd->platform;
 314         int ret = 0;
 315
 316         mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 317
 318         if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
 319                 ret = platform->driver->compr_ops->copy(cstream, buf, count);
 320
 321         mutex_unlock(&rtd->pcm_mutex);
 322         return ret;
 323 }
 324
 325 /* ASoC Compress operations */
 326 static struct snd_compr_ops soc_compr_ops = {
 327         .open           = soc_compr_open,
 328         .free           = soc_compr_free,
 329         .set_params     = soc_compr_set_params,
 330         .get_params     = soc_compr_get_params,
 331         .trigger        = soc_compr_trigger,
 332         .pointer        = soc_compr_pointer,
 333         .ack            = soc_compr_ack,
 334         .get_caps       = soc_compr_get_caps,
 335         .get_codec_caps = soc_compr_get_codec_caps
 336 };
 337
 338 /* create a new compress */
 339 int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
 340 {
 341         struct snd_soc_codec *codec = rtd->codec;
 342         struct snd_soc_platform *platform = rtd->platform;
 343         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 344         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 345         struct snd_compr *compr;
 346         char new_name[64];
 347         int ret = 0, direction = 0;
 348
 349         /* check client and interface hw capabilities */
 350         snprintf(new_name, sizeof(new_name), "%s %s-%d",
 351                         rtd->dai_link->stream_name, codec_dai->name, num);
 352         direction = SND_COMPRESS_PLAYBACK;
 353         compr = kzalloc(sizeof(*compr), GFP_KERNEL);
 354         if (compr == NULL) {
 355                 snd_printk(KERN_ERR "Cannot allocate compr\n");
 356                 return -ENOMEM;
 357         }
 358
 359         compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
 360                                   GFP_KERNEL);
 361         if (compr->ops == NULL) {
 362                 dev_err(rtd->card->dev, "Cannot allocate compressed ops\n");
 363                 ret = -ENOMEM;
 364                 goto compr_err;
 365         }
 366         memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));
 367
 368         /* Add copy callback for not memory mapped DSPs */
 369         if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
 370                 compr->ops->copy = soc_compr_copy;
 371
 372         mutex_init(&compr->lock);
 373         ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
 374         if (ret < 0) {
 375                 pr_err("compress asoc: can't create compress for codec %s\n",
 376                         codec->name);
 377                 goto compr_err;
 378         }
 379
 380         /* DAPM dai link stream work */
 381         INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
 382
 383         rtd->compr = compr;
 384         compr->private_data = rtd;
 385
 386         printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
 387                 cpu_dai->name);
 388         return ret;
 389
 390 compr_err:
 391         kfree(compr);
 392         return ret;
 393 }