/*
 * soc-compress.c  --  ALSA SoC Compress
 *
 * Copyright (C) 2012 Intel Corp.
 *
 * Authors: Namarta Kohli <namartax.kohli@intel.com>
 *          Ramesh Babu K V <ramesh.babu@linux.intel.com>
 *          Vinod Koul <vinod.koul@linux.intel.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <sound/core.h>
#include <sound/compress_params.h>
#include <sound/compress_driver.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/soc-dpcm.h>

static int soc_compr_open(struct snd_compr_stream *cstream)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->startup) {
                ret = cpu_dai->driver->cops->startup(cstream, cpu_dai);
                if (ret < 0) {
                        dev_err(cpu_dai->dev, "Compress ASoC: can't open interface %s: %d\n",
                                cpu_dai->name, ret);
                        goto out;
                }
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->open) {
                ret = platform->driver->compr_ops->open(cstream);
                if (ret < 0) {
                        pr_err("compress asoc: can't open platform %s\n",
                                platform->component.name);
                        goto plat_err;
                }
        }

        if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) {
                ret = rtd->dai_link->compr_ops->startup(cstream);
                if (ret < 0) {
                        pr_err("compress asoc: %s startup failed\n", rtd->dai_link->name);
                        goto machine_err;
                }
        }

        snd_soc_runtime_activate(rtd, cstream->direction);

        mutex_unlock(&rtd->pcm_mutex);

        return 0;

machine_err:
        if (platform->driver->compr_ops && platform->driver->compr_ops->free)
                platform->driver->compr_ops->free(cstream);
plat_err:
        if (cpu_dai->driver->cops && cpu_dai->driver->cops->shutdown)
                cpu_dai->driver->cops->shutdown(cstream, cpu_dai);
out:
        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_open_fe(struct snd_compr_stream *cstream)
{
        struct snd_soc_pcm_runtime *fe = cstream->private_data;
        struct snd_pcm_substream *fe_substream =
                 fe->pcm->streams[cstream->direction].substream;
        struct snd_soc_platform *platform = fe->platform;
        struct snd_soc_dai *cpu_dai = fe->cpu_dai;
        struct snd_soc_dpcm *dpcm;
        struct snd_soc_dapm_widget_list *list;
        int stream;
        int ret = 0;

        if (cstream->direction == SND_COMPRESS_PLAYBACK)
                stream = SNDRV_PCM_STREAM_PLAYBACK;
        else
                stream = SNDRV_PCM_STREAM_CAPTURE;

        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->startup) {
                ret = cpu_dai->driver->cops->startup(cstream, cpu_dai);
                if (ret < 0) {
                        dev_err(cpu_dai->dev, "Compress ASoC: can't open interface %s: %d\n",
                                cpu_dai->name, ret);
                        goto out;
                }
        }


        if (platform->driver->compr_ops && platform->driver->compr_ops->open) {
                ret = platform->driver->compr_ops->open(cstream);
                if (ret < 0) {
                        pr_err("compress asoc: can't open platform %s\n",
                                platform->component.name);
                        goto plat_err;
                }
        }

        if (fe->dai_link->compr_ops && fe->dai_link->compr_ops->startup) {
                ret = fe->dai_link->compr_ops->startup(cstream);
                if (ret < 0) {
                        pr_err("compress asoc: %s startup failed\n", fe->dai_link->name);
                        goto machine_err;
                }
        }

        fe->dpcm[stream].runtime = fe_substream->runtime;

        ret = dpcm_path_get(fe, stream, &list);
        if (ret < 0)
                goto fe_err;
        else if (ret == 0)
                dev_dbg(fe->dev, "ASoC: %s no valid %s route\n",
                        fe->dai_link->name, stream ? "capture" : "playback");

        /* calculate valid and active FE <-> BE dpcms */
        dpcm_process_paths(fe, stream, &list, 1);

        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;

        ret = dpcm_be_dai_startup(fe, stream);
        if (ret < 0) {
                /* clean up all links */
                list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
                        dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;

                dpcm_be_disconnect(fe, stream);
                fe->dpcm[stream].runtime = NULL;
                goto path_err;
        }

        dpcm_clear_pending_state(fe, stream);
        dpcm_path_put(&list);

        fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;

        snd_soc_runtime_activate(fe, stream);

        mutex_unlock(&fe->card->mutex);

        return 0;

path_err:
        dpcm_path_put(&list);
fe_err:
        if (fe->dai_link->compr_ops && fe->dai_link->compr_ops->shutdown)
                fe->dai_link->compr_ops->shutdown(cstream);
machine_err:
        if (platform->driver->compr_ops && platform->driver->compr_ops->free)
                platform->driver->compr_ops->free(cstream);
plat_err:
        if (cpu_dai->driver->cops && cpu_dai->driver->cops->shutdown)
                cpu_dai->driver->cops->shutdown(cstream, cpu_dai);
out:
        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
        mutex_unlock(&fe->card->mutex);
        return ret;
}

/*
 * Power down the audio subsystem pmdown_time msecs after close is called.
 * This is to ensure there are no pops or clicks in between any music tracks
 * due to DAPM power cycling.
 */
static void close_delayed_work(struct work_struct *work)
{
        struct snd_soc_pcm_runtime *rtd =
                        container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
        struct snd_soc_dai *codec_dai = rtd->codec_dai;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n",
                 codec_dai->driver->playback.stream_name,
                 codec_dai->playback_active ? "active" : "inactive",
                 rtd->pop_wait ? "yes" : "no");

        /* are we waiting on this codec DAI stream */
        if (rtd->pop_wait == 1) {
                rtd->pop_wait = 0;
                snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
                                          SND_SOC_DAPM_STREAM_STOP);
        }

        mutex_unlock(&rtd->pcm_mutex);
}

static int soc_compr_free(struct snd_compr_stream *cstream)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        int stream;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (cstream->direction == SND_COMPRESS_PLAYBACK)
                stream = SNDRV_PCM_STREAM_PLAYBACK;
        else
                stream = SNDRV_PCM_STREAM_CAPTURE;

        snd_soc_runtime_deactivate(rtd, stream);

        snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);

        if (!cpu_dai->active)
                cpu_dai->rate = 0;

        if (!codec_dai->active)
                codec_dai->rate = 0;


        if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->shutdown)
                rtd->dai_link->compr_ops->shutdown(cstream);

        if (platform->driver->compr_ops && platform->driver->compr_ops->free)
                platform->driver->compr_ops->free(cstream);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->shutdown)
                cpu_dai->driver->cops->shutdown(cstream, cpu_dai);

        if (cstream->direction == SND_COMPRESS_PLAYBACK) {
                if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
                        snd_soc_dapm_stream_event(rtd,
                                        SNDRV_PCM_STREAM_PLAYBACK,
                                        SND_SOC_DAPM_STREAM_STOP);
                } else {
                        rtd->pop_wait = 1;
                        queue_delayed_work(system_power_efficient_wq,
                                           &rtd->delayed_work,
                                           msecs_to_jiffies(rtd->pmdown_time));
                }
        } else {
                /* capture streams can be powered down now */
                snd_soc_dapm_stream_event(rtd,
                        SNDRV_PCM_STREAM_CAPTURE,
                        SND_SOC_DAPM_STREAM_STOP);
        }

        mutex_unlock(&rtd->pcm_mutex);
        return 0;
}

static int soc_compr_free_fe(struct snd_compr_stream *cstream)
{
        struct snd_soc_pcm_runtime *fe = cstream->private_data;
        struct snd_soc_platform *platform = fe->platform;
        struct snd_soc_dai *cpu_dai = fe->cpu_dai;
        struct snd_soc_dpcm *dpcm;
        int stream, ret;

        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

        if (cstream->direction == SND_COMPRESS_PLAYBACK)
                stream = SNDRV_PCM_STREAM_PLAYBACK;
        else
                stream = SNDRV_PCM_STREAM_CAPTURE;

        snd_soc_runtime_deactivate(fe, stream);

        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;

        ret = dpcm_be_dai_hw_free(fe, stream);
        if (ret < 0)
                dev_err(fe->dev, "compressed hw_free failed %d\n", ret);

        ret = dpcm_be_dai_shutdown(fe, stream);

        /* mark FE's links ready to prune */
        list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
                dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;

        dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);

        fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;

        dpcm_be_disconnect(fe, stream);

        fe->dpcm[stream].runtime = NULL;

        if (fe->dai_link->compr_ops && fe->dai_link->compr_ops->shutdown)
                fe->dai_link->compr_ops->shutdown(cstream);

        if (platform->driver->compr_ops && platform->driver->compr_ops->free)
                platform->driver->compr_ops->free(cstream);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->shutdown)
                cpu_dai->driver->cops->shutdown(cstream, cpu_dai);

        mutex_unlock(&fe->card->mutex);
        return 0;
}

static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
{

        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) {
                ret = platform->driver->compr_ops->trigger(cstream, cmd);
                if (ret < 0)
                        goto out;
        }

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->trigger)
                cpu_dai->driver->cops->trigger(cstream, cmd, cpu_dai);


        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
                snd_soc_dai_digital_mute(codec_dai, 0, cstream->direction);
                break;
        case SNDRV_PCM_TRIGGER_STOP:
                snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction);
                break;
        }

out:
        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_trigger_fe(struct snd_compr_stream *cstream, int cmd)
{
        struct snd_soc_pcm_runtime *fe = cstream->private_data;
        struct snd_soc_platform *platform = fe->platform;
        struct snd_soc_dai *cpu_dai = fe->cpu_dai;
        int ret = 0, stream;

        if (cmd == SND_COMPR_TRIGGER_PARTIAL_DRAIN ||
                cmd == SND_COMPR_TRIGGER_DRAIN) {

                if (platform->driver->compr_ops &&
                    platform->driver->compr_ops->trigger)
                        return platform->driver->compr_ops->trigger(cstream,
                                                                    cmd);
        }

        if (cstream->direction == SND_COMPRESS_PLAYBACK)
                stream = SNDRV_PCM_STREAM_PLAYBACK;
        else
                stream = SNDRV_PCM_STREAM_CAPTURE;


        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->trigger) {
                ret = cpu_dai->driver->cops->trigger(cstream, cmd, cpu_dai);
                if (ret < 0)
                        goto out;
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) {
                ret = platform->driver->compr_ops->trigger(cstream, cmd);
                if (ret < 0)
                        goto out;
        }

        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;

        ret = dpcm_be_dai_trigger(fe, stream, cmd);

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
                fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
                break;
        }

out:
        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
        mutex_unlock(&fe->card->mutex);
        return ret;
}

static int soc_compr_set_params(struct snd_compr_stream *cstream,
                                        struct snd_compr_params *params)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        /* first we call set_params for the platform driver
         * this should configure the soc side
         * if the machine has compressed ops then we call that as well
         * expectation is that platform and machine will configure everything
         * for this compress path, like configuring pcm port for codec
         */
        if (cpu_dai->driver->cops && cpu_dai->driver->cops->set_params) {
                ret = cpu_dai->driver->cops->set_params(cstream, params, cpu_dai);
                if (ret < 0)
                        goto err;
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) {
                ret = platform->driver->compr_ops->set_params(cstream, params);
                if (ret < 0)
                        goto err;
        }

        if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->set_params) {
                ret = rtd->dai_link->compr_ops->set_params(cstream);
                if (ret < 0)
                        goto err;
        }

        if (cstream->direction == SND_COMPRESS_PLAYBACK)
                snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
                                        SND_SOC_DAPM_STREAM_START);
        else
                snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
                                        SND_SOC_DAPM_STREAM_START);

        /* cancel any delayed stream shutdown that is pending */
        rtd->pop_wait = 0;
        mutex_unlock(&rtd->pcm_mutex);

        cancel_delayed_work_sync(&rtd->delayed_work);

        return ret;

err:
        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
                                        struct snd_compr_params *params)
{
        struct snd_soc_pcm_runtime *fe = cstream->private_data;
        struct snd_pcm_substream *fe_substream =
                 fe->pcm->streams[cstream->direction].substream;
        struct snd_soc_platform *platform = fe->platform;
        struct snd_soc_dai *cpu_dai = fe->cpu_dai;
        int ret = 0, stream;

        if (cstream->direction == SND_COMPRESS_PLAYBACK)
                stream = SNDRV_PCM_STREAM_PLAYBACK;
        else
                stream = SNDRV_PCM_STREAM_CAPTURE;

        mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->set_params) {
                ret = cpu_dai->driver->cops->set_params(cstream, params, cpu_dai);
                if (ret < 0)
                        goto out;
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) {
                ret = platform->driver->compr_ops->set_params(cstream, params);
                if (ret < 0)
                        goto out;
        }

        if (fe->dai_link->compr_ops && fe->dai_link->compr_ops->set_params) {
                ret = fe->dai_link->compr_ops->set_params(cstream);
                if (ret < 0)
                        goto out;
        }

        /*
         * Create an empty hw_params for the BE as the machine driver must
         * fix this up to match DSP decoder and ASRC configuration.
         * I.e. machine driver fixup for compressed BE is mandatory.
         */
        memset(&fe->dpcm[fe_substream->stream].hw_params, 0,
                sizeof(struct snd_pcm_hw_params));

        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;

        ret = dpcm_be_dai_hw_params(fe, stream);
        if (ret < 0)
                goto out;

        ret = dpcm_be_dai_prepare(fe, stream);
        if (ret < 0)
                goto out;

        dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
        fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;

out:
        fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
        mutex_unlock(&fe->card->mutex);
        return ret;
}

static int soc_compr_get_params(struct snd_compr_stream *cstream,
                                        struct snd_codec *params)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->get_params) {
                ret = cpu_dai->driver->cops->get_params(cstream, params, cpu_dai);
                if (ret < 0)
                        goto err;
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->get_params)
                ret = platform->driver->compr_ops->get_params(cstream, params);

err:
        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_get_caps(struct snd_compr_stream *cstream,
                                struct snd_compr_caps *caps)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps)
                ret = platform->driver->compr_ops->get_caps(cstream, caps);

        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream,
                                struct snd_compr_codec_caps *codec)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps)
                ret = platform->driver->compr_ops->get_codec_caps(cstream, codec);

        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->ack) {
                ret = cpu_dai->driver->cops->ack(cstream, bytes, cpu_dai);
                if (ret < 0)
                        goto err;
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->ack)
                ret = platform->driver->compr_ops->ack(cstream, bytes);

err:
        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_pointer(struct snd_compr_stream *cstream,
                        struct snd_compr_tstamp *tstamp)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        int ret = 0;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->pointer)
                cpu_dai->driver->cops->pointer(cstream, tstamp, cpu_dai);

        if (platform->driver->compr_ops && platform->driver->compr_ops->pointer)
                ret = platform->driver->compr_ops->pointer(cstream, tstamp);

        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_copy(struct snd_compr_stream *cstream,
                          char __user *buf, size_t count)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        int ret = 0;

        mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

        if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
                ret = platform->driver->compr_ops->copy(cstream, buf, count);

        mutex_unlock(&rtd->pcm_mutex);
        return ret;
}

static int soc_compr_set_metadata(struct snd_compr_stream *cstream,
                                struct snd_compr_metadata *metadata)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int ret = 0;

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->set_metadata) {
                ret = cpu_dai->driver->cops->set_metadata(cstream, metadata, cpu_dai);
                if (ret < 0)
                        return ret;
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->set_metadata)
                ret = platform->driver->compr_ops->set_metadata(cstream, metadata);

        return ret;
}

static int soc_compr_get_metadata(struct snd_compr_stream *cstream,
                                struct snd_compr_metadata *metadata)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        int ret = 0;

        if (cpu_dai->driver->cops && cpu_dai->driver->cops->get_metadata) {
                ret = cpu_dai->driver->cops->get_metadata(cstream, metadata, cpu_dai);
                if (ret < 0)
                        return ret;
        }

        if (platform->driver->compr_ops && platform->driver->compr_ops->get_metadata)
                ret = platform->driver->compr_ops->get_metadata(cstream, metadata);

        return ret;
}

/* ASoC Compress operations */
static struct snd_compr_ops soc_compr_ops = {
        .open           = soc_compr_open,
        .free           = soc_compr_free,
        .set_params     = soc_compr_set_params,
        .set_metadata   = soc_compr_set_metadata,
        .get_metadata   = soc_compr_get_metadata,
        .get_params     = soc_compr_get_params,
        .trigger        = soc_compr_trigger,
        .pointer        = soc_compr_pointer,
        .ack            = soc_compr_ack,
        .get_caps       = soc_compr_get_caps,
        .get_codec_caps = soc_compr_get_codec_caps
};

/* ASoC Dynamic Compress operations */
static struct snd_compr_ops soc_compr_dyn_ops = {
        .open           = soc_compr_open_fe,
        .free           = soc_compr_free_fe,
        .set_params     = soc_compr_set_params_fe,
        .get_params     = soc_compr_get_params,
        .set_metadata   = soc_compr_set_metadata,
        .get_metadata   = soc_compr_get_metadata,
        .trigger        = soc_compr_trigger_fe,
        .pointer        = soc_compr_pointer,
        .ack            = soc_compr_ack,
        .get_caps       = soc_compr_get_caps,
        .get_codec_caps = soc_compr_get_codec_caps
};

/**
 * snd_soc_new_compress - create a new compress.
 *
 * @rtd: The runtime for which we will create compress
 * @num: the device index number (zero based - shared with normal PCMs)
 *
 * Return: 0 for success, else error.
 */
int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
{
        struct snd_soc_codec *codec = rtd->codec;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_compr *compr;
        struct snd_pcm *be_pcm;
        char new_name[64];
        int ret = 0, direction = 0;
        int playback = 0, capture = 0;

        if (rtd->num_codecs > 1) {
                dev_err(rtd->card->dev, "Multicodec not supported for compressed stream\n");
                return -EINVAL;
        }

        /* check client and interface hw capabilities */
        snprintf(new_name, sizeof(new_name), "%s %s-%d",
                        rtd->dai_link->stream_name, codec_dai->name, num);

        if (codec_dai->driver->playback.channels_min)
                playback = 1;
        if (codec_dai->driver->capture.channels_min)
                capture = 1;

        capture = capture && cpu_dai->driver->capture.channels_min;
        playback = playback && cpu_dai->driver->playback.channels_min;

        /*
         * Compress devices are unidirectional so only one of the directions
         * should be set, check for that (xor)
         */
        if (playback + capture != 1) {
                dev_err(rtd->card->dev, "Invalid direction for compress P %d, C %d\n",
                                playback, capture);
                return -EINVAL;
        }

        if(playback)
                direction = SND_COMPRESS_PLAYBACK;
        else
                direction = SND_COMPRESS_CAPTURE;

        compr = kzalloc(sizeof(*compr), GFP_KERNEL);
        if (compr == NULL) {
                snd_printk(KERN_ERR "Cannot allocate compr\n");
                return -ENOMEM;
        }

        compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
                                  GFP_KERNEL);
        if (compr->ops == NULL) {
                dev_err(rtd->card->dev, "Cannot allocate compressed ops\n");
                ret = -ENOMEM;
                goto compr_err;
        }

        if (rtd->dai_link->dynamic) {
                snprintf(new_name, sizeof(new_name), "(%s)",
                        rtd->dai_link->stream_name);

                ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
                                rtd->dai_link->dpcm_playback,
                                rtd->dai_link->dpcm_capture, &be_pcm);
                if (ret < 0) {
                        dev_err(rtd->card->dev, "ASoC: can't create compressed for %s\n",
                                rtd->dai_link->name);
                        goto compr_err;
                }

                rtd->pcm = be_pcm;
                rtd->fe_compr = 1;
                if (rtd->dai_link->dpcm_playback)
                        be_pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
                else if (rtd->dai_link->dpcm_capture)
                        be_pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
                memcpy(compr->ops, &soc_compr_dyn_ops, sizeof(soc_compr_dyn_ops));
        } else
                memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));

        /* Add copy callback for not memory mapped DSPs */
        if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
                compr->ops->copy = soc_compr_copy;

        mutex_init(&compr->lock);

        snprintf(new_name, sizeof(new_name), "%s %s-%d",
                 rtd->dai_link->stream_name,
                 rtd->codec_dai->name, num);

        ret = snd_compress_new(rtd->card->snd_card, num, direction,
                                new_name, compr);
        if (ret < 0) {
                pr_err("compress asoc: can't create compress for codec %s\n",
                        codec->component.name);
                goto compr_err;
        }

        /* DAPM dai link stream work */
        INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

        rtd->compr = compr;
        compr->private_data = rtd;

        printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
                cpu_dai->name);
        return ret;

compr_err:
        kfree(compr);
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_new_compress);