soc-compress.c

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/*
 * soc-compress.c  --  ALSA SoC Compress
 *
 * Copyright (C) 2012 Intel Corp.
 *
 * Authors: Namarta Kohli <[email protected]>
 *          Ramesh Babu K V <[email protected]>
 *          Vinod Koul <[email protected]>
 *
 *  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>

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;
    struct snd_soc_dai *codec_dai = rtd->codec_dai;
    int ret = 0;

    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->name);
            goto out;
        }
    }

    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;
        }
    }

    if (cstream->direction == SND_COMPRESS_PLAYBACK) {
        cpu_dai->playback_active++;
        codec_dai->playback_active++;
    } else {
        cpu_dai->capture_active++;
        codec_dai->capture_active++;
    }

    cpu_dai->active++;
    codec_dai->active++;
    rtd->codec->active++;

    return 0;

machine_err:
    if (platform->driver->compr_ops && platform->driver->compr_ops->free)
        platform->driver->compr_ops->free(cstream);
out:
    return ret;
}

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;
    struct snd_soc_codec *codec = rtd->codec;

    if (cstream->direction == SND_COMPRESS_PLAYBACK) {
        cpu_dai->playback_active--;
        codec_dai->playback_active--;
    } else {
        cpu_dai->capture_active--;
        codec_dai->capture_active--;
    }

    snd_soc_dai_digital_mute(codec_dai, 1);

    cpu_dai->active--;
    codec_dai->active--;
    codec->active--;

    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);
    cpu_dai->runtime = NULL;

    if (cstream->direction == SND_COMPRESS_PLAYBACK) {
        if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
            rtd->dai_link->ignore_pmdown_time) {
            snd_soc_dapm_stream_event(rtd,
                    SNDRV_PCM_STREAM_PLAYBACK,
                    SND_SOC_DAPM_STREAM_STOP);
        } else
            codec_dai->pop_wait = 1;
            schedule_delayed_work(&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);
    }

    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;
    int ret = 0;

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

    if (cmd == SNDRV_PCM_TRIGGER_START)
        snd_soc_dai_digital_mute(codec_dai, 0);
    else if (cmd == SNDRV_PCM_TRIGGER_STOP)
        snd_soc_dai_digital_mute(codec_dai, 1);

    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;
    int ret = 0;

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

    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)
            return ret;
    }

    snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
                SND_SOC_DAPM_STREAM_START);

    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;
    int ret = 0;

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

    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;

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

    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;

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

    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;
    int ret = 0;

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

    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;

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

    return 0;
}

/* 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,
    .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
};

/* create a new compress */
int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dai *codec_dai = rtd->codec_dai;
    struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    struct snd_compr *compr;
    char new_name[64];
    int ret = 0, direction = 0;

    /* check client and interface hw capabilities */
    snprintf(new_name, sizeof(new_name), "%s %s-%d",
            rtd->dai_link->stream_name, codec_dai->name, num);
    direction = SND_COMPRESS_PLAYBACK;
    compr = kzalloc(sizeof(*compr), GFP_KERNEL);
    if (compr == NULL) {
        snd_printk(KERN_ERR "Cannot allocate compr\n");
        return -ENOMEM;
    }

    compr->ops = &soc_compr_ops;
    mutex_init(&compr->lock);
    ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
    if (ret < 0) {
        pr_err("compress asoc: can't create compress for codec %s\n",
            codec->name);
        kfree(compr);
        return ret;
    }

    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;
}