soc-pcm.c 64.3 KB
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/*
 * soc-pcm.c  --  ALSA SoC PCM
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Copyright 2005 Openedhand Ltd.
 * Copyright (C) 2010 Slimlogic Ltd.
 * Copyright (C) 2010 Texas Instruments Inc.
 *
 * Authors: Liam Girdwood <lrg@ti.com>
 *          Mark Brown <broonie@opensource.wolfsonmicro.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>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
#include <linux/workqueue.h>
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#include <linux/export.h>
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#include <linux/debugfs.h>
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#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
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#include <sound/soc-dpcm.h>
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#include <sound/initval.h>

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#define DPCM_MAX_BE_USERS	8

/* DPCM stream event, send event to FE and all active BEs. */
static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
	int event)
{
	struct snd_soc_dpcm *dpcm;

	list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;

		dev_dbg(be->dev, "pm: BE %s event %d dir %d\n",
				be->dai_link->name, event, dir);

		snd_soc_dapm_stream_event(be, dir, event);
	}

	snd_soc_dapm_stream_event(fe, dir, event);

	return 0;
}

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static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
					struct snd_soc_dai *soc_dai)
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{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret;

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	if (!soc_dai->driver->symmetric_rates &&
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	    !rtd->dai_link->symmetric_rates)
		return 0;

	/* This can happen if multiple streams are starting simultaneously -
	 * the second can need to get its constraints before the first has
	 * picked a rate.  Complain and allow the application to carry on.
	 */
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	if (!soc_dai->rate) {
		dev_warn(soc_dai->dev,
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			 "Not enforcing symmetric_rates due to race\n");
		return 0;
	}

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	dev_dbg(soc_dai->dev, "Symmetry forces %dHz rate\n", soc_dai->rate);
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	ret = snd_pcm_hw_constraint_minmax(substream->runtime,
					   SNDRV_PCM_HW_PARAM_RATE,
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					   soc_dai->rate, soc_dai->rate);
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	if (ret < 0) {
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		dev_err(soc_dai->dev,
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			"Unable to apply rate symmetry constraint: %d\n", ret);
		return ret;
	}

	return 0;
}

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/*
 * List of sample sizes that might go over the bus for parameter
 * application.  There ought to be a wildcard sample size for things
 * like the DAC/ADC resolution to use but there isn't right now.
 */
static int sample_sizes[] = {
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	24, 32,
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};

static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	int ret, i, bits;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		bits = dai->driver->playback.sig_bits;
	else
		bits = dai->driver->capture.sig_bits;

	if (!bits)
		return;

	for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
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		if (bits >= sample_sizes[i])
			continue;

		ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
						   sample_sizes[i], bits);
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		if (ret != 0)
			dev_warn(dai->dev,
				 "Failed to set MSB %d/%d: %d\n",
				 bits, sample_sizes[i], ret);
	}
}

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/*
 * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 * then initialized and any private data can be allocated. This also calls
 * startup for the cpu DAI, platform, machine and codec DAI.
 */
static int soc_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	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_dai_driver *cpu_dai_drv = cpu_dai->driver;
	struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
	int ret = 0;

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	pm_runtime_get_sync(cpu_dai->dev);
	pm_runtime_get_sync(codec_dai->dev);
	pm_runtime_get_sync(platform->dev);

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	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
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	/* startup the audio subsystem */
	if (cpu_dai->driver->ops->startup) {
		ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
		if (ret < 0) {
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			dev_err(cpu_dai->dev, "can't open interface %s: %d\n",
				cpu_dai->name, ret);
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			goto out;
		}
	}

	if (platform->driver->ops && platform->driver->ops->open) {
		ret = platform->driver->ops->open(substream);
		if (ret < 0) {
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			dev_err(platform->dev, "can't open platform %s: %d\n",
				platform->name, ret);
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			goto platform_err;
		}
	}

	if (codec_dai->driver->ops->startup) {
		ret = codec_dai->driver->ops->startup(substream, codec_dai);
		if (ret < 0) {
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			dev_err(codec_dai->dev, "can't open codec %s: %d\n",
				codec_dai->name, ret);
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			goto codec_dai_err;
		}
	}

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

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	/* Dynamic PCM DAI links compat checks use dynamic capabilities */
	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
		goto dynamic;

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	/* Check that the codec and cpu DAIs are compatible */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		runtime->hw.rate_min =
			max(codec_dai_drv->playback.rate_min,
			    cpu_dai_drv->playback.rate_min);
		runtime->hw.rate_max =
			min(codec_dai_drv->playback.rate_max,
			    cpu_dai_drv->playback.rate_max);
		runtime->hw.channels_min =
			max(codec_dai_drv->playback.channels_min,
				cpu_dai_drv->playback.channels_min);
		runtime->hw.channels_max =
			min(codec_dai_drv->playback.channels_max,
				cpu_dai_drv->playback.channels_max);
		runtime->hw.formats =
			codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
		runtime->hw.rates =
			codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
		if (codec_dai_drv->playback.rates
			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
			runtime->hw.rates |= cpu_dai_drv->playback.rates;
		if (cpu_dai_drv->playback.rates
			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
			runtime->hw.rates |= codec_dai_drv->playback.rates;
	} else {
		runtime->hw.rate_min =
			max(codec_dai_drv->capture.rate_min,
			    cpu_dai_drv->capture.rate_min);
		runtime->hw.rate_max =
			min(codec_dai_drv->capture.rate_max,
			    cpu_dai_drv->capture.rate_max);
		runtime->hw.channels_min =
			max(codec_dai_drv->capture.channels_min,
				cpu_dai_drv->capture.channels_min);
		runtime->hw.channels_max =
			min(codec_dai_drv->capture.channels_max,
				cpu_dai_drv->capture.channels_max);
		runtime->hw.formats =
			codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
		runtime->hw.rates =
			codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
		if (codec_dai_drv->capture.rates
			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
			runtime->hw.rates |= cpu_dai_drv->capture.rates;
		if (cpu_dai_drv->capture.rates
			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
			runtime->hw.rates |= codec_dai_drv->capture.rates;
	}

	ret = -EINVAL;
	snd_pcm_limit_hw_rates(runtime);
	if (!runtime->hw.rates) {
		printk(KERN_ERR "asoc: %s <-> %s No matching rates\n",
			codec_dai->name, cpu_dai->name);
		goto config_err;
	}
	if (!runtime->hw.formats) {
		printk(KERN_ERR "asoc: %s <-> %s No matching formats\n",
			codec_dai->name, cpu_dai->name);
		goto config_err;
	}
	if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
	    runtime->hw.channels_min > runtime->hw.channels_max) {
		printk(KERN_ERR "asoc: %s <-> %s No matching channels\n",
				codec_dai->name, cpu_dai->name);
		goto config_err;
	}

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	soc_pcm_apply_msb(substream, codec_dai);
	soc_pcm_apply_msb(substream, cpu_dai);

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	/* Symmetry only applies if we've already got an active stream. */
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	if (cpu_dai->active) {
		ret = soc_pcm_apply_symmetry(substream, cpu_dai);
		if (ret != 0)
			goto config_err;
	}

	if (codec_dai->active) {
		ret = soc_pcm_apply_symmetry(substream, codec_dai);
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		if (ret != 0)
			goto config_err;
	}

	pr_debug("asoc: %s <-> %s info:\n",
			codec_dai->name, cpu_dai->name);
	pr_debug("asoc: rate mask 0x%x\n", runtime->hw.rates);
	pr_debug("asoc: min ch %d max ch %d\n", runtime->hw.channels_min,
		 runtime->hw.channels_max);
	pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
		 runtime->hw.rate_max);

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dynamic:
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	if (substream->stream == SNDRV_PCM_STREAM_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++;
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	mutex_unlock(&rtd->pcm_mutex);
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	return 0;

config_err:
	if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
		rtd->dai_link->ops->shutdown(substream);

machine_err:
	if (codec_dai->driver->ops->shutdown)
		codec_dai->driver->ops->shutdown(substream, codec_dai);

codec_dai_err:
	if (platform->driver->ops && platform->driver->ops->close)
		platform->driver->ops->close(substream);

platform_err:
	if (cpu_dai->driver->ops->shutdown)
		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
out:
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	mutex_unlock(&rtd->pcm_mutex);
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	pm_runtime_put(platform->dev);
	pm_runtime_put(codec_dai->dev);
	pm_runtime_put(cpu_dai->dev);

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	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;

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	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
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	pr_debug("pop wq checking: %s status: %s waiting: %s\n",
		 codec_dai->driver->playback.stream_name,
		 codec_dai->playback_active ? "active" : "inactive",
		 codec_dai->pop_wait ? "yes" : "no");

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

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	mutex_unlock(&rtd->pcm_mutex);
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}

/*
 * Called by ALSA when a PCM substream is closed. Private data can be
 * freed here. The cpu DAI, codec DAI, machine and platform are also
 * shutdown.
 */
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static int soc_pcm_close(struct snd_pcm_substream *substream)
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{
	struct snd_soc_pcm_runtime *rtd = substream->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;

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	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
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	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		cpu_dai->playback_active--;
		codec_dai->playback_active--;
	} else {
		cpu_dai->capture_active--;
		codec_dai->capture_active--;
	}

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

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	/* clear the corresponding DAIs rate when inactive */
	if (!cpu_dai->active)
		cpu_dai->rate = 0;

	if (!codec_dai->active)
		codec_dai->rate = 0;
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	/* Muting the DAC suppresses artifacts caused during digital
	 * shutdown, for example from stopping clocks.
	 */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		snd_soc_dai_digital_mute(codec_dai, 1);

	if (cpu_dai->driver->ops->shutdown)
		cpu_dai->driver->ops->shutdown(substream, cpu_dai);

	if (codec_dai->driver->ops->shutdown)
		codec_dai->driver->ops->shutdown(substream, codec_dai);

	if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
		rtd->dai_link->ops->shutdown(substream);

	if (platform->driver->ops && platform->driver->ops->close)
		platform->driver->ops->close(substream);
	cpu_dai->runtime = NULL;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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		if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
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		    rtd->dai_link->ignore_pmdown_time) {
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			/* powered down playback stream now */
			snd_soc_dapm_stream_event(rtd,
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						  SNDRV_PCM_STREAM_PLAYBACK,
						  SND_SOC_DAPM_STREAM_STOP);
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		} else {
			/* start delayed pop wq here for playback streams */
			codec_dai->pop_wait = 1;
			schedule_delayed_work(&rtd->delayed_work,
				msecs_to_jiffies(rtd->pmdown_time));
		}
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	} else {
		/* capture streams can be powered down now */
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		snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
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					  SND_SOC_DAPM_STREAM_STOP);
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	}

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	mutex_unlock(&rtd->pcm_mutex);
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	pm_runtime_put(platform->dev);
	pm_runtime_put(codec_dai->dev);
	pm_runtime_put(cpu_dai->dev);

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	return 0;
}

/*
 * Called by ALSA when the PCM substream is prepared, can set format, sample
 * rate, etc.  This function is non atomic and can be called multiple times,
 * it can refer to the runtime info.
 */
static int soc_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->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;

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	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
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	if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
		ret = rtd->dai_link->ops->prepare(substream);
		if (ret < 0) {
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			pr_err("asoc: machine prepare error: %d\n", ret);
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			goto out;
		}
	}

	if (platform->driver->ops && platform->driver->ops->prepare) {
		ret = platform->driver->ops->prepare(substream);
		if (ret < 0) {
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			dev_err(platform->dev, "platform prepare error: %d\n",
				ret);
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			goto out;
		}
	}

	if (codec_dai->driver->ops->prepare) {
		ret = codec_dai->driver->ops->prepare(substream, codec_dai);
		if (ret < 0) {
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			dev_err(codec_dai->dev, "DAI prepare error: %d\n",
				ret);
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			goto out;
		}
	}

	if (cpu_dai->driver->ops->prepare) {
		ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
		if (ret < 0) {
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			dev_err(cpu_dai->dev, "DAI prepare error: %d\n",
				ret);
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			goto out;
		}
	}

	/* cancel any delayed stream shutdown that is pending */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    codec_dai->pop_wait) {
		codec_dai->pop_wait = 0;
		cancel_delayed_work(&rtd->delayed_work);
	}

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	snd_soc_dapm_stream_event(rtd, substream->stream,
			SND_SOC_DAPM_STREAM_START);
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	snd_soc_dai_digital_mute(codec_dai, 0);

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

/*
 * Called by ALSA when the hardware params are set by application. This
 * function can also be called multiple times and can allocate buffers
 * (using snd_pcm_lib_* ). It's non-atomic.
 */
static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->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;

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	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
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	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
		ret = rtd->dai_link->ops->hw_params(substream, params);
		if (ret < 0) {
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			pr_err("asoc: machine hw_params failed: %d\n", ret);
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			goto out;
		}
	}

	if (codec_dai->driver->ops->hw_params) {
		ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
		if (ret < 0) {
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			dev_err(codec_dai->dev, "can't set %s hw params: %d\n",
				codec_dai->name, ret);
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			goto codec_err;
		}
	}

	if (cpu_dai->driver->ops->hw_params) {
		ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
		if (ret < 0) {
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			dev_err(cpu_dai->dev, "%s hw params failed: %d\n",
				cpu_dai->name, ret);
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			goto interface_err;
		}
	}

	if (platform->driver->ops && platform->driver->ops->hw_params) {
		ret = platform->driver->ops->hw_params(substream, params);
		if (ret < 0) {
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			dev_err(platform->dev, "%s hw params failed: %d\n",
			       platform->name, ret);
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			goto platform_err;
		}
	}

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	/* store the rate for each DAIs */
	cpu_dai->rate = params_rate(params);
	codec_dai->rate = params_rate(params);
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out:
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	mutex_unlock(&rtd->pcm_mutex);
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	return ret;

platform_err:
	if (cpu_dai->driver->ops->hw_free)
		cpu_dai->driver->ops->hw_free(substream, cpu_dai);

interface_err:
	if (codec_dai->driver->ops->hw_free)
		codec_dai->driver->ops->hw_free(substream, codec_dai);

codec_err:
	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
		rtd->dai_link->ops->hw_free(substream);

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

/*
 * Frees resources allocated by hw_params, can be called multiple times
 */
static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->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;

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	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
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	/* apply codec digital mute */
	if (!codec->active)
		snd_soc_dai_digital_mute(codec_dai, 1);

	/* free any machine hw params */
	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
		rtd->dai_link->ops->hw_free(substream);

	/* free any DMA resources */
	if (platform->driver->ops && platform->driver->ops->hw_free)
		platform->driver->ops->hw_free(substream);

	/* now free hw params for the DAIs  */
	if (codec_dai->driver->ops->hw_free)
		codec_dai->driver->ops->hw_free(substream, codec_dai);

	if (cpu_dai->driver->ops->hw_free)
		cpu_dai->driver->ops->hw_free(substream, cpu_dai);

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

static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_soc_pcm_runtime *rtd = substream->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;

	if (codec_dai->driver->ops->trigger) {
		ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
		if (ret < 0)
			return ret;
	}

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

	if (cpu_dai->driver->ops->trigger) {
		ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
		if (ret < 0)
			return ret;
	}
	return 0;
}

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static int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream,
				   int cmd)
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{
	struct snd_soc_pcm_runtime *rtd = substream->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;

	if (codec_dai->driver->ops->bespoke_trigger) {
		ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
		if (ret < 0)
			return ret;
	}

	if (platform->driver->bespoke_trigger) {
		ret = platform->driver->bespoke_trigger(substream, cmd);
		if (ret < 0)
			return ret;
	}

	if (cpu_dai->driver->ops->bespoke_trigger) {
		ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
		if (ret < 0)
			return ret;
	}
	return 0;
}
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/*
 * soc level wrapper for pointer callback
 * If cpu_dai, codec_dai, platform driver has the delay callback, than
 * the runtime->delay will be updated accordingly.
 */
static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->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_pcm_runtime *runtime = substream->runtime;
	snd_pcm_uframes_t offset = 0;
	snd_pcm_sframes_t delay = 0;

	if (platform->driver->ops && platform->driver->ops->pointer)
		offset = platform->driver->ops->pointer(substream);

	if (cpu_dai->driver->ops->delay)
		delay += cpu_dai->driver->ops->delay(substream, cpu_dai);

	if (codec_dai->driver->ops->delay)
		delay += codec_dai->driver->ops->delay(substream, codec_dai);

	if (platform->driver->delay)
		delay += platform->driver->delay(substream, codec_dai);

	runtime->delay = delay;

	return offset;
}

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/* connect a FE and BE */
static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
		struct snd_soc_pcm_runtime *be, int stream)
{
	struct snd_soc_dpcm *dpcm;

	/* only add new dpcms */
	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
		if (dpcm->be == be && dpcm->fe == fe)
			return 0;
	}

	dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
	if (!dpcm)
		return -ENOMEM;

	dpcm->be = be;
	dpcm->fe = fe;
	be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
	dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
	list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
	list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);

	dev_dbg(fe->dev, "  connected new DPCM %s path %s %s %s\n",
			stream ? "capture" : "playback",  fe->dai_link->name,
			stream ? "<-" : "->", be->dai_link->name);

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#ifdef CONFIG_DEBUG_FS
	dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
			fe->debugfs_dpcm_root, &dpcm->state);
#endif
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	return 1;
}

/* reparent a BE onto another FE */
static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
			struct snd_soc_pcm_runtime *be, int stream)
{
	struct snd_soc_dpcm *dpcm;
	struct snd_pcm_substream *fe_substream, *be_substream;

	/* reparent if BE is connected to other FEs */
	if (!be->dpcm[stream].users)
		return;

	be_substream = snd_soc_dpcm_get_substream(be, stream);

	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
		if (dpcm->fe == fe)
			continue;

		dev_dbg(fe->dev, "  reparent %s path %s %s %s\n",
			stream ? "capture" : "playback",
			dpcm->fe->dai_link->name,
			stream ? "<-" : "->", dpcm->be->dai_link->name);

		fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
		be_substream->runtime = fe_substream->runtime;
		break;
	}
}

/* disconnect a BE and FE */
static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
{
	struct snd_soc_dpcm *dpcm, *d;

	list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
		dev_dbg(fe->dev, "BE %s disconnect check for %s\n",
				stream ? "capture" : "playback",
				dpcm->be->dai_link->name);

		if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
			continue;

		dev_dbg(fe->dev, "  freed DSP %s path %s %s %s\n",
			stream ? "capture" : "playback", fe->dai_link->name,
			stream ? "<-" : "->", dpcm->be->dai_link->name);

		/* BEs still alive need new FE */
		dpcm_be_reparent(fe, dpcm->be, stream);

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#ifdef CONFIG_DEBUG_FS
		debugfs_remove(dpcm->debugfs_state);
#endif
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		list_del(&dpcm->list_be);
		list_del(&dpcm->list_fe);
		kfree(dpcm);
	}
}

/* get BE for DAI widget and stream */
static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
		struct snd_soc_dapm_widget *widget, int stream)
{
	struct snd_soc_pcm_runtime *be;
	int i;

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		for (i = 0; i < card->num_links; i++) {
			be = &card->rtd[i];

			if (be->cpu_dai->playback_widget == widget ||
				be->codec_dai->playback_widget == widget)
				return be;
		}
	} else {

		for (i = 0; i < card->num_links; i++) {
			be = &card->rtd[i];

			if (be->cpu_dai->capture_widget == widget ||
				be->codec_dai->capture_widget == widget)
				return be;
		}
	}

	dev_err(card->dev, "can't get %s BE for %s\n",
		stream ? "capture" : "playback", widget->name);
	return NULL;
}

static inline struct snd_soc_dapm_widget *
	rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
{
	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		return rtd->cpu_dai->playback_widget;
	else
		return rtd->cpu_dai->capture_widget;
}

static inline struct snd_soc_dapm_widget *
	rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
{
	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		return rtd->codec_dai->playback_widget;
	else
		return rtd->codec_dai->capture_widget;
}

static int widget_in_list(struct snd_soc_dapm_widget_list *list,
		struct snd_soc_dapm_widget *widget)
{
	int i;

	for (i = 0; i < list->num_widgets; i++) {
		if (widget == list->widgets[i])
			return 1;
	}

	return 0;
}

static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
	int stream, struct snd_soc_dapm_widget_list **list_)
{
	struct snd_soc_dai *cpu_dai = fe->cpu_dai;
	struct snd_soc_dapm_widget_list *list;
	int paths;

	list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
			sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
	if (list == NULL)
		return -ENOMEM;

	/* get number of valid DAI paths and their widgets */
	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);

	dev_dbg(fe->dev, "found %d audio %s paths\n", paths,
			stream ? "capture" : "playback");

	*list_ = list;
	return paths;
}

static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
{
	kfree(*list);
}

static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
	struct snd_soc_dapm_widget_list **list_)
{
	struct snd_soc_dpcm *dpcm;
	struct snd_soc_dapm_widget_list *list = *list_;
	struct snd_soc_dapm_widget *widget;
	int prune = 0;

	/* Destroy any old FE <--> BE connections */
	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		/* is there a valid CPU DAI widget for this BE */
		widget = rtd_get_cpu_widget(dpcm->be, stream);

		/* prune the BE if it's no longer in our active list */
		if (widget && widget_in_list(list, widget))
			continue;

		/* is there a valid CODEC DAI widget for this BE */
		widget = rtd_get_codec_widget(dpcm->be, stream);

		/* prune the BE if it's no longer in our active list */
		if (widget && widget_in_list(list, widget))
			continue;

		dev_dbg(fe->dev, "pruning %s BE %s for %s\n",
			stream ? "capture" : "playback",
			dpcm->be->dai_link->name, fe->dai_link->name);
		dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
		dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
		prune++;
	}

	dev_dbg(fe->dev, "found %d old BE paths for pruning\n", prune);
	return prune;
}

static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
	struct snd_soc_dapm_widget_list **list_)
{
	struct snd_soc_card *card = fe->card;
	struct snd_soc_dapm_widget_list *list = *list_;
	struct snd_soc_pcm_runtime *be;
	int i, new = 0, err;

	/* Create any new FE <--> BE connections */
	for (i = 0; i < list->num_widgets; i++) {

		if (list->widgets[i]->id != snd_soc_dapm_dai)
			continue;

		/* is there a valid BE rtd for this widget */
		be = dpcm_get_be(card, list->widgets[i], stream);
		if (!be) {
			dev_err(fe->dev, "no BE found for %s\n",
					list->widgets[i]->name);
			continue;
		}

		/* make sure BE is a real BE */
		if (!be->dai_link->no_pcm)
			continue;

		/* don't connect if FE is not running */
		if (!fe->dpcm[stream].runtime)
			continue;

		/* newly connected FE and BE */
		err = dpcm_be_connect(fe, be, stream);
		if (err < 0) {
			dev_err(fe->dev, "can't connect %s\n",
				list->widgets[i]->name);
			break;
		} else if (err == 0) /* already connected */
			continue;

		/* new */
		be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
		new++;
	}

	dev_dbg(fe->dev, "found %d new BE paths\n", new);
	return new;
}

/*
 * Find the corresponding BE DAIs that source or sink audio to this
 * FE substream.
 */
static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
	int stream, struct snd_soc_dapm_widget_list **list, int new)
{
	if (new)
		return dpcm_add_paths(fe, stream, list);
	else
		return dpcm_prune_paths(fe, stream, list);
}

static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
{
	struct snd_soc_dpcm *dpcm;

	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
		dpcm->be->dpcm[stream].runtime_update =
						SND_SOC_DPCM_UPDATE_NO;
}

static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
	int stream)
{
	struct snd_soc_dpcm *dpcm;

	/* disable any enabled and non active backends */
	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		if (be->dpcm[stream].users == 0)
			dev_err(be->dev, "no users %s at close - state %d\n",
				stream ? "capture" : "playback",
				be->dpcm[stream].state);

		if (--be->dpcm[stream].users != 0)
			continue;

		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
			continue;

		soc_pcm_close(be_substream);
		be_substream->runtime = NULL;
		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
	}
}

static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
{
	struct snd_soc_dpcm *dpcm;
	int err, count = 0;

	/* only startup BE DAIs that are either sinks or sources to this FE DAI */
	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		/* is this op for this BE ? */
		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		/* first time the dpcm is open ? */
		if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
			dev_err(be->dev, "too many users %s at open %d\n",
				stream ? "capture" : "playback",
				be->dpcm[stream].state);

		if (be->dpcm[stream].users++ != 0)
			continue;

		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
			continue;

		dev_dbg(be->dev, "dpcm: open BE %s\n", be->dai_link->name);

		be_substream->runtime = be->dpcm[stream].runtime;
		err = soc_pcm_open(be_substream);
		if (err < 0) {
			dev_err(be->dev, "BE open failed %d\n", err);
			be->dpcm[stream].users--;
			if (be->dpcm[stream].users < 0)
				dev_err(be->dev, "no users %s at unwind %d\n",
					stream ? "capture" : "playback",
					be->dpcm[stream].state);

			be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
			goto unwind;
		}

		be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
		count++;
	}

	return count;

unwind:
	/* disable any enabled and non active backends */
	list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		if (be->dpcm[stream].users == 0)
			dev_err(be->dev, "no users %s at close %d\n",
				stream ? "capture" : "playback",
				be->dpcm[stream].state);

		if (--be->dpcm[stream].users != 0)
			continue;

		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
			continue;

		soc_pcm_close(be_substream);
		be_substream->runtime = NULL;
		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
	}

	return err;
}

1091
static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
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{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
		runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
		runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
		runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
		runtime->hw.formats &= cpu_dai_drv->playback.formats;
		runtime->hw.rates = cpu_dai_drv->playback.rates;
	} else {
		runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
		runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
		runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
		runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
		runtime->hw.formats &= cpu_dai_drv->capture.formats;
		runtime->hw.rates = cpu_dai_drv->capture.rates;
	}
}

static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
{
	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
	struct snd_pcm_runtime *runtime = fe_substream->runtime;
	int stream = fe_substream->stream, ret = 0;

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

	ret = dpcm_be_dai_startup(fe, fe_substream->stream);
	if (ret < 0) {
		dev_err(fe->dev,"dpcm: failed to start some BEs %d\n", ret);
		goto be_err;
	}

	dev_dbg(fe->dev, "dpcm: open FE %s\n", fe->dai_link->name);

	/* start the DAI frontend */
	ret = soc_pcm_open(fe_substream);
	if (ret < 0) {
		dev_err(fe->dev,"dpcm: failed to start FE %d\n", ret);
		goto unwind;
	}

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

	dpcm_set_fe_runtime(fe_substream);
	snd_pcm_limit_hw_rates(runtime);

	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
	return 0;

unwind:
	dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
be_err:
	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
	return ret;
}

static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
{
	struct snd_soc_dpcm *dpcm;

	/* only shutdown BEs that are either sinks or sources to this FE DAI */
	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		/* is this op for this BE ? */
		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		if (be->dpcm[stream].users == 0)
			dev_err(be->dev, "no users %s at close - state %d\n",
				stream ? "capture" : "playback",
				be->dpcm[stream].state);

		if (--be->dpcm[stream].users != 0)
			continue;

		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
			continue;

		dev_dbg(be->dev, "dpcm: close BE %s\n",
			dpcm->fe->dai_link->name);

		soc_pcm_close(be_substream);
		be_substream->runtime = NULL;

		be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
	}
	return 0;
}

static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *fe = substream->private_data;
	int stream = substream->stream;

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

	/* shutdown the BEs */
	dpcm_be_dai_shutdown(fe, substream->stream);

	dev_dbg(fe->dev, "dpcm: close FE %s\n", fe->dai_link->name);

	/* now shutdown the frontend */
	soc_pcm_close(substream);

	/* run the stream event for each BE */
	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;
	return 0;
}

static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
{
	struct snd_soc_dpcm *dpcm;

	/* only hw_params backends that are either sinks or sources
	 * to this frontend DAI */
	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		/* is this op for this BE ? */
		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		/* only free hw when no longer used - check all FEs */
		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
				continue;

		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
			continue;

		dev_dbg(be->dev, "dpcm: hw_free BE %s\n",
			dpcm->fe->dai_link->name);

		soc_pcm_hw_free(be_substream);

		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
	}

	return 0;
}

1251
static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
{
	struct snd_soc_pcm_runtime *fe = substream->private_data;
	int err, stream = substream->stream;

	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;

	dev_dbg(fe->dev, "dpcm: hw_free FE %s\n", fe->dai_link->name);

	/* call hw_free on the frontend */
	err = soc_pcm_hw_free(substream);
	if (err < 0)
		dev_err(fe->dev,"dpcm: hw_free FE %s failed\n",
			fe->dai_link->name);

	/* only hw_params backends that are either sinks or sources
	 * to this frontend DAI */
	err = dpcm_be_dai_hw_free(fe, stream);

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

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

static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
{
	struct snd_soc_dpcm *dpcm;
	int ret;

	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		/* is this op for this BE ? */
		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		/* only allow hw_params() if no connected FEs are running */
		if (!snd_soc_dpcm_can_be_params(fe, be, stream))
			continue;

		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
			continue;

		dev_dbg(be->dev, "dpcm: hw_params BE %s\n",
			dpcm->fe->dai_link->name);

		/* copy params for each dpcm */
		memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
				sizeof(struct snd_pcm_hw_params));

		/* perform any hw_params fixups */
		if (be->dai_link->be_hw_params_fixup) {
			ret = be->dai_link->be_hw_params_fixup(be,
					&dpcm->hw_params);
			if (ret < 0) {
				dev_err(be->dev,
					"dpcm: hw_params BE fixup failed %d\n",
					ret);
				goto unwind;
			}
		}

		ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
		if (ret < 0) {
			dev_err(dpcm->be->dev,
				"dpcm: hw_params BE failed %d\n", ret);
			goto unwind;
		}

		be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
	}
	return 0;

unwind:
	/* disable any enabled and non active backends */
	list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		/* only allow hw_free() if no connected FEs are running */
		if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
			continue;

		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
		   (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
			continue;

		soc_pcm_hw_free(be_substream);
	}

	return ret;
}

1358 1359
static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params)
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
{
	struct snd_soc_pcm_runtime *fe = substream->private_data;
	int ret, stream = substream->stream;

	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;

	memcpy(&fe->dpcm[substream->stream].hw_params, params,
			sizeof(struct snd_pcm_hw_params));
	ret = dpcm_be_dai_hw_params(fe, substream->stream);
	if (ret < 0) {
		dev_err(fe->dev,"dpcm: hw_params BE failed %d\n", ret);
		goto out;
	}

	dev_dbg(fe->dev, "dpcm: hw_params FE %s rate %d chan %x fmt %d\n",
			fe->dai_link->name, params_rate(params),
			params_channels(params), params_format(params));

	/* call hw_params on the frontend */
	ret = soc_pcm_hw_params(substream, params);
	if (ret < 0) {
		dev_err(fe->dev,"dpcm: hw_params FE failed %d\n", ret);
		dpcm_be_dai_hw_free(fe, stream);
	 } else
		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;

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

static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
		struct snd_pcm_substream *substream, int cmd)
{
	int ret;

	dev_dbg(dpcm->be->dev, "dpcm: trigger BE %s cmd %d\n",
			dpcm->fe->dai_link->name, cmd);

	ret = soc_pcm_trigger(substream, cmd);
	if (ret < 0)
		dev_err(dpcm->be->dev,"dpcm: trigger BE failed %d\n", ret);

	return ret;
}

1408 1409
static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
			       int cmd)
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
{
	struct snd_soc_dpcm *dpcm;
	int ret = 0;

	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		/* is this op for this BE ? */
		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
			    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
				continue;

			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
			if (ret)
				return ret;

			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
			break;
		case SNDRV_PCM_TRIGGER_RESUME:
			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
				continue;

			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
			if (ret)
				return ret;

			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
			break;
		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
			if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
				continue;

			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
			if (ret)
				return ret;

			be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
			break;
		case SNDRV_PCM_TRIGGER_STOP:
			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
				continue;

			if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
				continue;

			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
			if (ret)
				return ret;

			be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
			break;
		case SNDRV_PCM_TRIGGER_SUSPEND:
			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
				continue;

			if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
				continue;

			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
			if (ret)
				return ret;

			be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
			break;
		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
			if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
				continue;

			if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
				continue;

			ret = dpcm_do_trigger(dpcm, be_substream, cmd);
			if (ret)
				return ret;

			be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
			break;
		}
	}

	return ret;
}
EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);

1502
static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
{
	struct snd_soc_pcm_runtime *fe = substream->private_data;
	int stream = substream->stream, ret;
	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];

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

	switch (trigger) {
	case SND_SOC_DPCM_TRIGGER_PRE:
		/* call trigger on the frontend before the backend. */

		dev_dbg(fe->dev, "dpcm: pre trigger FE %s cmd %d\n",
				fe->dai_link->name, cmd);

		ret = soc_pcm_trigger(substream, cmd);
		if (ret < 0) {
			dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
			goto out;
		}

		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
		break;
	case SND_SOC_DPCM_TRIGGER_POST:
		/* call trigger on the frontend after the backend. */

		ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
		if (ret < 0) {
			dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
			goto out;
		}

		dev_dbg(fe->dev, "dpcm: post trigger FE %s cmd %d\n",
				fe->dai_link->name, cmd);

		ret = soc_pcm_trigger(substream, cmd);
		break;
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550
	case SND_SOC_DPCM_TRIGGER_BESPOKE:
		/* bespoke trigger() - handles both FE and BEs */

		dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd %d\n",
				fe->dai_link->name, cmd);

		ret = soc_pcm_bespoke_trigger(substream, cmd);
		if (ret < 0) {
			dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
			goto out;
		}
		break;
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
	default:
		dev_err(fe->dev, "dpcm: invalid trigger cmd %d for %s\n", cmd,
				fe->dai_link->name);
		ret = -EINVAL;
		goto out;
	}

	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:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
		break;
	}

out:
	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
	return ret;
}

static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
{
	struct snd_soc_dpcm *dpcm;
	int ret = 0;

	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *be_substream =
			snd_soc_dpcm_get_substream(be, stream);

		/* is this op for this BE ? */
		if (!snd_soc_dpcm_be_can_update(fe, be, stream))
			continue;

		if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
		    (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
			continue;

		dev_dbg(be->dev, "dpcm: prepare BE %s\n",
			dpcm->fe->dai_link->name);

		ret = soc_pcm_prepare(be_substream);
		if (ret < 0) {
			dev_err(be->dev, "dpcm: backend prepare failed %d\n",
				ret);
			break;
		}

		be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
	}
	return ret;
}

1610
static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
{
	struct snd_soc_pcm_runtime *fe = substream->private_data;
	int stream = substream->stream, ret = 0;

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

	dev_dbg(fe->dev, "dpcm: prepare FE %s\n", fe->dai_link->name);

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

	/* there is no point preparing this FE if there are no BEs */
	if (list_empty(&fe->dpcm[stream].be_clients)) {
		dev_err(fe->dev, "dpcm: no backend DAIs enabled for %s\n",
				fe->dai_link->name);
		ret = -EINVAL;
		goto out;
	}

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

	/* call prepare on the frontend */
	ret = soc_pcm_prepare(substream);
	if (ret < 0) {
		dev_err(fe->dev,"dpcm: prepare FE %s failed\n",
			fe->dai_link->name);
		goto out;
	}

	/* run the stream event for each BE */
	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;
}

1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
static int soc_pcm_ioctl(struct snd_pcm_substream *substream,
		     unsigned int cmd, void *arg)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_platform *platform = rtd->platform;

	if (platform->driver->ops->ioctl)
		return platform->driver->ops->ioctl(substream, cmd, arg);
	return snd_pcm_lib_ioctl(substream, cmd, arg);
}

1663 1664
static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
{
1665 1666 1667
	struct snd_pcm_substream *substream =
		snd_soc_dpcm_get_substream(fe, stream);
	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1668 1669 1670 1671 1672
	int err;

	dev_dbg(fe->dev, "runtime %s close on FE %s\n",
			stream ? "capture" : "playback", fe->dai_link->name);

1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
		/* call bespoke trigger - FE takes care of all BE triggers */
		dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd stop\n",
				fe->dai_link->name);

		err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
		if (err < 0)
			dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
	} else {
		dev_dbg(fe->dev, "dpcm: trigger FE %s cmd stop\n",
			fe->dai_link->name);

		err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
		if (err < 0)
			dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
	}
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705

	err = dpcm_be_dai_hw_free(fe, stream);
	if (err < 0)
		dev_err(fe->dev,"dpcm: hw_free FE failed %d\n", err);

	err = dpcm_be_dai_shutdown(fe, stream);
	if (err < 0)
		dev_err(fe->dev,"dpcm: shutdown FE failed %d\n", err);

	/* run the stream event for each BE */
	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);

	return 0;
}

static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
{
1706 1707
	struct snd_pcm_substream *substream =
		snd_soc_dpcm_get_substream(fe, stream);
1708
	struct snd_soc_dpcm *dpcm;
1709
	enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
	int ret;

	dev_dbg(fe->dev, "runtime %s open on FE %s\n",
			stream ? "capture" : "playback", fe->dai_link->name);

	/* Only start the BE if the FE is ready */
	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE)
		return -EINVAL;

	/* startup must always be called for new BEs */
	ret = dpcm_be_dai_startup(fe, stream);
	if (ret < 0) {
		goto disconnect;
		return ret;
	}

	/* keep going if FE state is > open */
	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
		return 0;
1730

1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
	ret = dpcm_be_dai_hw_params(fe, stream);
	if (ret < 0) {
		goto close;
		return ret;
	}

	/* keep going if FE state is > hw_params */
	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
		return 0;


	ret = dpcm_be_dai_prepare(fe, stream);
	if (ret < 0) {
		goto hw_free;
		return ret;
	}

	/* run the stream event for each BE */
	dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);

	/* keep going if FE state is > prepare */
	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
		fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
		return 0;

1756 1757 1758 1759
	if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
		/* call trigger on the frontend - FE takes care of all BE triggers */
		dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd start\n",
				fe->dai_link->name);
1760

1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
		ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
		if (ret < 0) {
			dev_err(fe->dev,"dpcm: bespoke trigger FE failed %d\n", ret);
			goto hw_free;
		}
	} else {
		dev_dbg(fe->dev, "dpcm: trigger FE %s cmd start\n",
			fe->dai_link->name);

		ret = dpcm_be_dai_trigger(fe, stream,
					SNDRV_PCM_TRIGGER_START);
		if (ret < 0) {
			dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
			goto hw_free;
		}
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915
	}

	return 0;

hw_free:
	dpcm_be_dai_hw_free(fe, stream);
close:
	dpcm_be_dai_shutdown(fe, stream);
disconnect:
	/* disconnect any non started BEs */
	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
		struct snd_soc_pcm_runtime *be = dpcm->be;
		if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
				dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
	}

	return ret;
}

static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
{
	int ret;

	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
	ret = dpcm_run_update_startup(fe, stream);
	if (ret < 0)
		dev_err(fe->dev, "failed to startup some BEs\n");
	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;

	return ret;
}

static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
{
	int ret;

	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
	ret = dpcm_run_update_shutdown(fe, stream);
	if (ret < 0)
		dev_err(fe->dev, "failed to shutdown some BEs\n");
	fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;

	return ret;
}

/* Called by DAPM mixer/mux changes to update audio routing between PCMs and
 * any DAI links.
 */
int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
{
	struct snd_soc_card *card;
	int i, old, new, paths;

	if (widget->codec)
		card = widget->codec->card;
	else if (widget->platform)
		card = widget->platform->card;
	else
		return -EINVAL;

	mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
	for (i = 0; i < card->num_rtd; i++) {
		struct snd_soc_dapm_widget_list *list;
		struct snd_soc_pcm_runtime *fe = &card->rtd[i];

		/* make sure link is FE */
		if (!fe->dai_link->dynamic)
			continue;

		/* only check active links */
		if (!fe->cpu_dai->active)
			continue;

		/* DAPM sync will call this to update DSP paths */
		dev_dbg(fe->dev, "DPCM runtime update for FE %s\n",
			fe->dai_link->name);

		/* skip if FE doesn't have playback capability */
		if (!fe->cpu_dai->driver->playback.channels_min)
			goto capture;

		paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
		if (paths < 0) {
			dev_warn(fe->dev, "%s no valid %s path\n",
					fe->dai_link->name,  "playback");
			mutex_unlock(&card->mutex);
			return paths;
		}

		/* update any new playback paths */
		new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
		if (new) {
			dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
		}

		/* update any old playback paths */
		old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
		if (old) {
			dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
		}

capture:
		/* skip if FE doesn't have capture capability */
		if (!fe->cpu_dai->driver->capture.channels_min)
			continue;

		paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
		if (paths < 0) {
			dev_warn(fe->dev, "%s no valid %s path\n",
					fe->dai_link->name,  "capture");
			mutex_unlock(&card->mutex);
			return paths;
		}

		/* update any new capture paths */
		new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
		if (new) {
			dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
		}

		/* update any old capture paths */
		old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
		if (old) {
			dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
			dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
			dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
		}

		dpcm_path_put(&list);
	}

	mutex_unlock(&card->mutex);
	return 0;
}
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
{
	struct snd_soc_dpcm *dpcm;
	struct list_head *clients =
		&fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;

	list_for_each_entry(dpcm, clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_soc_dai *dai = be->codec_dai;
		struct snd_soc_dai_driver *drv = dai->driver;

		if (be->dai_link->ignore_suspend)
			continue;

		dev_dbg(be->dev, "BE digital mute %s\n", be->dai_link->name);

		if (drv->ops->digital_mute && dai->playback_active)
				drv->ops->digital_mute(dai, mute);
	}

	return 0;
}

1940
static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
{
	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
	struct snd_soc_dpcm *dpcm;
	struct snd_soc_dapm_widget_list *list;
	int ret;
	int stream = fe_substream->stream;

	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
	fe->dpcm[stream].runtime = fe_substream->runtime;

	if (dpcm_path_get(fe, stream, &list) <= 0) {
		dev_warn(fe->dev, "asoc: %s no valid %s route\n",
			fe->dai_link->name, stream ? "capture" : "playback");
			mutex_unlock(&fe->card->mutex);
			return -EINVAL;
	}

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

	ret = dpcm_fe_dai_startup(fe_substream);
	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;
	}

	dpcm_clear_pending_state(fe, stream);
	dpcm_path_put(&list);
	mutex_unlock(&fe->card->mutex);
	return ret;
}

1977
static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
{
	struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
	struct snd_soc_dpcm *dpcm;
	int stream = fe_substream->stream, ret;

	mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
	ret = dpcm_fe_dai_shutdown(fe_substream);

	/* 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_be_disconnect(fe, stream);

	fe->dpcm[stream].runtime = NULL;
	mutex_unlock(&fe->card->mutex);
	return ret;
}

1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
/* create a new pcm */
int soc_new_pcm(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_pcm *pcm;
	char new_name[64];
	int ret = 0, playback = 0, capture = 0;

2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037
	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
		if (cpu_dai->driver->playback.channels_min)
			playback = 1;
		if (cpu_dai->driver->capture.channels_min)
			capture = 1;
	} else {
		if (codec_dai->driver->playback.channels_min)
			playback = 1;
		if (codec_dai->driver->capture.channels_min)
			capture = 1;
	}

	/* create the PCM */
	if (rtd->dai_link->no_pcm) {
		snprintf(new_name, sizeof(new_name), "(%s)",
			rtd->dai_link->stream_name);

		ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
				playback, capture, &pcm);
	} else {
		if (rtd->dai_link->dynamic)
			snprintf(new_name, sizeof(new_name), "%s (*)",
				rtd->dai_link->stream_name);
		else
			snprintf(new_name, sizeof(new_name), "%s %s-%d",
				rtd->dai_link->stream_name, codec_dai->name, num);

		ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
			capture, &pcm);
	}
2038 2039 2040 2041
	if (ret < 0) {
		printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
		return ret;
	}
2042
	dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num, new_name);
2043 2044 2045 2046 2047 2048

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

	rtd->pcm = pcm;
	pcm->private_data = rtd;
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066

	if (rtd->dai_link->no_pcm) {
		if (playback)
			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
		if (capture)
			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
		goto out;
	}

	/* ASoC PCM operations */
	if (rtd->dai_link->dynamic) {
		rtd->ops.open		= dpcm_fe_dai_open;
		rtd->ops.hw_params	= dpcm_fe_dai_hw_params;
		rtd->ops.prepare	= dpcm_fe_dai_prepare;
		rtd->ops.trigger	= dpcm_fe_dai_trigger;
		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;
		rtd->ops.close		= dpcm_fe_dai_close;
		rtd->ops.pointer	= soc_pcm_pointer;
2067
		rtd->ops.ioctl		= soc_pcm_ioctl;
2068 2069 2070 2071 2072 2073 2074 2075
	} else {
		rtd->ops.open		= soc_pcm_open;
		rtd->ops.hw_params	= soc_pcm_hw_params;
		rtd->ops.prepare	= soc_pcm_prepare;
		rtd->ops.trigger	= soc_pcm_trigger;
		rtd->ops.hw_free	= soc_pcm_hw_free;
		rtd->ops.close		= soc_pcm_close;
		rtd->ops.pointer	= soc_pcm_pointer;
2076
		rtd->ops.ioctl		= soc_pcm_ioctl;
2077 2078
	}

2079
	if (platform->driver->ops) {
2080 2081 2082 2083 2084
		rtd->ops.ack		= platform->driver->ops->ack;
		rtd->ops.copy		= platform->driver->ops->copy;
		rtd->ops.silence	= platform->driver->ops->silence;
		rtd->ops.page		= platform->driver->ops->page;
		rtd->ops.mmap		= platform->driver->ops->mmap;
2085 2086 2087
	}

	if (playback)
2088
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
2089 2090

	if (capture)
2091
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101

	if (platform->driver->pcm_new) {
		ret = platform->driver->pcm_new(rtd);
		if (ret < 0) {
			pr_err("asoc: platform pcm constructor failed\n");
			return ret;
		}
	}

	pcm->private_free = platform->driver->pcm_free;
2102
out:
2103 2104 2105 2106
	printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
		cpu_dai->name);
	return ret;
}
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206

/* is the current PCM operation for this FE ? */
int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
{
	if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
		return 1;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);

/* is the current PCM operation for this BE ? */
int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
		struct snd_soc_pcm_runtime *be, int stream)
{
	if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
	   ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
		  be->dpcm[stream].runtime_update))
		return 1;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);

/* get the substream for this BE */
struct snd_pcm_substream *
	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
{
	return be->pcm->streams[stream].substream;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);

/* get the BE runtime state */
enum snd_soc_dpcm_state
	snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
{
	return be->dpcm[stream].state;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);

/* set the BE runtime state */
void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
		int stream, enum snd_soc_dpcm_state state)
{
	be->dpcm[stream].state = state;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);

/*
 * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
 * are not running, paused or suspended for the specified stream direction.
 */
int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
		struct snd_soc_pcm_runtime *be, int stream)
{
	struct snd_soc_dpcm *dpcm;
	int state;

	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {

		if (dpcm->fe == fe)
			continue;

		state = dpcm->fe->dpcm[stream].state;
		if (state == SND_SOC_DPCM_STATE_START ||
			state == SND_SOC_DPCM_STATE_PAUSED ||
			state == SND_SOC_DPCM_STATE_SUSPEND)
			return 0;
	}

	/* it's safe to free/stop this BE DAI */
	return 1;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);

/*
 * We can only change hw params a BE DAI if any of it's FE are not prepared,
 * running, paused or suspended for the specified stream direction.
 */
int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
		struct snd_soc_pcm_runtime *be, int stream)
{
	struct snd_soc_dpcm *dpcm;
	int state;

	list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {

		if (dpcm->fe == fe)
			continue;

		state = dpcm->fe->dpcm[stream].state;
		if (state == SND_SOC_DPCM_STATE_START ||
			state == SND_SOC_DPCM_STATE_PAUSED ||
			state == SND_SOC_DPCM_STATE_SUSPEND ||
			state == SND_SOC_DPCM_STATE_PREPARE)
			return 0;
	}

	/* it's safe to change hw_params */
	return 1;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
2207

2208 2209 2210 2211 2212 2213 2214 2215 2216
int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
		int cmd, struct snd_soc_platform *platform)
{
	if (platform->driver->ops->trigger)
		return platform->driver->ops->trigger(substream, cmd);
	return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);

2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322
#ifdef CONFIG_DEBUG_FS
static char *dpcm_state_string(enum snd_soc_dpcm_state state)
{
	switch (state) {
	case SND_SOC_DPCM_STATE_NEW:
		return "new";
	case SND_SOC_DPCM_STATE_OPEN:
		return "open";
	case SND_SOC_DPCM_STATE_HW_PARAMS:
		return "hw_params";
	case SND_SOC_DPCM_STATE_PREPARE:
		return "prepare";
	case SND_SOC_DPCM_STATE_START:
		return "start";
	case SND_SOC_DPCM_STATE_STOP:
		return "stop";
	case SND_SOC_DPCM_STATE_SUSPEND:
		return "suspend";
	case SND_SOC_DPCM_STATE_PAUSED:
		return "paused";
	case SND_SOC_DPCM_STATE_HW_FREE:
		return "hw_free";
	case SND_SOC_DPCM_STATE_CLOSE:
		return "close";
	}

	return "unknown";
}

static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
				int stream, char *buf, size_t size)
{
	struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
	struct snd_soc_dpcm *dpcm;
	ssize_t offset = 0;

	/* FE state */
	offset += snprintf(buf + offset, size - offset,
			"[%s - %s]\n", fe->dai_link->name,
			stream ? "Capture" : "Playback");

	offset += snprintf(buf + offset, size - offset, "State: %s\n",
	                dpcm_state_string(fe->dpcm[stream].state));

	if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
	    (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
		offset += snprintf(buf + offset, size - offset,
				"Hardware Params: "
				"Format = %s, Channels = %d, Rate = %d\n",
				snd_pcm_format_name(params_format(params)),
				params_channels(params),
				params_rate(params));

	/* BEs state */
	offset += snprintf(buf + offset, size - offset, "Backends:\n");

	if (list_empty(&fe->dpcm[stream].be_clients)) {
		offset += snprintf(buf + offset, size - offset,
				" No active DSP links\n");
		goto out;
	}

	list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
		struct snd_soc_pcm_runtime *be = dpcm->be;
		params = &dpcm->hw_params;

		offset += snprintf(buf + offset, size - offset,
				"- %s\n", be->dai_link->name);

		offset += snprintf(buf + offset, size - offset,
				"   State: %s\n",
				dpcm_state_string(be->dpcm[stream].state));

		if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
		    (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
			offset += snprintf(buf + offset, size - offset,
				"   Hardware Params: "
				"Format = %s, Channels = %d, Rate = %d\n",
				snd_pcm_format_name(params_format(params)),
				params_channels(params),
				params_rate(params));
	}

out:
	return offset;
}

static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
				size_t count, loff_t *ppos)
{
	struct snd_soc_pcm_runtime *fe = file->private_data;
	ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
	char *buf;

	buf = kmalloc(out_count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	if (fe->cpu_dai->driver->playback.channels_min)
		offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
					buf + offset, out_count - offset);

	if (fe->cpu_dai->driver->capture.channels_min)
		offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
					buf + offset, out_count - offset);

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	ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
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	kfree(buf);
	return ret;
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}

static const struct file_operations dpcm_state_fops = {
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	.open = simple_open,
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	.read = dpcm_state_read_file,
	.llseek = default_llseek,
};

int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
{
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	if (!rtd->dai_link)
		return 0;

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	rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
			rtd->card->debugfs_card_root);
	if (!rtd->debugfs_dpcm_root) {
		dev_dbg(rtd->dev,
			 "ASoC: Failed to create dpcm debugfs directory %s\n",
			 rtd->dai_link->name);
		return -EINVAL;
	}

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	rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444,
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						rtd->debugfs_dpcm_root,
						rtd, &dpcm_state_fops);

	return 0;
}
#endif